2024-03-28T14:42:25Zhttps://elib.belstu.by/oai/requestoai:elib.belstu.by:123456789/209502020-10-21T09:44:00Zcom_123456789_20513com_123456789_118col_123456789_20518
00925njm 22002777a 4500
dc
Sapon, Ye. G.
author
Martsul, V. N.
author
2015
The management phosphates in freshwater has significant importance to regulate eutrophication. Phosphate excess leads to highly undesirable changes in ecosystems st ructure. The increasing of water body trophicity can result in water quality deterioration. This paper presents the testing results of reactive materials used for phosphorus removal from wastewater at sewage treatment plant. Twelve materi als of different origin available in Belarus were tested as potential reactive material s for phosphates removal. They are natural materials, industrial by-products and manufactured sorbents. Based on chemical composition the available and inexpensive materials rich in Al, Fe, Mg and Ca were selected. Relationship between purification degree of phosphates and specific material consumption (mg/mg PO[4]{3–} ) was investigated to choose potential reactive materials for phosphorus. Four materials (wa-ter conditioning sludge (WCS), dead-catalyst of petroleum hydrocarbon cracking (DCC), electric arc furnace slug (EAF-slug), dolomite burnt at 700°C) have been chosen for detailed sorption tests. WCS, DCC, EAF-slug and burnt dolomite have the apparent sorption capacities of: 13.6; 21.2; 35.3; 70.8 mg PO[4]{3-}/g respectively. Results have shown that the raw natura l materials (chalk, clay, dolomite and tripoli powder) and wastewater electric coagulation treatment sludge are of low efficiency. Results for experiments with synthetic solutions of phosphates are in correlation with results for actual wastewaters.
Sapon, Ye. G. Phosphates purification of waste water by natural materials and industrial wastes (comparative study) / Ye. G. Sapon, V. N. Martsul // Proceedings of BSTU. No. 3. – Minsk : BSTU, 2015. – P. 17-23
https://elib.belstu.by/handle/123456789/20950
628.316:54:544.72
очистка сточных вод
растворы фосфатов
удаление фосфатов
термическая обработка
доломит
шлам водоподготовки
электросталеплавильный шлак
отработанные катализаторы
Phosphates purification of waste water by natural materials and industrial wastes (comparative study)
oai:elib.belstu.by:123456789/209322020-10-21T09:44:00Zcom_123456789_20513com_123456789_118col_123456789_20518
00925njm 22002777a 4500
dc
Matys, V. G.
author
Poplavsky, V. V.
author
2015
The aim of this work is comparison of corrosion resistance of aluminum and its alloy D16 to galvanic corrosion in couples with carbon steel A284 and stainless steel type 321, on the surface of which various metallic coatings were deposited. Zinc, cad mium and aluminum used as the metal coatings on the steel. Coatings deposited by electroplating and vacuum ion-beam assisted deposition. Study of galvanic coupling of deposited coatings with aluminum and its alloy carried out by electrochemical methods in a 3% NaCl solution. Zinc and cadmium coatings on steel, formed by both methods, have electrochemical characteristics of deposited metals. Zinc coatings in galvanic couples with aluminum and its alloy are anodes and aluminum coatings are cathodes. Compromise potentials of cadmium coatings approximately coincide with those for aluminum and its alloy. Current density of the galvanic corrosion of aluminum and its alloy in galvanic couples with steel with-out coatings was ~10{–2}mA/cm{2}, and in galvanic couples with aluminum coatings on steel – ~10{–3}mA/cm{2}. Corrosion current density of zinc in coatings was 2 ⋅ 10{–2}mA/cm{2}, and cadmium – 6 ⋅ 10{-3} mA/cm{2}. Best galvanic compatibility with aluminum and its alloy D16 in 3% NaCl have cadmium coatings.
Matys, V. G. Galvanic corrosion resistance of aluminum and its alloy in galvanic couples with steels with metallic coatings / V. G. Matys, V. V. Poplavsky // Proceedings of BSTU. No. 3. – Minsk : BSTU, 2015. – P. 46-51
https://elib.belstu.by/handle/123456789/20932
621.793:620.197
алюминий
алюминиевые сплавы
коррозионная устойчивость
цинковые покрытия
кадмиевые покрытия
сталь углеродистая
сталь нержавеющая
электрохимическое осаждение
контактная коррозия
осаждение кадмия
осаждение цинка
гальваническое осаждение
вакуумное осаждение
компромиссные потенциалы
Galvanic corrosion resistance of aluminum and its alloy in galvanic couples with steels with metallic coatings
oai:elib.belstu.by:123456789/209182020-10-21T09:44:00Zcom_123456789_20513com_123456789_118col_123456789_20518
00925njm 22002777a 4500
dc
Hvesko, G. M.
author
2015
The object of the study is birch wood, impregnated with polyester resin PN-1 and phenolic alcohols. Resin PN-1 is a filler, which do not penetrate the cell walls of wood, and phenolic alcohols, on the contrary, represent a class of fillers, which penetrate the cell walls. The degree of impregnation of wood is estimated by coefficient k. When impregnated with resin PN-1, it is equal to 0.8, when impregnated with phenolic alcohols – 0.2. To study the behavior of modified wood in long-term loading the real body is rep-resented as a set of two environments: perfectly elastic, deformable according to Hooke's law, and vis-cous, which obeys Newton's law. As with natural w ood in the description of creep modified birch wood we use rheological equation of Maxwell − Thomson, otherwise, the law of deformation “typical body”. The study of natural birch wood on base of what the modified wood is obtained is accomplished for the subsequent comparison of the rheological characteristics of these two materials. According to the experimental creep curves are defined instant and long elastic moduli, the relaxation time. Using these rheological characteristics, the coefficients of viscosity and modified natural birch wood are calculated. Rheological characteristics of modified wood appeared higher than those of natural wood.
Hvesko, G. M. Rheological characteristics of modified wood / G. M. Hvesko // Proceedings of BSTU. No. 3. – Minsk : BSTU, 2015. – P. 105-108
https://elib.belstu.by/handle/123456789/20918
674.048
древесина березы
древесина натуральная
древесина модифицированная
деформирование древесины
ползучесть древесины
релаксация древесины
механические свойства древесины
Rheological characteristics of modified wood
oai:elib.belstu.by:123456789/209242020-10-21T09:44:00Zcom_123456789_20513com_123456789_118col_123456789_20518
00925njm 22002777a 4500
dc
Zharskiy, I. M.
author
Kurilo, I. I.
author
Kryshilovich, Ye. V.
author
Kharitonov, D. S.
author
2015
The results of studies of the elemental composition of vanadium-containing industrial waste have been presented. The expediency of its processing due to the profitability of production, the necessity of expanding the raw mate rial base for short supply of vanadium and reducing of nega-tive effects on the environment has been shown. Composition of products extracted from industrial vanadium-containing waste by hydrometallurgical method has been studied. The content of vana-dium are based on V 2 O 5 can reach more than 85 wt %, that meets specifications for this reagent. Solvothermal and sonochemical methods of bism uth vanadate synthesis from obtained vanadi-um (V) oxide have been developed. The phase and elemental composition of synthesized bismuth orthovanadate powders, their size, morphological and coloristic characteristics, physical and chem-ical properties: oil absorption, pH of the aqueous extract, particle size has been studied. It was shown that ultrasonic treatment of a suspension in the synthesis allows to intensify the process in 4–5 times, contributes to obtaining a smooth spherical particle shape, but also leads to an increase in particle size deteriorates powder and several coloristic properties of the pigment. The expedien-cy of using products of vanadium-containing industrial waste treatment for the synthesis of paint pigments BiVO4 has been shown.
Synthesis of pigments using products of vanadium containing industrial waste utilization / I. M. Zharskiy [et al.] // Proceedings of BSTU. No. 3. – Minsk : BSTU, 2015. – P. 73-79
https://elib.belstu.by/handle/123456789/20924
621.357.7
ванадийсодержащие отходы
промышленные отходы
переработка отходов
синтез ванадата висмута
синтез пигментов
лакокрасочные пигменты
соединения ванадия
ванадийсодержащие продукты
синтез ортованадата висмута
Synthesis of pigments using products of vanadium containing industrial waste utilization
oai:elib.belstu.by:123456789/209252020-10-21T09:44:00Zcom_123456789_20513com_123456789_118col_123456789_20518
00925njm 22002777a 4500
dc
Ramanouski, V. I.
author
Likhavitski, V. V.
author
Hurynovich, A. D.
author
2015
The paper presents the dissolution patterns of ozone in the water column height from processing parameters. These studies are necessary to develop new technologies of disinfection of water wells and water supply using ozone. Generally known data of the solubility of ozone in water does not allow to use them for this purpose. The investigations have been carried out on two experimental apparatuses. The following parame-ters as time processing, flow of the gas mixture, the concentration of ozone in the gas mixture, the height of the liquid layer have been studied. Research results for each apparatus are presented in the graphical form of dependences of the con-centrations of residual ozone in water from the sel ected processing parameters. The influence of each variable parameter on residual ozone concentration in the water has been described, and the factors that affect the increase of the concentration of ozone dissolved in water at the height of the first 3 m have also been shown. Such mathematical models describing the dependence of the concentration of ozone in the water from the set parameters as the height of the inser tion point of the gas mixture, the concentration of ozone in the gas mixture, processing time, flow of the gas mixture are presente d. The significance of the regression equations has been checked out.
Ramanouski, V. I. Investigation of ozone solubility in water in height of the liquid / V. I. Ramanouski, V. V. Likhavitski, A. D. Hurynovich // Proceedings of BSTU. No. 3. – Minsk : BSTU, 2015. – P. 68-72
https://elib.belstu.by/handle/123456789/20925
628.162
растворимость озона
обеззараживание воды
концентрация растворенного озона
Investigation of ozone solubility in water in height of the liquid
oai:elib.belstu.by:123456789/209192020-10-21T09:43:59Zcom_123456789_20513com_123456789_118col_123456789_20518
00925njm 22002777a 4500
dc
Levdanskii, E. I.
author
Levdanskii, I. A.
author
2015
The paper studies the problems affecting the degree of extraction of potash ore in the process of its flotation enrichment. It reveals the main directions to improve the process of preparing the ore to flotation. The paper has proposed the construction of a shock-centrifugal mill, in order to improve the quality of ore grinding and has shown the results of its research. A new method of ore desliming prior to flotation as well as the design of the device for its implementation have been presented. The research shows the results of the new classifier studies.
Levdanskii, E. I. Improvement of processes of gribing operation and deslimation of sylvinite ore before flotaton / E. I. Levdanskii, I. A. Levdanskii // Proceedings of BSTU. No. 3. – Minsk : BSTU, 2015. – P. 99-104
https://elib.belstu.by/handle/123456789/20919
621.926
66.065
сильвинитовая руда
измельчение руды
измельчение силвинита
ударно-центробежные мельницы
обесшламливания руды
обогащение сильвинитовых руд
флотация
флотационное обогащение
производство хлористого калия
Improvement of processes of gribing operation and deslimation of sylvinite ore before flotaton
oai:elib.belstu.by:123456789/209302020-10-21T09:44:00Zcom_123456789_20513com_123456789_118col_123456789_20518
00925njm 22002777a 4500
dc
Sokolovskiy, A. Ye.
author
2015
The hydrolysis processes in the system Cr{3+}– Cu{2+} – NO[3]{-} – H[2]O have been investigated by potentiometric titration and dialysis methods. The solutions of the chromium (III) nitrates and copper (II) nitrates obtained by dissolving chromium (III) nitrate and copper in nitric acid were used in the work. The experimental data have been obtained under following conditions: metal ions concentration – 0.01 mol/l, molar ratio Cr{3+}:Cu{2+} = 1:1, ionic strength – 0.3 mol/l (NaNO[3]), temperature – (25 ± 0.1) ° С, pH-range – 1.5–3.6. The results of potentiometric titration do not allow one to establish the possibility of heteropolymeric hydroxocomplexes formation. According to the results obtained by dialysis, polynuclear complexes of cromium (III) in the system Cr{3+}– Cu{2+} – NO[3]{-} – H[2]O are formed when the pH is 2.0. Copper (II) does not forms a polynuclear hydroxocomplexes. The distribution of different Cr(III) and Cu(II) forms upon pH value in the region before formuation of hydroxides sedimenys has been calculated upon experimental data. It was established that Cr (III) and Cu (II) do not form hetero-nuclear hydroxocomplexes.
Sokolovskiy, A. Ye. The hydrocomplexation in the system Cr{3+}– Cu{2+} – NO[3]{-} – H[2]O / A. Ye. Sokolovskiy // Proceedings of BSTU. No. 3. – Minsk : BSTU, 2015. – P. 52-54
https://elib.belstu.by/handle/123456789/20930
541.49:546.763:546.562
гидроксокомплексы
хром
нитрат хрома
медь
гидролиз
потенциометрическое титрование
диализ
The hydrocomplexation in the system Cr{3+}– Cu{2+} – NO[3]{-} – H[2]O
oai:elib.belstu.by:123456789/209202020-10-21T09:43:59Zcom_123456789_20513com_123456789_118col_123456789_20518
00925njm 22002777a 4500
dc
Valodzin, V. I.
author
Kuntysh, V. B.
author
Filatau, S. A.
author
2015
The paper presents the results of simulation of heat pump air-to-air. Numerical design of the main heat exchangers initially performed for a nominal re gime with heating capacity 10.5 kW: evaporator and condenser with heat exchange surface of the minimum weight of the bimetallic finned tubes with fins optimal parameters and restriction to the pressure loss. Obtained the distribution pressure losses in the heat pump circuit by the working substance of the main and auxiliary heat-exchange apparatus. The greatest losses are observed in the evaporator and indicates the maximum permissible. In the following analysis was held of the heat pump in the off-design regimes when the air tempera-ture changes, which was a source of low-grade heat. Based on this analysis reached the following conclusions: – the main influence on the energy perfection of the heat pump is an irreversible losses and outside temperature. Losses in the evaporator are crucial. At low temperatures requires a reserve heat source; – selection of the heat pump must be carried out on the basis of complex comparative analysis and optimal design for each case their use. This approach allows to select a heat pump with the best energy characteristics; – method of analysis of the conjugate heat pump air-to-air can be used with pre-adaptation for other types of heat pumps.
Valodzin, V. I. Energy effectivity of air source heat pump / V. I. Valodzin, V. B. Kuntysh, S. A. Filatau // Proceedings of BSTU. No. 3. – Minsk : BSTU, 2015. – P. 94-98
https://elib.belstu.by/handle/123456789/20920
621.57
тепловые насосы
теплообменные аппараты
теплопроизводительность
энергетическая эффективность
Energy effectivity of air source heat pump
oai:elib.belstu.by:123456789/209332020-10-21T09:44:00Zcom_123456789_20513com_123456789_118col_123456789_20518
00925njm 22002777a 4500
dc
Dormeshkin, O. B.
author
Hauryliuk, A. N.
author
Cherches, G. Kh.
author
2015
The physicochemical laws of the producing of magnesium-containing compound fertilizers based on superphosphate production and ammonium phosphate with the involvement of the Kovdorsky apatite concentrate and various types of magnesium-contai ning raw materials are described. The influence of the main technological parameters and the optimal conditions for combined decomposition of phos-phate raw materials and technical product – dolomite, providing the producing of magnesium-containing fertilizers with specified chemical and physical properties with a content of magnesium (not more than 5 wt %) are determined. New scientific facts about the rheological properties of phosphate suspensions, intermediate and end products, produced at different stages in the suspension of complex magnesium fertilizers based on various types of magnesium containing raw materials are received. It allows the researches to define the optimal conditions and the ways of introduction of magnesium, nitrogen and potassium containing com-ponents in the technological process. The physical and chemical mechanisms are examined. The chemical transformations activity at various stages producing of complex magnesium-containing fertilizers based on magnesium digestion of phosphate raw material and/or dolomite followed by carbamide introduction, gaseous ammonia neutralization, and the addition of magnesium sulfate and potassium chloride is defined. The presented data formed the basis for developing a flexible resource-saving technology of the complex magnesium-containing fertilizers obtainment that provides the diversification possibilities, the obtainment of concentrated long-acting fertilizers with improved physical properties.
Dormeshkin, O. B. Researches of physical and chemical features of processes of complex fertilizers producing in the presence of magnesium containing components / O. B. Dormeshkin, A. N. Hauryliuk, G. Kh. Cherches // Proceedings of BSTU. No. 3. – Minsk : BSTU, 2015. – P. 40-45
https://elib.belstu.by/handle/123456789/20933
661.833
комплексные удобрения
магнийсодержащие удобрения
фосфорнокислые суспензии
разложение фосфатного сырья
производство удобрений
Researches of physical and chemical features of processes of complex fertilizers producing in the presence of magnesium containing components
oai:elib.belstu.by:123456789/209222020-10-21T09:44:00Zcom_123456789_20513com_123456789_118col_123456789_20518
00925njm 22002777a 4500
dc
Andrizhievskiy, A. A.
author
Trifonov, A. G.
author
Kulik, L. S.
author
2015
The modeling analogue of system of passive heat removal from a protective cover is developed within the limits of the formalized templates of COMSOL Multiphysics software package. The method of final elements in COMSOL Multiphysics system interpretation was used for numerical realization of modeling analogue of sistem of passive heat removal from a protective cover.
Andrizhievskiy, A. A. Modeling of passive heat removal system of nuclear power plant containment in thermal convection mode / A. A. Andrizhievskiy, A. G. Trifonov, L. S. Kulik // Proceedings of BSTU. No. 3. – Minsk : BSTU, 2015. – P. 84-88
https://elib.belstu.by/handle/123456789/20922
621.5:519.6
пассивные системы отвода
реакторные установки
защитные оболочки
теплообменные аппараты
имитационное моделирование
численное моделирование
вычислительные шаблоны
Modeling of passive heat removal system of nuclear power plant containment in thermal convection mode
oai:elib.belstu.by:123456789/209422020-10-21T09:44:00Zcom_123456789_20513com_123456789_118col_123456789_20518
00925njm 22002777a 4500
dc
Yeshchanka, L. S.
author
Layeuskaya, Ye. V.
author
Korobko, Ye. V.
author
Novikova, Z. A.
author
2015
In this paper, aluminum orthophosphates of the monoclinic and orthorhombic structure of AlPO[4]× 2H[2]O (metavariscite and variscite, respectively) and modified H[3]PO[4] of Al[2]O[3]· nP[2]O[5]· xH[2]O, where n = 1.1 −1.2, are obtained by the method of isothermal crystallization of aluminophosphate solutions. It is noted that the monoclinic modification is formed from concentrated solution (380 g P[2]O[5]· l–1), orthorhombic – from a dilute (12 g P[2]O[5]· l–1). According to the results of thermal and infrared spectro-scopic studies it is developed that the energy state of the crystal water molecules in the variscite and metavariscite differs significantly. It is shown that the bond of the crystal water molecules for metavariscite is stronger than for variscite. Fillers for electrorheological suspensions on the basis of the synthesized aluminum orthophosphate are obtained by partial dehydration. The activity of fillers on the base of metavariscite ( τЕ / τЕ =0 = 43−50) is significantly higher than that the base on the variscite ( τЕ / τЕ =0 = 8). It is suggested that the concentration of charge carries depending on the degree of proto-nation of proton containing groups in a layered monoclinic structure of metavariscite and their mobility is higher than the concentration and mobility of the protons in the close-packed structure varistcite. It was shown that the presence of phosphoric acid at the surface of the solid phase has almost no effect on value of the electrorheological activity.
Preparation of fillers based on hydrated aluminium orthophosphate for ers / L. S. Yeshchanka [et al.] // Proceedings of BSTU. No. 3. – Minsk : BSTU, 2015. – P. 29-35
https://elib.belstu.by/handle/123456789/20942
546.621.185
ортофосфаты алюминия
электрореологические суспензии
электрореологическая активность
варисцит
метаварисцит
наполнители
Preparation of fillers based on hydrated aluminium orthophosphate for ers
oai:elib.belstu.by:123456789/209552020-10-21T09:44:01Zcom_123456789_20513com_123456789_118col_123456789_20518
00925njm 22002777a 4500
dc
Pavlyukevich, Yu. G.
author
Kravchuk, A. P.
author
2015
An experimental apparatus for forming thin nominals glass by vertical drawing has been developed. The character and duration of transients in the area of sheet glass molding with thickness less than 2 mm in the stability of their geometri c parameters and physicochemical properties have been researched. The time-temperature regimes of drawing of thin nominals sheet glass have been determined. It was found that their molding should be carried out in the temperature range of 840–850°C (glass viscosity 10{4.8}–10{5} Pa · s), since the detaching effect of surface tension forces does not lead to significant narrowing ribbon of the glass. According to the parameters of glass surface quality, glass drawn in this temperature range resembles float glass to some extent. However, it is characterized by the lower thickness (0.5 mm). The temperature increase to 900–950°C (in the active forming zone) causes the decrease of the surface quality and a significant narrowing of the glass ribbon at the expense of forces of surface tension. Being formed in the temperature range of 800–750°C on the roller drawing device the glass ribbon requires more effort high. It reduces the efficiency of the process. The researches of toughness of thin nominals sheet glass demonstrate that the low-temperature ion-exchange treatment in the KNO 3 melt at the temperature of 400–500°C causes significant increase of strength, microhardness and glass heat resistance. The concentration of K {+} ions exercises a decisive impact on glasses properties in this temperature range. Being processed the K{+}ions diffuse to a depth of 10–15 µm of a surface layer of the glass and cause high values of compressive stress.
Pavlyukevich, Yu. G. Production of toughened sheet glasses of thin nominals / Yu. G.Pavlyukevich, A. P. Kravchuk // Proceedings of BSTU. No. 3. – Minsk : BSTU, 2015. – P. 8-12
https://elib.belstu.by/handle/123456789/20955
666.151.1+666.1.039.2
стекло листовое
формование стекла
упрочнение стекла
производство стекла
тонкое стекло
стекло тонких номиналов
Production of toughened sheet glasses of thin nominals
oai:elib.belstu.by:123456789/209232020-10-21T09:44:00Zcom_123456789_20513com_123456789_118col_123456789_20518
00925njm 22002777a 4500
dc
Ashuiko, V. A.
author
Kandidatova, I. N.
author
Novikova, L. N.
author
2015
A way to recycle spent waste sulfuric acid nickel electrolytes by nickel compounds extracting is offered and in this paper. The nickel (II) ions con centration was defined by chemical analysis and solid phase composition were determined by elemental analysis.
Slightly soluble nickel (II) compounds were precipitated with sodium hydroxide solution and satu-rated sodium orthophosphate solution during boiling. Also waste degreasing solution containing sodium hydroxide, sodium carbonate and sodium phosphate was used. Nickel (II) ions extraction degree for degreasing solution precipitation was 97%, and for sodium hydroxide solution or sodium orthophosphate solution precipitation – 99.9%. For nickel (II) compo unds obtained X-ray analysis, elemental analysis
and thermal analysis were carried out, their IR-abs orption spectra micrographs were obtained. Colored compounds obtained from waste electrolytes had various shades of green colour scheme and high concentration of chromofore ions. That made them possible for pigments producing. The precipitates obtained were dried, calcinated, milled, sifted and then used as pigment compositions.
Ashuiko, V. A. Nickel pigments preparation by spent nickel-plating electrolyte precipitation / V. A. Ashuiko, I. N. Kandidatova, L. N. Novikova // Proceedings of BSTU. No. 3. – Minsk : BSTU, 2015. – P. 80-83
https://elib.belstu.by/handle/123456789/20923
667.26+502.174.1+628.54
оксид никеля
фосфатосодержащие пигменты
отработанные растворы никелирования
электрохимическое осаждение
Nickel pigments preparation by spent nickel-plating electrolyte precipitation
oai:elib.belstu.by:123456789/209292020-10-21T09:44:00Zcom_123456789_20513com_123456789_118col_123456789_20518
00925njm 22002777a 4500
dc
Tereschenko, I. M.
author
Dormeshkin, O. B.
author
Kravchuk, A. P.
author
Zhih, B. P.
author
2015
The one-stage processing technique for producing of thermal insulation materials based on silica gel has been developed. Silica gel is AlF3, waste products including following main stages: hydrothermal synthesis polysilicate, granulation, classification and foaming. As compared with well-known analogs, it differs significantly in lower power consumption, does not require complex and expensive equipment, provides the possibility of varying boundary-granulometric composition of the foam product (0.5 to 30 mm). The main influence on the stability of the product quality is caused by the processes of depolymerization and condensation occurring on the stage of hydrosilicates synthesis from the silica gel because of NaOH addition. It was found out that a final foamed product with a bulk density less than 200 kg/m3 can be produced only if depolymerization and polycondensation of the silica gel stages are separated at the time. The values of process parameters (silica module, suspension temperature, the intensity of her mixing, foaming temperature, the quantity and type of modifiers) synthesis of heat-insulating materials have been defined. The required concentration of dissolved silica in the suspension is provided by its intensive mixing for 15–30 min. The temperature of the mixture should not exceed 35–40°C. The most effective technique for the speed polycondensation control is to additive a carbon. Its amount should not be more than 0.2–0.3%. Fast transition gel susp ension is achieved when it is heated to 70–80°C for 10–15 min. After aging and foaming of gels at a temperature of 450–500°C the proposed processing technique allows one to produce the thermal insulation materials possessing the characteristics which are not inferior to those of the foreign ones.
Producing of thermal insulating materials on the basis of silica gel by one-stage processing technology / I. M. Tereschenko [et al.] // Proceedings of BSTU. No. 3. – Minsk : BSTU, 2015. – P. 55-58
https://elib.belstu.by/handle/123456789/20929
666.189.3
теплоизоляционные материалы
деполимеризация
поликонденсация
синтез гидросиликатов
кремнегель
гелеобразование
вспенивание
Producing of thermal insulating materials on the basis of silica gel by one-stage processing technology
oai:elib.belstu.by:123456789/209522020-10-21T09:44:01Zcom_123456789_20513com_123456789_118col_123456789_20518
00925njm 22002777a 4500
dc
Pavlyukevich, Yu. G.
author
Hundzilovich, N. N.
author
2015
Microstructured materials were derived from ceramic masses including alumina GK-2 as a filler, and clay Keramik-Vesko, glass HT-1, gibbsite as a binder. It was found that addition of gibbsite in the binder composition intensifies the formation of mullite in binder as well as on a surface of the grains of the filler. Produced by the thermal dissociation of gibbsite γ-Al2O3 has a high chemical activity and increases crystalliz ation, thereby values of mechanical strength. It was found that additions of HT-1 glass in the binder composition intensify sintering processes of the material due to active physical and chemical interactions between the components of the binder and filler particles to produce eutectic compositions. HT -1 glass is aluminoborosilicate composition. It is chemically and thermally resistant thereby its addition does not decrease the physicochemical properties of the ceramic filter and can reduce the sintering temperature of the material. The pore structure of synthesized material is represented by an extensive network of open pores having an average diameter of 10 µm. It makes them suitable for microfiltration disperse hydrosystems: water treatment, purification of dairy products, blood products, corrosive liquids, etc.
Pavlyukevich, Yu. G. Microstructured high-alumina ceramics for filtration of disperse systems / Yu. G. PavlyukevichN. N. Hundzilovich // Proceedings of BSTU. No. 3. – Minsk : BSTU, 2015. – P. 13-16
https://elib.belstu.by/handle/123456789/20952
666.3-127.7
666.3-134.1
микроструктурированные материалы
керамика высокоглиноземистая
керамические массы
глинозем
наполнители
проницаемая керамика
глина
гиббсит
керамические мембраны
состав керамической массы
Microstructured high-alumina ceramics for filtration of disperse systems
oai:elib.belstu.by:123456789/209212020-10-21T09:43:59Zcom_123456789_20513com_123456789_118col_123456789_20518
00925njm 22002777a 4500
dc
Andrizhievskiy, A. A.
author
Lukashevich, A. G.
author
2015
A method of the analysis of thermal hydraulic parameters of multilayered surfaces of heat exchange is based on the procedure of the use of a real configuration of these surfaces when calculating the introduced constructions. Thus, one of the key moments is realization of a described method in the form of the base program complex including some of modeling blocks, the general user interface and the general information-analytical database. The described modeling blocks contain some N-dimensional and various thematic orientation computing templates including the modeling block of the an alysis of tubular surfaces of heat exchange; the modeling block of the analysis of lamellar heat exchangers; the modeling block of the analysis of processes of the carry of fulfilled nuclear fuel in the st orage systems of the atomic power station. The uniform information-analytical database contains the data about thermo physical properties of working bodies and constructional materials; classification and design features of heat-exchange devices; the methods of analysis and optimization of thermal parameters of heat-exchange devices. The results of application of the program complex indicate its efficiency wh ile analyzing the processes of the carry in areas with the irregular shape. The program complex is supposed to be upgraded.
Andrizhievskiy, A. A. Base program complex of the method of analysis of thermal characteristics of heat-exchange surfaces of complex shapes / A. A. Andrizhievskiy, A. G. Lukashevich // Proceedings of BSTU. No. 3. – Minsk : BSTU, 2015. – P. 89-93
https://elib.belstu.by/handle/123456789/20921
536.2:519.6
теплообменные устройства
многомерные вычислительные модели
теплообменные поверхности
контактные поверхности
теплотехнические характеристики
Base program complex of the method of analysis of thermal characteristics of heat-exchange surfaces of complex shapes
oai:elib.belstu.by:123456789/209262020-10-21T09:44:00Zcom_123456789_20513com_123456789_118col_123456789_20518
00925njm 22002777a 4500
dc
Ramanouski, V. I.
author
Likhavitski, V. V.
author
Rymovskaya, M. V.
author
Hurynovich, A. D.
author
2015
This paper analyzes the existing techniques of disinfection of water wells and drinking water facilities using chlorine-containing disinfectants. The advantages and disadvantages of the promising methods of disinfection by ozone using have been described in the paper. To achieve this goal the recommended values of such parameters as the processing time, the concentration of ozone in the gas mixture, flow rate of ozone, gas mixture flow have been determined. Such values of the investigated parameters in the water treatment as the concentration of ozone in the gas mixture (35, 45, 55 g/m3) and the processing time (15, 30, 45, 60 min) have also been determined. The selection of recommended processing parameters, such factors as the results of studies of the kinetics of ozone water saturation, determination of residual ozone in the water from the incoming in system, the dynamics of ozone decomposition in wa ter, as well as the time required to achieve 100% inactivation of the studied strains of bacteria, the dependence residual ozone concentration of ozone in the gas mixture, the gas mixture flow have been taken into account. To determine the optimal parameters of disinfection depending on the treatment parameters, the regularities presented in the form of equations have been established. The recommended settings to select an ozone generator have been suggested on the basis of these results for proposed scheme of disinfection.
Determination of the main parameters of disinfection of drinking water supply facilities by ozone / V. I. Ramanouski [et al.] // Proceedings of BSTU. No. 3. – Minsk : BSTU, 2015. – P. 64-67
https://elib.belstu.by/handle/123456789/20926
628.162
водозаборные скважины
обработка сооружений водоснабжения
дезинфекция воды
обеззараживание воды
концентрация озона
методы дезинфекции
водоподготовка
дезинфектанты
Determination of the main parameters of disinfection of drinking water supply facilities by ozone
oai:elib.belstu.by:123456789/209602020-10-21T09:44:01Zcom_123456789_20513com_123456789_118col_123456789_20518
00925njm 22002777a 4500
dc
Levitskii, I. A.
author
Papko, L. F.
author
Dyadenko, M. V.
author
2015
Synthesis of fusible glass of ZnO – PbO – B[2]O[3] system at the maintenance of components, wt %: B[2]O[3] – 10–45; ZnO – 5–40; PbO – 50–85 is carried out. It was established that stability of a vitreous state is defined by a ratio of ZnO / (PbO + B [2]O[3]) in the glass composition. Dependences of thermal and rheological characteristics of glass systems of ZnO – PbO – B[2]O[3] from a chemical composition are studied. The increase in the maintenance of B[2]O[3] superseded by PbO causes the essential growth of viscosity and decreas e of its gradient. The components able to reduce viscosity are arranged in the following way: B[2]O[3]→ZnO →PbO. By the results of research of glass rheological properties of ZnO – PbO – B[2]O[3] system, the area of glass compositions with viscosity less than 10{5} Pa · s at a temperature not over 450°C that provides the demanded spreadability indicators is defined. Regulation of indicators of TCLE is reached by creation of compositions glass – a crystal filler. Influence of such crystal filler as zircon, spodumene, cordierite on properties of composite glass-ceramic cement is re searched. The target TCLE indexes being equal to (77 ± 1) · 10{–7} K{–1} are achieved by the introduction of a spodumene. The composite glass-ceramic cement, intended for vacuum-tight connections of fiber-optical elements with a metal frame was developed. TCLE indexes of the glass-ceramic cement are equal to 77.2 · 10{–7} K{–1}, that coordinates it with TCLE containing a fiber-optical element. Temperature of composite glass-ceramic cement soldering is 450 ± 5°C, temperature of its deformation – 520 ± 5°C.
Levitskii, I. A. Glass-ceramic cement for vacuum-tight joint / I. A. Levitskii, L. F. Papko, M. V. Dyadenko // Proceedings of BSTU. No. 3. – Minsk : BSTU, 2015. – P. 3-7
https://elib.belstu.by/handle/123456789/20960
666.117.2
стекло легкоплавкое
стеклоцементы
кристаллические наполнители
синтез стекол
стеклование
оксид цинка
оксид бора
вязкость стекол
кристаллизация стекол
волоконно-оптические элементы
реологические свойства стекол
Glass-ceramic cement for vacuum-tight joint
oai:elib.belstu.by:123456789/209352020-10-21T09:44:00Zcom_123456789_20513com_123456789_118col_123456789_20518
00925njm 22002777a 4500
dc
Yeshchanka, L. S.
author
Alekseev, A. D.
author
Sumich, A. L.
author
Zhuk, G. M.
author
2015
The effect of a content of sodium metasilicate, water glass, and the “matrix” / sodium carbonate mass ration in composition of builder on hygroscopicity, surface activity and detergency of the low-phosphatic detergents are investigated. In order to optimize the composition of the builder 3 factorial experiment based on close to D-optimal plan Kono has been used. The optimal values of the investigat-ed factors for each criterion optimization are determined, equations of private utility functions are obtained and values of the generalized optimization criterion in each row of the experimental design are calculated. As a result, the second-degree polynomial as the dependence of the generalized criterion optimization on three variables − the content of sodium metasilicate (x3), water glass ( x2) and the mass ratio of the “matrix” / carbonate solution ( x1) the following type W = 0.7367 + 0.0798[x1] – 0.1310[x2]– – 0.3410[x3] – 0.0015[x1][x2]+ 0.0021[x1][x3]+ 0.0050[x2][x3] – 0.0009[x1]{2 }+ 0.0096[x2]{2} + 0.0110[x3]{2}is derived. It is shown that the optimum value of hygroscopic point, detergency and surface activity is achieved at two different compositions of the builder. Based on the totality of the data, the optimal composition of the builder comprising 4 wt % of water glass, 4 wt % of sodium metasilicate, and the resulting mass ratio “matrix” / sodium carbonate equal to 43.60 is offered.
Yeshchanka, L. S. Builder composition development for low-phosphatic detergents / L. S. Yeshchanka [et al.] // Proceedings of BSTU. No. 3. – Minsk : BSTU, 2015. – P. 36-39
https://elib.belstu.by/handle/123456789/20935
648.18:661.185.6
солевые композиции
метасиликат натрия
жидкое стекло
карбонат натрия
гигроскопичность
поверхностная активность
моющие средства
малофосфатные средства
Builder composition development for low-phosphatic detergents
oai:elib.belstu.by:123456789/209442020-10-21T09:44:00Zcom_123456789_20513com_123456789_118col_123456789_20518
00925njm 22002777a 4500
dc
Ramanouski, V. I.
author
Zhilinski, V. V.
author
2015
The article presents a comparative analysis of the corrosiveness of chlorine-containing disinfectants such as sodium hypochlorite, calcium hypochlorite and chlorinated lime, and a saturated solution of ozone in water to carbon steel С15E. Investigations have been carried out by weight and indirect electrochemical method, i. e. the Zomelfeld method. The description of the applied methods of the research and the composition of the investigated steel are presented. To determine the resistance band of the metal in relation to the solution of various concentrations the weight and deep coefficient of corrosion rate has been calculated. The physical and chemical processes occurring on the surface of the metal in the treated environment are described. It was found th at the most corrosive test solution is the saturated solution of ozone in water, and the most corrosive chlorine disinfectant is sodium hypochlorite. Calcu-lated on the current density weight and depth corrosion indicators of steel C15E in disinfectant solu-tions are in the 2–17 times higher than those obtained in the test weight. It is noted that for the disinfection of water supply facilities and water wells throug h a substantially shorter processing time by ozone in comparison with chlorine-containing reagents weig ht corrosion rate using ozone is significantly less than the minimum corrosion rate when using chlorinecon taining reactants.
Ramanouski, V. I. Steel C15E corrosion resistance to disinfectants / V. I. Ramanouski, V. V. Zhilinski // Proceedings of BSTU. No. 3. – Minsk : BSTU, 2015. – P. 24-28
https://elib.belstu.by/handle/123456789/20944
628.162
сталь углеродистая
коррозионная устойчивость
коррозионная активность
хлорсодержащие растворы
дезинфицирующие растворы
гипохлорит натрия
гипохлорит кальция
хлорная известь
насыщенные растворы озона
коррозия стали
Steel C15E corrosion resistance to disinfectants
oai:elib.belstu.by:123456789/209272020-10-21T09:44:00Zcom_123456789_20513com_123456789_118col_123456789_20518
00925njm 22002777a 4500
dc
Yukhno, Ye. K.
author
Bashkirov, L. A.
author
2015
La[1–x] Nd[x] InO[3](x = 0.007; 0.02; 0.05); La[0.95]Nd[0.05]In[1–y] M[y]O[3] (M – Cr{3+}, Mn{3+}; y = 0.005), LaIn[1–y]M[y]O[3] ( M – Cr{3+}, Mn{3+}; y = 0.01)solid solutions were obtained by solid-phase route. Their crystal structure, FT-IR spectra, thermal expansion were investigated. Additionally for named solid solutions complex thermal analysis was carried out. It was found that all samples were single-phased and had the structure of orthorhombically distorted perovskite and the lattice parameters vary slightly due to the small content of doping ions. There were absorption bands of La(Nd)–O and In(Cr, Mn)–O stretching vibrations on the FT-IR spectra. The frequencies and intensities of the absorption bands were simi-lar for obtained solid solutions. There were no anomalies caused by phase transitions at temperature de-pendences of elongation. The curves obtained by differential scanning calorimetry had no thermal effects. Total weight loss in the temperature range of 300–1,265 K did not exceed 0.14 wt %. These re-sults indicate that the solid solutions based on LaInO 3 are thermally stable and have a linear coefficient of thermal expansion no greater than (8.3–8.4) · 10{–6} K{–1}. .
Yukhno, Ye. K. Physical and chemical properties of solid solutions based on lanthanum indate doped by Nd{3+}, Cr{3+}, Mn{3+} ions / Ye. K. Yukhno, L. A. Bashkirov // Proceedings of BSTU. No. 3. – Minsk : BSTU, 2015. – P. 59-63
https://elib.belstu.by/handle/123456789/20927
541.1+621.785.36+621.78.011
твердые растворы
кристаллическая структура
индат лантана
тепловое расширение
термический анализ
ИК-спектроскопия
Physical and chemical properties of solid solutions based on lanthanum indate doped by Nd{3+}, Cr{3+}, Mn{3+} ions