Production of test products from the bioprocessed ceramic masses under production conditions of JSC “Belkhudozhkeramika”

Abstract

The production expediency of bacteria Bacillus amyloliquefaciens G, isolated from clay from Belarusian deposit Gaidukovka for improvement of properties of raw materials was shown under production conditions of JSC “Belkhudozhkeramika”. Preparations for processing of raw clay materials were obtained by cultivation of bacteria B. amyloliquefaciens G in different nutrient media. Processing of a forming slurry was car-ried out during 72 h at a temperature 28–30 °С, pottery mass was kept for 5 days at a temperature 23–25° С. Further, the technological process of production of pottery corresponded to production regulations. The viscosity and coefficient of solidification of a ceramic slurry decreased as a result of bacterial processing, crock set duration significantly reduced. Air linear shrinkage of samples after burning did not exceed 5%. The processing conditions leading to the most essential decreas e of water absorption of samples are established, that is the evidence of in crease of their mechanical strength, are established. Electron microscopic images of chipped surfaces of test samples are character ized by higher firmness and uniformity in comparison with an industrial sample. The maxi mum dense surface is formed and porosity of products decrease s at the repeated molding. Positive impact on maturing of clays, processed by cultural liquid of bacteria B. amyloliguefaciens G, on plastic properties of pottery masses was first shown.