Abstract
This work presents the results of the laboratory research on the impact of grain size composition of raw mixtures on properties of heat processed products when implementing the compression molding method. We have analyzed opokas of several fields: Zhuravksy, Shevchenkovsky and Bekeshevsky. Grain size composition of ground materials was characterized by a greater grain size of 0,315; 0,63; 1,25 and 2,5 mm. The link between degree of grinding and caking index, water absorption, mean density, compression and bending resistance was established. The conclusions based on the research results revealed the impact of grain size composition on properties of ceramic products and application potential of opokas as a feedstock in the ceramics industry.
Highlights
Wall ceramics have always been one of the main types of construction materials in building engineering
According to the domestic and foreign experience, as well as the technical and economic analysis, compression molding technology has a number of advantages and becomes widespread in Russia and in Western Europe [1,2,3,4]
If ceramic raw materials can be referred to the category of caking, it has a linear firing shrinkage of about 10-15%, which is 15-20 times greater than the total thermal expansion
Summary
Wall ceramics have always been one of the main types of construction materials in building engineering. The Russian industry of wall ceramics has been gradually improving its performance both quantitatively and qualitatively. New factories are being built, the product range is being expanded, but this happens overwhelmingly due to the supply of imported technological lines of plastic molding, while construction of semi-dry molding plants is rare cases. According to the domestic and foreign experience, as well as the technical and economic analysis, compression molding technology has a number of advantages and becomes widespread in Russia and in Western Europe [1,2,3,4]. It should be emphasized that the term “semi-dry molding” is not really correct scientifically and technically, and it has developed historically. The term “compression molding” is more appropriate, which is proposed G.D. Ashmarin and other researchers [5].
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