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Are the results of studies to determine the granulometric composition of stone-like clay raw materials of various degrees of lithification? argillite-like clays, mudstones, shales using laser diffractometry methods. The features in the granulometric composition of these rocks, as well as the influence of the duration and intensity of their dispersion, have been revealed. The possibility of using the method of laser diffractometry in assessing the quality of this type of raw material for the production of various types of ceramic products is shown.
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The chemical and mineralogical composition of the leucocratic granites of the Kargali deposit has been studied and the microstructures have been investigated using petrographic and raster-electron-microscopic analyzes. Leucocratic granite mainly consists of minerals microcline, albite and quartz and is a valuable nonmetallic ceramic raw material, which makes it possible to replace imported scarce feldspar materials in the composition of ceramic masses.
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The chemical and mineralogical compositions, physicochemical characteristics and the degree of degeneration of the quartz mineral in the highly siliceous rocks of the Dzherdanak deposit have been investigated. It has been established that this deposit, along with quartzites, also contains shales and sandstones. It is shown that these high-silica raw materials are promising for the development of compositions of ceramic and refractory materials.
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The thermal properties and phase composition of zeolites of the Vanginsky and Kulikovsky deposits of the Amur region were investigated by the method of X-ray diffraction. The temperature interval of the existence of the structure of zeolites of these deposits has been established. The scheme of obtaining zeolite concentrate has been tested
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Domestic commercially available powders? -Al
2 O
3 are considered and evaluated for use as raw materials for the production of high-strength ceramics. Additional chemical cleaning and mechanical treatment of alumina GDT can improve the ceramic properties of the material. Ceramics obtained from fine-crystalline alumina produced by ZAO Nano-composite, in terms of density and microhardness, surpasses all the materials considered, including ceramics obtained from Almatis-1200 alumina.
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The efficiency of iron removal in the biochemical method of kaolin processing depends on the particle size of iron minerals, their magnetic properties and structural organization - weakly crystallized and crystalline magnetically ordered. It has been shown that preliminary disaggregation of kaolin particles during wet grinding and bioreduction of Fe (III) during storage of a kaolin suspension with the subsequent conversion of iron compounds from weakly magnetic and hardly soluble to soluble or highly magnetic promotes the removal of iron from kaolin. The advantage of combining storage of a suspension of kaolin with washing of kaolin with ammonium oxalate followed by magnetic separation has been revealed.
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The efficiency of iron removal from kaolin increases with the inclusion of iron bioreduction in the technological scheme. The process can be accelerated by a combination of factors of humidity and temperature of the suspension, the state of the pH-Еh medium, the composition of the nutrient medium and inoculum from the microbial community. In the stagnant regime of the moisture content of the kaolin suspension, the bioreduction of iron is accompanied by the formation of Fe (II) -Fe (III) -containing minerals, and as a result, the reduction process stops.
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The effect of complex organomineral deflocculators based on oxyphenolfurfural oligomers on the surface tension at the liquid-gas interface, as well as on the value of the contact angle and the work of wetting the surfaces of aluminum oxide, marble and quartz is shown. The phenomenon of synergism was confirmed when introducing complex organomineral deflocculators with an optimal ratio of components into slip ceramic masses containing alumino-oxygen compounds.
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The effect of a complex thinner based on soda, water glass and oxyethylidene diphosphonic acid on the rheological and casting properties of the Stephan Sсhmidt 13250 clay suspension and on the mechanical properties of dried and fired samples has been studied. The additive allows to reduce the moisture content of the clay suspension while maintaining its operating parameters. An increase in the strength and density of dry and fired clay specimens is observed, as well as a decrease in shrinkage and porosity.
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Hits: 23818
The flowchart of a two-stage method for removing iron from the composition of porcelain stone is presented: with a combination of bio- and chemical reduction of iron under conditions of stagnant and water humidity regimes. The whiteness of the porcelain stone increases both after aging and after subsequent iron removal operations with a difference in their contribution: washing with ammonium oxalate & gt; magnetic separation & gt; rinsing with water.
