AbstractAbout AuthorsReferences
By means of a wide complex of studies it is established that siliceous clays can be an alternative source of raw materials for production of various types of products of construction ceramics. Siliceous clays have a specific mineralogical composition and were previously considered only as an additive to increase the plasticity of the main raw material. The chemical composition, pre-firing and firing properties of siliceous clays of Malchevsky Deposit were studied in detail. The content of silica in them is 67–70%, alumina – 13–15%, and alkaline earth oxides – 1–3%. The main minerals are opal silica and beidellite. The thermograms confirm the presence of montmorillonite, zeolites, micas and hydromicas, opaline silica and quartz. It is established that siliceous clays belong to the groups of medium-dispersed and highly plastic raw materials. Despite the increased molding moisture content and greater shrinkage, they are medium-sensitive to drying and make it possible to obtain the molding masses with a high binding capacity. At the firing temperature of 1000–1020оC brick has no defects, the brand strength is M200-250, and frost resistance – F75. The data of X-rayograms of siliceous clays, fired at temperature 900, 950, 1000, 1050, 1100оС are presented. Significant phase transformations become noticeable at a temperature of 1000оC – the process of transition of amorphous opal silica to cristobalite begins. At 1050оС the formation of the glass phase begins. The results obtained suggest that the main phases of the annealed material on the basis of siliceous clays are quartz and cristobalite with a low degree of structural perfection, and the formation of the microstructure occurs in the range of 1000–1100оC. Based on the study conducted, siliceous clay can be considered as the main and additional material for the production of various building ceramic products.
K.A. LAPUNOVA, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)
Ya.V. LAZAREVA, Engineer (This email address is being protected from spambots. You need JavaScript enabled to view it.)
Yu.A. BOZHKO, Engineer (This email address is being protected from spambots. You need JavaScript enabled to view it.)
M.E. ORLOVA, Bachelor, (This email address is being protected from spambots. You need JavaScript enabled to view it.)
Ya.V. LAZAREVA, Engineer (This email address is being protected from spambots. You need JavaScript enabled to view it.)
Yu.A. BOZHKO, Engineer (This email address is being protected from spambots. You need JavaScript enabled to view it.)
M.E. ORLOVA, Bachelor, (This email address is being protected from spambots. You need JavaScript enabled to view it.)
Don State Technical University (1, Gagarin Square, 344000, Rostov-on-Don, Russian Federation)
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2. Kotlyar V.D., Kozlov G.A., Zhivotkov O.I., Lapunova K.A. The prospects of use siliceous the opoka-like rocks for production of a road brick of low-temperature burning. Stroitel’nye Materialy [Construction Materials]. 2018. No. 4, pp. 13-16. (In Russian). DOI: https://doi.org/10.31659/0585-430X-2018-758-4-13-16.
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4. Lapunova K.A., Kotlyar V.D. [Technology and design a product of wall ceramics on the basis of siliceous the opoka-like rocks]. Rostov-on-Don. RGTU. 2014. 193 p.
5. Kotlyar V.D., Lapunova K.A. Features of physical and chemical transformations when roasting opoka-like rocks raw materials. Stroitel’nye Materialy [Construction Materials]. 2016. No. 5, pp. 40–42. (In Russian).
6. Bozhko Yu.A., Lapunova K.A., Kozlov G.A. The pressing process of powders on the basis of siliceous opoka-like rocks. Materials Science Forum. 2018. Vol. 931, pp. 515–519. https://doi.org/10.4028/www.scientific.net/MSF.931.515
7. Ustinov A.V., Kotlyar V.D. Caking of a clay molding by production of a ceramic brick. Inzhenernyi vestnik Dona. 2012. No. 3 (21), pp. 588–591. (In Russian).
8. Kotlyar V.D., Lapunova K.A., Kozlov G.A. Wall ceramics products based on opoka and coal slurry. Procedia Engineering. 2016. No. 150, pp. 1452–1460. https://doi.org/10.1016/j.proeng.2016.07.080
9. Bondaryuk A.G., Kotlyar V.D. Wall ceramics on a basis the opoka-like of siliceous and carbonate breeds and artificial siliceous and carbonate compositions. Izvestiya vysshikh uchebnykh zavedenii. Stroitel’stvo. 2010. No. 7 (619), pp. 18-24. (In Russian).
10. Bozhko Yu.A. Brick of soft molding on the basis of siliceous and clay components. Izvestiya vuzov. Investitsii. Stroitel’stvo. Nedvizhimost’. 2018. No. 3, pp. 54–60. (In Russian).
2. Kotlyar V.D., Kozlov G.A., Zhivotkov O.I., Lapunova K.A. The prospects of use siliceous the opoka-like rocks for production of a road brick of low-temperature burning. Stroitel’nye Materialy [Construction Materials]. 2018. No. 4, pp. 13-16. (In Russian). DOI: https://doi.org/10.31659/0585-430X-2018-758-4-13-16.
3. Terekhina Yu.V., Kotlyar V.D., Kotlyar A.V. Sheka S. I. Opoka-like rocks of the South of Russia and perspective the direction of their use in production of construction materials. Novye tekhnologii. 2012. No. 4, pp. 61–65. (In Russian).
4. Lapunova K.A., Kotlyar V.D. [Technology and design a product of wall ceramics on the basis of siliceous the opoka-like rocks]. Rostov-on-Don. RGTU. 2014. 193 p.
5. Kotlyar V.D., Lapunova K.A. Features of physical and chemical transformations when roasting opoka-like rocks raw materials. Stroitel’nye Materialy [Construction Materials]. 2016. No. 5, pp. 40–42. (In Russian).
6. Bozhko Yu.A., Lapunova K.A., Kozlov G.A. The pressing process of powders on the basis of siliceous opoka-like rocks. Materials Science Forum. 2018. Vol. 931, pp. 515–519. https://doi.org/10.4028/www.scientific.net/MSF.931.515
7. Ustinov A.V., Kotlyar V.D. Caking of a clay molding by production of a ceramic brick. Inzhenernyi vestnik Dona. 2012. No. 3 (21), pp. 588–591. (In Russian).
8. Kotlyar V.D., Lapunova K.A., Kozlov G.A. Wall ceramics products based on opoka and coal slurry. Procedia Engineering. 2016. No. 150, pp. 1452–1460. https://doi.org/10.1016/j.proeng.2016.07.080
9. Bondaryuk A.G., Kotlyar V.D. Wall ceramics on a basis the opoka-like of siliceous and carbonate breeds and artificial siliceous and carbonate compositions. Izvestiya vysshikh uchebnykh zavedenii. Stroitel’stvo. 2010. No. 7 (619), pp. 18-24. (In Russian).
10. Bozhko Yu.A. Brick of soft molding on the basis of siliceous and clay components. Izvestiya vuzov. Investitsii. Stroitel’stvo. Nedvizhimost’. 2018. No. 3, pp. 54–60. (In Russian).
For citation: Lapunova K.A., Lazareva Ya.V., Bozhko Yu.A., Orlova M.E. Phase transformations when firing of siliceous clays. Stroitel’nye Materialy [Construction Materials]. 2019. No. 4, pp. 8–11. DOI: https://doi.org/10.31659/0585-430X-2019-769-4-8-11 (In Russian).