Govorova, Larisa Pavlovna

Kisner, A. S.

Zagainova, L. A.

Electronic archive of Tomsk Polytechnic University

XVII Международная научно-практическая конференция имени профессора Л.П. Кулёва508inVestiGation of the maGnesium-siliCate raw materials of ural-siberian reGion for CeramiC ProPPants obtaininG L.P. Govorova, A.S. Kisner, L.A. ZagainovaScientific Supervisor – DSc, Professor, T.V. Vakalova Linguistic Advisor – PhD, Associate Professor, A.E. AbakumovNational Research Tomsk Polytechnic University 634050, Russia, Tomsk, Lenin Avenue, Building 30, lgovorovatpu@yandex.ruThe main problems in the preparation of mag-nesium-silicate proppants from the compositions of serpentinite, dunite and olivinites (their natural mixtures) are associated with difficulties of sinter-ing process of granular material based on them This is due to the fact that the main crystalline phase, that is formed during the firing from such natural raw materials, represents a difficult sintering magnesium ortho-silicate - forsterite. It affects the the relatively low strength of the ceramic material, especially in a granular state, and necessitates the firing temperature increasing, which leads to increased process energy requirements. The solving of these problems is impossi-ble without comprehensive investiga-tion of the chemical and mineralogical composition of the raw material and its structural-phase changes during ther-mal destruction.The aim of this work is a com-prehensive investigation of magne-sium-silicate raw materials of Khakas areas.Results of the rocks chemical composition investigation are shown in Table 1.The high values of mass loss on ignition of Khakass magnesium-sili-cate rock, equal to 13.95%, indicates its mainly serpentinite composition. Also the high content of iron oxide is characteristic for this rock (10.4% in the calcined state). Magnesium-sili-cate module (MgO/SiO2) of Khakass rock is equal to 0.78 (less than 1) and indicates a high content of silica in the rock.Evaluation of the investigated rock mineralogical composition was carried out by X-ray method. Analy-sis of diffraction patterns of the initial (uncalcined) investigated sample (Figure 1a) shows that its main rock-forming mineral is serpentine, as evidenced by the characteristic reflections with in-terplanar distance of 0.734; 0.364; 0.254 nm, and olivine (Mg, Fe)2SiO4 (0.276; 0.243 nm).X-ray method investigations of physical and fig. 1.  X-ray diffraction pattern of the initial serpentine (a) and calcined at 900 °C (b) and 1100 °C (c)BCA Секция 7.  Химия и химическая технология на иностранном языке509chemical processes that take place during firing of Khakass magnesium-silicate rock are shown (Fig-ure 1b, 1c), that at the 900 and 1000 °C thermal destruction of the rock-forming minerals olivine and serpentine causes synthesis of the main crystal-line phases – forsterite (2MgO • SiO2) and enstatite (MgO • SiO2). The emergence of hematite reflexes (0.277, 0.252;. 0.232 nm, etc.) on the X-ray diffrac-tion patterns of the fired samples in the temperature range 800–1000 °C, caused to the processes of de-composition of olivine with the release of hematite (of Fe2O3).Thus, Khakassia magnesium-silicate rock is a form of dunite rock with a high degree of ser-pentinization, that determines its prospects in the ceramic proppants forsterite-enstatite composition technology.inVestiGation of the kaolin suCh as a raw material for the teChnoloGy of ProPPantsL.P. Govorova, A.P. PotapovaScientific Superviser – DSc, Professor, T.V. Vakalova Linguistic Advisor – PhD, Associate Professor, A.E. AbakumovNational Research Tomsk Polytechnic University 634050, Russia, Tomsk, 30 Lenin Avenue, lgovorovatpu@yandex.ruThe main difficulties of technology of ceram-ic proppants are necessity of high compressive strength and low bulk density combination. One of the main way to improve the compressive strength of the aluminosilicate proppants is the activation process of sintering the granular materials. The aim of this work is a comprehensive in-vestigation of kaolin from the Borovichy-Lyubytino deposit (Novgorod region). Kaolin is the main raw material for the aluminosilicate proppants. Kaolin is characterize the aggregation of clay particles due to cementing effect of alumino-siliceous colloids of complex composition, which complicates the pro-cess of sintering of the clay. The investigations of chemical-miner-alogical and grain composition of Borovichy kaolin shows next results. Granulometric composition of kaolin is highly disperse clay materials with content of fraction less than 1 micron more than 60%. The chemical com-position (chart 1) in accordance with State standart 9169-81 show that kaolin represent a Al2O3 (calcined 45.7 wt. %) with an average content of coloring oxides Fe2O3 + TiO2 (less than 3.5%).Mineralogical composition show that the kaolin is a monomineral raw material with an impurity. In the clay part is hydromica (il-lite), in non-plastic parts is quartz (Picture 1). The technological properties of kaolin are determine by the chemical-mineralogical composition and grain characteristics. Low- and moderate plasticity, low sensitivity to drying, enough high connectedness are technological properties. Borovichy-Lyubytino kaolin belong to the raw material non- sintering up to the temperature of 1400 °C. High content of cristobalite in samples of kaolin (calcined at 1400 °C) is the main cause of the low compressive strength of the plastic molding samples (no more than 40 MPa).table 1. The chemical composition of the investigated magnesium-silicate rockThe content of oxides by weight. % ModuleSiO2 MgO Fe2O3 Al2O3 TiO2 Сао MnO K2O Na2O mпрк MgO/SiO241.06 31.24 8.93 0.02 0.05 0.68 0.25 0.03 3.79 13.95 –47.71 36.31 10.38 0.02 0.06 0.79 0.34 0.03 4.41 – 0.78fig. 1.  X-ray diffraction pattern of Borovichy kaolin

Investigation of the magnesium-silicate raw materials of Ural-Siberian region for ceramic propp ants obtaining

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