Chernyak L. Structure and properties of chemical-resistant ceramics synthesized using technogenic stuff

The Subject of Studies - the research work focuses on studying the chemically resistent ceramics produced from mass comprising technogenic and natural raw materials; Research Objective and Tasks - the development of physica/chemical principles for the production technology of chemically resistant ceeramics of the improvet performance qualities (equally high acid and alkali resistance) by way of controlling the ceramics chemical-mineralogical composition and the structure parameters with the account of the maximum possible utilization of raw of technogenic origin; The Methods of Studies - the theoretical principles are based on the fundamental laws of the physical chemistry of silicates, physical/chemical mechanics of the disperse systems and chemical technology of ceramics; the research also involves the thermo dynamical analusis of the projected phase composition of ceramics and the combination of physical-chemical analusis and thehnology tests; The Academic and Practical Value - the solution is presented for the important research and development challenge of producing the new class of the national ceramics materials characterized by the equally high resistance to both acid and alcali effects. There have been indentified the specifics of the sintering and structuring processes of the masses produced from raw materials of natural and technogenic origin. The academic formulation of the principes of crystalline structure formation, which ensures high chemical resistance of ceramics including fast baking regimes have been presented. Innovation aspect - the systematic research allowed the formulation and academic grounding of the priciples for the formation of the crystalline structures, which ensure high chemical resistance, extended also onto the fast baking regimes. It has been also demonstrated that the equally high resistance to acid and alcali effects can be achived in formation of the crystalline structured from masses based on raw materials of the natural and technogenic origin, the chemical-mineralogical composition of which brings about the phase transformation in baking in the systems CaO-SiO2-Al2O3, Fe2O3-SiO2-Al2O3, SiO2-Al2O3-Fe2O3-CaO; it has also been defined that anorthite, hematite and corundum in their capacity of the phase components of the crystalline of ceramics produce the positive impact in improving the alkaline resistance. It has also been demonstrate that in principle it is feasible to control the phase content and improve the chemical resistance of ceramics priduced from masses with a certain technogenic content through the crystalline systems formed in the process of the initial high-temperature treatment (volcanic activities, metal melting) and formed directly in the process of ceramics bacing. Implementation manurity - development of the new specifications TY Y 26.2-32798982-536:2005 "Chemical-Resistant Ceramics Products" for the new national class of materials characterized by the equal acid and alkali resistance; the proposed technology has been laboratory and field tested and approved for introduction at Zavod Ceramperlit Company (Kyiv); "Ecosynthez Ceramic" Ltd. and Sytall Ltd (Slov'yansk, Donetsk Obl.) and Zevs Ceramics Company (Slov'yansk, Donetsk Obl.) for manufacturing chemicfl-resistant ceramics. Applications - the developed technologies for manufacturing chemical-resistant ceramics of the enhanced performance characteristics are intended for implementation at current ceramics operations as well as for new-ceramics set-ups immediately at the operation facilities generating technogenic secondary raw materials; the products characterized by the equal acid and alkali resistance can be used in production of components and constructions of chemical, petroleum, paper industries and agricultural operations.