Obtaining agloporite from ash of ekibastuz coal selected from ash dump of crpp-3 of almaty city
Kuldeyev E.I. Nurpeisova М.B. Estemesov Z.A. Аshimova А.А. Barvinov А.В.
2023National Academy of Sciences of the Republic of Kazakhstan
News of the National Academy of Sciences of the Republic of Kazakhstan, Series of Geology and Technical Sciences
2023#2023Issue 2142 - 148 pp.
Purpose of these studies is to study physical and chemical properties of ash and slag waste from coal combustion from Ekibastuz deposit in the CRPP-3 of Almaty city, to determine possibility of obtaining demanded building products from them. Methodology. To study phase composition and structure of ash and slag waste, methods of X-ray phase and differential thermal and chemical analyzes were used on the latest installations of leading countries. Results. Coal-fired power plants annually produce large volumes of ash and other byproducts of coal combustion. Although almost 50% of fly ash is disposed of in various areas of economy, most of the fly ash is disposed of in landfills. Ash contains hazardous leachable trace elements such as As, B, Cr, Mo, Ni, Se, Sr and V, which have a negative impact on environment due to potential leaching from acid rain and groundwater. Urgency and significance of this problem is intensified with fact that technogenic wastes of CRPP are not sufficiently processed, current ash wastes accumulate and occupy vast areas, which takes them out of land use. Utilization of ash dumps makes it possible to reduce the technogenic load on environment and ensure rational use of secondary raw materials. Possibility of obtaining agloporite from the ash of Ekibastuz coals used by thermal power station in Almaty has been studied. Chemical and granulometric composition of ash and slag was determined. Performed X-ray phase and differential thermal analysis. Analysis of chemical composition of the Ekibastuz ash gives idea of the composition of mineral substances of coal. Main constituents are oxides of silicon and aluminum, there is also a large amount of iron oxide. Knowledge of chemical composition of ash is necessary to decide whether it can be used to produce building materials. Obtaining demanded building materials from technogenic raw materials is an urgent task. Results of heat treatment in gradient furnace are presented. Conclusions are drawn about possibility of using ash and slag waste in construction industry. Thus, all studies have shown possibility of using ash and slag waste as a secondary raw material in order to reduce anthropogenic load on the environment. Novelty lies in practical implementation of obtaining agloporite gravel grade «600» using as a raw material ash dumps of CRPP-3 in Almaty, which is ash of Ekibastuz coal. Study results make possible to increase degree of complexity and environmental safety of development of technogenic waste — this is development of industrial and innovative power of state, respect for natural resources and the environment. Practical significance lies in fact that production of building products quickly pays off, does not require expensive installations, tools and equipment.
Aggloporite gravel , CRPP-3 , Ekibastuz coal ash , Granules , Soda and soda-calcium glass
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Kazakh National Research Technical University, Almaty, Kazakhstan
“Central Laboratory of Tests and Certification Construction Materials”, 95 Ryskulov St., Almaty, Kazakhstan
Department of “Central Laboratory of Tests and Certification Construction Materials”, 95 Ryskulov St., Almaty, Kazakhstan
Kazakh National Research Technical University
“Central Laboratory of Tests and Certification Construction Materials”
Department of “Central Laboratory of Tests and Certification Construction Materials”
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