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UTILIZATION OF ASH FROM THE COMBUSTION OF KUZNETSK AND EKIBASTUZ COALS
Abstract
One of the promising areas of utilization of solid technogenic waste from energy generation is their processing to produce alumina, the production of which is accompanied by the formation of by-products that can be used to produce belite sludge (2CaO-SiO2). The basic schemes of purification of the initial ash from carbon and iron oxides are proposed. Using the example of ash from coal burning in the Ekibastuz basin, the possibility of obtaining two grades of belite sludge is shown. Up to 1.5-1.8 tons of belite sludge can be obtained per ton of recycled ash (depending on its quality), which can be used in cement production. The article presents the results of experimental studies aimed at developing a technology for producing belite sludge from high-alumina ash from coal-fired power plants. The influence of various technological parameters on the process of obtaining the target product has been studied. A solution of sodium silicate with the extraction of 28% silica into it was obtained by the method of alkaline desilination of ash. The possibility of obtaining a white, high-quality belite sludge suitable for the production of white cement by treating a solution of sodium silicate with calcium oxide is shown. At the second stage, during the processing of alumina concentrate, gray belite sludge was obtained suitable for use in the construction industry
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