PRODUCTION OF AGLOPORITE FROM ASH OF VARIABLE COMPOSITION OF A COAL-FIRED POWER PLANT

Abstract

Among the existing methods of processing waste from coal-fired thermal power plants, little attention is paid to the problem of ash disposal with variable composition. During the combustion of coals, various chemical reactions occur as part of their mineral part, resulting in the formation of a new technogenic raw material that differs from natural raw materials in chemical and phase composition and has other technological properties. Using the example of a coal-fired power plant burning coals from six different deposits, the ash of which differs in quantitative chemical and phase composition, granulometry, melting point and other properties, the production of agloporite, a promising material for the construction industry, is considered. The production of products is proposed, the method of obtaining which practically does not depend on the composition and properties of the ash of a coal-fired power plant. Ash with the addition of 10% clay undergoes a granulation stage followed by heat treatment at 1500-1700 � C on an agglomeration machine. After cooling, the agloporite consists mainly of glass (~ 50%), quartz modifications (a- and b-), magnetic minerals, and mullite. The bulk density of the agloporite is 500-700 kg/m3, which determines its use in the construction industry, mainly for structural lightweight concrete. Agloporite can also be used in road construction to form side slopes.