Modern trends in the processing and disposal of ash and slag in Karaganda

Abstract

The subject of the study is the ash and slag material of the Karaganda coal industry. The purpose of the work is to establish the main quality indicators of ash and slag material of Karaganda coal and consider ways to use ash and slag waste as a source of a secondary resource for various heavy and agro-industrial purposes. The annual amount of waste generated in developed countries is up to 15 tons per person per year, in Kazakhstan - about 60 tons. The main share of waste in the Republic of Kazakhstan falls on industrial areas and is represented by overburden rocks of the mining sector, enrichment tailings, ash and slag waste. Ash and slag and flue gases are the main technogenic wastes from TPPs and GRESs. The output of ash and slag waste depends on the type of fuel and is 10-15% for brown coal, 30-40% for hard coal. In the Republic of Kazakhstan, the annual output of ash and ash and slag mixtures from coal combustion is approximately 19 million tons, and approximately 300 million tons of waste have been accumulated in ash dumps by now. Scope: production of building materials (cements, silicate and clay bricks, concrete stones, porous aggregates for concrete, asphalt concrete) and agro-industry.