Determination of the quality of special coke as a result of heat treatment of coal from the Shubarkolskoye field

Abstract

To date, there is a tendency to increase the pace of production in the field of ferrous metallurgy. The constant demand for steel products is accompanied by an increase in prices for raw materials, including carbon reducing agents. In the conditions of the domestic market of Kazakhstan, of great interest is the study and the possibility of using low-baking and non-baking coal as a raw material for the production of special coke used as a reducing agent in metallurgy, the relevance and expediency of which is also due to the resource conservation and energy efficiency program in the use of raw materials put forward by the Government of the Republic of Kazakhstan. In this article, as a result of the search for high-quality, alternative types of reducing agents used in the production of ferroalloys, experimental data of thermal oxidation treatment (coking) of long-flame, non-baking coals of the Shubarkol deposit (Kazakhstan) are presented. In laboratory conditions, during the experiments, the tested grade D coals with a fraction of 70-80 mm were subjected to temperature exposure at temperatures of 800, 850, 900, 950 °C with various preset heating speeds to determine the quality characteristics that meet the requirements for reducing agents for the metallurgical industry, in particular for the production of ferroalloys, in electro thermal, steelmaking, for agglomeration of iron and non-ferrous ores, etc. A technical analysis of long–flame coal was carried out, the volatile and moisture content of which are Vdaf – 44.5%, W – 14.8%, respectively. Also, the obtained special coke was evaluated by the content of volatile components as a result of heat treatment of coals from the Shubarkol deposit: the volatile content averaged 1.73-3.15%, the moisture was 0.73-1.65%.Based on the results of the studies, the possibility of obtaining a special coke from these types of coals with appropriate characteristics was shown.