METHOD FOR COMPUTATION AND INVESTIGATION OF THERMAL PERFORMANCE OF FLASH SMELTING PROCESSES

摘要

A method has been developed for definition of mathematical three-dimensional zonal models of heat exchange in autogenous smelting furnaces, and in particular in an oxygen-flame furnace (KFP). The paper presents the results of studies into the thermal performance of an operating KFP-1 furnace at the Almalyk copper smelter in case of smelting of standard-grade concentrate and demonstrates the feasibility of the smelting process with burners located in the furnace roof without any furnace design modification. A full-scale KFP furnace with vertical arrangement of the flame has a temperature lower by 110 C to 175 C as compared with a similar furnace with horizontal burners and a similar cooling system; the off-gas temperature at the furnace outlet decreases also by 52 C, while the temperatures of matte and slag at the furnace outlet virtually do not change. An analysis of the thermal efficiency of two design modifications of a planned KFP-2 furnace has been made for the second stage of the Almalyk copper smelter extension. Optimal cooling conditions for the lining have been determined depending on the length of sulfide flame, feed charge supply rate and the heat generation by the feed charge.