Prereduction and Melting of Domestic Chromites.
Nafziger RH; Sanker PE; Tress JE; McCune RA
Proc 38th Electric Furnace Conf Iron and Steel Soc AIME Pittsburgh, Pennsylvania, 1980 Dec; :19 pages
The Bureau of Mines has prereduced domestic chromites to provide a suitable charge material for the production of ferrochromium in an electric arc furnace. As part of the Bureau's goal to economically and efficiently recover metal values from domestic resources, this investigation has shown that prereduction of domestic chromites increases productivity and decreases electric energy consumption, compared with results where unreduced materials were used. Approximately 75 pct chromium metallization and 75 pct total metallization were realized when high-iron chromites from Montana were prereduced with coal char and coke breeze in a batch rotary kiln. Chromium and total metallizations near 95 pct were obtained when a metallurgical-grade chromite was prereduced. Satisfactory ferrochromium for the production of stainless steel was produced in an electric arc furnace from all of the prereduced materials.
Proc. 38th Electric Furnace Conf., Iron and Steel Soc., AIME, Pgh. Pennsylvania, Dec. 11-12, 1980