This Bureau of Mines paper indicates that a high-carbon ferrochromium can be smelted satisfactorily from a chromite concentrate derived from domestic laterite residues in a small electric arc furnace, provided suitable flux additions are made and the phosphorus and sulfur levels can be decreased during the subsequent steelmaking process. From 78 to 97 pct of the chromium can be recovered in a ferroalloy containing 54 or higher wt pct chromium, depending on the amount of carbon used. Approximately 120 pct of the stoichiometric carbon requirement should be added to produce acceptable results. This can be divided equally between wood chips and a reductant such as metallurgical-grade coke. Chromium recovery and final slag basicity were decreased when less carbon was used. In general, techniques for smelting lateritic chromites parallel those for the production of high-carbon ferrochromium from off-grade chromites. On the basis of this research, an agglomeration procedure may not be required for this material as long as submerged arc conditions are maintained. Dusting and handling losses were comparable to those experienced in commercial chromite smelting operations that use coarser ores and concentrates.
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