Carbothermic Reduction and Leaching of Manganese Ores from the West- central Arkansas District.
O'Connor-WK; White-JC; Turner-PC
Paper in Epd Congress '92: Proc Symposia Sponsored by Extraction & Proc Div TMS PP 379-96 :379-96
The U.S. Bureau of Mines has conducted beneficiation, carbothermic reduction, and leaching tests of mn oxide ores as part of its evaluation of the mn and CO resources of the West-Central Arkansas District. The major mn oxides in the ore include cryptomelane, psilomelane, pyrolusite, and lithiophorite. Cobalt is contained within the mn oxides. Nonbeneficiated ore was reduced at 800 deg c with coal and leached in ammonium sulfate and ammonium carbonate leach liquors. Ore concentrates were calcined at 600 deg c prior to reduction under the same conditions as the raw ore. Head analyses reported up to 21 pct mn and 0.11 pct carbon monoxide Extractions of 70 to 90 pct mn and 40 to 60 pct CO were achieved.
Paper in Epd Congress '92: Proc. Symposia Sponsored by Extraction & Proc. Div. TMS, PP. 379-96