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CaF2-H2SO4 leaching of a manganese silicate ore.
Lei KPV; Droes SR; Carnahan TG
Paper in Epd Congress 91 TMS 1991 Oct; :63-68
The U.S. Bureau of Mines investigated caf2-assisted h2so4 leaching to extract mn from domestic silicate manganese resources. A pyroxmangite (mn, fe) sio3) ore containing, in pct, 34 mn, 23 si, 3 ca, and 1 fe was leached at 90 deg c for 3 h in a solution containing, in g/l, 12 mn, 140 h2so4, 130 (nh4)2so4, and 5 caf2. Manganese extraction of 92 pct was achieved. Manganese of greater than 99-pct purity was prepared by electrolyzing the purified pregnant solution at a current density of 50 ma/cm2. The current efficiency was 65 pct.
OP; Conference/Symposia Proceedings
Paper in Epd Congress 91, Ed. by D. R. Gaskell. TMS, PP. 63-68
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