METHOD OF CHEMICALLY ENRICHING OXIDE-CARBONATE ORES Russian patent published in 1997 - IPC

FIELD: mineral dressing. SUBSTANCE: ore is crushed to particle size 0.1 mm and subjected to autoclave leaching of manganese with saturated calcium chloride solution at ratio 1:(3.0-3.5) followed by heating slurry for 0.5-1.0 h and pumping it through battery of autoclaves heated to 200-220 C. Then slurry is supplemented with 40-65% (based on solid weight) calcium chloride and such amount of ferrous chloride providing its concentration in solution 2.0-2.5%. Slurry is once again pumped through autoclave battery at 200-220 C for 0.5-1.0 h, supplemented with more ferrous chloride to its concentration in solution 2.0-2.5% and pumped through autoclave battery at 240-260, cooled to 90-100 C, freed from solids, and manganese compounds are precipitated and calcined. EFFECT: enhanced efficiency of process.