METHOD OF PROCESSING MANGANESE CARBONATE ORE Russian patent published in 2012 - IPC C22B47/00 C22B1/02 C22B3/04 

FIELD: chemistry.

SUBSTANCE: method involves leaching alkali and alkali-earth metals with a solution of a chlorine-containing reagent and separating the insoluble residue containing manganese dioxide. The ore undergoes preliminary decarboxylation via thermal treatment at temperature 750-1000°C for 2-4 hours to obtain coal tar. The chlorine-containing reagent used when leaching the coal tar is 10-40% aqueous ammonium chloride solution, taken in weight ratio ore: ammonium chloride equal to 1:1-2. Leaching is carried out at temperature 20-100°C for 1-2 hours. After separating the insoluble residue, the filtrate is carbonised with exhaust gases from the ore decarboxylation step, followed by separation of the obtained calcium carbonate and return of the aqueous ammonium chloride solution to the coal tar leaching step.

EFFECT: obtaining quality end product - manganese dioxide concentrate and a by-product - calcium carbonate using a zero-discharge process scheme.

1 dwg, 1 tbl, 1 ex