METHOD OF PROCESSING MANGANESE ORE Russian patent published in 2012 - IPC C22B47/00 C22B1/06 C22B3/04 

FIELD: chemistry.

SUBSTANCE: method involves grinding ore, mixing the ground ore with sodium bisulphate taken in stoichiometric amount required for binding manganese and impurities into sulphates. The mixture is calcined in three steps to obtain coal tar: at the first step at temperature 200-300°C for 1-2 hours, at the second step at temperature 400-500°C for 0.5-1.5 hours, at the third step at temperature 600-700°C for 2-4 hours. The coal tar is leached with water at temperature 40-80°C for 0.5-1 hour and weight ratio coal tar: water equal to 1:(3-4). After filtering the obtained pulp, sludge is separated and the filtrate is treated with sodium carbonate solution taken in stoichiometric amount required for binding and depositing manganese (II) and iron (II) compounds. After filtering the obtained suspension, the precipitate of manganese (II) and iron (II) carbonates is dried and washed to obtain a manganese concentrate. Calcination exhaust gases are absorbed with the filtrate from the manganese carbonate extraction step to obtain sodium bisulphate solution. Through evaporation of the obtained solution, crystallisation and drying, sodium bisulphate is obtained, which is taken for mixing with the ground ore to obtain the mixture.

EFFECT: simple process and zero-discharge scheme of the process of processing manganese ore.

2 cl, 1 dwg, 2 ex