Method for producing electrolytic manganese metal from refractory manganese carbonate low-grade ore

The invention discloses a method for producing electrolytic manganese metal from refractory manganese carbonate low-grade ore, and relates to the technical field of electrolytic manganese production. The method comprises the specific steps that the refractory manganese carbonate low-grade ore is ground into manganese powder, the manganese powder, mother liquor and concentrated sulfuric acid are put into a chemical combination tank to be leached, the concentration of leached ore pulp is controlled to be 15%-20%, the concentration of sulfuric acid at the leaching end point is controlled to be 6-8 g/L, the leaching time is controlled to be 3-4 h, and manganese sulfate leach liquor is obtained; adding metallurgical manganese powder, heavy calcium carbonate powder, ammonia water and sodium dimethyl dithiocarbamate into the manganese sulfate leachate, stirring, carrying out filter pressing, standing a new manganese sulfate solution, and adding selenium dioxide to obtain an electrolyte; feeding the electrolyte into