Method for producing electrolytic manganese from manganese carbonate ore with low manganese content and high iron content

Abstract

The invention discloses a method for producing electrolytic manganese from manganese carbonate ore with low manganese content and high iron content. According to the method, the manganese carbonate ore with low manganese content and high iron content is mixed with manganese dioxide ore, and a direct leaching method is adopted. According to the technical scheme, the manganese carbonate ore is directly acid-leached to prepare a manganese sulfate solution, then the solution is prepared into electrolyte by a series of processes of neutralization, purification and filtering, and the electrolyte can enter an electrolytic bath for electrolysis by adding additives such as selenium dioxide, ammonium sulfite and the like. The method disclosed by the invention has the characteristics that a series of problems that reduction process equipment utilizing manganese dioxide ore to produce electrolytic manganese is large in investment, complex in process and high in cost, has serious production conditions and can not meet the requirements on environmental protection and the like for a long time are solved, and a new path for producing the electrolytic manganese from the manganese dioxide ore is provided; simultaneously, a new path for developing and utilizing the manganese carbonate ore with low manganese content and high iron content is also provided, so that the wastes can become valuables and national resources are fully utilized.

Description

technical field [0001] The present invention relates to smelting, further to metallic manganese, specifically to a method for producing electrolytic manganese by utilizing low-grade manganese carbonate ore, more specifically a method for producing electrolytic manganese by utilizing manganese-poor high-iron manganese carbonate ore. Background technique [0002] The vast majority of electrolytic manganese enterprises in my country use manganese carbonate ore as raw material, and it takes 8-10 tons of manganese carbonate ore to produce one ton of electrolytic manganese. After decades of mining, the manganese carbonate ore with more than 20% is rare in China at present, the grade is generally 12%-15%, and the grade used in some areas has been as low as 8%-12%. According to the mining standard of the industry, such manganese carbonate ore has no mining value. [0003] Manganese carbonate ore is directly prepared by the reaction of sulfuric acid and manganese carbonate to prepar...

AI Technical Summary

Problems solved by technology

Manganese ions in manganese dioxide exist in a tetravalent form, and the oxides of tetravalent manganese ions are insoluble in dilute sulfuric acid. Only by reducing manganese dioxide to manganese oxide can they be dissolved in dilute sulfuric acid, and the reduction process requires energy consumption, and at the same time reduces equipment investment. large, expensive to produce

For a long time, the reduction process of manganese oxide ore cannot be promoted due to large equipment investment, complex process, high cost or poor production conditions, and cannot meet environmental protection requirements.

[0005] Manganese-poor high-iron manganese carbonate ore refers to low-grade manganese ore containing 8-12% manganese and 10-21% iron. It is a manganese ore resource with lower value. High iron will make the feed liquid system become colloidal, making filtration difficult, and the consumption of ammonia water is high