Method for producing electrolytic manganese by using low-grade manganese oxide three-ore method

Abstract

The invention discloses a method for producing electrolytic manganese by using low-grade manganese oxide (lean ore) through a three-ore mixing direct reduction process (called a three-ore method for short), which comprises the following steps of: adding sulfuric acid for leaching without heating by using low-grade manganese oxide mineral powder, low-grade high-sulfur high-iron waste residue and low-grade manganese carbonate tailings as raw materials; and removing harmful impurities through three times of impurity removal and three times of filter pressing to obtain a pure manganese sulfate solution containing 30-40g/L of manganese, adding an electrolytic additive, introducing into an electrolytic bath, and electrolyzing by taking a lead plate as an anode and stainless steel as a cathode to obtain an electrolytic manganese product with the manganese weight content of more than 99.7%. According to the method for producing the electrolytic manganese, the low-grade manganese oxide mineral powder, the low-price low-grade high-sulfur high-iron waste residues and a small amount of low-grade manganese carbonate tailings are used as raw materials, the three kinds of ores are all waste ores without market value, the production cost is greatly reduced, the leaching rate of manganese is high, the reduction conversion rate is high, the environmental pollution is small, and the produced high-purity electrolytic manganese product has good economic benefits. The yield is high and the quality is good.

Description

technical field [0001] The invention relates to the technical field of electrolytic production of metal manganese, in particular to a method for producing electrolytic manganese by a low-grade manganese oxide three-mineral method. Background technique [0002] Electrolytic manganese metal refers to the elemental metal obtained from manganese ore through acid leaching to obtain manganese salt, and then sent to the electrolytic cell for electrolysis. Iron-like in appearance, irregular flakes, hard and brittle, bright on one side, rough on the other, silvery white to brown, silvery gray after processing into powder; easily oxidized in air, dissolved and replaced by dilute acid Hydrogen, when slightly higher than room temperature, can decompose water and release hydrogen gas. Manganese and manganese alloys are one of the indispensable and important raw materials for the steel industry, aluminum alloy industry, high-energy battery, magnetic material industry, and chemical indust...

AI Technical Summary

Problems solved by technology

However, the wet process based on direct reduction acid leaching has problems such as slow leaching speed, low manganese leaching recovery rate, side reaction manganese dithionate affecting the quality of the final manganese product, and system acid expansion.

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