Method for recycling bivalent manganese in electrolytic manganese leached residues

Abstract

The invention discloses a method for recycling bivalent manganese in electrolytic manganese leached residues. The method comprises the following steps: using water to carry out counter-current rinsing on the electrolytic manganese leached residues through a filter press to obtain a manganese-containing feed liquid, and detecting the content of the bivalent manganese; adding precipitating agent sodium carbonate to the manganese-containing feed liquid, so as to generate precipitate; carrying out pressure filtration after precipitation to obtain filtrate and filter residue containing manganese carbonate; detecting the content of the manganese carbonate in the filter residue containing the manganese carbonate, directly using the filter residue to prepare a manganese sulphate solution when the Mn(2+) of the manganese carbonate in the filter residue is not less than 80%, and re-precipitating the filter residue when the Mn(2+) of the manganese carbonate in the filter residue is less than 80%. The method has the advantages of being simple to operate, safe, low in production cost, and being suitable for industrial production; and moreover, the Mn(2+) in the electrolytic manganese leached residue is sufficiently recycled, thereby the harm caused due to the fact that the soluble metal Mn (2+) enters the natural environment is reduced and the wastes of a manganese resource is reduced; and besides, the content of Mn(2+) in the recycled manganese carbonate is high and more than 80%, and the recycled manganese carbonate can be directly used for preparing the manganese sulphate solution.

Description

technical field [0001] The invention relates to a method for recycling divalent manganese in electrolytic manganese leaching residue. Background technique [0002] Electrolytic manganese metal is an important metallurgical and chemical raw material. In the production process of electrolytic manganese metal, due to the limitation of the filter press process, the electrolytic manganese leaching residue contains about 30% of water, and 3% to 4% of divalent soluble manganese remains in it, and the electrolytic manganese leaching residue has not been treated, directly Stacking not only wastes resources, but also takes up a large area of ​​land, causing soil and water pollution. Therefore, the recovery and utilization of divalent manganese in electrolytic manganese leaching residue has great practical significance. [0003] CN102021346A discloses "a method for recovering soluble manganese in electrolytic manganese waste residue". The method is to add tap water to the solid manga...

AI Technical Summary

Problems solved by technology

Its disadvantages are: the production cycle of this method is long, the gas used has the risk of air leakage, and there are potential safety hazards; and the verification and operation process is complicated. Although high-grade products can be obtained, the operability is not strong in the actual production process.