Method for preparing ferric manganese oxalate from high-iron manganese oxide ore

Abstract

The invention discloses a method for preparing ferric manganese oxalate by using high-iron manganese oxide ore, which comprises the following steps: leaching manganese from ore: preparing slurry from an oxalic acid / ferric oxalate mixed solution as a leaching agent and high-iron manganese oxide, and carrying out solid-liquid separation after leaching to obtain iron-containing slag and a separation solution I; reducing and precipitating iron and manganese: reducing the separation liquid I, and carrying out solid-liquid separation to obtain iron and manganese oxalate precipitate and a separation liquid II; recycling ferric manganese oxalate: washing and drying the ferric manganese oxalate precipitate to obtain pure ferric manganese oxalate; and preparing a leaching agent: supplementing oxalic acid into the separation liquid II to obtain a mixed solution, then performing slurry preparation on the mixed solution and iron-containing slag, performing solid-liquid separation after leaching to obtain leached waste residues and a mixed solution containing oxalic acid / ferric oxalate, and returning the mixed solution containing oxalic acid / ferric oxalate for reuse to form a circulating process. The preparation method can effectively solve the problems of high cost and large pollutant discharge amount in the existing method, and can realize resource utilization of the high-iron manganese oxide ore.

Description

technical field [0001] The invention relates to the technical field of resource utilization of high iron manganese ore, in particular to a method for preparing iron manganese oxalate by using high iron manganese oxide ore. Background technique [0002] Lithium-ion batteries have many advantages such as high energy density, long cycle life, low environmental pollution and no memory effect, and have become an important basis for supporting the development of current electric vehicle power sources. As one of the mainstream batteries in the current electric vehicle market, lithium iron phosphate has excellent performance in terms of safety and cycle life, but its low electrical conductivity and low bulk density have become the shortcomings that limit its development. Lithium iron manganese phosphate is a new type of battery material obtained by adding manganese to lithium iron phosphate batteries. It has a high voltage platform and its theoretical energy density is 15-20% higher...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a method for utilizing high-iron manganese oxide ore to prepare iron-manganese oxalate, which can effectively solve the existing The method has the problems of high cost and large pollutant discharge, and at the same time can realize the resource utilization of high iron manganese ore

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