Comprehensive recovery method of waste lithium manganate and lithium iron phosphate positive electrode material

Abstract

The invention discloses a comprehensive recovery method of a waste lithium manganate and lithium iron phosphate positive electrode material. The recovery method aims at solving the technical problemsthat in the prior art, the energy consumption is large, the energy utilization rate is low, certain potential safety hazards exist, meanwhile, the environment is greatly damaged, and process conditiondetails are difficult to control in the process operation process. The method comprises the steps of lithium iron phosphate powder size mixing, lithium manganate reduction leaching, lithium iron phosphate oxidation leaching, solid-liquid separation, washing, neutral impurity removal, alkaline impurity removal, concentration and sodium precipitation, and lithium precipitation, recovery of the waste lithium manganate and the lithium iron phosphate positive electrode material to obtain battery-grade lithium carbonate. The recovery method can be used for simultaneously recovering and treating thepositive electrode materials of the two waste lithium ion batteries; an oxidizing agent and a reducing agent needed in the prior art do not need to be added, high-temperature reaction is not needed,energy consumption is low, the energy utilization rate is high, meanwhile, the process is simple, the comprehensive recovery rate is high, the technological process is energy-saving, environment-friendly and high in safety, and high economic benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of battery recovery, in particular to a method for comprehensively recovering lithium from waste lithium manganate and lithium iron phosphate cathode materials to prepare battery-grade lithium carbonate. Background technique [0002] With the rapid development of modern science and technology, the problem of social energy and environmental ecological pollution has become increasingly prominent. Under the background of the country's vigorous promotion of the development and application of new energy batteries, the pollution of various waste batteries to the ecological environment has become the focus of social attention. Especially in recent years, the increasing demand of consumers for such products has led to the continuous growth of the output of lithium-ion batteries and the quantity of waste lithium-ion batteries. The increasingly wide application of lithium batteries will inevitably produce a large numbe...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies of the prior art, the object of the present invention is to provide a comprehensive recovery method for waste lithium manganese oxide and lithium iron phosphate positive electrode materials. , and there are certain safety hazards, and at the same time, it will cause great damage to the environment, and the technical problems of the details of its process conditions are difficult to control; The oxidizing agent and reducing agent required in the prior art are added, and no high-temperature reaction is required, the energy consumption is small, the energy utilization rate is high, and the process is simple and the comprehensive recovery rate is high, and the process is energy-saving and environmentally friendly, with high safety and high economic benefits.

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