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

A lithium iron phosphate and recovery method technology, which is applied in the field of comprehensive recovery of waste lithium manganese oxide and lithium iron phosphate positive electrode materials to prepare battery-grade lithium carbonate, can solve the problems of simple process, high comprehensive recovery rate, difficult control of process conditions, and energy utilization. High efficiency and other problems, to achieve the effect of simple production process and conditions, suitable for popularization and use, and high energy utilization rate

Pending Publication Date: 2020-08-04
赣州龙凯科技有限公司
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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 conditio

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

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Embodiment 1

[0061] This specific embodiment is to comprehensively recycle the lithium manganate and lithium iron phosphate positive electrode materials obtained by physical dismantling and recycling of different types of waste lithium batteries. The general steps can be seen in the appendix figure 1 , figure 1 It is a process flow chart, and the specific steps are:

[0062] (1) Lithium iron phosphate powder mixing: put 100Kg of lithium iron phosphate powder (Li: 4.0%) in a sealed stirring reactor a, add water to make slurry, the liquid-solid ratio is 3:1, and start stirring.

[0063] (2) Reductive leaching of lithium manganate: put 38Kg of lithium manganate (Li: 3.5%) in a closed reaction kettle b, add water to adjust the slurry until the liquid-solid ratio is 1:1, start stirring to adjust the slurry, and then slowly add 31% Concentrated hydrochloric acid, the amount of hydrochloric acid added is: the total molar ratio of concentrated hydrochloric acid to lithium manganate is 8:1, with t...

Embodiment 2

[0073] This specific embodiment is to comprehensively recycle the lithium manganate and lithium iron phosphate positive electrode materials obtained by physical dismantling and recycling of different types of waste lithium batteries. The general steps can be seen in the appendix figure 1 , figure 1 It is a process flow chart, and the specific steps are:

[0074] (1) Lithium iron phosphate powder mixing: put 100Kg of lithium iron phosphate powder (Li: 3.8%) in a sealed stirring reactor a, add water to make slurry, the liquid-solid ratio is 2:1, and start stirring.

[0075] (2) Reductive leaching of lithium manganate: put 40Kg of lithium manganate (Li: 3.7%) in a closed reaction kettle b, add water to adjust the slurry until the liquid-solid ratio is 1:1, start stirring to adjust the slurry, and then slowly add 25% Concentrated hydrochloric acid, the amount of hydrochloric acid added is: the total molar ratio of concentrated hydrochloric acid to lithium manganate is 9:1, with t...

Embodiment 3

[0085] This specific embodiment is to comprehensively recycle the lithium manganate and lithium iron phosphate positive electrode materials obtained by physical dismantling and recycling of different types of waste lithium batteries. The general steps can be seen in the appendix figure 1 , figure 1 It is a process flow chart, and the specific steps are:

[0086] (1) Lithium iron phosphate powder mixing: put 100Kg of lithium iron phosphate powder (Li: 3.65%) in a sealed stirring reactor a, add water to make slurry, the liquid-solid ratio is 4:1, and start stirring.

[0087] (2) Reductive leaching of lithium manganate: put 50Kg of lithium manganate (Li: 3.3%) in a closed reaction kettle b, add water to adjust the slurry until the liquid-solid ratio is 3:1, start stirring to adjust the slurry, and then slowly add 20% Concentrated hydrochloric acid, the amount of hydrochloric acid added is: the total molar ratio of concentrated hydrochloric acid to lithium manganate is 10:1, with...

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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...

Claims

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Application Information

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IPC IPC(8): C01D15/08C22B26/12C22B7/00H01M10/54
CPCC01D15/08C22B26/12C22B7/007H01M10/54Y02W30/84Y02P10/20
Inventor 刘超傅小龙傅子凯刘美美傅翔傅志杰邓飞
Owner 赣州龙凯科技有限公司
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