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Method for recovering valuable metals from waste lithium iron phosphate battery cathode material

A lithium iron phosphate battery and cathode material technology, applied in battery recycling, waste collector recycling, recycling technology and other directions, can solve the problems of unqualified products, long process flow, difficult to control the recycling process, etc., to ensure high-grade, Simplify the process steps and achieve the effect of high-grade recovery and recycling

Active Publication Date: 2018-06-01
MEISHAN SHUNYING POWER BATTERY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. In the wet leaching process mentioned above, it is often necessary to use strong oxidizing and acidic substances such as hydrogen peroxide and sulfuric acid. High corrosion requirements and high equipment costs
Moreover, lithium elements are not preferentially leached, resulting in a large consumption of leaching acid or alkali leaching solution, and the recovery process is complicated. The recovered lithium carbonate products are often of low grade and cannot be directly used as battery materials for recycling.
[0005] 2. The direct preparation of lithium iron phosphate cathode materials by high-temperature calcination often has a long process flow, which requires relatively strict detection and dosage adjustment steps. The recovery process is difficult to control, and it is easy to cause unqualified products and waste of raw materials, so the practical application is very limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] After dismantling and crushing the positive electrode material of the waste lithium iron phosphate battery, weigh 100 parts of the processed battery positive electrode material and put it into a boat box without any substance, and then put it in a roasting furnace at 200-1000°C. Air or oxygen roasting, the roasting exhaust gas is passed into the lime emulsion, after 1-5 hours of heat preservation, stop heating and cooling down to take out the roasting material; add 300-400 parts of pure water to the roasting material, pump the diluted and mixed roasting material into the stirring reaction kettle, Raise the temperature to 30-90°C, then add dilute hydrochloric acid into the stirred reactor, stir evenly, adjust the pH of the mixture to 3.0-5.0, dissolve for 1-5 hours, filter and wash. The filter cake is washed and dried to obtain Fe 2 o 3 、FePO 4 After drying, it can be recycled as a raw material for synthesizing lithium iron phosphate or non-toxic anti-rust paint. Then...

Embodiment 2

[0040] Disassemble, grind, and magnetically separate the positive electrode material of the waste lithium iron phosphate battery, weigh 100 parts of the processed battery positive electrode material, put it into a boat box without any substance, and place it in a roasting furnace at 300-800°C Air or oxygen is used for roasting, and the roasting exhaust gas is passed into the lime emulsion. After 1.5-4 hours of heat preservation, stop heating and cool down to take out the roasting material; add 300-400 parts of pure water to the roasting material, and pump the diluted and mixed roasting material into the stirring reactor , heat up to 30-90°C, then add dilute phosphoric acid into the stirred reactor, stir evenly, adjust the pH value of the mixture to 2.5-4.5, dissolve for 1-4h, filter and wash. The filter cake is washed and dried to form a pure mixture of Fe2O3 and FePO4. After drying, it can be recycled as a raw material for synthetic lithium iron phosphate or non-toxic antirust...

Embodiment 3

[0043] Disassemble, grind, and magnetically separate the positive electrode material of the waste lithium iron phosphate battery, weigh 100 parts of the processed battery positive electrode material, put it into a boat box without any substance, and place it in a roasting furnace at 400-600°C Air or oxygen is used for roasting, and the roasting exhaust gas is passed into the lime emulsion. After 2-3 hours of heat preservation, stop heating and cool down to take out the roasting material; add 300-400 parts of pure water to the roasting material, and pump the diluted and mixed roasting material into the stirring reactor , heat up to 60-80°C, then add dilute phosphoric acid into the stirred reactor, stir evenly, adjust the pH value of the mixture to 3.0-4.0, dissolve for 2-3 hours, filter and wash. The filter cake is washed and dried to obtain Fe 2 o 3 、FePO 4 After drying, it can be recycled as a raw material for synthetic lithium iron phosphate or non-toxic anti-rust paint; t...

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Abstract

The invention discloses a method for recovering valuable metals from a waste lithium iron phosphate battery cathode material. The method specifically comprises the following steps: (1) fully roastingand oxidizing the disassembled, broken and ground lithium iron phosphate battery cathode material, so that Fe and Li metal elements in the battery cathode material are generated into Fe2O3, FePO4 andLi3PO4 through being roasted and oxidized; (2) placing a roasted material that is fully-roasted and oxidized in the step (1) in a dilute acid solution for soaking, so that Li3PO4 in the roasted material is fully dissolved and filtered to realize the separation of the Li3PO4 in the roasted material from the Fe2O3 and the FePO4; (3) taking a filtrate after treatment in the step (3) and regulating the filtrate to be alkaline, so that Li3PO4 in the filtrate is directly separated out into a precipitate. Therefore, the recovery of the solid Li3PO4 is realized. The method disclosed by the invention is short in technical process, simple to operate, low in cost and environmentally-friendly and can preferentially select and recycle the high-grade lithium metals in the lithium iron phosphate batterycathode material, thereby having a wide industrial application prospect.

Description

technical field [0001] The invention relates to the field of secondary recycling and utilization of waste battery resources, in particular to a method for recovering three valuable metals, phosphorus, iron and lithium, from waste lithium iron phosphate battery anode materials. Background technique [0002] Under the dual pressure of energy saving and emission reduction, new energy vehicles have become the direction of the future development of the automobile industry. With the vigorous promotion of the government, the new energy automobile industry will enter the rapid development stage from the initial stage. As the second most critical component of new energy vehicles, the demand for power batteries is growing rapidly. Among them, iron phosphate carp battery is widely used in new energy vehicles because of its high theoretical capacity, good discharge platform, excellent cycle stability and low price. The reasonable recycling of waste iron phosphate carp materials will p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54C22B7/00C22B26/12
CPCC22B7/007C22B26/12H01M10/54Y02P10/20Y02W30/84
Inventor 赵林龙泽彬赵澎李伟
Owner MEISHAN SHUNYING POWER BATTERY MATERIALS CO LTD
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