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Method for removing iron in waste ternary lithium battery recovery process

A ternary lithium battery, waste technology, used in battery recycling, waste collector recycling, recycling technology and other directions, can solve the problems of difficult filtration of sediments, secondary pollution, etc., to achieve good filtration performance and increase added value.

Inactive Publication Date: 2021-07-02
北京佰利格瑞资源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for removing iron in the recycling process of waste and old ternary lithium batteries. The method removes Fe in the acid leaching solution of waste and old ternary lithium batteries in the form of iron yellow, which solves the current problem of waste and old ternary lithium batteries. It is difficult to filter the precipitate in the battery acid immersion solution, and the organic solvent is easy to cause secondary pollution, which also improves the added value of the product.

Method used

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  • Method for removing iron in waste ternary lithium battery recovery process
  • Method for removing iron in waste ternary lithium battery recovery process
  • Method for removing iron in waste ternary lithium battery recovery process

Examples

Experimental program
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Effect test

Embodiment 1

[0025] 1. Add excess iron powder to the pickling solution of waste ternary lithium battery positive electrode / cell powder, stir at 55°C for 0.5h, and filter to obtain the pickling solution after copper removal (see Table 1).

[0026] 2. Heating in a water bath and controlling the temperature at 30°C. During the stirring process, the flocculant polyacrylamide was added to the acid dipping solution of the waste ternary lithium battery after copper removal according to 0.5% of the mass of the iron element, and then a certain concentration of ammonia water was added to adjust the pH to 1, and stirred for 2 hours.

[0027] 3. Raise the temperature of the water bath to 40°C, ventilate air at a ventilation rate of 6 L / min, add a certain concentration of ammonia water to adjust the pH to 3, and stir for 3 hours.

[0028] 4. Filtrate, wash the precipitate, and obtain the iron yellow product (see Table 2) after drying.

[0029] Table 1. Solution composition list after iron removal (uni...

Embodiment 2

[0034] 1. Add excess iron powder to the pickling solution of the waste ternary lithium battery positive electrode / cell powder, stir at 55°C for 0.5h, and filter to obtain the pickling solution after copper removal (see Table 3).

[0035] 2. Heating in a water bath and controlling the temperature at 35°C. During the stirring process, the flocculant polyethyleneimine was added to the acid dipping solution of the waste ternary lithium battery after copper removal according to 1.7% of the mass of the iron element, and then a certain concentration of ammonia water was added to adjust the pH to 1.7, and stirred for 1 hour.

[0036] 3. Raise the temperature of the water bath to 55°C, feed air at a ventilation rate of 4 L / min, add a certain concentration of ammonia water to adjust the pH to 4, and stir for 2 hours (see Table 4).

[0037] 4. Filtrate, wash the precipitate, and dry to obtain the iron yellow product.

[0038] Table 3. Solution composition list after iron removal (unit: ...

Embodiment 3

[0043] 1. Add excess iron powder to the pickling solution of the waste ternary lithium battery positive electrode / cell powder, stir at 55°C for 0.5h, and filter to obtain the pickling solution after copper removal (see Table 5).

[0044] 2. Heating in a water bath and controlling the temperature at 40°C. During the stirring process, the flocculant polyethyleneimine was added to the acid dipping solution of the waste ternary lithium battery after copper removal according to 1% of the mass of the iron element, and then a certain concentration of ammonia water was added to adjust the pH to 2.5, and stirred for 0.5h.

[0045] 3. Raise the temperature of the water bath to 70°C, ventilate air at a ventilation rate of 2L / min, add a certain concentration of ammonia water to adjust the pH to 5, and stir for 1 hour.

[0046] 4. Filter, wash the precipitate, and obtain the iron yellow product (see Table 6) after drying.

[0047] Table 5. Solution composition list after iron removal (uni...

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Abstract

The invention discloses a method for removing iron in a waste ternary lithium battery recovery process, which comprises the steps of copper removal, water bath heating, stirring, drying and the like, and the method removes Fe in a waste ternary lithium battery pickle liquor in the form of iron oxide yellow, thus the problems that precipitates are difficult to filter, secondary pollution is easily caused by organic solvents and the like when the Fe is removed from the waste ternary lithium battery pickle liquor at present are solved, and the added value of the product is also improved. The method for preparing the iron oxide yellow is applied to impurity removal of the waste ternary lithium battery pickle liquor mainly comprising Ni, Co and Mn, and the application scene of preparing the iron oxide yellow is expanded. The step of firstly preparing a seed crystal in iron oxide yellow preparation is omitted.

Description

technical field [0001] The invention specifically relates to a method for removing iron in the recycling process of waste ternary lithium batteries, which is mainly used in the field of recycling battery materials. Background technique [0002] The recovery process of valuable elements in waste ternary lithium batteries is usually to pickle the positive electrode or battery powder first, then remove impurities such as Al, Fe, Cu, etc., and finally recover valuable elements by precipitation or extraction. At present, the commonly used iron removal methods in the recycling process of waste ternary lithium batteries include extraction and precipitation methods. Due to the high price of organic solvents in the extraction method, it is easy to cause secondary pollution and other problems, so the precipitation method is the main iron removal method in the recycling process of waste ternary lithium batteries. Common methods for iron removal by precipitation include Fe(OH) 3 Preci...

Claims

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Application Information

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IPC IPC(8): C22B7/00H01M10/54
CPCC22B7/006H01M10/54Y02W30/84Y02P10/20
Inventor 谢宇充
Owner 北京佰利格瑞资源科技有限公司
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