Method for removing impurities from waste battery leachate

A technology for waste batteries and leaching solution, applied in the direction of improving process efficiency, can solve the problems of high loss rate of valence metals, low production efficiency, long adsorption time, etc., and achieve the effect of saving auxiliary material cost, fast filtration speed and simple process

Inactive Publication Date: 2020-06-19
HUNAN BRUNP RECYCLING TECH +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the process adopts the vulcanization method to remove impurities, and there will be H in the process of removing impurities. 2 The generation of S is not conducive to environmental protection, and S remains in the solution 2- , and the loss rate of valuable metals is high
Invention patent CN 101492772A (the technology of removing fluorine and chlorine by the industrialized ion exchange method of wet zinc smelting) enters the zinc sulfate solution containing high fluorine and chlorine into the ion exchange column, and the resin absorbs fluorine and chloride ions to remove fluorine and chlorine from the solution, but the process requires Long adsorption time and low production efficiency

Method used

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  • Method for removing impurities from waste battery leachate

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Effect test

Embodiment 1

[0058] A method for removing impurities from the leachate of waste batteries, comprising the following steps:

[0059] (1) Substitution and copper removal

[0060] Take 2L of the sulfuric acid leaching solution of waste lithium-ion batteries (in which the concentration of Ni is 48.93g / L, the concentration of Co is 45.43g / L, the concentration of Mn is 18.49g / L, and the concentration of Cu is 3.65g / L). 8g of iron powder, stirred for 1 hour, filtered to obtain the copper-removed solution, and the Cu concentration in the copper-removed solution was detected to be 0.1981g / L.

[0061] (2) goethite method to remove iron and aluminum

[0062] Take 1.8L of the copper-removed liquid obtained in step (1), adjust pH=2, take samples and titrate ferrous ions, Fe 2+ The concentration is 4.20g / L, at 60°C, add 8g of 30% hydrogen peroxide, and stir for 30min, the titrated ferrous ions are all oxidized. Take 20mL ferrous removal solution and dilute it to 100mL as the base liquid, add 20% Shua...

Embodiment 2

[0070] (1) Substitution and copper removal

[0071] Take 2L of the sulfuric acid leaching solution of waste lithium-ion batteries (in which the concentration of Ni is 61.77g / L, the concentration of Co is 37.53g / L, the concentration of Mn is 3.60g / L, and the concentration of Cu is 2.22g / L). 5.5g of iron powder, stirred for 1h, filtered to obtain the copper-removed solution, and the Cu concentration in the copper-removed solution was detected to be 0.1014g / L.

[0072] (2) goethite method to remove iron and aluminum

[0073] Take 1.8L of the copper-removed liquid obtained in step (1), adjust pH=2, take samples and titrate ferrous ions, Fe 2+ The concentration is 3.75g / L. At 60°C, add 3g of sodium chlorate and stir for 30min. After titration, all ferrous ions are oxidized. Take 20mL of ferrous removal solution and dilute it into 100mL as the bottom solution, add 15% soda ash solution and the remaining ferrous solution to the bottom solution respectively by means of peristaltic p...

Embodiment 3

[0081] (1) Substitution and copper removal

[0082]Take 2L of sulfuric acid leaching solution from waste lithium-ion batteries (in which the concentration of Co is 94.52g / L, the concentration of Ni is 2.51g / L, and the concentration of Cu is 6.89g / L). The solution after copper removal was obtained by filtration, and the Cu concentration in the solution after copper removal was detected to be 0.091g / L.

[0083] (2) goethite method to remove iron and aluminum

[0084] Take 1.8L of the copper-removed liquid obtained in step (1), adjust pH=2, take samples and titrate ferrous ions, Fe 2+ The concentration is 7.08g / L. At 60°C, add 6g of sodium chlorate and stir for 30min. After titration, all ferrous ions are oxidized. Take 20mL of ferrous removal solution and dilute it into 200mL as the bottom solution, add 15% soda ash solution and the remaining ferrous solution to the bottom solution by using a peristaltic pump to control the adding speed of the ferrous solution and soda ash sol...

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Abstract

The invention relates to a method for removing impurities from waste battery leachate. The method comprises the following steps that iron powder is added, and filtering is carried out after stirring so as to obtain a copper-removed solution; an oxidant is added to obtain a ferrous-removed solution; a small amount of the ferrous-removed solution is taken and diluted to serve as a base solution, theferrous-removed solution and a pH regulator are added, the pH regulator is continuously added after the ferrous-removed solution is completely added, and filtering is carried out after stirring so asto obtain an iron-aluminum-removed solution and iron-aluminum slag; fluoride is added into the iron-aluminum-removed solution, and filtering is carried out after stirring so as to obtain a calcium-magnesium-removed solution; the obtained iron-aluminum slag is added, and filtering is carried out after stirring so as to obtain fluorine-silicon-removed solution and fluorine-silicon-removed iron-aluminum slag; and manganese powder is added into the fluorine-silicon-removed solution, and filtering is carried out after stirring so as to obtain a purified solution. According to the method, the ironpowder is used for replacing and removing copper, and the cost is low; iron and aluminum are removed through a goethite method, and the slag filtering performance is good; fluorine and silicon are removed from the iron-aluminum slag, so that the waste slag is effectively utilized, and the iron-aluminum slag pickling process is reduced; and the copper is deeply removed through the manganese powder,the environment is protected, and the operation is easy.

Description

technical field [0001] The invention belongs to the technical field of waste battery recycling, and relates to a method for removing impurities from a leachate of a waste battery, in particular to a method for removing impurities from a sulfuric acid leachate of a waste lithium ion battery. Background technique [0002] Lithium-ion batteries were successfully developed in 1990. It is to embed lithium ions into carbon to form negative electrodes, replacing the metal lithium or lithium alloy negative electrodes of traditional lithium batteries. The negative electrode materials are mainly petroleum coke and graphite, which not only maintains the advantages of high specific energy and high specific power of lithium batteries, but also replaces the deposition and dissolution process on lithium electrodes due to the intercalation-intercalation process of lithium ions on carbon negative electrodes. The problem of dendrite penetration of lithium generated on the surface of the negat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B23/00C22B47/00
CPCC22B7/006C22B23/0461C22B23/0469C22B47/00Y02P10/20
Inventor 鲁俊雀王杜刘勇奇巩勤学郑宇付中梦周荣超谭运军
Owner HUNAN BRUNP RECYCLING TECH
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