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Harmless method utilizing cement kiln to co-process residues after recovering metals from waste and old lithium batteries

A waste lithium battery and co-processing technology, applied in cement production and other directions, can solve problems such as low heavy metal content, and achieve the effect of avoiding difficult treatment and saving water resources

Inactive Publication Date: 2016-08-03
SHANGHAI JULANG PROTECTING ENVIRONMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the above problems, aiming at the low content of organic matter and high content of heavy metals in the residue after recycling heavy metals in the existing waste lithium battery treatment, which contains certain harmful elements such as chlorine and sulfur, which are easy to incinerate and dispose of. To solve the technical problem of producing dioxins, and provide an economical and efficient method of harmless waste residue

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A certain batch of waste lithium batteries is crushed and pyrolyzed at high temperature, and the obtained powdery alloy is dissolved with hydrochloric acid. After co-precipitation with sodium hydroxide, a complexing agent is added to the precipitate to complex the heavy metals Co, Ni, and Cu. Wait for recycling. In the remaining residue, the main elements are Li: 18.91wt%, Co: 3.35wt%, Fe: 10.24wt%, Al: 7.63wt%, Na: 15.21wt% and Cl: 1.07wt%, etc. 56.41wt%, using cement kiln for co-processing.

[0023] (1) After weighing the residue, send it to the first cleaning tank according to the mass ratio of water and residue 5:1, use a mechanical mixer to stir for 20 minutes and then settle naturally. The supernatant is pumped to the sewage treatment center, and the precipitated residue is sent to The second cleaning tank, after the same operation, the supernatant is pumped to the first cleaning tank, and the residue is sent to the third cleaning tank. The pool is filled with n...

Embodiment 2

[0032] After a batch of waste lithium batteries are crushed and high-temperature thermally decomposed organic matter, the remaining metal powder is dissolved with nitric acid, and the solution is added to potassium hydroxide for precipitation, and the metals such as Co, Li, Ni, and Cu are complexed and recovered. The main elements of the remaining residue are: Co (2.21wt%), Li (17.23wt%), Ni (1.07wt%), Fe (14.19wt%), K (9.47wt%), NO 3- (4.57wt%), Cl (0.27wt%).

[0033] (1) After weighing, send it to the first cleaning tank for mixing according to the mass ratio of water and residue 4:1, stir for 20 minutes and then settle naturally. The supernatant is pumped to the sewage treatment center, and the sedimented residue is sent to the second cleaning tank. After the same operation, the supernatant is pumped to the first cleaning tank, the residue is sent to the filter press process, and new water is added to the second cleaning tank. NO in the residue after two washes 3- reduced...

Embodiment 3

[0037] Example 3:

[0038] The flue gas and clinker from the rotary kiln pass through water-cooled quenching equipment to ensure that the temperature is quickly reduced to below 170°C, exceeding the synthesis temperature of dioxins. Qualified cement clinker is obtained through crushing and ball milling.

[0039] By comparing the change of cement quality before and after co-processing the waste lithium battery residue in the cement kiln, it can be obtained from the results in Table 1 that the main properties of the cement after this method is mixed with the waste lithium battery residue into the cement rotary kiln are not obvious. changes, indicating the feasibility of this method.

[0040] sample Initial setting / min Final setting / min 3d compression / MPa 28d compression / MPa Loss on ignition / % Alkali / % Cl / % normal production 146 183 10.8 33.9 0.61 0.17 0.05 Residue blending 129 175 10.4 33.1 0.60 0.30 0.05 GB175-2007 ≥ 45 ≤ 39...

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Abstract

The invention relates to a reclaiming method utilizing a cement kiln to co-process residues after recovering metals from waste and old lithium batteries. The method comprises the following steps: washing residues after recovering metals from waste and old lithium batteries by water until the pH value is reduced to about 9-10, wherein pH of residues is increased so as to promote the passivation of heavy metals and reduce dissolving-out of heavy metals; after water washing, performing press filtering and dehydration; drying the dehydrated mud cake of residues by a waste heat recover technology of novel dry process cement clinker production line until the water content is less than 30%; measuring the main components of dried residues, according to a certain ration, mixing residues with raw materials, homogenizing the mixture, introducing the mixture into a novel dry process cement rotary kiln from a pre-decomposition kiln, and burning the mixture to produce cement clinker. Through the cooperation of a dry process kiln, the metals in residues are immobilized, moreover, trace metal elements in residues can play the role of a mineralizing agent during the sintering process of cement clinker, and the sintering is promoted. The method can harmlessly processes residues after recovering metals from waste and old lithium batteries and provides a novel way for completely utilizing battery wastes.

Description

technical field [0001] The invention belongs to the technical field of hazardous waste disposal in the field of environmental protection, and in particular relates to a method for co-processing the residues recovered from waste lithium battery metals through a cement kiln after pretreatments such as washing, filtering, and drying. Background technique [0002] As human society moves from industrial civilization to ecological civilization, the demands of the entire planet on environmental quality continue to increase. In recent years, since electricity can be obtained from clean energy sources such as nuclear energy, wind energy, and hydropower, the trend of electric products replacing fossil fuels is becoming more and more obvious. In recent years, the consumption of electric vehicles in China is growing exponentially, which brings about the continuous increase in the consumption of lithium-ion power batteries. However, this has also brought new environmental problems, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/24C04B7/38
CPCC04B7/24C04B7/38Y02P40/10
Inventor 顾卫星李璐徐波翟贺菊贺欣蔡乐崔尚玮
Owner SHANGHAI JULANG PROTECTING ENVIRONMENT CO LTD
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