Method of recovering lead from scrap lead-acid storage battery lead plaster

A technology for waste lead-acid batteries and lead paste is applied in the field of recovering lead from waste lead-acid battery lead paste, which can solve the problems of high energy consumption cost and high energy consumption of lead paste, and achieve low cost, low energy consumption and reagent consumption. less effect

Active Publication Date: 2016-11-09
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pyrometallurgical processing of lead paste not only consumes high energy costs, but also produces SO 2 , volatile lead dust and other air pollutants
[0005] The three-stage wet electrowinning process of desulfurization conversion-leaching-electrowinning is a typical wet lead recovery process at present, but the problem of high energy consumption still needs to be solved

Method used

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  • Method of recovering lead from scrap lead-acid storage battery lead plaster

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Effect test

Embodiment 1

[0022] Leaching: 1kg lead paste (Pb 71.1%), leaching agent is 350g / L aluminum chloride solution, reducing agent FeCl 2 4H 2 The amount of O is 0.4kg, the leaching temperature is 80°C, the leaching time is 2h, and the liquid-solid ratio is 35.5:1. Lead leaching rate reaches 98.9%.

[0023] Replacement of lead: use aluminum plate as the replacement agent, the replacement temperature is 30°C, the amount of aluminum plate is 1 times the theoretical amount, and the replacement is 1h to obtain a total of 702g of fine lead sludge with a lead content of 99.1%.

[0024] Aluminum ammonium sulfate crystallization: at room temperature at 25°C, add 500g / L (NH 4 ) 2 SO 4 Solution, form ammonium aluminum sulfate crystallization precipitation, control the sulfate radical concentration in the solution at 20g / L.

[0025] Lead removal with barium salt: After dissolving ammonium aluminum sulfate crystals, add barium carbonate, and obtain pure ammonium aluminum sulfate after recrystallization...

Embodiment 2

[0027] Leaching: 1kg zinc leaching residue (Pb 65.7%), leaching agent is 350g / L aluminum chloride solution, reducing agent hydrogen peroxide dosage is 300mL, leaching temperature is 70℃, leaching time is 2h, liquid-solid ratio is 28.5:1. Lead leaching rate reaches 95.7%.

[0028] Replacement of lead: use aluminum block as the replacement agent, the replacement temperature is 30°C, the amount of aluminum block is 1 times the theoretical amount, and the replacement is for 1 hour to obtain a total of 627g of fine lead sludge with a lead content of 99.2%.

[0029] Aluminum ammonium sulfate crystallization: at room temperature at 25°C, add 500g / L (NH 4 ) 2 SO 4 Solution, form ammonium aluminum sulfate crystallization precipitation, control the sulfate radical concentration in the solution at 20g / L.

[0030] Lead removal with barium salt: After dissolving ammonium aluminum sulfate crystals, add barium carbonate, and obtain pure ammonium aluminum sulfate after recrystallization. ...

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Abstract

The invention provides a method of recovering lead from scrap lead-acid storage battery lead plaster, and belongs to the technical field of wet-process metallurgy. The method is characterized in that a reducing agent (FeCl2 or hydrogen peroxide) and lead plaster are added to an aluminum chloride solution, leaching is carried out in an agitating mill to allow lead in the lead plaster to enter the solution, lead in an extract is replaced by metallic aluminum, and after the lead is replaced, the original extract returns and lead slag is leached continuously. The method has the characteristics of short flow, few processes, low energy consumption and cost, and the like, and meets the environmental requirements of cleaning production.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for recovering lead from waste lead-acid storage battery lead paste. Background technique [0002] In the lead consumption structure, the lead consumption of lead-acid batteries accounts for about 85% of the total lead consumption. The output of lead-acid batteries in my country accounts for about 1 / 3 of the world's output, and more than 1.5 million tons of batteries are scrapped every year. The accumulation of waste batteries is increasing continuously and has become a huge renewable secondary resource. [0003] The lead grid produced by the crushing and sorting of waste lead-acid batteries can be cast into plates for reuse in battery factories after simple remelting and composition adjustment. Organic waste plastics can also be recycled after being washed. The composition of lead paste is complex, and the recovery technology is the most difficult. [0004] A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00H01M10/54
CPCC22B7/006C22B11/046H01M10/54Y02P10/20Y02W30/84
Inventor 王成彦陈永强邢鹏马保中
Owner UNIV OF SCI & TECH BEIJING
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