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Method for preparing pure lead from lead paste of waste lead acid battery

A lead-acid battery and lead paste technology, applied in the field of resource recovery and utilization technology, can solve the problems of cumbersome process, high cost, long process, etc., and achieve the effects of simple process, low preparation cost and good quality

Inactive Publication Date: 2017-09-26
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fire method-electrolysis method is to firstly desulfurize the lead paste, then smelt it at low temperature to obtain crude lead, and then electrolyze the crude lead to produce refined lead; the wet method-electrolysis method is to first reduce and extract the lead in the lead paste, and then electrolyze and wet the lead after obtaining the lead solution. There are two methods to deal with it, but these two methods are to obtain crude lead first, and then refine the crude lead by electrolysis, the process is long, the process is cumbersome, and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) The lead plaster after crushing and separating the waste lead-acid batteries and the equimolar amount of sodium carbonate are prepared into a slurry, the lead sulfate in the lead plaster is converted into lead carbonate, and the lead-containing filter cake is obtained by pressure filtration;

[0029] (2) In the lead-containing filter cake obtained in step (1), add a polyvinyl alcohol solution (mass fraction of 1.5%) twice the mass of the lead-containing filter cake to make a slurry, apply it to a stainless steel plate, and dry it. Obtain lead plaster plate;

[0030] (3) Using the lead plaster plate obtained in step (2) as the cathode and the graphite plate as the anode, electrolyze in a 20% tetrafluoroboric acid solution to obtain refined lead with a purity of 99.995%.

Embodiment 2

[0032] (1) The lead paste after crushing and separation of waste lead-acid batteries and 1.1 times the molar amount of ammonium bicarbonate are prepared into a slurry, the lead sulfate in the lead paste is converted into lead carbonate, and the lead-containing filter cake is obtained by pressure filtration;

[0033] (2) In the lead-containing filter cake obtained in step (1), add a polyvinyl alcohol solution (1.0% by mass fraction) of 3 times the mass of the lead-containing filter cake to make a slurry, apply it to a stainless steel plate, and dry it. Obtain lead plaster plate;

[0034] (3) Using the lead paste plate obtained in step (2) as the cathode and the graphite plate as the anode, electrolyze in a 30% hexafluorosilicate solution to obtain refined lead with a purity of 99.991%.

Embodiment 3

[0036] (1) Prepare lead plaster after crushing and separating waste lead-acid batteries and 1.1 times the molar amount of ammonium carbonate into a slurry, convert lead sulfate in the lead plaster into lead carbonate, press filter, and obtain lead-containing filter cake;

[0037] (2) In the lead-containing filter cake obtained in step (1), add polyvinyl alcohol solution (mass fraction: 1.0%) equal to the quality of the lead-containing filter cake to make a slurry, apply it to a graphite plate, and dry it to obtain lead plaster plate;

[0038] (3) Using the lead paste plate obtained in step (2) as the cathode and the graphite plate as the anode, electrolyze in an acetic acid solution with a mass fraction of 20% to obtain refined lead with a purity of 99.993%.

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PUM

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Abstract

The invention relates to a method for preparing pure lead from lead paste of a waste lead acid battery. The method provided by the invention comprises the following steps: (1) adding a desulfurizing agent into the lead paste and carrying out pre-desulfurization; (2) after carrying out the pre-desulfurization, adding a paste preparation agent into a lead-containing mixture, preparing the paste and coating the a sheet material with the paste; drying the sheet material to prepare a pole plate; (3) taking the pole plate as a cathode and electrolyzing to prepare metal lead; (4) heating and melting the lead to prepare a lead ingot or directly pressing the lead into the lead ingot. The method provided by the invention has a simple process and electrolyte can be circularly utilized; recycling utilization of the waste lead acid battery can be realized and recycled pure lead has high purity and good quality; the preparation cost is low and the economic benefits are good, so that the method has very good industrial application value.

Description

technical field [0001] The present invention belongs to resource recovery and utilization technology, and in particular relates to a method for obtaining high-purity lead obtained from lead paste after crushing and separation of waste lead-acid batteries. The process can realize solid electrolysis of lead paste, so that the process has operational Features of simplicity and good economy. Background technique [0002] Lead-acid batteries are widely used in automobiles, electric vehicles, submarines, mobile communication base stations, etc. my country is the world's largest producer, consumer and exporter of lead-acid batteries. About 110 million waste lead-acid batteries are produced in my country every year, and the amount of lead metal is about 2 million tons. How to efficiently and cleanly recycle lead in waste lead-acid batteries has become a major technical demand. Among them, after waste lead-acid batteries are broken and separated The preparation of refined lead is the...

Claims

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Application Information

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IPC IPC(8): H01M10/54C25C1/18
CPCC25C1/18H01M10/54Y02P10/20Y02W30/84
Inventor 曹靖张俊丰黄妍王超
Owner XIANGTAN UNIV