Method for recovering lead oxide from waste lead plaster

一种氧化铅、铅膏的技术，应用在一氧化铅、氧化铅、废物收集者回收等方向，能够解决除杂效果差、重结晶次数多等问题，达到工艺过程环保、原子经济性高的效果

Active Publication Date: 2014-11-12
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0027] The second technical problem to be solved by the present invention is to provide a novel lead oxide purification process to overcome the poor impurity removal effect and recrystallization of amphoteric metals such as Sn, Al and Sb when the existing lead oxide crude product adopts NaOH dissolution-recrystallization process The disadvantage of many times

Method used

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  • Method for recovering lead oxide from waste lead plaster

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Effect test

Embodiment 1

[0079] Take commercially available waste valve-regulated sealed lead-acid batteries with specifications of 12V and 7Ah and crush and separate them by conventional methods to obtain lead paste. After obtaining the total amount of lead sulfate in the lead paste through traditional chemical titration analysis, then add stoichiometric 10% NaOH as lye, control the treatment temperature at 35°C, the treatment time is 10min, and the stirring speed is 100 rpm. After the lead plaster is treated with lye, the solid-liquid separation is carried out to obtain the pre-desalted lead paste and the desalted mother liquor mainly composed of sodium sulfate. The process is as follows:

[0080] a. Add 1 kg of the pre-desalted lead paste into the 10L first reactor, add 0.6 kg of lead powder obtained by conventional crushing of excessive lead-containing grids to the reactor, 8 g of cobalt oxide as a catalyst, and a sufficient amount of 0.5 mol / L arginine aqueous solution was used as a complexing a...

Embodiment 2

[0085]Use 12% KOH solution instead of the pre-desalted lye, and the desalination treatment temperature is 40°C. In the step a, the complexing agent is changed to 0.75mol / L ethylenediamine aqueous solution, and the catalyst is changed to copper oxide 13g, and in the step b, the CO 2 change to SO 2 , the rest are consistent with Example 1, the PbO purity finally obtained is 99.97%, and the comprehensive recovery rate of lead is 99.6%.

Embodiment 3

[0087] In the step a, the complexing agent is changed to 1mol / L ethylenediamine diacetic acid aqueous solution, and the catalyst is changed to silver nitrate 5g, and in the step b, the CO 2 change to SO 3 , the rest are consistent with Example 1, the PbO purity finally obtained is 99.96%, and the comprehensive recovery rate of lead is 99.5%.

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Abstract

The invention provides a method for recovering lead oxide from waste lead plaster. The method comprises the following steps: a, dissolving pre-desalted lead plaster by using a complexing agent solution, and reacting all PbOs with a complexing agent to generate complexing ions so as to obtain a lead-containing solution and filter residues; b, adding a precipitating agent into the lead-containing solution, reacting the precipitating agent with the lead complexing ions to generate lead salt precipitation and the regenerated complexing agent; and c, roasting the lead salt precipitation to obtain lead oxide, and regenerating the precipitating agent. The method can be widely suitable for lead plaster formed by mixing various sources, the process conditions are relatively mild, a process is relatively environment-friendly, and the final recovery rate of lead oxide can reach more than 99%, so that the method has very high application values in the industry of recovery treatment of waste lead-acid batteries.

Description

technical field [0001] The invention belongs to the technical field of clean recovery and regenerated lead of waste lead-acid batteries. Background technique [0002] Due to the advantages of low price, high safety and reliable technology, lead-acid batteries have been widely used in automobiles, UPS, mobile communication equipment and other fields. At the same time, with the rapid development of China's automobile consumption in recent years and the EU's promotion of blue-drive vehicles with automatic start-stop technology, it can be predicted that the production of lead-acid batteries will continue to grow for a long period of time in the future. According to statistics, my country's refined lead output reached 4.646 million tons in 2012, of which about 3.3 million tons were used to manufacture lead-acid batteries. With the increasing scarcity of primary lead ore resources, waste lead-acid batteries are increasingly becoming the main raw material for the secondary lead in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B13/00H01M10/54
CPCC01G21/06C01G21/14C01P2006/80C22B7/006C22B13/045H01M4/56H01M10/06H01M10/54Y02E60/10Y02P10/20Y02W30/84
Inventor 潘军青边亚茹孙艳芝钮因键
Owner BEIJING UNIV OF CHEM TECH
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