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Method for recycling waste lead-acid cells to directly produce lead oxide

A lead-acid battery, lead oxide technology, applied in the field of hydrometallurgy, can solve the problem of consuming large acid and alkali, and achieve the effect of improving recovery efficiency, significant environmental value, and shortening treatment process

Active Publication Date: 2013-04-03
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The first technical problem to be solved by the present invention is to avoid the disadvantage that the existing process needs acid dissolution first, and then through a large amount of alkali neutralization process, resulting in the consumption of a large amount of acid and alkali in the reaction process;

Method used

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  • Method for recycling waste lead-acid cells to directly produce lead oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Get 2 pieces of 12V, 12Ah ordinary electric vehicle waste lead-acid batteries purchased on the market, and the total weight of the battery pack is 9.2 kg. The specific implementation process is as follows:

[0060] 1) After conventional crushing and separation of waste lead-acid batteries, lead paste, grids, waste sulfuric acid, separators and casings are obtained.

[0061] 2) Put the lead paste filtered out into the crusher and ball mill in turn for crushing, and then sieve with a 60-mesh stainless steel screen. The larger lead paste particles continue to be transferred to the grinder for crushing until all the lead paste is completely through a sieve.

[0062] 3) The grids are placed in the crusher and ball mill in turn for crushing, and then sieved with a 20-mesh stainless steel screen, and the larger lead particles continue to be transferred to the crusher for crushing until all the lead particles pass through the screen for later use .

[0063] 4) Prepare 40L of...

Embodiment 2

[0070] Take a 12V, 45Ah waste automobile lead-acid battery, the total weight of the battery pack is 13.2 kg, the specific recycling process is as follows:

[0071] According to (1), (2) and (3) process of embodiment 1, obtain the broken lead paste and grid.

[0072] 4) Prepare 80L of NaOH solution with a concentration of 30% by weight, and at the same time dissolve 300 grams of antimony oxide solid in the NaOH solution as a catalyst, and place the solution for later use.

[0073] 5) Put 5 kg of lead paste in (2) and 3.5 kg of excess lead particles obtained in (3) into the above NaOH solution to make Pb and PbO 2 , and PbSO 4 React with NaOH, so that they are uniformly transformed into PbO, and dissolved in NaOH solution. During the reaction, the reaction temperature was kept at 100° C., and the stirring speed was 100 rpm.

[0074] 4) Filter after 2 hours of reaction to obtain a clear filtrate, a filter residue consisting of a small amount of residual lead powder and insolub...

Embodiment 3

[0079] Take the same waste automobile lead-acid battery as in Example 2, and follow the same (1), (2) and (3) process to obtain the broken lead paste and grid.

[0080] 4) Prepare 75L NaOH solution with a concentration of 28% by weight and place it in a sealed bucket for later use.

[0081] 5) Put 5 kg of lead paste in (2) process, and add 3.3 kg of excess lead pellets obtained in (3), and 200 g of commercially available antimony powder as a catalyst into the above NaOH solution to make Pb and PbO 2 , and PbSO 4 React with NaOH, so that they are uniformly transformed into PbO, and dissolved in NaOH solution. During the reaction, the reaction temperature was kept at 105° C., and the stirring speed was 80 rpm.

[0082] 4) Filter after 2 hours of reaction to obtain a clear filtrate, a filter residue consisting of a small amount of residual lead powder and insoluble impurities.

[0083] 7) The filtrate was placed in a crystallization tank for gradual cooling, and at the same ti...

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Abstract

The invention discloses a method for recycling waste lead-acid cells to directly produce lead oxide, belonging to the wet-process metallurgical field of recycling lead from lead-containing materials and waste lead-acid cells. The method for recycling waste lead-acid cells to directly produce lead oxide comprises the following steps of: carrying out a reaction on diachylum, lead powder and sodium hydroxide solution in the presence of catalyst to obtain a mixed solution containing NaHPbO2, sodium sulfate and sodium hydroxide, and un-reacted lead powder and impurities, and separating the mixed solution; cooling and filtering the mixed solution to obtain PbO crystals, and an alkaline solution containing Na2SO4 and the residual NaHPbO2; adding the NaOH to the solution, re-cooling the mixture to separate out sodium sulfate solid and obtain the NaOH solution containing the residual NaHPbO2; and carrying out re-dissolving-filtering-re-crystallizing to the PbO in the NaOH solution with mass concentration of 15-50% to obtain the pure lead oxide solid. The lead recovery ratio is generally between 98.5% and 99.2%, and the purity of the lead oxide is as high as 99.99% or higher.

Description

technical field [0001] The invention relates to a method for directly producing high-purity lead oxide by recycling waste lead-acid batteries, belonging to the field of hydrometallurgy for recycling lead from lead-containing materials and waste lead-acid batteries. Background technique [0002] Since the invention of the lead-acid battery by the French engineer Plante in 1859, the lead-acid battery has been widely used as a cheap and stable secondary battery in the fields of automobile ignition and telecommunication UPS power supply. In recent years, some emerging secondary batteries, such as lithium-ion batteries and nickel-hydrogen batteries, have competed, but lead-acid batteries have maintained a steady increase due to their unique cost-effective and safety advantages, and it still occupies the global secondary battery market. Nearly 60% of the output value of batteries. According to the statistics of power related industry associations, the global refined lead consumpt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/12C22B13/00C01G21/02
CPCY02P10/20
Inventor 潘军青宋爽孙艳芝
Owner BEIJING UNIV OF CHEM TECH
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