Method for recovering lead from waste lead storage battery

The technology of a waste lead storage battery and a recovery method is applied in the field of lead recovery and lead recovery in waste lead storage batteries, which can solve the problems of low lead recovery rate, aggravated environment and high energy consumption, and achieves high vertical recovery rate and low smoke dust rate. , the effect of low melting temperature

Inactive Publication Date: 2015-07-08
NANJING HUANHONG RESOURCE REGENERATION SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The most common one is pyroprocessing. The melting temperature in the processing process is generally above 1200°C. The energy consumption is high, the lead recovery rate is low, and a large amount of pollutants such as sulfur dioxide, lead vapor, and dust will be produced, which will inevitably aggravate the process. environmental pollution

Method used

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  • Method for recovering lead from waste lead storage battery

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Effect test

Embodiment 1

[0022] Such as figure 1 Shown, the concrete steps of the recovery method of lead in waste lead storage battery of the present invention are as follows:

[0023] 1. Transport the waste lead-acid battery to the dismantling machine to remove the shell and remove the waste acid inside; then send it to the dryer for drying treatment to remove the moisture inside the waste lead-acid battery;

[0024] 2. Use a hammer crusher to crush the dried waste lead-acid batteries to a particle size of 4-9mm;

[0025] 3. Sieve the waste lead-acid battery fragments, the sieve is waste plastics, grids and connectors, the sieve is waste lead paste, and the lead paste is a mixture of lead, lead oxide and lead sulfate;

[0026] 4. Oxidatively leaching the waste lead paste with nitric acid to obtain a leachate, the content of lead in the leachate is 210g / L; the concentration of nitric acid is 3M, the leaching temperature is 93°C, and the leaching time is 150min;

[0027] 5. Add sodium sulfate to...

Embodiment 2

[0033] The concrete steps of the recovery method of lead in waste lead storage battery of the present invention are as follows:

[0034] 1. Transport the waste lead-acid battery to the dismantling machine to remove the shell and remove the waste acid inside; then send it to the dryer for drying treatment to remove the moisture inside the waste lead-acid battery;

[0035] 2. Use a hammer crusher to crush the dried waste lead-acid batteries to a particle size of 4-9mm;

[0036] 3. Sieve the waste lead-acid battery fragments, the sieve is waste plastics, grids and connectors, the sieve is waste lead paste, and the lead paste is a mixture of lead, lead oxide and lead sulfate;

[0037] 4. Oxidatively leaching waste lead paste with nitric acid to obtain a leach solution, the content of lead in the leach solution is 230g / L; the concentration of nitric acid is 4M, the leaching temperature is 94°C, and the leaching time is 170min;

[0038] 5. Add sodium sulfate to the leachate obt...

Embodiment 3

[0044] The concrete steps of the recovery method of lead in waste lead storage battery of the present invention are as follows:

[0045] 1. Transport the waste lead-acid battery to the dismantling machine to remove the shell and remove the waste acid inside; then send it to the dryer for drying treatment to remove the moisture inside the waste lead-acid battery;

[0046] 2. Use a hammer crusher to crush the dried waste lead-acid batteries to a particle size of 4-9mm;

[0047] 3. Sieve the waste lead-acid battery fragments, the sieve is waste plastics, grids and connectors, the sieve is waste lead paste, and the lead paste is a mixture of lead, lead oxide and lead sulfate;

[0048] 4. Oxidatively leaching waste lead paste with nitric acid to obtain leachate, the content of lead in the leachate is 220g / L; the concentration of nitric acid is 5M, the leaching temperature is 96°C, and the leaching time is 200min;

[0049] 5. Add sodium sulfate to the leachate obtained, the amo...

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Abstract

The invention discloses a method for recovering lead from a waste lead storage battery, belonging to the field of nonferrous metal smelting. The method comprises the steps of shelling the waste lead storage battery, discharging waste acid, and crushing and sieving after carrying out drying treatment to obtain waste lead paste; carrying out oxidation leaching on the waste lead paste to obtain leachate; after reacting by adding sodium sulfate into the leachate, carrying out solid-liquid separation to obtain lead sulfate; desulfurizing lead sulfate to obtain lead carbonate; smelting lead carbonate to obtain lead oxide; and adding iron sand into lead oxide, and introducing oxygen-enriched air to smelt to obtain refined lead. By using the method, the recovery rate of lead is up to more than 92%; and the method is low in smelting temperature, low in lead volatilization, low in dust yield, high in direct lead recovery rate and capable of greatly reducing energy consumption, reducing the emission of sulfur dioxide, waste liquid and the like and avoiding secondary pollution so as to conform to the national environment protection policy. The purity of the refined lead can be greatly improved by adding the iron sand of which the amount is 5-6% of the amount of lead oxide in the smelting process.

Description

technical field [0001] The invention relates to a method for recovering lead, in particular to a method for recovering lead in waste lead storage batteries, belonging to the field of nonferrous metal smelting. Background technique [0002] With the increase in the number of automobiles, electric vehicles and electric bicycles, the lead-acid battery industry has developed rapidly, people's demand for lead-acid batteries is increasing, and the number of waste lead-acid batteries produced every year is also increasing. The high cost and the environmental pollution caused by waste lead-acid batteries have also attracted more and more attention. technical research. [0003] In the prior art, there are many methods for recovering lead from waste lead plaster, including fire method, wet method, dry-wet combined method and other processes. The most common one is pyroprocessing. The melting temperature in the processing process is generally above 1200°C. The energy consumption is h...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B13/00H01M10/54
CPCY02P10/20Y02W30/84
Inventor 黄鹏
Owner NANJING HUANHONG RESOURCE REGENERATION SCI & TECH CO LTD
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