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Process for treating waste lead acid storage battery

A lead-acid battery, waste technology, applied in the direction of battery recycling, process efficiency improvement, waste collector recycling, etc., can solve the problems of low recovery rate, high energy consumption, environmental pollution, etc., and achieve the effect of improving the conversion rate

Inactive Publication Date: 2015-03-25
ZUNYI JINSHI METAL ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, the purpose of the present invention is to provide a process for processing waste lead-acid batteries to solve the existing problems of high energy consumption, low recovery rate and environmental pollution in the prior art when recycling lead from waste lead-acid batteries. insufficient

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A process for processing waste lead-acid batteries, including the following steps:

[0018] (1) Punch holes at the bottom of the shelled waste lead-acid battery to discharge the waste acid, and then use a wet hammer crusher to crush the lead-acid battery. The particle size of the broken lead-acid battery is 10mm;

[0019] (2) Sieving the lead-acid battery fragments processed in step (1). The objects on the sieve are waste plastics, grids and connectors, and the objects under the sieve are lead mud. The lead mud is lead, lead oxide and sulfuric acid. Lead mixture

[0020] (3) The mass fraction of hydrogen peroxide is 52%, H 2 SO 4 With an acidic solution with a mass concentration of 90g / L, the lead sludge in step (2) is oxidized and leached once with the acidic solution, the liquid-solid ratio is adjusted to 1, the temperature is 80°C, and the time is 3h, and then the solution is pressure filtered. Obtain lead sulfate;

[0021] (4) Prepare the lead sulfate obtained in step (3) ...

Embodiment 2

[0023] A process for processing waste lead-acid batteries, including the following steps:

[0024] (1) Punch holes at the bottom of the shelled waste lead-acid battery to discharge the waste acid, and then use a wet hammer crusher to crush the lead-acid battery. The particle size of the broken lead-acid battery is 20mm;

[0025] (2) Sieving the lead-acid battery fragments processed in step (1). The objects on the sieve are waste plastics, grids and connectors, and the objects under the sieve are lead mud. The lead mud is lead, lead oxide and sulfuric acid. Lead mixture

[0026] (3) The mass fraction of hydrogen peroxide is 52%, H 2 SO 4 With an acidic solution with a mass concentration of 90g / L, the lead sludge in step (2) is oxidized and leached with the acidic solution for 1 to 2 times. The liquid-to-solid ratio is adjusted to 2, the temperature is 90°C, and the time is 5h, and then the solution is pressed Filter to obtain lead sulfate;

[0027] (4) Prepare the lead sulfate obtaine...

Embodiment 3

[0029] A process for processing waste lead-acid batteries, including the following steps:

[0030] (1) Punch holes at the bottom of the shelled waste lead-acid battery to discharge the waste acid, and then use a wet hammer crusher to crush the lead-acid battery. The particle size of the broken lead-acid battery is 15mm;

[0031] (2) Sieving the lead-acid battery fragments processed in step (1). The objects on the sieve are waste plastics, grids and connectors, and the objects under the sieve are lead mud. The lead mud is lead, lead oxide and sulfuric acid. Lead mixture

[0032] (3) The mass fraction of hydrogen peroxide is 52%, H 2 SO 4 With an acidic solution with a mass concentration of 90g / L, the lead sludge in step (2) is oxidized and leached twice with the acidic solution, the liquid-solid ratio is adjusted to 2, the temperature is 85°C, and the time is 4h, and then the solution is pressure filtered. Obtain lead sulfate;

[0033] (4) Prepare the lead sulfate obtained in step (3)...

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Abstract

The invention discloses a process for treating a waste lead acid storage battery. The process comprises the steps that waste acid of the waste lead acid storage battery is drained, crushed and screened to obtain lead mud; acid solutions are prepared then; the lead mud is oxidized and leached out by using the acid solutions; the solutions are subjected to press filtration; the obtained lead sulfate is put into an electrolytic cell for being subjected to electrolysis; collecting metal lead on a cathode. According to the process, lead mud is oxidized and leached out by using the acid solutions, lead inside the lead mud is oxidized into lead sulfate, and lead dioxide is reduced into lead sulfate, so that the conversion rate of the lead is greatly improved, the recovery rate of the lead reaches more than 97 percent, the lead sulfate solutions are electrolyzed to obtain metal lead; the prepared metal lead is relatively high in purity and the purity is more than 99.99 percent.

Description

Technical field [0001] The present invention relates to the technical field of waste recycling, in particular, to a process for processing waste lead-acid batteries. Background technique [0002] Used lead-acid batteries are composed of positive and negative plates, separators, shells, electrolyte and terminal posts. Used lead-acid batteries contain lead and its compounds, as well as metals and acid electrolytes such as mercury, cadmium, chromium and manganese. Once the solution enters the human body, it will damage the human nervous system, hematopoietic function and kidneys. The heavy metals decomposed by the lead-acid battery that is thrown away at will contain toxic waste liquid, which will destroy the ecological balance and endanger human health. my country produces 300,000 tons of waste lead-acid batteries every year. Usually, the lead mud produced from the recycling of waste lead-acid batteries is mainly composed of lead sulfate, lead oxide, lead dioxide and sulfuric acid....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54C22B7/00
CPCC22B7/007H01M10/54Y02P10/20Y02W30/84
Inventor 吴秀安
Owner ZUNYI JINSHI METAL ALLOY