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Method for recovering lead from waste lead-acid storage batteries

A lead-acid battery and waste technology, applied in the direction of improving process efficiency, can solve the problems of environmental pollution, low recovery rate and high energy consumption, and achieve the effect of solving high energy consumption and improving recovery 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 method for reclaiming lead from waste lead-acid batteries, to solve the problems of high energy consumption, low recovery rate and environmental pollution in the prior art when reclaiming lead from waste lead-acid batteries Insufficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for recovering lead from waste lead-acid batteries, including the following steps:

[0022] (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 to a particle size of 10mm;

[0023] (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

[0024] (3) The lead sludge obtained in step (2) is oxidized and leached with nitric acid, the liquid-to-solid ratio is adjusted to 2, the concentration of nitric acid is 3M, the leaching temperature is 92°C, and the leaching time is 3h to obtain a leachate. Lead in the leachate The content is 180g / L;

[0025] (4) Add sodium sulfate to the leachate, stir and react for 1 hour at room temperature, and then press and filter for solid-liquid se...

Embodiment 2

[0030] A method for recovering lead from waste lead-acid batteries, including the following steps:

[0031] (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 to a particle size of 20mm;

[0032] (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

[0033] (3) The lead mud obtained in step (2) is oxidized and leached with nitric acid, the liquid-solid ratio is adjusted to 2-3, the concentration of nitric acid is 3-4M, the leaching temperature is 92-95°C, and the leaching time is 3-3.5h , Obtain a leachate, the content of lead in the leachate is 180-200g / L;

[0034] (4) Add sodium sulfate to the leachate, stir and react for 1h at room temperature, and then press and filter for solid-li...

Embodiment 3

[0039] A method for recovering lead from waste lead-acid batteries, including the following steps:

[0040] (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 to a particle size of 15mm;

[0041] (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

[0042] (3) The lead sludge obtained in step (2) is oxidized and leached with nitric acid, the liquid-to-solid ratio is adjusted to 2, the concentration of nitric acid is 4M, the leaching temperature is 93°C, and the leaching time is 3.3h to obtain a leachate. The lead content is 190g / L;

[0043] (4) Add sodium sulfate to the leachate, stir and react for 1h at room temperature, and then press filter for solid-liquid separation to obtain lea...

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Abstract

The invention discloses a method for recovering lead from waste lead-acid storage batteries. The method comprises the following steps: discharging waste acid of waste lead-acid storage batteries, breaking and sieving the waste lead-acid storage batteries, leaching obtained lead slime by virtue of nitric acid oxidation, carrying out a sulfuric acid reaction on obtained leachate, and carrying out a sodium carbonate reaction on obtained lead sulfate to obtain lead carbonate, decomposing the lead carbonate in a smelting furnace, adding pulverized coal, sodium carbonate and quartz sand to obtained lead oxide, and carrying out a high-temperature reaction to obtain refined lead. By leaching the lead slime by virtue of nitric acid oxidation and then preparing the lead sulfate by virtue of the sodium sulfate, the method disclosed by the invention can be used for effectively improving the recovery rate of lead in the lead-acid storage batteries to more than 96%; and by converting the lead sulfate into lead carbonate by virtue of sodium carbonate and preparing metallic lead from the lead carbonate, the method can be used for effectively solving the problems of high energy consumption, environmental pollution due to the emission of sulfur dioxide and the like in the case that the lead sulfate is directly decomposed.

Description

Technical field [0001] The present invention relates to the technical field of waste recovery, in particular to a method for recovering lead from 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 sulfuri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B13/00
CPCY02P10/20
Inventor 吴秀安
Owner ZUNYI JINSHI METAL ALLOY
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