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Method for preparing high-quality red lead by lead slime of lead-acid batteries

A waste lead-acid battery, high-quality technology, applied to the removal of lead red, solid waste, lead oxide, etc., can solve the problems of lead dust escape labor intensity, high equipment investment, etc., to save metal lead resources and shorten roasting time , The effect of simple process

Inactive Publication Date: 2008-06-25
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this technology overcomes the shortcomings of using natural ventilation for oxidation in the prior art, which is easy to cause environmental pollution caused by the escape of lead dust and the labor intensity caused by manual stirring, the investment in equipment is relatively high.

Method used

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  • Method for preparing high-quality red lead by lead slime of lead-acid batteries
  • Method for preparing high-quality red lead by lead slime of lead-acid batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: After the lead slime is taken out from the storage battery, the anode and cathode are mixed together, washed repeatedly until neutral, then dried, and ground to 200-300 mesh powder. Dissolve 500 grams of sodium hydroxide and 40 grams of polyvinyl alcohol dispersant with a molecular weight of 120,000-150,000 in 3,100 grams of water, then add 1,000 grams of the above-mentioned lead mud powder, stir and react at 80°C for 2 hours, filter and separate, and use for filter cakes Wash with water repeatedly until neutral. After the obtained desulfurized lead-containing solid matter is dried, it is laid flat in a muffle furnace, the thickness of the flat bed is 5 cm, and it is fired at 470 ° C for 3 hours to obtain high-quality red lead. The lead recovery in the whole process is 95%, the content of the obtained lead peroxide (trilead tetraoxide) is as high as 97.99%. The product is tested and identified by X-ray diffraction (XRD) method, chemical analysis method accor...

Embodiment 2

[0027] Embodiment 2: the lead mud is dried after repeated washing to neutrality, and ground to 200-300 purpose powder; 150 grams of sodium hydroxide and 12 grams of polyvinyl alcohol dispersant with a molecular weight of 120000-150000 are dissolved in 2330 grams of water, and then Add 1000 grams of the above-mentioned lead slime powder, stir and react at 80°C for 2 hours, filter and separate, and wash the filter cake repeatedly with clear water until neutral. After the obtained desulfurized lead-containing solid matter is dried, it is laid flat in a muffle furnace with a thickness of 5 cm, and it is fired at 470 ° C for 3 hours, and the color of the obtained red lead is light red, and the crystal phase purity and color All worse than the red lead sample obtained in Example 1, the content of the obtained lead peroxide (trilead tetroxide) is only 84.07%.

Embodiment 3

[0028] Embodiment 3: Mud is dried after repeated washing to neutrality, and ground to 200-300 mesh powder; 1000 grams of sodium hydroxide and 50 grams of polyvinyl alcohol dispersant with a molecular weight of 120000-150000 are dissolved in 4100 grams of water, and then added 1000 grams of the above-mentioned lead slime powder, at a reaction temperature of 60°C and a reaction time of 6h, after the resulting desulfurized lead-containing solid matter is dried, it is laid flat in a muffle furnace with a thickness of 5 cm, and incubated at 470°C. Burn 3h, the obtained red lead sample is about 10 microns through particle size analysis average particle size, and the color of the obtained red lead is dark red, and the sample is identified through chemical analysis, and the obtained original high acid lead (trilead tetroxide) The content is only 92.45%.

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Abstract

The invention relates to a method for preparing high-quality red lead from lead slime of a waste lead-acid battery. The invention includes the following steps: the lead slime in the waste lead-acid battery is taken out and mixed with no regard of cathode and anticathode; then the lead slime is repeatedly washed to neutral and is dried and triturated to lead slime powder with granularity above 200 meshes; the lead slime powder is mixed with water solution containing dispersant and desulfurizer by a certain proportion; the mixture is adequately stirred and decarbolized under 25 to 90 DEG C for 1 to 24 hours; the liquid part is removed and the lead containing solids is washed to neutral; the material is tiled in a box style muffle furnace or a tube furnace to have a thickness of 1 to 20 cm and is roasted under temperature of 400 to 500 DEG C for 2 to12 hours; then the red lead is prepared. The invention method has the advantages of low preparation cost, high lead recycling ratio, high quality, lower energy consumption and lower environment pollution.

Description

technical field [0001] The invention relates to a method for preparing high-quality red lead from lead mud of waste lead-acid storage batteries through hydrometallurgy. Background technique [0002] With the rapid development of social economy, the demand for lead continues to increase, and the production process of lead products and the waste of lead resources and environmental pollution caused by waste are also intensified. Lead-acid batteries are the largest users of lead. In developed countries, the amount of lead used to manufacture lead-acid batteries accounts for more than 80% of the total lead consumption. In my country, it has also exceeded 50%, and its proportion is still increasing. With the development of industry and transportation, the amount of lead-acid batteries in my country is increasing, and the number of waste lead-acid batteries is also increasing. At present, nearly 1 million tons of waste lead-acid batteries are produced in my country every year, but...

Claims

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Application Information

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IPC IPC(8): C01G21/08C01G21/10B09B3/00
Inventor 晁自胜刘奇张弦吴莲萍黄彩娟
Owner HUNAN UNIV
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