Method for preparing high quality lead dioxide with plumbum mud in waste lead acid accumulator

A lead dioxide, high-quality technology, applied in the direction of lead dioxide, lead oxide, etc., can solve the problems of low purity of lead dioxide, complex equipment, lead slime utilization, etc., to save metal lead resources, less electricity consumption, The effect of low production cost

Inactive Publication Date: 2008-12-10
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] As can be seen from the above analysis, the lead dioxide preparation method reported in the current patent either directly prepares lead dioxide by electrolysis, but due to the use of pure lead raw materials, its cost is very high; The lead dioxide contained in the anode of the acid battery is recovered and recycled, but the purity of the obtained lead dioxide is very low, the activity is poor, and the equipment is complicated, and the lead sludge in the waste lead-acid battery has not been utilized

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  • Method for preparing high quality lead dioxide with plumbum mud in waste lead acid accumulator

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The lead slime is taken out from the storage battery, washed repeatedly until neutral, then dried, ground to 200-300 mesh powder, and set aside. Dissolve 250 grams of sodium hydroxide and 20 grams of 12,000-15,000 polyvinyl alcohol dispersant in 2,600 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 filter the cake with water repeatedly. Wash until neutral. Dry the lead sludge obtained after desulfurization, add saturated sodium hypochlorite solution (available chlorine > 10%), the solid-to-liquid ratio (lead dioxide: sodium hypochlorite solution) is 1:4, stir and react at 80°C for 2 hours, take out, and filter and separate , then dry. The obtained solid powder sample is identified by XRD and confirmed to be lead dioxide; and identified by chemical analysis, the content of the obtained lead dioxide is 92.43%. The recovery rate of lead in the whole process is 94%. The particle siz...

Embodiment 2

[0033] The lead slime is washed repeatedly until neutral, then dried, and ground to 200-300 mesh powder. Dissolve 250 grams of sodium hydroxide and 20 grams of 12,000-15,000 polyvinyl alcohol dispersant in 2,600 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 wash the filter cake repeatedly with clean water until neutral. After the obtained desulfurized lead hydroxide is dried, add saturated sodium hypochlorite solution, the solid-to-liquid ratio (lead dioxide: sodium hypochlorite solution) is 1:4, stir and react at 25°C for 24 hours, take it out, separate by filtration, and then dry. The obtained solid powder sample was identified by XRD and confirmed to be lead dioxide. The sample is identified through chemical analysis, and the obtained lead dioxide content reaches 88.18%, the recovery rate of lead in the whole process reaches 93%, and the particle size is about 20 microns.

Embodiment 3

[0035] After repeatedly washing the lead mud to neutrality, dry it, grind it to 200-300 mesh powder, dissolve 331 grams of sodium carbonate and 20 grams of 12000-15000 polyvinyl alcohol dispersant in 2700 grams of water, and then add 1000 grams of the above-mentioned lead mud powder , stirred and reacted at 60° C. for 6 hours, separated by filtration, and the filter cake was repeatedly washed with water until neutral. After the obtained desulfurized lead slime is dried, add saturated sodium hypochlorite solution, the solid-to-liquid ratio (lead dioxide: sodium hypochlorite solution) is 1:4, stir and react at 60°C for 6 hours, filter and separate, and then dry. The obtained solid powder sample was identified by XRD and confirmed to be lead dioxide. The sample is identified through chemical analysis, and the obtained lead dioxide content reaches 91.17%, the recovery rate of lead in the whole process reaches 95%, and the particle size is about 20 microns.

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Abstract

The invention relates to a method for preparing high-quality lead dioxide through lead slime of waste lead acid storage batteries, comprising the following steps that: the lead slime in the waste lead acid storage batteries is taken out, washed repeatedly to neutrality, dried, and crushed into lead slime powder the granularity of which is over 200 meshes; the lead slime powder is mixed with a water solution which contains a dispersant and a desulfurizer according to a certain proportion, and then the mixture is fully stirred and desulfurized for 1 to 24 hours at a room temperature of 90 DEG C; separation is performed to remove a liquid part, and lead-bearing solid materials obtained are fully dried; the lead-bearing solid materials are mixed with a water solution which contains oxidant according to a certain proportion, and the mixture is fully stirred and oxidized for 1 to 2 hours at a room temperature of 90 DEG C; and separation is performed to remove a liquid part, and a solid part obtained is the lead dioxide after washing and drying. The method prepares the lead dioxide through the lead slime in the waste lead acid storage batteries, and has low cost and energy consumption, simple equipment, and high lead recovery rate and product quality of the lead dioxide.

Description

technical field [0001] The invention relates to a method for preparing high-quality lead dioxide from lead slime in waste lead-acid batteries. Background technique [0002] Lead occupies an important position in the development of the national economy, and is one of the most widely used non-ferrous metals. Lead is a resource in short supply worldwide, especially in my country. Lead is also one of the toxic heavy metals, and lead pollution has become a global environmental problem. [0003] With the rapid development of social economy, the demand for lead continues to increase, and the problems of waste of lead resources and environmental pollution caused by the production process of lead products and the use and disposal of lead products are also intensified. Lead-acid batteries are the largest users of lead. In developed countries, the amount of lead used to make lead-acid batteries accounts for more than 80% of the total lead consumption. In my country, it has also excee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G21/08
Inventor 晁自胜刘奇刘少友贺浩黄彩娟
Owner HUNAN UNIV
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