Pretreatment method for lead plaster of waste lead-acid accumulators

A waste lead-acid battery, pretreatment technology, applied in battery recycling, waste collector recycling, recycling technology, etc., can solve the impact of wet lead recycling process, incomplete separation of lead paste and other components, no technology, etc. problem, to achieve the effect of small investment, low production cost and high impurity removal efficiency

Active Publication Date: 2013-04-17
HUAZHONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when sorting the broken products of waste lead-acid batteries, the separation of lead paste and other components is not complete, and plastic shell and grid fragments, diaphragm paper, fibers, carbon black, etc. will be mixed into the lead paste. Recycling process will have serious impact
However, there is no relevant technology and research

Method used

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  • Pretreatment method for lead plaster of waste lead-acid accumulators
  • Pretreatment method for lead plaster of waste lead-acid accumulators

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The waste lead-acid battery is broken and separated to obtain the waste lead paste. Take 10.0 kg of lead paste for waste lead-acid batteries, and sieve it with a 0.85 mm sieve to obtain 2.1 kg of the product on the sieve and 7.9 kg of the product under the sieve. The product under the sieve is re-selected with a shaking table to obtain 0.4 kg of diaphragm paper and 7.5 kg of pure lead paste. Add 37.5L of water, 18kg of citric acid, 13.5kg of sodium citrate, and 2.25kg of hydrogen peroxide to the obtained pure lead paste, stir and leach for 4 hours at room temperature, and filter to obtain lead citrate. Calcined lead citrate in a muffle furnace at 350°C for 1 hour to obtain 5.4kg of lead powder. Lead powder can be directly used to prepare lead-acid batteries. After calculation, the removal rate of waste lead plaster impurities is 99.1%.

Embodiment 2

[0031]Take 5kg of waste lead-acid battery lead paste from a company in Hubei, and sieve it with a 0.25mm sieve to obtain 1.1kg of the product on the sieve and 3.9kg of the product under the sieve. The product under the sieve is re-selected with a shaking table to obtain 0.2 kg of diaphragm paper and 3.7 kg of pure lead paste. Add 37L of water and 2.22kg of sodium carbonate to the pure lead paste, and after leaching for 1 hour, add 2.59kg of citric acid, leaching for 1 hour, and filter to obtain lead citrate. Roast lead citrate in a muffle furnace at 375°C for 2 hours to obtain 2.8kg of lead powder. Lead powder can be directly used to prepare lead-acid batteries. After calculation, the removal rate of waste lead plaster impurities is 99.2%.

Embodiment 3

[0033] Take 15kg of waste lead-acid battery lead paste from a certain company, and sieve it with a 0.106mm sieve to obtain 2.4kg of the product on the sieve and 12.6kg of the product under the sieve. The product under the sieve is re-selected with a shaking table to obtain 0.4 kg of diaphragm paper and 12.2 kg of pure lead paste. Add 61L of water and 4.27kg of acetic acid to the pure lead paste, stir and leach for 6 hours at room temperature, then add 19.5kg of sodium citrate and 7.32kg of hydrogen peroxide, stir and leach for 4 hours at room temperature, and filter to obtain lead citrate. Roast lead citrate in a muffle furnace at 360°C for 3 hours to obtain 9.1kg of lead powder. Lead powder can be directly used to prepare lead-acid batteries. After calculation, the removal rate of waste lead plaster impurities is 99.1%.

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Abstract

The invention belongs to the field of utilizing waste lead-acid accumulators to produce secondary lead, and relates to a novel pretreatment method for lead plaster of the waste lead-acid accumulators. The pretreatment method comprises the steps that after the waste lead-acid accumulators are crushed and subjected to preliminary separation, waste lead plaster is obtained; wet sieving or dry sieving is conducted on the waste lead plaster by a 0.85mm-0.106mm sieve; plate grid and plastic fragment products are obtained; table reconcentration is conducted on undersize products; diaphragm paper products and pure lead plaster are obtained; the plate grid and plastic fragment products and the diaphragm paper products can enter a fire smelting system; the pure lead plaster is treated by a citric acid aqueous solution or sodium carbonate or a new acetic acid leaching technology; and lead powder is obtained, and can be used for preparing the lead-acid accumulators directly. The pretreatment method for the lead plaster of the waste lead-acid accumulators is simple in technological equipment, low in investment, low in cost, high in impurity removal rate, clean, highly-efficient and energy-saving.

Description

technical field [0001] The invention belongs to the field of producing regenerated lead from waste lead-acid batteries. The invention relates to a novel pretreatment method for lead paste of waste lead-acid batteries. Background technique [0002] Lead-acid batteries have always occupied a dominant position in the secondary battery industry. According to statistics, from 2005 to 2010, my country's lead-acid batteries accounted for more than 50% of the secondary battery market indicators in terms of output value and sales in the field of power batteries. With the rapid development of my country's economy, especially the rapid development of the automobile, motorcycle, and electric bicycle industries, the output of lead-acid batteries is increasing at a rate of 10% per year. [0003] The larger the production volume of lead-acid batteries, the more scrapped lead-acid batteries. According to statistics, in 2007, the production of waste lead-acid batteries in my country was ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54
CPCY02W30/84
Inventor 杨家宽何东升刘建文朱新峰朱静胡雨辰张伟孙晓娟王琴袁喜庆
Owner HUAZHONG UNIV OF SCI & TECH
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