Reducing method for lead dioxide in waste lead plaster

A technology of lead dioxide and waste lead paste, which is applied in the field of resource recycling, can solve problems such as high cost, easy decomposition, and secondary pollution, and achieve the effects of reducing energy consumption, reducing impurities, and increasing recovery rate

Inactive Publication Date: 2016-03-30
XIANGTAN UNIV
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  • Summary
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  • Application Information

AI Technical Summary

Problems solved by technology

The chlorine salt method produces chlorine gas in the reaction process, causing secondary pollution to the environment; the properties of hydrogen peroxide and sodium thiosulfate are unstable, easy to decompose during the reaction process, and consume a large amount; the reduction effect of sulfite is not good, and the reduction The rate is not high enough to affect the recovery rate of lead; Fe 2+ The reducing agent is more expensive, which increases the cost of reduction
[0005] PbO in current lead paste 2 The main research direction of reduction is wet treatment. The differences between the methods are mainly reflected in the selection of reducing agent and the subsequent treatment of the solution after reduction. These methods have their own advantages and disadvantages, but the cost remains high, which restricts to a certain extent. industrial applications

Method used

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  • Reducing method for lead dioxide in waste lead plaster

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Effect test

preparation example Construction

[0032] Preparation of calcium bisulfite suspension:

[0033] The calcium hydroxide suspension with a solid content of 15% was fed into commercially available sulfur dioxide or sulfur-containing flue gas, and reacted for 30 minutes under stirring at 100 rpm to prepare a 1.5 mol / L calcium bisulfite suspension for later use.

Embodiment 1

[0035] (1) Reduction reaction

[0036] Using NaHSO 3 As a reducing agent, weigh 10g of the prepared lead paste, add 100mL of water, mix well and add 3g of NaHSO 3 , add 10mL of 20% H 2 SO 4 When the stirring speed was 700 rpm, the reaction was carried out at room temperature for 90 min, and the product slurry was separated by filtration to obtain 102 mL of solution, 9 g of solid, and the reduction rate of lead dioxide was 92%.

[0037] (2) Regeneration reaction

[0038] Add 20ml of 1.5mol / L calcium bisulfite suspension to the 102mL solution obtained from the reduction reaction, react for 30min under stirring at 100rpm, filter the obtained solution for the preparation of lead plaster slurry, and collect and store the calcium sulfate filter cake.

Embodiment 2

[0040] (1) Reduction reaction

[0041] Take by weighing prepared lead plaster 10g, add the 102mL solution that obtains in the embodiment 1, add the H of 10mL20% 2 SO 4 The reaction was carried out at room temperature for 90 min at a stirring speed of 700 rpm, and the product slurry was filtered and separated to obtain 104 mL of solution, 9.2 g of solid, and the reduction rate of lead dioxide was 93%.

[0042] (2) Regeneration reaction

[0043]Add 20ml of 1.5mol / L calcium bisulfite suspension to the 104mL solution obtained from the reduction reaction, react for 30min under stirring at 100rpm, filter the obtained solution for the preparation of lead plaster slurry, and collect and store the calcium sulfate filter cake.

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Abstract

The invention discloses a reducing method for lead dioxide in waste lead plaster, and belongs to the recycling field of the lead dioxide in a waste lead storage battery. The waste lead plaster contains about 30% of PbO2, and during recycling, the PbO2 is required to be converted into bivalent lead (lead oxide or lead sulfate) for being recycled. According to the reducing method, sodium hydrogen sulfite is adopted as a reducing agent for PbO2 in the lead plaster, and sulfuric acid is used as an assistant for converting the PbO2 into lead surface and converting the sodium hydrogen sulfite into sodium sulfate. The sodium sulfate is regenerated into the sodium hydrogen sulfite by use of calcium hydrogen sulfite for being recycled for reducing reaction of PbO2 in the lead plaster, and an obtained byproduct calcium sulfate can be further comprehensively utilized. The calcium hydrogen sulfite for regenerating can be prepared from calcium hydroxide or sulfur dioxide in calcium carbonate absorbing smoke gas. The method has the advantages of being high in lead conversion rate and low in cost.

Description

technical field [0001] The invention relates to a method for reducing lead dioxide in waste lead paste, and belongs to the resource recycling field of recycling lead dioxide in waste lead storage batteries. Background technique [0002] Since 1859, the use of lead-acid batteries has a history of more than 150 years, and the technology is very mature. It is the most widely used chemical power source in the world. The substantial increase in the number of automobiles in the world has driven the rapid development of the lead-acid battery industry. Due to corrosion, passivation and other reasons, lead-acid batteries cannot be used after a certain number of years, so the amount of discarded lead-acid batteries every year also increases with the amount of lead-acid batteries. increase and increase. If these waste lead-acid batteries cannot be disposed of in a timely and effective manner, the lead-containing substances inside will cause serious pollution to the environment. There...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B13/00
CPCC22B7/006C22B13/045Y02P10/20
Inventor 张俊丰周文芳曹靖黄妍
Owner XIANGTAN UNIV
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