Method for producing nanometer lead oxide through clean transformation-microwave pyrolysis of lead sulfate paste

A lead sulfate and lead oxide technology, applied in the directions of lead monoxide, lead oxide, chemical instruments and methods, can solve the problems of environmental protection and green cleaning in the whole process without retrieval, and achieve direct productization, low thermal resistance, The effect of reducing exposure to high temperatures

Inactive Publication Date: 2020-02-04
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem of recycling lead sulfate paste, there is currently no search for a technica...

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  • Method for producing nanometer lead oxide through clean transformation-microwave pyrolysis of lead sulfate paste
  • Method for producing nanometer lead oxide through clean transformation-microwave pyrolysis of lead sulfate paste
  • Method for producing nanometer lead oxide through clean transformation-microwave pyrolysis of lead sulfate paste

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Embodiment 1

[0045] This embodiment provides a method for producing lead oxide nanometer by microwave pyrolysis, which is clean transformation of lead sulfate paste, and its process flow chart is as attached figure 1 As shown, it specifically includes the following steps:

[0046] S1. Solution transformation: Weigh 200g of lead sulfate paste, mix it evenly and finely grind it until the particle size is below -100 mesh. Add 1200mL transformation solution according to the liquid-solid ratio of 6:1, in which the concentration of tartrate group is 80g / L, and the molar concentration ratio of tartaric acid and sodium tartrate is 1:1. After raising the temperature to 50°C, add 4g of starch, keep warm and react for 2 hours, then filter and separate the eluate and insoluble matter to obtain eluate 1166mL, the dry weight of insoluble matter is 238.06g, the conversion rate of lead is calculated to be 97.38%, and the sulfur content in the solution is measured It is 9.48g / L, and the calculated desulfu...

Embodiment 2

[0049] This embodiment provides a method for producing lead oxide nanometer by microwave pyrolysis, which is clean transformation of lead sulfate paste, and its process flow chart is as attached figure 1 Shown, present embodiment is as the lead sulfate plaster of test raw material and auxiliary material with embodiment 1, specifically comprises the following steps:

[0050] S1. Solution transformation: Weigh 200g of lead sulfate paste, mix well and finely grind until the total particle size is below -150 mesh. Add 1000mL transformation solution according to the liquid-solid ratio of 5:1, in which the concentration of tartrate group is 80g / L, and the molar concentration ratio of tartaric acid and sodium tartrate is 1:1.5. After raising the temperature to 70°C, add 6g of starch, keep warm and react for 1h, then filter and separate the eluate and insoluble matter to obtain eluate 952mL, the dry weight of insoluble matter is 241.56g, the conversion rate of lead is calculated to be...

Embodiment 3

[0053] This embodiment provides a method for producing lead oxide nanometer by microwave pyrolysis, which is clean transformation of lead sulfate paste, and its process flow chart is as attached figure 1 Shown, present embodiment is as the lead sulfate plaster of test raw material and auxiliary material with embodiment 1, specifically comprises the following steps:

[0054] S1. Solution transformation: Weigh 500g of lead sulfate paste, mix it evenly and finely grind it until the particle size is below -200 mesh. Add 2000mL transformation solution according to the liquid-solid ratio of 4:1, in which the concentration of tartrate group is 80g / L, the ratio of molar concentration of tartaric acid to sodium tartrate is 1:1.5, after heating up to 50°C, add 10g of starch, keep warm and react for 4h, then filter Separate eluate and insoluble matter to obtain eluate 1947mL, dry weight of insoluble matter 601.64g, the calculated lead conversion rate is 98.63%, the sulfur content in the ...

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Abstract

The invention belongs to the technical field of resource circulation and material metallurgy, and particularly discloses a method for producing nanometer lead oxide through clean transformation-microwave pyrolysis of lead sulfate paste. A purpose of the invention is to solve the problem of difficult recovery of lead sulfate paste disassembled from the waste lead storage battery. According to the invention, clean and non-toxic tartaric acid/sodium and starch are respectively used as a transformation agent and a reducing agent; a high-activity lead tartrate precursor is obtained after solution reaction desulfurization; and thermal decomposition is performed under the penetration effect of microwaves to produce nanometer lead oxide, the nanometer lead oxide can be recycled as a high-performance lead storage battery production raw material, and tail gas is decomposed into oxycarbide and water vapor so as to be directly discharged. According to the invention, the method has characteristicsof clean and environment-friendly process and waste recycling, realizes the efficient resource recovery of waste lead sulfate paste, and is easy to carry out industrial production.

Description

technical field [0001] The invention belongs to the technical field of resource recycling and metallurgy of non-ferrous metal materials, and more specifically relates to a method for producing lead oxide nanometer by microwave pyrolysis for clean transformation of lead sulfate paste. Background technique [0002] Lead-acid batteries are widely used in starting power supplies, base station energy storage, electric vehicles and many other fields. China is the largest consumer of lead-acid batteries in the world. After lead-acid batteries are scrapped, a large amount of lead sulfate paste is produced, of which lead-containing accounts for 50%. More than % is an important lead resource. With the depletion of lead mines, the recovery of lead storage batteries is particularly important. [0003] After the waste lead-acid battery is disassembled, the lead is mainly concentrated in the lead sulfate paste. The current recycling methods include fire method, combined method, and full w...

Claims

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Application Information

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IPC IPC(8): C01G21/06B82Y40/00H01M10/54
CPCB82Y40/00C01B2203/042C01G21/06C01P2002/72C01P2004/03C01P2004/64C01P2006/10H01M10/54Y02W30/84
Inventor 叶龙刚欧阳臻刘凌博胡宇杰夏志美肖利
Owner HUNAN UNIV OF TECH
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