Method for preparing lead oxide by means of scrap lead paste

A technology of lead oxide and waste lead paste is applied in the directions of lead oxide and process efficiency improvement, which can solve the problems of high industrial production cost and large consumption of chemical reagents, and achieves low synthesis cost, high consistency, and synthesis cycle. short effect

Inactive Publication Date: 2020-05-19
CHAOWEI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to overcome the problems of relatively large consumption of chemical reagents and high industrial production costs in the process of preparing lead oxide from waste lead paste in the prior art, and provides a method for preparing lead oxide from waste lead paste. The method is an efficient , high cleanliness, low consumption, low cost, simple process and good controllability, and high-efficiency method for preparing high-purity lead oxide from waste lead paste

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  • Method for preparing lead oxide by means of scrap lead paste
  • Method for preparing lead oxide by means of scrap lead paste
  • Method for preparing lead oxide by means of scrap lead paste

Examples

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Embodiment 1

[0034] A method for preparing lead oxide from waste lead plaster, comprising the following preparation steps:

[0035] (1) Dissolving and leaching of lead paste: Put 500g of waste lead paste, 3500g of hydrochloric acid with a mass content of 25% and sodium chloride with a mass content of 5% into an enamel reactor and heat it to 100°C for 2 hours. The dissolution rate of lead ion after the one-step reaction is 61.3%. After the reaction is completed, it is filtered and separated at 70° C., and the filter residue is 243.4 g for later use. The filtrate is cooled and crystallized to separate out pure lead chloride crystals, and the lead chloride is collected by centrifugation, and the filtrate is recycled.

[0036] (2) Dissolution and leaching of the filter residue: the filter residue was sampled to detect that the mass content of lead sulfate was 76.8%, and the water content of the filter residue was 22.6%. Put 243.4g of the filter residue and 1500g of 15% sodium chloride solution ...

Embodiment 2

[0042] The difference with Example 1 is that the following preparation steps are included:

[0043] (1) Dissolving and leaching of lead plaster: Put 500g of waste lead plaster, 2000g of 18% hydrochloric acid by mass content and 3% sodium chloride by mass content into an enamel reactor, heat it to 80°C and keep it warm for 1.5h, then titrate with EDTA Monitor the dissolving rate of the lead ion after the first step reaction to be 62.7%. After the reaction is completed, it is filtered and separated at 68°C. The filter residue is 237.4g for subsequent use.

[0044] (2) Dissolution and leaching of filter residue: filter residue sampling detects that the mass content of lead sulfate is 74.6%, and the water content of filter residue is 24.3%. Put 237.4g of filter residue into the reaction kettle for the last regenerated sodium chloride solution at 100° C. and stir and mix for 2 hours. Filtration and separation, the filter residue 9.4g continued to be dissolved and used mechanically, t...

Embodiment 3

[0050] The difference with Example 1 is that the following preparation steps are included:

[0051] (1) Dissolving and leaching of lead paste: Put 500g of waste lead paste, 4000g of hydrochloric acid with a mass content of 28% and sodium chloride with a mass content of 8% into an enamel reaction kettle and heat it to 115°C for 2.5 hours, then titrate with EDTA The dissolution rate of lead ion after monitoring the first step reaction is 61.8%. After the reaction is completed, it is filtered and separated at 73° C., and the filter residue is 246.7 g for subsequent use.

[0052] (2) Dissolution and leaching of filter residues: filter residues were sampled to detect that the mass content of lead sulfate was 75.3%, and the water content of filter residues was 23.8%. Put 246.7g of filter residues into the reactor with regenerated sodium chloride solution and stir and mix them for 2.3 hours at 115°C. Filtration and separation, the filter residue 16.8g continued to be dissolved and us...

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Abstract

The invention relates to the technical field of lead-acid storage batteries, and discloses a method for preparing lead oxide by means of scrap lead paste. By the adoption of the method for preparing the lead oxide by means of the scrap lead paste, the problems that in the process of preparing lead oxide by means of scrap lead paste in the prior art, the consumption of chemical reagents is high, and the industrial production cost is high are solved. The method for preparing the lead oxide by means of the scrap lead paste comprises the following preparation steps of (1) dissolution and leachingof the lead paste; (2) dissolution and leaching of filter residues; (3) cyclic regeneration of sodium chloride mother liquor; (4) preparation of the lead oxide; (5) cyclic regeneration of sodium hydroxide mother liquor; and (6) drying and grinding of the lead oxide. The method for preparing the high-purity lead oxide by means of the scrap lead paste is efficient, high in cleanliness, low in consumption and cost, and high in efficiency; the synthesis cost is low, zero waste is basically realized, and a high recovery rate is achieved; the finished lead oxide preparation through the method is excellent in performance and good in granularity consistency, and the electrical performance of materials is improved by the uniform granularity; and the preparation process is simple, the synthesis cycle is short, the synthesis efficiency is high, the controllability of the process steps is good, and mass production can be realized.

Description

technical field [0001] The invention relates to the technical field of lead-acid batteries, in particular to a method for preparing lead oxide from waste lead paste. Background technique [0002] Lead-acid batteries are closely related to the national economy and people's livelihood, such as electric power, transportation, information and other industries, and are indispensable products for social production and operation and human life. With the vigorous development of related electric mopeds, electric tricycles, electric vehicles, energy storage communications, electric power and other fields, lead-acid batteries will continue to grow, so the recycling of a large number of scrapped batteries will become a huge social problem. Lead-acid batteries themselves The scrapping period caused by corrosion, passivation, etc. is generally 3-5 years. In recent years, the number of scrapped lead-acid batteries replaced from vehicles, ships, and communication base stations in my country ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B13/00C01G21/02
CPCC01G21/02C01P2004/61C01P2006/80C22B7/007C22B13/045Y02P10/20
Inventor 代少振
Owner CHAOWEI POWER CO LTD
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