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Method for removing barium sulfate impurity from lead dioxide

A technology of lead dioxide and barium sulfate, applied in the direction of lead dioxide and lead oxide, which can solve the problems of reducing oxygen evolution overpotential, affecting the capacity and life of lead-acid batteries, and achieving the effect of reducing operation steps

Active Publication Date: 2016-09-07
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] (2) Barium sulfate is a harmful impurity of the positive electrode active material: the positive electrode active material of the lead storage battery is lead dioxide, if the lead dioxide containing barium sulfate is directly used as the positive electrode material of the lead storage battery, it will be reduced due to the presence of barium sulfate The oxygen evolution overpotential on the lead dioxide electrode and the presence of barium sulfate impurities will affect the capacity and life of the lead-acid battery
[0017] Research and develop the process technology for removing barium sulfate impurities in lead dioxide, and solve the problems existing in the current separation method. The key problem that needs to be solved is that the lead-containing materials of waste lead-acid batteries can be directly used as raw materials for the preparation of positive electrode active materials of lead-acid batteries after treatment.

Method used

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  • Method for removing barium sulfate impurity from lead dioxide

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Embodiment 1

[0043] Such as figure 1 As shown, a method for removing barium sulfate impurities in lead dioxide, using lead dioxide containing barium sulfate as raw material, using concentrated sulfuric acid as leaching agent and detergent, adopts leaching and dissolving-pickling to remove impurities-solid A process method for preparing sulfuric acid solution containing lead dioxide and barium sulfate by liquid separation coupling technology. The specific method steps are as follows:

[0044] (1) Leaching and dissolving: in the stirred tank type leaching and dissolving equipment, lead dioxide containing 0.5% barium sulfate and 15.6mol / L sulfuric acid are mixed and leached, and the consumption ratio of lead dioxide and leaching agent is 1.0kg: 1.0L, the operating temperature is 60°C, the barium sulfate in lead dioxide is leached and dissolved in concentrated sulfuric acid, and the material after leaching, dissolving and removing impurities enters the next step;

[0045] (2) Solid-liquid se...

Embodiment 2

[0049] (1) leaching and dissolving: in the dynamic mixer leaching and dissolving equipment, the lead dioxide containing 2.0% barium sulfate is mixed with 18.6mol / L sulfuric acid, leaching, the consumption ratio of lead dioxide and leaching agent is 1.0kg: 1.0L, the operating temperature is 20°C, the barium sulfate in the lead dioxide is leached and dissolved in the concentrated sulfuric acid solution, and the material after leaching, dissolving and removing impurities enters the next step;

[0050] (2) Solid-liquid separation: In the drum-type vacuum filtration solid-liquid separation equipment, the material obtained in the previous step is subjected to solid-liquid separation, and the liquid phase material obtained through solid-liquid separation can be further separated and removed to realize resource utilization , the obtained solid phase material enters the next step;

[0051] (3) Pickling and impurity removal: In the stirred tank type washing and impurity removal equipmen...

Embodiment 3

[0054] (1) Leaching and dissolving: In the stirred tank type leaching and dissolving equipment, lead dioxide containing 1.5% barium sulfate and 18.0mol / L sulfuric acid are mixed and leached, and the consumption ratio of lead dioxide and leaching agent is 1.0kg: 4.0L, the operating temperature is 30°C, the barium sulfate in the lead dioxide is leached and dissolved in the concentrated sulfuric acid solution, and the material after leaching, dissolving and removing impurities enters the next step;

[0055] (2) Solid-liquid separation: In the solid-liquid separation equipment of the centrifuge, the material obtained in the previous step is subjected to solid-liquid separation, and the liquid phase material obtained through solid-liquid separation can be further separated and removed to realize resource utilization. The phase material enters the next step;

[0056] (3) Pickling and impurity removal: In the stirred tank type washing and impurity removal equipment, the material obta...

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Abstract

The invention relates to a method for removing barium sulfate impurity from lead dioxide. The method comprises the following steps: taking lead dioxide containing barium sulfate as the raw material, taking concentrated sulfuric acid as the leaching agent and washing agent, dissolving barium sulfate in lead dioxide into concentrated sulfuric acid at first, then carrying out solid-liquid separation, washing the solids by acid to further remove barium sulfate; and finally carrying out solid-liquid separation to obtain lead dioxide and a sulfuric acid solution containing barium sulfate. The lead oxide without barium sulfate can be directly used as the raw material to prepare active substances of electrode of lead battery, the sulfuric acid containing barium sulfate can be further separated to remove the impurity, and the wastes are converted into valuable resources. The method has the advantages of environment-friendliness, simple technology, low energy consumption, safe and reliable process, and easiness for realizing massive industrial production.

Description

technical field [0001] The invention relates to a method for removing lead dioxide (PbO 2 ) in barium sulfate (BaSO 4 ) impurities and belongs to the technical fields of comprehensive utilization of waste lead storage battery three wastes, separation and purification of inorganic compounds and preparation of inorganic materials. Background technique [0002] 1. Waste lead storage battery and lead paste [0003] After the lead-acid battery has been charged and discharged for many times, the capacity drops to a very low level or the grid is corroded seriously, the lead-acid battery is difficult to repair, and the charging and discharging work cannot be performed normally, resulting in waste lead-acid battery. [0004] Lead paste (mainly containing PbO, PbSO 4 , PbO 2 ), lead paste is the main lead-containing compound in waste lead-acid batteries. Realizing the comprehensive utilization of resources of lead paste has significant economic benefits, environmental benefits an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G21/08
CPCC01G21/08
Inventor 许文林朱少午王雅琼聂文程世骑
Owner YANGZHOU UNIV
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