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A method for desulfurization of lead paste based on gas-liquid mixed flow

A lead paste, gas-liquid technology, applied in the field of lead paste desulfurization of waste lead-acid batteries, can solve problems such as environmental damage, and achieve the effects of strengthening effective contact, low energy consumption, and stable system operation

Active Publication Date: 2018-01-30
HUNAN JIANG YE MECHANICAL & ELECTRICAL TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current regeneration process of waste lead paste resources mainly includes high-temperature pyromelting and pre-desulfurization-low-temperature smelting. It is reduced to lead under the action of reducing agent, however, a large amount of SO will be produced in the process of pyrometallurgy 2 , if desulfurization treatment is not carried out in the follow-up, it will cause great damage to the environment

Method used

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  • A method for desulfurization of lead paste based on gas-liquid mixed flow
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Examples

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Effect test

Embodiment 1

[0018] A kind of lead paste desulfurization method based on gas-liquid mixed flow provided by the invention, such as figure 1 As shown, the lead plaster slurry with a mass fraction of 20% is prepared in the lead plaster storage tank 1, and the volume is 5m 3 , with Na 2 CO 3 As a desulfurizer, Na 2 CO 3 with PbSO 4 The dosing ratio is 1:1.05. After the lead paste slurry and the desulfurizer are evenly stirred, the circulating pump 2 is turned on. The lead paste slurry is boosted by the circulating pump 2 and mixed with the compressed air, and then enters the desulfurizer 3. The inside of the desulfurizer 3 is equipped with spiral blades , the gas-liquid mixed flow forced desulfurization is carried out in the desulfurizer 3, and the lead paste slurry is circulated among the storage tank 1, the circulating pump 2 and the desulfurizer 3, and the flow rate of the circulating pump 2 is 30m 3 / h, the liquid-gas ratio is controlled to 1:1.2, and the flow rate of the lead paste s...

Embodiment 2

[0021] A kind of lead paste desulfurization method based on gas-liquid mixed flow provided by the invention, such as figure 1 As shown, the lead plaster slurry with a mass fraction of 40% is prepared in the lead plaster storage tank 1, and the volume is 5m 3 , with Na 2 CO 3 As a desulfurizer, Na 2 CO 3 with PbSO 4 The dosing ratio is 1:1.1. After the lead paste slurry and the desulfurizer are evenly stirred, the circulating pump 2 is turned on. The lead paste slurry is boosted by the circulating pump 2 and mixed with the compressed air, and then enters the desulfurizer 3. The inside of the desulfurizer 3 is equipped with a swirl flow. Piece, in desulfurizer 3, carry out gas-liquid mixed flow forced desulfurization, lead paste slurry is circulated among storage tank 1, circulating pump 2 and desulfurizer 3, circulating pump 2 flow rate is 50m / h, and the liquid-gas ratio is controlled to be 1: 1.3, the flow rate of lead paste slurry in desulfurizer 3 is 40m / s. The sulfu...

Embodiment 3

[0024] A kind of lead paste desulfurization method based on gas-liquid mixed flow provided by the invention, such as figure 1 As shown, the lead plaster slurry with a mass fraction of 60% is prepared in the lead plaster storage tank 1, and the volume is 5m 3 , with (NH 4 ) 2 CO 3 As a desulfurizer, (NH 4 ) 2 CO 3 with PbSO 4 The dosing ratio is 1:1.2. After the lead paste slurry and the desulfurizer are evenly stirred, the circulating pump 2 is turned on. The lead paste slurry is boosted by the circulating pump 2 and mixed with the compressed air, and then enters the desulfurizer 3. The inside of the desulfurizer 3 is equipped with a spiral sheet , the gas-liquid mixed flow forced desulfurization is carried out in the desulfurizer 3, and the lead paste slurry is circulated among the storage tank 1, the circulating pump 2 and the desulfurizer 3, and the flow rate of the circulating pump 2 is 50 m 3 / h, the liquid-gas ratio is controlled to be 1:1.3, and the flow rate of ...

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Abstract

The invention discloses a lead plaster desulfurization method based on gas-liquid mixed flow and belongs to the field of waste lead-acid battery resource regeneration. The lead plaster desulfurization method comprises the specific steps that lead plaster is prepared to be lead plaster slurry with a certain concentration, then the lead plaster slurry is stored in a storage tank, and a desulfurizing agent is added into the storage tank; after being pressurized through a circulating pump, the lead plaster slurry is mixed with compressed air and then enters a desulfurizer which is internally provided with flow deflectors; and the lead plaster slurry and airflow form violent turbulent flow in the desulfurizer, and the surface of a reactant is instantaneously updated, so that efficient desulfurization is achieved. The lead plaster desulfurization method based on gas-liquid mixed flow is simple in process, rapid in response, high in production capacity and convenient to operate and maintain.

Description

technical field [0001] The invention relates to a method for desulfurizing lead paste of waste and old lead-acid batteries, and belongs to the field of lead resource recycling. Background technique [0002] Lead-acid batteries are widely used in automobiles, motorcycles, electric mopeds, communications, military and other fields. Nearly 300 million lead-acid batteries are scrapped every year in my country, containing more than 3.5 million tons of lead. The recycling of waste lead-acid battery resources is an important part of the circular economy, which not only can recover lead, plastics and other resources, but also meet the needs of environmental protection. Waste lead-acid batteries are collected and crushed and sorted to obtain plastics, lead grids, lead pastes, etc., which all need to be recycled. The main components of lead paste include: PbSO 4 (50-60%), PbO 2 (30-35%), PbO (10-15%) and other substances (0.2-0.7%). Lead sulfate accounts for the main part, and als...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/11C22B7/00C22B13/00H01M10/54
CPCC22B1/11C22B7/00C22B13/00H01M10/54Y02P10/20Y02W30/84
Inventor 范伟张俊丰刘磊王振云吴光辉
Owner HUNAN JIANG YE MECHANICAL & ELECTRICAL TECH CO LTD
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