Lead plaster desulfurization method 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, obvious advantages, and shortening desulfurization time.

Active Publication Date: 2016-07-06
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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  • Lead plaster desulfurization method 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 paste slurry with a mass fraction of 20% is prepared in the lead paste 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, the lead paste slurry and the desulfurizer are stirred evenly, and then the circulation pump 2 is turned on. The lead paste slurry is boosted by the circulation pump 2 and mixed with compressed air, and then enters the desulfurizer 3, and a spiral piece is installed inside the desulfurizer 3 , the gas-liquid mixed flow forced desulfurization is carried out in the desulfurizer 3, and the lead paste slurry circulates among the storage tank 1, the circulation pump 2 and the desulfurizer 3, and the flow rate of the circulation pump 2 is 30m 3 / h, the liquid-gas ratio is controlled at 1:1.2, and the flow rate of the lead paste slurry in the d...

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, a lead paste slurry with a mass fraction of 40% is prepared in the lead paste 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, the lead paste slurry and the desulfurizer are stirred evenly, and then the circulation pump 2 is turned on. The lead paste slurry is boosted by the circulation pump 2 and mixed with compressed air, and then enters the desulfurizer 3, and the desulfurizer 3 is equipped with a swirl flow In the desulfurizer 3, the gas-liquid mixed flow forced desulfurization is carried out. The lead paste slurry is circulated among the storage tank 1, the circulation pump 2 and the desulfurizer 3. The flow rate of the circulation pump 2 is 50m3 / h, and the liquid-gas ratio is controlled at 1: 1.3, the flow rate of the lead paste slurry in the desulfurizer 3 i...

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 paste slurry with a mass fraction of 60% is prepared in the lead paste storage tank 1, and the volume is 5m 3 , use (NH 4 ) 2 CO 3 As a desulfurizer, (NH 4 ) 2 CO 3 with PbSO 4 The dosing ratio is 1:1.2, the lead paste slurry and the desulfurizer are stirred evenly, and then the circulation pump 2 is turned on. After the lead paste slurry is boosted by the circulation pump 2, it is mixed with compressed air, and then enters the desulfurizer 3, and a spiral piece is installed inside the desulfurizer 3 , the gas-liquid mixed flow forced desulfurization is carried out in the desulfurizer 3, the lead paste slurry circulates among the storage tank 1, the circulation pump 2 and the desulfurizer 3, and the flow rate of the circulation pump 2 is 50m 3 / h, the liquid-gas ratio is controlled to be 1:1.3, and the flow rate of the lead pas...

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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 the lead paste of waste lead-acid storage batteries, belonging 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. In my country, nearly 300 million lead-acid batteries are scrapped every year, 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. It can not only recycle resources such as lead and plastics, but also meets the needs of environmental protection. Plastics, lead grids, lead paste, etc. obtained by crushing and sorting waste lead-acid batteries after collection need to be recycled. The main components of the 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 it als...

Claims

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Application Information

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Patent Type & Authority Applications(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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