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A kind of lead plaster desulfurization method with ultrasonic strengthening ammonium bicarbonate as desulfurization agent

A technology of ammonium bicarbonate and ultrasonic waves, which is applied in the field of desulfurization of lead paste in the regeneration process of waste lead-acid batteries, can solve the problems of hindering the reaction and producing a large amount, and achieve the effects of eliminating foam, good desulfurization effect, and low energy consumption

Active Publication Date: 2018-08-03
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the product covering the surface of the reactant hinders the reaction and generates a large amount of foam during the desulfurization reaction process of the ammonium bicarbonate lead paste, and to improve the effect of ammonium bicarbonate in the process of the desulfurization reaction of the lead paste, the invention provides an ultrasonically strengthened ammonium bicarbonate for The lead paste desulfurization method of the desulfurizer uses the ultrasonic wave to crush the solid to instantly break the product layer wrapped on the surface of the reactant. After the product layer is broken, it is dispersed into the slurry under the action of stirring; Breaks the air bubbles in the foam to release the slurry trapped in the air bubbles and prevent the foam layer from expanding

Method used

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  • A kind of lead plaster desulfurization method with ultrasonic strengthening ammonium bicarbonate as desulfurization agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Put 400 kg of lead paste obtained after crushing waste lead-acid batteries into a desulfurization tank, add 900 kg of water to make 1 m of slurry with a mass percentage of 30.8% 3 , start the stirrer, adjust the stirring speed to 80 rpm, stir for 5 minutes, weigh a total of 107 kg of desulfurizer NH 4 HCO 3 , start the ultrasonic generator, add NH in 3 times 4 HCO 3 , with an interval of 10 minutes, the successive additions are 50 kg, 40 kg, and 27 kg. The sulfur content of the original lead paste is 5.3%. After desulfurization by this desulfurization process for 40 minutes, the sulfur content of the lead paste after desulfurization is 0.32%.

Embodiment 2

[0020] Put 600 kg of lead paste obtained after crushing waste lead-acid batteries into a desulfurization tank, add 900 kg of water to make 1.2 m of slurry with a mass percentage of 40% 3 , start the stirrer, adjust the stirring speed to 100 rpm, stir for 5 minutes, weigh a total of 162 kg of desulfurizer NH 4 HCO 3 , start the ultrasonic generator, add NH in 3 times 4 HCO 3 , with an interval of 10 minutes, the successive additions are 80 kg, 60 kg, and 22 kg. The sulfur content of the original lead paste is 5.3%. After desulfurization by this desulfurization process for 40 minutes, the sulfur content of the lead paste after desulfurization is 0.34%.

Embodiment 3

[0022] Put 1200 kg of lead paste obtained after crushing waste lead-acid batteries into the desulfurization tank, add 900 kg of water to make 1.5m of slurry with a mass percentage of 57% 3 , start the stirrer, adjust the stirring speed to 120 rpm, stir for 5 minutes, weigh a total of 330 kg of desulfurizer NH 4 HCO 3 , start the ultrasonic generator, add NH in 4 times 4 HCO 3 , with an interval of 10 minutes, the successive additions are 400 kg, 300 kg, 300 kg, and 200 kg. The sulfur content of the original lead paste is 5.3%. After desulfurization by this desulfurization process for 60 minutes, the sulfur content of the lead paste after desulfurization is 0.28%.

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Abstract

The invention discloses an ultrasonic enhanced lead paste desulphurization method with ammonium bicarbonate as a desulfurizer. The method comprises the following steps: slurry with solid content being 30-70% is prepared from lead paste in a desulphurization tank; a desulfurizer ammonium bicarbonate, which is 2.02-2.10 times greater than mass of lead sulfate, is added in batches into the desulphurization tank; mass concentration of ammonium bicarbonate in the desulphurization tank during the whole process is controlled to be not more than 5%, and the stirring speed is controlled to be 70-120 r / m; in the central section of the desulphurization tank, two or four ultrasonic generator probes are arranged for enhancing desulphurization; in the upper middle section of the desulphurization tank, two or four ultrasonic generator probes are arranged for defoaming; and the bottom of the desulphurization tank is an inverted V shape with a higher center and lower periphery, and is provided with a slurry pump for conveying reacted slurry to the subsequent process. According to the invention, surface renewal of the reaction material in the desulphurization process is enhanced, and foams generated by the reaction are effectively eliminated. Thus, a very good desulphurization effect is achieved. In addition, the technology and the equipment structure are simple, energy consumption for the operation is low, and industrial applicability is strong.

Description

technical field [0001] The invention relates to a lead paste desulfurization method using ultrasonic-strengthened ammonium bicarbonate as a desulfurizer, which belongs to the field of waste lead-acid battery resource regeneration and is used for lead paste desulfurization in the waste lead-acid battery regeneration process. Background technique [0002] my country is the world's largest producer and seller of lead. 80% of lead consumption is in lead-acid batteries. There are more than 300 million lead-acid batteries scrapped in my country every year, containing nearly 4 million tons of lead. Lead-acid batteries contain lead and sulfuric acid, which are hazardous waste and must be disposed of safely. After the waste lead-acid batteries are collected to the secondary lead enterprise, they are first crushed and sorted to obtain main materials such as plastics, waste acid, lead tips, and lead paste, among which lead paste is the most important component. The main components of l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B1/11C22B13/02H01M10/54
CPCC22B1/11C22B7/001C22B13/025H01M10/54Y02P10/20Y02W30/84
Inventor 张俊丰王幸刘磊黄妍曹靖
Owner XIANGTAN UNIV
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