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Method and device for two-stage mechanical strengthening desulfurization of waste lead plaster

A technology of mechanical strengthening and waste lead paste, applied in the direction of lead carbonate, etc., can solve the problems of waste of resources, high energy consumption in the recycling process, high conversion rate, etc., and achieve the effects of improving desulfurization efficiency, reducing product layer coating, and reducing desulfurization costs

Pending Publication Date: 2022-04-12
BEIJING UNIV OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

Patent CN105420489A discloses a method of desulfurization of lead paste based on throttling self-collision, which can effectively promote the desulfurization of lead paste desulfurization products from the surface of lead paste particles, thereby promoting desulfurization of lead paste, but the method has a small solid-liquid ratio, so it is not conducive to desulfurization. The recovery of the product has high energy consumption in the recovery process; patent CN 211999850 U discloses a device for forced desulfurization of lead paste for waste lead-acid batteries, which can effectively improve the desulfurization rate of lead paste, but since the lead paste slurry is only in a single desulfurizer Therefore, the strengthening effect on the desulfurization of lead paste needs to be further improved; patent CN 206607282 U discloses a device for forced desulfurization of lead paste, which can greatly strengthen the collision of lead paste particles and promote the formation of product layers on the surface of lead paste. Peeling can effectively promote the desulfurization reaction, but the equipment is not equipped with a circulation system for the lead paste slurry, so it lacks the reuse of the slurry after desulfurization, resulting in a certain waste of resources and not green enough; patent CN111172402A discloses a circuit board smelting soot A debromination method and device for mechanically enhanced leaching. This method uses the mechanical strengthening effect of the integrated grinding and leaching device to achieve efficient debromination of soot at a high solid-liquid ratio, and has the characteristics of short time consumption and high conversion rate

Method used

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  • Method and device for two-stage mechanical strengthening desulfurization of waste lead plaster
  • Method and device for two-stage mechanical strengthening desulfurization of waste lead plaster
  • Method and device for two-stage mechanical strengthening desulfurization of waste lead plaster

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Embodiment 1

[0026] Follow the steps below to recycle:

[0027] (1) Removal of non-sulfur lead components: waste lead plaster is added in methanesulfonic acid solution to remove non-sulfur lead components such as lead, lead oxide and lead dioxide, wherein the concentration of methanesulfonic acid is 90g / L, the removal temperature is 25°C, the solid-to-liquid ratio is 1.5Kg:10L, and the removal time is 0.5h to obtain the removal slag and lead-containing liquid, and the lead-containing liquid is sent to the lead recovery process;

[0028] (2) Primary desulfurization: Mix the removed slag obtained in step (1) with primary ammonium carbonate solution to perform primary desulfurization, wherein the ammonium carbonate concentration is 530g / L, and the solid-to-liquid ratio is 5Kg:2L, primary desulfurization The gap between the inner gear and the outer gear of the reactor is 10 μm, the rotation speed is 500 rpm, and the desulfurization time is 5 minutes. After the desulfurization is completed, the...

Embodiment 2

[0033] Follow the steps below to recycle:

[0034] (1) Removal of non-sulfur lead components: waste lead plaster is added in methanesulfonic acid solution to remove non-sulfur lead components such as lead, lead oxide and lead dioxide, wherein the concentration of methanesulfonic acid is 150g / L, the removal temperature is 40°C, the solid-to-liquid ratio is 3Kg:10L, and the removal time is 1h, the slag and lead-containing liquid are obtained, and the lead-containing liquid is sent to the lead recovery process;

[0035] (2) Primary desulfurization: Mix the removed slag obtained in step (1) with primary ammonium carbonate solution to perform primary desulfurization, wherein the concentration of ammonium carbonate is 550g / L, and the solid-to-liquid ratio is 3Kg:1L. The gap between the inner gear and the outer gear of the reactor is 15 μm, the rotation speed is 2000 rpm, and the desulfurization time is 20 minutes. After the desulfurization is completed, the solid-liquid separation i...

Embodiment 3

[0040] Follow the steps below to recycle:

[0041] (1) Removal of non-sulfur lead components: Add waste lead paste to the fluosilicic acid solution to remove non-sulfur lead components such as lead, lead oxide and lead dioxide, wherein the concentration of fluosilicic acid is 140g / L, the removal temperature is 25°C, the solid-liquid ratio is 1.5Kg:10L, and the removal time is 1h to obtain the removal slag and lead-containing liquid, and the lead-containing liquid is sent to the lead recovery process;

[0042] (2) Primary desulfurization: Mix the removed slag obtained in step (1) with primary ammonium carbonate solution to perform primary desulfurization, wherein the concentration of ammonium carbonate is 530g / L, and the solid-to-liquid ratio is 3Kg:1L. The gap between the inner gear and the outer gear of the reactor is 15 μm, the rotation speed is 2000 rpm, and the desulfurization time is 20 minutes. After the desulfurization is completed, the solid-liquid separation is carri...

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Abstract

The invention relates to a method and a device for two-stage mechanical strengthening desulfurization of waste lead plaster. The method mainly comprises the steps of non-sulfur lead component removal, primary desulfurization, evaporative crystallization, secondary desulfurization, washing and the like. The invention also discloses a device special for the method. The core components of the device are a primary desulfurization reactor, a secondary desulfurization reactor, a slurry circulating part and a high-efficiency product collecting part. Compared with the prior art, the problems of incomplete product layer coating and reaction in the lead plaster desulfurization process are reduced, and the problems of long desulfurization reaction time, low solid-liquid ratio and the like in the lead plaster desulfurization process are solved. Meanwhile, the modules of graded grinding and desulfurization of lead plaster slurry, efficient collection of products, recycling of desulfurization liquid and the like are integrated, the desulfurization efficiency is further improved, and the desulfurization cost is reduced. The method has the characteristics of cleanness, high efficiency, remarkable energy conservation and emission reduction and the like.

Description

technical field [0001] The invention belongs to the technical field of waste lead storage battery lead paste disposal, in particular to a device and method for mechanically strengthening desulfurization of waste lead paste. Background technique [0002] Lead-acid batteries have the characteristics of stable working voltage, wide operating current range and high safety, and are widely used in automobiles, electric bicycles and energy storage industries. Lead paste is one of the parts with the highest lead content in waste lead-acid batteries. The composition of lead paste is roughly: PbSO 4 46%~55%, PbO 2 28% to 35%, PbO 9% to 12%, Pb 3% to 4%, and other components 2% to 3%, which contain rich lead resources, so it is of great significance to recycle lead paste. [0003] Desulfurization pretreatment-low temperature smelting is currently the mainstream process for recycling lead paste in China. This method is mainly to convert the lead sulfate in the lead paste into lead c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/11C22B7/00C22B13/00C01G21/14
Inventor 潘德安赵丽娟谭哲张晓光王维
Owner BEIJING UNIV OF TECH
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