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A slurrying process of diatomite filter for lithium battery copper foil system

A diatomite filter, electrolytic copper foil technology, applied in the direction of filtration separation, electrolysis process, filtration circuit, etc., can solve the problems of electrolyte substance concentration imbalance, filter system flow drop, unqualified copper foil, etc., to improve copper foil Foil yield, reduce fluctuations, avoid the effect of influence

Active Publication Date: 2022-05-20
LINGBAO WASON COPPER FOIL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after using the filter cloth type diatomite filter to run for a period of time, the filter cloth is covered with impurities and organic matter, which will cause the flow rate of the filter system to drop, and it is necessary to clean the filter cloth and re-hang the slurry
However, in the existing technology, a certain amount of diatomite is added to the electrolyte, and after the slurrying cycle, the sewage pump is started to enter the clean liquid tank at one time, resulting in large fluctuations in the system during the slurrying process, which may easily cause an imbalance in the concentration of the electrolyte. , resulting in unqualified copper foil

Method used

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  • A slurrying process of diatomite filter for lithium battery copper foil system
  • A slurrying process of diatomite filter for lithium battery copper foil system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In the production of electrolytic copper foil, in addition to copper sulfate, other additives are added to the electrolyte, such as hydroxyethyl cellulose, sodium P-alcohol thiopropane sulfonate, PN polyethyleneimine alkyl salt, etc. These additives together with copper sulfate constitute the solute environment of the copper foil electrolyte. However, during the slurrying process, an oxidizing agent needs to be added in advance to oxidize and remove impurities in the electrolyte. At this time, the initially added organic additives will also be degraded, resulting in the inconsistency of the solute composition of the slurrying solution with the electrolyte used for production. In order to avoid fluctuations in the solution environment during the slurrying process, it is necessary to re-add organic additives after adding oxidants to remove impurities.

[0027] Additives commonly used in the production of copper foil include A, B, C, and D. The A is HEC hydroxyethyl cellul...

Embodiment 2

[0035] A slurrying process of a diatomite filter for an electrolytic copper foil system (see the schematic diagram of the device connection involved in the process figure 2 ), including the following steps:

[0036] 1) Put the copper sulfate electrolyte to be treated in the slurry tank, the volume of the slurry tank is 30m 3 , the liquid level is 50% of the volume of the slurry tank; add 50 liters of hydrogen peroxide, the volume ratio of hydrogen peroxide to the electrolyte to be treated is 0.33%; use hydrogen peroxide to decompose the organic matter or impurities in the electrolyte;

[0037] 2) Add a certain amount of additives A, B, C, and D for production in proportion, among which the amount of A added is 2 ppm, the amount of B added is 4 ppm, the amount of C added is 6 ppm, and the amount of D added is 2 ppm;

[0038] 3) Turn on the stirring pump of the slurry tank, add diatomite into the slurry tank, the amount of diatomite added is 150kg, and add in 10 times; after t...

Embodiment 3

[0044] A slurrying process of a diatomite filter for an electrolytic copper foil system, specifically comprising the following steps:

[0045] 1) Add copper sulfate electrolyte to be treated in the slurry tank, the volume of the slurry tank is 30m 3 , the liquid level is 80% of the volume of the slurry tank; add 50 liters of hydrogen peroxide, the volume ratio of hydrogen peroxide to the electrolyte to be treated is 0.21%, and use hydrogen peroxide to decompose the organic matter or impurities in the electrolyte;

[0046]2) Add a certain amount of additives A, B, C, and D for production in proportion, among which the amount of A added is 3 ppm, the amount of B added is 6 ppm, the amount of C added is 9 ppm, and the amount of D added is 3 ppm;

[0047] 3) Turn on the stirring pump of the slurry tank, add diatomite into the slurry tank, the amount of diatomite added is 150kg, add in 10 times, each cycle time is 4h;

[0048] 4) Turn on the slurry pump, so that the slurry slurry ...

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Abstract

The application belongs to the technical field of electrolytic copper foil production technology, and in particular relates to a slurry-hanging process of a diatomite filter for a lithium battery copper foil system. This application uses the electroplating experiment to determine the concentrations of different additives A, B, C, and D in the copper foil electrolyte to be coated, wherein A is HEC hydroxyethyl cellulose, B is HP sodium alcohol thiopropane sulfonate, and C is PN polyethyleneimine alkyl salt, D is BSP sodium phenyl dithiopropane sulfonate. By adding an appropriate concentration of additives used in the initial stage of production into the electrolyte to be treated, the fluctuation of the solute system in the slurrying system is effectively reduced, and the abnormal amount during the slurrying period is reduced. The verification results show that the glossiness of the copper foil after using the process of this application is compared with that before the coating. The impact of the process on the production of electrolytic copper foil can improve the yield of copper foil.

Description

technical field [0001] The application belongs to the technical field of electrolytic copper foil production technology, and in particular relates to a slurry-hanging process of a diatomite filter for a lithium battery copper foil system. Background technique [0002] In the process of electrolytic copper foil production, copper dissolution is the first process of electrolytic copper foil production, and it is also a very critical step. As the most important indicator of the copper dissolution process, the cleanliness of the solution is directly related to the production of electrolytic copper foil. The smooth, normal and stable process is related to whether the quality of electrolytic copper foil is stable. [0003] Diatomite filter is a filter device that uses diatomite as the main medium to remove impurities such as suspended particles and colloids in the electrolyte by using the fineness and porosity of diatomite particles. The core part of the filter is composed of thr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D36/00B01D35/02C25D3/38C25D1/04
CPCB01D36/006B01D35/02C25D3/38C25D1/04Y02P10/20
Inventor 王庆福樊斌锋李应恩彭肖林
Owner LINGBAO WASON COPPER FOIL
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