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Nickel electrolysis micro-pore composite diaphragm and preparation method thereof

A composite diaphragm, nickel electrolysis technology, applied in the direction of diaphragm, electrolysis process, electrolysis components, etc., can solve the problem of short service life, poor acid resistance, poor heat resistance, pore size, porosity and liquid permeability rate and other properties that are difficult to meet production requirements, etc. problem, to achieve the effect of good penetrating ability and good chemical quality

Inactive Publication Date: 2008-01-16
甘肃省膜科学技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, domestic electrolytic nickel production enterprises mainly use industrial filter cloth (polyester filter cloth or polyester cotton filter cloth) to make cathode diaphragm bags. Performance such as speed is difficult to meet production requirements
Moreover, the service life is generally short and frequent replacement is required
Not only labor-intensive, but also affect production efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A nickel electrolytic microporous composite diaphragm, prepared by using industrial filter cloth polyester 747 as the base material:

[0024] 1. Preparation of casting solution: solvent N,N-dimethylformamide-40g, first component polymer polysulfone-10g, second component polyvinyl acetate-3g, non-solvent ethanol-30g, additives Polyethylene glycol-4g is mixed, heated and stirred until completely dissolved, and allowed to stand for defoaming;

[0025] 2. Film formation: At an ambient temperature of 15°C, an ambient humidity of 30%, and a temperature of the casting solution of 50°C, the film is formed on the industrial filter cloth substrate by dip coating and rolling, and the distance between the rolls is 0.8 mm;

[0026] 3. Evaporation: Evaporate for 8 minutes at an ambient temperature of 15°C and an ambient humidity of 30%;

[0027] 4. Phase inversion: immerse the film obtained in the above steps 2 and 3 in a non-solvent bath;

[0028] 5. Heat treatment: Heat the film...

Embodiment 2

[0030] A nickel electrolytic microporous composite diaphragm is prepared by using industrial filter cloth polyester 5×5 as the base material:

[0031] 1. Preparation of casting solution: solvent N,N-dimethylacetamide-60g, first component polymer polyvinylidene fluoride-20g, second component polymer polyvinyl acetate-8g, non-solvent methanol Mix -20g, heat and stir until completely dissolved, and let it stand for defoaming;

[0032] 2. Film formation: At an ambient temperature of 30°C, an ambient humidity of 60%, and a temperature of the casting solution of 70°C, the film is formed on the industrial filter cloth substrate by dip coating and rolling, and the distance between the rolls is 1.2 mm;

[0033] 3. Evaporation: Evaporate for 2 minutes at an ambient temperature of 30°C and an ambient humidity of 60%;

[0034] 4. Phase inversion: immerse the film obtained in the above steps 2 and 3 in a non-solvent bath;

[0035] 5. Heat treatment: Heat the film prepared in step 4 in a...

Embodiment 3

[0037] A nickel electrolytic microporous composite diaphragm is prepared by using industrial filter cloth polyester 120 as the base material:

[0038] 1. Preparation of casting solution: solvent N,N-dimethylacetamide-50g, first component polymer polyvinyl chloride-15g, second component polymer polyvinyl alcohol-5g, non-solvent isopropanol -25g, additive Lithium Chloride-1g mixed, heating and stirring until completely dissolved, standing for defoaming;

[0039] 2. Film formation: At an ambient temperature of 20°C, an ambient humidity of 50%, and a temperature of the casting solution of 60°C, a film is formed on the industrial filter cloth substrate by dip coating and rolling, and the distance between the rolls is 1.0 mm;

[0040] 3. Evaporation: Evaporate for 5 minutes at an ambient temperature of 25°C and an ambient humidity of 45%.

[0041] 4. Phase inversion: immerse the film obtained in the above steps 2 and 3 in a non-solvent bath;

[0042] 5. Heat treatment: Treat the ...

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PUM

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Abstract

A microporous composite diaphragm for nickel electrolysis is provided, which employs industrial filter cloth as substrate. The first ingredient composition comprises polysulfone, polyvinylidene difluoride, and polyvinyl chloride, accounting for 10-20 percent. The second ingredient composition comprises polyvinyl acetate and polyvinyl alcohol, accounting for 3-8 percent. The solvent, for dissolving the first ingredient composition, accounts for 40-60 percent of the diaphragm fluid. The non-solvent, mixing with the solvent, accounts for 20-30 percent of the diaphragm fluid. The additive composition comprises polyethylene glycol, polyvinyl pyrrolidone, and lithium chloride and nickel sulphate, accounting for 0-4 percent. The diaphragm is prepared by the steps of diaphragm fluid preparation, diaphragm formation, evaporation, phase conversion and heat treatment. The invention has the advantages of appropriate liquid level difference (30-48mm), good permeability, better gradient of liquid components, long service life (up to or above a half of year), and good appearance and chemical property of electrolytic nickel product.

Description

technical field [0001] The invention relates to the technical field of chemical product manufacturing industry, in particular to a nickel electrolytic microporous composite diaphragm for electrolytic metallurgy with membrane technology, and the invention also includes a preparation method thereof. Background technique [0002] In the production practice of electrolytic extraction and electrolytic refining of nickel metal, a cathode diaphragm is required to separate the cathode and anode regions and control material migration. The purified electrolyte continuously flows into the cathode diaphragm bag. The liquid level of the electrolyte in the cathode diaphragm bag needs to be higher than the liquid level in the anode area and maintain a certain liquid level difference of 50mm, so that the filtration speed of the catholyte through the diaphragm bag is faster than that of impurity metal ions from the anode to the cathode under the action of current. Migration speed, so as to ...

Claims

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Application Information

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IPC IPC(8): C25C7/04C25C1/08
Inventor 安兴才蒲瑜王应平
Owner 甘肃省膜科学技术研究院有限公司
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