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Method for removing carbonate in cyanide silver-plating bath solution

A carbonate and silver-plating tank technology, applied in the direction of cells, electrolysis process, electrolysis components, etc., can solve the problems of severe heat release, large safety hazards, etc., and achieve the effect of less environmental pollution, less safety hazards, and less volatilization

Inactive Publication Date: 2017-11-07
PLA NO 5719 FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding CaCl directly in the traditional method 2 It will exotherm violently, causing part of the cyanide in the cyanide silver plating solution to volatilize, which poses a great safety hazard

Method used

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  • Method for removing carbonate in cyanide silver-plating bath solution
  • Method for removing carbonate in cyanide silver-plating bath solution
  • Method for removing carbonate in cyanide silver-plating bath solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Get a volume and be 100L sodium cyanide silver-plating bath solution, measure Na in the cyanide silver-plating bath solution by chemical analysis 2 CO 3 .10H 2 The O content is 259.6g / L, and now it is planned to 2 CO 3 .10H 2 O content reduced to 50g / L, according to CaCl 2 with Na 2 CO 3 .10H 2 The chemical reaction equation of O:

[0033] CaCl 2 +Na 2 CO 3 .10H 2 O→CaCO 3 ↓+2NaCl+10H 2 o

[0034] Calculate the need to add CaCl 2 8.13Kg;

[0035] Accurately weigh 8.13Kg CaCl 2 , dissolved in water to give CaCl 2 Solution, join in the sodium cyanide silver-plating bath, stir evenly, after standing for 8h, adopt filtering device to filter the sodium cyanide silver-plating bath, adopt chemical analysis to detect Na in the cyanide silver-plating bath 2 CO 3 .10H 2 The O content was 50.3 g / L.

[0036] According to the above analysis results, it can be learned that adding 8.13Kg CaCl 2 actually reduce Na 2 CO 3 .10H 2The O content is 259.6g / L-50.3g / L...

Embodiment 2

[0040] With a volume of 100L sodium cyanide silver plating bath, measure Na in the cyanide silver plating bath by chemical analysis 2 CO 3 .10H 2 The O content is 259.6g / L, and now it is planned to use BaCl 2 2H 2 O's method converts Na 2 CO 3 .10H 2 O content reduced to 50g / L, according to BaCl 2 2H 2 O and Na 2 CO 3 .10H 2 The chemical reaction equation of O:

[0041] BaCl 2 2H 2 O+Na 2 CO 3 .10H 2 O → BaCO 3 ↓+2NaCl+12H 2 o

[0042] Calculate the need to add BaCl 2 2H 2 O is 17.88Kg;

[0043] Accurately weigh 17.88Kg BaCl 2 2H 2 O is directly added to the sodium cyanide silver-plating bath, stirred evenly, and after standing for 10 days, a filter device is used to filter the sodium cyanide silver-plating bath, and chemical analysis is used to detect Na in the cyanide silver-plating bath. 2 CO 3 .10H 2 The O content was 134.5 g / L.

[0044] According to the above analysis results, it can be learned that adding 17.88Kg BaCl 2 2H 2 O actually lowers...

Embodiment 3

[0047] With a volume of 100L potassium cyanide silver plating bath, K in the cyanide silver plating bath is measured by chemical analysis 2 CO 3 The content is 127.3g / L, now it is planned to add K 2 CO 3 The content is reduced to 40g / L, according to CaCl 2 with K 2 CO 3 The chemical reaction equation:

[0048] CaCl 2 +K 2 CO 3 →CaCO 3 ↓+2KCl

[0049] Calculate the need to add CaCl 2 7.02Kg;

[0050] Accurately weigh 7.02Kg CaCl 2 , dissolved in water to give CaCl 2 Solution, join in the sodium cyanide silver-plating bath, stir evenly, after standing for 8 hours, adopt filtering device to filter the sodium cyanide silver-plating bath, adopt chemical analysis to detect K in the cyanide silver-plating bath 2 CO 3 The content is 40.16g / L.

[0051] According to the above analysis results, it can be known that adding 7.02Kg CaCl 2 actually reduce K 2 CO 3 The content is 127.3g / L-40.16g / L=87.14g / L; according to CaCl 2 with K 2 CO 3 According to the chemical reac...

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PUM

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Abstract

The present invention relates to a kind of method for removing carbonate in cyanide silver-plating bath solution, comprises a, confirms carbonate content: takes cyanide silver-plating bath solution, analyzes and determines wherein carbonate content; B, confirms precipitation agent adding Quantity: Calculate and prepare the carbonate precipitant that needs to be added according to the carbonate content in the cyanide silver plating bath; c. Carbonate precipitation: add the carbonate precipitant to the cyanide silver plating bath , stirred, allowed to stand, precipitated, filtered, and the filtrate was obtained. The invention has the advantages of high carbonate removal efficiency in cyanide silver plating bath liquid, short reaction time, more complete reaction and less potential safety hazard.

Description

technical field [0001] The invention relates to the technical field of surface engineering, in particular to a method for removing carbonate in a cyanide silver plating bath. Background technique [0002] There are two types of cyanide silver plating baths: sodium cyanide silver plating bath and potassium cyanide silver plating bath. The main components of sodium cyanide silver plating bath include: silver, sodium cyanide, sodium carbonate; The main components of the silver bath solution include: silver, sodium cyanide, and potassium carbonate. Carbonate is one of the components of cyanide silver plating bath, its main function is to increase the conductivity of the solution, generally Na 2 CO 3 .10H 2 O and K 2 CO 3 exists in the form of K 2 CO 3 The content does not exceed 50g / L; Na 2 CO 3 .10H 2 O content is not more than 70g / L), in actual work, the content of carbonate in the cyanide silver-plating bath increases with the increase of service time, and this is d...

Claims

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Application Information

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IPC IPC(8): C25D3/46C25D21/18
CPCC25D3/46C25D21/18
Inventor 唐恩军郑付华喻善远李洁刘智赵云强段睿
Owner PLA NO 5719 FACTORY
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