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Silver plating piece deplating method with renewable and recyclable deplating liquid

A technology for deplating solution and silver-plated parts, which is applied in the field of environmental pollution control, can solve the problems of plastic-based silver-plated parts with inconspicuous effects, optimize the operation of deplating and sinking silver, increase acidity, and solve the problem of high total nitrogen Effect

Pending Publication Date: 2021-01-01
张少强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above method has a better effect on metal-based silver-plated parts, the effect on plastic-based silver-plated parts is not obvious

Method used

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  • Silver plating piece deplating method with renewable and recyclable deplating liquid
  • Silver plating piece deplating method with renewable and recyclable deplating liquid
  • Silver plating piece deplating method with renewable and recyclable deplating liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for stripping a silver-plated part with a regenerable cycle of stripping solution, specifically comprising the following steps:

[0034] A. Pretreatment of stripped parts;

[0035] In order to reduce the pollution of the stripping solution and avoid the interference of organic substances on the circulation process of the stripping solution, use a cleaning agent to clean the stripped parts, preferably sodium carbonate with a concentration of 0.5% (w / w) as the cleaning agent, preferably dodecane Sodium benzene sulfonate is used as surfactant, and the addition amount of sodium dodecyl benzene sulfonate is 0.01% of the total weight of sodium carbonate; the silver plated parts are soaked in cleaning agent and surfactant for 0.5h, in order to improve the cleaning speed , heat the cleaning agent, and the heating temperature is controlled at 40 ° C; in order to keep the stripping solution clean, use deionized water to rinse the stripped parts after cleaning and dry the...

Embodiment 2

[0050] A kind of deplating liquid reproducible circulation silver-plated article deplating method, and the difference of embodiment 1 is: in the step A, the preferred ethanol of cleaning agent is as cleaning agent.

[0051] In the step C, the concentrated hydrochloric acid with a preferred concentration of 31% is used as the silver deposit agent, and the concentration of chloride ions in the silver deposit agent is 1.10 times of the silver ion concentration.

[0052] The extraction of chloride ion still adopts tributyl methyl ammonium bicarbonate as extractant, and the addition ratio of extractant is 1 times of stripping solution volume.

[0053] In the recovery of copper in the deplating solution, copper plates are selected as cathodes.

[0054] Direct current is used during the electrolysis process, and the current density during the electrolysis process is 150A / m 2 . The electrolysis time is 0.5 hours.

[0055] By the stripping solution after the above-mentioned regenera...

Embodiment 3

[0060] A kind of deplating method of the silver-plated piece that the deplating solution can regenerate and circulate, and the difference of embodiment 1 is that

[0061] A, the pretreatment of stripping piece is the same as embodiment 1.

[0062] B, the stripping piece after the pretreatment is put into the stripping pool, the stripping pool is filled with the stripping solution, and the composition of the stripping solution includes by weight parts: 85 parts of deionized water, 10 parts of nitric acid , In order to increase the stripping speed, add hydrofluoric acid and sulfuric acid to the stripping solution, 2.5 parts of hydrofluoric acid and 2.5 parts of sulfuric acid.

[0063] Raising the temperature of the stripping solution will greatly improve the stripping effect. The preferred temperature of the stripping solution in this embodiment is 30°C, and the stripping solution is always recycled during the stripping process.

[0064] C, the regeneration of deplating solutio...

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Abstract

The invention discloses a silver plating piece deplating method with renewable and recyclable deplating liquid. The method comprises the following steps: A, cleaning and pre-treating a deplated piece;B, deplating treatment of the deplated part: putting the pretreated deplated part into a deplating pool, wherein a deplating solution is contained in the deplating pool and comprises deionized water,nitric acid, hydrofluoric acid and sulfuric acid; and C, regeneration of the deplating solution: carrying out silver precipitation treatment on the deplating solution, then carrying out extraction treatment through an extraction agent, and then carrying out electrolytic recovery to complete regeneration of the deplating solution. According to the method, through pre-cleaning of the deplated piece, interference of organic matter on the deplating solution circulation process is avoided; the hydrochloric acid is used for replacing sodium chloride to precipitate silver, redundant chloride ions are removed through a solvent extraction method, the silver recovery rate is increased, and the acidity of the deplating solution is improved; and copper is recycled through an electrolysis method so that new pollution cannot be brought in, recycling of the deplating solution is further achieved, and discharge of pollutants such as nitrate radicals which are difficult to treat is avoided.

Description

technical field [0001] The invention relates to the field of environmental pollution control, in particular to a method for stripping silver-plated parts with a regenerable and circulating stripping solution. Background technique [0002] Because the silver-plated layer is easy to polish, has strong reflective ability and good thermal conductivity, electrical conductivity and welding performance, in addition to being used for decorative materials, silver-plated layer is currently widely used in the electronics industry, communication configuration and instrumentation manufacturing industry. Silver plating reduces the resistance of metal parts and improves the welding ability of metals. Also, metal reflectors in searchlights and other reflectors need to be silver plated. The silver plating baths currently used are often cyanide baths. [0003] However, in the actual silver plating process, many unqualified plated parts will be produced, and these plated parts need to be rew...

Claims

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Application Information

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IPC IPC(8): C23F1/30C23F1/46C22B11/00C25C1/12
CPCC23F1/30C23F1/46C22B11/046C25C1/12Y02P10/20
Inventor 张少强
Owner 张少强