Electrosilvering cleaning water comprehensive utilization

A technology of cleaning water and electroplating silver, which is applied in water/sewage treatment, metallurgical wastewater treatment, oxidized water/sewage treatment, etc. It can solve the problems of frequent regeneration of ion exchange method and low water utilization rate of chemical precipitation method, so as to avoid regeneration Frequent, solve the waste of resources, reduce the effect of waste of resources

Inactive Publication Date: 2007-07-04
海宁市海整整流器有限公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the deficiencies in the above-mentioned prior art, and proposes a comprehensive utilization technology of electroplating silver cleaning water. Frequent regeneration problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A certain Electronics Co., Ltd. discharges 2 tons of silver-containing rinse water (about 10ppm-20ppm silver) per hour, and the conductivity is about 500μ. Pre-treatment is carried out first, using a bag filter with a pore size of 50 μm and a security filter with a pore size of 5 μm to filter, and then reverse osmosis treatment, using RO membrane for secondary concentration, and the concentration factor is 8 times. After the above treatment, the conductivity of RO water is ≤200 μ, and the water The reuse rate is ≥90%; the concentrated water continues to be concentrated, the concentration ratio is 15 to 30 times, and the silver content is above 2000ppm. Adjust the pH value of the concentrated solution to 10-11, add sodium hypochlorite that is 8 times the weight of -CN, and the reaction time is 15 minutes; then adjust the pH value to near neutrality, and then add sodium hypochlorite, usually, the reaction time is 10 minutes . After breaking the cyanide, add the density o...

Embodiment 2

[0023] A certain electroplating company discharges 1 ton of silver-containing rinse water (about 30ppm-80ppm silver) per hour, and the conductivity is about 800μ. Pre-treatment is performed first, using a bag filter with a pore size of 50 μm and a security filter with a pore size of 5 μm, and then performing reverse osmosis treatment, using RO membrane for secondary concentration, and the concentration factor is 8 times. The usage rate is ≥82%; concentrated water continues to be concentrated, and the concentration ratio is 8 to 30 times. At this time, the silver content is above 2000ppm. Adjust the pH value of the concentrated solution to 10-11, add sodium hypochlorite that is 8 times the weight of -CN, and the reaction time is 15 minutes; then adjust the pH to near neutrality, and then add sodium hypochlorite, usually, the reaction time is 10 minutes. After breaking the cyanide, add the density of 1.12g / cm under constant stirring 3 The hydrochloric acid makes the silver chlo...

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Abstract

A cleaning water comprehensive technology for electrosilvering is carried out by filtering, concentrating, disposable breaking cyanogens, secondary breaking cyanogens, depositing, washing, replacing and purifying. Its advantages include low utilization rate, higher water resource recovery rate and metal silver recovery rate.

Description

technical field [0001] The invention belongs to a comprehensive utilization technology of electroplating wastewater, in particular to a comprehensive utilization technology of electroplating silver cleaning water. Background technique [0002] As a whole-process pollution control strategy, cleaner production has become a new concept and strategy of environmental protection in the 21st century. It focuses on fundamentally solving environmental problems and realizing sustainable economic and social development. It emphasizes "source reduction" of waste, ie preventing waste before it is generated. Enterprises start from product design, raw material selection, process reform, technological progress and production management to maximize the conversion of raw materials and energy into products, reduce the waste of resources, and minimize the pollutants discharged during the production process and their environmental impact change. In this way, most of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/44C02F1/72C02F1/62C22B11/00C02F103/16
Inventor 钱克邦
Owner 海宁市海整整流器有限公司
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