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Copper separation system for strong-oxidation high-acidity copper-containing waste liquid

A separation system, high oxidation technology, applied in the direction of separation method, dispersed particle separation, centrifugal separation water/sewage treatment, etc., can solve the problems that cannot be popularized and used, difficult to filter, etc., achieve shortened filtration time, long life, reduce The effect of operating and maintenance costs

Pending Publication Date: 2020-03-20
深圳星河环境股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the fact that the copper oxalate precipitation particles are powdery, small and easy to block the filter cloth, it is extremely difficult to filter, so that the oxalic acid precipitation method cannot be widely used in the recycling of high acidity copper-containing waste liquid. So far, there is no feasible industrial technology to completely solve the oxalic acid. Copper Precipitation High Efficiency Filtration Problems

Method used

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  • Copper separation system for strong-oxidation high-acidity copper-containing waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Take 1m from a PCB company 3 Copper-containing deplating waste nitric acid is transported to the reaction kettle 11 through the waste liquid feed pump 13, the reaction kettle 11 is turned on for stirring, and an oxalic acid solution is added from the oxalic acid dispensing tank 12 to the reaction kettle 11 to precipitate copper ions to obtain a copper oxalate precipitation mixed solution. After the above reaction for 2 hours, open the reaction liquid outlet of the reaction kettle 11, turn on the reaction liquid feed pump 25, and the copper oxalate precipitation mixed liquid enters the membrane concentration system, and is concentrated and separated by cross-flow through the first-stage tubular silicon carbide ceramic membrane 21 , to obtain the concentrated solution and the permeate of the first-level copper oxalate precipitation mixed solution, the concentrated solution of the first-level copper oxalate precipitation mixed solution is then passed through the second-leve...

Embodiment 2

[0048] Take 1m 3 The PCB acid etching waste liquid containing Cu 100g / L and HCl 2mol / L produced by a PCB company was tested with oxalic acid as the copper precipitation agent for comparison, and the operation was the same as above. The copper separation system takes 0.7 hours, and there is no waste gas emission during the test process, which is environmentally friendly. The chamber filter press takes 4.5 hours. During the test, the filter press emits exhaust gas and pollutes the environment. The results show that the efficiency of the copper separation system is significantly improved, and the environment is friendly; the test obtained a regenerated acidic etching solution containing 3g / L of copper ions, and used the regenerated acidic etching solution to prepare an acidic etching solution. The test results fully meet the requirements of the existing etching solution. While recovering copper, it can also achieve the purpose of acid solution recycling.

Embodiment 3

[0050] Take 1m 3 A PCB company produced 15% nitric acid, Cu 2+ 11.3g·L -1 , Fe 3+ 23.5g·L -1 , Sn 2+ / Sn 4+ 110g·L -1 The nitric acid type tin stripping waste liquid is tested with oxalic acid as the copper precipitation agent, and the relevant reactions are as follows:

[0051] Cu 2+ +H 2 C 2 o 4 →CuC 2 o 4 ↓+2H +

[0052] 2Fe 3+ +3H 2 C 2 o 4 → Fe 2 (C 2 o 4 ) 3 ↓+6H +

[0053] Sn(OH) 6 2- +2H + →Sn(OH) 4 ↓+2H 2 o

[0054] Add oxalic acid solution according to the 90% amount measured by the reaction formula, and stir the reaction time for 2 hours for a comparative test. The copper separation system takes 0.5 hours, and there is no waste gas emission during the test process, which is environmentally friendly. The box filter press takes 5 hours, and the filter press emits exhaust gas during the test process, which pollutes the environment. The results show that the efficiency of the copper separation system is significantly improved, and the env...

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Abstract

The invention discloses a copper separation system for strong-oxidation high-acidity copper-containing waste liquid. The copper separation system comprises a PLC control system, a copper deposition reaction system connected with the PLC control system, a membrane concentration system, a centrifugal system, a waste gas recovery system and a backwashing system; the copper deposition reaction systemcomprises a precipitator feed port and a waste liquid feed port, and a reaction liquid discharge port of the copper deposition reaction system is connected with a reaction liquid feed port of the membrane concentration system; a concentrated solution discharge port of the membrane concentration system is connected with a concentrated solution feed port of the centrifugal system, and a permeate liquid discharge port of the membrane concentration system is connected with a feed port of the backwashing system; the centrifugal system further comprises a centrifugal liquid discharge port, and the centrifugal liquid discharge port is connected with the feed port of the backwashing system; a backwashing liquid outlet of the backwashing system is connected with a permeate liquid outlet of the membrane concentration system; and the copper deposition reaction system and the centrifugal system are both provided with waste discharge ports connected with the waste gas recovery system. According tothe technical scheme, efficient separation of the copper oxalate precipitate is achieved.

Description

technical field [0001] The invention relates to the field of waste water treatment equipment, in particular to a copper separation system for strongly oxidizing high-acidity copper-containing waste liquid. Background technique [0002] In the PCB or electroplating industry, the acid commonly used in the stripping rack deplating solution is high-concentration nitric acid. With the continuous use of the stripping solution in the stripping process, it can be known from the chemical reaction balance that when the copper content in the stripping solution reaches a certain concentration, the reaction will be inhibited, the stripping efficiency will be reduced, and copper-containing stripping nitric acid will be produced. In the process of PCB tin stripping, when the tin content of the tin stripping solution reaches a certain concentration (usually higher than 100g / L), similarly, the tin stripping ability will also decrease, resulting in tin stripping waste liquid. The tin strippi...

Claims

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Application Information

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IPC IPC(8): C02F9/04B01D53/78B01D53/40C02F1/38C02F1/44C02F1/52C02F101/20C02F103/16
CPCC02F9/00B01D53/78B01D53/40C02F1/5236C02F1/38C02F1/44C02F2101/20C02F2103/16C02F2301/08C02F2209/005C02F2101/203
Inventor 谈珏宋传京陆严宏叶自洁杨江丽胡剑波
Owner 深圳星河环境股份有限公司
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