Complex copper waste liquid and micro-etching waste liquid composite treatment method

A composite treatment and complex copper technology, applied in filtration treatment, precipitation treatment, water/sewage treatment and other directions, can solve the problems of affecting the extraction effect, consumption of large acids and oxidants, high cost, and achieve cost reduction, purity and high quality. , high-value effects

Active Publication Date: 2021-01-12
SHENZHEN SHENTOU ENVIRONMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] CN 107892322 A proposes the method of "ion exchange adsorption - pickling resin to obtain copper regeneration solution - evaporation and concentration of copper regeneration solution - cooling and crystallization to recover copper sulfate" to treat copper-containing wastewater , due to the high acidity and oxidant content of the micro-etch waste liquid, it cannot be directly subjected to ion exchange resin adsorption treatment, and the patent does not disclose how to ensure the purity of the copper regeneration liquid
CN109112312 A proposes to adopt the method of "sodium sulfite reducing oxidant-organic extraction-electrolytic back-extraction solution" to reclaim cathode metal copper from copper micro-etching solution. As mentioned above, the electrolytic method can not discharge the effluent copper up to standard, and the method lacks the removal of organic matter step, the organic matter will affect the extraction effect and the extracted water still cannot meet the discharge standard
CN 103803744 B uses "iron powder reduction to obtain elemental copper-heavy metal scavenger to precipitate residual copper ions-adding oxidation to prepare polyferric sul...

Method used

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  • Complex copper waste liquid and micro-etching waste liquid composite treatment method
  • Complex copper waste liquid and micro-etching waste liquid composite treatment method
  • Complex copper waste liquid and micro-etching waste liquid composite treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] laboratory apparatus

[0072] Oxidative decomplexation reactor, 200mm×200mm×250mm, built-in 2 aeration heads and 2 UV lamps, externally connected to a water pump for internal circulation; solid phase extraction column, outer diameter (inner diameter) × height = 50(44) × 500mm Chromatographic column; deep flat electrolytic cell, 200mm×200mm×250mm, built-in aeration head and 8 flat electrode plates, externally connected to a water pump for internal circulation.

[0073] Step 1: Take 1L of electroless copper plating waste liquid from the circuit board factory into the reaction vessel, add 4L of micro-etching waste liquid, and turn on the aeration to fully mix. Add 50% liquid caustic soda to adjust the pH value of the mixed solution to 2.5 to generate a mixed suspension containing black copper oxide. Turn on the ultraviolet light source, slowly add 275ml of oxidizing agent at a volume ratio of 5.5%, and react for 2h.

[0074] Step 2: Suction filtration of the reaction eff...

Embodiment 2

[0081] laboratory apparatus

[0082] Oxidative decomplexation reactor, 200mm×200mm×250mm, built-in 2 aeration heads and 2 UV lamps, externally connected to a water pump for internal circulation; solid phase extraction column, outer diameter (inner diameter) × height = 50(44) × 500mm Chromatographic column; deep flat electrolytic cell, 200mm×200mm×250mm, built-in aeration head and 8 flat electrode plates, externally connected to a water pump for internal circulation.

[0083] Step 1: Take 1L of electroless copper plating waste liquid from the circuit board factory into the reaction vessel, add 6L of micro-etching waste liquid, and turn on the aeration to fully mix. Add 50% liquid caustic soda to adjust the pH value of the mixed solution to 2 to generate a mixed suspension containing black copper oxide. Turn on the ultraviolet light source, slowly add 560ml of oxidizing agent according to the volume ratio of 8%, and react for 2h.

[0084] Step 2: Suction filtration of the reac...

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Abstract

The invention relates to the technical field of wastewater treatment, in particular to a complex copper waste liquid and micro-etching waste liquid composite treatment method. The complex copper wasteliquid and micro-etching waste liquid composite treatment method comprises the following steps: firstly, carrying out oxidation complex breaking to remove organic matters, then carrying out solid-phase extraction to recover copper ions for preparing basic copper chloride, finally, adding a powdery active substance into extracted effluent, carrying out electrolytic reaction under an aeration condition, and then adding a precipitator to generate a wrappage. By means of the mode, combined treatment of the complexing copper waste liquid and the micro-etching waste liquid is achieved, copper ionsin the waste liquid are recycled, COD, P, NH3N, Cu, Ni and other indexes in reaction effluent obtained after wrappage is filtered meet the IV-class standard of surface water to be discharged. The treatment method is easy to control in reaction condition and good in treatment effect.

Description

【Technical field】 [0001] The invention relates to the technical field of waste water treatment, in particular to a composite treatment method of complexed copper waste liquid and micro-etching waste liquid. 【Background technique】 [0002] Expansion, degreasing, micro-etching, electroless copper plating, electroless copper deposition, etc. are all indispensable processes in the circuit board manufacturing process of the electronic information industry. The process produces a large amount of complexed copper waste liquid and non-complexed copper sulfate waste such as micro-etching. The liquid belongs to the HW17 and HW22 categories in the "National Hazardous Waste List". [0003] The complex copper waste liquid represented by electroless copper plating has the characteristics of alkalinity (pH>11), low copper concentration (20-4000mg / L), high concentration of organic matter (15000-50000mg / L), etc., which contains EDTA, Various organic additives such as potassium tartrate a...

Claims

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Application Information

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IPC IPC(8): C02F9/08C22B7/00C22B15/00C02F101/20C02F101/30
CPCC02F9/00C22B7/00C22B15/00C02F1/283C02F2001/007C02F1/32C02F1/26C02F1/42C02F1/5236C02F1/461C02F1/66C02F1/722C02F7/00C02F1/725C02F2101/30C02F2101/20C02F1/001Y02P10/20
Inventor 胡元娟彭娟陈刚吉飞宋少华张庆喜李钧赵陈冬张卫平郑帅飞
Owner SHENZHEN SHENTOU ENVIRONMENT TECH CO LTD
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