Method for resource utilization and innocent treatment of etching waste liquid containing copper in circuit board industry

A technology of harmless treatment and copper etching, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as temporary treatment but not root cause, environmental pollution, etc., and achieve environmental pollution Less, low operating cost, simple control of water washing volume and temperature difference

Active Publication Date: 2012-07-18
惠州TCL环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main disadvantage of this process is that the reagents are added in each step and the reaction is aerated, resulting in a large amount of ammonia nitrogen gas floating in the air, which is not a cure for the symptoms, but still pollutes the environment

Method used

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  • Method for resource utilization and innocent treatment of etching waste liquid containing copper in circuit board industry
  • Method for resource utilization and innocent treatment of etching waste liquid containing copper in circuit board industry
  • Method for resource utilization and innocent treatment of etching waste liquid containing copper in circuit board industry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Step A: (1) 1. Get 50 liters of the acidic copper-containing etching waste liquid detected in Table 1, use 100 mesh filter cloth to filter the acidic copper-containing etching waste liquid, and remove the suspended matter in the acidic etching waste liquid, 2. Filter the The acidic copper-containing etching waste liquid is slowly added dropwise to a height of 20 centimeters, and the volume is in the diisooctyl sulfide extraction and leaching resin column of 240 cubic centimeters, and the residence time of the waste liquid at the diisooctyl sulfide extraction and leaching resin column is In 2 minutes, the acidic copper-containing etching waste liquid passed through the diisooctyl sulfide extraction resin column is the etching waste liquid after arsenic removal, and 3. the acidic copper-containing etching waste liquid after removing arsenic is analyzed and detected, and The arsenic content is 1.3ppm, and the removal rate of arsenic is 92.7%; (2) 1. get 50 liters of alkalin...

Embodiment 2

[0051] In addition, the composition of the circuit board acid and alkali copper-containing etching waste solution is shown in Table 2.

[0052] Table 2 Composition of acid and alkali copper-containing etching waste liquid

[0053] Cu 2+ (g / L) Cl - (g / L) pH value As (mg / L) Acidic etching waste 115.90 253.67 -0.94 20 Alkaline etching waste liquid 96.12 148.76 8.85 15.5

[0054] Step A: (1) 1. Get 1 ton of the acidic copper-containing etching waste liquid detected in Table 2, and use a 70-purpose filter cloth to filter the acidic copper-containing etching waste liquid to remove suspended objects in the acidic etching waste liquid. The acidic copper-containing etching waste liquid is slowly added dropwise to a height of 1 meter, and the volume is in the diisooctyl sulfide extraction and leaching resin column of 12 cubic meters. The residence time of the waste liquid in the diisooctyl sulfide extraction and leaching resin c...

Embodiment 3

[0059] In addition, the components of the circuit board acid and alkali copper-containing etching waste liquid are shown in Table 3.

[0060] Table 3 Composition of acid and alkali copper-containing etching waste liquid

[0061] Cu 2+ (g / L) Cl - (g / L) pH value As (mg / L) Acidic etching waste 108.37 245.32 -0.99 21.5 Alkaline etching waste liquid 84.54 145.38 8.84 16

[0062]Step A: (1) ① get 10 tons of acidic copper-containing etching waste liquid detected in table 3, use 50 purpose filter cloth to filter acidic copper-containing etching waste liquid, remove suspended matter in the acidic etching waste liquid, ② filtered The acidic copper-containing etching waste liquid is slowly added dropwise to a height of 1 meter, and the volume is in the diisooctyl sulfide extraction and leaching resin column of 12 cubic meters. The residence time of the waste liquid in the diisooctyl sulfide extraction and leaching resin column is...

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Abstract

The invention discloses a method for resource utilization and innocent treatment of etching waste liquid containing copper in the circuit board industry. The method comprises the following steps of: pre-treating acid etching waste liquid containing the copper and alkali etching waste liquid containing the copper; performing a neutralization reaction of the pre-treated etching waste liquid to generate copper sulphate and basic copper chloride, recovering the copper from remaining wastewater containing low-concentration copper through absorption by adopting an ion exchange technology after mostcopper is recovered, and obtaining a regenerated copper chloride raw material after resin desorption; and evaporating remaining copper-free wastewater, i.e. ammonia nitrogen wastewater, by using a multi-effect evaporator to recover an ammonium chloride product which can be used as a regenerated etching liquid, and discharging the remaining wastewater up to the standard. By the method, the pollution problem of heavy metal ions to the environment is solved, and cyclic utilization of the waste liquid for production of other products can be realized, so the resources are saved and the environmentis protected.

Description

technical field [0001] The invention relates to a method for treating circuit board waste liquid, in particular to a method for resource utilization and harmless treatment of copper-containing etching waste liquid in the circuit board industry. Background technique [0002] Printed circuit board etching waste (also known as PCB etching waste) includes acidic copper-containing etching waste and alkaline copper-containing etching waste, copper sulfate or alkaline chloride produced from printed circuit board copper-containing etching waste Copper products not only have strict requirements on the arsenic content of the product, but also the control of reaction conditions is particularly important in the production process. Furthermore, if the waste liquid after the reaction is not treated and discharged arbitrarily, it will cause eutrophication of the water body and pollute the water quality , so the follow-up treatment of waste liquid is also very important in the harmless trea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C01G3/10C01G3/05C01C1/16A23K1/175A23K20/20
Inventor 王治军徐晶
Owner 惠州TCL环境科技有限公司
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