Process for recovering copper by processing acidic copper chloride etchant through rotational flow electrolysis

A swirl electrolysis, copper chloride technology, applied in the direction of photography process, photography auxiliary process, improvement of process efficiency, etc., can solve the problems of high consumption of reagents and poor economical type, and achieve less consumption of raw materials, low cost, and reduced cost. cost effect

Active Publication Date: 2012-04-18
浙江科菲科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the extraction electrowinning method consumes more reagents and is less economical.

Method used

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  • Process for recovering copper by processing acidic copper chloride etchant through rotational flow electrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Pour the 96% industrial concentrated sulfuric acid of 500ml into a 5L beaker, and then pour 3L of copper ion concentration of 100g / L and acidic copper chloride etching waste liquid of 200g / L into the separatory funnel Slowly add 1 drop / s into a 5L beaker, carry out acid displacement reaction at a reaction temperature of 180°C to obtain a solution containing copper sulfate crystals, add 1800ml of distilled water to dilute, and the diluted copper sulfate solution contains copper ions The concentration is 56g / L, and the concentration of chloride ion is 20g / L. Use suction filtration equipment to filter out suspended solids, organic matter and particulate impurities. The suction filtration speed is 1.1L / s. The obtained filtrate electrolyte flows from the circulation tank In the flow electrolysis device, copper is removed by swirl electrolysis, the volume of the electrolyte is 5.2L, and the current density is 1000A / m 2 , the flow rate of the electrolyte is 400L / h, electrolysi...

Embodiment 2

[0035] Pour 300ml of 98% industrial concentrated sulfuric acid into a 5L beaker, then pour 3L of acidic copper chloride etching waste liquid with a copper ion concentration of 130g / L and a chloride ion concentration of 180g / L into a separatory funnel Slowly add 3 drops / s into a 5L beaker, and carry out acid replacement reaction at a reaction temperature of 120°C to obtain a solution containing copper sulfate crystals, dilute with 1500ml of distilled water, and the diluted copper sulfate solution contains copper ions The concentration is 81g / L, and the concentration of chloride ion is 30g / L. Use suction filtration equipment to filter out suspended solids, organic matter and particulate impurities. The suction filtration speed is 0.9L / s. The obtained filtrate electrolyte flows from the circulation tank In the flow electrolysis device, copper is removed by swirl electrolysis, the volume of the electrolyte is 4.8L, and the current density is 800A / m 2 , the electrolyte flow rate is...

Embodiment 3

[0037] Pour 900ml of 98% industrial concentrated sulfuric acid into a 5L beaker, then pour 3L of acidic copper chloride etching waste liquid containing copper ion concentration of 120g / L and chloride ion concentration of 200g / L into the separatory funnel for 2 Slowly add dropwise into a 5L beaker at a rate of drop / s, and carry out acid replacement reaction at a reaction temperature of 150°C to obtain a solution containing copper sulfate crystals, dilute with 1500ml of distilled water, and the diluted copper sulfate solution contains copper ion concentration is 66.67g / L, and the chloride ion concentration is 10g / L. Use suction filtration equipment to filter out suspended solids, organic matter and particulate impurities. The suction filtration speed is 1.0L / s. The obtained filtrate electrolyte flows from the circulation tank In the flow electrolysis device, copper is removed by swirl electrolysis, the volume of the electrolyte is 5.3L, and the current density is 550A / m 2 , the ...

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Abstract

The invention relates to a process for recovering copper by processing an acidic copper chloride etchant through rotational flow electrolysis, belonging to the technical field of copper-containing waste liquid treatment. The process comprises the following steps of: taking acidic copper chloride etching wastewater as a raw material; obtaining a copper sulfate crystal at a temperature of 120-180 DEG C through using an acid replacement conversion system; dissolving the copper sulfate crystal by diluting with distilled water to obtain a copper sulfate solution; filtering the copper sulfate solution through precise filtering equipment to obtain a filtrate; de-coppering the filtrate through the rotational flow electrolysis; and scalding an obtained copper pipe with little acid. According to the process provided by the invention, a rotational flow electrolytic cell and assorted equipment are convenient to mount, dismount and move through a portable or modular assembly; the solution is circulated in a closed loop without emission of harmful gases; electrolytic deposition is selectively carried out on metal, and the copper can be purified in a better manner by using the rotational flow electrolysis technology; due to higher current density and efficiency, the reagent consumption is reduced, the production cost is reduced and the enterprise benefit is improved; and an effective and highly-pure electroextraction is carried out on the solution, therefore, the recovered copper is standard cathode copper with a total recovery rate of more than 96%.

Description

technical field [0001] The invention belongs to the technical field of copper-containing waste liquid treatment, and specifically relates to a process for recovering copper from acidic copper chloride etching liquid by swirl electrolysis with short flow, low cost, high efficiency and environmental protection. Background technique [0002] In recent years, my country's electronics industry has developed rapidly, and the production of printed circuit boards has gradually formed a large-scale industry in my country. In the etching process, the commonly used acidic etching solution is CuCl 2 Etchant and FeCl 3 etchant. Due to CuCl 2 Etching solution has the advantages of high etching capacity, high etching efficiency, low cost and relatively small environmental pollution, and is widely used by PCB factories. Therefore, the etching waste liquid produced during the etching process of printed circuit boards is a large amount of copper-containing etching waste liquid, and the ave...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/46C22B7/00C25C1/12C25C7/00
CPCY02P10/20
Inventor 邓涛侯新常林元吉甘海平彭强林吴燕吴燕丽
Owner 浙江科菲科技股份有限公司
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