Regenerated acidic etching solution, copper recycling method and special device thereof

An acid etching solution and copper recovery technology, applied in the improvement of process efficiency, photographic technology, instruments, etc., can solve the problems of inconvenient operation, waste of resources and environment, unable to recover hydrochloric acid, etc., to reduce waste water discharge and increase the use of Longevity and the effect of realizing resource utilization

Inactive Publication Date: 2010-07-07
青海复绿生态科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of alkali will be consumed during neutralization and precipitation, only the copper in it can be recovered, hydrochloric acid cannot be recovered, and a large amount of waste water is generated which is difficult to handle, resulting in waste of resources and environmental pollution; conventional electrolysis methods avoid Cu in the cathod

Method used

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  • Regenerated acidic etching solution, copper recycling method and special device thereof
  • Regenerated acidic etching solution, copper recycling method and special device thereof

Examples

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Embodiment 1

[0021] A method for regenerating acidic etching solution and reclaiming copper, adopting polyethylene cation exchange membrane 5 to divide rectangular polyethylene plastic electrolytic cell into three chambers of anode chamber 1, intermediate chamber 2 and cathode chamber 3, adding concentration of 5% sulfuric acid solution, add acidic etching waste liquid in the middle chamber 2, add copper sulfate solution with a copper ion concentration of 30g / L in the cathode chamber 3, use the lead-tin-calcium alloy plate as the anode electrolysis plate 6, and the stainless steel plate as the cathode electrolysis plate plate 7. The pole spacing between the two electrolytic plates is 110mm, the temperature is normal temperature, the voltage is 3V and the current density is 500A / m 2 . After 8 hours after electrolysis, when the copper ion concentration of the acidic etching waste solution drops below 1g / m, it can be returned as an etching solution for recycling.

[0022] The special device...

Embodiment 2

[0024] A method for regenerating acidic etching solution and recovering copper, using a polyvinylidene fluoride cation exchange membrane 5 to divide a rectangular polyethylene plastic electrolytic cell into three chambers: an anode chamber 1, an intermediate chamber 2, and a cathode chamber 3, and adding Concentration is 10% sulfuric acid solution, add acidic etching waste liquid in middle chamber 2, add copper sulfate solution that copper ion concentration is 40g / L in cathode chamber 3, take lead-tin-calcium alloy plate as anode electrolytic plate 6, stainless steel plate as Cathode electrolytic plate 7. The pole spacing between the two electrolytic plates is 150mm, the temperature is normal temperature, the voltage is 5V and the current density is 800A / m 2 . After 6 hours after electrolysis, when the copper ion concentration of the acidic etching waste solution drops below 1g / m, it can be returned as an etching solution for recycling.

[0025] The special device for the me...

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PUM

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Abstract

The invention discloses regenerated acidic etching solution, a copper recycling method and a special device thereof, belonging to the field of electrochemically recycling waste solution and nonferrous metal. An electrolytic tank in electrochemical treatment is divided into an anode chamber, an intermediate chamber and a cathode chamber. Dilute sulfuric acid solution is contained in the anode chamber, and a lead-tin-calcium alloy plate is adopted as an anode electrolytic plate. Waste acidic etching solution is contained in the intermediate chamber. Copper sulfate solution is contained in the cathode chamber, and a stainless steel plate is adopted as a cathode electrolytic plate. Under the function of an electric field, copper is dissolved out from a copper sulfate system. Water in the anode chamber is oxidized to generate oxygen gas and hydrogen ions. When the concentration of the copper ions is reduced to 1g or lower than 1g, the etching solution can be used anew. The method greatly reduces the production cost and causes no atmospheric pollution at the same time as realizing the recycling.

Description

technical field [0001] The invention relates to a method for regenerating acidic etching solution, which relates to a method for recovering metal copper in acidic etching solution by direct electrolysis and regenerating and recycling the acidic etching solution. It belongs to the field of waste liquid resource treatment and non-ferrous metal recovery. Background technique [0002] All over the world, the electrical and electronic industry is one of the fastest growing industries. As an important part of electrical and electronic products, the output of printed circuit boards (PCB) is increasing day by day, resulting in a large amount of circuit board etching waste production and emissions. [0003] Acidic etching solution is an etching solution suitable for fine line production and inner layer production of multi-layer boards because of its characteristics of small side erosion, easy control of etching rate and easy regeneration. After the circuit board is pasted, exposed,...

Claims

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Application Information

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IPC IPC(8): C23F1/46C25C1/12
CPCY02P10/20
Inventor 张承龙毛文雄
Owner 青海复绿生态科技有限公司
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