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Copper recovery form etching waste liquid of circuit board

A recovery method and a technology for etching waste liquid are applied in the field of copper recovery in waste liquid to achieve good economic and environmental benefits, simplify processes and reduce energy consumption.

Inactive Publication Date: 2008-10-22
DONGGUAN GUANGHUA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Domestic research has just begun. For example, an electronics company has adopted a similar process for the etching waste liquid of the factory, and obtained copper sulfate after sulfuric acid stripping, which was further recovered by electrolysis, which met the requirements of clean production, but the extraction and recovery of copper stripping Directly obtaining copper sulfate crystals and recovering copper in alkaline etching waste liquid by extraction method has not been reported

Method used

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  • Copper recovery form etching waste liquid of circuit board
  • Copper recovery form etching waste liquid of circuit board

Examples

Experimental program
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Effect test

example 1

[0051] Using 50% N910 kerosene solution as the extraction agent, the extraction ratio O / A=3.6 / 1, the etching solution is extracted on a Φ20 centrifugal extractor for 5 stages, and the etching solution and the organic phase are pumped proportionally by metering pumps Put into the extractor and carry out continuous extraction, the loading capacity of outlet organic phase copper is 22.5 g / liter, carry out 2 grades of water washings with loading organic phase, wash away chloride ion; In the water phase, copper ion concentration is 0.087 g / L, and the water phase further After degreasing with glass fiber and activated carbon, it can be used as etching solution again. Heat the loaded organic phase to 55°C, use 5M sulfuric acid to stir and strip for 20 minutes under the condition of O / A=2.4 / 1, stop stirring; carry out phase separation under heat preservation conditions, and analyze the organic phase and strip water respectively Phase copper ion concentration, obtains its back extracti...

example 2

[0054] Using 50% N902 kerosene solution as the extraction agent, the extraction ratio O / A=3.5 / 1, the etching solution is extracted on a Φ20 centrifugal extractor for 5 stages, and the etching solution and the organic phase are pumped proportionally by metering pumps Put into the extractor and carry out continuous extraction, the loading capacity of outlet organic phase copper is 26.2 grams / liter, carries out 2 grades of water washings with load organic phase, washes away chloride ion; In the water phase, copper ion concentration is 0.089 grams / liter, and the water phase further After degreasing with glass fiber and activated carbon, it can be used as etching solution again. The loaded organic phase was heated to 600C, and the crystallization mother liquor obtained by using Example 1 was formulated into a copper-containing 10 g / liter 5M sulfuric acid solution, stirred and stripped for 20 minutes under the condition of O / A=2.2 / 1, and stopped stirring; Carry out phase separation ...

example 3

[0057] Using 50% M5640 kerosene solution as the extraction agent, the extraction ratio O / A=3.2 / 1, the etching solution is extracted on a Φ2 centrifugal extractor for 5 stages, and the etching solution and the organic phase are pumped proportionally by metering pumps Put into the extractor and carry out continuous extraction, the loading capacity of outlet organic phase copper is 23.2 g / liter, carry out 2 grades of water washings with loading organic phase, wash away chloride ion; In the water phase, copper ion concentration is 0.075 g / L, and the water phase further After degreasing with glass fiber and activated carbon, it can be used as etching solution again. Heat the loaded organic phase to 50°C, use 5M sulfuric acid solution containing 10 g / L, stir and back-extract for 30 minutes under the condition of O / A=2.2 / 1, stop stirring; carry out phase separation under heat preservation conditions, The concentration of copper ions in the organic phase and the stripped water phase w...

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Abstract

The invention provides a method for recovering copper from circuit board etching solution. The method comprises the following steps: A. according to a certain ratio, the etching solution and organic phase are pumped in a centrifugal extractor for continuous extraction, obtaining organic phase carrying copper and water phase; extracting agent is of aldoxime copper extracting agent, the volume ratio between the organic phase and the water phase is 1 to 5:1, and the number of extraction stages are 3 to 8 stages; B. the organic phase carrying copper undergoes 1 to 3 stages of water washing; C. the organic phase carrying copper undergoing the water washing undergoes sulfuric acid stirring back extraction, and after phase separation, the organic phase and the back extraction water phase are obtained; D. the back extraction water phase is cooled and crystallized, and undergoes centrifugal separation for obtaining copper sulfate products and copper sulfate crystallization mother liquors. The method has the advantages that metallic copper can be recovered from the alkali etching solution by extraction, thereby realizing an aim of cyclic utilization of the treated waste solution, greatly lowering energy consumption, simplifying process, easily being popularized among practical manufacturers and creating excellent benefit and environmental benefit.

Description

【Technical field】 [0001] The invention relates to a treatment method for circuit board etching waste liquid, in particular to a method for recovering copper in the waste liquid. 【Background technique】 [0002] my country has nearly 60 million tons of copper resource reserves, of which industrial reserves are about 30 million tons. Although the total resources occupy the fourth place in the world, it is only 0.5 tons of copper per capita. As a resource-poor country, it needs a large amount of copper imports. Meet the requirements of national economic development. [0003] At present, the output of electrical copper produced in my country is about 3 million tons, and the domestic consumption of electrical copper is more than 4 million tons. It is necessary to import millions of tons of copper to meet domestic demand. In recent years, the international copper price has soared. The current copper price has reached more than 50,000 yuan / ton, and the cost of importing copper is mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/30C22B15/00C22B3/22
CPCY02P10/20
Inventor 朱国才肖红星
Owner DONGGUAN GUANGHUA CHEM
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