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Method and apparatus for recovering copper oxide from copper-containing acidic waste liquids

A technology of acid waste liquid and copper oxide, which is applied in chemical instruments and methods, copper oxide/copper hydroxide, oxidized water/sewage treatment, etc., can solve the problems of difficult treatment methods and low copper recovery rate, and achieve the goal of reducing the concentration Effect

Inactive Publication Date: 2015-03-04
SWING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, there is a problem that the copper recovery rate of recovering copper from waste liquid is low.
In addition, waste liquid containing iron ions eluted due to the reaction with copper ions and remaining copper ions remains, so this waste liquid needs to be treated separately, and it is difficult to say that it is an effective treatment method.

Method used

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  • Method and apparatus for recovering copper oxide from copper-containing acidic waste liquids
  • Method and apparatus for recovering copper oxide from copper-containing acidic waste liquids
  • Method and apparatus for recovering copper oxide from copper-containing acidic waste liquids

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] In Example 1, copper chloride etching waste liquid (hereinafter referred to as copper etching waste liquid) was used as the copper-containing acidic waste liquid, and an aqueous sodium carbonate solution was used as the alkaline agent. In order to make the pH value in the mixing reaction tank at the moment of completion of the treatment (reaction end) higher than 7, for the amount of copper etching waste liquid required to neutralize the 15% by weight sodium carbonate aqueous solution used to pH7, it is stipulated that the final flow into the mixing reaction tank The cumulative injection amount of copper etching waste liquid supplied was 0.8 equivalent of copper etching waste liquid. In addition, the injection operation of copper etching waste liquid necessary for neutralizing the sodium carbonate aqueous solution into the mixing reaction tank was performed in eight steps.

[0055]

[0056] Before the treatment, a neutralization treatment test was performed in order t...

Embodiment 2

[0062]In Example 2, a mixed solution of a 15% by weight sodium carbonate aqueous solution and a 25% by weight sodium hydroxide aqueous solution was used as an alkali agent. Same as Example 1, in order to make the pH value in the mixing reaction tank at the end of the treatment (reaction end) moment higher than 7, for the amount of copper etching waste liquid required to neutralize the alkaline agent used to pH7, determine the final mixing reaction tank. The cumulative injection amount of copper etching waste liquid supplied to the reaction tank was 0.8 equivalent of copper etching waste liquid. In addition, the injection operation of the copper etching waste liquid necessary for neutralizing the alkaline agent into the mixing reaction tank was performed in eight steps.

[0063]

[0064] Before the treatment, a neutralization treatment test was carried out in order to determine the minimum amount of alkaline agent required for the predetermined amount of copper etching waste ...

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Abstract

The present invention pertains to a method and apparatus for removing and recovering, as copper oxide, copper from a copper-containing acidic waste liquids, which contain copper ions in high concentration, said copper-containing acidic waste liquids including renewed waste liquid from a plating bath solution for manufacturing electrolytic copper foil, and etching waste liquid produced when etching copper printed circuit boards with a cupric chloride etchant. The present invention is a method in which: copper-containing acidic waste liquid is poured into and mixed with an alkaline solution having a volume at least sufficient to neutralize the copper-containing acidic waste liquid, generating a suspension containing solids composed mainly of copper oxide; and the solids composed mainly of copper oxide are then separated from the suspension, and recovered. A solution of alkali metal carbonates is used as the alkaline solution into which the copper-containing acidic waste liquid is poured.

Description

technical field [0001] The invention relates to a method and a device for recovering copper oxide from copper-containing acidic waste liquid, more specifically, relates to, for example, etching waste liquid and electrolytic copper produced when copper printed circuit boards are etched with copper chloride etching liquid. In copper-containing acidic waste liquids containing high concentrations of copper ions, such as renewal waste liquids of plating liquids in foil manufacturing, etch waste liquids generated by roughening of substrate surfaces in the lamination process of multilayer printed circuit boards A method and apparatus for removing and recovering copper as copper oxide. Background technique [0002] As acidic waste liquid containing copper ions in a high concentration (hereinafter referred to as "copper-containing acidic waste liquid"), there are known etching waste liquids generated when copper printed circuit boards are etched with copper chloride etching liquid, ...

Claims

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Application Information

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IPC IPC(8): C01G3/02C02F1/62C22B3/44C22B7/00C22B15/00
CPCC02F1/66C02F1/72C02F2103/16C01G3/02C02F2101/20C02F2209/02C02F1/5236C01P2006/80C22B15/0089
Inventor 小林琢也小林厚史加纳一宪铃木利宏
Owner SWING
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