Method and apparatus for removing and recovering copper from copper-containing acidic waste liquid and method for producing copper-containing substance
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United States of America Patent
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Jan 26, 2016
Grant Date -
Nov 25, 2010
app pub date -
Aug 28, 2008
filing date -
Jan 15, 2008
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Abstract
The present invention relates to a method and apparatus for removing and recovering copper by treating an acidic waste liquid containing copper ions such as an etching waste liquid resulting from etching a copper printed board in an etching solution of cupric chloride and a waste liquid after renewing a plating bath liquid in producing electrolytic copper foil. In particular, a copper recovering method of recovering copper from a copper-containing acidic waste liquid includes adding a liquid mixture of a copper-containing acidic waste liquid and an oxidizing agent to an alkaline agent solution while a pH of the alkaline agent solution to which the liquid mixture has been added is being controlled so as never to decrease to seven or lower, and by obtaining a solid material whose main component is copper oxide.
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