US3661517A
A source of copper carbonate is obtained, such as by the treatment of a spent alkaline etchant solution with an acid, such as H2SO4. The resulting copper carbonate slurry is dried and put into a reactor. The exact amount of water to form CuSO4 . 5H2O is added to the reactor and then sulfuric acid is slowly added with agitation until the correct amount of H2SO4 is added to make …
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