ELECTROLYSIS APPARATUS FOR ELECTROLYTIC COPPER FOIL AND ELECTROLYTIC COPPER FOIL PRODUCED IN THE ELECTROLYSIS APPARATUS

摘要

Electrodeposition Apparatus for Producing Electrodeposited Copper Foil and Electrodeposited Copper FoilProduced by Use of the Apparatus AbstractAn object of the invention is to provide a method for continuously producing electrodeposited copper foil whipthiourea-decomposed products remaining in copper electrolyte are removed through activated carbon treatment. Anotherobject is to provide high-resistivity copper foil obtained through the method. To attain the objects, the presentinvention provides an electrodeposition apparatus including a path for circulating a copper sulfate solution; the pathbeing provided for performing electrolyzing in. an electrodeposition cell a composition-adjusted, thiourea-added copper sulfate solution, to thereby produce electrodeposited copper foil; feeding, after completion of elect~rodeposition, a spent solution discharged from the electrodeposition cell to a copper dissolution tower, to thereby serve as a sulfuric acid solution for dissolving copper and prepare a high copper-concentration copper sulfate solution: incorporating an additive into the high: copper-concentration copper sulfate solution, to thereby prepare a composition-adjusted copper sulfate solution; and feeding the composition-adjusted copper sulfate solution to the electrodeposition cell, to thereby serve as an electrolyte again; characterized in that, in an upstream position in relation to the copper dissolution tower where the spent solution fed from the electrodeposition cell is which electrodeposition has been completed is introduced, there is provided a filtration means; i.e., a circulation filtration apparatus which can perform circulation-filtration treatment for 30 minutes or longer or an ultrafiltration apparatus.Fig: 2