Patent ID: 9597754
Date: 2017-03-21
CPC Classifications: B23K,C22C,C25C,H01L

Claim:
1. A method of producing a copper of low α-ray radiation, comprising the steps of: preparing an electrolytic cell comprising a copper sulfate solution as a starting electrolytic solution, a positive electrode and a negative electrode, and a diaphragm positioned in the electrolytic cell to partition the electrolytic cell into a positive electrode side containing the positive electrode and a negative electrode side containing the negative electrode; performing electrolysis with the electrolytic cell equipped with a crude copper raw material as the positive electrode to obtain an anolyte solution formed by anodic dissolution of the crude copper raw material; extracting and filtering an amount of the anolyte solution to remove lead sulfate precipitates contained in the extracted anolyte solution and to obtain a filtered anolyte solution; bringing back the filtered anolyte solution to the negative electrode side of the electrolytic cell and performing electrolysis to form an electrodeposited copper on the negative electrode; and collecting the electrodeposited copper from the negative electrode and melting and casting the electrodeposited and collected copper to form the copper of low α-ray radiation; wherein the copper of low α-ray radiation has an α-ray count of 0.001 cph/cm