Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Treating process fluid by means other than agitation or...
Patent
1997-02-24
1998-07-21
Gorgos, Kathryn L.
Electrolysis: processes, compositions used therein, and methods
Electrolytic coating
Treating process fluid by means other than agitation or...
205101, 205574, 205586, C25C 112, C25D 2118
Patent
active
057830576
ABSTRACT:
A method of purifying a copper electrolytic solution circulated in a copper electrorefining system, wherein a portion of the solution is withdrawn and recycled to the system after purification treatment. The purification treatment includes the addition of a hydrosulfide to the withdrawn solution to generate only the necessary quantity of hydrogen sulfide gas required in the reaction. The hydrogen sulfide gas generated is utilized for purification treatment. One process comprises dividing the solution withdrawn into two portions. Sodium hydrosulfide is added to the first portion to precipitate and separate metals as sulfides. Excess sodium hydrosulfide is further added to the first portion for reaction with residual sulfuric acid in the solution to generate hydrogen sulfide gas, then contacting the second divided portion with the hydrogen sulfide gas thus produced to precipitate and separate metals in the form of sulfides. The filtrate is then recycled to an electrorefining system. There is also provided a process comprising contacting the solution with hydrogen sulfide gas to separate and remove Cu, As, Sb and Bi in the form of sulfides from the solution, then dividing the solution into two portions; The first portion is recycled to the electrorefining system, whereas excess sodium hydrosulfide is added to the second portion to separate and recover Ni as nickel sulfide from the solution. Resultant hydrogen sulfide gas is used for contact with solution to be treated.
REFERENCES:
patent: 3883421 (1975-05-01), Cutting et al.
patent: 3917519 (1975-11-01), Fisher et al.
patent: 4404071 (1983-09-01), Abe et al.
Hiai Hiroshi
Ishii Toshinori
Tomita Masatoshi
Gorgos Kathryn L.
Leader William T.
Nippon Mining & Metals Co., Ltd.
LandOfFree
Method of purifying copper electrolytic solution does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of purifying copper electrolytic solution, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of purifying copper electrolytic solution will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1643625