Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group ib metal
Patent
1989-04-24
1992-08-11
Russel, Jeffrey E.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group ib metal
75713, 75741, 75744, 423 34, 423 38, 423507, C01B 714, C01G 700, C22B 1100
Patent
active
051377004
ABSTRACT:
Aqueous iodine-iodide etching solutions are employed in the recovery of precious metals. Elemental iodine is precipitated from spent etching solutions and used to supply both the iodine and iodide of new etching solutions. Prior to extraction of the elemental iodine, used solutions, if not substantially contaminated, may be oxidized and recycled for further precious metal recovery. Aqueous etching solutions of hydriodic acid and iodine, or of ammonium iodide and iodine may be employed. Etching in such solutions, as well as in solutions of iodine and an alkali metal iodide, such as potassium iodide, may be accelerated by the use of small amounts of hydrogen peroxide (or equivalents) during etching.
REFERENCES:
patent: 861535 (1907-07-01), Pritchard
patent: 971252 (1910-09-01), Clancy
patent: 1857664 (1932-05-01), Schlotier
patent: 1907975 (1933-05-01), Jones
patent: 2304823 (1942-12-01), Harrison
patent: 3431068 (1969-03-01), Burk
patent: 3495976 (1970-02-01), Bazilevsky et al.
patent: 3576620 (1971-04-01), Wilson
patent: 3625674 (1971-12-01), Jacobs
patent: 3709681 (1973-01-01), Wilson
patent: 3778252 (1973-12-01), Wilson
patent: 3826750 (1974-07-01), Wilson
patent: 3885955 (1975-05-01), Lutz et al.
patent: 3957505 (1976-05-01), Homick et al.
patent: 4190489 (1980-02-01), Bahl et al.
patent: 4256704 (1981-03-01), Howard
patent: 4260451 (1981-04-01), Schmeckenbecher
patent: 4319922 (1982-03-01), Macdonald
patent: 4319923 (1982-03-01), Falanga et al.
patent: 4397690 (1983-08-01), Vanderpool et al.
patent: 4557759 (1985-12-01), McGrew et al.
patent: 4670052 (1987-06-01), Stanley et al.
patent: 4734171 (1988-03-01), Murphy
Sloan, "New Precious Metal Reclamation Process Based On Iodide-Iodine Etching Solutions", Oct. 8, 1985.
Cotton et al., Advanced Inorganic Chemistry, 3rd ed. Interscience Publishers. 1972. pp. 464-465.
Handbook of Preparative Inorganic Chemistry, 2nd ed., Braver, ed. Academic Press. 1963. vol. 1, pp. 289-290.
Encyclopedia of Chemical Reactions. Jacobson, ed. Reinhold Publishing Corp. 1949. vol. III, p. 720.
Russel Jeffrey E.
Shapiro Nelson H.
LandOfFree
Processes employing iodine-iodide etching solutions does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Processes employing iodine-iodide etching solutions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Processes employing iodine-iodide etching solutions will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-344961