Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1976-09-27
1978-04-11
Vertiz, O. R.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
423 24, 156642, 134 10, C25C 112, B08B 704, C23G 136
Patent
active
040837580
ABSTRACT:
Copper values are recovered in metallic form from a solution containing such values along with chloride ions by, first, selectively removing the chloride ions from the solution, and then electrowinning the copper from the chloride-free solution. The process is particularly useful in recovering copper values from etching solutions in a metallic form, such as "wire-grade" metallic copper, that is available for fabrication into commercial copper products. The process is preferably applied to ammoniacal etching solutions derived from the manufacture of printed electronic circuit boards. As so applied, the chlorides are selectively removed by liquid-liquid extraction procedures, resulting in a substantially chloride-free, acidic stripping solution containing the copper values, which solution is subjected to electrolysis for winning copper metal. The aqueous raffinate from the extraction stage is treated for the removal of residual organic and is available for reuse as an etching solution when brought up to the necessary strength by addition of ammonia.
REFERENCES:
patent: 3216873 (1965-11-01), Jones
patent: 3224873 (1965-12-01), Swanson
patent: 3440036 (1969-04-01), Spinney
patent: 3761249 (1973-09-01), Ritcey
patent: 3844857 (1974-10-01), Chiang
patent: 3971652 (1976-07-01), Bryson
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Hzkovitch et al "Copper Removal from Thompson Nickel Anolyte by Solvent Extraction" C.I.M. Bulletin, Jan. 1974, pp. 92-96.
Yannopoulos et al, Editors Extractive Metallurgy of Copper, AIME, N.Y., (1976), vol. II, pp. 1025-1038.
Solvent Extraction (Proceedings of I.S.E.C. 1971), vol. II, Society of Chemical Industry, London, 1971, pp. 1383, 1384.
Hamby Wayne D.
Slade Marvin Dale
Criterion
Hearn Brian E.
Vertiz O. R.
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