Halogen tin electrodeposition bath sludge treatment

Details Halogen tin electrodeposition bath sludge treatment Halogen tin electrodeposition bath sludge treatment

1975-07-25

1977-02-01

Thomas, Earl C.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iva metal

204 54R, 423140, 423182, 423367, 423618, 423632, 423633, C01G 1902

Patent

active

040062139

ABSTRACT:
A process for the extraction and recovery of hydrated stannic oxide and alkali metal ferrocyanide from the sludge formed in a halogen tin electrodeposition bath is described. The process comprises dissolving the ferrocyanide compounds and the tetravalent tin compounds present in the sludge in an alkaline medium, removing any insoluble materials, precipitating hydrated stannic oxide from the solution by neutralization of the solution, and separating the hydrated stannic oxide from the solution which then contains ferrocyanide ion together with acid and base counterions.

REFERENCES:
patent: 1252742 (1918-01-01), Tillinghast
patent: 1670307 (1928-05-01), Little
patent: 1902735 (1933-03-01), Tamaru et al.
patent: 2366915 (1945-01-01), Lento, Jr. et al.
patent: 2436974 (1948-03-01), Richter
patent: 3346468 (1967-10-01), Jongkind
patent: 3907653 (1975-09-01), Horn
Cotton and Wilkinson, Advanced Inorganic Chemistry, A Comprehensive Text, Interscience Publishers, 1962, pp. 355,356,364.

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