Stripping and recovery of dichromate in electrolytic chlorate sy

Details Stripping and recovery of dichromate in electrolytic chlorate sy Stripping and recovery of dichromate in electrolytic chlorate sy

1988-01-12

1989-02-14

Stoll, Robert L.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423 56, 204 51, 204DIG13, 204 97, 210720, 210913, C01G 3700

Patent

active

048045284

ABSTRACT:
A process for removing dichromates from chlorate-rich solutions containing hypochlorite and dichromate ions and produced by the electrolysis of brine. The dichromate is reduced in a two-stage process by the addition of ammonia under controlled conditions of pH and temperature to a mixed di- and trivalent chromium hydroxide which is precipitated from solution and removed. The process provides an economical method of recovering chromium from electrolytically produced chlorate solutions.

REFERENCES:
patent: 3843769 (1974-11-01), Partridge et al.
patent: 4259297 (1981-03-01), Kaczur et al.
patent: 4477318 (1984-10-01), Tomaszewski
patent: 4560546 (1985-12-01), Perrone et al.
patent: 4680126 (1987-07-01), Frankard et al.

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