Sulfate removal from alkali metal chlorate solutions and product

Details Sulfate removal from alkali metal chlorate solutions and product Sulfate removal from alkali metal chlorate solutions and product

1991-03-07

1993-01-05

Niebling, John

Chemistry: electrical and wave energy

Processes and products

204 93, C25B 114, C25B 100

Patent

active

051768011

ABSTRACT:
A process for the removal of substantially chromium free sulfate from aqueous alkali metal solutions containing chromate and sulfate which includes mixing the solutions while having a pH of between about 2.5 and 4.5 with a calcium-containing material for a time and at a temperature sufficient to form a gypsum precipitate and separating that precipitate from the solutions; as well as a process for the production of alkali metal chlorate by electrolysis of alkali metal chloride including the removal of chromium free sulfate.

REFERENCES:
patent: 3970528 (1976-07-01), Zirniebl et al.
patent: 4636376 (1987-01-01), Maloney et al.
patent: 4702805 (1907-10-01), Burkell et al.
patent: 4747917 (1988-05-01), Reynolds et al.

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