Method for separating impurities from an aqueous alkali metal ch

Details Method for separating impurities from an aqueous alkali metal ch Method for separating impurities from an aqueous alkali metal ch

1993-05-06

1994-09-27

Langel, Wayne

Chemistry: electrical and wave energy

Processes and products

423163, 423166, 423555, C25B 124, C01F 1146

Patent

active

053504950

ABSTRACT:
The invention relates to a method for separating sulphate from an aqueous electrolyte in an alkali metal chlorate process, thereby reducing the operating cost and increasing the possibility of further closing the electrolytical production of alkali metal chlorate. Calcium ions are added to a portion of the electrolyte, for precipitating calcium sulphate. By adjusting the pH within the range of from 4.6 up to about 7, and combining the temperature, content of ions and the molar ratio between sulphate and calcium ions added in a suitable manner, the calcium sulphate will precipitate predominantly as gypsum and essentially without inclusions and/or co-precipitation of chromium-containing compounds or chlorate. The precipitate is subsequently removed from the portion of electrolyte, whereafter the thus purified portion of electrolyte is recycled to the chlorate process. Any fluoride ions in the electrolyte can also be removed by the addition of calcium ions and a subsequent co-separation of the calcium fluoride precipitated with the calcium sulphate.

REFERENCES:
patent: 3970528 (1976-07-01), Zirngiebl et al.
patent: 4259297 (1981-03-01), Kaczur et al.
patent: 4636376 (1987-01-01), Maloney et al.
patent: 4699701 (1987-10-01), Lipsztajn
patent: 4702805 (1987-10-01), Burkell et al.
patent: 4976936 (1990-12-01), Rathl et al.
patent: 5108722 (1992-04-01), Ruthel et al.
patent: 5176801 (1993-01-01), Szanto et al.
patent: 5215632 (1993-06-01), Fritts et al.

Affiliated with

Also associated with

Rating

Method for separating impurities from an aqueous alkali metal ch does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for separating impurities from an aqueous alkali metal ch, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for separating impurities from an aqueous alkali metal ch will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1263820