Method for removing impurities from an alkali metal chlorate pro

Details Method for removing impurities from an alkali metal chlorate pro Method for removing impurities from an alkali metal chlorate pro

1993-05-06

1994-10-18

Fuller, Benjamin R.

Chemistry of inorganic compounds

Halogen or compound thereof

Ternary compound

423165, 423 92, 210687, C01B 1114

Patent

active

053566106

ABSTRACT:
The invention relates to a method for removing calcium ions and silicon compounds from various liquors produced or obtained in an alkali metal chlorate process, thereby reducing the operating cost and improving the possibility to close the process further. The calcium ions and silicon compounds are removed by addition of carbonate ions for precipitating calcium carbonate and by addition of an iron-containing compound for forming and precipitating a complex of iron ions and a silicon compound, whereupon the precipitates are co-separated from the liquor. The removal of calcium and silicate ions is substantially facilitated by the simultaneous separation of the precipitates. Subsequently, the excess of carbonate ions can be reduced by acidifying the electrolyte for releasing carbon dioxide.

REFERENCES:
patent: 4155820 (1979-05-01), Ogawa et al.
patent: 4946565 (1990-08-01), Hakansson
patent: 5176801 (1993-01-01), Szanto et al.

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