Method for purifying calcium nitrate melt/solution which is sepa

Details Method for purifying calcium nitrate melt/solution which is sepa Method for purifying calcium nitrate melt/solution which is sepa

1988-09-28

1990-08-28

Stoll, Robert L.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

71 58, 423167, 423395, C01F 1136

Patent

active

049523791

ABSTRACT:
The present invention relates to a method for purifying calcium nitrate melt or solution separated from the mixture obtained by dissolution of rock phosphate with nitric acid. The melt contains fluorine and phosphorus as main contaminants. The mol-ratio phosphorus/fluorine in the crude calcium nitrate melt/solution is adjusted to 3.5>P/f>0.3, possibly by extra addition of a phosphorus compound, and the mixture is then neutralized by ammonia to pH=5-6. The precipitate thereby formed is removed while the filtrate, which is a purified nitrate of lime melt, is evaporated and further processed. The purification can be carried out in two stages, with a P/F-ratio in the first stage of 0.3-3 and 1-3.5 in the second stage. Phosphoric acid or a phosphoric acid containing solution is used as phosphorus compound.

REFERENCES:
patent: 1856187 (1932-05-01), Johnson
patent: 1983024 (1934-12-01), Foss
patent: 2061191 (1936-11-01), Foss et al.
patent: 2114600 (1938-04-01), Larsson
patent: 4720377 (1988-01-01), Pennnington

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