Method of precipitating radium to yield high purity calcium sulf

Details Method of precipitating radium to yield high purity calcium sulf Method of precipitating radium to yield high purity calcium sulf

1973-04-12

1976-04-06

Padgett, Benjamin R.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Radioactive metal

423166, 423167, 423309, 423319, 423555, 423321R, C01f 1300, C01f 1146

Patent

active

039490475

ABSTRACT:
In the manufacture of phosphoric acid by treatment of phosphate ores with excess phosphoric acid and precipitation of calcium ions as calcium sulfate, the purity and quality of the byproduct calcium sulfate is substantially improved by subjecting the monocalcium phosphate extract of the ore before precipitation of calcium sulfate to one or more preliminary treatments, whereby contaminent ions are substantially and preferentially removed from the extract while the calcium remains substantially in solution. These preliminary treatments may include separation of fluoride by reaction with silicon compounds, separation of radium by reaction with barium compounds in the presence of sulfate ions, and separation of strontium as strontium sulfate.

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Korkisch (I), Modern Methods for the Separation of Rarer Metal Ions, pp. 98-99, Pergamon Press, (1969) Oxford.
Korkisch (II), ibid, pp. 306 and 309.
Sneed et al., Comprehensive Inorganic Chemistry, Vol. 1, pp. 106-107, D. Van Nostrand Company, Inc. (1953), Princeton, N.J.

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