Process for preparing pure barium nitrate crystals

Details Process for preparing pure barium nitrate crystals Process for preparing pure barium nitrate crystals

1974-06-07

1976-03-30

Stern, Edward

Chemistry of inorganic compounds

Nitrogen or compound thereof

Oxygen containing

423490, 23300, 23304, C01F 1136, C01F 1138, C01F 1144, C01F 1122

Patent

active

039475530

ABSTRACT:
A malleable or press-forgeable ingot of barium fluoride, for use as an optical body, may be grown from an ultra-pure precipitate of barium fluoride which contains less than 10 parts per million (ppm) of strontium or calcium. A process is disclosed for crystallizing barium nitrate crystals in the presence of nitric acid, reacting barium nitrate with ammonium carbonate to form barium carbonate, recovering barium carbonate crystals, suspending the barium carbonate crystals in water and precipitating barium fluoride with hydrofluoric acid. The barium fluoride crystals are recovered, dried and then calcined in the presence of ammonium fluoride or bifluoride. Barium fluoride (BaF.sub.2) crystals obtained by the process of this invention contain less than 10 ppm of each strontium and calcium.
Crystals of an alkaline earth metal fluoride which have been calcined in the presence of a fluoride of ammonium are unexpectedly densified, and are particularly suited for melt-growth of an ingot in a known manner. A maximum concentration of 10 ppm of strontium and calcium in a BaF.sub.2 ingot has been found to be the critical demarcation between a frangible prior art BaF.sub.2 ingot and an ingot of BaF.sub.2 which does not unpredictably shatter when cut, and, which may be reliably press-forged into an optical body.

REFERENCES:
patent: 1845224 (1932-02-01), Blanc
patent: 2010046 (1935-08-01), Wilson
patent: 3010788 (1961-11-01), Glueckauf
"Solubilities of Inorganic and Organic Compounds", by a Seidell, Vol. 1, pp. 117, 208, (1919 Ed.), and Vol. 2, p. 1081, (1928 Ed.), D. VanNostrand Co., N.Y.

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