METALLIC ION REMOVAL FROM PHOSPHORIC ACID

Metal ion impurities are removed from phosphoric acid by adding to the acid a precipitant comprising ions Or calcium and fluorine to cause precipitation Or, for example, a magnesium-containing precipitate. A preferred precipitant is one containing calcium fluoride, such as the sludge obtained by tre...

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Bibliographische Detailangaben
Hauptverfasser:	MILLS, HAROLD E
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY COMPOUNDS THEREOF FERTILISERS FODDER FOODS OR FOODSTUFFS HUMAN NECESSITIES INORGANIC CHEMISTRY MANUFACTURE THEREOF METALLURGY NON-METALLIC ELEMENTS PHOSPHATIC FERTILISERS THEIR TREATMENT, NOT COVERED BY OTHER CLASSES
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Beschreibung
Zusammenfassung:	Metal ion impurities are removed from phosphoric acid by adding to the acid a precipitant comprising ions Or calcium and fluorine to cause precipitation Or, for example, a magnesium-containing precipitate. A preferred precipitant is one containing calcium fluoride, such as the sludge obtained by treating pond water from a phosphoric acid plant with a calcium-containing compound. Preferably, the soluble sulphate content of the phosphoric acid is maintained at at least about 2 by weight. An animal feed can be prepared from the precipitate by combining the precipitate with phosphate rock, water, and a sodium-containing compound, and then calcining the combination.