Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group iiia metal or beryllium
Patent
1978-04-10
1979-10-30
Hearn, Brian
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group iiia metal or beryllium
423132, 423139, 423626, 423484, 423126, C01G 4910, C01F 722
Patent
active
041728793
ABSTRACT:
A process for the selective separation of ferric iron from an aluminum fluoride aqueous solution containing ferric iron is effected by contacting said solution with an organic extractant phase consisting essentially of a mixture of a mono (higher alkyl-substituted phenyl) phosphoric acid and a di(higher alkyl-substituted phenyl) phosphoric acid dissolved in an inert diluent to thereby transfer the ferric iron to said organic extractant phase. The efficiency of the process is further improved by adjusting the aluminum fluoride aqueous feed solution to a temperature in the range of about 140.degree. F. to about 175.degree. F. prior to contacting it with the organic extractant phase, maintaining the temperature within this range throughout the ferric iron extraction stage or stages, then heating the resulting iron-depleted aqueous raffinate to a temperature higher than 195.degree. F., and then crystallizing aluminum fluoride trihydrate out of the raffinate at this higher temperature.
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Peppard et al., "Acid Esters of Orthophosphoric Acid as Selective Extractants for Metallic Cations-Tracer Studies", J. Inorg. and Nucl. Chem., vol. 7 (1958), pp. 269, 276-285.
Miller David J.
Wiewiorowski Tadeusz K.
Freeport Minerals Company
Hearn Brian
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