Process for treatment of pyrochlore concentrates

Details Process for treatment of pyrochlore concentrates Process for treatment of pyrochlore concentrates

1973-12-07

1976-03-30

Lechert, Jr., Stephen J.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Radioactive metal

423 21, 423 22, 423 65, 423 68, 423 82, 423166, 423252, 2523011R, B01D 1100

Patent

active

039475425

ABSTRACT:
A continuous process for extraction of niobium, rare earths and thorium from niobium ore concentrates which includes digesting the ore with a hot solution containing 13 to 16 moles of sulphuric acid per liter, diluting the solution to a concentration of 10 to 13 moles of sulphuric acid per liter, separating the insolubles from the solution which includes alkaline earth sulphates and the sulphates of thorium and rare earths that are present, reducing titanium in solution to the trivalent state and diluting the solution to a concentration of 5 to 7 moles of sulphuric acid per liter, separating the precipitated niobium oxide and sulphates of thorium and rare earths, and then concentrating the resulting solution to the level desired for recycle to the digestion stage.

REFERENCES:
patent: 2885259 (1959-05-01), McCullough
patent: 2932555 (1960-04-01), Flynn

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