THE PRESENCE AND DETERMINATION OF MOLYBDENUM AND RARE EARTHS IN PHOSPHATE ROCK

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Abstract
Tennessee and Island-phosphate rocks are rather low in Mo. Phosphate rocks from Florida and N. Africa are considerably higher in Mo, generally containing more than 20 ppm. Some western rocks are very high in Mo. Superphosphate retains the Mo originally in the phosphate rock. Rare earths are present in quantities ranging from 110 to 1550 ppm. of R2O3 in the samples examined. A method for the combined detn. of Mo and rare earths in phosphate rock is descr. 5 g. of finely ground phosphate rock were fused with 15 g. of Na2CO3. Si was removed from the aqueous leachate by evaporating, taking up the residue with HCl and filtering. The soln. was extracted with isopropyl ether. Mo was detd. by the thicyanate colorimetric method. The rare earths were detd. in the leached residue after the extraction of Mo.

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