Potassium uranyl vanadate

Carnotite is a potassium uranyl vanadate for which the formula K20 2U03 V206 8H20 is frequently given. The ore, however, varies materially from this composition. It contains 19 or 20 per cent V206 and is valuable for both vanadium and uranium, as well as radium. It occurs extensively in Paradox Valley, Colorado, and in Utah, South Australia, Portugal, etc. 

Camotite is a potassium uranyl vanadate, K2O.2UO3.V2O5.11H2O. Since the uranium is in the fully oxidized condition, leaching can usually be carried out without an oxidant, at a particle size of about 100 mesh. The vanadium dissolves on leaching, to sodium vanadate, and the uranium forms a soluble double carbonate. The reaction may be represented approximately as ... 

Uranyl-vanadates.—By adding uranic anhydride to fused potassium or sodium metavanadate, microscopic, rectangular, fluorescent plates of the compositions K(U02)V04 and Na(U02)V04 are obtained. These are probably derivatives of a relatively stable uranyl-... 

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