C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 3/38 (2006.01) C01G 39/00 (2006.01) C22B 34/34 (2006.01)
Patent
CA 2154133
The invention relates to a process for the recovery of the molybdenum present in impure calcium molybdate result- ing from the treatment of uraniferous ores. According to this process (in 40) the calcium molyb- date is dissolved in an aqueous solution containing at least 2 moles/? of H2SO4 and then the molybdenum is ex- tracted (in 21) in an organic solvent comprising a dialkyl phosphoric acid such as di-(2-ethylhexyl)-phosphoric acid. After extraction, it is possible to wash the solvent (in 23) using an aqueous sulphuric acid solution and then recover the molybdenum extracted in the reextraction solvent in an ammoniacal solution. The choice of a dissolving solution having a H2SO4 concentration of at least 2 mole/? avoids the formation of difficultly extractable heteropolymolybdic components.
Baron Pascal
Brassier Cecile
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