Leaching process for niobium and (or) tantalum minerals

C - Chemistry – Metallurgy – 22 – B

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C22B 34/24 (2006.01) C01G 33/00 (2006.01) C01G 35/00 (2006.01)

Patent

CA 1144376

ABREGE DESCRIPTIF La divulgation décrit un procédé de lixiviation d'un minerai de niobium et/ou de tantale contenant du calcium comme impureté principale; le minerai est de préférence du pyrochlore. Pour ce faire, on traite directement et sans traitement préli- minaire le minerai par un mélange d'acide sulfurique et d'acide fluorhydrique, de préférence dilués, de façon à insolubiliser le calcium sous forme de sulfate de calcium et à solubiliser le niobium et/ou le tantale sous forme d'oxyfluorure et empêcher empêcher ainsi la formation de quantités appréciables de fluorure de calcium.

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