C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 3/08 (2006.01) C01B 7/19 (2006.01) C01G 33/00 (2006.01) C01G 35/00 (2006.01) C22B 3/26 (2006.01) C22B 34/24 (2006.01) C22B 60/02 (2006.01)
Patent
CA 2139642
A process for recovering metal (17) and acid values (48) from a source material (22) containing metallic fluorides comprises digest- ing (10) the source material in sulfuric acid (20) to form a slurry, se- parating (12) a fluoride containing solid phase (39) and a metal con- taining first liquid phase (26). The solid phase is subjected to pyro- hydrolysis (14), sulfuric (40) and hydrofluoric acids (42) are rec- overed, and the first liquid phase is processed to recover the metal values by solvent extraction (16) or ion exchanges (18). The tantalum values are extracted from the first liquid aqueous phase by a water immiscible organic extractant such as methylisobutyl ketone to form a first liquid organic phase containing tantalum and a second liquid aqueous phase. The tantalum is stripped from the first organic phase using water (33). The process includes the additional steps of heating the separated solid phase from about ambient temperature to an ele- vated temperature in the presence of water vapor to evolve sulfuric acid (44) and render the gangue chemically inert (52). When the source material contains uranium the digestion step reduces the amount of gangue present in the radioactive source. The process can include the additional steps of removing uranium (34) from the sec- ond liquid aqueous phase by either an ion exchange resin or by sol- vent extraction using a water immiscible organic extractant to yield a uranium depleted aqueous phase (50) which can be treated with an aqueous solution of calcium oxide (66). Sulfuric acid and the organic extractant for extracting uranium can be recycled if desired (20).
Cabot Corporation
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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