C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
53/256, 23/278
C01F 3/02 (2006.01) C22B 3/12 (2006.01) C22B 26/20 (2006.01) C22B 35/00 (2006.01)
Patent
CA 1303360
Abstract: Beryllium is efficiently recovered from silicate ores in a hydrometallurgical, single solvent, process which avoids the complexities, high costs and hazards of pyrolytic, fluorination and acid leach methods, by contacting the ore in a closed reactor at elevated temperature and autogenous pressure with a concentrated caustics solution and lime or lime hydrate to form a slurry containing dissolved beryllium, reducing the pressure to about one atmosphere and the temperature to below the boiling point of the caustic solution, separating by-product solids to leave a pregnant leach liquor, diluting and digesting the leach liquor to precipitate the beryllium and to leave a caustic mother liquor, and separating the beryllium. The caustic mother liquor can be recycled to the ore contacting step in a closed loop version of the process. 1329W30130Wmd
552503
Fmc Corporation
Osler Hoskin & Harcourt Llp
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