Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group iiia metal or beryllium
Patent
1986-12-16
1988-03-08
Stoll, Robert L.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group iiia metal or beryllium
423127, 423131, 423331, 423332, 423624, C01F 302
Patent
active
047298812
ABSTRACT:
Beryllium is efficiently recovered from silicate ores in a hydrometallurgical, single solvent, process which avoids the complexities, high costs and hazards ofpyrolytic, fluorination and acid leach methods, by contacting the ore in a closed reactor at elevated temperature and autogenous pressure with a concentrated caustic 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.
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patent: 3615260 (1971-10-01), Hanson et al.
Everest, D. A., et al, "Economic Assessment of Four Processes for the Production of Beryllium Hydroxide from Flotation Concentrates", Trans. Inst. Min. Metall., 74(13), 1964.
Burkin, A. R., "Pressure Leaching of Some Silicate Minerals in Alkali Solutions," Proceedings, International Minerals Processing Conference, Warminster, England, 857-862 (1960).
Higbie et al, "Beryllium: A Continuous Extractive Process," Chem. Eng. Prog., 54, No. 4, 51-54 (1958).
Griffths, Joyce, "Beryllium Minerals--Demand Strong for Miniaturisation", Industrial Minerals, Jun. 1985, 41-51.
Beryllium Extraction Process at Brush Wellman Delta, Utah Plant (flowsheet p. 47 of Griffths' article).
Baker Patrick C.
FMC Corporation
Ianno Frank
Stoll Robert L.
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