C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/310, 53/379
C22B 7/00 (2006.01) B01J 3/04 (2006.01) C01G 1/12 (2006.01) C01G 53/11 (2006.01) C22B 3/44 (2006.01)
Patent
CA 1214335
ABSTRACT OF THE DISCLOSURE A process is provided for continuously precipi- tating precipitate-forming ions under elevated temperature and pressure from a solution thereof using recycle precipi- tate seed as a precipitation aid. The process comprises establishing a solution of the precipitation-forming ions, feeding the solution at an elevated temperature and pressure through an autoclave having a series of precipi- tation compartments, and adding a precipitation agent to the solution while it is maintained under elevated tempera- ture and pressure to precipitate the precipitation-forming ions and thus form a precipitate slurry. The slurry is caused to flow out of the autoclave by virtue of the prevailing pressure in the system to a solids-liquid separator which is serially connected in pressure communi- cation with the autoclave, the separator having a dense slurry fluidized leg or an elutriation column and being disposed at an elevation relative to the autoclave to pro- vide a hydrostatic head of the withdrawn slurry in gravity- flow relationship to the autoclave. The precipitate may be continuously elutriated in the column under the pre- vailing pressure so as to provide an upper slurry portion of precipitate fines and a lower portion of product con- centrate. The precipitate fines are then caused to flow by gravity as seed material to the autoclave without requiring the use of pumps for circulating the slurry.
430187
Compagnie Francaise D"entreprises Minieres Metallurgiques Et D'investissements
Hewitt Neville S.
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