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Extraction of Metals from Mixtures of Oxides or Silicates.

Authors
Davidson-CF
Source
U S Pat 4 307 066 1981 Dec; :
Link
NIOSHTIC No.
10006744
Abstract
Metals such as lithium are recovered from mixtures of oxides and silicates, such as clays, by selective chlorination with h2o-hcl vapors at high temperature. The optimum concentration of hcl in the mixture is 20-35 pct, and the preferred chlorination temperature is 500 deg-800 deg c; the resulting chlorides are leached with water at 20 deg-80 deg c. Thus, clay containing al 1.6, Si 19.5, Mg 7, ca 12.7, and li 0.5 pct was chlorinated at 700 deg c with a h2o vapor- 20 pct gaseous hcl mixture for 30 min. The product was leached with water at 80 deg c for 5 min, and the leach solution contained 80 pct of the li, with only 10 pct of the ca and 0.01 pct of the mg.
Publication Date
19811201
Document Type
PA;
Fiscal Year
1982
NTIS Accession No.
NTIS Price
Identifying No.
P 42-81
NIOSH Division
SLRC;
Source Name
U.S. Pat. 4,307,066, Dec. 22, 1981; Chem. Abstr. 94:87,874A
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