Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group vib metal
Patent
1987-04-30
1989-11-21
Stoll, Robert L.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group vib metal
75101BE, 4236585, 210685, 210688, C01G 4100
Patent
active
048821314
ABSTRACT:
A tungsten extraction process wherein tungsten values are extracted from an aqueous alkali metal tungstate solution by an organic solution containing an amine extractant wherein the organic solution consists essentially of from about 6% to about 10% by volume of said amine extractant, and the balance of said organic solution being an aromatic solvent consisting essentially of a mixture of alkyl benzenes wherein the alkyl benzenes have molecular weights of 120, 134, or 148 and the total number of carbon atoms in the alkyl chains attached to the benzene ring are either 3, 4, or 5, and thereafter the tungstate values are removed from the organic solution by stripping with aqueous ammonia, is improved by carrying out the stripping step in the aqueous continuous mode, and having as the stripping agent, an aqueous solution of ammonium metatungstate having a tungsten concentration which allows the strip solution to have a specific gravity of no greater than about 1.5, the stripping agent having sufficient ammonia to maintain the pH of the stripping agent at from about 5 to about 8, with the temperature of the stripping agent being no greater than room temperature.
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Christini James N.
Patton James C.
Powers John A.
Castle Donald R.
GTE Products Corporation
Harvey Paige C.
Quatrini L. Rita
Stoll Robert L.
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