Recovering Tungsten from Alkaline Brine.
U S Pat 3 826 808 1974 Jul; :
Alkaline solutions containing tungstate, e.g., natural brines or solutions prepared by alkaline digestion of w ores, are contacted with a solution of dihydroxyphenolic compounds, e.g., kerosine solutions of pyrocatechol. The tungstate is complexed and enters the organic phase. The organic phase is separated and stripped with aqueous naoh to recover the w. Also, an anion exchange resin can be used to extract the tungstate chelate.
U.S. Pat. 3,826,808; July 30, 1974; Chem. Abstr. 82:19,117H