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Sorption of Tungsten from Alkaline Solutions.
U S Pat 4 241 028 1980 Dec; :
Tungsten is adsorbed from alkaline solutions such as brines by an ion-exchange 8-hydroxyquinoline-resorcinol-formaldehyde resin in bead form. The beads have a diameter of 300-850 micrometers and are more porous and have a higher ion exchange capacity than resin powders. Thus, a polymer was prepared from 0.5-1.5 Mole resorcinol and 3-5 mole hcho per mole of 8-hydroxyquinoline. A portion of the polymer beads was placed in a column 1 in diam by 36 in high. A carbonated brine containing 0.07 Wo3 g/l was passed down through the column (160 bed volumes) at ph 7.5. After elution with distilled water, 77 pct of the wo3 was recovered. Chem. Abstr. 94:143,155F (see also chem. Abstr. 92:80,039G) tungsten is recovered from alkaline solutions such as brines by sorption on 8- hydroxyquinoline-resorcinol-formaldehyde ion-exchange resins. Thus, a mixture of 26 g of 8-hydroxyquinoline, 134 ml of 2n naoh, and 59 ml of 37-pct aqueous hcho was stirred for 1 h at 40 deg c. The red solution was cooled to 30 deg c and a solution of 19.5 G of resorcinol in 113 ml of 2n naoh was added, followed by 58 ml of 37- pct hcho. The temperature was held at 47 deg c for 1 h, and the 400 ml of warm solution was added rapidly to 600 ml of chlorobenzene at 90 deg c containing 6.7 G of dispersant/l. Polymerization was completed in 24 h at 86 deg c. The resin beads were filtered, washed, and screened to 85 pct 20-48 mesh. The resin beads are effective for sorption of tungsten from alkaline brines containing 50-70 ppm w, with a ph 7-8.
U.S. Pat. 4,241,028; Dec. 23, 1980; Chem. Abstr. 92:80,039G
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