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Little has appeared in the literature on anion exchange reactions for metal recovery, although organic cation exchangers are being used for this purpose. The present investigation was undertaken to study anion exchange for recovery of metals which form complex anions. Satisfactory adsorption and recovery have been demonstrated with chromium, gold, iron, molybdenum, palladium, platinum,and vanadium, using differently pes of complex anions. A more extensive study was made of chromium recovery. The anion exchange mechanism of the adsorption was demonstrated. Adsorption on different anion exchanger salts and from several influents warcarried out. Best results were obtained with adsorption from a neutral chromate sokition on the anion exchanger chloride. Recovery experiments were run with several salts, bases, mixtures of the two, and with an acid. Alkaline regenerants were found best. Acid regenerants caused oxidation of the anion exchange resin and reduction of the chromate. Precious metals ere recoverable by ashing the resin. Metal concentrations of more than twenty-five times the Influent concentration were obtainable without recycling ... A typical automatic ion exchange unit Is reproduced at the right; this equipment may be used for processes ranging from the softening of water to the recovery of metal.

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