Selective recovery of heavy metals using xanthates

Details Selective recovery of heavy metals using xanthates Selective recovery of heavy metals using xanthates

1992-06-11

1994-06-14

Lithgow, Thomas M.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210710, 210722, 210724, 210725, 210727, 210728, 210730, 210731, 210912, 210913, 210914, 423 43, 423 26, 423 36, 423 37, 423101, 423140, C02F 154, C02F 156, C02F 162, C02F 164

Patent

active

053207599

ABSTRACT:
A process for selectively recovering dissolved heavy metals from a solution is disclosed that involves selectively reacting a xanthate with such dissolved heavy metals. Selective reaction of a xanthate with selected dissolved heavy metals is accomplished by conducting the reaction under conditions such that only some of the heavy metals react with the xanthate, to the exclusion of reaction with other dissolved heavy metals. Selectivity of the reaction is particularly influenced by the pH at which the reaction occurs. Typically, the reaction should occur at a pH below about 4.0. Xanthates, once reacted, can be separated from the heavy metal xanthate reaction product and recycled for use within the process. Purified heavy metal product can be produced if desired.

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Takahashi et al., "A Study on Removal of Cadmium Ion from Mine Water by Flotation Method Utilizing Xanthate as Selective Precipitant," Technology Reports, Tohoku Univ., vol. 36, No. 2, pp. 203-212 (Japan 1971).
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