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The main purpose of this article is to impregnate acid
extractants Cyanex-271 and Cyanex-302 into macroporous resin
XAD-2 for the extraction of Zn(II) ion from sulfate solution.
Dichloromethane was ussed as diluent, and 2-butoxyethanol as
modifier, to prepare Extractant-impregnated resin(EIR).The
result found that the distribution ratio increased with
increasing the amounts of extractants,modifier,pH value and
temperature,but decreased with increasing the initial
concentration of metal ions. Thecolume operation experiment
fount a breakthrough point under low flowrate operation. In the
desorptive experiment, high nitric concentration would
accelerate the desorption of metal ions out of the colume.The
theoretical analysis used the slope analysis method and
LETAGROP-DISTR program,and found two complex products for
Cyanex-272,threecomplex products for Cyanex-302. The ratio of
products would be variedwith the extractant concentration,pH
value and temperature.The reactionswere found to be endothermic.
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