LIX84Iによるニッケルの溶媒抽出における正および逆抽出速度の改善

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As a continuation of our study on the recovery of nickel from spent electroless nickel plating baths by solvent extraction, an acceleration of the extraction and stripping by additive addition to the organic phase has been investigated for the 20 vol%LIX84I-Ni(II) system. The vigorous shaking-out test showed that the rates of the extraction from a weakly acidic solution and the stripping with 1 kmol m-3 sulfuric acid were markedly improved by adding a commercial acidic organophosphorous extractant such as D2EHPA, PC88A, and Cyanex272 in the orders: D2EHPA∼PC88A > Cyanex272 and D2EHPA > PC88A > Cyanex272, respectively. For example, 2 vol%D2EHPA increased the extraction and stripping rates, respectively, by 6.5 and over 30 times in comparison with no additive. This acceleration effect was enhanced by increasing the additive concentration in the range from 0 to 8 vol% although the enhancement becomes slight during stripping when the additive concentration was greater than 2 vol%. At equilibrium, the addition of D2EHPA reversed the selectivity of nickel over iron and zinc with little affecting the nickel distribution at pHs over 4.6. The durability test that repeats the extraction and stripping revealed that the nickel extraction ability of the organic phase containing 20 vol%LIX84I and the 2 vol% acidic organophosphorous extractant did not change during 10 repetitions. Possible roles of the acidic organophosphorous extractants as a phase-transfer catalyst and dispersant were suggested in order to explain the acceleration effect.
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LIX84Iによるニッケルの溶媒抽出における正および逆抽出速度の改善

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