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通过静态吸附和动态吸附实验,研究温度、pH值、稀释倍数和流速对001×8树脂从离子型稀土浸出液中吸附稀土与杂质离子的吸附量及分离系数的影响.结果表明:浸出液中稀土与杂质离子的吸附量及分离系数随着pH值的增大呈现出先增大而后减小的趋势,在pH值为3.5时达到最大值;随着温度的升高而增大,吸附量在313 K后逐渐趋于平衡.树脂对各离子吸附能力大小为:RE~(3+)>Al~(3+)>Mg~(2+)>SiO_3~(2-).RE~(3+)、SiO_3~(2-)和Al~(3+)的吸附量随着稀释倍数的加大而增大,随着流速的加快而减小,而Mg~(2+)的吸附量随着稀释倍数的加大或流速的加快而减小.因此,增大稀释倍数和降低流速有利于001×8树脂吸附稀土和除去杂质.
The effects of temperature, pH value, dilution factor and flow rate on adsorption capacity and separation coefficient of adsorbed rare earth ions and impurity ions from ionic rare earth leaching solution 001 × 8 resin were studied by means of static adsorption and dynamic adsorption experiments. The results showed that: The adsorption capacity and separation coefficient of impurity ions increase first and then decrease with the increase of pH value, reaching the maximum value at pH 3.5 and increasing with increasing temperature. The adsorption capacity is 313 K (3) Mg (2 +)> SiO 3 2- (2 -). RE ~ (3+), The adsorption amount of SiO 3 2- and Al 3+ increased with the increase of dilution ratio, decreased with the increase of flow rate, and the adsorption capacity of Mg 2+ increased with the increase of dilution ratio Increase or decrease the velocity of flow rate, therefore, increasing the dilution factor and decreasing the flow rate will help 001 × 8 resin adsorb rare earth and remove impurities.