改性树脂CB-ACT富集离子型稀土矿浸出液实验研究

Enrichment of Ionic Rare Earth's Leaching Solution by modified resin CB-ACT

在Φ15 mm×130 mm吸附柱中,利用改性树脂CB-ACT对离子型稀土矿浸出液中RE^(3+)和Al^(3+)进行动态吸附实验研究,考察料液初始浓度、料液流速、吸附温度等因素对改性树脂CB-ACT吸附RE^(3+)和Al^(3+)的动态吸附曲线的影响.结果表明:动态吸附的最佳条件为料液初始浓度4 g/L、料液流速4 m L/min、吸附温度308 K,在该工艺条件下,改性树脂CB-ACT对RE^(3+)和Al^(3+)吸附效果较好.其次,使用0.8 mol/L的M(OH)n溶液对饱和吸附树脂进行淋洗,可选择性的将树脂上吸附的Al^(3+)洗脱下来,与RE^(3+)分离.在较好的淋洗工艺条件下,解吸液中Al_2O_3/REO的比值可低至0.34%,稀土中的铝已基本去除.

The modified resin CB-ACT was synthesized and used to adsorb RE3＋ and Al3＋ from the leaching solution in the 015 mmxl30 mm adsorption column. The factors, including the initial solute concentration, the liquid flow rate, and the adsorption temperature were examined to develop a process for adsorbing RE3＋ and Al3＋ from the leaching solution in the dynamic adsorption experiment. The results show that the optimal conditions for the dynamic adsorption are initial solute concentration of 4 g/ L, liquid flow rate of 4 mL/min, adsorption temperature of 308 K. Secondly, in order to selectively separate Al3＋ from the resin which adsorbed RE3＋ and Al3＋, the 0.8 mol/L M（0H）re solution is used to elute the saturated adsorption resin. Under the optimum elution conditions, the ratio of AI2O3/REO in desorption solution can be as low as 0.34 %, and the aluminum has been basically removed completely.