高铁盐酸溶液的除铁试验

Iron Removal Experiments in Iron-Rich HCl Solution

采用酸法常压浸出——离子交换工艺回收赤泥中的镓,关键环节之一是浸出液的除铁。选择LSD396螯合树脂作为除铁试剂,考察树脂用量、温度及接触时间对酸性浸出液除铁效率的影响,并探索了饱和树脂的解吸试验。结果表明,最适宜除铁条件为:树脂用量0.6g/mL、温度45℃、接触时间120min,该条件下除铁率大于99%,且镓的损失仅为1.29%,表明LSD396树脂对强盐酸溶液中Fe3+选择性好、吸附性强。在温度45℃、5BV洗液量条件下,0.05mol/L稀盐酸溶液和去离子水对饱和树脂解吸效果相当,解吸率均大于92%,考虑成本和环保因素,选择去离子水作为洗液。

Iron removal is the primary process to recover gallium from Bayer red mud through acidicleaching-ion-exchange technology.LSD396 resin was employed to adsorb iron from acidic leaching solution.Effects of resin dosage,temperature,and duration on iron removal were investigated,and desorption behavior of loaded resin was explored.The results show that iron removal rate is 99% above with loss of Ga of 1.29% under the conditions of 45 ℃,resin dosage of 0.6 g/mL,and 120 min,which indicates that LSD396 resin exhibits an excellent selectivity for iron in strong HCl solution.Desorption efficiency is 92% above under the conditions of 45 ℃ and 5 BV either with 0.05 mol/L HCl solution or deionized water as eluant.Deionized water is selected as eluant due to its low cost and being environmental friendly.