高铼酸铵除铊试验研究

从铜冶炼污酸中提取的高铼酸铵含有一定量的Tl元素, 影响高铼酸铵品质及制约铼产品的末端应用.文中采用传统的吸附法进行除Tl, 用活性炭、TiO₂、KI与XH30树脂进行静态吸附探索性试验; 在此基础上, 考察了铼液浓度、吸附线速度、铼液pH对XH30树脂动态吸附Tl的影响.结果表明, 活性炭与KI对Tl吸附效果不理想; TiO₂与XH30树脂长时间动态吸附Tl的吸附率分别达96.9 %、97.95 %; 用XH30树脂装柱吸附Tl, 当铼液Re为10 g/L, 铼液Tl约为5 mg/L, pH值为8.5时, 控制吸附线速度为8 cm/min, Tl去除率稳定在93.4 %, 铼液经重结晶后高铼酸铵品位稳定在99.99 %以上. 

Experimental study on thallium removal from ammonium perrhenate

Ammonium perrhenate extracted from copper smelting acid contains a certain amount of Tl element which affects the quality of ammonium perrhenate and limits the end application of rhenium products. In this paper, a traditional adsorption method was used to remove Tl: activated carbon, TiO₂, KI and XH30 resin were used to carry out static absorption tests. On this basis, the effects of rhenium solution concentration, adsorption linear velocity and rhenium solution pH on the dynamic adsorption of Tl by using XH30 resin were investigated. The results showed that the adsorption effect on Tl by using activated carbon and KI was not ideal, and the adsorption rates of Tl by using TiO₂ and XH30 resin for long-term dynamic adsorption were 96.9 % and 97.95 %, respectively. Tl was adsorbed with XH30 resin column. When Re] was 10 g/L, Tl], roughly 5 mg/L, pH, 8.5, and linear velocity of adsorption, controlled at 8 cm/min, the Tl removal rate could stand stable at 93.4 % and the grade of recrystallized ammonium perrhenate remained above 99.99 %.