一种弱碱性树脂对淋洗液中铼的静态吸附性能

Static Adsorption Properties of a Kind of Weak Anion Ion Resin for Rhenium in Spraying Water

铼是一种稀有高熔点金属,多伴生在钼精矿中,经氧化焙烧后,大部分铼富集在烟气淋洗液中。为了实现钼精矿焙烧淋洗液中铼的回收,研究了不同型号离子交换树脂对铼吸附性能的对比,弱碱性阴离子交换树脂ZS70吸附铼的控速步骤、饱和吸附容量以及循环使用性能,并研究了不同吸附温度、铼离子浓度、硫酸根浓度等条件下,ZS70树脂对铼的平衡吸附容量和分配比。结果表明,弱碱性阴离子交换树脂ZS70对铼有较好的吸附性能,在相同试验条件下,其对铼的吸附容量大于强碱性阴离子交换树脂201×7和D201;ZS70树脂对铼的吸附过程受内扩散控制;树脂对铼的饱和吸附容量为60.4 mg·g^(-1);平衡吸附容量随吸附温度升高而降低,随初始浓度的升高而增加;分配比随吸附温度和初始浓度的升高而降低;硫酸根含量对树脂的平衡吸附容量影响不大;经过10次循环使用,树脂的平衡吸附容量仅降低2.84%,循环使用性能良好。

Rhenium,a kind of rare metal with high melting point,was usually associated in the molybdenum concentrate. In the oxidizing roasting process,most of rhenium enriched in the spraying water. For the recovery of rhenium solving in the spraying water,the adsorption performance for rhenium among the five kind of resins were compared. The static adsorption properties,including the control step of adsorption,the static saturated adsorption capacity and the cycle using,were studied by ZS70 resin. Additionally,the equilibrium adsorption capacity and distribution ratio were studied by different adsorption temperature,rhenium concentration and SO2-4concentration. Results showed that the adsorption performance of ZS70 resin,a kind of weak base anion exchange resin,was better than the others. Under the same experimental condition the adsorption amount of rhenium for ZS70 resin was higher than that of strong basic anion exchange resin that for 201 × 7 resin and D201 resin. The adsorption velocity of rhenium was controlled by intraparticle diffusion process,and the static saturated adsorption capacity was 60. 4 mg·g-1. The equilibrium adsorption capacity of rhenium rose with the decrease of temperature and increase of rhenium concentration. The distribution ratio of rhenium rose with the decrease of temperature and rhenium concentration. The influence of SO42- concentration on equilibrium adsorption capacity of rhenium was small. The equilibrium adsorption capacity of ZS70 resin decreased 2. 84% after recycling 10 times,which meant that the recycling performance of ZS70 resin was excellent.