改性D201树脂从钼精矿氧压浸出液中分离回收铼(Ⅶ)的研究

Study on the Separation and Recovery of Re(Ⅶ)from Molybdenum Concentrate Oxygen-pressure Leaching Solution by D201 Resin

为开发一种低成本、环保型离子交换工艺回收铼,基于钼铼离子在酸性体系中离子形态的差异,采用改性D201阴离子交换树脂从钼精矿氧压浸出液中分离回收铼(Ⅶ)。考察了初始pH值、转速、树脂用量、吸附温度、吸附时间对铼回收效果的影响,并利用Raman、FTIR和SEM-EDS对浸出液和改性树脂进行表征分析。结果表明:在初始pH=1.70、转速300 r/min、吸附温度20℃、吸附时间60 min、树脂用量0.002 g/mL的条件下,铼的吸附率达98.81%,而钼、铁、铈的吸附率分别仅为0.44%、1.04%、1.25%。铼与钼、铁、铈的最大分离系数分别为262.25、104.60、89.02。实际氧压浸出液中钼、铁、铈主要以MoO_(2)^(2+)、Fe^(3+)和Ce^(3+)等阳离子形态存在,铼以ReO_(4)^(-)阴离子形态存在,改性D201阴离子交换树脂通过静电吸引和螯合作用选择性吸附铼离子,实现铼与钼、铁、铈的有效分离。

In order to develop a low-cost and environmentally friendly ion exchange process to recover rhenium,a modified D201 anion exchange resin was used to separate and recover rhenium(Ⅶ)from the oxygen-pressure leaching solution of molybdenum concentrate based on the difference in ionic forms of molybdenum-rhenium ions in acidic systems.The effects of initial pH,rotating speed,resin relative dosage,adsorption temperature and adsorption time on the recovery of rhenium were investigated,and the leachate and modified resin were characterized and analyzed by Raman,FTIR and SEM.The results showed that under the conditions of initial pH=1.70,speed 300 r/min,adsorption temperature of 20℃,adsorption time of 60 min and resin dosage of 0.002 g/mL,the adsorption rate of rhenium reached 98.81%,while the adsorption rates of molybdenum,iron and cerium were only 0.44%,1.04%and 1.25%,respectively.The maximum separation coefficients of rhenium from molybdenum,iron and cerium were 262.25,104.60 and 89.02,respectively.In the actual oxygen pressure leaching solution,molybdenum,iron and cerium mainly exist in the form of cations such as MoO_(2)^(2+),Fe^(3+)and Ce^(3+),and rhenium exists in the form of ReO_(4)^(-)anion.The modified D201 anion exchange resin selectively adsorbs on rhenium ions through electrostatic attraction and chelation to achieve effective separation of rhenium from molybdenum,iron and cerium.