Abstract:
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
22+, 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.