This study explored a highly selective and efficient oxidation system for the recovery of rhenium resources from Re-rich arsenic sulfide slag containing significant quantities of arsenic. The effects of H 2 O 2 dosage, initial H 2 SO 4 concentration and leaching temperature on the Re, As and Bi extraction efficiency were investigated in detail. The results demonstrated that under the most favorable conditions of 20 mL H 2 O 2 , 70°C, 0.25 mol L −1 H 2 SO 4 solution, the Re extraction efficiency can reach 99.2%. The phase transitions of the main constituents of the slag, Re, As and Bi were analyzed. ReS 2 and Re 2 S 7 in the Re-rich arsenic sulfide slag were transformed to ReO 4 − , impelling Re to enter the leachate. Bi and As were oxidized and entered the leachate in ionic form under a limited H 2 O 2 dosage. As the H 2 O 2 dosage increased, the concentration of Bi and As in the leachate reached a threshold value and transformed to stable BiAsO 4 , resulting in the attenuation of As and Bi extraction efficiency. This process considerably promoted the selective leaching of Re and the separation of Re from As and Bi. Kinetic analysis shows that the leaching process is controlled by chemical reaction with an apparent activation energy of 29.05 kJ mol −1 .
Polyelectrolyte-enhanced ultrafiltration was investigated for rhenium(VII) recovery from aqueous solutions by using polyquaternium-6 (PQ6) as a complexing agent. The effects of the operating parameters on the permeate flux ( J ) and the rhenium rejection coefficient ( R ) were studied. In the process of concentration, J declines slowly and R is about 1. The concentrated solution was used for the decomplexation. It takes 10 min to achieve the decomplexation equilibrium at a chloride ion concentration of 100 mg L –1 . The decomplexation percentage reaches 45.6 %. In the diafiltration process, rhenium is extracted effectively, and the purification of the regenerated PQ6 is satisfactory. The regenerated PQ6 was used to bind rhenium(VII). The binding capacity of the regenerated PQ6 is close to that of fresh PQ6.
Given the scarcity of rhenium resources, recovering rhenium from waste materials represents a strategically viable solution. This review focuses on three novel aspects in the field of rhenium recovery. It integrates pyrometallurgical (KOH-K₂CO₃ molten salt), hydrometallurgical (solvent extraction/ion exchange), and electrochemical (NaOH electrolysis) methods into a unified ‘temperature-medium-electrochemical potential’ framework, proposing oxidative volatilisation with three-zone tube furnace fractionation for W-Mo-Re alloys. The study evaluates AI sorting, task-specific ionic liquids, and microwave-synthesised nano-resins, demonstrating their capacity to boost recovery rates from 40% to 92% for low-grade rhenium (<2 ppm). Additionally, it quantifies carbon footprint reductions through secondary resource recovery, establishing a circularity-clean energy correlation model that redefines strategic metal management. Case studies on Pt-Re catalyst regeneration and aerospace alloy recycling validate co-extraction solutions for multicomponent systems.
危险品化学品经营许可证（带存储）