Study On The Process Of Recovering Rhenium From Calcination Fume Of Molybdenum Concentrate

Based on literature review of the existing rhenium recovery methods home and abroad,this paper mainly deals with the process of recovering rhenium from calcinations fume ofmolybdenum concentrate. The processes of leach, resin adsorption, desorption andcrystallization were applied in the rhenium's extraction on the basis of exploratory research. Inthe water-leaching experiments, the factors relating to the leaching process such as temperature,leaching time and ratio of liquid to solid were tested, a preferable leaching process was obtained:the temperature was 333 K; leach time was 2 hours and the ratio of liquid to solid was 4:1. Thetotal leaching rate reached 96.4 percent. On the basis of the systematical analysis of leachliquor's components and rhenium's existence state, the resin 201× 7 which is a kind of strongbasic anion-exchange resin was used in the experiments to absorb rhenium, and the effects ofsolution acidity, concentration, time etc were studied, the preferable results were obtained: 9%NH4Cl+5%NH4OH and 1mol/L HNO3 were used as the strippant of rhenium and molybdenumrespectively under the room temperature; the volume ratio of strippant to resin is 20:1 and thedesorptive time is two hours. The desorptive rate of molybdenum and rhenium is above 96 %and 97% respectively. After the evaporation, concentration and crystallization of the desorptivesolution, the crystals NH4ReO4 was extracted, and its purity reached 99.5 %, This research weresignificant not only to the reducing of environmental pollution but also to the improvement ofrhenium resource utilization and economic enterprise.