Molybdenum, Rhenium Extraction And Ion Exchange Separation

For the separation and enrichment of molybdenum(VI) and rhenium(VII) from direct electric-oxidation leaching liquid of molybdenite including high contents of copper and rhenium that from Dexing Copper Mine, extraction and ion exchange technologies were adopted, and the optimized experiment coditions were gained. A new method for separation and enrichment of molybdenum(VI) and rhenium(Ⅶ) from leaching liquid system was offered by this paper, so it has great significance.The Mo(Ⅵ), Re(Ⅶ) standard solutions and practical electric-oxidation leaching liquid of molybdnite were introduced to study all the factors that affect the extraction and anti-extraction of Mo(Ⅵ), Re(VII).Under the optimized conditions, the percentage extraction rates of Mo(Ⅵ),Re(Ⅶ) were 99.52%,95.37% and the anti-extraction efficiences were 99.79%,99.07% for the standard solutions; the percentage extraction rates of Mo(Ⅵ), Re(Ⅶ) were 99.77%,94.73% and the anti-extraction efficiences were 99.89%,99.54% for the practical leaching liquid. The experiment results showed that, for both standard solutions and practical leaching liquid, N235 and ammonia manifested good extraction and anti-extraction performance, respectively. The research on extraction mechanism indicated the active group of N235 is tertiaryamide.D201 resin was used to separate Mo(Ⅵ) and Re(Ⅶ) in anti-extraction liquid, the adsorption and desorption performances of the resin were surveyed, and the optimized conditions were received. Under the optimized conditions, the statistic experiments for the practical electric-oxidation leaching liquid of molybdnite showed that percentage adsorption rates of Mo(Ⅵ) and Re(Ⅶ) were 3.46%,92.18%, respectively, and the separation factor K was 169.56, the desorption efficiences of Mo(Ⅵ) and Re(Ⅶ) were 15.36%,98.97%, respectively. The experiment results showed that D201 resin had good adsorption selectivity for Re(Ⅶ), and it satisfied the sepatation demands of Mo(Ⅵ) and Re(VII).The research on resin adsorption mechanism indicated that the ion exchange process was controlled by liquid film diffusion step,and the isothermal adsorption data accorded with the Langmuir equation.