Recovery of rhenium from aqueous mixed metal solutions by selective precipitation: A photochemical approach
Recovery of rhenium from aqueous mixed metal solutions by selective precipitation: A photochemical approach
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DOI：
10.1016/j.hydromet.2018.12.003
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发表时间：
2019-01-01
期刊：
影响因子：
4.7
通讯作者：
Asai, Takuma
中科院分区：
文献类型：
--
作者：
Hori, Hisao;Otsu, Takafumi;Asai, Takuma
研究了在异丙醇和丙酮存在下，利用紫外-可见光照射从含有共存金属（钼、钨或铝）的水溶液中选择性沉淀回收钼的方法。当铝-钼溶液（每种金属的初始浓度为10.4mM）的pH在6.3至12.5的范围内并且照射时间为6小时时，初始溶液中的铝被有效地回收到沉淀中（92-99%），并且铝的选择性高（铝的回收率是钼的9.2-21倍）。在不同的钼浓度下，对钼的选择性也很高（4.8-15.7 mM）和更高浓度下铼也被有效地和选择性地从铼-钨溶液中回收（每种金属的初始浓度为10.4 mM）：当pH值为7.0 ~ 12.0，辐照时间为6 h时，钨的回收率为90-95%，钨的回收率为钨的7.3 ~ 45倍。相反，当共存的金属是铝（初始铝和铝的浓度，分别为10.4 mM和8.6 mM; pH 11.2），95%的铝被回收沉淀后6小时的照射;然而，铝是有点不稳定的碱性溶液和铝的铝回收率是3.2倍。与钼和钨不同，铝倾向于与钼共沉淀。
Selective precipitation recovery of rhenium from aqueous solutions containing a coexisting metal (molybdenum, tungsten, or aluminum) by means of UV-visible light irradiation in the presence of 2-propanol and acetone was investigated. When the pH of the rhenium-molybdenum solutions (initial concentration 10.4 mM for each metal) was in the range from 6.3 to 12.5 and the irradiation time was 6 h, the rhenium in the initial solutions was efficiently recovered in the precipitates (92-99%), and the rhenium selectivity was high (the rhenium recovery ratio was 9.2-21 times that of molybdenum). The high selectivity for rhenium was also observed at different molybdenum concentrations (4.8-15.7 mM) and at a higher rhenium concentration (17.5 mM).Rhenium was also recovered efficiently and selectively from rhenium-tungsten solutions (initial concentration 10.4 mM for each metal): when the pH ranged from 7.0 to 12.0 and the irradiation time was 6 h, the rhenium recovery was 90-95% and the rhenium recovery ratio was 7.3-45 times that of tungsten. In contrast, when the coexisting metal was aluminum (initial rhenium and aluminum concentrations, 10.4 mM and 8.6 mM, respectively; pH 11.2), 95% of the rhenium was recovered in the precipitate after 6 h of irradiation; however, aluminum was somewhat unstable in the basic solution and the rhenium recovery ratio was 3.2 times that of aluminum. Unlike molybdenum and tungsten, aluminum tended to coprecipitate with rhenium.