辉钼矿电氧化浸出液中Mo(Ⅵ)和Re(Ⅶ)的萃取

Extraction of Molybdenum and Rhenium from Electro-oxidation Lixivium of Molybdenite

电氧化浸出辉钼矿技术具有浸出过程条件温和、金属回收率高、环境友好等特点,是一种很有应用前景的辉钼矿湿法分解新工艺,其中Mo(Ⅵ)和Re(Ⅶ)的萃取分离是该工艺的关键.文中以30%N235+20%仲辛醇+50%煤油为萃取剂,在萃取温度为室温、酸度为59 g/L HCl、相比(W/O)为1∶2时,Mo(Ⅵ)、Re(Ⅶ)单级萃取率分别达到99.95%和95.76%;以17%的氨水为反萃剂,在相比为2∶1、反萃温度为室温时,Mo(Ⅵ)、Re(Ⅶ)的反萃率分别达到99.49%和98.35%.

The electro-oxidation is an environment-friendly hydrometallurgy technique of extraction from molybde-nite concentrate,with moderate reacting conditions and high metal recovery.In this paper,aiming at the key step of the technique,namely the separation of Mo（Ⅵ） and Re（Ⅶ）,some experiments were performed.The results show that,when the mixture of 30% N235＋20% sec-caprylic alcohol＋50% kerosene oil is used as the extractant for the extraction with a W/O ratio of 1∶2 and an acidity of 59g/L HCl at room temperature,the single-stage extraction rates of Mo（Ⅵ） and Re（Ⅶ） respectively reach 99.95% and 95.76%;and that,when 17% ammonia is used as the stripping agent for the stripping with a W/O ratio of 2∶1 at room temperature,the stripping rates respectively reach 99.49% and 98.35%.