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由于Al3+与F-结合在一起能够形成稳定的配位离子[Al F6]3-,所以本文采用HCl-AlCl_3体系所配成的混合溶液络合浸出包头50混合稀土精矿中的氟碳铈矿,通过热力学研究表明用HCl-AlCl_3体系所配成的混合溶液络合浸出包头50混合稀土精矿中氟碳铈矿的反应是可以自发进行的。同时得到了HCl-AlCl_3体系所配成的混合溶液络合浸出包头50混合稀土精矿的精矿浸出率和稀土浸出率;通过实验研究发现,改变各反应条件,在盐酸浓度达到6.0 mol·L-1,反应温度控制在95℃,氯化铝浓度为1.0 mol·L-1,搅拌速度为400 r·min-1,反应时间为120 min,液固比为20∶1的条件下,包头50混合稀土精矿的精矿浸出率达到了74.80%,并且稀土浸出率达到了69.08%,通过化学分析与X射线衍射(XRD)检测可知,用HCl-AlCl_3体系所配成的溶液络合浸出包头50混合稀土精矿,基本上使包头50混合稀土精矿中的氟碳铈矿全部进入溶液中,达到了与独居石分离的目的。
Al3 + and F- can form a stable coordination ion [Al F6] 3-. Therefore, the mixed solution of HCl-AlCl 3 system is used to complex the bastnaesite in the Baotou 50 mixed rare earth concentrate The thermodynamic study shows that the reaction of bastnaesite in the Baotou 50 mixed rare earth concentrate can be carried out spontaneously by the complex solution mixed with HCl-AlCl 3 system. At the same time, the leaching rate and rare earth leaching rate of the mixed rare earth concentrate with complex solution mixed with HCl-AlCl 3 system were obtained. The experimental results showed that when the concentration of hydrochloric acid reached 6.0 mol·L -1, the reaction temperature was controlled at 95 ℃, the concentration of aluminum chloride was 1.0 mol·L-1, the stirring speed was 400 r · min-1, the reaction time was 120 min and the liquid-solid ratio was 20:1. 50 mixed rare earth concentrate concentrate leaching rate reached 74.80%, and rare earth leaching rate reached 69.08%, by chemical analysis and X-ray diffraction (XRD) testing shows that the solution with HCl-AlCl 3 system complex leaching Baotou 50 mixed rare earth concentrate, Baotou 50 basically mixed rare earth concentrate bastnaesite all into the solution, to achieve the purpose of separation with monazite.