采用酸化伯胺A-N1923-酒石酸钠体系从强碱性溶液萃取分离钒铬

来源期刊:中国有色金属学报2016年第7期

论文作者:黄焜 孙盼 刘会洲

文章页码:1559 - 1568

关键词:钒;铬;萃取;分离;碱性溶液;伯胺

Key words:vanadium; chromium; solvent extraction; separation; alkaline solution; primary amine

摘    要:采用酸化伯胺A-N1923-酒石酸钠体系,研究强碱性溶液中的钒、铬萃取分离行为,同时考察铝在钒、铬萃取分离过程中的走向。结果表明:碱性溶液中添加少量的酒石酸钠,可显著抑制钒铬的共萃,即使在浓度大于0.1 mol/L的NaOH溶液中,仍然可以实现钒、铬的萃取分离;钒、铬、铝的萃取分离受酒石酸钠浓度、料液初始碱度、初始钒铬浓度、萃取相比及萃取剂浓度等影响较大。当料液pH值在10~13之间时,钒/铬、铝/铬的分离系数可分别达到89和60。298 K时,有机相对钒的饱和萃取容量为5.855 g/L。萃取负载有机相可以先用0.5 mol/L的硝酸钠溶液选择性反萃铝,然后用1.5 mol/L的硝酸钠溶液反萃钒,反萃后有机相可再生循环使用。

Abstract: A novel liquid-liquid solvent extraction approach was studied by using acidified primary amine A-N1923- sodium tartrate system to separate V and Cr in strongly alkaline aqueous solution. The distribute behavior of Al during the process of extraction and separation of V and Cr was also investigated. The experimental results reveal that co-extraction of V and Cr can be avoided if previously adding sodium tartrate into the aqueous solutions. An effective separation of V and Al from Cr can be achieved even when NaOH concentration is above 0.1 mol/L. The concentrations of sodium tartrate, initial aqueous alkalinity, initial metal ion concentration ratios of V to Cr, extraction phase volume ratio of A/O and the concentration of extractant, acidified primary amine N1923, have significant influence on the separation of V, Cr and Al. When aqueous pH value is between 10 and 13, the separation factors of V/Al and V/Cr can reach 89 and 60, respectively. The extraction loading capacity of V in organic phase can reach 5.855 g/L at 298 K. After extraction, Al can be stripped selectively from the loaded organic phase by 0.5 mol/L sodium nitrate solution, and then, V can be stripped by 1.5 mol/L sodium nitrate solution. The organic phase could be re-used after stripping of V and Al. The present work provides a new strategy to extract and separate V and Cr from the strongly alkaline leaching solution produced by sub-molten salt method for treating the high chromium vanadium-titanium magnetite ores from Panzhihua in China.

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