合金渣中铪的MIBK萃取分离试验

采用MIBK作为萃取剂,在盐酸体系下,对含铪合金渣中的铪进行萃取分离试验,主要考察合金渣中含量较高的锆、钛、铬和铪在萃前液不同氢离子浓度、NH4SCN浓度、有机相HSCN浓度及相比下的分离性能。结果表明,铪和锆钛分离难度较大、和铬分离较易,铪的最优分离条件为:萃前液氢离子浓度0.96mol/L、萃前液NH4SCN浓度2.56mol/L、有机相HSCN浓度2.73 mol/L、相比1。在最优条件下,铪和锆的相对分离系数为6.63,铪的分配比为1.79,对于锆含量较低的合金渣,可以有效提升锆铪分离效率,钛最好于萃取分离前进行分离。

Solvent Extraction of Hafnium from Alloy Scrap in MIBK System

Solvent extraction of hafnium from alloy scrap in hydrochloric acid system was developed with MIBK as extractant. Extraction performances of zirconium, hafnium, titanium and chromium under different technological parameters including hydrogen ion concentration in aqueous phase, NH4SCN concentration in aqueous phase, HSCN concentration in organic phase, and phase ratio O/A were investigated. The results show that hafnium separation from zirconium and titanium is more difficult than that from chromium. Relative separation coefficient of hafnium and zirconium is 6.63 with distribution ratio of hafnium of 1.79 under the optimum conditions including hydrogen ion concentration in aqueous phase of 0.96 mol/L, NH4SCN concentration in aqueous phase of 2.56 mol/L, HSCN concentration in organic phase of 2.73 mol/L, and O/A=1. This technology can promote separation efficiency of hafnium and zirconium to the lower mass ratio of Zr/Hf. Titanium should be separated before extraction.