钪富集物除钛试验研究

Study on Removal of Titanium from Scandium Enrichment

采用(硫酸+双氧水)溶解—二次萃取工艺,利用钛在硫酸—双氧水溶液中与双氧水络合而不被萃入有机相的特性,实现钪富集物中钪与有害杂质钛的充分分离。试验表明,在双氧水∶浓硫酸∶水的体积比为1∶3.5∶20、P204浓度20%、相比A/O=10/1、萃取温度为室温(25℃)、萃取时间5min的最优条件下,钪的二次萃取率达99.85%,大于99.9%的TiO2未进入有机相,达到了去除钪富集物中杂质TiO2的目的。

With regard to titanium cannot be extracted into organic phase when combined with hydrogen peroxide in sulfuric acid-oxygen peroxide solution,scandium in scandium enrichment was separated with main harmful impurity titanium through dilute sulfuric acid + hydrogen peroxide dissolution and secondary extraction process.The results show that secondary extraction rate of scandium is 99.85% and >99.9% of TiO2 does not enter organic phase under the optimum conditions including volume ratio between hydrogen peroxide,concentrated sulfuric acid and water of 1∶3.5∶20,P204 concentration of 20%,A/O= 10/1,extraction temperature of 25 ℃,and extraction time of 5 min.The purpose to remove impurity TiO2 in scandium enrichment is achieved.