The main research topics are the recycling utilization of scandium from hydrolyzed sulfuric acid of titanium dioxide production and the separation of titanium from the scandium-loaded organic solvent. Based on the experiments of the extracting scandium from hydrolyzed sulfuric acid of titanium dioxide production in di-(2-ethylhexyl) phosphoric acid(P204)-tributyl phosphate(TBP)-sulfonated kerosene system

the extraction isotherm of scandium was plotted

which gave a foundation to carry out the experiments of counter-current extraction. The EL eluant was proposed to do with organic phase containing scandium and titanium after the experiment of counter-current extraction

which could remove titanium from the organic phase. Finally

the main influencing factors of stripping efficiency of scandium were investigated. The results show that the di-(2-ethylhexyl) phosphoric acid-tributyl phosphate-sulfonated kerosene system not only can realize the recovery and enrichment of scandium but also preliminarily separate scandium from other metallic elements

such as titanium

iron and so on. In the experiments of elution

the elution efficiency of titanium can reach 98% through three-stage countercurrent elution

with just a loss ratio of scandium for 4%

which means the better separation result of scandium and titanium. Then the stripping rate of scandium can reach more than 97% with sodium hydroxide added to the raffinate. All in all

the purity of the final product of scandium can reach 85% through the process of extraction

elution and stripping.