Recovering Scandium from Scandium Rough Concentrate Using Roasting-Hydrolysis-Leaching Process

Processes

Kai Zou¹  Zhen Wang¹  Junhui Xiao¹  Tao Chen¹  Wei Ding¹  Yang Peng¹ 

[1] Sichuan Engineering Lab of Non-Metallic Mineral Powder Modification and High-Value Utilization, Southwest University of Science and Technology, Mianyang 621010, China;

关键词: scandium;    scandium rough concentrate;    roasting;    hydrolysis;    leaching;   

DOI  :  10.3390/pr8030365

来源: DOAJ

【 摘 要 】

In this study, a roasting-hydrolysis-acid leaching process is used to extract scandium from the scandium rough concentrate. The scandium rough concentrate containing Sc₂O₃ of 76.98 g/t was obtained by magnetic separation, gravity separation, and electric separation from Sc-bearing Vi-Ti magnetite tailings in the Panxi area of China. The majority of scandium in scandium rough concentrate mainly occurs in diopside, titanopyroxene, montmorillonite, chlorite, talc, aluminosilicate minerals, and isomorphism. Sodium salt and scandium coarse concentrate are added into the roasting furnace for roasting, which makes the fusion reaction of silicon, aluminum and sodium salt to produce soluble salts such as sodium silicate and sodium metaaluminate. Scandium is further recovered from the hydrolysis residue by acid leaching. Test results show scandium leaching recovery of 95.12% and the acid leaching residue with Sc₂O₃ content of 8.12 g/t are obtained, while the extraction of scandium is obvious. There is no obvious peak value of Scandium spectrum in hydrochloric acid leach residue. Most of scandium in hydrolytic residue is dissolved into Sc³⁺ and enters into the liquid phase. The main minerals in leach residue are perovskite, ferric silicate, and olivine.

【 授权许可】

Unknown