| abstract |
High-quality scandium is efficiently recovered from nickel oxide ore. The present invention includes a leaching step S1 in which Ni oxide ore is charged into a pressure vessel together with sulfuric acid and separated into a leaching solution and a leaching residue under high temperature and high pressure, and a neutralizing agent is added to the leaching solution. Neutralization step S2 for obtaining a Japanese starch and a post-neutralization solution, a sulfurization step S3 in which a sulfurizing agent is added to the post-neutralization solution and separated into nickel sulfide and a post-sulfurization solution, and the post-sulfurization solution is converted to a chelate resin Is adsorbed on the chelate resin to obtain the Sc eluent, and the solvent extraction step S6 is obtained by bringing the Sc eluate into contact with the extractant to obtain the back extract, and neutralized with the back extract. An Sc or precipitation step S7 for adding an agent or oxalic acid to obtain a precipitate, and a baking step S8 for obtaining oxidized Sc by drying and baking the precipitate. [Selection] Figure 1 |