论文部分内容阅读
The extraction of Sc by acid leaching with CaF2 and solvent extraction with P507 from red mud was proposed. The influence of acid leaching and solvent extraction on recovery of Sc was investigated. The CaF2 can obviously improve the leaching efficiency of Sc and reduce the acid consumption. The leaching efficiency of Sc increases from 74％ to 92％ and the dosage of acid reduces under suitable conditions by adding 5％ CaF2. The minerals in red mud can easily be decomposed and leached into the acid solution with CaF2 through analysis of XRD patt. The particles of red mud become smaller and multihole. The Sc can be selectively extracted with 10％P507 at the pH value of 0.1 from the acid leaching solution. More than 98％of Sc and less than 10％of Al and Fe are extracted. The Sc2O3 with purity of 99％is obtained after the process of reverse extraction with NaOH, H2SO4 dissolution, precipitation by oxalic acid and roasting at 750 ℃.