Recovery of scandium from silicate minerals by high-pressure leaching in sulfuric acid  

作　　者：Peng Yan Xiaoming Chen Likun Gao Bo Yang 

机构地区：[1]Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming,650093,China [2]Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunming,650093,China [3]School of Chemistry and Chemical Engineering,Kunming University,Kunming,650214,China

出　　处：《Journal of Rare Earths》2024年第7期1375-1384,I0007,共11页稀土学报（英文版）

基　　金：Project supported by Yunnan Province Basic Research Program(202101AT070141)。

摘　　要：This study investigated the leaching of scandium from a Sc-bearing silicate ore.The Sc concentrate obtained by beneficiation pre-enrichment has 1.03×10^(−4) wt%Sc and 14.66 wt%Fe.The main Sc-bearing minerals are limonite,chlorite,sericite,and hornblende,in the form of isomorphism.High-pressure leaching(HPL)with sulfuric acid(98 wt%)and NaF was used to dispose this samples.The Sc leaching efficiency of 91.82%was obtained under the optimum conditions,which are pressure of 5.0×10^(5) Pa,A/O value of 1.1,L/S value of 1.8,NaF dosage of 2 wt%,at 130℃ for 6 h.The X-ray diffraction(XRD)and scanning electron microscopy(SEM)results show that the residue is mainly quartz phase in the multihole shape.Compared with ordinary leaching for silicate,high-pressure leaching has significant advantages in saving acid and energy consumption.

关 键 词：Silicate minerals SCANDIUM High-pressure LEACHING Concentrated sulfuric acid Rare earths 

分 类 号：TF845.1[冶金工程—有色金属冶金]