A novel approach to extract Nb,Y and Ce from a niobium-bearing ore of low grade by roasting KHSO_(4)-H_(2)SO_(4) system  

作　　者：Wen-Cheng Gao Jian-Kang Wen Biao Wu He Shang Xue Liu 

机构地区：[1]National Engineering Laboratory of Biohydrometallurgy,GRIMAT Engineering Institute Co.,Ltd,Beijing 101407,China [2]GRINM Resources and Environment Tech.Co.,Ltd,Beijing 101407,China

出　　处：《Rare Metals》2021年第7期1979-1986,共8页稀有金属（英文版）

基　　金：China Postdoctoral Science Foundation(No.2014M560922)。

摘　　要：In this work,a novel approach of leaching valuable metals,such as niobium,yttrium and cerium,from a niobium-bearing ore of low grade by roasting KHSO_(4)-H_(2)SO_(4)system was experimentally studied.Through the work,the effects of roasting temperature,roasting time,mass ratio of agents to ore and the types of leaching agents on the extraction of Nb,Y and Ce were investigated,and the roasting KHSO_(4)-H_(2)SO_(4)-ore system was thought as an effective method to extract these valuable metals.It was found that the recovery of Nb,Y and Ce can,respectively,reach 90.20%,97.22%and 98.41%in condition of roasting temperature of 300℃,roasting time of 2 h,mass ratio of KHSO_(4)-to-H_(2)SO_(4)to ore of 0.5:1:1,particle size of-74 lm(~95%),leaching solution of oxalic acid(30 g·L^(-1)),leaching temperature of 90℃and leaching liquid-to-solid ratio of 5:1.The leaching kinetics of the calcined Nb-bearing ore in oxalic acid solution was successfully modeled by chemical reaction model,and the apparent activity energy was obtained to be14.16 kJ·mol^(-1).The results generated from this work will provide the fundamentals for extracting Nb,Y and Ce from a niobium-bearing ore of low grade and have potential applications value in future.

关 键 词：ROASTING Extraction NIOBIUM YTTRIUM CERIUM Low grade 

分 类 号：TF84[冶金工程—有色金属冶金]