Physicochemical and environmental characteristics of alkali leaching residue of wolframite and process for valuable metals recovery

作     者：Yuan-lin CHEN Xue-yi GUO Qin-meng WANG Qing-hua TIAN Jin-xiang ZHANG Shao-bo HUANG 陈远林;郭学益;王亲猛;田庆华;张金祥;黄少波

作者机构：School of Metallurgy and EnvironmentCentral South UniversityChangsha 410083China Ganzhou Nonferrous Metallurgy Research InstituteGanzhou 341000China Changsha Research Institute of Mining and Metallurgy Co.LTDChangsha 410012China 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2022年第32卷第5期

页      面：1638-1649页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 080603[工学-有色金属冶金] 08[工学] 0806[工学-冶金工程] 

基　　金：the financial supports from the National Key R&D Program of China(No.2019YFC1907400) the National Natural Science Foundation of China(Nos.51904351,51620105013) 

主　　题：alkali leaching residue physicochemical characteristics environmental characteristics valuable metals recovery 

摘      要：Physicochemical and mineralogical characteristics of an alkali leaching residue of wolframite were studied by XRD,SEM−EDS,chemical phase analysis,mineral liberation analyzer(MLA),and TG−DSC *** leaching tests,toxicity characteristic leaching procedure(TCLP)tests and Chinese standard leaching tests(CSLT)were conducted to determine the environmental mobility of toxic *** results show that,due to the high contents of W,Fe,Mn,Sn,and Nb,the residue is with high resource value,but the content of a toxic element,As,is also *** existing minerals of the investigated elements mainly occur as monomer particles,but it is difficult to extract these valuable metals by conventional acid leaching due to their mineral *** release of As increases over time in acidic *** leaching concentration of all investigated harmful elements through TCLP is within the limiting value,while the leaching concentration of As through CSLT exceeds the limiting value by more than 4 times,so the residue is classified as hazardous solid waste based on the Chinese standard.A process for valuable metals recovery from this residue was *** experimental results indicated that the main valuable metals could be extracted effectively.