Separation and purification of tantalum from plumbomicrolite of amazonite deposit in Kola Peninsula by acid leaching and solvent extraction  

酸浸法和溶剂萃取法分离提纯Kola Peninsula铅细晶矿中的钽

作　　者：S M MASLOBOEVA L G ARUTYUNYAN M N PALATNIKOV D V MANUKOVSKAYA 

机构地区：[1]Tananaev Institute of Chemistry–Subdivision of the Federal Research Centre,Kola Science Centre of the Russian Academy of Sciences,Apatity 184209,Russia

出　　处：《Journal of Central South University》2021年第1期72-88,共17页中南大学学报（英文版）

基　　金：Project supported by the Federal Research Centre of Kola Science Centre of the Russian Academy of Sciences,Russian。

摘　　要：A plumbomicrolite concentrate(PMC)was leached with the mixture of HF and H2SO4,HF and HNO3 acids,respectively.Optimal conditions ensuring high recovery of tantalum and niobium(up to 99%)into solution,and radionuclides into insoluble residue were determined.Fluoride-sulfuric acid and fluoride-nitric acid schemes were proposed for PMC leaching by an extractive separation of tantalum form niobium,lead and impurities,and production of high-purity tantalum compounds.Octanol-1 was used as an extractant.Optimal conditions for production of high-purity tantalum strip solutions were defined for all stages(extraction-scrubbing-stripping).Produced tantalum compounds,such as tantalum pentoxide and potassium heptafluotanthalate,comply with the norms for high-purity substances in terms of impurities content.Final choice of the PMC processing scheme is determined by its profitability.采用了氢氟酸和硫酸、氢氟酸和硝酸的混合酸浸出法,对铅细晶矿进行了浸取分离。在最佳条件下,钽和铌的收率达到99%,同时并确保放射性核素留在不溶性残渣中。提出了采用氟酸-硫酸和氟酸-硝酸萃取分离钽与铌、铅和杂质的浸出方案,并生产高纯钽化合物。确定了辛醇-1作为萃取剂,反萃生产高纯钽的各阶段萃取-洗涤-反萃的最佳条件。生产出的钽化合物,如五氧化二钽和七氟戊二酸钾,杂质含量符合高纯物质的标准。

关 键 词：mineral plumbomicrolite TANTALUM NIOBIUM acid leaching RADIOACTIVITY solvent extraction 

分 类 号：TF841.6[冶金工程—有色金属冶金]