Solvent Extraction of Niobium from Alkali Solution by Methyltrioctylammonium Chloride  

作　　者：ZHOU Kang-gen TOKUDA Masanori 

机构地区：[1]Metallurgical Separation Science and Engineering Lab.,Central South University,Changsha 410083,China [2]Tohoku University,Sendai 980-77,Japan

出　　处：《Journal of Central South University》2000年第4期175-177,共3页中南大学学报（英文版）

基　　金：TheKeyProjectofScienceandTechnologyAgencyofJapan 1994

摘　　要：For the purpose of developing an alkali leaching solvent extraction directly from alkali solution process, the extraction of niobium from alkali solution by long chain alkyl quaternary ammonium salt (methyltrioctylammonium chloride R 4NCl) in toluene was investigated. The experiments were carried out under conditions of 25 ℃, Nb(Ⅴ) concentration 0.01 mol/L, pH 10.7 13.8, R 4NCl concentration 0.02 0.14 mol/L. It has been found that the distribution ratio of niobium increases with increasing R 4NCl concentration and with decreasing KCl concentration, but it shows maximum value at pH value of about 12 and decreases below or above this pH value. Distribution ratio of niobium goes up to over 1 000 in appropriate conditions, and so it has been proved that R 4NCl is an effective extractant for extraction of niobium from alkali solution.For the purpose of developing an alkali leaching-solvent extraction directly from alkali solution process, the extraction of niobium from alkali solution by long-chain alkyl quternary ammonium salt (methyltrioctylammonium chloride R4NCl) in toluene was investigated. The experiments were carried out under conditions of 25 °C, Nb(V) concentration 0.01 mol/L, pH 10.7–13.8, R4NCI concentration 0.02–0.14 mol/L. It has been found that the distribution ratio of niobium increases with increasing R4NCl concentration and with decreasing KCl concentration, but it shows maximum value at pH value of about 12 and decreases below or above this pH value. Distribution ratio of niobium goes up to over 1 000 in appropriate conditions, and so it has been proved that R4NCl is an effective extractant for extraction of niobium from alkali solution.

关 键 词：NIOBIUM SOLVENT EXTRACTION distribution RATIO methyltrioctylammonium CHLORIDE 

分 类 号：TF111[冶金工程—冶金物理化学]