摘要
本文叙述了稀土提取工艺过程中矿石、离子交换树脂和液体样品中稀土总量的测定方法及其应用。本法采用过氧化钠熔矿、三乙醇胺和柠檬酸钠浸取,在弱酸介质中,以PMBP-苯萃取,甲酸反萃取。然后,在pH 3的醋酸盐缓冲介质中,用偶氮胂M分光光度测定矿石中稀土总量。离子交换树脂中总稀土的测定,在加热条件下,用盐酸和硝酸混合液浸出,可直接分光光度法测定。总稀土与偶氮胂M形成络合物,最大吸收在640nm,表观摩尔吸光系数为8.0×10~4·L·mol^(-1)·cm^(-1)。本法测定稀土的范围为0.005％—0.5％和0.001—1.09/L时,相对标准偏差小于5％。回收率为98.5—10.5％。方法灵敏,操作简单,快速。
A method for determination of rare earths in ores, ion-exchange resins and solution samples has been developed. The ore is molien with sodium peroxide and the molten sample is leached with triethenol amine and sodium citrate. In weakly acid medium, the rare earths can be extracted by PMBP-phenol solution, and stripped with formic acid. In the aceticl acid-sodium acetate buffer medium of pH3 , +he spectropholometric determination of rare earths with arsenazo M has been made. The rare earths in ion exchange resins can be directly determined spectrophotometry after leaching with hydrochloric acid and at heated condition. The rare earths with arsenazo M from a red complex. The maximum absorption of the complex is at 640 nm, and the molar absorption is 8.0 × 104L-mol-1·cm-1. While the range of determination is 0.005%-0.5% and 0.001-1.0g/L, the relative standard deviation is less than 5%, and recovery of rare earths is 98.5-105%. The method is rather simple and rapid.
出处
《铀矿冶》
CAS
1989年第1期27-33,共7页
Uranium Mining and Metallurgy
关键词
稀土
矿石
树脂
分光光度
测定
Rare earths Ore Resin Spectrophotomefry
