精铟中铊的氯化脱除

Removal of Thallium by Chlorization from Refined Indium

探索了采用NH4Cl的甘油溶液熔炼除铊来代替传统除铊的方法。研究表明 :NH4Cl的甘油溶液浓度为15 % (质量分数 ) ,熔炼时间为 2 0min ,熔炼温度为 2 2 0℃时 ,可除去精铟中 6 0 %～ 70 %的铊 ,铊含量降低 4 0 μg/g左右。该方法具有纯化效果好、操作简单、能缩短工艺流程、避免了有毒物质的使用的优点。

Thallium elimination from indium by ammonium chloride in glycerin solution was investigated. It is shown that 60%～70% of thallium may be eliminated in 15% NH 4Cl glycerin solution at 220 ℃ for 20 min, i.e. the thallium content is reduced by 4.0 μg/g approximately. The purification effect is quite well, the procedure is simple and the toxic reagent is avoided.