The Separation of the Impurities in Bismuth Metal by Ion Exchange Resins and Colorimetric Determination

[摘要] Two methods for separation of the impurities from bismuth metal have been found by the use of Dowex 1¡¿4, anion exchange resins. The first method is that Dowex 1¡¿4 resins are packed into the two stage columns (height of under stage is 22cm and upper stage is 3cm, and diameter of columns are 1.5cm), and the impurties of Pb(¥±), Ag(¥°) and Cu(¥±) are separated by the eluent of 7.5M HCl soln, Zn(¥±), Fe(¥²) by 0.5M HCl solns, and Te(¥³) in the upper stage by 2M NaOH soln. Remained Au(¥²) in the upper stage is determined by the ignition with resins. The 2nd method is that for the separation of all the impurities simultaneously the same resins are packed into single stage column(height is 10cm and diameter is 1.5cm), and all the impurities of Pb(¥±), Zn(¥±), Cu(¥±), Fe(¥²) and Ag(¥°) are eluted by the eluent of 0.5M HCl soln. Separated impurities are determined by the colorimetry.

[学科分类] 化学（综合）