Abstract |
Dowex 1 X 4 음이온 교환수지를 2단계(높이:하단 22cm, 상단 3cm, 직경 1.5cm)로 충전하여 비스머스 금속중에 들어있는 불순물인 Pb(II), Ag(I), Cu(II)를 7.5M 염산으로, 그리고 Zn(II), Fe(III)를 0.5M 염산으로 분리하고 상단에 남아있는 Te(IV)은 2M NaOH 용액으로 용출하고 아직 상단에 남아있는 Au(III)는 수지를 태워서 분리하였다. 또 한가지 방법은 같은 수지를 10cm 높이로 일단계의 관에 충진하여 0.5M 염산으로 Pb(II), Ag(I), Cu(II), Fe(III), Zn(II)를 함께 용출하여 비스머스 중에서 분리하였다. 분리된 모든 불순물은 비색법으로 정량하였다. 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(Ⅱ), Ag(Ⅰ) and Cu(Ⅱ) are separated by the eluent of 7.5M HCl soln, Zn(Ⅱ), Fe(Ⅲ) by 0.5M HCl solns, and Te(Ⅳ) in the upper stage by 2M NaOH soln. Remained Au(Ⅲ) 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(Ⅱ), Zn(Ⅱ), Cu(Ⅱ), Fe(Ⅲ) and Ag(Ⅰ) are eluted by the eluent of 0.5M HCl soln. Separated impurities are determined by the colorimetry. |
