KINETIC　STUDY　ON　THE　REMOVAL　OF　LEAD　AND　SILVERFROMCRUDEBISMUTHBYANODEREFINING

作     者：Zhang Yongjian Ren Hongyan Xie Zhong(Department of Non-Ferrous Metallurgy, Central South University of Technology, Changsha, 410083, China) 

作者机构：Department of Non-Ferrous Metallurgy Central South University of Technology Changsha China 

出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)

年 卷 期：1994年第6卷第1期

页      面：59-62页

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070303[理学-有机化学] 0703[理学-化学] 

主　　题：refine of bismuth molten salts electrorefining anode refining 

摘      要：The anode refining process to remove lead and silver from crude bismuth was studied. The study was carried out with chloride melts at 400 ℃ in a crucible-in-crucible type pyrex glass electrolyzer. The kinetic regularity of the removal of lead and silver was found to be in accordance with the equation:Inc=b-kt. Values of constant k were determined for different current *** relationship between the purity of refined bismuth and its direct yield wasalso determined. A two-stage anode refining method was established. The firststage. was to remove most part of lead (about 90%) at higher current density ;the second stage was used for removing silver and the remains of lead at lowercurrent density. Under appropriate conditions high purity (WPb 0.001%,WAd0.004%) of bismuth could be obtained from crude bismuth with the direct yield of bismuth up to 98%.