摘要
研究了粗金中除去铅及提纯的新工艺 .利用HCl-H2 O2 (体积比 5∶1)混合试剂溶样 ,加硫酸钾使铅转化为PbSO4 而除去 ,用无水亚硫酸钠将金还原 ,再用稀硝酸二次除铅 .实验结果表明 :较适宜的溶样条件为温度 5 0℃ ,溶样时间为 3h ,混合溶剂与金的液固比为 6∶1(体积比 ) ;提纯后的金纯度达到 99.9%以上 ,残留铅低于 0 .0 0 2 % .该方法是一种快速。
A new kind of technology that involves in refining crude aurum and eliminating the lead from it has been researched in this paper. Firstly, K 2SO 4 can be put into the mixed sample solution of reagent HCl-H 2O 2(5∶1) which will transform the lead into PbSO 4.Secondy,the aurum can be reduced with an hydrous sodium sulfite.Finally,lead elimination process can be conducted once more by using the diluted nitric acid.The results of the experiment show that the optimum conditions(the temperature is 50 ℃,lasted time is 3 hours,the volume ratio of mixed solution and aurum is 6∶1) are determined;after the purification,the gold purity can be raised to an extent of 99.9 %,and the lead remnants survive merely 0.002%.It is a fast and less pollution measure for gold refining.
出处
《郑州工业大学学报》
2000年第3期93-94,107,共3页
Journal of Zhengzhou University of Technology
