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中南大学学报(自然科学版)

Journal of Central South University

第34卷    第6期    总第154期    2003年12月

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文章编号:1005-9792(2003)06-0611-04
Na2SiO3对碱性硫脲溶液选择性溶金的影响
王云燕,柴立元,闵小波,彭 兵,何德文

(中南大学冶金科学与工程学院,湖南长沙,410083)

摘 要: 采用电化学方法研究Na2SiO3浓度对碱性硫脲浸金的影响和金及其常见伴生元素银、铜、镍、铁在含有Na2SiO3的碱性硫脲溶液中的电化学行为.研究结果表明:加入Na2SiO3在很大程度上提高了金的溶解电流, Na2SiO3的最佳浓度为0.15 mol/L.分析不同电势时lgJ与lgc(Na2SiO3)之间的关系可得:在电势为0.42 V时, Na2SiO3对碱性硫脲溶液电化学溶金的促进作用最显著,含Na2SiO3的碱性硫脲溶液对金的溶解具有一定的选择性;在电势为0.58 V时溶
金效果最佳,金、银、镍和铁的阳极电流密度分别为2.49, 1.22, 1.03和0.09 mA/cm2;而同时加入Na2SiO3和Na2SO3时碱性硫脲溶液选择性溶金的最佳电势负移至0.42 V,对金的选择性溶解更为明显,金、银、铜、镍和铁的溶解电流密度依次为3.83, 1.13, 0.73, 0.14和0.09 mA/cm2,金的溶解电流密度分别是银、铜、镍和铁的3.4,5.2,27.3和42.6倍.

 

关键字: 碱性硫脲;选择性溶金; Na2SiO3;电化学行为

Effect of Na2SiO3on gold dissolution selectively
in alkaline thiourea solutions
WANGYun-yan,CHAI Li-yuan,MIN Xiao-bo,PENG Bing,HE De-wen

College of Metallurgical Science and Engineering,Central South University, Changsha 410083, China

Abstract:The influence of concentration of Na2SiO3ongold dissolution in alkaline thiourea solutions and the electrochemical behaviors of gold and its associate elements, such as silver, copper, nickel and iron, in alkaline thiourea solutions containing Na2SiO3by electrochemical methods were discussed in detail. The results indicate that addition of  Na2SiO3 into alkaline thiourea solution improves the dissolution current density of gold to a large degree, and the optimal concentration of Na2SiO3 is 0.15 mol/L. The relation of lgiand lgc(Na2SiO3) at different potentials shows that at the potential of 0.42 V, the effect of Na2SiO3 to gold dissolution is the biggest, and the effect of Na2SiO3on gold dissolution into alkaline thiourea solution is the most prominent. Electrochemical behaviors indicate that gold dissolution into alkaline thiourea containing Na2SiO3 is selective. At the potential of 0.58 V, gold dissolution was optimal, and the anodic current densities of gold, silver, nickel and iron are 2.49, 1.22, 1.03 and 0.09 mA/cm2respectively. However, alkaline thiourea solutions containing both Na2SiO3 and Na2SiO3 have good evident selectivity for gold dissolution. The optimal potential moves negatively to 0.42 V, and the selectivity is more evident. The anodic current densities of gold, silver, copper,nickel and iron are 3.83, 1.13, 0.73, 0.14 and 0.09 mA/cm2respectively, and then current density of gold is 3.4,5.2, 27.3 and 42.6 times of silver, copper, nickel and iron respectively.

 

Key words: alkaline thiourea; gold dissolution selectively; Na2SiO3; electrochemical behavior

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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