Gold Leaching in an Alkaline Thiourea Solution

1999 ◽  
Vol 146 (2) ◽  
pp. 559-563 ◽  
Author(s):  
Dawei Wei ◽  
Liyuan Chai ◽  
Ryoichi Ichino ◽  
Masazumi Okido
Keyword(s):  
Gold Leaching ◽  
Alkaline Thiourea ◽  
Thiourea Solution

Optimization of efficient stable reagent of alkaline thiourea solution for gold leaching

2003 ◽  
Vol 10 (4) ◽  
pp. 292-296 ◽  
Author(s):  
Yun-yan Wang ◽  
Li-yuan Chai ◽  
Xiao-bo Min ◽  
De-wen He ◽  
Bing Peng
Keyword(s):  
Gold Leaching ◽  
Alkaline Thiourea ◽  
Thiourea Solution ◽  
Stable Reagent

Research status and prospect of gold leaching in alkaline thiourea solution

2006 ◽  
Vol 19 (13) ◽  
pp. 1301-1306 ◽  
Author(s):  
Su Zheng ◽  
Yun-yan Wang ◽  
Li-yuan Chai
Keyword(s):  
Gold Leaching ◽  
Research Status ◽  
Alkaline Thiourea ◽  
Thiourea Solution

Effect of Na2SO3 on electrochemical aspects of gold dissolution in alkaline thiourea solution

1999 ◽  
Vol 53 (3) ◽  
pp. 255-266 ◽  
Author(s):  
Liyuan Chai ◽  
Masazumi Okido ◽  
Wanzhi Wei
Keyword(s):  
Gold Dissolution ◽  
Alkaline Thiourea ◽  
Thiourea Solution

scholarly journals Effect of Stabilizer on Gold Leaching with Thiourea in Alkaline Solutions

Minerals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 89
Author(s):  
Wenjuan Li ◽  
He Shang ◽  
He Zhou ◽  
Yongsheng Song ◽  
Shuilin Zheng ◽  
...  
Keyword(s):  
Activation Energy ◽  
Sodium Silicate ◽  
Cyclic Voltammetry Curve ◽  
Sodium Sulfite ◽  
Alkaline Solutions ◽  
Gold Leaching ◽  
Force Microscopy ◽  
Atomic Force ◽  
Alkaline Thiourea ◽  
The Stability

The present work investigated the comparison of the effects of Na2SO3 and Na2SiO3 on thiourea stabilization, and a systematic study was undertaken to establish the effects of these stabilizers on the stability of alkaline thiourea, both qualitatively and quantitatively. The effects of these stabilizers on the activation energy of alkaline thiourea gold leaching was also studied. The results showed that sodium silicate was more suitable as a stabilizer in this system than sodium sulfite because the peak current of gold dissolution with sodium sulfite was higher than that with sodium silicate, but the inhibition of thiourea decomposition by the former was less obvious than that of sodium silicate in the cyclic voltammetry curve. The quartz crystal microbalance results showed that the quality decreased to about 100 ng cm2 in the presence of a stabilizer, while it increased to 300 ng cm2 in the absence of the stabilizer. It is inferred that gold can be dissolved by alkaline thiourea in the presence of a stabilizer, while it cannot without a stabilizer because of the decomposition of thiourea. This assumption was confirmed by atomic force microscopy measurements. The surface activation energy of Au dissolution decreased from 183.76 to 98.07 kJ/moL with the addition of sodium silicate, indicating that Au dissolution was promoted with the chemical.

Selective dissolution of gold in an alkaline thiourea solution by electrolysis

1997 ◽  
Vol 4 (2) ◽  
pp. 73-78 ◽  
Author(s):  
Chuanfu Zhang ◽  
Liyuan Chai ◽  
Haiyun Zhong ◽  
Masazumi Okido ◽  
Ryouichi Ichino
Keyword(s):  
Selective Dissolution ◽  
Alkaline Thiourea ◽  
Thiourea Solution ◽  
Selective Dissolution Of Gold
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