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Gold Science and Technology ›› 2023, Vol. 31 ›› Issue (2): 349-358.doi: 10.11872/j.issn.1005-2518.2023.02.166

• Metallurge and Equipment • Previous Articles    

Experimental Study on Recovery of Gold from Ammonium Thiocyanate Leaching Solution by Electrodeposition

Chaocong ZENG1(),Guangsheng ZHANG2,Weirong WU2,Wanfu HUANG1,3,4(),Xindong LI3,4,Zekai WANG1,Guanfa LIU1   

  1. 1.School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China
    2.Jiangxi Sanhe Gold Industry Co. , Ltd. , Dexing 334200, Jiangxi, China
    3.Ganzhou Innovation Center for Water Quality Security Technology at Ganjiang River Basin, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China
    4.Ganzhou Key Laboratory of Basin Pollution Simulation and Control, Jiangxi University of Science and Tech-nology, Ganzhou 341000, Jiangxi, China
  • Received:2022-11-07 Revised:2023-02-15 Online:2023-04-30 Published:2023-04-27
  • Contact: Wanfu HUANG;


The leaching agent cyanide has been on the verge of elimination due to its great harm to the environment and human health.The non-cyanide agent thiocyanate as an efficient and environmentally friendly gold leaching agent has become the object of research by scholars both domestic and foreign.However,the recovery methods from thiocyanate leachate are less studied,and there are problems with low efficiency and high cost of gold recovery.Therefore,it is urgent to find a highly productive,low-cost,and simple method to recover gold from leaching solution efficiently.On the basis of the above problems,ammonium thiocyanate was used for the leaching test of bio-oxidized slag from a difficult gold concentrate,and recovered gold from the leaching solution by electrodeposition.The single factor method was used to study the influence of various factors on the gold deposition rate.The results show that the self-made electrode with a large surface area,good corrosion resistance,and high metal deposition efficiency is an excellent cathode.The graphite rods with good conductivity,not involved in the reaction process,reused,is a good choice for anode materials.Stainless steel rods are not suitable as electrode materials due to their susceptibility to corrosion.Under the conditions of electrode spacing of 10 mm,cell voltage of 4 V,solution pH value of 12,and solution temperature of 35 ℃,using a graphite rod as an anode and a self-made electrode as a cathode,the gold deposition rate can reach 98.95%.The interaction between tank voltage,solution pH value,and solution temperature and the effect on gold deposition rate were investigated by response surface methodology,and the electrodeposition gold response surface regression model was established.The P value and mismatch value of the model are within a reasonable range,and the predicted value and actual value of the gold deposition rate basically fell in a straight line,shows that the model fits well and is highly reliable.The correlation between the test factors and the gold deposition rate can be described.The final results show that the degree of each factor on the gold deposition rate is cell voltage>solution pH value>solution temperature,among them,the interaction between cell voltage and solution pH value is the most significant,and the interaction between solution pH value and solution temperature is the least significant.Under the optimal conditions of cell voltage 4.10 volts,solution pH value of 12.40,and solution temperature of 39.58 ℃,the predicted value of the model is 99.06%,and the experimental average value is 99.04%.The two results are remarkably close,which proves that the model can accurately analyze and predict the gold deposition rate.This study further improves the theoretical system of thiocyanate gold extraction process.

Key words: thiocyanate leaching solution, electrodeposition method, electrode material, gold deposition rate, response surface analysis

CLC Number: 

  • TF831


Flow chart of electrolytic stock solution preparation"

Table 1

Main ion content of electrolytic stock solution"

SCN-1 718.712Cu2+11.25


Effect of different cathode materials on gold deposition"


Effect of anode materials in electrodeposit process"


Effect of electrode spacing on electrodeposit process"


Effect of different cell voltage on gold deposition"


Effect of solution pH value on gold deposition rate"


Effect of solution temperature on gold deposition rate"

Table 2

Test scheme and results"


Table 3

Results of variance analysis of regression model"

模型149.11916.57213.97< 0.0001显著
A-槽电压53.41153.41689.75< 0.0001
B-溶液pH值6.5916.5985.09< 0.0001
A242.60142.60550.17< 0.0001
B221.85121.85282.26< 0.0001
C211.89111.89153.62< 0.0001


Analysis chart of actual value and predicted value of gold deposition rate"


Response surface"

Batoeva A A, Tsybikova B A, Ryazantsev A A,2010.Catalytic oxidation of thiocyanates in an acid medium[J].Russian Journal of Applied Chemistry,83(6):993-996.
Cao Geng, Guo Junkang, Ren Qian,et al,2021.Research progress and development trend of non-cyanide gold leaching[J].Applied Chemical Inustry,50(6):1672-1676.
Gianni C, Lorenzo L, Antonio S,2014.Optimization of process parameters using a response surface method for minimizing power consumption in the milling of carbon steel[J].Journal of Cleaner Production,66:309-316.
Huang Biaolin, Huang Lijinhong, Zeng Xiangrong,et al,2021.Leaching of gold from gold concentrate biooxidized slag using ammonium thiocyanate[J].Hydrometallurgy,40(6):451-456.
Jia Yujuan, Wang Xiaohui, Cheng Wei,et al,2019.Research progress on non-cyanide leaching of refractory gold ores[J].Chinese Journal of Engineering,41(3):307-315.
Kholmogorov A G, Kononova O N, Pashkov G L,et al,2002.Thiocyanate solutions in gold technology[J].Hydrometallurgy,64(1):43-48.
Kononova O N, Kholmogorov A G, Danilenko N V,et al,2005.Sorption of gold and silver on carbon adsorbents from thiocyanate solutions[J].Carbon,43(1):17-22.
Kononova O N, Kholmogorov A G, Danilenko N V,et al,2008.Recovery of silver from thiosulfate and thiocyanate leach solutions by adsorption on anion exchange resins and activated carbon[J].Hydrometallurgy,88:189-195.
Li Guichun, Meng Qi, Kang Hua,et al,2020.Electrodeposition of gold in iodine leaching solution[J].Chinese Journal of Nonferrous Metals,30(8):1925-1933.
Li J, Safarzadeh M S, Moats M S,et al,2012a.Thiocyanate hydrometallurgy for the recovery of gold,Part V:Process alternatives for solution concentration and purification[J].Hydrometallurgy,113/114:31-38.
Li J, Safarzadeh M S, Moats M S,et al,2012b.Thiocyanate hydrometallurgy for the recovery of gold,Part IV:Solvent extraction of gold with Alamine 336 [J].Hydrometallurgy,113/114:25-30.
Li Qian, Dong Siyu, Xu Rui,et al,2020.Gold extraction technology for gold ores and its research progress[J].Gold,41(9):86-101.
Ma C J, Li J Y, Liu R J,2015.A review of thiocyanate hydrometallurgy for the recovery of gold[J].Applied Mechanics and Materials,768:53-61.
Neil P G, Nie Guolin,1991.The affinity of activated carbon to some gold(I)complexes[J].Hydrometallurgy,(4):29-34.
Qiu Yibing,2008.Experimental Design and Data Processing[M].Hefei:China University of Science and Technology Press.
Shen Cailong, Yue Fulian, Zhang Guangji,et al,2021.Variation of DO concentration in biological pretreatment of gold ore and its effect[J].The Chinese Journal of Nonferrous Metals,31(1):106-113.
Wang Z, Chen D, Chen L,2008.Gold cementation from thiocyanate solutions by iron powder[J].Minerals Engineering,20(6):581-590.
White H A,1905.The solubility of gold in thiosulphates and thiocyanates[J].South African Journal of Science,1(1):211-215.
Wu Hao, Huang Wanfu, Qiu Feng,et al,2016.Research progress of gold leaching with thiocyanate[J].Noble Metal,37(3):72-78.
Yang Bo, Wang Xiao, Xie Yonggang,et al,2021.Study on the processing mineralogy of a refractory gold ores from Qinghai Province[J].Gold Science and Technology,29(3):467-475.
Bielike Yeernaer,2018.Discussion on gold resources and geological exploration situation in China[J].Nonferrous Metals in the World,(11):133-134.
Zeng Xiangrong,2020.Non-cyanide Leaching Agent-ammonium Thiocyanate Gold Leaching Process and Mechanism[D]. Ganzhou:Jiangxi Unversity of Science and Technology.
Zhai Xiujing, Xiao Bijun, Li Naijun,2008.Reduction and Precipitation[M].Beijing:Metallurgical Industry Press.
Neil P G,聂国林,1991.活性炭对某些金(I)络合物的亲合力[J].湿法冶金,(4):29-34.
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