Experimental Study on Recovery of Gold from Ammonium Thiocyanate Leaching Solution by Electrodeposition
Received date: 2022-11-07
Revised date: 2023-02-15
Online published: 2023-04-27
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.
Chaocong ZENG , Guangsheng ZHANG , Weirong WU , Wanfu HUANG , Xindong LI , Zekai WANG , Guanfa LIU . Experimental Study on Recovery of Gold from Ammonium Thiocyanate Leaching Solution by Electrodeposition[J]. Gold Science and Technology, 2023 , 31(2) : 349 -358 . DOI: 10.11872/j.issn.1005-2518.2023.02.166
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