电沉积法从硫氰酸盐浸金液回收金的试验研究

doi:10.11872/j.issn.1005-2518.2023.02.166

Abstract

Abstract:

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

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.

Figures/Tables 12

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References 0

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离子种类	质量浓度/（mg·L^-1）	离子种类	质量浓度/（mg·L^-1）
Au⁺	15.25	Pb²⁺	0.05
Fe³⁺	520	Ag⁺	2.69
SCN^-	1 718.712	Cu²⁺	11.25

序号	A	B	C	金沉积率/%
序号	A	B	C	实际值	预测值	残差值
1	0	0	0	99.10	98.81	0.2860
2	1	0	-1	95.53	95.51	0.0200
3	0	0	0	98.89	98.81	0.0760
4	-1	0	-1	90.81	91.02	-0.2075
5	0	-1	1	94.29	94.43	-0.1412
6	-1	-1	0	90.23	90.07	0.1613
7	0	0	0	98.95	98.81	0.1360
8	1	-1	0	94.76	94.83	-0.0662
9	-1	1	0	91.54	91.47	0.0663
10	0	-1	-1	93.51	93.46	0.0463
11	-1	0	1	91.70	91.72	-0.0200
12	1	0	1	97.77	97.56	0.2075
13	0	0	0	98.81	98.81	-0.0040
14	0	1	1	96.61	96.66	-0.0462
15	1	1	0	96.89	97.05	-0.1612
16	0	0	0	98.32	98.81	-0.4940
17	0	1	-1	95.01	94.87	0.1413

项目	平方和	自由度	均方差	F值	P值	显著性
总计	149.65	16
模型	149.11	9	16.57	213.97	< 0.0001	显著
A-槽电压	53.41	1	53.41	689.75	< 0.0001
B-溶液pH值	6.59	1	6.59	85.09	< 0.0001
C-溶液温度	3.80	1	3.80	49.01	0.0002
AB	0.1681	1	0.1681	2.17	0.1841
AC	0.4556	1	0.4556	5.88	0.0457
BC	0.1681	1	0.1681	2.17	0.1841
A²	42.60	1	42.60	550.17	< 0.0001
B²	21.85	1	21.85	282.26	< 0.0001
C²	11.89	1	11.89	153.62	< 0.0001
残差	0.5420	7	0.0774
失拟误差	0.1919	3	0.0640	0.7307	0.5853	不显著
纯误差	0.3501	4	0.0875

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

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