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

黄金科学技术 ›› 2023, Vol. 31 ›› Issue (2): 349-358.doi: 10.11872/j.issn.1005-2518.2023.02.166

• 冶炼技术与装备研发 • 上一篇

电沉积法从硫氰酸盐浸金液回收金的试验研究

曾超聪¹(),张广盛²,吴为荣²,黄万抚^1,^3,⁴(),李新冬^3,⁴,王泽凯¹,刘观发¹

^1.江西理工大学资源与环境工程学院，江西赣州 341000
^2.江西三和金业有限公司，江西德兴 334200
^3.江西理工大学赣州市赣江流域水质安全保障技术创新中心，江西赣州 341000
^4.江西理工大学赣州市流域污染模拟与控制重点实验室，江西赣州 341000

收稿日期:2022-11-07 修回日期:2023-02-15 出版日期:2023-04-30 发布日期:2023-04-27
通讯作者: 黄万抚 E-mail:1697284463@qq.com;sim2008@sina.com
作者简介:曾超聪（1997-），男，江西赣州人，硕士研究生，从事稀贵金属冶金研究工作。1697284463@qq.com
基金资助:
国家自然科学基金项目“超细粒群在离心流化场内的流膜复合运动规律及松散分选理论研究”(51864017)

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

Chaocong ZENG¹(),Guangsheng ZHANG²,Weirong WU²,Wanfu HUANG^1,^3,⁴(),Xindong LI^3,⁴,Zekai WANG¹,Guanfa LIU¹

^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 E-mail:1697284463@qq.com;sim2008@sina.com

摘要/Abstract

摘要：

针对硫氰酸盐浸金液金回收效率低且成本高等问题，利用电沉积法从硫氰酸铵浸金液中回收金。采用单因素法研究了阳极材料、阴极材料、极间距、槽电压、溶液pH值和温度对金沉积率的影响，结果表明：以石墨棒作阳极、自制电极作阴极，在极间距为10 mm、槽电压为4 V、溶液pH=12和温度为35 ℃的条件下，电解2 h，金沉积率达到98.95%。采用响应面法研究了槽电压、溶液pH值与溶液温度之间的交互作用及其对金沉积率的影响，结果表明：各因素对金沉积率的影响程度依次为槽电压>溶液pH值>溶液温度，并建立了电沉积金响应面回归模型。在槽电压为4.10 V、溶液pH=12.40和温度为39.58 ℃的最佳条件下，模型预测值为99.06%，试验平均值为99.04%，二者结果非常接近，证明该模型能够对金沉积率进行准确的分析预测。本研究进一步完善了硫氰酸盐提金工艺理论体系。

关键词: 硫氰酸盐浸金液, 电沉积法, 电极材料, 金沉积率, 响应曲面法

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

中图分类号:

TF831

曾超聪,张广盛,吴为荣,黄万抚,李新冬,王泽凯,刘观发. 电沉积法从硫氰酸盐浸金液回收金的试验研究[J]. 黄金科学技术, 2023, 31(2): 349-358.

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.

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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

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电沉积法从硫氰酸盐浸金液回收金的试验研究

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

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