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Gold Science and Technology ›› 2018, Vol. 26 ›› Issue (5): 682-688.doi: 10.11872/j.issn.1005-2518.2018.05.682

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Treatment of Xiajiadian Gold Mine with Environment-friendly Reagent Jinchan as a Substitute for Sodium Cyanide

Hefu LI1,Hao SUN1,Guohua YE2,Xiaofeng QUE1,Yawei WANG1,Yang CHEN1,Bin CHEN1   

  1. 1 Shanyang Qinding Mining Co.，Ltd.，Shangluo 726400，Shaanxi，China
    2 Faculty of Land Resource Engineering，Kunming University of Science and Technology，Kunming 650093，Yunnan，China
  • Received:2018-06-16 Revised:2018-08-28 Online:2018-10-20 Published:2018-10-31

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Abstract:

Environmental-friendly reagent Jinchan was used as a substitute for sodium cyanide to treat Xiajiadian gold mine,and the leaching effect of Jinchan and sodium cyanide was compared.The results showed that the leaching rate of Jinchan and sodium cyanide was 88.55% and 88.73% respectively,which was basically the same when the dosage of reagents was 200 g/t；When Jinchan dosage was 300 g/t，the leaching rate of 89.87% could be obtained，which was obviously better than the leaching effect of sodium cyanide under the optimal conditions；When using Jinchan，the adsorption and desorption effects were the same as that of sodium cyanide,with gold desorption rate of 98.99% and 98.97%, respectively；Jinchan as a substitute for sodium cyanide，could significantly improve technical and economic indicators，and moreover，in view of the non-toxicity of Jinchan，the invisible benefits of transportation，management，environmental protection and safety also would be obtained.

Key words: gold, cyanidation, non-cyanidation, environment-friendly reagent, leaching, absorption, desorption

CLC Number: 

  • TD953

Table 1

Multi-element analysis of raw ore （%）"

成分 质量分数 成分 质量分数
Au 1.42 Na2O 0.28
Ag 3.6 S 0.026
Cu 0.014 P 0.36
Pb 0.008 TFe 2.30
Zn 0.043 TC 0.18
Ni 0.011 V2O5 0.58
Co 0.006 SiO2 89.51
As 0.0115 Al2O3 2.06
Sb 0.0078 TiO2 0.14
Mo 0.013 CaO 1.30
Mn 0.16 MgO 1.34
K2O 0.78 LOI 0.86

Table 2

Au phase analysis of raw ore"

相别 质量分数/×10-6 分布率/%
合计 1.42 100.00
裸露及半裸露金 1.30 91.59
硫化物中包裹金 0.02 1.41
碳酸盐中包裹金 0.05 3.52
硅酸盐中包裹金 0.03 2.12
铁氧化物中包裹金 0.02 1.36

Fig.1

Chemical structure diagram of carbonated cyanuric acid sodium"

Table 1

Leaching effect comparison of laboratory experiments"

药剂名称 药剂用量/（g·t-1） 矿浆浓度/% 磨矿（-200目占比）/% 浸出时间/h 浸出率/%
NaCN 200 40 65 24 88.73
NaCN 300 40 65 24 88.73
金蝉 200 40 65 24 88.55
金蝉 300 40 65 24 89.84
金蝉 400 40 65 24 89.84

Table 4

Comparison of leaching effect under industrial experiments"

工业试验编号 “金蝉”用量/（g·t-1） NaCN用量/（g·t-1） 磨矿细度（-200目占比）/% 矿浆质量浓度/% 原矿品位/（×10-6） 浸出率/%
① - 300 64.86 40 1.46 88.80
② - 200 64.25 40 1.43 88.75
③ - 200 64.66 40 1.46 88.77
④ 200 - 65.02 40 1.46 88.50
⑤ 300 - 65.81 40 1.44 89.87
⑥ 300 - 66.02 40 1.32 89.82
⑦ 400 - 66.05 40 1.44 89.87

Table 5

Comparison of carbon adsorption effects when leaching gold with Jinchan and NaCN"

药剂名称 吸附时间/h 炭密度/（g·L-1） 尾液品位/（g·m-3） 吸附率/%
NaCN 16 15 0.017 98.51
金蝉 16 15 0.019 98.32

Table 6

Comparison of desorption indexes of gold-loaded carbon when leaching gold with Jinchan and NaCN"

药剂名称 载金炭品位/（×10-6） 解吸时间/h 解吸贫碳品位/（×10-6） 解吸率/%
NaCN 3 295.51 11 33.78 98.97
金蝉 3 270.01 11 32.87 98.99

Table 7

Comparison of technical and economic indicator when leaching gold with Jinchan and NaCN"

药剂名称 年处理矿石量/（×104t） 药剂用量/t 药剂价差/万元 节约药剂成本/万元 金回收增加效益/万元 合计增效/万元
NaCN 10 20 - - - -
金蝉 10 30 1.25 9.6 33.23 42.83
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