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黄金科学技术 ›› 2021, Vol. 29 ›› Issue (1): 164-172.doi: 10.11872/j.issn.1005-2518.2021.01.114

• 采选技术与矿山管理 • 上一篇    

甘肃某难选金铜氧化矿浮选试验研究

李恒()   

  1. 中国有色金属工业西安勘察设计研究院有限公司,陕西 西安 710061
  • 收稿日期:2020-06-22 修回日期:2020-08-20 出版日期:2021-02-28 发布日期:2021-03-22
  • 作者简介:李恒(1992-),男,陕西宝鸡人,助理工程师,从事难处理金矿选矿研究工作。980848142@qq.com
  • 基金资助:
    英国子午线矿业公司获得巴西喀巴卡项目;的关键许可

Experimental Research on Flotation of a Refractory Gold and Copper Oxide Ore in Gansu

Heng LI()   

  1. Xi’an Engineering Investigation and Design Research Institute of China National Non-ferrous Metals Industry Co. ,Ltd. ,Xi’an 710061,Shaanxi,China
  • Received:2020-06-22 Revised:2020-08-20 Online:2021-02-28 Published:2021-03-22

摘要:

甘肃某难选金铜氧化矿金含量为4.83 g/t,铜含量为1.18%,铜氧化率高达95.87%。铜矿物以难选的硅孔雀石为主,且与脉石矿物关系密切,金与铜矿物呈伴生关系。对原矿工艺矿物学进行了系统的研究,分析了尾矿中铜、金损失的原因。在磨矿细度为-74 μm占80%,Na2S作硫化剂,CuSO4作活化剂,丁基黄药、羟肟酸和25号黑药作捕收剂的条件下,采用一次粗选,四次扫选,粗精矿再磨后三次精选硫化浮选工艺流程,可获得金品位为86.65 g/t、金回收率为89.11%,铜品位为16.93%、铜回收率为71.92%,银品位为216.24 g/t、银回收率为87.26%的金铜精矿。金铜精矿可采用热压预氧化—无氰化工艺流程回收金铜,该选冶流程可为金铜氧化矿的开发利用提供借鉴。

关键词: 金铜氧化矿, 工艺矿物学, 硅孔雀石, 硫化浮选, 组合捕收剂, 金铜精矿

Abstract:

Silicon malachite is an extremely refractory copper oxide mineral,and the focus of chrysocolla flotation research is the development of new reagents.However, the selectivity and price factors of new pharmaceuticals restrict their industrial applications.In order to improve the flotation index under the premise of using conventional flotation reagents, it is very important to conduct process mineralogy research on refractory copper oxide ore.A refractory gold-copper oxide ores in Gansu Province contains Au 4.83 g/t and Cu 1.18%. The oxidation rate of Cu is as high as 95.87%.The copper minerals are mainly chrysocolla, which is difficult to select and closely related to gangue minerals.Gold is associated with copper minerals.Based on the study of mineralogy of raw ore process, the causes of copper and gold losses in tailings were analyzed and discussed.Sulfide flotation was adopted.After grinding,the products with fineness less than 74 μm accounted for 80%.Under the conditions of sodium sulfide as curing reagent, copper sulfate as activator, butyl xanthate, hydroxamic acid and No.25 dithiophosphate as collector, the sulfide flotation process adopted is “roughing once,sweeping four times,and regrinding coarse concentrate for three times”.The results show that the gold-copper concentrate with Au grade of 86.65 g/t, Au recovery rate of 89.11%, Cu grade of 16.93%, Cu recovery rate of 71.92%,Ag grade of 216.24 g/t and Ag recovery rate of 87.26% was obtained.Through analysis,it is believed that there are 4 reasons for the loss of copper and gold in tailings.1)The oxidation rate of copper is high, there are many types of copper minerals,and there are differences in floatability,in addition,silicon malachite is the main copper-bearing mineral, and its floatability is not good.2)There is a phenomenon that fine-grained silicon malachite is wrapped in gangue minerals.3) The tailings screening analysis shows that the copper lost in the tailings is of fine grade,therefore, the loss of this part of copper in the tailings is a reasonable loss.4)The gold phase analysis results show that the distribution rate of silicate-coated gold and carbonate-coated gold in the tailings is 76.38%, and the gold lost in the tailings is mainly wrapped in veins stone minerals.Gold-copper concentrates can be pre-oxidized by hot-pressing and non-cyanide to recover gold and copper.This smelting process can provide a certain reference for the development and utilization of gold-copper oxide copper mine.

Key words: gold-copper oxide ores, processing mineralogy, silicon malachite, sulfide flotation, combined collector, gold-copper concentrate

中图分类号: 

  • TD953

表1

原矿多元素分析结果"

元素含量/%元素含量/%
Ag*12.45MgO3.14
Au*4.83CaO3.74
Cu1.18Al2O315.31
Pb0.02SiO263.73
Zn0.063Na2O0.14
S0.032K2O2.07
As0.13TFe1.03
Mn1.77

表2

铜物相分析结果"

相别含量分布率
合计1.210100.00
硫化相中铜0.0292.40
氧化相中铜1.16095.87
结合相中铜0.0251.73

表3

金物相分析结果"

相别含量/(g·t-1分布率/%
合计5.09100.00
裸露及半裸露金3.7573.67
碳酸盐包裹金0.5911.59
硅酸盐包裹金0.183.54
硫化物包裹金0.5310.41
赤褐铁包裹金0.050.79

表4

矿物组成及相对含量"

矿物名称含量矿物名称含量
角闪石6.02石英7.55
斜长石60.38绿泥石6.93
钾长石15.76黑云母3.36

图1

磨矿细度试验流程"

图2

磨矿细度试验结果"

图3

调整剂种类试验结果注:对比试验各药剂用量均为最佳用量;A为Na2S(1 500 g/t);B为Na2S+(NH4)2SO4(1 500 g/t+500 g/t);C为Na2S+水玻璃(1 500 g/t+500 g/t);D为Na2S+水玻璃(1 500 g/t+500 g/t);E为Na2S+(NaPO3)6 (六偏磷酸钠)(1 500 g/t+500 g/t);F为三乙醇胺(60 g/t);G为Na2S+CuSO4(1 500 g/t+500 g/t)"

图4

Na2S用量试验结果注:试验条件为磨矿细度为-74 μm占80%,CuSO4用量为500 g/t,丁基黄药用量为200 g/t,羟肟酸用量为100 g/t,25号黑药用量为32 g/t"

图5

CuSO4用量试验结果注:试验条件为-74 μm粒径占80%,Na2S用量为1 500 g/t,丁基黄药用量为200 g/t,羟肟酸用量为100 g/t,25号黑药用量为32 g/t"

图6

捕收剂种类试验结果注:对比试验各药剂用量均为最佳用量;A为丁基黄药+25号黑药+异羟肟酸(200 g/t+32 g/t+60 g/t); B为丁基黄药+25号黑药+ZH(200 g/t+32 g/t+60 g/t); C为丁基黄药+25号黑药+ML(200 g/t+32 g/t+60 g/t);D为丁基黄药+丁胺黑药+基异羟肟酸(200 g/t+100 g/t+60 g/t);E为丁基黄药+丁胺黑药+ZH(200 g/t+100 g/t+60 g/t);F为丁基黄药+丁胺黑药+ML(200 g/t+100 g/t+60 g/t);G为丁基黄药+丁胺黑药+羟肟酸(200 g/t+100 g/t+60 g/t);H为丁基黄药+25号黑药+羟肟酸(200 g/t+32 g/t+60 g/t)"

图7

捕收剂用量试验注:试验(a)~试验(b)的药剂制度依次为CuSO4 900 g/t+羟肟酸100 g/t+25号黑药32 g/t+Na2S 1 500 g/t,CuSO4900 g/t+Na2S 1 500 g/t+丁基黄药100 g/t+羟肟酸100 g/t,CuSO4 900 g/t+Na2S 1 500 g/t+丁基黄药100 g/t;试验(c)的药剂制度为+25号黑药48 g/t"

图8

闭路试验流程"

表5

闭路试验结果"

产品名称产率/%品位回收率/%
Cu/%Au/(g·t-1)AgCuAuAg
金铜精矿5.0216.9385.65216.2471.9289.1187.26
尾矿94.980.350.551.6728.0810.8912.74
原矿100.001.184.8212.44100.00100.00100.00

表6

尾矿粒度筛选结果"

粒度/mm占有率/%铜品位/%铜分布率/%
合计100.00.35100.0
+0.1502.720.221.70
-0.150+0.07532.590.2926.99
-0.075+0.04522.220.2918.18
-0.045+0.03855.560.314.83
-0.0385+0.030812.390.3110.80
-0.030824.520.5437.50

表7

尾矿金物相分析结果"

相别含量/(g·t-1分布率/%
合计0.56100.00
裸露及半裸露金0.0285.00
碳酸盐包裹金0.18733.54
硅酸盐包裹金0.24042.84
硫化物包裹金0.0162.83
赤褐铁包裹金0.08915.79

表8

金铜精矿产品质量分析结果"

元素含量元素含量
Au*85.65S0.85
Ag*216.24As0.16
Cu16.93Zn0.092
MgO3.07Bi+Sb<0.1
Pb0.039
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