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Mining Technology and Mine Management

Experimental Research on Treatment of Low-grade Gold-bearing Tailings by Combined Process of Concentration and Smelting

  • Dawei FENG , 1, 2 ,
  • Ling WANG , 1
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  • 1. School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China
  • 2. Beijing Key Laboratory of Green Recycling and Extraction of Metals,Beijing 100083,China

Received date: 2020-06-10

  Revised date: 2021-03-29

  Online published: 2021-05-28

Highlights

In order to recover gold from solid waste efficiently,a combined beneficiation and metallurgical test was carried out on gold-bearing tailings.The results of chemical analysis show that the gold content in solid waste is 0.86 g/t.Process mineralogy showes that the main gold minerals are tellurite ore,tellurium-gold-silver ore and gold-bearing tellurium-silver ore,followed by natural gold and silver-gold ore.In the original ore sample,gold is mainly produced in the form of sulfide wrapped gold,accounting for 51.72%,followed by bare gold,accounting for 31.03%,a small amount of gold is produced in the form of quartz wrapped gold,accounting for 17.24%.The original ore sample was vibrated to the particle size of -0.074 mm accounted for 98.15%.According to chemical phase analysis,gold is still mainly produced in the form of sulfide wrapped gold,accounting for 50.00%,with little change.Part of gold is produced in the form of bare gold,accounting for 41.86%,and a small amount is produced in the form of quartz wrapped gold,accounting for 8.14%.It can be seen that grinding can obviously improve the leaching rate of gold.If gold is recovered by flotation,the recovery rate of gold can be increased.At the same time,it can also be seen that the recovery rate of gold is less than 50% by direct cyanidation leaching method,and the gold in the ore sample needs to be recovered by the combined process of concentration and smelting.The flotation gold concentrate pretreatment leaching process for gold concentrate should be adopted to recover gold.The closed circuit process of “one roughing-two sweeping-two cleaning” was adopted.Gold concentrate with the yield of 14.23%,gold grade of 5.21 g/t and gold recovery of 86.21% can be obtained.When the gold concentrate is grinded to -0.037 mm accounted for 70.12%,the leaching rate of direct cyanide gold is 41.60%.The main barrier effecting the gold leaching is that most gold is wrapped by pyrite and gold minerals are mainly tellurite,tellurite,gold-bearing silver tellurite,etc.The oxidizing roasting-leaching improved the leaching rate effectively.The suitable conditions for the oxidation roasting cyanidation leaching of gold concentrate are:The temperature of oxidation roasting is 750 ℃,the roasting time is 60 min,and the fineness of the roasting sand is -0.037 mm accounted for 85%,pulp concentration is 33%,pulp pH value is 10.5,sodium cyanide dosage is 10 kg/t,leaching time is 24 h.Under these conditions,the cyanide leaching rate is of gold is 73.76%,compared with the direct cyanide index of gold concentrate (cyanide leaching rate is 41.60%),the cyanide leaching rate of gold is increased by 32.16%.

Cite this article

Dawei FENG , Ling WANG . Experimental Research on Treatment of Low-grade Gold-bearing Tailings by Combined Process of Concentration and Smelting[J]. Gold Science and Technology, 2021 , 29(2) : 315 -323 . DOI: 10.11872/j.issn.1005-2518.2021.02.104

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2020年世界八大金企产量下降6.5%

据Mining Weekly报道,数据分析企业环球数据公司(GlobalData)的报告显示,世界前八大黄金生产商,即纽蒙特(Newmont)、巴里克黄金公司(Barrick Gold)、盎格鲁阿散蒂黄金公司(AngloGold Ashanti)、极地黄金公司(Polyus)、金罗斯(Kinross)、金田(Gold Fields)、新峰(Newcrest)和阿格尼克伊戈尔(Agnico-Eagle)2020年产量为2 498万盎司,较上年下降6.5%。

产量萎缩的原因是矿石品位下降,资产出售,选矿量减少以及回收率下降。减少最明显的是产量排名前3位的黄金公司:纽蒙特产量下降6.1%,巴里克公司下降12.9%,盎格鲁阿散蒂公司下降7.1%。这几家公司合计产量从2019年的1 500万盎司降至2020年的1 370盎司。

环球数据公司项目副经理温尼特·巴贾杰(Vinneth Bajaj)认为,在经历2020年一季度的强劲增长后,纽蒙特公司产量受到了阿哈弗(Ahafo)、亚纳科查(Yanacocha)和梅利安(Merian)矿山产量下降的影响。另外,3月份到5月中旬,塞罗内格罗(Cerro Negro)、亚纳科查、埃雷奥诺雷(Eleonore)、佩纳斯基托(Penasquito)和穆赛尔怀特(Musselwhite)矿山临时停产也是产量下降的原因之一。

除此之外,红湖(Red Lake)和卡尔古利(Kalgoorlie)项目出售进一步减少了产量。

巴里克公司的几家金矿山,包括维拉德罗(Veladero)、旧普韦布洛(Pueblo Viejo)和波尔盖拉(Porgera)等因为Covid-19疫情而被迫临时停产。与此同时,安格鲁阿散蒂公司出售南非资产是其2020年产量下降的主要原因。

2020年第二季度,新峰公司的戈索旺(Gosowong)金矿出售严重影响了该公司的金产量。卡迪亚(Cadia)、利希尔(Lihir)、雷德克里斯(Red Chris)和特尔弗(Telfer)等金矿生产率和品位下降也影响了新峰公司的产量。

不过,环球数据指出,今年这八家黄金企业产量出现回升,预计产量在2 500万盎司至2 575万盎司,较2020年增长3.1%。

http://www.goldsci.ac.cn/article/2021/1005-2518/1005-2518-2021-29-2-315.shtml

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