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黄金科学技术 ›› 2017, Vol. 25 ›› Issue (5): 80-84.doi: 10.11872/j.issn.1005-2518.2017.05.080

• 采选技术与矿山管理 • 上一篇    下一篇

青海高原地区某金矿闪速浮选可行性研究

李飞1,2,陈自强1,2   

  1. 1.青海省第六地质矿产勘查院,青海  西宁   816000;
    2.青海省金矿资源开发工程技术研究中心,青海  都兰   816100
  • 收稿日期:2017-06-28 修回日期:2017-08-11 出版日期:2017-10-30 发布日期:2018-02-12
  • 作者简介:李飞(1987-),男,湖北荆门人,工程师,从事金矿选矿技术工作。376169069@qq.com
  • 基金资助:

    青海省科技支撑计划项目“青海高原(五龙沟地区)难处理金矿采选冶工艺集成与示范”(编号:2015-SF-122)和青海省工程技术研究中心项目“青海省金矿资源开发工程技术研究中心”(2016-GX-G02)联合资助

Feasibility Study of Flash Flotation of a Gold Mine in Plateau Area of Qinghai Province

LI Fei 1,2,CHEN Ziqiang 1,2   

  1. 1.Qinghai 6th Institute of Geology and Mineral Exploration,Xining    816000,Qinghai,China;
    2.The Engineering and Technology Research Center for the Development of Gold Mining Resources in Qinghai Province,Dulan    816100,Qinghai,China
  • Received:2017-06-28 Revised:2017-08-11 Online:2017-10-30 Published:2018-02-12

摘要:

青海高原地区某金矿的原矿属于微细粒蚀变岩型金矿,浮选回收率低,调整浮选工艺参数后浮选效果也未得到明显提升。通过考察磨矿分级工艺并分析旋流器底流粒级筛析发现,旋流器的分级效率为43%~60%,且底流存在金的“反富集”现象,部分粒级金品位达到20×10-6以上,这部分已单体解离的有用矿物循环累积于闭路作业中易产生过磨和矿泥二次包裹,从而限制了有用矿物的可浮性,使得回收率难以有效提升。通过在实验室模拟选厂工艺流程,在一段旋流器底流增加闪速浮选作业进行连续闭路试验,闪速浮选精矿产率达到4.07%,精矿品位达到38.31×10-6。旋流器底流中已单体解离的有用矿物通过闪速浮选能达到“早收快收”的效果,减少了这些有用矿物过磨及矿泥二次包裹的几率。旋流器溢流再磨至选矿厂要求的浮选细度进行常规浮选闭路试验,综合回收率由常规浮选工艺下的80.90%提高至83.96%。

关键词: 磨矿分级, 过磨, 单体解离, 闪速浮选, 高原地区, 青海省

Abstract:

 The raw ore of a gold mine in plateau area of Qinghai Province belongs to fine grained altered rock type,the recovery rate of flotation is low.By adjusting the flotation process parameters,the flotation effect has not been significantly improved.Through investigation of grading classification process and analysis of hydrocyclone’s underflow size sieve,it is found that the classification efficiency of hydrocyclone is 43%~ 60%,and the phenomenon of “anti-enrichment” exist in the underflow,in which the gold content of some particles reached above 20×10-6.Those useful minerals of monomeric dissociation were circulated in closed circuit process and easily causing overgrinding and slime encapsulation,which limited the flotability of useful minerals,so the recovery rate is difficult to effectively enhance.The simulation of manufacturing process was conducted in laboratory,by increasing flash flotation operation at the underflow of a hydrocyclone,the yield of concentrate in flash flotation reached 4.07%,and the grade of gold in concentrate reached 38.31×10-6.The useful mineral of monomeric dissociation in the underflow of a hydrocyclone has been collected by the flash flotation to achieve the effect of “early and quick collection”,reducing the probability of overgrinding and slime encapsulation of these useful minerals.The overflow continued to be ground to the required fineness to carry out closed-circuit test of routine flotation,and the comprehensive recovery of gold was increased from 80.90% under the conventional flotation process to 83.96%.

Key words:  grinding and classification, overgrinding, monomeric dissociation, flash flotation, plateau area, Qinghai Province

中图分类号: 

  • TD953

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