山西某含金铅锌硫化矿石选矿试验

金属矿山 ›› 2018, Vol. 47 ›› Issue (11): 81-85.

山西某含金铅锌硫化矿石选矿试验

魏转花^1,2，李国尧^1,2，陈水波^1,2

1. 低品位难处理黄金资源综合利用国家重点实验室，福建龙岩 364200；2. 厦门紫金矿冶技术有限公司，福建厦门 361101

出版日期:2018-11-15 发布日期:2018-12-19

Experiment on Mineral Processing of an Au-bearing Pb-Zn Sulphide Ore in Shanxi

Wei Zhuanhua^1,2，Li Guoyao^1,2，Chen Shuibo^1,2

1. State Key Laboratory of Comprehensive Utilization of Low-Grade Refractory Gold Resources，Longyan 364200，China；2. Xiamen Zijin Mining & Metallurgy Technology Co.，Ltd.， Xiamen 361101，China

Online:2018-11-15 Published:2018-12-19

摘要/Abstract

摘要： 山西某含金多金属硫化矿石中的主要金属矿物为银金矿、黄铁矿，其次为闪锌矿、方铅矿，黄铜矿等少量；脉石矿物主要为石英，其次为钾长石、绢云母等。金主要以银金矿独立矿物的形式存在，银主要以含银硫化物形式存在，铅主要以方铅矿形式存在，锌主要以闪锌矿形式存在，黄铁矿作为金、银的主要载体矿物之一，其粒度较粗。现场采用碱性环境下优先混浮金铅，再浮选锌的流程回收金、银、铅、锌，不仅金回收率较低，且铅、锌精矿互含严重。为确定该矿石的高效、合理选矿工艺进行了选矿试验。结果表明，矿石在磨矿细度为-0.074 mm占65%的情况下，采用尼尔森选矿机重选选金，重选尾矿偏碱性环境下1粗1精1扫金铅混浮，金铅混合精矿1次浮选分离，混浮尾矿1粗2精1扫浮选选锌，中矿顺序返回流程处理，最终获得金品位为264.53 g/t、含银1 042.50 g/t、金回收率为49.67%、银回收率为5.67%的重选砂金，金品位为42.35 g/t、含银998.36 g/t、含铅21.31%、金回收率为24.78%、银回收率为16.93%、铅回收率为23.61%的浮选金精矿，铅品位为59.61%、含金23.10%、含银3 745.20 g/t、铅回收率为63.08%、金回收率为12.91%、银回收率为60.68%的铅精矿，以及锌品位为46.35%、锌回收率为88.21%的锌精矿，较好地实现了金、铅、锌、银的分离与回收。浮选前增设尼尔森选矿机回收金和更弱的碱性环境、更高效的锌矿物抑制剂TQ11是实现金高效回收、解决铅锌精矿互含问题的关键。

关键词: 含金多金属硫化矿石, 尼尔森选矿机重选, 金铅混合浮选, 锌抑制剂TQ11

Abstract: A gold-bearing polymetallic sulfide ore was found in Shanxi. The main metallic minerals are electrum， pyrite， followed by sphalerite and galena， a little chalcopyrite， etc. The main gangue minerals are quartz， followed by potassium feldspar， sericite， etc. Electrum is the most important gold mineral， silver-bearing sulfide ore is the most important silver mineral， galena is the most important lead mineral， sphalerite is the most important zinc mineral. The main gold and silver carrier mineral is pyrite， which dissemination size is coarse. Gold， silver， lead and zinc resources was recovered by the on-site process of primary flotation process of gold-lead bulk in alkaline environment， and then zinc flotation. The recovery of gold was low， and the mutual content of lead and zinc concentrate is serious. In order to determine the efficient and reasonable development technology of the ore， beneficiation experiment was conducted. Results show that the ore at the grinding fineness of -0.074 mm accounting 65%，by the process of gold gravity separation via Nielsen concentrator， in weakly alkaline environment gold-lead bulk flotation from gravity tailings with one-roughing， one-cleaning and one-scavenging， gold-lead mixed concentrate separation with one-flotation， zinc flotation from gold-lead bulk flotation tailings with one-roughing， tow-cleaning and one scavenging， and the middlings back to the flowsheet in turn. Gold concentrate by gravity with gold grade of 264.53 g/t， silver grade of 1 042.50 g/t， gold recovery of 49.67%， silver recovery of 5.67%； gold concentrate by flotation with gold grade of 42.35 g/t， silver grade of 998.36 g/t， lead grade of 21.31%， gold recovery of 24.78%， silver recovery of 16.93%， lead recovery of 23.61%； lead concentrate by flotation with lead grade of 59.61%， gold grade of 23.10 g/t， silver grade of 3 745.20 g/t， lead recovery of 63.08%， gold recovery of 12.91%，silver recovery of 60.68%； zinc concentrate with zinc grade of 46.35%， zinc recovery of 88.21% was finally obtained. The process effectively recovered gold， lead， zinc and silver resources in the ore， and realized separation from each other. Addition of Nielsen concentrator for recovered gold in front of flotation， weaker alkaline environment and more efficient zinc mineral inhibitor TQ11 are the key to realize the high efficiency recovery of gold and solve the problem of lead and zinc concentrate mutual inclusion.

Key words: Gold-bearing polymetallic sulphide ore, Gravity of Knelson concentrator, Gold-lead bulk flotation, Zinc inhibitor TQ11

魏转花, 李国尧, 陈水波. 山西某含金铅锌硫化矿石选矿试验[J]. 金属矿山, 2018, 47(11): 81-85.

WEI Zhuan-Hua, LI Guo-Yao, CHEN Shui-Bo. Experiment on Mineral Processing of an Au-bearing Pb-Zn Sulphide Ore in Shanxi[J]. Metal Mine, 2018, 47(11): 81-85.