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  • CN 62-1112/TF 
  • ISSN 1005-2518 
  • Founded in 1988
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Mining Technology and Mine Management

Process Mineralogy of a Gold-bearing Primary Ore

  • Wenping ZHANG ,
  • Mingming CAI ,
  • Chao XU
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  • Metallurgical Laboratory Branch of Shandong Gold Mining Technology Co. ,Ltd. ,Yantai 261441,Shandong,China

Received date: 2018-08-19

  Revised date: 2019-03-14

  Online published: 2019-11-07

Abstract

The gold grade of a gold-bearing primary ore is 5.36×10-6.Through analysis,it is known that gold is the main recovery target.Because the process mineralogy information such as the type and content of gold-bearing minerals in the primary ore and the embedded state of target elements are not fully grasped, it is impossible to optimize and adjust the production process accurately and effectively.In order to deeply explore the distribution characteristics of target minerals in the primary ore and further find out the process mineralogical factors affecting the processing and metallurgical indexes,the process mineralogical characteristics of the ore was fully studied, such as the types and contents of gold-bearing minerals, the occurrence state and distribution characteristics of target minerals and elements.Based on the scanning electron microscopy (obtaining the backscatter electron image of minerals),an automatic mineral analyzer consisting of X-ray energy spectrometer (acquiring chemical composition information of minerals) and BPMA analysis software (combining image and composition information of minerals with data in mineral database,and statistic process mineralogical parameters of minerals in samples) was developed by Beijing Institute of Mining and Metallurgical Research.The system consists of eight modules as followed:measurement module,building small reservoir module,mineral matching module,mineral processing module,Block template supplement module,process mineralogy parameter calculation module,database editing module and auxiliary function module.The mineral composition,mineral distribution characteristics,occurrence state of gold,particle size of gold-bearing minerals and dissociation degree of gold-bearing minerals were systematically studied,and the relevant process mineralogy parameters of target minerals were obtained.The results show that the main gold minerals in the primary ore are natural gold and silver goldmine,as well as pyrite,magnetite,arsenopyrite,pyrrhotite and other metal minerals.The gangue minerals are mainly calcite,quartz,mica,dolomite and a small or trace amount of apatite, kaolinite and talc.The particle size of gold in the ore is mainly fine gold and fine gold,accounting for 49.43% and 50.57% respectively.The main embedding state of gold minerals is bare gold, accounting for 72.71% and encapsulated gold for 27.29%.The results show that increasing grinding fineness and exposing wrapped gold are helpful to improve gold recovery.At the same time, before leaching, some measures are adopted to oxidize arsenopyrite to remove its adverse effects in gold leaching process.

Cite this article

Wenping ZHANG , Mingming CAI , Chao XU . Process Mineralogy of a Gold-bearing Primary Ore[J]. Gold Science and Technology, 2019 , 27(5) : 770 -776 . DOI: 10.11872/j.issn.1005-2518.2019.05.770

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