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Experimental study on the process mineralogy and beneficiation of a gold ore

  • English Author:
  • Guo Yanhua¹,², Bai Yalin¹, Yang Junlong¹, Wang Zhifeng1

  • Unit:
  • (1. Northwest Research Institute of Mining and Metallurgy; 2. Institute of Process Engineering, Chinese Academy of Sciences)
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Abstract:

To fully understand the characteristics of a certain gold ore and develop an appropriate beneficiation scheme, a systematic process mineralogical study was conducted using chemical analysis, polarized light mieroscopy. manual panning, and electron probe techniques. The results showed that the valuable element in the ore is gold, with a grade of 4.08 g/t. The metallic minerals are mainly pyrite, colloform pyrite, marcasite, and arsenopyrite, while the non-metallic mineral is mainly quartz. Gold occurs mainly as native gold, predominantly in the form of inclusion gold. followed by intergranular gold and fissure gold; it is closely associated with pyrite, and to a lesser extent with gangue minerals. Most of the gold particles are smaller than 0.037 mm, classifying the ore as a microfine-grained disseminated gold ore. Based on the results of the process mineralogical study, 2 flotation schemes were developed. A comparison showed that the scheme involving coarse grinding of the raw ore followed by regrinding of the roughing concentrate performed better than one-stage fine grinding of the raw ore. The closed-circuit test produced gold concentrate with a grade of 43.39 g/t and a gold recovery rate of 95.08%.


Keywords:

microfine‑grained disseminated gold ore; inclusion gold; process mineralogy; occurrence state; monomer dissociation; regrinding of roughing concentrate