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<p>Improvements in the flotation of copper, gold, and silver bearing minerals has become increasingly important due to the rapidly growing demands and depleting grades and reserves of ore bodies. This paper investigates the improved flotation of five different Troilus Gold low-grade copper, gold, and silver ores using Eriez’ column/StackCell® high-intensity flotation technologies. Various depressants were used to decrease the final concentrate contents of sphalerite (ZnS), arsenopyrite (FeAsS) and galena (PbS) to acceptable levels to prevent a penalty when processing the final concentrate. Due to the ultrafine Cu-Au–Ag dissemination and associated grinding requirements of the flotation feed, Eriez’ column/StackCell and Denver benchtop cells were utilized to optimize their respective flotation responses. Enhanced flotation results were achieved using flotation&#xa0;column and StackCell technologies. Collectors of KAX 51, SPRI 206, Aero 3477, and Hostaflot 7257, and depressants of CaO, Na<sub>2</sub>CO<sub>3</sub>, Na<sub>2</sub>SO<sub>3</sub>, tri-thiocarbonate, sodium polyacrylate (C3H<sub>3</sub>NaO<sub>2</sub>)n, and ZnSO<sub>4</sub> were employed. In column/StackCell flotation of five main mineral deposit ore composites (J-zone, SW-zone, 87-zone, X22-1, and X22-2) with various Au, Cu, Ag, Fe, Zn, As, and Pb contents, the rougher-scavenger-cleaner circuit Cu, Au, and Ag flotation recoveries were 90.4 ~ 95.8% at the concentrate copper grade of 13.6–17.4% and feed copper grade of 0.024–0.070%, 87.5–95.1% at the concentrate gold grade of 65.6–214.7&#xa0;g/t and feed gold grade of 0.32–0.62&#xa0;g/t, and 80.7–91.8% at the concentrate silver grade of 62.6–279.7&#xa0;g/t and the feed silver grade of 0.26–1.12&#xa0;g/t, respectively. The benefits of Eriez Column/StackCell® flotation technologies include high flotation selectivity and increased recovery due to unique hydrodynamic designs. Specifically, the StackCell design facilitates high turbulent kinetic energy dissipation rates to improve fine particle recovery and incorporates countercurrent wash water to significantly reduce hydraulic entrainment of the finest size gangue minerals to the froth product.</p>

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Enhanced Flotation of Various Au-Cu-Ag Ores Using Zinc/Arsenic/Pyrite/Lead Depressants and Eriez Column/StackCell® High-Intensity Technologies

  • 期刊论文

  • 发表日期：

    2025年6月13日

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  • Maoming Fan,
  • Joe Milbourne,
  • Andrew Hobert,
  • Ryan Letkiewicz,
  • Rahul Singh,
  • Erich Dohm

摘要

Improvements in the flotation of copper, gold, and silver bearing minerals has become increasingly important due to the rapidly growing demands and depleting grades and reserves of ore bodies. This paper investigates the improved flotation of five different Troilus Gold low-grade copper, gold, and silver ores using Eriez’ column/StackCell® high-intensity flotation technologies. Various depressants were used to decrease the final concentrate contents of sphalerite (ZnS), arsenopyrite (FeAsS) and galena (PbS) to acceptable levels to prevent a penalty when processing the final concentrate. Due to the ultrafine Cu-Au–Ag dissemination and associated grinding requirements of the flotation feed, Eriez’ column/StackCell and Denver benchtop cells were utilized to optimize their respective flotation responses. Enhanced flotation results were achieved using flotation column and StackCell technologies. Collectors of KAX 51, SPRI 206, Aero 3477, and Hostaflot 7257, and depressants of CaO, Na2CO3, Na2SO3, tri-thiocarbonate, sodium polyacrylate (C3H3NaO2)n, and ZnSO4 were employed. In column/StackCell flotation of five main mineral deposit ore composites (J-zone, SW-zone, 87-zone, X22-1, and X22-2) with various Au, Cu, Ag, Fe, Zn, As, and Pb contents, the rougher-scavenger-cleaner circuit Cu, Au, and Ag flotation recoveries were 90.4 ~ 95.8% at the concentrate copper grade of 13.6–17.4% and feed copper grade of 0.024–0.070%, 87.5–95.1% at the concentrate gold grade of 65.6–214.7 g/t and feed gold grade of 0.32–0.62 g/t, and 80.7–91.8% at the concentrate silver grade of 62.6–279.7 g/t and the feed silver grade of 0.26–1.12 g/t, respectively. The benefits of Eriez Column/StackCell® flotation technologies include high flotation selectivity and increased recovery due to unique hydrodynamic designs. Specifically, the StackCell design facilitates high turbulent kinetic energy dissipation rates to improve fine particle recovery and incorporates countercurrent wash water to significantly reduce hydraulic entrainment of the finest size gangue minerals to the froth product.