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<p>Heap leaching with cyanide solutions is widely employed for the processing of low-grade gold ores. However, low dissolved oxygen concentration, along with the chemical and mineralogical characteristics of the ores, often limits gold recovery. In this study, the influence of hydrogen peroxide and sodium acetate additives on the efficiency of gold cyanidation was evaluated. A gold-bearing ore with a grade of 1.32&#xa0;g/t was selected for investigation. Gold was predominantly present as free fine particles. Laboratory-scale tests (bottle roll tests on milled ore) and pilot-scale column leaching tests (on crushed ore) were conducted. Pretreatment of the milled ore with hydrogen peroxide at concentrations of 0.2–1% prior to cyanidation increased gold recovery by approximately 4%. Pilot-scale tests demonstrated an enhancement in gold recovery of up to 10% following hydrogen peroxide treatment. Furthermore, the addition of sodium acetate at dosages of 0.5–1&#xa0;kg/t resulted in additional improvements, with gold recovery increasing by up to 7% in laboratory tests and up to 14% in pilot-scale tests.</p>

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Influence of Hydrogen Peroxide and Sodium Acetate on Gold Cyanidation: Laboratory and Pilot-Scale Tests

  • 期刊论文

  • 发表日期：

    2026年1月22日

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  • Bauyrzhan Surimbayev,
  • Yerlan Yessengarayev,
  • Yerassyl Khumarbekuly,
  • Lyudmila Bolotova,
  • Yernazar Kanaly,
  • Shyngys Zhumabai,
  • Mukhitdin Akzharkenov

摘要

Heap leaching with cyanide solutions is widely employed for the processing of low-grade gold ores. However, low dissolved oxygen concentration, along with the chemical and mineralogical characteristics of the ores, often limits gold recovery. In this study, the influence of hydrogen peroxide and sodium acetate additives on the efficiency of gold cyanidation was evaluated. A gold-bearing ore with a grade of 1.32 g/t was selected for investigation. Gold was predominantly present as free fine particles. Laboratory-scale tests (bottle roll tests on milled ore) and pilot-scale column leaching tests (on crushed ore) were conducted. Pretreatment of the milled ore with hydrogen peroxide at concentrations of 0.2–1% prior to cyanidation increased gold recovery by approximately 4%. Pilot-scale tests demonstrated an enhancement in gold recovery of up to 10% following hydrogen peroxide treatment. Furthermore, the addition of sodium acetate at dosages of 0.5–1 kg/t resulted in additional improvements, with gold recovery increasing by up to 7% in laboratory tests and up to 14% in pilot-scale tests.