Influence of Hydrogen Peroxide and Sodium Acetate on Gold Cyanidation: Laboratory and Pilot-Scale Tests
Surimbayev B. Yessengarayev Y. Khumarbekuly Y. Bolotova L. Kanaly Y. Zhumabai S. Akzharkenov M.
2026Springer Science and Business Media Deutschland GmbH
Mining, Metallurgy and Exploration
2026
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.
Gold leaching , Gold ore , Heap leaching , Hydrogen peroxide , Sodium acetate
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Laboratory of Precious Metals, Kazmekhanobr State Scientific Production Association of Industrial Ecology, 67 Zhandosov St, Almaty, 050036, Kazakhstan
Department of Metallurgy and Mineral Processing, Satbayev University, 22 Satpayev St, Almaty, 050013, Kazakhstan
School of Material Science and Green Technology, Kazakh-British Technical University, 59 Tole Bi St, Almaty, 050000, Kazakhstan
Laboratory of Precious Metals
Department of Metallurgy and Mineral Processing
School of Material Science and Green Technology
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