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Дата издания
21.10.2025Область исследования
Тип исследования
Аннотация (краткое описание)
Cyanide-containing effluents from hydrometallurgical gold extraction pose significant environmental risks due to their high toxicity. This study investigates the detoxification of cyanide-laden tailings from the Altyntau Kokshetau gold extraction facility (Kazakhstan) using sodium percarbonate in alkaline conditions. Employing response surface methodology (RSM) and central composite design (CCD), we optimized key parameters—pH (10–12), sodium percarbonate dosage (1.5–4.0 g), reaction time (10–40 min) and temperature (20–25 °C)—achieving 83.33% detoxification efficiency within 40 min and 99.99% after 8 h, reducing cyanide from 443.2 mg/L to 0.05 mg/L. The process follows biphasic pseudo-first-order kinetics ((k1 = 0.0517) min–1 initially, (k2 = 0.01665) min–1 subsequently), driven by HO• radical-mediated oxidation of (Formula presented.) to (Formula presented.), as described by (Formula presented.)). pH emerged as the dominant factor, optimizing radical stability and (Formula presented.) protonation (pKa ≈ 9.21) at pH 10. Infrared spectroscopy confirmed the presence of cyanide complexes ((Formula presented.), (Formula presented.)) in tailings, underscoring the need for effective treatment. The method ensures compliance with stringent environmental standards (e.g., ICMI limit of 0.2 mg/L), offering a scalable, eco-efficient solution for mitigating the environmental footprint of gold mining operations. © 2025 by the authors.DOI
10.3390/met15101162Тип публикаций
Сведения о финансировании
This research is funded by the Science Committee of the Ministry of Science and Higher Education of the Republic of Kazakhstan (Grant \u2116 AR 23488663).Дата подачи заявки
01.01.1970Данный документ располагается в коллекциях
Международные публикации ученых SU
Scopus