Investigation of gold leaching from urban mineral resources via ultrasonic enhancement of thiocyanate-hydrogen peroxide system

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology Pub Date : 2025-04-16 DOI:10.1016/j.seppur.2025.133076

Yan Lu, Jianbo Wang, Zizhen He

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引用次数: 0

Abstract

Thiocyanate (SCN^-) serves as a viable substitute for cyanide in gold extraction, exhibiting toxicity that is 1000 times lower than that of cyanide. This study investigates a rapid ultrasonic-enhanced leaching technique for gold leaching via thiocyanate and hydrogen peroxide system. The leaching behaviors of gold in the thiocyanate solution under various conditions were also evaluated. The results indicated that the redox potential fluctuates between 0.53 to 0.74 V, with a pH value below 4.9, and the SCN^- concentration varies from 0.08 to 0.38 mol/L, the hydrogen peroxide volume exceeds 0.75 mL, the temperature is maintained at 40 ℃, and solid–liquid ratio of 200/25 tablets /mL. Consequently, 94.65 % of gold was leached and the gold complex present in the system are

Au {(S C N)}^{2 -}

and

{Au (S C N)}^{4 -}

. The results presented in this paper establishes a theoretical foundation for the extraction of gold by the thiocyanate method and promoted the development of thiocyanate technology.

Abstract Image

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来源期刊

Separation and Purification Technology 工程技术-工程：化工

CiteScore

14.00

自引率

12.80%

发文量

2347

审稿时长

43 days

期刊介绍： Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.