Oxidative pretreatment of refractory gold ore using persulfate under ultrasound for efficient leaching of gold by a novel eco-friendly lixiviant: Demonstration of the effect of particle size and economic benefits

Gui, Qihao; Fu, Longsheng; Hu, Yuting; Di, Haokai; Liang, Ming; Wang, Shixing; Zhang, Libo; Dong, Enhua

doi:10.1016/j.hydromet.2023.106110

Cited by 5 publications

(1 citation statement)

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“…Ultrasound technology shows great potential application in metal leaching and recovery due to its unique mechanical vibration and cavitation effects. Ultrasonic is widely used in the recovery process of Zn [8,19,20], Pb [21], Cd [22], Ge [23][24][25], In [26,27], Ag [28], Cu [29,30], Mg [31], Rb [32], Au [33], Ga [20,25], etc., and relevant studies have shown that ultrasound has significant effects in terms of improving the reaction speed and metal extraction rate. Xin et al [12] studied the extraction of zinc and germanium from Gecontaining slag via ultrasound combined with oxygen leaching.…”

Section: Introductionmentioning

confidence: 99%

Mechanism Analysis and Experimental Research on Leaching Zn from Zinc Oxide Dust with an Ultrasound-Enhanced NH3-NH4Cl-H2O System

Ma,

Li,

Chang

et al. 2024

Sustainability

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Zinc oxide dust (ZOD) is an industrial solid waste produced in the production process of wet smelting Zn, with large output and great pollution to the environment. The recycling of metallurgical solid waste such as zinc oxide dust is very important to achieve the sustainable development of the circular economy. An experimental study of zinc (Zn) leaching from zinc oxide dust using an ultrasound-enhanced ammonia–ammonium chloride system was performed. The effects of ultrasonic power, leaching time, total ammonia concentration, and other factors on the leaching rate of zinc from zinc oxide dust were investigated. The results revealed that the leaching rate of Zn reached up to 80.70% under the condition of ultrasound power of 1000 W, reaction time of 15 min, total ammonia concentration of 6 mol/L, [NH3]:[NH4+] of 1:1, L/S of 5:1, temperature of 45 °C, and stirring speed of 100 r/min. The conventional leaching was conducted under similar conditions, except that the time was controlled to 40 min and the zinc leaching rate was 71.15%. The leaching rate of Zn in the ultrasound condition was improved by 9.55% compared with that in the conventional leaching process. XRD, laser particle size, and SEM-EDS analyses were conducted to study the leaching residues of ZOD. The analysis results showed that in the ultrasound condition, the largest leaching rate of soluble ZnO phases was achieved after 15 min of leaching. Under the ammoniacal system, it was difficult to leach ZnFe2O4, Zn2SiO4, and ZnS phases, which partly accounted for the low zinc leaching rate. Additionally, through ultrasound-enhanced treatment, the ZnO particles encapsulated in ZOD particles were broken into smaller sizes and exposed to the leaching solution. Thus, the leaching rate of Zn was improved. The experimental results show that ultrasound can tremendously improve the effect of Zn extraction from ZOD, shorten reaction time, and help reduce energy consumption and environmental pollution, making it a promising application in the treatment of secondary Zn resources.

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