Ultrasound-assisted cyanide extraction of gold from gold concentrate at low temperature

Yu, Shimin; Yu, Tingting; Song, Wenping; Yu, Xiyang; Qiao, Jianxin; Wang, Wuyi; Dong, Huijuan; Wu, Zhiguang; Dai, Lidong; Li, Tianlong

doi:10.1016/j.ultsonch.2020.105039

Cited by 26 publications

(11 citation statements)

References 45 publications

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“…Figure delineates the hypothesized mechanisms of the novel APE based on the cell model. Extraction resistance concentrated on the membrane and cell wall, and here, the resistance was envisaged to remain stable in the process because the cell was inclined to maintain integrity; , therefore, Ca 2+ and OH – played an important role in adjusting the polyphenol concentration gradient between the cell and solution. The former investigations confirmed that OH – and Ca 2+ would precipitate together with the polyphenols; hence, at the outside of the cell, polyphenol precipitates were presented as the co-precipitates.…”

Section: Resultsmentioning

confidence: 99%

Novel Accelerated Penetration Extraction for Polyphenol Extraction from Pomegranate Skins: Utilization of Fick’s Law

Deng

Zhao

Yang

et al. 2021

ACS Sustainable Chem. Eng.

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Pomegranate was a popular fruit, and the pomegranate skins (PS) contained abundant polyphenols. In this article, a novel method based on Fick’s law, accelerated penetration extraction (APE), was developed for the first time for polyphenol recovery from PS, which aimed at precipitating the polyphenols with Ca2+ in alkaline conditions to elevate the concentration gradient between the cell and solution, thus promoting the further penetration of polyphenols to solution. Under the optimal conditions of 8 mg/mL of CaCl2 and 3 mg/mL of NaOH of APE, the highest polyphenol yield of 113.5 mg GAE/g was obtained, higher than solvent extraction (SE, 92.9 mg GAE/g) by 21.6%. The comparisons of SE and APE were performed, including the polyphenol yields, UV–vis spectra, composition analysis by high-performance liquid chromatography (HPLC), and DPPH-scavenging ability. Results showed that APE was non-selective, almost all kinds of polyphenols could be precipitated by alkaline Ca2+, and the antioxidation of polyphenols could not be affected by APE. In addition, the mechanisms were discussed based on the mass transfer principle. Results indicated that APE was non-selective, efficient, easily operated, and promising in PS disposal and polyphenol extraction. Most importantly, the application of APE exploited the different concept with other methods to enhance the extraction process.

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Section: Resultsmentioning

confidence: 99%

Novel Accelerated Penetration Extraction for Polyphenol Extraction from Pomegranate Skins: Utilization of Fick’s Law

Deng

Zhao

Yang

et al. 2021

ACS Sustainable Chem. Eng.

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“…Ultrasound has wide applications in the recovery of precious metals, such as silver, gold, and platinum group metals from raw metal ores and secondary resources, ascribing to that any effective improvement for the recovery of precious metals can bring significant economic benefits. At present, the recovery of precious metals by ultrasound-assisted technology dominantly focused on refractory gold and silver ores [27] , [54] , [55] , [56] , gold concentrate [20] , [154] , polymetallic sulfide [13] , [28] , and spent automotive catalysts [93] .…”

Section: Applications Of Ultrasound Technology In Metal Leaching Proc...mentioning

confidence: 99%

A comprehensive review on the ultrasound-enhanced leaching recovery of valuable metals: Applications, mechanisms and prospects

Bao,

Chen,

Zhang

et al. 2023

Ultrasonics Sonochemistry

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“…Beberapa keuntungan menggunakan pelarut ini diantaranya adalah persen ekstraksi yang tinggi, kemudahan dalam pengontrolan, investasinya murah dan instalasi yang mudah serta prosesnya yang sudah terbukti efektif [1][2]. Adapun kekurangan pelarut sianida ini adalah kinetika reaksi yang lambat dan potensi masalah lingkungan yang ditimbulkan [3][4][5][6][7]. Sampai saat ini, telah banyak dilakukan riset untuk Studi Ekstraksi Bijih Emas Asal Pesawaran dengan Metode Pelindian Agitasi dalam Larutan Sianida mengganti pelarut sianida ini, diantaranya dengan thiosulfat [8][9][10], iodin [11][12], klorin [13], tiosianat [14] dan alkalin glisin [15].…”

Section: Pendahuluanunclassified

Studi Ekstraksi Bijih Emas Asal Pesawaran dengan Metode Pelindian Agitasi dalam Larutan Sianida

Arham

Mufakhir

Saputra

2020

J. Sci. Appl. Tech.

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Research on the extraction of gold ore from Pesawaran, , Lampung, Indonesia, was carried out using the agitation leaching method in cyanide solution. This study aimed to obtain information on the use of conventional cyanidation methods for extracting gold from the Pesawaran gold ore. The ore preparation was carried out in the form of crushing, grinding and sieving to obtain samples with fraction sizes of -60 + 100 mesh, -100 +150 mesh, -150 + 200 mesh and -200 mesh. The ore characterization was performed using XRD, XRF, SEM-EDX, and wet chemical analysis. The XRD analysis showed that the main mineral phases were silica, hematite, aluminium hydroxide and orthoclase. The major constituents of the ore were Si (53,628%), Fe (15,996%), K (19,744%) and Al (8,045%). The Au content was determined by wet chemical analysis and was found to be 9.67 ppm. The experimental results show that the highest percentage of gold extraction of 83.33% was obtained using sodium cyanide at a concentration of 1000 ppm, a percent solids of 40% and a grain size of 200 mesh. Higher gold extraction was not achieved despite the use of a high cyanide concentration was probably because the remaining gold was not properly liberated. The results of SEM-EDX analysis showed that the gold grain size was <20 µm, while the grinding was performed only to a sieve size of -200 mesh (74 µm).

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Ultrasound-assisted cyanide extraction of gold from gold concentrate at low temperature

Cited by 26 publications

References 45 publications

Novel Accelerated Penetration Extraction for Polyphenol Extraction from Pomegranate Skins: Utilization of Fick’s Law

Novel Accelerated Penetration Extraction for Polyphenol Extraction from Pomegranate Skins: Utilization of Fick’s Law

A comprehensive review on the ultrasound-enhanced leaching recovery of valuable metals: Applications, mechanisms and prospects

Studi Ekstraksi Bijih Emas Asal Pesawaran dengan Metode Pelindian Agitasi dalam Larutan Sianida

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