The ultrasound leaching kinetics of gold in the thiosulfate leaching process catalysed by cobalt ammonia

Gui, Qihao; Khan, Muhammad Ibrar; Wang, Shixing; Zhang, Libo

doi:10.1016/j.hydromet.2020.105426

Cited by 39 publications

(15 citation statements)

References 22 publications

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“…And according to the research of John et al, when dealing with landfilled metallurgical residues, ultrasonic treatment was able to achieve selective leaching of Pb. In their study, ultrasonic energy increased the leaching rate of Pb while had little effect on Ca dissolution [19] . Notably, ultrasonic technology had also made progress in the field of minerals and coal beneficiation recently, especially in pretreatment process before flotation [20] , [21] , [22] , [23] , [24] .…”

Section: Introductionmentioning

confidence: 91%

Ultrasonic pretreatment of spodumene with different size fractions and its influence on flotation

Chu

Chen

et al. 2022

Ultrasonics Sonochemistry

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The potential of ultrasonic pretreatment enhancing selective surface dissolution to improve the floatability of spodumene with different size fractions was verified and investigated. For coarse particles of −0.15 + 0.0385 mm, compared with traditional pretreatment methods, ultrasonic pretreatment could optimize the physicochemical properties of the surface, markedly increased the amount of NaOL adsorbed on the mineral surface, and improved the floatability of the spodumene. For fine particles of −0.0385 mm, both pretreatment methods (Ultrasonic and Traditional) could greatly increase the flotation recovery, but ultrasonic pretreatment had no obvious advantage compared with traditional method. ICP combined with XPS analysis were conducted to investigate the dissolution mechanism of spodumene surface in different pretreatment system. Si species on the surface of coarse particles were easily dissolved into the solution under the effect of ultrasound, which increases the relative content of Al and Li species on the surface. This was conducive to the adsorption of the collectors on the surface. However, the selective dissolution of the fine particle surface was weakened by excessive energy intake in the ultrasonic system, which neutralized the advantage brought by the large amount of dissolution, making the results obtained by the two preprocessing methods the same.

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Section: Introductionmentioning

confidence: 91%

Ultrasonic pretreatment of spodumene with different size fractions and its influence on flotation

Chu

Chen

et al. 2022

Ultrasonics Sonochemistry

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“…Moreover, Gui et al used ultrasound to enhance the kinetics of gold leaching in cobalt-ammonia-thiosulfate solutions. The gold leaching efficiency significantly increased from 70% to 89% with the assistance of ultrasound [46]. It is expected that biological oxidation is a promising route for treating complex sulfide ores because it is cheap and eco-friendly.…”

Section: Introductionmentioning

confidence: 99%

Leaching of Gold and Silver from a Complex Sulfide Concentrate in Copper-Tartrate-Thiosulfate Solutions

Chen

Xie

Wang

et al. 2022

Metals

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The leaching behaviors of gold and silver from a complex sulfide concentrate in copper-tartrate-thiosulfate solutions were investigated in this paper. Experimental parameters, including temperature, initial pulp pH, and concentration of copper, tartrate, and thiosulfate, were systematically studied. The copper-tartrate-thiosulfate leaching system exhibits promising performance in dealing with the complex sulfide concentrate. Thiosulfate consumption could be greatly reduced due to the in-situ generation of thiosulfate derived from sulfur or disulfide ions. Increasing the temperature and concentrations of copper, tartrate, and thiosulfate can promote gold leaching. A low tartrate content and a moderate increase in temperature and copper and thiosulfate concentrations can accelerate silver leaching, but a higher temperature or copper content may depress silver extraction. A suitable pulp pH is critical for gold and silver leaching in copper-tartrate-thiosulfate solutions. An extraction of 74.50% Au and 36.33% Ag was obtained with the direct leaching of the concentrate, while the percentages can be significantly increased up to 82.60% and 70.38%, respectively, when leaching the calcine following the oxidative roasting pretreatment. The recycling of leaching solutions demonstrates that a suitable free tartrate content is of great significance in maintaining the stability of the novel system. As an alternative to the traditional cyanide or copper-ammonia-thiosulfate leaching processes, the copper-tartrate-thiosulfate leaching system provides an environmentally friendly, nontoxic, and relatively low-cost method for gold and silver leaching from ores or concentrates.

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“…When the reaction is controlled by internal diffusion [ 31 , 32 , 33 , 34 ], the equation is expressed as follows.

…”

Section: Resultsmentioning

confidence: 99%

The Leaching Kinetics of Iron from Titanium Gypsum in a Citric Acid Medium and Obtain Materials by Leaching Liquid

et al. 2023

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In this study, the effect of citric acid on iron leaching from titanium gypsum (TiG) was systematically investigated. The conditions for the leaching of valuable metals were optimized while varying such parameters as the leaching time, citric acid mass fraction, leaching temperature, and the liquid–solid ratio. It was found that under the conditions of a citric acid mass fraction of 10%, at a 80 °C leaching temperature, a leaching duration of 80–90 min and a liquid–solid ratio of 8, the whiteness of titanium gypsum (TiG) increased from 8.1 to 36.5, and the leaching efficiencies of iron reached 84.37%. The kinetic analysis indicated that the leaching process of iron from TiG was controlled by the reaction product layer from 0–20 min, while the leaching process of iron from TiG was controlled by internal diffusion from 20–90 min. The apparent activation energy of the leaching reactions was 33.91 kJ/mol and 16.59 kJ/mol, respectively. High-value-added calcium oxalate and ferrous oxalate were prepared from the calcium and iron in the filtrate of the oxalic acid extraction. The leaching liquid could be recycled, which will provide a new way to utilize titanium gypsum.

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The ultrasound leaching kinetics of gold in the thiosulfate leaching process catalysed by cobalt ammonia

Cited by 39 publications

References 22 publications

Ultrasonic pretreatment of spodumene with different size fractions and its influence on flotation

Ultrasonic pretreatment of spodumene with different size fractions and its influence on flotation

Leaching of Gold and Silver from a Complex Sulfide Concentrate in Copper-Tartrate-Thiosulfate Solutions

The Leaching Kinetics of Iron from Titanium Gypsum in a Citric Acid Medium and Obtain Materials by Leaching Liquid

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