Atmospheric oxidation of pyrite with a novel catalyst and ultra-high elemental sulphur yield

Cowan, Denver H.; Jahromi, Fazel G.; Ghahreman, Ahmad

doi:10.1016/j.hydromet.2017.07.003

Cited by 13 publications

(9 citation statements)

References 11 publications

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“…Water-treated (fresh) and pre-treated AF 5 was used in the oxidative enargite leach tests to evaluate the impact of the pre-treatment process on the catalyst effectiveness by measuring the efficiency of the leach process. Examples of leach processes with AF 5 catalyst have been published before [1,2].…”

Section: Methodsmentioning

confidence: 99%

“…Carbon-based catalysts (CBCs), such as activated carbon (AC) and AF 5, are porous catalysts with high surface area and high chemical resistance. One of the important properties of the CBC is their oxidative properties in the presence of oxygen, making the CBC an efficient catalyst in the hydrometallurgical research [1,2]. Recently, AF 5 has been employed in hydrometallurgy leach processes to catalyze the oxidative leaching of refractory sulfide minerals such as enargite and pyrite [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…One of the important properties of the CBC is their oxidative properties in the presence of oxygen, making the CBC an efficient catalyst in the hydrometallurgical research [1,2]. Recently, AF 5 has been employed in hydrometallurgy leach processes to catalyze the oxidative leaching of refractory sulfide minerals such as enargite and pyrite [1,2]. The application of CBC during the enargite (Cu 3 AsS 4 ) leaching process in chloride media has shown and improved copper extraction from 69% (no AF 5) to 92% (with AF 5) in 96 h [1].…”

Section: Introductionmentioning

confidence: 99%

“…The application of CBC during the enargite (Cu 3 AsS 4 ) leaching process in chloride media has shown and improved copper extraction from 69% (no AF 5) to 92% (with AF 5) in 96 h [1]. A product of enargite leaching process with AF 5 is elemental sulfur, which interestingly AF 5 is capable of adsorbing the elemental sulfur on its surface, which is referred to as sulfur collection process [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…The mechanism associated with the sulfur fixation is proposed to be through capillary condensation, adsorption, chemisorption, and solution in structure [10][11][12][13][14][15]. The CBC can be used to catalyze oxidative reactions such as the oxidative leaching of refractory sulfide minerals [1,2]. Ahumada et al (2002) have shown that some CBC can produce in-situ H 2 O 2 and HO 2 − in the presence of oxygen and water, and this phenomenon can be explained by the availability of chromene and quinone groups on the surface of the catalyst, as shown in Reactions (1) and (2) [16].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Surface Modification with Different Acids on the Functional Groups of AF 5 Catalyst and Its Catalytic Effect on the Atmospheric Leaching of Enargite

Jahromi

Ghahreman

2019

Colloids and Interfaces

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Carbon-based catalysts can assist the oxidative leaching of sulfide minerals. Recently, we presented that AF 5 Lewatit® is among the catalysts with superior enargite oxidation capacity and capability to collect elemental sulfur on its surface. Herein, the effect of acid pre-treatment of the AF 5 catalyst was studied on the AF 5 surface, to further enhance the catalytic properties of AF 5. The AF 5 catalyst was pretreated by hydrochloric acid, nitric acid and sulfuric acid. The results showed that the acid treatment drastically changes the surface properties of AF 5. For instance, the concentration of quinone-like functional groups, which are ascribed to the catalytic properties of AF 5, is 45.4% in the sulfuric acid pre-treatment AF 5 and only 29.8% in the hydrochloric acid-treated AF 5. Based on the C 1s X-ray photoelectron spectroscopy (XPS) results the oxygenated carbon is 30.6% in the sulfuric acid-treated AF 5, 29.2% in the nitric acid-treated AF 5 and 28.3% in the hydrochloric acid-treated AF 5. The nitric acid pre-treated AF 5 resulted in the highest copper recovery during the oxidative enargite leaching process, recovering 98.8% of the copper. The sulfuric acid-treated AF 5 recovered 97.1% of the enargite copper into the leach solution. Among different leaching media and pre-treatment the lowest copper recovery was achieved with the HCl pre-treated AF 5 which was 88.6%. The pre-treatment of AF 5 with acids also had modified its elemental sulfur adsorption capacity, where the sulfur adsorption on AF 5 was increased from 30.9% for the HCl treated AF 5 to 51.1% for the sulfuric acid-treated AF 5.

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Section: Methodsmentioning

confidence: 99%