An environmentally friendly method for efficient atmospheric oxidation of pyrrhotite in arsenopyrite/pyrite calcine

Li, Lin; Wang, Jingxiu; Wu, Chengqian; Ghahreman, Ahmad

doi:10.1016/j.ceja.2021.100122

Cited by 4 publications

(1 citation statement)

References 30 publications

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“…Based on the previously discussed kinetic mechanism analysis and phase analysis results of combustion products, the combustion process of the pyrite-pyrrhotite mixture in the air was dominated by pyrite and accompanied by the surface heterogeneous combustion of pyrrhotite [53,54], as shown in Figure 7. Pyrrhotite particles were more easily adsorbed on the surface of pyrite particles during mixed mineral combustion due to their strong ability to absorb oxygen [44], which accelerated pyrite combustion.…”

Section: Analysis Of the Combustion Kinetic Mechanism Of Ironmentioning

confidence: 94%

Effects of Pyrrhotite on the Combustion Behavior and the Kinetic Mechanism of Pyrite-Pyrrhotite Mixture Powders in the Air

Tian

Rao

et al. 2023

International Journal of Chemical Engineering

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In this study, we performed a comparative analysis of the combustion behavior of pyrite, pyrrhotite, and pyrite-pyrrhotite mixture (mixed mineral) powders in an air atmosphere. To study the influence of the pyrrhotite content in mixed mineral powders on the combustion behavior in the air, thermogravimetric mass spectrometry, X-ray diffraction analysis, and scanning electron microscopy were employed. The results indicated that pyrrhotite lead to a weight gain in the mixed minerals during the combustion process. Pyrrhotite particles are more easily adsorbed on the surface of pyrite particles during mixed mineral combustion due to their strong ability to absorb oxygen, which accelerates pyrite combustion. The weight loss of mixed minerals decreased during the combustion process with increasing pyrrhotite content, resulting from pyrite encapsulation by agglomerated and sintered pyrrhotite during combustion. The calculated kinetic parameters and phase analysis results suggested that pyrite combustion is consistent with the shrinking core mechanism, and in the combustion process, the irregular pyrite particle shrank into a spherical particle; the combustion products of pyrrhotite grew in a layer-by-layer manner. Pyrrhotite combustion corresponded to the three-dimensional diffusion mechanism, and mixed mineral combustion was dominated by the shrinking core mechanism and supplemented by the three-dimensional diffusion mechanism. SO2, as the main combustion product, was continuously generated and volatilized in the reaction, signifying that the combustion reaction of pyrite is a two-phase reaction involving gas and solid.

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Section: Analysis Of the Combustion Kinetic Mechanism Of Ironmentioning

confidence: 94%

Effects of Pyrrhotite on the Combustion Behavior and the Kinetic Mechanism of Pyrite-Pyrrhotite Mixture Powders in the Air

Tian

Rao

et al. 2023

International Journal of Chemical Engineering

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A comprehensive investigation of the continuous oxidation of pyrrhotite by micromolar hydrogen peroxide in near neutral and acidic solutions

Ma,

Yang,

Liu

et al. 2024

Journal of Environmental Sciences

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Effect of roasting parameters on arsenic removal from copper smelting dust

Mamyachenkov,

Bludova,

Khanzhin

2024

jour

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In this study, we develop a roasting method for removing arsenic from sulfide copper-arsenic-containing materials. The object of the study was fine dust from copper smelting production of the following composition (wt%): 34.89 – Zn; 20.02 – Cu; 17.74 – Pb; 17.07 – Fe; 7.12 – As; 0.92 – Sb; 0.69 – Sn; 0.63 – Ca; 0.42 – Mo; and 0.34 – K. The chemical composition of the materials was analyzed using an SHIMADZU EDX-7000 energy dispersive X-ray fluorescence spectrometer and a Bruker D8 Advance diffractometer. The roasting process was carried out in a laboratory tube furnace at a temperature of 550–800°C for 60–120 minutes with the addition of 25–50% of FeS2 to the charge. Optimal conditions for reducing residual arsenic in the calcine to less than 0.3 wt% were identified: a temperature of 750–800°C, a duration of 1.5–2.0 h (in an inert atmosphere), and the use of 30 wt% of pyrite concentrate in the charge. Arsenic removal to the gas phase reached 91–96%. It is shown that in order to reduce the processing temperature to 600°C, it is necessary to add a reducing agent (coke fines) to the mixture of copper smelting dust with pyrite or increase the proportion of pyrite in the test charge to 50 wt% and hold the mixture for 1.5–2.0 h under inert atmosphere (argon and nitrogen) or low-oxygen blast. Arsenic removal to the gas phase reached 97%. X-ray spectral analysis of the residue deposited on the cooled ends of quartz tubes following the release of gases formed during roasting revealed that this material is predominantly (up to 93%) composed of arsenic. The resulting calcine contained 94 wt% of iron, zinc, copper and lead compounds. Therefore, the calcine obtained during the roasting of fine dust from copper smelting production is suitable for returning to the copper production process.

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An environmentally friendly method for efficient atmospheric oxidation of pyrrhotite in arsenopyrite/pyrite calcine

Cited by 4 publications

References 30 publications

Effects of Pyrrhotite on the Combustion Behavior and the Kinetic Mechanism of Pyrite-Pyrrhotite Mixture Powders in the Air

Effects of Pyrrhotite on the Combustion Behavior and the Kinetic Mechanism of Pyrite-Pyrrhotite Mixture Powders in the Air

A comprehensive investigation of the continuous oxidation of pyrrhotite by micromolar hydrogen peroxide in near neutral and acidic solutions

Effect of roasting parameters on arsenic removal from copper smelting dust

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