Pyrogallic acid as depressant for flotation separation of pyrite from chalcopyrite under low-alkalinity conditions
TL;DR: In this article, the effect of pyrogallic acid on the flotation separation of chalcopyrite and pyrite was investigated, and it was shown that pyrogaline acid significantly reduced the amount of sodium butyl xanthate adsorption on the pyritic surface.
About: This article is published in Separation and Purification Technology.The article was published on 2021-07-15. It has received 11 citations till now. The article focuses on the topics: Pyrite & Chalcopyrite.
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TL;DR: In this paper, the thermal decomposition of coal-derived pyrite was studied using thermogravimetry combining with Fourier transform infrared spectroscopy (TG-FTIR) techniques to gain knowledge on the SO2 gas evolution process and formation mechanism.
Abstract: The thermal decomposition of the coal-derived pyrite was studied using thermogravimetry combining with Fourier-transform infrared spectroscopy (TG-FTIR) techniques to gain knowledge on the SO2 gas evolution process and formation mechanism during the thermal decomposition of the coal-derived pyrite. The results showed that the thermal decomposition of the coal-derived pyrite which started at
about 400 ◦C was complete at 600 ◦C; the gas evolved can be established by combining the DTG peak, the Gram–Schmidt curve and in situ FTIR spectroscopic evolved gas analysis. It can be observed from the spectra that the pyrolysis products for the sample mainly vary in quantity, but not in species. It was proposed that the oxidation of the coal-derived pyrite started at about 400 ◦C and that pyrrhotite and hematite were formed as primary products. The SO2 released by the thermal decomposition of the coal-derived
pyrite mainly occurred in the first pyrolysis stage between 410 and 470 ◦C with the maximum rate at 444 ◦C. Furthermore, the SO2 gas evolution and formation mechanism during the thermal decomposition of the coal-derived pyrite has been proposed.
58 citations
TL;DR: In this article , the effect of Fe 2+ on the flotation behavior of smithsonite was investigated, and the interaction mechanism of the Fe 2 + with the smith-sonite surface in the sulfidization flotation system was clarified.
7 citations
TL;DR: In this article , a low-alkaline acid mine drainage (AMD) system was used for selective flotation separation of chalcopyrite and pyrite via Fenton oxidation modification.
6 citations
TL;DR: In this paper , the main chemical and physical mechanisms involved in the phenomena of reagent adsorption on the mineral surface, the impact of pH and type of alkalizing agent, and the effect of pyrite depressants, some already used in the industry and others under investigation are discussed.
Abstract: In the present work an intense bibliographic search is developed, with updated information on the microscopic fundamentals that govern the behavior of flotation operations of chalcopyrite, the main copper mineral in nature. In particular, the effect caused by the presence of pyrite, a non-valuable mineral, but challenging for the operation due to its ability to capture a portion of collector and float, decreasing the quality of the concentrate, is addressed. This manuscript discusses the main chemical and physical mechanisms involved in the phenomena of reagent adsorption on the mineral surface, the impact of pH and type of alkalizing agent, and the effect of pyrite depressants, some already used in the industry and others under investigation. Modern collector reagents are also described, for which, although not yet implemented on an industrial scale, promising results have been obtained in the laboratory, including better copper recovery and selectivity, and even some green reagents present biodegradable properties that generate a better environmental perspective for mineral processing.
6 citations
TL;DR: In this article , the authors discuss various organic depressants that have been adopted for selective depression of unwanted gangue minerals in chalcopyrite flotation, and show that these depressants can partially or fully replace current inorganic depressants used in suppressing both sulfide and non-sulfide gangue mines.
Abstract: Depressants are critical reagents for the selective separation of minerals in froth flotation. They serve a vital role in preferentially making the gangue minerals hydrophilic and prevent them from reporting to the mineral-rich froth phase. Current practice involves the use of inorganic depressants, which are toxic and non-biodegradable. Environmentally friendly, flexible and affordable flotation depressants are needed due to the depletion of easy-to-process high-grade ores as well as sustainability and environmental concerns. This paper discusses various organic depressants that have been adopted for selective depression of unwanted minerals in chalcopyrite flotation. The origin and chemistry, organic depressant-gangue minerals interaction mechanism, and the use of organic depressants in the most common chalcopyrite-flotation instances, including chalcopyrite separation from galena, molybdenite, sphalerite, pyrite, pyrrhotite, talc, serpentine and carbonaceous materials, are discussed. This review shows that organic depressants can partially or fully replace current inorganic depressants used in suppressing both sulfide and non-sulfide gangue minerals in chalcopyrite flotation. In this review, a well-detailed and well-referenced discussion is provided for the current state of organic depressants in chalcopyrite flotation, as well as a valuable discussion is provided to comparatively evaluate the depression performance of the various reported organic depressants. Finally, suggestions are made regarding future research challenges and directions. The recent advancements, developing features, and research prospects discussed in this article will provide a helpful reference for academics who want to delve deeper into the greening of chalcopyrite flotation process.
2 citations
References
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TL;DR: Pyrite is the most common sulfide in the Earth's surface region as discussed by the authors, and it is a key component of a prebiotic iron sulfide world existing at the high pressure and temperature conditions common to hydrothermal vents at the oceanic floor.
328 citations
TL;DR: In this paper, the X-ray photoelectron (XPS) spectrum of pyrite fracture surfaces, exposed for 7 h to water vapour at low pressure (10−5 Pa), showed no change to their Fe(2p) or S(2 p) X-Ray photoelectRON (Xps) spectrum, but oxygen deposition occurs as H2O, OH− and O2− (74, 19, and 7%, respectively).
305 citations
TL;DR: In this article, Nesbitt et al. used synchrotron-radiation-excited photoelectron spectroscopy to monitor sulfur chemical states on fractured pyrite surfaces reacted with atmospheric gases.
177 citations
TL;DR: In this article, the sulphur surface sites of pristine marcasite surfaces and their reactivity during initial air oxidation were investigated for the first time using synchrotron radiation excited photoelectron spectroscopy (SRXPS).
166 citations
TL;DR: In this article, a comparative study of experimentally and naturally weathered pyrites was carried out, and it was found that both types of pyrites share similar species of weathering products and a similar weathering mechanism.
108 citations