China
Africa
Explore chapters and articles related to this topic
Identification of iron sulfide minerals in aggregates by accelerated mortar bar test
Published in Hiroshi Yokota, Dan M. Frangopol, Bridge Maintenance, Safety, Management, Life-Cycle Sustainability and Innovations, 2021
W. Saengsoy, L. Yongchaitrakul, P. Sinlapasertsakulwong, S. Tangtermsirikul
Iron sulfide mineral is the most abundant and common form of sulfide mineral in aggregates, for instance, pyrrhotite (FeS), pyrite (FeS2), chalcopyrite (CuFeS2), pentlandite ((Fe,Ni)9S8), etc. Pyrite, generally known as fool’s gold, due to its shiny brass-yellow color and cubic crystal structure, has a more stable form of iron sulfide than pyrrhotite (Rickard & Luther 2007).
Additional Topics
Published in Anthony Peter Gordon Shaw, Thermitic Thermodynamics, 2020
Pyrite is a very common mineral with a long and fascinating history [110]. Some evidence also suggests that pyrite was known in prehistoric times. Neanderthals probably struck pieces of pyrite with biface stone tools to produce sparks and start fires approximately fifty thousand years ago [111]. Some believe Neanderthals may have used pyrolusite (MnO2) to increase the flammability of tinder and wood [112]. We may never know for sure. One modern use of pyrite is as a raw material for the production of sulfur dioxide and, ultimately, sulfur trioxide and sulfuric acid [113]. Sulfur dioxide and solid oxides are formed when pyrite and pyrrhotite ores are roasted in air. Powdered pyrite is also a decent pyrotechnic oxidizer when it is paired with certain metallic fuels. Combinations involving finely divided magnesium and titanium should produce some of the greatest combustion temperatures (Figure 5.28).
Rock Forming Minerals
Published in Aurèle Parriaux, Geology, 2018
Pyrite is a common accessory mineral in numerous rocks. It is not rare to find it in animal fossils (for example, pyritized ammonites). Pyrite is stable in a reducing environment, but it oxidizes easily in outcrop and produces sulfuric acid, which can attack metallic structures and concrete if it occurs in great abundance. In slag heaps and some tunnel excavation deposits, acidification of water and soils is observed. Pyrite is exploited for the production of sulfuric acid and as iron ore.
Study on the removal effect and mechanism of calcined pyrite powder on Cr(VI)
Published in International Journal of Phytoremediation, 2023
Xingyu Zhu, Shuli Chen, Huanjin Liu, Xiaofang Hu, Chenxu Wei, Mengyu Guo, Yinting Yu, Chunmei Mei, Fugui Chen, Linyu Zheng, Weidong Li
Pyrite is a sulfide mineral primarily composed of FeS2 that is readily found in nature. Recently, pyrite has found applicability in environmental pollution treatment because of its low cost and high efficiency (Song et al.2022). It has also been utilized in the removal of Cr(VI) (Oral et al.2022), adsorption of gaseous elemental Hg in air (Wang et al.2022), treatment of pharmaceutical wastewater by acting as a Fenton reaction catalyst (Kantar et al.2019), and autotrophic denitrification for nitrate removal in water (Li et al.2022). Pyrite and limestone were used as the matrix to build a constructed wetland, which enhanced long-term total nitrogen and total phosphorus removal after three years of operation (Ge et al.2019). Pyrite/sodium hypochlorite treatment removed arsenic from fractured bedrock groundwater via surface adsorption (Lee et al.2023). Pyrite is a traditional Chinese medicine used to reduce pain from fractures and accelerate healing. The traditional Chinese medicine theory holds that pyrite must be calcined at high temperature before it can be used clinically. We found that calcination increased the saturation magnetization of pyrite, and its surface became sparse and porous (Liu et al.2017). Therefore, we speculate that pyrite prepared by the traditional Chinese process has the potential to serve as an excellent adsorbent.
Assessment of heavy metal pollution associated with tailing dam in gold mining area, southern ethiopia
Published in Geosystem Engineering, 2023
Gera Techane, Geremew Sahilu, Lena Alakangas, Worku Mulat, Helmut Kloos
The history of gold mining in southern Ethiopia dates back to the 1930s when placer gold was first discovered. Since then, placer gold has been mined in the area using panning and semi-mechanized hydraulic mining methods. Primary gold production by the open-pit mining method was commenced in the late 1980s. The gold deposit in the area is associated with pyrite (FeS2), chalcopyrite (CuFeS2), galena (PbS), sphalerite (ZnS), arsenopyrite (FeAsS), and other ores (Zenebe, 2006). Pyrite is one of the environmental problems in the mining industry because it releases heavy metal contaminants (Alvarenga et al., 2021; Ardejane et al., 2008). Especially the Legadembi gold deposit is rich in sulfide minerals including pyrite. These minerals, particularly sulfides in the ore aggregate are the major source of heavy metals in the study area (Getaneh & Alemayehu, 2006).
In situ S isotope analysis and source tracing of pyrite from lacustrine hydrothermal sedimentary rocks: the Chang 7-3 sub-member, Triassic Yanchang Formation, Ordos Basin
Published in Australian Journal of Earth Sciences, 2021
J. Y. You, Y. Q. Liu, S. S. Song, D. W. Zhou, Y. Y. Yang
As the most widely distributed sulfide on Earth’s crust, pyrite is found in magmatic, metamorphic and sedimentary rocks with many types of genesis, including magmatic, hydrothermal, sedimentary and metamorphic processes, etc. In recent years, researchers have made major breakthroughs in studying pyrite particles at the nanoscale (Toner et al., 2009), developing biogenic models of pyrite (Mason et al., 2007) and determining the relationship between pyrite and marine hypoxic events (Adams et al., 2010). Hydrothermal sedimentary rocks are sedimentary rocks formed by the precipitation of sub-seafloor hydrothermal fluid (or magmatic hydrothermal fluid) mixed with seawater (or lake water) (Adachi et al., 1986; Bostroem et al., 1979; Dias & Barriga, 2006; Rona et al., 1984; Zheng et al.,2018) and are the focus of attention in recent years in studies of modern hydrothermal vents. Based on the study of pyrite in modern hydrothermal deposits, the main iron-bearing fluids erupt from submarine hydrothermal vents. Iron particles in the vent are thought to be rapidly oxidised and deposited near the vent and provide nutrients for marine microorganisms (Toner et al., 2009). Less attention has been paid to hydrothermal sedimentary rocks of ancient ‘white smokers’, and a better understanding of pyrite developed in them is required (Wen, 2015).