Pyrite Oxidation and Its Control

Evangelou, V. P.

doi:10.1201/9780203741641

Cited by 114 publications

(47 citation statements)

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“…Both minerals are present in the Lower and Middle Jurrasic formations (Krumbeck, ; Schröder, ), and pyrite is especially abundant in the thick claystone sequence of the Amaltheenton and Opalinuston formations that cover large areas of the eastern subcatchments (Wippern, ). The principles of pyrite oxidation follow a sequence of reactions that involve microbiologically mediated and oxic decomposition of pyrite followed by an anoxic decomposition of pyrite by ferric iron (Evangelou, ; Lowson, ). The overall stoichiometry is represented by

2 Fe S_{2} + 7 O_{2} + 2 H_{2} normalO \to 2 {Fe}^{+} + 4 {SO}_{4}^{2 -} + 4 H^{+} .

…”

Section: Discussionmentioning

confidence: 99%

Insights into agricultural influences and weathering processes from major ion patterns

Geldern

Schulte

Mäder

et al. 2018

Hydrological Processes

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Karst areas and their catchments pose a great challenge for protection because fast conduit flow results in low natural attenuation of anthropogenic contaminants. Studies of the hydrochemistry of karst sources and river solutes are an important tool for securing and managing water resources. A study of the geochemical downriver evolution of the Wiesent River and its tributaries, located in a typical karst terrain, revealed unexpected downstream decreases of nitrate with maximum mean values of 30 mg/L at the source to minimum values of 18 mg/L near the river mouth. This trend persisted over the length of the river even though increased agricultural activities are evident in the downstream section of the catchment. This pattern is caused by fertilizer inputs via diffusive and fast conduits flow from karst lithology in the upstream area that may have reached the river's source even from beyond the hydrological catchment boundaries. Further downstream, these influences became diluted by tributary inputs that drain subcatchments dominated by claystone and sandstone lithologies that increased potassium and sulphate concentrations. Our findings indicate that bedrock geology remains the dominant control on the major ion chemistry of the Wiesent River and that agricultural influences are strongest near the headwaters despite increased land use further downstream, due to long‐term storage and accumulation in karst aquifers. This feature may not be unique to the Wiesent River system, as carbonates cover significant portions of the Earth's surface and subsequent work in other river systems could establish whether such patterns are ubiquitous worldwide.

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2 Fe S_{2} + 7 O_{2} + 2 H_{2} normalO \to 2 {Fe}^{+} + 4 {SO}_{4}^{2 -} + 4 H^{+} .

…”

Section: Discussionmentioning

confidence: 99%

Insights into agricultural influences and weathering processes from major ion patterns

Geldern

Schulte

Mäder

et al. 2018

Hydrological Processes

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“…Piritin hidrojen peroksit varlığında çözünmesi 17 ve 18 no'lu tepkimeler ile ifade edilmektedir. 18 no'lu tepkime yüksek asidik koşullarda gerçekleşmektedir (Evangelou, 1995;Antonijević, vd., 1997):…”

Section: Literatürdeunclassified

Kri̇ti̇k Metal Konumundaki̇ Kobaltin Bi̇ri̇nci̇l Ve İki̇nci̇l Kaynaklardan Üreti̇mi̇

Yaylali

Yazıcı

Celep

et al. 2020

Bilimsel Madencilik Dergisi

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https://orcid.org/0000-0003-4105-0912 ÖZ Kobalt, jet motorları, süper alaşımlar, şarj edilebilir piller gibi özellikle ileri teknoloji ürünlerinde kullanılan bir metaldir. Yüksek ekonomik önemi ve temin riski göz önüne alınarak Avrupa Birliği (AB) tarafından "kritik hammadde" olarak tanımlanmıştır. Birincil kaynaklardan üretilen kobaltın %84'ü bakır ve nikel üretiminin yan ürünü olarak sağlanmaktadır. Özellikle lateritik nikel cevherlerinden kobalt üretimi Dünya'da ve ülkemizde artmaktadır. Lateritlerden Ni/Co kazanımı için son yıllarda yüksek basınçlı asit liçi (HPAL) içeren hidrometalurjik prosesler uygulanmaktadır. Artan kobalt talebine bağlı olarak ikincil kaynaklardan (bakır ergitme cürufları, flotasyon atıkları (pirit konsantreleri), pirit külleri) biyo/hidrometalurjik yöntemler ile kobalt kazanımına yönelik çalışmalar da artış görülmektedir. Bu çalışmada, kobaltın kritik hammadde olarak önemi, Dünya ve ülkemizin kobalt potansiyeli ve cevherlerden kobalt üretimi için uygulanan prosesler detaylı olarak incelenmiştir. Literatürde birincil ve ikincil kaynaklardan kobalt kazanımı üzerine yapılmış farklı araştırmaların bulguları tartışılmıştır. Ayrıca, ülkemizde lateritik cevherlerden ve flotasyon atıklarından kobalt kazanımı amacıyla kurulan tesislerin akım şemaları ile birlikte sunulmuştur. ABSTRACTCobalt is utilised in various high-tech products such as jet engines, super alloys and rechargeable batteries. In view of its relatively high economic importance and supply risk, European Union (EU) has listed cobalt as one of the "critical raw materials". About 84% of cobalt produced from primary resources is extracted as a by-product of copper and nickel production. Production of cobalt, particularly from lateritic nickel ores, is increasing. Recently, hydrometallurgical processes such as high pressure acid leaching (HPAL) are commonly applied for extraction of Ni/Co from laterites. Based on the increasing demand for cobalt, the extraction of cobalt from secondary resources (copper smelting slags, flotation tailings (pyrite concentrates), pyrite ashes) by bio/ hydrometallurgical methods have been extensively investigated. In this paper, the importance of cobalt as a critical raw material, resource potential of cobalt in the world and Turkey, and industrial processes for production of cobalt from ores are reviewed in detail. Previous studies on the recovery of cobalt from primary and secondary resources are discussed. In addition, process flowsheets of various industrial plants for the recovery of cobalt from lateritic ores and flotation tailings in our country are presented. Derleme / Review

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“…Factors of influence are, for instance, pH, pO 2 , the specific surface and morphology of pyrite, the presence of bacteria and/or clay minerals, as well as hydrological factors. 21 Pyrite in mining waste or coal overburden is initially oxidized by the atmospheric O 2 producing H + , SO 2− 4 , and Fe 2+ . The divalent iron can be further oxidized by O 2 into Fe 3+ .…”

Section: Acid Rock (Mine) Drainagementioning

confidence: 99%

Sustainability in Mining

Voncken

Buxton

2019

World Scientific Series in Current Energy Issues

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Sustainability is often defined as: the ability to continue a defined behavior indefinitely. However, considering the nature of mining operations, this cannot be meant with the phrase "Sustainability in Mining". Sustainability in the mining industry should be understood in the same way as sustainability in environmental science: meeting the resources and services needs of current and future generations without compromising the health of the ecosystems that provide them. A number of aspects of this are addressed in this chapter: use of energy, use of water, land disruption, reducing waste (involving solid waste, liquid waste, and gaseous waste), acid rock drainage when dealing with sulfide minerals, and restoring environmental functions at mine sites after mining has been completed. To do everything in an environmentally sound way is costly, but in the end necessary. Regarding this, it is concluded that governmental regulations concerning emission of waste, storage of waste and re-use of the land after mining are essential to provide a sustainable form of mining and mineral processing.

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Pyrite Oxidation and Its Control

Cited by 114 publications

References 0 publications

Insights into agricultural influences and weathering processes from major ion patterns

Insights into agricultural influences and weathering processes from major ion patterns

Kri̇ti̇k Metal Konumundaki̇ Kobaltin Bi̇ri̇nci̇l Ve İki̇nci̇l Kaynaklardan Üreti̇mi̇

Sustainability in Mining

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