Investigation of the kinetics of spontaneous combustion …
in Dahuangshan mining area of the Southern Junggar coaleld, ... temperature oxidation of di˚erent coal grades11. Zhang et˛al. conducted a temperature-programmed oxidation ()eriment to analyse ...
Arsenic oxidation and immobilization in acid mine drainage …
To achieve this goal, we investigated the distribution of As species in the water and sediments in a typical AMD flow in a karst area, and measured As(III) …
O2 partitioning of sulfur oxidizing bacteria drives acidity and
The acidification of water in mining areas is a global environmental issue primarily catalyzed by sulfur-oxidizing bacteria (SOB). Little is known about microbial …
Hydrogeochemical evolution induced by long-term mining …
The Fengfeng Mining District, which was chosen as the study area, is located in Handan City, Hebei Province, northern China, with a total area of approximately 353 km 2 (Liu and Huang, 2021).It includes the Wu, Yangquhe, and Xinsan sub-mines, and the abandoned Yi and Er mines (Fig. 1).The study area has a sub-humid monsoon climate …
Response of soil microbial activities and ammonia oxidation …
Soil samples in the Xikuangshan mining area were collected and subjected to high through-put sequencing of 16S rRNA and ITS1 to investigate bacterial and fungal communities, respectively, along an ...
Signature of oxygen and sulfur isotopes of sulfate in ground …
In mining areas, oxidation of sulfide minerals and organic sulfur compounds (e.g. in coal mines) are often predominant, while in surrounding areas mineralization of soil organic sulfur, dissolution of primary sulfate minerals such as gypsum and anhydrite, use of fertilizer, or atmospheric sulfate deposition constitute sources of sulfate that ...
Signature of oxygen and sulfur isotopes of sulfate in ground …
Sulfur isotope ratios (δ34S) can also be used to identify sources of sulfate, especially if combined with oxygen isotope ratios of sulfate (Krouse and Mayer, 2000). In mining areas, oxidation of sulfide minerals and organic sulfur compounds (e.g. in coal mines) are often Corresponding author.
(PDF) Acid mine drainage formation, control and
Acid mine drainage (AMD) occurs after mining exposes metal sulfides to oxidizing conditions. Leaching of reaction products into surface waters pollute over …
Pyrite Oxidation Drives Exceptionally High Weathering Rates …
While mountaintop mining operations in Central Appalachia cover less than 0.006% of the land area of Earth, they contribute a globally significant amount of sulfate …
(PDF) Experimental study on the oxidation kinetics of coal in …
Oxidation of crushed remains of coal in the mining area still occurs even at deficient oxygen concentration (Deng et al. 2018b;Jin et al. 2015), which is mainly due to the adsorption of coal pores ...
Ground Water Contamination in Coal Mining Areas: A …
Ground water is becoming a major concern with respect to surface and underground mining of coal in many state of our country coal fields. Groundwater quality is being addressed in this review paper.
O2 partitioning of sulfur oxidizing bacteria drives acidity and
The acidification of water in mining areas is a global environmental issue primarily catalyzed by sulfur-oxidizing bacteria (SOB). Little is known about microbial sulfur cycling in circumneutral ...
Three-dimensional distribution and oxidation degree analysis …
The application of this method in the gangue dump of the Tashan coal mine showed the existence of 17 oxidation areas, covering an area of 31,433 m 2, including 4 shallow oxidation areas, 4 deep oxidation areas in coal waste dumps, and 9 medium-deep oxidation areas. According to the decision criterion, 4 areas with relatively high …
Biogeochemical behavior and pollution control of arsenic in mining
As is constantly migrating from abandoned mining area to the surrounding environment in both oxidation and reducing conditions, threatening human health and ecological safety. The biogeochemical reaction of As included oxidation, reduction, methylation, and demethylation, which is closely associated with microbial metabolisms.
Multi-isotope identification of key hydrogeochemical …
In the study area and other coal or pyrite mining areas, SO 4 2− originates from atmospheric precipitation, the dissolution of gypsum, and the oxidation of sulfides produced by coal or pyrite mining (Banks et al. 2020; Seibert et al. 2017; Sparks et al. 2019; Sun et al. 2019; Zheng et al. 2019; Zhou et al. 2016).
Oxidation
Oxidation - Mining Fundamentals. Download PDF Copy; Request Quote; May 24 2014. Mineral oxidation is a chemical reaction, which takes place in a mineral upon exposure to oxygen, resulting in a change in the chemical composition. It takes place through weathering, which is a breakdown of minerals, rocks, and soil through contact …
Arsenic and antimony co-contamination influences on
Soils from this mining area have been found to contain high As concentrations, ranging from 475 mg kg −1 to 5240 mg kg −1 (Tang et al., 2016). ... In the process of sulfide oxidation, quinone reductase (encoded by the sqr gene), which catalyzes the oxidation of HS-and S 2-to form polysulfides ...
Response of soil microbial activities and ammonia oxidation …
Moreover, other Sb mining areas, such as the largest Hg–Sb mine in Qinling Orogen of China, San Antonio Sb mine in Spain and Mau Due Sb mine in North Vietnam, also exhibited high contamination level . ... Oxidation-reduction potential (ORP), total organic carbon (TOC), soil moisture (MOI), bicarbonate (HCO 3 ...
Oxidation Mechanism of Arsenopyrite in the Presence of Water
Arsenopyrite is commonly present in mining tailings and, together with pyrite, is responsible for acid rock drainage (ARD) phenomenon. The mineral undergoes …
Investigation of the kinetics of spontaneous combustion of …
In the present paper, with using diverse methods (including the SEM, the XRD, the TPO, the FTIR, and the TGA), the authors analysed samples of the major coal seam in Dahuangshan Mining area with ...
Review on the Bio-oxidation of Pyrite: Implications for the Mining Industry
Hence, it cannot be ignored in the modern industry, especially in the Mining industry. Bio-oxidation of Pyrite is an important technology, which mainly means the surface Oxidation and/or the ...
Acid mine drainage from coal mining in the United States – …
Acid mine drainage refers to water discharged from active, inactive, or abandoned mine and reclaimed areas with relatively higher total acidity compared with total alkalinity. It encompasses several chemical, biological, and electrochemical reactions, …
Study on Variation Law of Hazardous Areas in Goaf Based …
The goaf area's concentration of oxygen exhibits an "S" shape distribution pattern. The overall temperature change range within the high-temperature zone of the goaf is 4.5 K, gradually migrating toward the deeper areas. As the air supply rate rises, oxidation zone area gradually decreases, exhibiting an overall sinusoidal distribution.
Acid Mine Drainage from Coal Mining in the United States
Acid drainage occurs through oxidation of sulfide minerals such as pyrite. The main sources of AMD include runoff and seepage from mine rock dumps, open pit …
Kinetics of the major coal seam in typical coal mining areas …
Coal oxidation at low temperatures is the heat source liable for the self-heating and spontaneous combustion of coal. This phenomenon has imposed severe problems in coal related industries.
Assessment of heavy metal distribution and bioaccumulation …
Monitoring heavy metals (HMs) across source distance and depth distribution near coal mining sites is essential for preventing environmental pollution and health risks. This study investigated the distribution of selected HMs, cadmium (Cd2+), chromium (Cr2+), copper (Cu2+), manganese (Mn2+), nickel (Ni2+), lead (Pb2+), and …
Arsenic oxidation and immobilization in acid mine drainage in karst areas
The AMD originates from Jiaole coal mine, which is located in Xingren county (25°21′60″N, 105°8′59″E), Guizhou province in Southwest China (Fig. 1 a).The bedrock in the area is mainly composed of carbonate rocks (Wu et al., 2009).The mining activity was halted in 1990s.
Microbially mediated sulfur oxidation coupled with arsenate …
Since As is frequently found as sulfidic minerals in the environment, microbial mediated sulfur oxidation coupled to As(V) reduction (SOAsR), a chemolithotrophic process, may be more favorable in oligotrophic mining-impacted sites (e.g., As-contaminated mine tailings).
Arsenic release from arsenopyrite weathering in acid
Arsenopyrite (FeAsS) is the most common As-bearing mineral, which broadly distribute in mineralized areas (Tabelin et al., 2020, 2021), also distribute in groundwater and civil works for resource utilization (Huyen et al., 2019, Park et al., 2019), and its oxidation is the widespread mechanism for the distribution of arsenic into the ...