Pyrite thermal decomposition in source rocks

Labus, Małgorzata

doi:10.1016/j.fuel.2020.119529

Cited by 28 publications

(15 citation statements)

References 36 publications

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“…This is because the original mineral pyrite (FeS 2 ) gradually decomposes when the pyrolysis temperature is above 500°C, and S then escapes in the form of S 2 (g). With the pyrolysis temperature rising to 800°C, the escape of S in the pyrite continues to increase and finally forms pyrrhotite with low sulfur content, and its molecular form is similar to Fe 2 S 31,32 …”

Section: Resultsmentioning

confidence: 99%

Sequential transformation study of minerals during underground coal gasification: Promising to indirectly reflect the actual reaction condition

Wang

et al. 2021

Asia-Pacific J Chem Eng

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The mineralogical characteristics of underground coal gasification (UCG) residuals are closely related to the gasification conditions. The study of the mineral composition and transformation of ash and slag under different gasification conditions has important scientific significance for understanding the real gasification conditions, improving the utilization efficiency of coal, and identifying and controlling the environmental impact. In this paper, the sequential transformation of minerals under different temperature and atmosphere are studied by X‐ray diffraction (XRD) and FactSage software, and the elemental composition of the surface of the UCG ash and slag is characterized by SEM‐EDX. The results show that the main minerals in the semicoke are quartz (SiO2), illite (K1.5Al4(Si6.5Al1.5)O20(OH)4), and sanidine (KAlSi3O8). In the 900–1300°C reduction, ash, quartz, sanidine, hercynite (FeAl2O4), anorthite (CaAl2Si2O8), and mullite (Al6Si2O13) are the main minerals. The minerals in the oxidation residuals (1100–1500°C) are quartz, anorthite, hematite (Fe2O3), hercynite, cordierite (Fe2Al4Si5O18), and cristobalite. The reaction temperature has a significant effect on the changes in mineralogy. The reaction temperature is low during the pyrolysis process, and most changes involve only structural changes. With the reaction temperature increases, a series of reactions occur between different minerals. The reaction atmosphere also has a significant effect on the mineralogy. The research on the transformation of minerals in UCG residues can indirectly reflect the actual process of UCG, which can provide suggestions for the stable operation of the UCG process.

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Section: Resultsmentioning

confidence: 99%

Sequential transformation study of minerals during underground coal gasification: Promising to indirectly reflect the actual reaction condition

Wang

et al. 2021

Asia-Pacific J Chem Eng

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“…The fourth range might involve various mineral impurities from sediments. For sample A (white + black layer), there is an considerable weight loss and endothermic peak at around 566 °C, which matches the decomposition of pyrite, producing elemental sulfur [23]. The fifth range is the decomposition of calcite.…”

Section: Quantitative Study By Thermal Analysismentioning

confidence: 93%

Characterizing the sealing materials of the merchant ship Nanhai I of the Southern Song Dynasty

et al. 2021

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Nanhai I is a highly valuable shipwreck of the Southern Song Dynasty for studying various topics, including the shipbuilding techniques. The sealing materials are of significant importance to ensure the ship’s reliability during the voyage across the ocean and they were rarely analyzed. Therefore, the sealing materials of this ship were analyzed by several analytical approaches. The sealing materials included two types, i.e., gap filler with jute fibers and surface coating without any oakum. The main components of both types of putty are calcite with minor Tung oil. The weight ratio of Ca(OH)2/Tung oil range from 4.3:1 to 7.9:1 for surface coating samples and the weight ratio of Ca(OH)2/organics is 3.1:1 for the gap filler sample. Additionally, we first find that the surface coating has a layered structure, where outer layers contain more Tung oil than inner layers. The innermost layer of the surface coating sample might be altered by organic acids from wood deterioration, causing its loose structure and grey color. The composite layers with different formula might be a result of balancing the costs and performances of the putty.

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“…The T TG for the kerogen sample was 424.5 • C. The residual organic matter and a large part of the organic matter that had not undergone pyrolysis burnt up to a temperature of almost 956 • C. Thus, it can be seen that under the conditions of this experiment, it was not possible to fully pyrolyze it in the range of 300-650 • C. The presence of inorganic matter not only inhibits the pyrolysis of organic matter but also can disturb the thermogram of pyrolysis process. Some minerals, including sulfides (pyrite, marcasite) or some clay minerals (e.g., kaolinite), decompose in the temperature range between 300 and 650 • C [26,[37][38][39].…”

Section: Tg/dtgmentioning

confidence: 99%

“…The presence of inorganic matter not only inhibits the pyrolysis of organic matter but also can disturb the thermogram of pyrolysis process. Some minerals, including sulfides (pyrite, marcasite) or some clay minerals (e.g., kaolinite), decompose in the temperature range between 300 and 650 o C [26,[37][38][39].…”

Section: Tg/dtgmentioning

confidence: 99%

Differentiation of the Generation Potential of the Menilite and Istebna Beds of the Silesian Unit in the Carpathians Based on Compiled Pyrolytic Studies

et al. 2021

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The study of the source rocks was carried out with the use of various analytical methods in order to assess their generation potential and to predict the decomposition products of organic matter. The selected samples from the Menilite Beds from the Silesian and Dukla units, as well as the Istebna layers from the Silesian unit, which are classified as weak and medium source rocks in the Carpathian oil system, were examined. The generation potential and type of the products obtained from the pyrolysis of the analyzed source rocks, despite the often comparable overall content of organic matter, are significantly different. Menilite shale generated a higher abundance of hydrocarbons (alkanes, alkenes, and isoalkanes) by stage pyrolysis, which suggested that the organic matter of Menilite shale is different from the Istebna source rocks. Moreover, the thermogravimetric analysis showed a two-stage weight loss in the case of Menilite shales, while the Istebna shales were characterized by a one-stage weight loss at higher temperature. For the Istebna layers, n-alkanes from the C1–C5 range were detected as the main pyrolysis products, which proves the gas-forming type of the organic matter dispersed in these sediments. Rock-Eval analyses showed that the organic matter reached a degree of maturity corresponding to the early thermocatalytic processes (the initial oil window stage) and therefore was able to generate liquid and gaseous hydrocarbons. The comparison of the decomposition temperatures of the organic matter from the Rock-Eval and TG analyses allowed us to conclude that both measurements correlate well and can be equally used to assess the level of thermal transformations of organic matter.

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Pyrite thermal decomposition in source rocks

Cited by 28 publications

References 36 publications

Sequential transformation study of minerals during underground coal gasification: Promising to indirectly reflect the actual reaction condition

Sequential transformation study of minerals during underground coal gasification: Promising to indirectly reflect the actual reaction condition

Characterizing the sealing materials of the merchant ship Nanhai I of the Southern Song Dynasty

Differentiation of the Generation Potential of the Menilite and Istebna Beds of the Silesian Unit in the Carpathians Based on Compiled Pyrolytic Studies

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