The range is 0.180−0.224 mm for lignite and 0.125−0.224 mm for anthracite. After the coal is crushed to 0.180−0.224 mm, the crushing process begins to exert a weaker effect on the consumption of aliphatic hydrocarbon groups. ... For both raw coal and oxidized coal, coal crushing can induce the production of new free radicals. In the ...
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enter a compaction crushing state [13– 16]. e crushing of coal is affected by its strength, local particle size, and impact energy [17–2 1]. e coal loading process …
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Bekele, A., Roy, J. L. and Young, M. A. 2015. Use of biochar and oxidized lignite for reconstructing functioning agronomic topsoil: Effects on soil properties in a greenhouse study. Can. J. Soil Sci. 95: 269–285. Interest in the use of biochar as soil amendment has grown recently. However, studies evaluating its potential use for …
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DOI: 10.1016/j.energy.2021.122796 Corpus ID: 244814689; Gasification characteristics and thermodynamic analysis of ultra-lean oxygen oxidized lignite residues @article{Chen2021GasificationCA, title={Gasification characteristics and thermodynamic analysis of ultra-lean oxygen oxidized lignite residues}, author={Liangzhou Chen and …
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Leonardite (LND), a low-grade coal, is an inexpensive material used to improve soil fertility in humic-deficient soils. Our objective was to quantify the ability of LND to immobilize atrazine (ATZ). To accomplish this, LND morphological properties, elemental composition, and spectroscopic properties were determined. We found that LND had a …
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Five coal samples obtained from Chinese coal-producing areas were oxidized by hydrogen peroxide (H 2 O 2 ), and humic acids (HAs) were derived from original coal and its oxidizition samples. HAs were
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A molecular structure model of oxidized Shengli lignite was constructed using ultimate analysis, 13C nuclear magnetic resonance spectrum (NMR), and Fourier transform infrared spectroscopy (FTIR).
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oxidized lignite treated trees showing the greatest increase. No treatments significantly increased dry mass for red maple. Foliar applications of humic substances and shoot growth: Sladky and Tichy (1959) sprayed tomato plants with a solution of 300 mg/ L …
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The spontaneous combustion parameters of lignite at different oxygen concentrations and temperatures were studied by temperature-programmed oxidation experiments. The characteristic parameters, tendency, …
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Biodegradation of photo-oxidized Inner Mongolia lignite by pseudomonas aeruginosa was studied and the degradation percentage reached 56.27%, while the corresponding degradation percentage of the strain degrading raw Inner Mongolia lignite is only 23.16%. The degradation products were characterized. Proximate and ultimate …
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Humic acids (HAs) are high molecular weight biopolymers generally obtained from humic compounds of organic matter distributed in the soil, peats and sapropels, natural waters, low rank coals, leonardite and lignite coals (Savel'eva et al., 2015, 2017; Huculak-Mączka et al., 2018; Fuentes et al., 2018)mercial HAs are mainly extracted from …
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The dried samples to 40–80 mesh (0.18–0.38 mm) were sieved and sealed after crushing. The results of elemental and proximate analysis for raw coal are listed in Table 1. Two groups of 20 g coal samples, named O100 and O200, were pre-oxidized using a high-temperature tube furnace to reflect the initial oxidation of oxidized coal in fire zones.
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After crushing and grinding, the coal particles were sealed and stored at room temperature and isolated from oxygen, which a particle size of less than 160 …
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Biodegradation of photo-oxidized lignite and characterization of the products Jiantao Li, Xiangrong Liu, Zilin Yue et al.- ... The fuel preparation system is …
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And the proximate analysis of lignite is presented in Table 1. After sampling, the fresh lignite was stored in vacuum-sealed bags and promptly transported to the laboratory for low-temperature crushing (below 50 °C). Pulverized lignite with a particle size below 75um was screened from crushed coal samples by a standard sieve and stored
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A possible explanation for this might be that the ignition point of the oxidized lignite is around 400 °C. Further, in order to compare the evolution law of oxidized lignite element components during the pre-oxidation, the absolute content of C, H, N, S, and O in each coke sample was calculated according to the ash balance.
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Therefore, the addition of water can inhibit the generation process of CO during the crushing process of coal. Lignite with low metamorphic grade can be oxidized to produce CO at ambient ...
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1.7 Lignite Combustion. 1.7.1 General1-5. Coal is a complex combination of organic matter and inorganic ash formed over eons from successive layers of fallen vegetation. Coals …
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Lignite oxidizes easily during storage and transportation. Furthermore, the surface characteristics of lignite change during oxidation, affecting its thermal conversion process. Herein, the surface functional groups and pore structures of lignite oxidized at temperatures below 190 °C were investigated. Moreover, the kinetics and …
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The oxidation tests of coal samples by Küçük et al. showed that the particle size is an important factor affecting coal spontaneous combustion. The smaller the particle size is, the greater the tendency for coal spontaneous combustion becomes. ... After …
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Request PDF | Immobilization of Atrazine Using Oxidized Lignite Amendments in Agricultural Soils | Leonardite (LND), a low-grade coal, is an inexpensive material used to improve soil fertility in ...
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The chemical structure of lignite plays a fundamental role in microbial degradation, which can be altered to increase gas production. In this study, the structural changes in lignite were analyzed by conducting …
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Terahertz technology holds promise for monitoring coal fires and assessing associated risks, relying on the dielectric response of coal during the oxidation process.Besides, unraveling the response mechanism is crucial for enhancing the application's reliability. In light of these, this study focused on investigating the terahertz …
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Great progress has been made in the detection of fractions from oxidized lignite, but no molecular structures are reported. A molecular structure model of oxidized Shengli lignite was constructed using ultimate analysis, 13 C nuclear magnetic resonance spectrum (NMR), and Fourier transform infrared spectroscopy (FTIR). Parameters are …
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The oxidized samples were used to study the effect of hydrogen bonding on binderless briquetting of lignite. Hydrogen peroxide solution (30 vol.%) was used for oxidation of lignite. 10 g of HL lignite samples was added into 100 ml of hydrogen peroxide solution in a 250 ml round bottom flask.
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Low rank/oxidized coals are difficult to float with oily collectors. The presence of polar hydroxyl, carbonyl, phenol groups and some peroxide type oxygenated moieties on the surface of low rank/oxidized coals is the main factor which decreases the coal hydrophobicity. ... The lignite is difficult to float with common collectors due to these ...
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We studied the effects of amending clay, loam, and sand subsoil substrates with wood biochar pyrolized at 800°C, oxidized lignite (humalite), or labile organic mix (sawdust, wheat straw, and ...
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