Identification of leonardite, a naturally oxidized lignite, by …
Leonardite is a naturally oxidized lignite characterized by high percentages of humic acids. Visual inspection is usually insufficient to distinguish leonardite from lignite. The low-angle X-ray scatterings from 8-2.5A degrees of lignite, leonardite and humic acids were analyzed. The primary subpeak shifts from 3.37A degrees for leonardite to 3 ...
Use of biochar and oxidized lignite for reconstructing …
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 ...
Experimental Study on Crushing Characteristics of Lignite …
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 …
Construction of a molecular structure model of mild-oxidized …
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 …
Effect on the oxidation characteristic at lignite of two types …
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 …
Co-pyrolysis characterization of pre-oxidized lignite and …
For lignite, Tahmasebi et al. [13] pre-oxidized Chinese lignite by an air/oxygen dry oxidation process in a fluidized bed at temperatures of 150–300 °C. The oxidation of the aliphatic portion of the lignite's organic structure resulted in the formation of oxygen-containing functional groups, and the increase in temperature resulted in a ...
Dynamic evolution of terahertz permittivity of lignite during …
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 …
Reignition characteristics of lignite affected by pre-oxidation …
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.
Analysis of influencing factors in permittivity of oxidized lignite …
The experimental process is shown in Fig. 1. Fig. 1 a exhibits the three types of lignite that were sampled from Baorixile (BRXL) mine, Yannan (YN) mine, and Zhanihe (ZNH) mine in Hulunbeier City, Inner Monggol Autonomous Region, China. The result of the proximate analysis is listed in Table 1.From the surface of the raw coal, the oxide layer …
Immobilization of Atrazine Using Oxidized Lignite …
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 …
Extraction and purification of humic acids from lignite …
The non-fuel utilization of lignite is of great significance, and mild oxidative depolymerization is a promising approach for producing oxygen-containing chemicals. In this work, Xiaolongtan lignite (XLT) was used to investigate selective oxidation under mild conditions, with the aim of avoiding excessive oxidation and reducing alkali consumption.
Physicochemical properties, combustion kinetics and …
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 …
Characterization of humic acids from original coal and its …
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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Review A short review of improvement in flotation of low rank/oxidized …
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 ...
1.7 Lignite Combustion
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 are classified by rank according to their progressive alteration in the natural metamorphosis from lignite to anthracite. Coal rank depends on the volatile
Identification of Leonardite, a Naturally …
Leonardite is naturally oxidized lignite characterized by high content of humic and fulvic acids which are used in the agricultural production (Broughton, 1972, Lee and Barlett, 1976). A zeolite ...
Effects of ion-exchanged calcium, barium and magnesium …
The oxidized lignite, which has been proved to be appropriate for quantitatively examine the extent of CLR during direct liquefaction, was used as a model coal to study the effects of ion-exchanged calcium, barium and magnesium on CLR during direct liquefaction of the oxidized lignite. The amounts of tetrahydrofuran (THF) …
Gasification characteristics and thermodynamic analysis of …
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 …
An experimental study on binderless briquetting of Chinese lignite …
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.
Development and prospect of lignite burning power …
Biodegradation of photo-oxidized lignite and characterization of the products Jiantao Li, Xiangrong Liu, Zilin Yue et al.- ... The fuel preparation system is …
Study on Spontaneous Combustion Characteristics …
The spontaneous combustion parameters of lignite at different oxygen concentrations and temperatures were studied by temperature-programmed oxidation experiments. The characteristic parameters, tendency, …
Sources of underground CO: Crushing and ambient
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 ...
Oxidized Lignites and Extracts from Oxidized Lignites …
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 …
Characterization of humic acids from original coal and its …
Yield of HAs. HAs yield depended on extraction and refinement rather than the proportion of HAs in coal. The yields of the HAs extracted from original coal and oxidized coal were presented in Fig. 1.The yield of the HAs extracted from original coal accounted for 5.42% to 66.79% of the coal weight, and the lowest and highest yield …
Novel insights into the molecular structure of lignite and its
1. Introduction. Lignite, a kind of low-rank coal, is abundant in China, with production of >900 million tons in 2019 [1].Lignite is broadly utilized in three ways, as fuel for power generation and industrial boilers, chemical raw materials such as liquefaction, gasification and coking, and civil bulk coal [2, 3].As we know, clean and efficient …
Colonization and degradation of oxidized bituminous and lignite …
APenicillium sp. previously shown to grow on lignite coals degraded an air-oxidized bituminous coal (Illinois #6) to a material that was more than 80% soluble in 0.5 N NaOH. Scanning electron microscopy of the oxidized Illinois #6 revealed colonization of the surface by thePenicillium sp., production of conidia, and erosion of the coal surface. The …
Extraction of Humic Acid from Lignite by KOH-Hydrothermal Method
Humic acid (HA) was extracted by a hydrothermal method from Huolinhe lignite from Inner Mongolia. The effects of the alkali-to-carbon mass ratio, water-to-coal mass ratio, reaction temperature, and reaction time on the HA yield were investigated. The physicochemical characterization of the products was performed, and the reaction mechanism was …
Extraction of Humic Acids from Lignite and Its Use …
Lignite was crushed and sieved through a 60 mesh sieve and dried in a vacuum oven at 105 °C to a constant weight. In this paper, ultrasound-assisted acid pretreatment of lignite was used. 20 g of …