Influence of Calcination and Acidification on Structural Characterization of Anyang Anthracites

Zhang, Yude; Kang, Xiaojuan; Tan, Jinlong; Frost, Ray L.

doi:10.1021/ef401658p

Cited by 69 publications

(50 citation statements)

References 26 publications

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“…The FTIR spectra of raw and MA are shown in Figure . We observe stretching vibrations and in‐plane vibrations of the hydroxyl bonds (OH) at the spectral peaks at 3100–3600 and 1400 cm −1 , respectively . After modification of the coal, the strength of these peaks is decreased, which corresponds to a decrease in the hydroxyl content on the coal surface; silanol formed by the hydrolysis of the silane coupling agent can react with and consume hydroxyl groups or cover their signals.…”

Section: Resultsmentioning

confidence: 96%

Thermal and mechanical enhancement of styrene–butadiene rubber by filling with modified anthracite coal

Tan

Hong-zhi

Wei

et al. 2019

J of Applied Polymer Sci

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Anthracite is the highest rank of coal with a layered structure similar to that of graphite. Here, styrene-butadiene rubber/modified anthracite (MA) composites were prepared and analyzed. The microstructure and dispersion of the anthracite were improved by ball milling with the modifier bis-(γ-triethoxysilylpropyl)-tetrasulfide (KH-Si69). The particle size of the modified coal was decreased significantly tõ 3 μm, while surface interactions with the modifier yielded enhanced lamellar morphology and hydrophobic surfaces. The anthracite lamellae were well dispersed in the rubber matrix, providing good reinforcement; the tensile strength of the composite exceeded that of a composite with carbon black (CB) N660 filler (16.65 vs. 14.68 MPa). Moreover, low-level CB or silica compositing further promoted the dispersion of coal particles in the rubber, effectively enhancing the mechanical reinforcement behavior of the coal particles as well as the thermal stability of the rubber composite. Notably, it led to a 10.63% improvement in tensile strength and a 9.96 C increase in the 5% mass loss temperature compared to the composite with a single MA filler.

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Section: Resultsmentioning

confidence: 96%

Thermal and mechanical enhancement of styrene–butadiene rubber by filling with modified anthracite coal

Tan

Hong-zhi

Wei

et al. 2019

J of Applied Polymer Sci

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“…A lot of amorphous carbons are in the internal of ICA due to the underdevelopment of carbon crystallites structure. It has been confirmed that the ( γ ) band around 20° is the amorphous carbon such as aliphatic side chains …”

Section: Resultsmentioning

confidence: 90%

Influences of Coal Tar Pitch on Metallurgical Properties of Iron Carbon Agglomerates

Bao

Chu

Han

et al. 2019

steel research int.

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Utilization of iron carbon agglomerates (ICA) with high reactivity in blast furnace (BF) can reduce fuel ratio and carbon emission by decreasing the temperature of thermal reserve zone, which is considered to be an innovative technology for achieving low-carbon ironmaking. Herein, the influences of coal tar pitch (CTP) as binder on the metallurgical properties of ICA are investigated. The results show that the compressive strength of ICA is first enhanced from 1639 to 3168 N and then reduced to 2243 N with the ratio of CTP increasing from 0% to 11%. Meanwhile, the drum strength (I 600 10 ) of ICA is accelerated from 67.3% to 80.5% and then leveled off. In addition, the reactivity of ICA is mitigated from 65.6% to 58.1% first and then increased to 68.8%, while the post-reaction strength shows an inverse trend. When the ratio of CTP is 5-7%, the mechanical strength, reactivity, and post-reaction of ICA are all at a relatively better levels. For the ICA with adding CTP, the mechanical strength is dependent on the microstructure, pore volume, and specific surface area, whereas the variation of reactivity and post-reaction strength are relevant to the pore structure and carbon crystallites structure.

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“…Then, the radical polymerization reactions among the tar intermediates played a leading role, which would produce heavy tar or char fragments. Obviously, the free‐radical recombination reaction would reduce the tar yield …”

Section: Resultsmentioning

confidence: 99%

Enhancement of low‐temperature lignite pyrolysis by recycled carbocoal for high‐quality tar in fixed‐bed reactor

2019

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Lignite could be converted to high value‐added char and tar through a pyrolysis process. To improve the tar yield as well as the quality of tar/char during a low temperature (550 °C) lignite pyrolysis (LT‐LP) process, the influence of mixing inexpensive and accessible recycled carbocoal with three kinds of lignite was investigated in a fixed‐bed reactor. The LT‐LP processes with and without recycled carbocoal were investigated using a TGA and were compared in detail. The results indicated that the addition of the recycled carbocoal into the three lignite optimized the light tar yield from 4.63, 3.33, and 2.09 g/g to 10.50, 6.10, and 5.01 g/g, and improved the gasification reactivity of the chars up to 2.88, 2.58, and 2.88 h−1, respectively. To identify the role of recycled carbocoal during the LT‐LP process, the obtained products, such as tar and char, were characterized by chromatography, thermal gravimetric analyzer, chromatograph‐mass spectrometer, elemental analyzer, Fourier transform infrared spectroscopy, and scanning electron microscope. It was demonstrated that the existence of the recycled carbocoal could impede the self‐polymerization of small molecule hydrogen‐containing (SM‐HC) free radicals and cut down the reactions between SM‐HC and hydroxyl radicals at the weak‐bonds breaking zone (300–450 °C), thereby supplying sufficient free radical stabilizers for the tar intermediates at the molecular skeleton region (450–550 °C). The high‐valued tar and char were obtained. In summary, the employment of recycled carbocoal during the LT‐LP process could not only promote the economic benefit of LT‐LP products but also reduce the cost of lignite value‐added utilization.

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Influence of Calcination and Acidification on Structural Characterization of Anyang Anthracites

Cited by 69 publications

References 26 publications

Thermal and mechanical enhancement of styrene–butadiene rubber by filling with modified anthracite coal

Thermal and mechanical enhancement of styrene–butadiene rubber by filling with modified anthracite coal

Influences of Coal Tar Pitch on Metallurgical Properties of Iron Carbon Agglomerates

Enhancement of low‐temperature lignite pyrolysis by recycled carbocoal for high‐quality tar in fixed‐bed reactor

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