Textural changes in metallurgical coke prepared with polyethylene

Gornostayev, Stanislav S.; Heino, Jyrki; Kokkonen, Tommi; Makkonen, Hannu V.; Huttunen, Satu; Fabritius, Timo

doi:10.1007/s12613-014-0997-3

Cited by 6 publications

(4 citation statements)

References 17 publications

(25 reference statements)

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“…Sample heating and cooling were done in inert atmosphere (N 2 , 2 L/min). The coking battery has been previously used to study the effect of plastic addition to coking coal blends [19] and it has been shown to produce good quality lab-scale coke for analysis. Charcoal and Kraft-lignin additions (described in Section 2.3) decreased the proportion of larger coking coal in the blend.…”

Section: Coking Experimentsmentioning

confidence: 99%

Effect of Charcoal and Kraft-Lignin Addition on Coke Compression Strength and Reactivity

et al. 2017

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Abstract:The aim of this research was to investigate the effects of charcoal and Kraft-lignin additions on the structure, cold compression strength, and reactivity of bio-cokes produced at the laboratory scale. Bio-cokes were prepared by adding charcoal and Kraft-lignin (2.5, 5.0, 7.5, and 10.0 wt %) to medium-volatile coal and coking the mixture with controlled heating rate (3.5 • C/min) up to 1200 • C. In addition, four particle sizes of charcoal were added with a 5 wt % addition rate to investigate the effect of particle size on the compression strength and reactivity. Thermogravimetric analysis was used to evaluate the pyrolysis behavior of coal and biomasses. Optical microscopy was used to investigate the interaction of coal and biomass components. It was found that by controlling the amount of charcoal and Kraft-lignin in the coal blend, the compression strength of the bio-cokes remains at an acceptable level compared to the reference coke without biomass addition. The cold compression strength of the charcoal bio-cokes was higher compared to Kraft-lignin bio-cokes. The reactivity of the bio-cokes with charcoal addition was markedly higher compared to reference coke and Kraft-lignin bio-cokes, mainly due to the differences in the physical properties of the parental biomass. By increasing the bulk density of the coal/biomass charge, the cold compression strength of the bio-cokes can be improved substantially.

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Section: Coking Experimentsmentioning

confidence: 99%

Effect of Charcoal and Kraft-Lignin Addition on Coke Compression Strength and Reactivity

et al. 2017

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“…Coke is a porous, fissured material which consists of pores, microfissures, and a solid carbon matrix with organic and inorganic inclusions. Recent research has shown that the properties of metallurgical coke depend on the relative proportion of isotropic carbon and inert, the size and shape of the anisotropic carbon units, the interface among textural components, porosity, and ash chemistry [ 16 , 17 ]. Many scientists also studied the consequences of anisotropy and the isotropic effect on coke quality and other technological parameters.…”

Section: Resultsmentioning

confidence: 99%

A Simple Method of Evaluating the Thermal Properties of Metallurgical Cokes under High Temperature

et al. 2021

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The reactivity index of weight loss (RI) and tumbling strength after the reaction (I10600) of manufacturing coke were first tested at a temperature series of 1100, 1200, and 1300 °C under CO2 atmosphere with different compositions and duration times to study the effects of temperature, time, and gas composition on coke hot strength. Then the RI/I10600, carbon structure, and optical texture of the cokes prepared from different single coals were mainly studied after a solution reaction with CO2 under a high temperature of 1300 °C and a standard temperature of 1100 °C. It was found that temperature greatly affects the RI/I10600 of coke, especially at high temperatures up to 1300 °C. Compared with standard tests under 1100 °C, the changes of RI/I10600 for different cokes are very different at 1300 °C, and the changes are greatly related to coke optical texture. Under a high temperature in the testing method, the tumbling strength of cokes with more isotropy increased, whereas it decreased for those with less isotropy. This simple method of using high temperature could yield the same results when compared with complicated simulated blast furnace conditions.

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“…For detailed investigations of metallurgical coke by optical microscope (including an automated texture analysis, 10 Raman microscope, 11 scanning electron microscope (SEM/FESEM), 9 and electron microprobe (EPMA), 12 we use three types of coke samples, 13 including ( Mounted polished sections were prepared with low-viscosity epoxy resin and a single side of the section was carefully polished according to a procedure reported earlier. 13 Unmounted polished section pieces were cut from both sides and their typical size was 25x25x10 mm.…”

Section: (2) Experimentalmentioning

confidence: 99%

“…We reported recently [10] that the addition of high density polyethylene (HDPE) to coking coals can cause the appearance of rounded (50 µm) and elliptic (50 x 200 µm) pores surrounded by anisotropic (highly reactive) carbon in experimental coke. It means that the porosity can be partly controlled by the addition of HDPE and, consequently, it will have an effect on the strength of the coke.…”

Section: Place For Figurementioning

confidence: 99%

Effect of micro-pores on cracks formation in metallurgical coke

Gornostayev

Heino

Fabritius

2017

Canadian Metallurgical Quarterly

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The relationships of micro-pores and cracks in metallurgical coke have been investigated by optical microscope and FESEM, using surface section samples. The pores have circular, elliptical and irregular shapes with smooth outlines, formed during the thermoplastic stage of the coking process. They often associate with connecting cracks between neighbouring pores. In case of elliptical pores, the connecting cracks are usually oriented along the longer axis of the pore. The connecting cracks can be developed between the pores, depending on their size and the distance between them. The coke with a large number of small pores rather than with a small number of larger pores will have lower strength due to the increased amount of connecting cracks. When compared to circular pores, elliptical and flattened pores have a lower ability to resist load pressure. Nano-sized pores have polygonal outlines, indicating an "explosion"-type formation in the solidified matrix.

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Textural changes in metallurgical coke prepared with polyethylene

Cited by 6 publications

References 17 publications

Effect of Charcoal and Kraft-Lignin Addition on Coke Compression Strength and Reactivity

Effect of Charcoal and Kraft-Lignin Addition on Coke Compression Strength and Reactivity

A Simple Method of Evaluating the Thermal Properties of Metallurgical Cokes under High Temperature

Effect of micro-pores on cracks formation in metallurgical coke

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