A Method for Evaluating Coke Hot Strength

Haapakangas, Juho; Uusitalo, Juha; Mattila, Olli; Kokkonen, Tommi; Porter, David; Fabritius, Timo

doi:10.1002/srin.201200078

Cited by 20 publications

(11 citation statements)

References 9 publications

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“…Additionally, compression tests have been used to measure coke strength [22][23][24][25]. In this work, a compression test was used to evaluate the cold strength of the bio-cokes.…”

Section: Cold Strength Measurementsmentioning

confidence: 99%

“…Cold strength tests were done with a Gleeble 3800 thermomechanical simulator (Dynamic Systems Inc., New York, NY, USA). The device has been previously used in coke hot strength measurements [24,25]. The coke cylinders obtained from laboratory coking experiments were cut into three samples.…”

Section: Cold Strength Measurementsmentioning

confidence: 99%

“…Furthermore, organically-associated sulfur in Kraft-lignin can be partially released in the carbonization stage [42], enhancing its metallurgical properties. In future studies, attention should be placed to the hot strength of the bio-cokes, as done in [24,25] for different coke grades.…”

Section: Implications On the Blast Furnace Process And Further Develomentioning

confidence: 99%

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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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“…Additionally, compression tests have been used to measure coke strength [22][23][24][25]. In this work, a compression test was used to evaluate the cold strength of the bio-cokes.…”

Section: Cold Strength Measurementsmentioning

confidence: 99%

Section: Cold Strength Measurementsmentioning

confidence: 99%

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

et al. 2017

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“…During previous work coke hot strength was measured for an individual coke grade and a significant decrease in strength was observed at 1600 °C in comparison to 1000 °C. Afterwards an even further decrease in strength was observed at 1750 °C.…”

Section: Resultsmentioning

confidence: 99%

“…After heating, compressive forces were measured while the samples were mechanically compressed 4 mm at the rate of 1 mm s −1 . The use of a Gleeble device for testing the hot strength of coke has been described in detail earlier . Industrial analyses provided by the coke manufacturers are displayed in Table and .…”

Section: Methodsmentioning

confidence: 99%

The Hot Strength of Industrial Cokes – Evaluation of Coke Properties that Affect Its High‐Temperature Strength

Haapakangas

Uusitalo

Mattila³

et al. 2014

steel research int.

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The strength of coke at high temperatures is of major importance for efficient blast furnace operation. Despite this, there is little information regarding the hot strength of coke. In this research, the hot strength of three industrial European coke grades was studied using a Gleeble thermomechanical simulator. The hot strength was analyzed at three different temperatures: room temperature, 1600 and 1750 8C by measuring the compressive strength of roughly 50 coke samples at each temperature. A significant decrease in strength was observed for all three coke grades at high temperatures. Notable differences between the coke grades in compressive strength were observed at room temperature. At high temperatures, differences were observed in strength and deformation behavior; however, the order of magnitude of strength remained the same. The deformation behavior at high temperatures was also studied and discussed based on stress-strain curves. Several structural properties of coke such as total porosity, pore size distribution, pore shape factor, amount of inerts, and degree of graphitization were determined in order to explain the obtained strength results. Both hot and room temperature compressive strength values were compared to industrial strength tests and discussed. The reliability of the results was evaluated with statistical analyses.[ Ã ] J. A. Haapakangas, S. S. Gornostayev, Prof. T. M. Fabritius

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Effect of Coal and Coke Ash on Blast Furnace Slag Properties: A Comparison Between Pulverized Coal, Charcoal, Fossil‐Based Coke, and Biocoke

Heikkilä

Iljana

Heikkinen

et al. 2021

steel research int.

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Blast furnace (BF) is the most used equipment for production of iron in the world. It is charged mainly with metallurgical coke and ferrous materials. When descending inside the BF, iron‐bearing materials start reducing and melting with other burden materials. This melting leads to the formation of so‐called primary slags from which the final slag is formed as materials descend inside the furnace. Each charge material has a unique effect on the total composition of the BF slag. Herein, the parts of the slag, which originate from ash of metallurgical coke and pulverized coal, and changes in the final slag compositions and properties are focused on. The global trend is to decrease the use of fossil‐based carbon by replacing it with bio‐based coal. Ash from coke and pulverized coal eventually dissolve in the final slag, affecting its properties. The purpose herein is to evaluate how BF slag composition changes when fossil‐based coke is replaced with biocoke and pulverized coal is replaced with charcoal. Based on mass balance calculations, these replacements have both increasing and decreasing effects on solidus and liquidus temperatures, viscosity, and CaO/SiO2 and MgO/Al2O3 ratios depending on the used replacement materials.

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A Method for Evaluating Coke Hot Strength

Cited by 20 publications

References 9 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

The Hot Strength of Industrial Cokes – Evaluation of Coke Properties that Affect Its High‐Temperature Strength

Effect of Coal and Coke Ash on Blast Furnace Slag Properties: A Comparison Between Pulverized Coal, Charcoal, Fossil‐Based Coke, and Biocoke

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