Influence of Calcination Temperature and Sulfur Level on Coke Properties

Buzunov, Victor; Mann, Victor; Khramenko, S. A.; Johnson, John Asher

doi:10.1007/978-3-319-51541-0_138

Cited by 3 publications

(2 citation statements)

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“…According to these data, the time of vibro compaction and pitch content are the most important parameters to limit the pores inferior at 40 µm. In addition, Buzunov et al [51] reported that heating rate during coke calcination process determines pore size distribution in a calcined coke, which may in turn affect pore size distribution of the anode. Having said that, this suggestion is only based on the air reactivity tests as performed in this study.…”

Section: Active Pore Sizementioning

confidence: 99%

Evolution of Anode Porosity under Air Oxidation: The Unveiling of the Active Pore Size

Chevarin

Ishak

Ziegler

et al. 2017

Metals

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Abstract:The carbon anode, used in aluminum electrolysis (Hall-Héroult process), is over-consumed by air oxidation and carboxy-reaction (with CO 2 ). Several anode features may affect this over-consumption, such as impurity content, graphitization level and anode porosity features (e.g., porosity volume fraction or pore size distribution). The two first parameters are basically related to the quality of raw materials and coke calcination conditions. Anode porosity is, however, greatly affected by anode manufacturing conditions, and is possible to be modified, to some extent, by adjusting the anode recipe and the processing parameters. This work aims to investigate the effect of anode porosity on its air reactivity. Baked anode samples were prepared in laboratory scale and then crushed into powder form (−4760 + 4000 µm). The recipe for anode preparation was similar to a typical industrial recipe, except that in the lab scale no butt particles were used in the recipe. Anode particles were then gasified at six different conversion levels (0, 5, 15, 25, 35 and 50 wt %) under air at 525 • C. The porosity was characterized in several pore size ranges, measured by nitrogen adsorption and mercury intrusion (0.0014-0.020, 0.002-0.025, 0.025-0.100, 0.1-40.0 and superior at 40 µm). The volume variation of each pore range, as a function of carbon conversion, was assessed and used to determine the size of the most active pores for air oxidation. The most active pore size was found to be the pores inferior at 40 µm before 15 wt % of gasification and pores superior at 40 µm between 15 and 50 wt % of carbon conversion. Limitation of pore size range could be used as an additional guideline, along with other targets such as high homogeneity and density, to set the optimum anode manufacturing parameters.

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Section: Active Pore Sizementioning

confidence: 99%

Evolution of Anode Porosity under Air Oxidation: The Unveiling of the Active Pore Size

Chevarin

Ishak

Ziegler

et al. 2017

Metals

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“…The fixed carbon content of petroleum coke is usually above 80%, which increases the residual carbon content in the combustion products, and the ash content of petroleum coke is less than 1.2%, which is beneficial to reduce the material basis for the formation of rotary kiln deposits [15]. Because of the relatively high sulfur content, the additive amount of petroleum coke needs to be limited [16].…”

Section: Introductionmentioning

confidence: 99%

The Deposit Formation Mechanism in Coal-Fired Rotary Kiln for Iron Ore Pellet Production: A Review

Wang

Guo

et al. 2021

Crystals

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The deposit-forming problem is one of the main bottlenecks restricting the yield and production benefit of iron ore pellets produced by coal-fired rotary kilns. In order to implement measures to ensure the efficient production of pellets by coal-fired rotary kilns, the mechanism and influencing factors on the deposit formation were reviewed. The pellet powder and coal ash come together to form the material base of the deposit. Meanwhile, the local reducing atmosphere caused by the continued combustion of residual carbon increases the FeO content, resulting in the formation of low-melting-point silicates. Moreover, alkali metal elements in coal ash can also promote liquid phase formation to cause serious deposit aggregation problems. During high-temperature roasting, the liquid phase corrodes the surface of the refractory brick to form the initial deposit, whereafter, it binds the pellet powder and coal ash from the material layer, which causes the deposit to accumulate continuously. The deposit formation of coal-fired rotary kilns is the result of interaction between many factors, which includes the quality of the green pellets, the composition of coal ash, the combustion efficiency of pulverized coal, roasting temperature, FeO content and alkali metal input. Finally, it is recommended that some measures to mitigate deposit formation can be adopted, such as increasing the compression strength of preheated pellets, choosing high-quality raw materials with low alkali metals, improving the combustion of pulverized coal.

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Determination of Trace Metals by ICP-OES in Petroleum Cokes Using a Novel Microwave Assisted Digestion Method

et al. 2022

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Influence of Calcination Temperature and Sulfur Level on Coke Properties

Cited by 3 publications

References 1 publication

Evolution of Anode Porosity under Air Oxidation: The Unveiling of the Active Pore Size

Evolution of Anode Porosity under Air Oxidation: The Unveiling of the Active Pore Size

The Deposit Formation Mechanism in Coal-Fired Rotary Kiln for Iron Ore Pellet Production: A Review

Determination of Trace Metals by ICP-OES in Petroleum Cokes Using a Novel Microwave Assisted Digestion Method

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