Effects of Porosity and Electrical Resistance of Metallurgical Coke and Semicoke on Silicon Recovery in an Electric Arc Furnace

Hasannezhad, Hossein; Meysami, Amirhossein

doi:10.1007/s11837-018-3172-x

Cited by 5 publications

(7 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, the presence of wood chips has a positive effect on improving the energy factor. Therefore, the high reactivity of semi-coke is explained by the greater porosity and internal specific surface area of the material compared to coke and especially graphite (Apparent porosity of semi-coke 12.58% and coke 3.37%) [ 24 ]. Semi-coke has a highly branched internal structure and is even more than the original coal.…”

Section: Resultsmentioning

confidence: 99%

“…Due to the higher porosity of the semi-coke, the transfer of SiO gas from the particles is easy and increases its reactivity and furnace efficiency. In addition, at all temperatures, the specific electrical resistance of semi-coke is more than metallurgical coke [ 24 ]. Therefore, the presence of semi-coke increases Si recovery, improves furnace efficiency, and reduces electrical energy consumption [ 24 ].…”

Section: Resultsmentioning

confidence: 99%

“…In addition, at all temperatures, the specific electrical resistance of semi-coke is more than metallurgical coke [ 24 ]. Therefore, the presence of semi-coke increases Si recovery, improves furnace efficiency, and reduces electrical energy consumption [ 24 ]. Comparing COM6 with COM1, where charcoal is used instead of coke, the energy factor is slightly reduced.…”

Section: Resultsmentioning

confidence: 99%

“…The most important influencing parameters of carbon materials on Si recovery are porosity, electrical resistance, and percentage of aluminum oxide in ash. These parameters are affected by other factors [ 24 ]. For example, the amount of porosity and temperature affect the electrical resistance.…”

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

The effect of different carbon reductants on the production of ferrosilicon 75% on an industrial scale in an electric arc furnace

Etemadi

Koohestani

Tajally

2023

Heliyon

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

The effect of different carbon reductants on the production of ferrosilicon 75% on an industrial scale in an electric arc furnace

Etemadi

Koohestani

Tajally

2023

Heliyon

View full text Add to dashboard Cite

“…Many studies have been published on the resistivity of carbon materials [9][10][11][12][13][14][15][16][17][18]. In general, it is accepted that resistivity decreases with increasing temperature for the materials in the Si/FeSi furnace.…”

Section: Introductionmentioning

confidence: 99%

Bulk Resistivity of Materials in the Si/FeSi Furnace

et al. 2023

View full text Add to dashboard Cite

The formation of silicon carbide (SiC) and the energy distribution in the furnace are two important parameters in evaluating furnace operations. The energy distribution is determined by the resistivity of the materials in the furnace. This work aims to investigate the bulk resistivity of materials in the silicon (Si) furnace using both partially transformed carbon materials and raw charge mixes. In this study, the impact of temperature, SiC and Si content, and the addition of insulating charge materials are investigated up to 1600 °C using carbon materials as a base. The materials were treated under similar conditions to the industrial furnace. The resistivity of the carbon materials was between 7 and 17 mΩm at 1600 °C, where the char and coal were generally more conductive than the charcoal. The resistivity of partially transformed materials increased with conversion to SiC, and coal with a higher SiC content than 60% had an average resistivity at 1600 °C of around 30 mΩm. The resistivity then began to decrease as elemental Si formed in the pores. Up to 36%, the amount of Si did not affect the measured resistivity, but its presence likely causes a slight decrease. Computed tomography (CT) scans show that the SiC material is not visibly changing or transforming in the crucible during measurement. Comparing the SiC materials to carbon materials and SiC crust from the literature shows that partially transformed SiC will be as conductive or less conductive than carbon at high temperatures. At 1400 °C, the resistivity of the charge mixes that included char, quartz, woodchips, and silica–iron ore showed that the resistivity is directly proportional to the amount of the main conductive material, in this case, char. Temperature, transformation to SiC, and volume of conductive materials appear to influence the resistivity most heavily in this work. At higher temperatures, the effect of SiC content and heat treatment temperature is lessened as the range becomes smaller for these materials.

show abstract