Effect of Carbonisation Conditions on Mineral Matter in Coke

Grigore, Mihaela; Sakurovs, Richard; French, David; Sahajwalla, Veena

doi:10.2355/isijinternational.47.62

Cited by 19 publications

(23 citation statements)

References 15 publications

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“…The EDX semi-quantitative analysis of this coke converted to oxides in mineral matter (Table 3) shows a clear prevalence of Al 2 O 3 that had along with SiO 2 a major presence, in different ratios, also in other found coke breeze residues. Such presence of components is in agreement with the general nature of coke the mineral components of which are of the strongly acidic nature [11]. The ratio of CaO in the coke mineral matter varies but normally it is very low.…”

Section: Sinters Prepared Using Charcoalsupporting

confidence: 67%

Phase Composition of Iron Ore Sinters Produced with Biomass as a Substitute for the Coke Fuel / Skład Fazowy Spieków Żelaza Wytworzonych Z Dodatkiem Biomasy Jako Zamiennika Dla Koksu

Mežibrický¹,

Fröhlichová²,

Mašlejová³

2015

Archives of Metallurgy and Materials

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The effort to minimize CO2 emissions leads the existing integrated steel plants to implement alternative biomass-based fuels that dispose of equilibrium carbon balance. The fuel is a key factor in the iron ore sinter production, so it is essential to know its impact not just on mechanical properties of the finished sintered ore but also on the mineral composition as the mineral phases together determine all observed sinter properties. For this purpose the samples prepared by replacing a part of coke breeze with charcoal or walnut shell substitute were subjected to the observation under the light microscope, also using etching, to the phase identification by chemical EDX analysis on the scanning electron microscope and to the phase composition quantification by X-Ray diffraction analysis. The studied microstructure areas in the vicinity of the pores left by fuel grains were neither characterized by different phases nor by changed chemical composition of these phases even thought mineral matter of the used fuels were substantially different in terms of the chemical composition. The only feature of the burned substitute fuels were ash particles arranged in characteristic shapes. The main reason of variation in ratios of respective mineral phases of samples appeared to be thermal conditions that were reflected in the content of unreacted non-ferrous phases. Coke substitution in the sinter mixture has no negative impact on the phase composition of the produced sinters, which confirms the prospective use of biofuels in the sintering process.

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Section: Sinters Prepared Using Charcoalsupporting

confidence: 67%

Phase Composition of Iron Ore Sinters Produced with Biomass as a Substitute for the Coke Fuel / Skład Fazowy Spieków Żelaza Wytworzonych Z Dodatkiem Biomasy Jako Zamiennika Dla Koksu

Mežibrický¹,

Fröhlichová²,

Mašlejová³

2015

Archives of Metallurgy and Materials

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“…10-12 were designed to match the composition of mullite (No. [13][14][15]. Similarly, the alumina-silica ratios in combinations No.…”

Section: Mineralsmentioning

confidence: 95%

“…12) Further, when the analogue was produced using coke ash as the mineral component, it was found that the reactivity of coke analogue was similar to that of the cokes used to make the ash. 13,14) Quartz is one of the most commonly found minerals in cokes, 6,15,16) and has also been shown to reduce the reactivity of coke under CRI conditions. 6,7) Aluminosilicate minerals are also commonly found in cokes, 6,10,11,15,16) often having been present in the parent coals as clay.…”

Section: Introductionmentioning

confidence: 99%

“…13,14) Quartz is one of the most commonly found minerals in cokes, 6,15,16) and has also been shown to reduce the reactivity of coke under CRI conditions. 6,7) Aluminosilicate minerals are also commonly found in cokes, 6,10,11,15,16) often having been present in the parent coals as clay. These aluminosilicates within coke have varying compositions, with different proportions of alumina and silica.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Simple and Complex Minerals in the Alumina-Silica-Magnetite Ternary System on Coke Analogue Reactivity

et al. 2021

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The effect of combinations of minerals in the alumina-silica-magnetite ternary system on the reactivity of coke analogues with CO 2 at 1 100°C in a pseudo-CRI test. The reactivity of coke analogue was found to be largely linearly related to the proportions of each mineral in the alumina-quartz-magnetite ternary system. It was found that quartz decreased the reactivity of the coke analogue, alumina had little effect, while magnetite increased the reactivity. The effect of minerals in the pseudo-binary combinations of mullite-magnetite and kaolinite-magnetite was found to be similar to the effect of the simple alumina-quartz-magnetite ternary combination with the equivalent composition, i.e. the minerals of different phases but the same composition had the same effect on the reactivity of the coke analogue. Pre-and post-experimental characterisation confirmed the mineral (aluminosilicates, quartz and alumina) phase did not change and that they remained as separate particles. It was also shown the effect on minerals with compositions in the alumina-silicamagnetite system on coke reactivity can be considered to be linearly related to the composition of the coke mineral. As such, the reactivity of coke under CRI conditions may be predicted based on a simple ash composition analysis for the alumina-silica-magnetite ternary system. This supports the often used practice of using relations between reactivity and coke ash composition for the prediction of measures of coke performance such as CRI, for minerals in the alumina-silica-magnetite system.

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“…Studies have also been reported7–9 in which coke ash mineralogical composition is analysed by X‐ray diffraction (XRD), with a view to finding a relationship between the ashes and coke reactivity. No studies are available in the literature, however, in which a complete chemical characterisation is performed of petroleum cokes by a simple, rapid, and reliable method that could be readily used as a control method.…”

Section: Introductionmentioning

confidence: 99%

Methodology for the determination of minor and trace elements in petroleum cokes by wavelength-dispersive X-ray fluorescence (WD-XRF)

et al. 2010

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This article describes a methodology for the analysis of minor and trace elements in petroleum cokes by wavelength-dispersive X-ray fluorescence (WD-XRF) spectrometry. The methodology was developed in order to have a rapid and reliable control method of these elements, because they determine coke end uses. There are a number of standard methods of chemical analysis by WD-XRF or inductively coupled plasma atomic emission spectrometry (ICP-OES) techniques. However, the standards that use WD-XRF measurement give detection limits (L D ) above 10 mg·kg −1 and only analyse a few elements of interest, whereas the ICP-OES method requires extensive sample handling and long sample preparation times, with the ensuing errors. In order to improve the method described in the standard ASTM D6376 and reach the L D and quantification limits (L Q ) required, the different stages of the process, ranging from sample preparation to measurement conditions: analytical line, detector, crystal, tube power, use of primary beam filters, and measurement time, were optimised. The samples were prepared in the form of pressed pellets, under conditions of high cleanliness of the mills, crushers, presses, and dies, and of the laboratory itself. The following reference materials were used in measurement calibration and validation: SRM 1632c, SRM 2718, SRM 2719, SRM 2685b, AR 2771, AR 2772, SARM 18, SARM 19, and CLB-1. In addition, a series of materials were analysed by WD-XRF and ICP-OES, and the results were compared. The developed methodology, which uses WD-XRF, is rapid and accurate, and very low L D and measurement uncertainties were obtained for the following elements: Al,

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Effect of Carbonisation Conditions on Mineral Matter in Coke

Cited by 19 publications

References 15 publications

Phase Composition of Iron Ore Sinters Produced with Biomass as a Substitute for the Coke Fuel / Skład Fazowy Spieków Żelaza Wytworzonych Z Dodatkiem Biomasy Jako Zamiennika Dla Koksu

Phase Composition of Iron Ore Sinters Produced with Biomass as a Substitute for the Coke Fuel / Skład Fazowy Spieków Żelaza Wytworzonych Z Dodatkiem Biomasy Jako Zamiennika Dla Koksu

Effects of Simple and Complex Minerals in the Alumina-Silica-Magnetite Ternary System on Coke Analogue Reactivity

Methodology for the determination of minor and trace elements in petroleum cokes by wavelength-dispersive X-ray fluorescence (WD-XRF)

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