Influence of ore formation on the mineral composition and strength of fluxed iron-ore sinter

Malysheva, T. Ya.; Pavlov, R. M.; Mansurova, N. R.; Detkova, T. V.

doi:10.3103/s0967091215030134

Cited by 5 publications

(3 citation statements)

References 5 publications

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“…The method of experimental determination of materials phase composition via X-ray, petrographic or other instrumental analytical method is the most widely distributed technique. E.g., mastering of the pelletizing technology for iron ores in CIS countries is mainly based on these methods [6]. However, designing of the new technological process, which considers tens and hundreds of kinds of new ores and fluxes for determining their optimal correlation, requires essential material and temporal expenses.…”

Section: Introductionmentioning

confidence: 99%

The method of mathematical description of the phase composition diagrams

Akberdin¹,

Kim²,

Sultangaziev³

et al. 2023

cisisr

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The method for the mathematical description of phase composition diagrams has been developed. It is based on the balance of distribution of the initial components of the slag or metal over the secondary compounds (phases) formed from them. The equations relating the phase composition to the chemical one are obtained, and a computer program is created on their basis. After setting the chemical composition of the slag from the console and starting it, the computer outputs the phase composition in mass percent, the number of the polytope, its volume, initial and final equations. The method has no restrictions on the number of components considered in the system under study and allows describing five or more component systems that cannot be correctly displayed in three-dimensional space on a plane. Examples of using the model are given. Calculations using the obtained model established that deterioration in the production of carbonaceous ferrochromium from Kazakh ores is due to the movement of slags within the SiO 2 -Al 2 O 3 -MgO triple diagram from the region of magnesia spinel (MgOAl 2 O 3 ) to the region of predominant forsterite crystallization (2MgOSiO 2 ) during transition to use of magnesia ores. A predictive estimation of the phase composition of steel-smelting slags with high basicity is given. It was found out that, on average, they contain high-temperature compounds such as periclase (MgO), dicalcium silicate (Ca 2 SiO 4 ), calcium monoaluminate (CaAl 2 O 4 ), and magnesia spinel (MgAl 2 O 4 ) as phase components. All of them are high-temperature compounds, which determine refractoriness of the slag. Presence of Ca 2 SiO 4 in the slag in a large amount (74 %), capable of polymorphic transformation with a volume change by 12 %, can cause decomposition of slags with formation of dispersed dust, which is hazardous to the environment. The calculation results are confirmed by X-ray phase analysis of the slag. The proposed mathematical model also allows solving inverse problems, i.e. to find the composition of the charge to obtain a product with the desired phase composition. It is recommended to load charge containing 68.48 % CaO, 25.10 % SiO 2 and 6.43 % Al 2 O 3 into the kiln to obtain high quality white Portland cement clinker with the following composition: 45 % of 3CaOSiO 2 , 38 % of 2CaOSiO 2 and 17 % of 3CaOAl 2 O 3 .

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Section: Introductionmentioning

confidence: 99%

The method of mathematical description of the phase composition diagrams

Akberdin¹,

Kim²,

Sultangaziev³

et al. 2023

cisisr

View full text Add to dashboard Cite

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“…The equilibrium phase relation presented by a phase diagram is of fundamental importance for the development of material and process design [1]. During the production of steel from iron ore, the processing parameters-i.e., the temperature, composition and oxygen partial pressure-are basically determined according to phase diagrams, such as the Fe t O-SiO 2 -based system for sinter production [2], the CaO-SiO 2 -based and CaO-SiO 2 -MgO-Al 2 O 3 -based systems for the design of furnace and converter smelting slag [3], the Fe-C-based systems for heat treatment [4,5], and the CaO-SiO 2 -MgO-Al 2 O 3 -TiO 2 system for the comprehensive utilization of titania-bearing slag [6,7], etc. It is now well known that the thermodynamic properties of the slag have a significant influence on the metalslag reaction, crystallization, inclusion formation, oxidation, and degasification, etc.…”

Section: Introductionmentioning

confidence: 99%

Equilibrium Phase Relations for a SiO2-Al2O3-FeOx System at 1300 °C and 1400 °C in Air

Qiu

Shi

et al. 2022

Metals

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A long-term fundamental study for the construction of the thermodynamic database of a metallurgical slag system has been proposed. In the present work, the equilibrium phase relations for the key ternary SiO2-Al2O3-FeOx system at 1300 °C and 1400 °C in air were experimentally determined by the equilibrium-quenching technique, followed by X-ray Photoelectron Spectroscopy and Scanning Electron Microscope equipped with an Energy Dispersive X-ray Spectrometer analysis. The oxidation states of Fe2O3 and Fe3O4 were confirmed at 1300 °C and 1400 °C, respectively, from both XPS detection and FactSage calculation. Within the high-SiO2 composition range, the solid phases of silica, mullite, magnetite and ferric oxide were confirmed as the equilibrium phases. Based on the equilibrium compositions, the 1300 °C and 1400 °C isotherms were projected onto a SiO2-Al2O3-FeOx quasi-ternary phase diagram; however, obvious discrepancies with about a 20 °C difference were confirmed from further comparison with the predictions given by FactSage, indicating that more efforts are needed for the updating of the current thermodynamic database relating to metallurgical slag oxide systems.

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“…В работе [14] отмечено влияние основности агломерата на его прочность (фракция +6,3 мм). Установлено, что при основности агломерата ОАО «Магнитогорский металлургический комбинат» 1,4 его прочность составляет 61 %, при основности 1,6 - 56 %, при основности 3,0 - 69 %.…”

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Analytical Study of Quality Influence of Titanomagnetite Raw Materials on Blast Furnace Indicators

Dmitriev¹

2017

Izv. vysš. učebn. zaved., Čern. metall.

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Аннотация. Приведено краткое описание математических моделей доменного процесса и методики оценки количественного влияния металлургических характеристик железорудного сырья и кокса на технико-экономические показатели доменной плавки, разработанных в Институте металлургии УрО РАН. Основными особенностями для данных математических моделей являются: для комплекса математических моделей-двумерность доменного процесса, заложенная при постановке задачи; для балансовой логико-статистической модели-возможность учета металлургических характеристик железорудного сырья (агломерат и окатыши) при анализе доменной плавки. Описана оригинальная методика оценки влияния показателей качества железорудного сырья и кокса на технико-экономические показатели доменной плавки. Суть этой методики заключается в следующем: исследование в лабораторных условиях металлургических характеристик железорудного сырья (восстановимость, прочность, температуры размягчения и плавления), определение с помощью математических моделей технико-экономических показателей доменной плавки, проведение опытно-промышленных и промышленных испытаний. Приведены результаты исследования влияния основности промышленного агломерата из титаномагнетитового концентрата на технико-экономические показатели доменной плавки. Представлены результаты литературных и собственных исследований по выявлению стабилизированной фазы двухкальциевого силиката SFCA. Понимание механизмов формирования таких фаз может привести к повышению эффективности промышленных процессов спекания. Для изучения минералогического состава агломератов был проведен микрорентгеноструктурный анализ с помощью растрового электронного микроскопа (Scanning Electron Microscope, SEM) JSM-5900LM. Выявлено наличие определенной взаимосвязи фазового состава агломерата и его горячей прочности. Согласно расчетам с использованием математической модели, повышение горячей прочности агломерата может дать экономию кокса до 3,9 кг/т чугуна и увеличение производительности до 6,3 %. Выполнена оценка влияния химического состава доменной шихты с учетом степени восстановления железа на положение и форму зоны когезии в доменной печи. Для расчета использованы прогнозные физико-химические модели, позволяющие учесть влияние химического состава железорудных материалов и их соотношений на температуры размягчения и плавления окускованного железорудного материала из титаномагнетитового концентрата.

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Influence of ore formation on the mineral composition and strength of fluxed iron-ore sinter

Cited by 5 publications

References 5 publications

The method of mathematical description of the phase composition diagrams

The method of mathematical description of the phase composition diagrams

Equilibrium Phase Relations for a SiO2-Al2O3-FeOx System at 1300 °C and 1400 °C in Air

Analytical Study of Quality Influence of Titanomagnetite Raw Materials on Blast Furnace Indicators

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