Mechanism of mineral formation and metallurgical properties of sinter of basicity 1.1–3.1 at OAO MMK

Malysheva, T. Ya.; Yusfin, Yu. S.; Mansurova, N. R.; Gibadulin, M. F.; Lekin, V. P.

doi:10.3103/s0967091207020118

Cited by 8 publications

(6 citation statements)

References 1 publication

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“…A small amount of glass phase distributes in the space between the SFCA and magnetite. As well known, increasing quantity of SFCA benefits the cold strength of product sinter [9,[11][12][13].…”

Section: Mineralogy Of Product Sinter With Different Mgo and Basicitymentioning

confidence: 99%

“…Sinter quality mainly depends on the liquid phase consolidation, which could be affected by various factors. In earlier and recent years, considerable attentions were focused on the MgO content and basicity (CaO/SiO 2 ) of sinter because of their important effect on the quality of the bonding phase, mineral compositions, formation mechanism and various physicochemical properties of product sinter [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…Off-line studies and operating results in sinter plants show increasing MgO content has controversial effect on the sinter quality and reducibility [4][5][6][7][15][16][17]. Some researchers also have already studied the effect of basicity on the sintering properties of iron ore [8,9]. They found an anomalous drop in cold strength of sinter occurred within the basicity range 1.0-2.0, due to the presence of Ca 2 SiO 4 and the multiple phases in the mineralogical composition of sinter.…”

Section: Introductionmentioning

confidence: 99%

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Combined effect of MgO and basicity varied by different dolomite and burnt lime addition on sintering performance of magnetite concentrates

Shi

Zhu

Pan

et al. 2019

Ironmaking & Steelmaking

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In this paper, the combined effects of MgO and basicity (CaO/SiO 2 ), varied by changing the ratio of dolomite and burnt lime to sinter mix, on sintering of magnetite concentrates were investigated in pilot scale. Mineralogy of sinter with various MgO and basicity was analyzed by light microscope and scanning electron microscope (SEM). The results show that increasing MgO led to lower sinter strength and higher fuel consumption, while increasing basicity behaved in the opposite way. Regardless of MgO content, minimum sinter strength occurred in basicity 1.2-1.6, which should be avoided in sinter production. Less SFCA (silicoferrites of calcium and aluminum) and more magnetite were observed in sinter with higher MgO content. Aside from hematite and magnetite, the dominant phases in sinter with low (0.8) and high (2.2+) basicity were glass and SFCA respectively. Sinter with basicity 1.6 had highest crack density and this would inevitably reduce its cold strength.

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Section: Mineralogy Of Product Sinter With Different Mgo and Basicitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Combined effect of MgO and basicity varied by different dolomite and burnt lime addition on sintering performance of magnetite concentrates

Shi

Zhu

Pan

et al. 2019

Ironmaking & Steelmaking

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“…As sinters assumed the role of the blast-furnace charge basicity regulators, they are generally produced with a substantial addition of CaO -based additives. Calcium ferrites thus became a common part of today's sinters while their type and ratio varies with increasing addition of basic additives [8][9].…”

Section: Introductionmentioning

confidence: 99%

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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“…A partir da magnetita, a redução é topoquímica e quase todos os grãos são rapidamente cercados pelo metal que neste caso retarda futuras reações de redução Conforme salientado por Loo [14], o teor de FeO é utilizado como um indicador para os valores dos índices de redutibilidade e RDI [4]. De acordo com Malysheva [15] a redutibilidade do sinter é maior na faixa de basicidade compreendida entre1,5 e 2,3, conforme mostrado pela Figura 3.…”

Section: Redutibilidadeunclassified

Instalação De Forno Para Ensaios De Redutibilidade (Ri) E Desintegração Após Redução À Baixa Temperatura (Rdi)

Campos¹,

Fonseca²,

Correia³

et al. 2014

ABM Proceedings

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sob Redução), pode-se determinar a geração de finos durante a redução da carga metálica no alto-forno, e com o RI (Índice de Redutibilidade) determina-se a capacidade do sínter em ceder oxigênio para o gás redutor. São ensaios de extrema importância, pois com o RDI é possível medir a degradação do sínter quando submetido a condições redutoras do alto-forno, e com o RI entende-se o grau de redução da carga metálica momentos antes do início de seu processo de amolecimento. Com a instalação deste forno no Laboratório de Redução da CSN, será possível correlacionar os componentes do sínter, e de outras cargas metálicas, avaliando suas influências no produto, e, consequentemente, em suas utilizações no alto-forno. Palavras-chave: Ensaio; RI; RDI; Minério. FURNACE INSTALLATION FOR TESTING OF REDUCIBILITY (RI) AND LOW-TEMPERATURE REDUCTION-DISINTEGRATION INDICES (RDI) AbstratWith the RDI test (Low-Temperature Reduction-Disintegration Indices), it´s possible to determine the fines generation during the reduction of the metal charge in the blast furnace, and, with RI test (Reducibility Index) determines the capacity of the sinter in giving oxygen to the reducing gas. These tests are extremely important because with RDI it´s possible to measure the sinter degradation when subjected to reducing conditions of the blast furnace, and RI refers to reduction degree of the metal load moments before the start of the softening process. With the installation of this furnace in CSN´s Reduction Laboratory, it will be possible correlate the sinter´s components, and other metallic fillers, evaluating its influences on the product, and hence their use in the blast furnace.

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Mechanism of mineral formation and metallurgical properties of sinter of basicity 1.1–3.1 at OAO MMK

Cited by 8 publications

References 1 publication

Combined effect of MgO and basicity varied by different dolomite and burnt lime addition on sintering performance of magnetite concentrates

Combined effect of MgO and basicity varied by different dolomite and burnt lime addition on sintering performance of magnetite concentrates

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

Instalação De Forno Para Ensaios De Redutibilidade (Ri) E Desintegração Após Redução À Baixa Temperatura (Rdi)

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