Comparison of sintering performance of typical specular hematite ores with distinct size distributions

Chao, Yang; Zhu, Deqing; Shi, Benjing; Pan, Jian; Lü, Liming; Li, Xiaobo; Mo, Yaping

doi:10.1016/s1006-706x(17)30147-4

Cited by 11 publications

(9 citation statements)

References 12 publications

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“…Other authors investigated the use of concentrates and pellet feed, which were previously pre-treated in roller press aiming to increase its specific surface, in sintering process showing that the pre-treatment allows to use these materials without losing process permeability. [14][15][16] Those findings were recently reinforced by Yang et al 2) who investigated different size distribution of specular hematite ore types and Oliveira et al 17) whom reported that it was also possible to replace coarse sinter feeds without losing productivity.…”

Section: Granulation Behavior Of An Iron Ore Sintering Mixture Contaimentioning

confidence: 92%

“…Vinícius de Morais OLIVEIRA, 1) * Alei Leite Alcantara DOMINGUES, 1) Mauricio Covcevich BAGATINI 2) and Valdirene Gonzaga de RESENDE 1) 1) Ferrous Technology Center, Vale S.A., Nova Lima, MG, Brazil. High-grade iron ores became more attractive due to the searching for lower slag rate operation in blast furnaces aiming to reduce CO 2 emissions as the environmental regulation became even more restricted.…”

Section: Granulation Behavior Of An Iron Ore Sintering Mixture Contaimentioning

confidence: 99%

“…Recently, due to the increase of fine portion of the sinter feeds and also the availability of concentrates, such as pellet feeds, this step played an important role to guarantee good permeability conditions for sintering process. 1,2) Granulation is the term used to name the process of increasing particle size to a certain optimal size with spherical shape by using fine and very fine particles. According to Walker 3) the granulation happens when a bed of solid particles moves with simultaneous intensive mixing in the presence of a liquid phase.…”

Section: Introductionmentioning

confidence: 99%

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Granulation Behavior of an Iron Ore Sintering Mixture Containing High Grade Pellet Feed with Different Specific Surface

et al. 2020

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Section: Granulation Behavior Of An Iron Ore Sintering Mixture Contaimentioning

confidence: 92%

Section: Granulation Behavior Of An Iron Ore Sintering Mixture Contaimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Granulation Behavior of an Iron Ore Sintering Mixture Containing High Grade Pellet Feed with Different Specific Surface

et al. 2020

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“…The above results further emphasize the importance of reasonable size distribution of feed mix to achieve desirable granulation effectiveness and packed bed permeability. 31) In addition, the results also raise a particular concern on the applicability of the model to the granulation process of AO-F and BO-T. Figure 7(c) shows the plot of x 0.5 with (1−ε) S/εd for different ores. Generally, x 0.5 is found to decrease with increase of (1−ε)S/ε d .…”

Section: Factors Affecting the Granulation Effectivenessmentioning

confidence: 98%

Granulation Effectiveness of Iron Ore Sinter Feeds: Effect of Ore Properties

et al. 2018

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This paper developed a quantitative understanding of the effect of ore properties on granulation effectiveness for different iron ore types based on the mechanistic model proposed by J.D. Litster et al. The granulation effectiveness was measured by the magnitude of x 0.5 , which was postulated to be a function of the layer binding strength. Water was adopted as the only binder for all granulation tests. A wide range of moisture contents, up to the optimum moisture content that yielded an optimum permeability, was tested for each ore type. The typical structure of granules made from different ores was investigated to reveal the effect of mineralogical properties of ore particles on the growth of granules. The results indicate that the granulation effectiveness x 0.5 varies markedly with ore type and moisture content. Feed particle size distribution and moisture for granulation are paramount factors determining the granulation effectiveness x 0.5 , which has a single relationship with the mass mean size of layering particles independent of ore type. The mass mean size of layering particles is dependent on the inherent size distribution of raw materials and the mass fraction of layering particles, while the latter is linear to available moisture content. The model works well for some ore types except for those with unreasonable size distributions: 1) excessive intermediate particles meanwhile lacking of fine particles; or 2) excessive ultrafine particles. An effective criteria closely related to layer binding strength, (1 − ε)S/ε d , is proposed to determine the applicability of the model.

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“…Magnetite, magnesium ferrite and silicate increased with the increase of MgO content. Yang et al studied the effect of typical specular hematite ores with distinct size distributions on the sintering performance, and found that the size distribution of iron ore could influence the performance of sintering: the ore of intermediate size displayed an inferior sintering performance; However, the metallurgical performance of sinter could be improved by mixing with other size distribution ores [8]. Zhang et al evaluated the effect of SiO2 in the ore on the metallurgical performance of sinter.…”

Section: Introductionmentioning

confidence: 99%

Influence of iron ore concentrate on the characteristics of sintering and reduction of sinter

Guo

Feng

Jiang

et al. 2020

J min metall B Metall

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As Australia is the main iron ore importing country for China, the abundant mineral resources of Australia are the primary raw materials for the sintering process. To better understand the properties of different iron ores from Australia and then guide the sintering process, this study selected four types of Australian ore and one type of domestic ore, and their properties were investigated under different conditions. The experiment of single iron ore sintering was studied to examine the influence of different iron ores on the metallurgical properties of sinter. From this study, the following results were obtained: GG showed poor fluidity and higher assimilability temperature, but the bonding phase strength was the highest; YD showed better fluidity and lower assimilability temperature, whereas SJY (domestic ore) showed better fluidity and higher bonding phase strength, and lower assimilability temperature. The influence mechanism of iron ore on the fluidity was further analyzed by using SEM and ion theory of slag. With the increase SiO2 content of iron ore, the fluidity index increased, the main reason was that the amount of liquid phase increased and the melting point decreased during the sintering. However, an excessive amount of SiO2 caused the decrease of fluidity index of iron ore; the main reason was that the fluidity of the liquid phase itself decreased and secondary hematite appeared. In the case of the higher SiO2 content of iron ore, the main bonding phase was calcium silicate. With the decrease of SiO2 content, the calcium silicate transformed into calcium ferrite. The main reason for this was that the Gibbs free energy of calcium ferrite and dicalcium ferrite (2CaO?SiO2) was higher than that of calcium silicate in the temperature ranges of 400-1600 K. The reduction degree of YD was the highest in all the cases and that of GG was the lowest. Activation energies of 5.39, 3.14, 3.51, 4.47 and 2.92 kJ/mol were obtained for the reduction of GG, PB, BH, SJY, and YD, respectively. In all the cases, the reaction corresponded to the model function of F1(?), and the integral form was -ln(1-?)=kt. Through this investigation, it could be concluded that the most appropriate ore category for sinter pot was YD.

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Comparison of sintering performance of typical specular hematite ores with distinct size distributions

Cited by 11 publications

References 12 publications

Granulation Behavior of an Iron Ore Sintering Mixture Containing High Grade Pellet Feed with Different Specific Surface

Granulation Behavior of an Iron Ore Sintering Mixture Containing High Grade Pellet Feed with Different Specific Surface

Granulation Effectiveness of Iron Ore Sinter Feeds: Effect of Ore Properties

Influence of iron ore concentrate on the characteristics of sintering and reduction of sinter

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