Fundamental Study of Size Degradation Mechanism of Agglomerates during Reduction

Shigaki, Ichiro; Sawada, Mineo; Maekawa, Masahiro; Narita, Kiichi

doi:10.2355/isijinternational1966.22.838

Cited by 25 publications

(13 citation statements)

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“…Calcium ferrite is the major mineral constituent of the sinter structure and it imparts strength to the sintered mass. High content of calcium ferrites favors the tumbler strength of the sinter [15,16]. From the test results it was found that maximum 2.5 to 3.0 % (30 to 35kg/t of sinter) HMDS Slag can be used in the sinter making to achieve desired properties of the sinter as per the customer requirement .…”

Section: Figure 4 Process Chart For Integrated Slag Management Systemmentioning

confidence: 98%

Optimization Studies of Hot Metal Desulphurized and Basic Oxygen Furnace Slags in Sinter Making at JSW Steel Limited

Kalshetty¹,

MV²,

Bonda³

et al. 2017

IJERT

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-A large amount of various slags are being generated from steel melting process in integrated steel plants. Disposal of large quantities of slag becomes a big environmental concern. Slags generation from Steel Melting shop such as LD and HMDS Slag these slag has free CaO, which can replace some amount of flux in Iron Making burden. But due to high Phosphorous content in LD slag and high Sulphur in HMDS, these slags are not directly used in sinter making. In agglomeration these slags usage could be the ideal approach to maximize its use in sinter feed and thereby increase in the productivity and quality of the sinter plant which will reduce the cost of production due to available free Cao and Fe %. The process of micro-pelletisation followed by sintering may be considered for their utilization in the steel plants.

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Section: Figure 4 Process Chart For Integrated Slag Management Systemmentioning

confidence: 98%

Optimization Studies of Hot Metal Desulphurized and Basic Oxygen Furnace Slags in Sinter Making at JSW Steel Limited

Kalshetty¹,

MV²,

Bonda³

et al. 2017

IJERT

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“…El índice RDI tiene el valor más bajo (es el mejor) para la mezcla mineral 3 (Tabla XI) y, esto, se puede asociar con el menor contenido en Al 2 O 3 de todas las mezclas (1,02 % Al 2 O 3 ) [28][29][30][31] y a la presencia de un contenido en MgO más elevado en la mezcla, que resulta beneficioso para el RDI [32] .…”

Section: íNdice Rdiunclassified

Racionalización de mezclas de minerales de hierro para la obtención de sinterizados de calidad optima

Cores¹,

Ferreira²,

Muñiz³

2009

Rev. metal.

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ResumenSe utilizaron diversos minerales de hierro, fundentes y coque para preparar cuatro mezclas minerales con distintas proporciones de estos minerales. Con cada mezcla se fabricó una serie de sinterizados en planta piloto. Se caracteriza cada uno de los sinterizados mediante análisis químico y granulométrico, ensayo de la degradación del sinterizado durante la reducción en el horno alto (ensayo RDI), ensayo de la resistencia en frío (ensayo Tumbler), ensayo de reductibilidad; determinación de las temperaturas de reblandecimiento y fusión y determinación de la estructura del sinterizado por microscopia electrónica. Se establecen las condiciones de las mezclas y los parámetros de operación para la obtención de sinterizados de calidad óptima. Palabras claveSinterización; Mezclas minerales; Minerales de hierro; Horno alto. Rationalisation of iron ore mixtures for obtaining optimum quality sinters AbstractVarious iron ores, fluxes and coke, were used to prepare four ore mixtures with different proportions of these minerals. With each mixtures a series of sinters were produced in the pilot plant. Each one of the sinters was characterised by: chemical and granulometric analysis; degradation test on the sinter during reduction in the blast furnace, (RDI test); cold resistance test, (Tumbler Test); reducibility test; determining of softening and melting temperatures; and the determination of the structure of the sinter by electron microscopy. T he conditions of the mixtures and the operational parameters for obtaining the optimum quality of the sinters were established. KeywordsSintering; Ore mixtures; Iron ores; Blast furnace. INTRODUCCIÓNEl proceso de sinterización se utiliza para aglomerar una mezcla de minerales de hierro, fundentes y coque, de tamaño de partícula inferior a 8 mm, de tal forma que el sinterizado producido, con tamaño tamizado entre 12 y 35 mm, una vez cargado en el hormo alto, puede soportar las presiones y temperaturas del horno.En el proceso de sinterización, la mezcla de mineral se somete, previamente, a una granulación que consiste en homogenizar la mezcla en un tambor giratorio, con la adición de un 6-8 % de agua, durante unos minutos.Los gránulos formados se cargan sobre la parilla de la banda de sinterización, en donde la temperatura de los gránulos se eleva entre 1.250 y 1.350 °C para producir la fusión parcial y producir material semifundido, el cual, durante el enfriamiento posterior, cristaliza en varias fases minerales de distinta composición química y morfológica, principalmente, hematita, magnetita, ferritos y ganga formada en sus mayor parte por silicatos cálcicos [1][2][3] . La energía del proceso la suministra la combustión del coque. Los factores que afectan a la sinterización y a la calidad del sinterizado producido son, entre otros: a) el tamaño y composición de los gránulos; b) el tamaño, composición y propiedades relativas de los componentes de la alimentación (minerales de hierro, fundentes y coque); c) la composición mineralógica

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“…Calcium ferrite is the major mineral constituent of the sinter structure and it imparts strength to the sintered mass. High content of calcium ferrites favors the tumbler strength of the sinter [15,16].influence of HMDS Slag addition on sinter mean particle size and cum +10 mm percentage. In the present study sinter mean particle size was not influenced by the HMDS Slag addition.…”

Section: Experimental:-mentioning

confidence: 99%

Utilisation of Hot Metal Desulphurised Slag in Sinter Making at JSW Steel Limited.

Kalshetty¹,

MV²,

Bonda³

2017

IJAR

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In BOF, hot metal is converted into steel. Sulphur can be reduced in blast furnace / Corex, but it will be having detrimental effect on plant economy. The generation of steel melting slag are 200-220 kg/t of steel produced. Disposal of large quantities of slag becomes a big environmental concern. Slag from steel making has free CaO, which can replace some amount of flux in Iron Making burden. But due to high Phosphorous content in LD slag, it is proposed to use the pre treatment slag which has same CaO content and less Phosphorous. HMDS slag consists of 2-2.5 % sulphur and same slag used in lab scale to see the impact on sinter quality. Analysis of sinter shown decrease in sulphur up to 0.010%. Hence its is desired to use HMDS slag as substituent to LD Slag in iron ore sinter making which is being used since inception and usage is restricted due to phosphorous content . Thus, recycling of HMDS slag through the sintering process recovers lime, iron and magnesia and thereby saving of flux material and iron ore in future. Detailed investigation was carried out through lab scale studies for estimating the maximum permissible limits of usage of HMDS slag in sinter making and to know the influence of addition on sinter productivity and properties. Statistical Design of Experiments was conducted using the HMDS slag in sinter making from 0 to 60 kg/t of sinter. From the test results it was found that 30 to 35 kg HMDS slag can be used per ton of sinter to get desired properties of the sinter. Results are 30 % of HMDS with -5mm (5.9 %), 48.14 % (+10mm) Tumbler Index (67.12) with < 0.004 % of phosphorous.

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Fundamental Study of Size Degradation Mechanism of Agglomerates during Reduction

Cited by 25 publications

References 0 publications

Optimization Studies of Hot Metal Desulphurized and Basic Oxygen Furnace Slags in Sinter Making at JSW Steel Limited

Optimization Studies of Hot Metal Desulphurized and Basic Oxygen Furnace Slags in Sinter Making at JSW Steel Limited

Racionalización de mezclas de minerales de hierro para la obtención de sinterizados de calidad optima

Utilisation of Hot Metal Desulphurised Slag in Sinter Making at JSW Steel Limited.

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