effect of high alumina on iron on pellets properties

Effect of Blaine Fineness on the Quality of Hematite Iron ...

The paper presents the effect of Blaine number on green and dry strength, cold crushing strength, reducibility index, reduction degradation index, swelling index, apparent porosity, optical micro structure, etc. of the high alumina hematite ore pellets. The results showed improved properties of iron ore pellets at an optimum Blaine number (2150 ...

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Effect of Alumina on Reduction Softening and Melting ...

Effect of Alumina on Reduction Softening and Melting Behaviour of Iron Ore Pellets. Author. Chauhan, Devi Singh (TU Delft Mechanical, Maritime and Materials Engineering) Contributor. Yang, Yongxiang (mentor) Gavel, Dharm Jeet (graduation committee) Degree granting institution. Delft University of Technology. Programme. Materials Science and ...

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Development on Iron Ore Pelletization Using Calcined Lime ...

MgO in form of olivine reduces the RDI of high alumina hematite ore to a very low level and 0.6–1.0% requirement of it has been found to be optimum. 0.25 basicity in pellet with 1% MgO and 1% C shows lowest RDI and other properties of pellets viz. CCS, RI, swelling index and porosity are also very suitable at this level.

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PAPER OPEN ACCESS Related content Characterization of iron ...

especially when concentrate with high SiO 2 content. These have adverse effects on the process. De Souza, Kater and Steeghs (1984) reported that with the addition of 1 % bentonite, containing 85 % SiO 2 +Al 2 O 3 decreases the iron content (0.6-0.7 wt %) in the pellets [5]. The increase in silica content

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Iron Ore Pellets and Pelletization Process – IspatGuru

 · The type and amount of these phases, their chemistry and distribution plays a vital role in deciding the metallurgical properties of the product pellets during reduction in the subsequent iron making process. Studies of green pellets and induration of magnetite and high grade hematite iron ore fines with low alumina have been carried out in ...

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High-Temperature Properties of Alumina Refractory Brick ...

ties associated with alumina, including free iron, titania, and alkalies, can have a very detrimental effect on the high-temperature properties of alumina refractories owing to reactions that pro­ duce low-melting secondary crystalline phases or glasses, which soften at high temperatures, causing deformation and/or

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Influence of Alumina on Iron Ore Sinter Properties and ...

 · Due to depletion of high grade iron ore resources, alumina content in the iron ore fines is expected to increase gradually. Ore with higher alumina content is usually expected to be detrimental in forming the sinter matrix, if sintered alone, due to the low reactivity of alumina bearing minerals and the high viscosity of primary melts.

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Model studies on the effects of composition differences of ...

common to coat the DR-pellets with an oxide which has a high melting temperature, such as CaO or MgO[2,3]. Another important aspect of the DR of DR-pellets is that all the slag elements remain and follows the pellet on its transition from iron ore to metallic iron. This is due to the fact that the DR is a …

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The Effects of Iron, Silicon, Chromium, and Aluminum ...

 · The Effects of Iron, Silicon, Chromium, and Aluminum Additions on the Physical and Mechanical Properties of Recycled 3D Printing Filaments Guan‐Ting Pan Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei City, 106 Taiwan

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EFFECT OF MAGNETITE, HEMATITE AND PELLET …

relatively high additions of magnetite in the sinter blend. The addition of magnetite significantly increases the iron content of the sinter mix, allowing for better flexibility in the choice of raw materials. Addition of pellet screenings seems to have a beneficial effect regarding sintering …

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EFFECT OF SIZE DISTRIBUTION AND WATER CONTENT ON ...

The iron ore pellets formed exhibit the following superior properties: Uniform size of 9 – 15 mm High and uniform porosity of 25-30% Low abrasion and good transportability High iron content of more than 65% Uniform composition: Haematite is easily reducible Volatile …

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Effect of sintering temperature on optical properties and ...

Effect of sintering temperature on optical properties and microstructure of translucent zirconia prepared by high-pressure spark plasma sintering Haibin Zhang, Byung-Nam Kim, Koji Morita, Hidehiro Yoshida Keijiro Hiraga and Yoshio Sakka Advanced Materials Processing Unit, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba,

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Reduction properties of doped hematite pellets

The objective of the present work was to study the reduction properties of doped hematite pellets, with special reference to the properties demanded by direct reduction (DR) processes, viz: high reducibility coupled with low dimensional changes and high strength during reduction. Iron oxide ores doped with lime, silica and alumina were studied microstructurally using optical and scanning ...

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Effect of pellet basicity and MgO content on the quality ...

 · The effect of pellet basicity and MgO content on the melt formation and microstructure during the induration of iron ore pellets was examined. Fired pellets with varying basicity (0 to 0.8) and MgO (0 and 1.5%) content were tested for cold strength, reduction degradation index, reducibility, swelling and softening–melting characteristics.

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Reduction Behavior of Carbon Composite Pellets Including ...

pellet which significantly changed the reaction rate during reduction.16,17) Individual effect of alumina and silica on the reduction of carbon composite pellet was investigated at 1473 K (1200°C) in the previous study conducted by the authors.18) Interestingly, alumina increased the reaction rate by increasing surface area while silica ...

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Effect of Blaine Fineness on the Quality of Hematite Iron ...

 · Effect of Blaine Fineness on the Quality of Hematite Iron Ore Pellets for Blast Furnace ... optical micro structure, etc. of the high alumina hematite ore pellets. The results showed improved properties of iron ore pellets at an optimum Blaine number (2150 cm 2 /g) but, reduction degradation index was found to be very poor for the given ore ...

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Iron Ore Pelletizing Process: An Overview | IntechOpen

 · The iron ore production has significantly expanded in recent years, owing to increasing steel demands in developing countries. However, the content of iron in ore deposits has deteriorated and low-grade iron ore has been processed. The fines resulting from the concentration process must be agglomerated for use in iron and steelmaking. This chapter shows the status of the pelletizing process ...

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Influence of Pellet Basicity (CaO/SiO2) on Iron Ore Pellet ...

JSW Steel Limited is operating a 4.2 Mtpa pellet plant to produce pellets for two blast furnaces and two corex iron making units. During processing of pellets in an iron mak-ing units, their physical, metallurgical and microstructural properties have a major influence on their reduction behav-iour. In general, the main types of pellets for ...

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Effect of Bentonite on the Pelleting Properties of Iron ...

 · Pellets should have the properties of high grade, good intensity, and uniform granularity as beneficial furnace burden in the ironmaking process. To increase yield and reduce coke consumption and to improve economic benefits, acidic pellet can be combined with highly basic pellet to form appropriate burden structure [1].

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Effect of pyroxenite and olivine minerals as source of MgO ...

 · Pelletization of hematite ore requires high fineness and very high induration temperature (~1325 °C) owing to its poor diffusion bonding unlike magnetite ore. Further, high-alumina hematite pellets show very high reduction degradation index (RDI) during low temperature (500–650 °C) reduction due to their volume expansion and lattice distortion.

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Effectiveness of Organic Binders for Iron Ore Pelletization

the iron ore industry, methods need to be developed for producing domestic iron ore pellets that are economical and have superior metallurgical properties that will result in coke reduction during blast furnace smelting. Since iron ore concentrates consist of finely divided particles, they must be pelletized (with a binder) for use as

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Investigating the effect of alumina shaping on the ...

 · The alumina shaped pellets should retain their properties and porosity even after exposure to humidity for an extended time. To this end, the samples used in the vapour adsorption experiments from the previous section were left exposed to air …

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Adapting to Raw Materials Challenges: Part 1

High gangue content increases electrical power and refractory consumption in electric arc furnace (EAF) steel production. Lime, magnesia, silica, alumina, and titania affect the reducibility of the iron oxide and can impose a practical limit on the maximum degree of metallization that can be obtained.

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The disparity of pellet properties on using a mixture of ...

the pellet strength (Ahmed, 1996). 3.2. Effect of calcium hydroxide addition on the properties of dried pellets Figure 2 illustrates the relation between the dry pellet properties (pellets dried at 400oC for 10 min.) and amount of calcium hydroxide added with 0.4% bentonite. 7500 7000 6500 5500 5000 4500 4000 Calcium h Figure 2. Effect of ...

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Characterisation of the Physical and Metallurgical ...

Only high-grade iron ores with high levels of physical and metallurgical characteristics can be efficiently used directly in the BF process. Table 3 shows some of the characteristic requirements on natural iron ore lump, pellets and sinters, to serve as a feed material to the main iron production processes.

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Effect of Fluxing Agents on the Quality and Microstructure ...

 · Abstract. Indian iron ore fines with high alumina content (~2.5% Al 2 O 3) resulted in poor quality pellets and a study was under taken to establish suitable pellet chemistry through proper fluxing agents.Limestone fluxed pellets were prepared at varying basicity (0 to 0.8) and pyroxenite fluxed pellets at varying MgO contents (0 to 3%) to study their effect on the metallurgical properties.

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(PDF) Coating of iron oxide pellets for direct reduction ...

In this C Blackwell Munksgaard, 2002 study, the effect of coating on the sticking of DR-grade pellets with low and high basicity (Midrex and HyL quality pellets, Accepted for publication 7 November 2001 In the past few decades, direct reduction of iron ores The first five properties are also desirable for blast has become an important step in ...

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Improved Reduction Kinetics of Low Grade Iron Ore Pellet ...

Effect of Higher silica and alumina on pellet Reducbility Sample PP2 pellet Degree of reduction, % 95.45 Reducibility(dR/dT), %O2/min 0.54 Degree of metallization, % 92.8 FeO in DRI 8.23 H S P Surface H S P Inner Mantle H S P Core 1. Due to high silica and alumina in the ore, the slag volume is high. 2. The slag boundary is larger between the ...

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The effect of binders on structure and chemical properties ...

 · Pellets of 3 mm in length were ... Effect of binder on the chemical propertiesThis study used Fe-K/γ-Al 2 O 3 without binder ... (OH) 3 ·xH 2 O first reacts with alumina binder and then iron aluminate is formed. In other words, iron ions diffuse into the gel structure until there is an iron aluminate structure formed around each of the catalyst.

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Effect of cooling rate and alumina dissolution on the ...

 · A high density alumina crucible and rotor have been used for the viscosity measurements,, . Other materials used include iron and molybdenum, . Alumina has advantages of being chemically inert, physically durable during heating and cooling, readily available, and reasonably priced. However, alumina dissolves into molten slag.

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