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SFCA formation in magnetite sintering occurs primarily in the cooling stage as magnetite oxidation is rather limited prior to the arrival of high temperature zone tive humidity of the air from the system exit reached 40% at 40°C Sinter mix consisting of the blended ore seen in Fig 2
·The presence of Ca ferrite and silico ferrite of calcium and aluminium SFCA bonding phases is thought to be crucial to maintain sinter quality due to their high reducibility and strength levels However new evidence suggests that porosity might be an equally important factor controlling reducibility in addition to mineralogy This work aims to fundamentally
·Ren Wei of Chongqing University studied the microwave external field sintering of magnetite mainly from the quality protective atmosphere N 2 and Fe 3 O 4 added amount to the magnet concentrate microwave burning [7 8] At present in the field of sintering for the problems of high energy consumption and high pollution some scholars have
·Finally the developed automatization and control systems for the iron and steelmaking industry to improve the labor productivity getting sinter with high yield and optimal quality mechanical and chemical as well as saving energy are described A short description of the sintering process is also presented in Fernández González et al
·In vanadium titanium magnetite sintering the mineral phase evolution of calcium ferrite system is greatly affected by the content of TiO Manshadi et al [14] found that Ti was mainly distributed in perovskite and silico ferrite of calcium and aluminum SFCA phases and a small amount of Ti was dissolved in hematite H and magnetite M
·The quality of magnetite pellet is primarily determined by the physico chemical changes the pellet undergoes as it makes excursion through the gaseous and thermal environment in the induration furnace Among these physico chemical processes the oxidation of magnetite phase and the sintering of oxidized magnetite hematite and magnetite non
·The values of activation energy and time exponent derived suggests that sintering of oxidized magnetite hematite is dominated by a single diffusion mechanism whereas sintering of magnetite
·The replacement of magnetite by hematite is commonly observed in various geologic systems In contrast to the formation of hematite by a solid state oxidation numerous experimental results have demonstrated that it can also occur by a redox independent dissolution reprecipitation reaction provides a natural case to better understand the
·To achieve high efficiency utilization of complex and unmanageable iron containing minerals the effects of oxygen enrichment on productivity yield flame front speed exhaust gas peak temperature and desulphurization reaction of the vanadium titanium magnetite sintering process as well as sinter tumble index and mineralogy were clarified with oxygen
·High quality oxidized pellets are the basis to achieve high efficiency utilization of vanadium titanium magnetite VTM ores Bentonite was used as a binder of VTM The main phase composition of VTM is titanomagnetite and ilmenite When the amount of bentonite is 1% the compressive strength and dropping strength of VTM pellets can meet the requirements To
DOI /S1003 6326 15 63819 5 Corpus ID 137497815; Effect of basicity on sintering behavior of low titanium vanadium titanium magnetite article{Yang2015EffectOB title={Effect of basicity on sintering behavior of low titanium vanadium titanium magnetite} author={Songtao Yang and Mi Zhou and Tao Jiang and Yan jun Wang and Xiangxin Xue}
Studies havebeencarried out for sintering of magnetite ore It wasfound that magnetite wasless reactive than hematite and piso]ite and therefore required high sintering temperature to ensure adequate sinter strength This maybe the main reason whya high coke rate is often associated with magnetite ore blend sintering Underan oxidising
·Sintering basic characteristics of fourteen iron ores were comprehensively evaluated using micro sinter and grey relational analysis methods The results show that magnetite has a low assimilability high bonding phase strength and high crystal strength Hematite presents a good assimilability while limonite exhibits a strong assimilability but the
·The replacement of magnetite by hematite is commonly observed in various geologic systems especially in banded iron formations BIF iron oxide copper gold deposits and iron skarn deposits Angerer et al 2012; Franchini et al 2000; Ehrig et al 2021 The transformation of magnetite to hematite was attributed to an oxidizing reaction generally
·The transformation between iron oxide minerals is one of the most common phenomena in a geologic system It can be chemically described as a reversible reaction and can be also reproduced in laboratory experiments with controlled atmospheres Turkdogan and Vinters 1971 Swaddle and Oltmann 1980 Piotrowski et al 2005 Otake et al 2007 Magnetite
·The effect of morphology on the sintering behavior of particles has been investigated in the literature [25] [26] Formoso et al [27] investigated oxidation and sintering mechanisms in magnetite ore green pellets according to the fineness of raw material They showed that at a constant porosity in green pellets the oxidation time becomes
·Artificial rich ore for blast furnace use can be produced by sintering ultra poor vanadium titanium magnetite PVTM with a high grade iron concentrate Here acid R = self fluxing R = and high basicity R = PVTM sinters were produced in a sinter pot Their performances were determined using the comprehensive index The microstructures
2 ·The obtained particles were pressed into a magnetite cylinder 10 mm in diameter and mm in height sealed into a silver tube and sintered at 500 °C and GPa for 2 h Laser Raman spectroscopy results indicated that high temperature and high pressure sintering did not induce any phase transformation
·Perovskite easily forms during sintering of vanadium titanium magnetite VTM and is unfavorable for the following blast furnace Steelmaking can concomitantly produce a great quantity of oxidized scale composed mainly of FeO and Fe 3 O ferrite CaO·Fe 2 O 3 CF can be formed by oxidized scale with lime in air atmosphere and then added to the VTM
·At 1573 K the liquid phase promotes the recrystallization growth of hematite at high temperature Molecular dynamic study shows that it is difficult for quartz SiO2 to form sintering neck with Fe2O3 When the calcination temperature is higher than 1400 K the Fe2O3 Fe2SiO4 system produces a considerable sintering neck structure after relaxation
·The large phase field for Magnetite Liquid under typical sintering compositions and temperatures was found to prevent all but minor formation of Ca ferrites via hematite from low basicity <
·Sintering systems are suitable for sintering in large ferrous metallurgy plants and are the main equipment used in the process of convulsions sintering Sintering systems are used for sintering blocks of V containing iron concentrate and mineral rich powders with various compositions and granularities Sintering partially removes sulfur
each phase after sintering of magnetite samples are likely to hematite samples From the image process ing results the ratio of each phases formed after sintering of samples were at the same level So it is expected that magnetite can be used as raw material instead of hematite in sintering process Under Air
2 system for these conditions are illus trated schematically in Fig 1 It is assumed in this repre sentation that Al 2O 3 behaves in an equivalent manner to Fe 2O 3 It can be seen that on cooling pure iron oxide liquid the magnetite phase Fe 3O 4 is the first solid phase to form At sub liquidus temperatures the magnetite phase becomes
·Similarly sintering models at pellet scale were formulated by incorporating the deduced kinetic parameters for probable presence of both the phases—oxidized magnetite and non oxidized magnetite
