Mechanism of high volatile matter in coal promoting non-isothermal reduction of Fe<sub>3</sub>O<sub>4</sub>

doi:10.13228/j.boyuan.issn1001-0963.20240231

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Journal of Iron and Steel Research ›› 2025, Vol. 37 ›› Issue (3) : 307-316. DOI: 10.13228/j.boyuan.issn1001-0963.20240231

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Mechanism of high volatile matter in coal promoting non-isothermal reduction of Fe₃O₄

YANG Yongkun, WANG Guanjie, ZHOU Xin, SHEN Wenting, WANG Weian, WANG Guohua, LI Xiaoming

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Abstract

With the development of electric arc furnace, the demand for direct reduced iron will also increase. The use of low temperature reduction to optimize magnetite is an important source of direct reduced iron. In order to study the mechanism of Fe₃O₄ reduction promoted by high volatile matter in coal, the pyrolysis gas composition and pyrolysis characteristics of Guanghui coal were analyzed. The pyrolysis of Guanghui coal and Fe₃O₄ reduction were studied by non-isothermal kinetics analysis method. The activation energy of the reaction was calculated by FWO, KAS and Starink methods. The Satava-Sestak method was used to fit the reaction model. The difference of kinetic mechanism of Fe₃O₄ reduction between activated carbon and coal was emphasized. The results show that the retorting gas of Guanghui coal is mainly composed of H₂, CH₄, CO and CO₂. In the reduction temperature range, the H₂ content and CO content of coal pyrolysis can reach 55 and 25 vol.%,respectively,which provides a good atmosphere for the reduction of Fe₃O₄. The temperature range of activated carbon reduction of Fe₃O₄ is 980-1 140 ℃, and the initial activation energy is 319.66 kJ/mol, while the reduction temperature range of Guanghui coal is 680-1 030 ℃, and the initial activation energy is 288.62 kJ/mol. The results show that the high volatile matter in Guanghui coal plays a catalytic role in the reduction process and significantly reduces the reduction temperature and activation energy.

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coal base / volatile matter / reduction kinetics / activation energy / reduction model

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YANG Yongkun, WANG Guanjie, ZHOU Xin, SHEN Wenting, WANG Weian, WANG Guohua, LI Xiaoming. Mechanism of high volatile matter in coal promoting non-isothermal reduction of Fe₃O₄[J]. Journal of Iron and Steel Research, 2025, 37(3): 307-316 https://doi.org/10.13228/j.boyuan.issn1001-0963.20240231

References

[1] 姜周华,姚聪林,朱红春,等.电弧炉炼钢技术的发展趋势[J].钢铁,2020,55(7):1.
(JIANG Z H,YAO C L,ZHU H C,et al.Technology development trend in electric arc furnace steelmaking[J].Iron and Steel,2020,55(7):1.)
[2] 朱德庆,宋刘刚,杨聪聪,等.磁铁精矿性质对铁矿粉烧结特性的影响机理分析[J].钢铁,2024,59(10):1.
(ZHU D Q,SONG L G,YANG C C,et al.Mechanism analysis of the effect of magnetite concentrate properties on the sintering characteristics of iron ore fines[J].Iron and Steel,2024,59(10):1.)
[3] 周明顺,王义栋,赵东明,等.高配比磁铁精矿烧结技术的研究进展[J].钢铁,2020,55(5):1.
(ZHOU M S,WANG Y D,ZHAO D M,et al.Development on sintering technologies with high proportion of magnetite concentrates[J].Iron and Steel,2020,55(5):1.)
[4] 刘承鑫,余俊杰,张泽强,等.润磨对人工磁铁精矿球团性能的影响[J].钢铁,2018,53(1):17.
(LIU C X,YU J J,ZHANG Z Q,et al.Influence of damp milling on properties of artificial magnetite pellets[J].Iron and Steel,2018,53(1):17.)
[5] 王涵,李世安,杨发财,等.氢气制取技术应用现状及发展趋势分析[J].现代化工,2021,41(2):23.
(WANG H,LI S A,YANG F C,et al.Application status and development trend analysis of hydrogen production technologies[J].Modern Chemical Industry,2021,41(2):23.)
[6] 崔银萍,秦玲丽,杜娟,等.煤热解产物的组成及其影响因素分析[J].煤化工,2007,35(2):10.
(CUI Y P,QIN L L,DU J,et al.Products distribution and its influencing factors for coal pyrolysis[J].Coal Chemical Industry,2007,35(2):10.)
[7] 李洋.铁氧化物氢基熔融还原物相演变及还原动力学研究[D].北京:北京科技大学,2022.
(LI Y.Study on phase evolution and reduction kinetics of molten iron oxides reduced by hydrogen[D].Beijing:University of Science and Technology Beijing,2022.)
[8] 彭学诚,苏耀,郭汉杰,等.煤中挥发分对热解过程的行为影响分析[J].中国冶金,2022,32(11):41.
(PENG X C,SU Y,GUO H J,et al.Infulence analysis of volatile matter in coal on behavior of pyrolysis process[J].China Metallurgy,2022,32(11):41.)
[9] 易凌云.铁矿球团CO-H₂混合气体气基直接还原基础研究[D].长沙:中南大学,2013.
(YI L Y.Fundamental research on gas-based direct reduction of iron ore pellets with carbon monoxide and hydrogen mixtures[D].Changsha:Central South University,2013.)
[10] 潘建,段真,朱德庆,等.不锈钢尘泥球团煤基直接还原动力学[J].钢铁研究学报,2022,34(10):1067.
(PAN J,DUAN Z,ZHU D Q,et al.Kinetics of coal-based direct reduction of stainless steel dust pellets[J].Journal of Iron and Steel Research,2022,34(10):1067.)
[11] YIN H,LU J,LIU G J,et al.Application of chemometrics for coal pyrolysis products by online py-GCxGC-MS[J].ACS Omega,2021,6(5):3763.
[12] 尹瑞丽,陈利平,陈网桦,等.两种量热模式下物质热分解的动力学补偿效应[J].物理化学学报,2016,32(2):391.
(YI R L,CHEN L P,CHEN W H,et al.Kinetic compensation effect under two different calorimetric modes for thermal decomposition[J].Acta Physico-Chimica Sinica,2016,32(2):391.)
[13] FLYNN J H,WALL L A.A quick,direct method for the determination of activation energy from thermogravimetric data[J].Journal of Polymer Science Part B:Polymer Letters,1966,4(5):323.
[14] OZAWA T.Kinetic analysis of derivative curves in thermal analysis[J].Journal of Thermal Analysis,1970,2(3):301.
[15] FLYNN J H.Thermal analysis kinetics-past,present and future[J].Thermochimica Acta,1992,203:519.
[16] BURLEY G,KISSINGER H E.Systems silver iodide-sodium iodide and silver iodide-potassium iodide[J].Journal of Research of the National Bureau of Standards Section A:Physics and Chemistry,1960,64A(5):403.
[17] STARINK M.A new method for the derivation of activation energies from experiments performed at constant heating rate[J].Thermochimica Acta,1996,288(1):97.
[18] ŠKVÁRA F,ŠESTÁK J.Computer calculation of the mechanism and associated kinetic data using a non-isothermal integral method[J].Journal of Thermal Analysis,1975,8(3):477.
[19] WU Y N,TAO S,WANG Z H,et al.Effect of pyrolysis atmospheres on gaseous products evolution of coal pyrolysis at high temperature[J].Fuel,2024,366:131336.
[20] BILGE S,DONAR Y O,SINAG I.Effect of metal oxide nanoparticles on the evolution of valuable gaseous products during pyrolysis of Turkish low-rank coal[J].Journal of Analytical and Applied Pyrolysis,2018,136:242.
[21] FANG X J,WU C F,SONG Y,et al.The impact of pyrolysis temperature on the evolution of the maceral and mineral geochemistry in a subbituminous coal[J].Energy,2024,290:130092.
[22] 刘世君,郑安庆,付娟,等.热裂解气相色谱质谱在能源研究中的应用[J].分析试验室,2024,43(5):1.
(LIU S J,ZHENG A Q,FU J,et al.Application of pyrolysis gas chromatography-mass spectrometry in energy[J].Chinese Journal of Analysis Laboratory,2024,43(5):1.)
[23] 赵丽红,郭慧卿,马青兰.煤热解过程中气态产物分布的研究[J].煤炭转化,2007,30(1):5.
(ZHAO L H,GUO H Q,MA Q L.Study on gaseous products distributions during coal pyrolysis[J].Journal of the Energy Institute,2007,30(1):5.)
[24] 王鹏,文芳,步学朋,等.煤热解特性研究[J].煤炭转化,2005,28(1):8.
(WANG P,WEN F,BU X P,et al.Study on the pyrolysis characteristics of coal[J].Journal of the Energy Institute,2005,28(1):8.)
[25] YU G,BAI X,FAN X,et al.In-situ evaluation of volatile products released during pyrolysis of coals with different ranks[J].Journal of the Energy Institute,2024,115:101660.
[26] GENG C C,LI S Y,YUE C T,et al.Pyrolysis characteristics of bituminous coal[J].Journal of the Energy Institute,2016,89(4):725.
[27] ZOU C,MA C,ZHAO J X,et al.Characterization and non-isothermal kinetics of Shenmu bituminous coal devolatilization by TG-MS[J].Journal of Analytical and Applied Pyrolysis,2017,127:309.
[28] 朱廷钰,肖云汉,王洋.煤热解过程气体停留时间的影响[J].燃烧科学与技术,2001,7(3):307.
(ZHU T Y,XIAO Y H,WANG Y.Effect of gas residence time on coal pyrolysis[J].Journal of Combustion Science and Technology,2001,7(3):307.)
[29] SUN Y S,HAN Y X,GAO P,et al.Investigation of kinetics of coal based reduction of oolitic iron ore[J].Ironmaking & Steelmaking,2014,41(10):763.
[30] MI Q Y,LI B,LI Y F,et al.Kinetic analysis of pyrolysis reaction of hydrogen-containing low rank coals based on thermogravimetric method[J].Processes,2023,11(3):2227.
[31] HAMMAM A,CAO Y,EL-GEASSY A A,et al.Non-isothermal reduction kinetics of iron ore fines with carbon-bearing materials[J].Metals,2021,11(7):1137.