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Reaction behavior and non-isothermal kinetics of suspension magnetization roasting of limonite and siderite

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International Journal of Minerals,Metallurgy and Materials 2023年第5期30卷 824-833页

作者： Qiang Zhang Yongsheng Sun Yuexin Han Yanjun Li Peng Gao School of Resources and Civil Engineering Northeastern UniversityShenyang 110819China National-local Joint Engineering Research Center of High-efficient exploitation technology for Refractory Iron Ore Resources Shenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

In order to develop limonite and decrease CO_(2) emissions,siderite is proposed as a clean reductant for suspension magnetization roasting(SMR) of *** iron concentrate(iron grade:65.92wt%,iron recovery:98.54wt%) was obtained by magnetic separation under the optimum SMR conditions:siderite dosage 40wt%,roasting temperature 700℃,roasting time 10 *** to the magnetic analysis,SMR achieved the conversion of weak magnetic minerals to strong magnetic minerals,thus enabling the recovery of iron via magnetic *** on the phase transformation analysis,during the SMR process,limonite was first dehydrated and converted to hematite,and then siderite decomposed to generate magnetite and CO,where CO reduced the freshly formed hematite to *** microstructure evolution analysis indicated that the magnetite particles were loose and porous with a destroyed structure,making them easier to be *** non-isothermal kinetic results show that the main reaction between limonite and siderite conformed to the two-dimension diffusion mechanism,suggesting that the diffusion of CO controlled the *** results encourage the application of siderite as a reductant in SMR.

关键词： reaction behavior non-isothermal kinetics suspension magnetization roasting siderite limonite CO_(2)emissions

Mechanism of microwave assisted suspension magnetization roasting of oolitic hematite ore

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Journal of Central South University 2022年第2期29卷 420-432页

作者： ZHOU Wen-tao SUN Yong-sheng HAN Yue-xin GAO Peng LI Yan-jun College of Chemical and Biological Engineering Shandong University of Science and TechnologyQingdao 266590China School of Resources and Civil Engineering Northeastern UniversityShenyang 110819China National-local Joint Engineering Research Center of High-efficient Exploitation Technology for Refractory Iron Ore Resources Shenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

Oolitic hematite is an iron ore resource with rich reserves,complex composition,low grade,fine disseminated particle sizes,and a unique oolitic *** this study,a microwave-assisted suspension magnetization roasting technology was proposed to recover and utilize the *** results showed that under the conditions of microwave pretreatment temperature of 1050℃ for 2 min,a magnetic concentrate with an iron grade of 58.72%at a recovery of 89.32%was obtained by microwave suspension magnetization roasting and magnetic ***,compared with the no microwave pretreatment case,the iron grade and recovery increased by 3.17%and 1.58%,*** pretreatment increased the saturation magnetization of the roasted products from 24.974 to 39.236(A∙m^(2))/kg and the saturation susceptibility from 0.179×10^(−3) m^(3)/kg to 0.283×10^(−3) m^(3)/*** were formed between the iron and gangue minerals,and they gradually extended to the core of oolite with the increase in the pretreatment *** reducing gas diffused from outside to inside along the microcracks,which promoted the selective transformation of the weak magnetic hematite into the strong magnetic magnetite.

关键词： oolitic hematite microwave suspension magnetization roasting phase and magnetic transformation microstructure evolution

Application of suspension magnetization roasting as technology for high-efficiency separation of valuable iron minerals from high-iron bauxite

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Transactions of Nonferrous Metals Society of China 2022年第7期32卷 2391-2402页

作者： Ruo-feng WANG Shuai YUAN Peng GAO Yan-jun LI School of Resources and Civil Engineering Northeastern UniversityShenyang 110819China National-local Joint Engineering Research Center of High-efficient Exploitation Technology for Refractory Iron Ore Resources Shenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

A technology for suspension magnetization roasting−magnetic separation was proposed to separate iron minerals for *** optimum parameters were as follows:a roasting temperature of 650℃,a roasting time of 20 min,a CO concentration of 20%,and particles with a size less than 37μm accounting for 67.14%of the roasted *** total iron content and iron recovery of the magnetic concentrate were 56.71%and 90.50%,*** phase transformation,magnetic transition,and microstructure evolution were systematically characterized through iron chemical phase analysis,X-ray diffraction,vibrating sample magnetometry,X-ray photoelectron spectroscopy,and transmission electron *** results demonstrated the transformation of hematite to magnetite,with the iron content in magnetite increasing from 0.41%in the raw ore to 91.47%in the roasted product.

关键词： high-iron bauxite suspension magnetization roasting comprehensive utilization magnetic separation phase transformation

Effect of temperature on suspension magnetization roasting of hematite using biomass waste as reductant:A perspective of gas evolution

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Journal of Central South University 2024年第6期31卷 1870-1887页

作者： CAO Yue SUN Yong-sheng HAN Yue-xin GAO Peng LI Yan-jun School of Resources and Civil Engineering Northeastern UniversityShenyang 110819China National-local Joint Engineering Research Center of High-efficient Exploitation Technology for Refractory Iron Ore Resources Shenyang 110819China

The magnetization reduction of hematite using biomass waste can effectively utilize waste and reduce CO_(2) emission to achieve the goals of carbon peaking and carbon *** effects of temperatures on suspension magnetization roasting of hematite using biomass waste for evolved gases have been investigated using TG-FTIR,Py-GC/MS and gas composition *** mixture reduction process is divided into four *** the temperature range of 200-450℃ for mixture,the release of CO_(2),acids,and ketones is dominated in gases *** yield and concentration of small molecules reducing gases increase when the temperature increases from 450 to 900℃.At 700℃,the volume concentrations of CO,H_(2) and CH_(4) peak at 8.91%,8.90% and 4.91%,*** the suspension magnetization roasting process,an optimal iron concentrate with an iron grade of 70.86%,a recovery of 98.66% and a magnetic conversion of 45.70% is obtained at 700℃.Therefore,the magnetization reduction could react greatly in the temperature range of 600 to 700℃ owing to the suitable reducing *** study shows a detail gaseous evolution of roasting temperature and provides a new insight for studying the reduction process of hematite using biomass waste.

关键词： suspension magnetization roasting biomass pyrolysis gases evolution reduction behavior

Siderite pyrolysis in suspension roasting:An in-situ study on kinetics,phase transformation,and product properties

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Journal of Central South University 2022年第6期29卷 1749-1760页

作者： ZHANG Qi SUN Yong-sheng QIN Yong-hong GAO Peng YUAN Shuai School of Resources and Civil Engineering Northeastern UniversityShenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China National-local Joint Engineering Research Center of High-efficient Exploitation Technology for Refractory Iron Ore Resources Shenyang 110819China

Siderite,as an abundant iron ore,has not been effectively utilized,with a low utilization *** this study,the in-situ kinetics and mechanism of siderite during suspension magnetization roasting(SMR)were investigated to improve the selective conversion of siderite to magnetite and CO,enriching the theoretical system of green SMR using siderite as a *** to the gas products analyses,the peak value of the reaction rate increased with increasing temperature,and its curves presented the feature of an early peak and long *** mechanism function of the siderite pyrolysis was the contraction sphere model(R_(3)):f(α)=3(1−α)2/3;E_(α)was 46.4653 kJ/mol;A was 0.5938 s^(−1);the kinetics equation was k=0.5938exp[−46.4653/(RT)].The in-situ HT-XRD results indicated that siderite was converted into magnetite and wüstite that exhibited a good crystallinity in SMR under a N_(2) *** 620℃,the saturation magnetization(M_(s)),remanence magnetization(Mr),and coercivity(Hc)of the product peaked at 53.63×10^(-3)A·m^(2)/g,10.23×10^(-3)A·m^(2)/g,and 12.40×10^(3)A/m,***,the initial particles with a smooth surface were transformed into particles with a porous and loose structure in the roasting process,which would contribute to reducing the grinding cost.

关键词： siderite suspension magnetization roasting reaction kinetics phase transformation magnetic transition microstructure evolution