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Migration behaviors and kinetics of phosphorus during coal-based reduction of high-phosphorus oolitic iron ore

International Journal of Minerals,Metallurgy and Materials 2019年第8期26卷 938-945页

作者： Yong-sheng Sun Yan-feng Li Yue-xin Han Yan-jun Li School of Resources and Civil Engineering Northeastern University

To understand the migration mechanisms of phosphorus(P)during coal-based reduction,a high-phosphorus oolitic iron ore was reduced by coal under various experimental *** migration characteristics and kinetics of P were investigated by a field-emission electron probe microanalyzer(FE-EPMA)and using the basic principle of solid phase mass transfer,*** results showed that the P transferred from the slag to the metallic phase during reduction,and the migration process could be divided into three stages:phosphorus diffusing from the slag to the metallic interface,the formation of Fe P compounds at the slag metal interface and P diffusing from the slag metal interface to the metallic *** reduction time and temperature significantly influenced the phosphorus content of the metallic and slag *** P content of the metallic phase increased with increasing reduction time and temperature,while that of the slag phase gradually *** P diffusion constant and activation energy were determined and a migration kinetics model of P in coal-based reduction was proposed.P diffusion in the metallic phase was the controlling step of the P migration.

关键词： high-phosphorus oolitic iron ore coal-based reduction phosphorus migration kinetics

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Strengthening iron enrichment and dephosphorization of high-phosphorus oolitic hematite using high-temperature pretreatment

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International Journal of Minerals,Metallurgy and Materials 2020年第4期27卷 443-453页

作者： Wen-tao Zhou Yue-xin Han Yong-sheng Sun Yan-jun Li College of Resources and Civil Engineering Northeastern UniversityShenyang 110819China

The efficient development and utilization of high-phosphorus oolitic hematite is of great strategic significance for the sustainable supply of iron-ore resources in *** this paper,the mechanism of high-temperature pretreatment for enhancing the effect of iron enrichment and dephosphorization in the magnetization roasting–leaching process was studied by X-ray diffraction(XRD),vibration sample magnetometer(VSM),scanning electron microscopy and energy dispersive spectrometry(SEM–EDS).Compared with the process without high-temperature pretreatment,the iron grade of the magnetic separation concentrate after high-temperature pretreatment had increased by 0.98%,iron recovery rate had increased by 1.33%,and the phosphorus content in the leached residue had decreased by 0.12%.High-temperature pretreatment resulted in the dehydration and decomposition of hydroxyapatite,the dehydration of limonite and the thermal decomposition of siderite,which can produce pores and cracks and weaken the compactness of the ore,improve the magnetization characteristics of roasted ore,and strengthen the iron enrichment and dephosphorization during the magnetization roasting and leaching process.

关键词： high-phosphorus oolitic hematite high-temperature pretreatment iron enrichment and dephosphorization magnetization roasting–leaching process phase transformation

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Geology, Mineralogy and Geochemistry of the Oligocene oolitic Iron Ore of the Continental Terminal Formation, Kandi Basin, North-East Benin

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International Journal of Geosciences 2019年第4期10卷 491-512页

作者： Adiss Kamal Issifou Fatiou Moussa Konaté Soulémana Yessoufou Cossi Luc Adissin Glodji Matthias Heckmann Hamidou Garba Saley Department of Geology Groundwater and Georesources Laboratory Faculty of Sciences and Technology Abdou Moumouni University of Niamey Niamey Niger Department of Earth Sciences Laboratory of Geology Mines and Environment Faculty of Sciences and Technology University of Abomey-Calavi Abomey-Calavi Benin Federal Institute for Geosciences and Natural Resources (BGR) Hannover Germany

The Oligocene Continental Terminal Formation of the Kandi Basin contains high grades of iron mineralization (~56.72% Total Fe). The microscopic study under the polarized and reflected light showed that the iron ore consists of silicate minerals (quartz 50% and zircon 1%) and non-silicate minerals (goethite 30%, hematite 7%, magnetite 3%, pyrite 1%, chalcopyrite 1%, blende 3%, galena 3%, scheelite 1% and gold 2%). The X-rays fluorescence shows that the iron ore is characterized by various elements, such as Fe2O3 (57.91% to 91.33%), SiO2 (3.07% to 33.19%), aluminum (2.94% to 7.74%), vanadium (0.04% to 0.11%), phosphorus (0.79% to 2.29%) and sulfur (oolitic iron ores in exploitation from other countries such as Brazil, Australia, China, Russia, Uganda and the United States shows that iron ore of the Kandi Basin can be mined despite its high silica content.

关键词： Kandi Basin oolitic Iron Ore Continental Terminal Formation

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Microwave Assisted Liberation of High Phosphorus oolitic Iron Ore

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Journal of Minerals and Materials Characterization and Engineering 2014年第5期2卷 414-427页

作者： Mamdouh Omran Timo Fabritius Nagui Abdel-Khalek Mortada El-Aref Abd El-Hamid Elmanawi Mahmoud Nasr Ahmed Elmahdy Laboratory of Process Metallurgy Research Group Process and Environmental Engineering Department University of Oulu Oulu Finland Central Metallurgical Research and Development Institute Cairo Egypt Geology Department Faculty of Science Cairo University Cairo Egypt

The influence of microwave treatment on the liberation of iron ore from the high phosphorus oolitic iron ore from Aswan region, Egypt was studied. The effect of microwave power, exposure time and grain size on the liberation of iron ore was investigated. The microfractures and cracks of the samples were characterized before and after microwave treatments. The heating rate of high phosphorus oolitic iron ore was studied. Crystallinity of hematite was characterized before and after microwave pretreatment. The results indicated that intergranular fractures formed between the gangues (fluorapatite and chamosite) and hematite after microwave treatment, leading to improved liberation of iron ore and a significant reduction in comminution energy. Percentages of fraction ≤ -0.125 mm increased from 46.6% to 59.76% with increased exposure time from 0 to 60 seconds. The heating rate of iron ore showed that microwave treatment was less efficient at smaller particle sizes for a fixed applied power density. Crystallinity of hematite increased with the microwave exposure time.

关键词： Microwave Treatment High Phosphorus oolitic Iron Ore Liberation

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Kinetics and Dissolution Mechanisms of oolitic Limestone Under Burial Condition

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地学前缘 2009年第S1期16卷 137-137页

作者： Kangjun Huang,Zhengyu Bao,Tianfu Zhang 1.Graduate School,China University of Geosciences(Wuhan),Wuhan 430074,China. 2.State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,China

In order to study the control factors and mechanism of oolitic limestone reservoir being corroded by organic acid produced in burial stage,the reactions of acetic acid(pH=3) with oolitic limestone were investigated using the rotating-disk Corrosion Reactor System(CRS).The effects of disk rotational speed, temperature and system pressure were examined. Scanning Electron Microscope attached with Energy Dispersive X-Ray Analyzer(SEM-EDX) was

关键词： oolitic limestone reservoir acetic acid dissolution kinetics mechanisms the rotateng-disk corrosion reactor system

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