Effects of biomass reducing agent on magnetic properties and phase transformation of Baotou low-grade limonite during magnetizing-roasting

Autor: Zhi Jun Gong, Kai Zhang, Wen Chao Guo, Wen Fei Wu, Bao Wei Li, Xiu Li Chen, Hui Juan Luo
Jazyk: angličtina
Rok vydání: 2017
Předmět:
Fossil Fuels
Hot Temperature
Magnetic Properties
lcsh:Medicine
02 engineering and technology
Ferric Compounds
020501 mining & metallurgy
law.invention
Geographical Locations
X-Ray Diffraction
law
Phase (matter)
Electron Microscopy
Biomass
lcsh:Science
Limonite
Roasting
Microscopy
Multidisciplinary
Physics
Magnetism
021001 nanoscience & nanotechnology
Microstructure
Condensed Matter Physics
Chemistry
Coal
0205 materials engineering
Reducing Agents
visual_art
Physical Sciences
visual_art.visual_art_medium
Engineering and Technology
Scanning Electron Microscopy
Organic Materials
0210 nano-technology
Research Article
Chemical Elements
China
Materials science
Asia
Reducing agent
Iron
Materials Science
Material Properties
Mineralogy
Fuels
Research and Analysis Methods
Magnetic Materials
Ferrous
Magnetization
Magnetics
Calcination
Materials by Attribute
Metallurgy
lcsh:R
Chemical Compounds
Energy and Power
People and Places
Microscopy
Electron
Scanning
lcsh:Q
Zdroj: PLoS ONE, Vol 12, Iss 10, p e0186274 (2017)
PLoS ONE
ISSN: 1932-6203
Popis: Biomass was used as reducing agent to roast the Baotou low-grade limonite in a high temperature vacuum atmosphere furnace. The effect of calcination temperature, time and ratio of reducing agent on the magnetic properties of calcined ore was studied by VSM. The phase and microstructure changes of limonite before and after calcination were analyzed by XRD and SEM. The results show that in the roasting process the phase transition process of the ferrous material in limonite is first dehydrated at high temperature to formα-Fe2O3, and then it is converted into Fe3O4 by the reduction of biomass. With the increase of calcination temperature, the magnetic properties of the calcined ore first increase and then decrease. When the temperature is higher than 650°C, Fe3O4 will become Fe2SiO4, resulting in reduced the magnetic material in calcined ore and the magnetic weakened. The best magnetization effect was obtained when the roasting temperature is 550°C, the percentage of biomass was 15% and the roasting time was 30min. The saturation magnetization can reach 60.13emu·g-1, the recovery of iron was 72% and the grade of iron was 58%.
Databáze: OpenAIRE
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