Metals and materials international

The Korean Institute of Metals and Materials (대한금속재료학회)
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Microwave Heating Characteristics of Magnetite Ore

  • Rajavaram, Ramaraghavulu (Department of Materials Science and Engineering, Korea University) ;
  • Lee, Jaehong (Department of Materials Science and Engineering, Korea University) ;
  • Oh, Joon Seok (Department of Materials Science and Engineering, Korea University) ;
  • Kim, Han Gyeol (Department of Materials Science and Engineering, Korea University) ;
  • Lee, Joonho (Department of Materials Science and Engineering, Korea University)
  • Received : 2016.01.18
  • Accepted : 2016.05.30
  • Published : 2016.11.20
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Abstract

The heating characteristics of magnetite ore under microwave irradiation were investigated as a function of incident microwave power, particle size, and magnetite ore mass. The results showed that the heating rate of magnetite ore is highly dependent on microwave power and magnetite ore mass. The maximum heating rate was obtained at a microwave irradiation power of 1.70 kW with a mass of 25 g and particle size between $53-75{\mu}m$. The volumetric heating rate of magnetite ore was investigated by measuring the temperature at different depths during microwave irradiation. Microwave irradiation resulted in modification of the microstructure of the magnetite ore, but new phases such as FeO or $Fe_2O_3$ were not formed. In addition, the crystal size decreased from 115 nm to 63 nm after microwave irradiation up to 1573 K.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea (NRF), Korea Small and Medium Business Administration, Ministry of Trade, industry & Energy (MI)

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