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Magnetic properties of an iron ore sample after microwave heating

机译：微波加热后铁矿石样品的磁性

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The effect of microwave radiation on the magnetic properties of an iron ore was investigated. Four samples from Choghart Iron ore were used in this research. Three samples were treated for 30, 60 and 120 s respectively, in a multi mode microwave oven with a frequency of 2.45 GHz and a maximum power of 1100W. The magnetizations of non-treated and microwave-treated samples were determined using a vibrating sample magnetometer (VSM). With increasing in radiation time to 60 s, the total magnetism saturation and remanent magnetization of the samples were increased. The results show that with further increasing in microwave radiation time up to 120 s, localized sample melting was occurred and the total magnetism saturation and remanent magnetization were decreased. The results showed that the sample composes ferromagnetic and paramagnetic fractions. With increasing in microwave radiation time the magnetic susceptibility of the paramagnetic fraction was decreased from 0.0111 to zero whereas the magnetic susceptibility of the ferromagnetic fraction initially was increased from 0.0687 to 0.3879 then decreased to 0.1894 (at 120 s radiation time). It was confirmed that microwave radiation has a significant effect upon magnetic properties of iron ore. However, there is a limited condition, excessive radiation has a negative effect and reduces the magnetic susceptibility of iron ore.
机译：研究了微波辐射对铁矿石磁性能的影响。这项研究使用了来自Choghart铁矿石的四个样本。将三个样品分别在频率为2.45 GHz，最大功率为1100W的多模式微波炉中分别处理30、60和120 s。使用振动样品磁力计（VSM）确定未处理和微波处理的样品的磁化强度。随着辐射时间增加到60 s，样品的总磁饱和度和剩余磁化强度增加。结果表明，随着微波辐射时间的进一步增加（至120 s），样品发生局部熔化，总磁饱和度和剩余磁化强度降低。结果表明，样品由铁磁性和顺磁性部分组成。随着微波辐射时间的增加，顺磁性部分的磁化率从0.0111降低到零，而铁磁性部分的磁化率最初从0.0687升高到0.3879，然后降低到0.1894（在120 s的辐射时间）。已经证实微波辐射对铁矿石的磁性能具有显着影响。但是，条件有限，过度辐射会产生负面影响并降低铁矿石的磁化率。

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