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This study focuss on a dielectric and transformation properties of iron sulfide including pyrite, pyrrhotite, and troilite by microwave heation. The relative magnetic loss factors of pyrite at both 915 MHz and 2.45 GHz are between 0.2 and 0.4. This shows that pyrite is not a strong magnetic substance. Also, the decrease of the relative magnetic constant of pyrite is caused by the increase of electrical conductivity of sample, as indicated by the variation of permittivity. The large dielectric constant and loss factor of pyrrhotite at temperatures below 200°C suggest that this phase has good microwave absorption capability at microwave frequency. The dielectric constant and loss factor of troilite are found to be highly temperature and frequency dependent.

Dielectric Properites of Iron Sulfide in Coal by Microwave Irradiation