Details

Autor(en) / Beteiligte

• Reinosa, J.J.
• García-Baños, B.
• Catalá-Civera, J.M.
• Fernández, J.F.

Titel

A step ahead on efficient microwave heating for kaolinite

Ist Teil von

• Applied clay science, 2019-02, Vol.168, p.237-243

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The thermal evolution of kaolin clay under microwave radiation shows an unexpected large heating rate up to 500 °C/min for temperatures >650 °C. Such heating rate is associated with a resistivity drop of >103 Ω·m observed after the dehydroxylation process of the kaolin structure. The high efficiency of the microwave heating effect is correlated with the presence of surface carriers that absorbs microwaves electromagnetic field. The layered structure of the clay-based materials allows the appearance of charge carriers at the surface of the crystal lattice that is electromagnetically activated. This effect represents a breakthrough in the efficient use of microwaves energy in order to produce efficient thermal treatments in large volume of non-metallic minerals with a drastic reduction of the greenhouse gasses for mass production industries. •Kaolin shows large heating rate under MW-energy associated to a resistivity drop.•Dehydroxylation process is not responsible of the resistivity drop.•Depending on temperature range, the heating mechanism under MW-energy varies.•The mechanism is promoted by charges apparition at the surface of kaolin particles.