FLASH DEHYDRATION OF ULEXITE AND INVESTIGATION OF DEHYDRATION KINETICS FROM THERMOGRAVIMETRIC DATA


ERSAHAN H., TUNC M. , EKMEKYAPAR A., YAPICI S.

THERMOCHIMICA ACTA, cilt.250, ss.125-135, 1995 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 250 Konu: 1
  • Basım Tarihi: 1995
  • Doi Numarası: 10.1016/0040-6031(94)01978-p
  • Dergi Adı: THERMOCHIMICA ACTA
  • Sayfa Sayıları: ss.125-135

Özet

The flash dehydration of a ulexite mineral in an entrained flow reactor was investigated. Flash dehydration experiments were carried out in the range 400-700 degrees C with material of particle size -425+300 mu m. The weight loss at 700 degrees C dehydration temperature was measured as 22%. A thermal gravimetric method was used to obtain the activation energy and rate constants for the dehydration of ulexite. The activation energy was in the range 48.2-53 kJ mol(-1) for different particle sizes. The rate constants for different particle sizes were found to vary between 1.8 x 10(-4) and 1.35 s(-1) in the temperature range 110-530 degrees C.