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

被引：11

作者：

ERSAHAN, H

TUNC, M

EKMEKYAPAR, A

YAPICI, S

机构：

[1] ATATURK UNIV,INST SCI,ERZURUM 25240,TURKEY

[2] ATATURK UNIV,FAC ENGN,DEPT CHEM ENGN,ERZURUM 25240,TURKEY

来源：

THERMOCHIMICA ACTA | 1995年 / 250卷 / 01期

关键词：

DEHYDRATION; DTA; KINETICS; TGA; ULEXITE;

D O I：

10.1016/0040-6031(94)01978-P

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

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.

引用

页码：125 / 135

页数：11

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