菱镁矿热分解微分方程的建立

Abstract

Abstract: Thermal decomposition process of magnesite was investigated by means of TG-DSC.Results showed that magnesite decomposition was in one phase reaction.The apparent activation energy and pre-exponential factor (lg A)were calculated by Kissinger and Ozawa-Doyle equations,and the values of them were 177.14 kJ/mol and 7.39 s^-1,respectively.According to Coats-Redfern equation,multiple linear regressions were carried out with common mechanism functions of solid thermal decomposition.Furthermore,it was obtained from Malek method that the process of magnesite thermal decomposition belonged to three-dimensional diffusion mechanism (D3).And then,the differential equation was deduced as well.The specific heat capacity of MgCO³ was measured by means of DSC.And the expression of specific heat capacity was obtained by least square curve fitting method. 

Key words: magnesite, thermal decomposition, linear regression, specific heat capacity

CLC Number:

TQ132.2

LIU Xin-Wei, FENG Ya-Li, LI Hao-Ran. Establishment of differential equations of magnesite thermal decomposition[J]. INORGANICCHEMICALSINDUSTRY, 2011, 43(11): 15-.

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Inorganic Acid-Base-Salt Committee of CIESC

Establishment of differential equations of magnesite thermal decomposition

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