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研究了微波加热褐铁矿的脱水过程,利用SEM和XRD分析了褐铁矿脱除结晶水前后矿相的转变.根据升温和失重变化曲线,采用微分法和积分法计算褐铁矿结晶水热分解过程的动力学参数,确定了褐铁矿在微波加热条件下脱水的反应机制.结果表明,该矿的化学式为2Fe2O3·3H2O;在脱去结晶水后转变为赤铁矿,Fe2O3和SiO2含量增加,晶粒尺寸减小,矿相相对变纯.褐铁矿在470~650 K内脱水反应的表观活化能为17.39~19.33kJ/mol,低于常规加热脱水反应的活化能,说明微波加热能降低反应的活化能;且其脱水反应机理符合Maple单行法则,属于随机成核和随后生长的化学反应控制.
The dehydration process of limonite by microwave heating was studied and the transformation of the mineral phase before and after the crystallization of limonite was analyzed by SEM and XRD.The differential equations between temperature and weight loss were used to calculate the hydrothermal The reaction mechanism of dehydration of limonite under microwave heating was determined.The results showed that the chemical formula of the ore was 2Fe2O3 · 3H2O, and after dewatered water, it changed into hematite, the content of Fe2O3 and SiO2 Increase, the grain size decreases and the mineral phase is relatively pure.The apparent activation energy of dehydration reaction of the limonite in the range of 470 ~ 650 K is 17.39 ~ 19.33 kJ / mol, which is lower than that of the conventional heating and dehydration reaction, indicating that microwave Heating can reduce the activation energy of the reaction; and the dehydration reaction mechanism complies with Maple’s single-row rule, belonging to the chemical reaction control of random nucleation and subsequent growth.