本文選題：菱鎂礦　切入點(diǎn)：動(dòng)力學(xué)　出處：《硅酸鹽通報(bào)》2017年06期

【摘要】：利用熱重(TG)分析法,對(duì)不同粒度菱鎂礦的熱分解過(guò)程進(jìn)行研究。根據(jù)Flynn-Wall-Ozawa法,擬合計(jì)算得到不同粒度菱鎂礦熱分解的活化能和指前因子。采用Thermo-kinetics軟件對(duì)可能性最大的5種動(dòng)力學(xué)機(jī)理函數(shù)進(jìn)行擬合,根據(jù)相關(guān)系數(shù)最大的原則確定最佳分解機(jī)理。研究結(jié)果表明:菱鎂礦熱分解的活化能隨菱鎂礦粒度的增大而減小,當(dāng)菱鎂礦的粒度由小增大時(shí),控制其熱分解過(guò)程的機(jī)理由化學(xué)反應(yīng)逐漸向顆粒內(nèi)部的傳熱和CO2的擴(kuò)散傳質(zhì)轉(zhuǎn)變;其熱分解過(guò)程的最可幾機(jī)理函數(shù)為R3模型,即三級(jí)相邊界擴(kuò)散反應(yīng),函數(shù)方程為G(α)=1-(1-α)~(1/3)。
[Abstract]:The thermal decomposition process of magnesite with different granularity was studied by thermogravimetric TG-analysis. According to Flynn-Wall-Ozawa method, The activation energy and preexponential factor of thermal decomposition of magnesite with different sizes were calculated by fitting. Five kinds of kinetic mechanism functions with the greatest possibility were fitted by Thermo-kinetics software. According to the principle of maximum correlation coefficient, the optimum decomposition mechanism is determined. The results show that the activation energy of magnesite thermal decomposition decreases with the increase of magnesite particle size, and when the magnesite size increases from small to small, The mechanism of controlling the thermal decomposition process is gradually transformed from chemical reaction to heat transfer inside particles and diffusion and mass transfer of CO2, and the most probable mechanism function of the thermal decomposition process is R3 model, that is, the third-order phase boundary diffusion reaction. The function equation is G1 (偽 -N-1) -1- 偽 ~ (1 +) 1 / 3 ~ (-1).
【作者單位】： 遼寧科技大學(xué)高溫材料與鎂資源工程學(xué)院;
【基金】：國(guó)家科技支撐計(jì)劃項(xiàng)目(2014BAB02B01)
【分類號(hào)】：TD912

【參考文獻(xiàn)】

相關(guān)期刊論文 前4條

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2 劉永杰;孫杰t，

本文編號(hào)：1666504