蛋白土与硫酸铵煅烧反应产物及过程动力学

doi:10.16085/j.issn.1000-6613.2018-0522

化工进展 ›› 2018, Vol. 37 ›› Issue (12): 4543-4550.DOI: 10.16085/j.issn.1000-6613.2018-0522

蛋白土与硫酸铵煅烧反应产物及过程动力学

刘阳钰, 贾宏伟, 潘永泰, 郑水林, 孙志明, 李铭哲

中国矿业大学(北京)化学与环境工程学院, 北京 100083

收稿日期:2018-03-19 修回日期:2018-07-04 出版日期:2018-12-05 发布日期:2018-12-05
通讯作者: 郑水林,教授,博士生导师,研究方向为资源综合利用与非金属深加工、粉体加工与矿物材料制备技术。
作者简介:刘阳钰(1991-),男,博士研究生,研究方向为非金属矿物材料。E-mail:cumtblyy@163.com。
基金资助:
中央高校基本科研业务费项目（2010YH10，2015QH01）。

Reaction products and kinetic process for the calcination of opoka with ammonium sulfate

LIU Yangyu, JIA Hongwei, PAN Yongtai, ZHENG Shuilin, SUN Zhiming, LI Mingzhe

School of Chemical and Environment Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China

Received:2018-03-19 Revised:2018-07-04 Online:2018-12-05 Published:2018-12-05

摘要/Abstract

摘要： 蛋白土具有良好的应用前景，但是其自然白度较低制约了其开发应用。蛋白土硫酸铵煅烧法可去除其中的显色金属氧化物，提高蛋白土的白度，同时提取其中Al₂O₃。本文采用热重-差示扫描量热（TG-DSC）、同步热分析与红外质谱（TG-FTIR-MS）联用系统，结合X射线衍射对煅烧过程的固相及气相产物进行了表征分析，明析了其化学过程。结果表明，蛋白土中的Al₂O₃和Fe₂O₃在200~350℃时反应生成（NH₄）₃（Al，Fe）（SO₄）₃，同时逸出NH₃和H₂O；350~450℃时，进一步反应转化为NH₄（Al，Fe）（SO₄）₂，同时逸出NH₃、H₂O、SO₂和O₂；450~550℃时，NH₄（Al，Fe）（SO₄）₂分解生成（Al，Fe）₂（SO₄）₃，同时逸出NH₃、H₂O、SO₂和O₂；550~750℃时（Al，Fe）₂（SO₄）₃分解生成Al₂O₃和Fe₂O₃，同时逸出SO₂和O₂。采用Kissinger微分法与Ozawa积分法分别计算出4个阶段表观活化能后取二者平均值，分别为101.74kJ/mol、104.52kJ/mol、201.40kJ/mol、232.51kJ/mol，并获得对应4个热化学反应阶段的频率因子、反应级数和动力学方程。

关键词: 蛋白土, 硫酸铵煅烧, 化学过程, 反应, 动力学

Abstract: Opoka has a good application prospect, but its natural whiteness is low, which restricts its development and application. The opoka ammonium sulfate calcining method can remove the coloured metal oxide, improve the whiteness of opoka, and extract the Al₂O₃. The solid phase and gaseous products of calcining process were characterized by X-ray diffractometry, TG-DSC and simultaneous thermogravimetry analyzer-Fourier transform infrared spectroscopy-mass spectrometer (TG-FTIR-MS), and the chemical process was clearly analyzed. The results showed that, at 200-350℃, the Al₂O₃ and Fe₂O₃ in opoka react to form (NH₄)₃(Al, Fe)(SO₄)₃ and release NH₃ and H₂O; at 350-450℃, the further reaction to form NH₄(Al, Fe)(SO₄)₂ and release NH₃, H₂O, SO₂ and O₂; at 450-550℃, NH₄(Al, Fe)(SO₄)₂ decomposes to form (Al, Fe)₂(SO₄)₃ and release NH₃, H₂O, SO₂ and O₂; at 550-750℃ (Al, Fe)₂(SO₄)₃ decomposes to form Al₂O₃ and Fe₂O₃ and release SO₂ and O₂. By Kissinger and Ozawa methods, the values of apparent activation energy for the four steps are 101.74kJ/mol, 104.52kJ/mol, 201.40kJ/mol and 232.51kJ/mol, respectively. The frequency factor, reaction order and kinetic equations corresponding to the four thermo-chemical reaction stages in the calcination process were established.

Key words: opoka, ammonium sulfate calcination, chemical process, reaction, kinetics

中图分类号:

X754

刘阳钰, 贾宏伟, 潘永泰, 郑水林, 孙志明, 李铭哲. 蛋白土与硫酸铵煅烧反应产物及过程动力学[J]. 化工进展, 2018, 37(12): 4543-4550.

LIU Yangyu, JIA Hongwei, PAN Yongtai, ZHENG Shuilin, SUN Zhiming, LI Mingzhe. Reaction products and kinetic process for the calcination of opoka with ammonium sulfate[J]. Chemical Industry and Engineering Progress, 2018, 37(12): 4543-4550.

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蛋白土与硫酸铵煅烧反应产物及过程动力学

Reaction products and kinetic process for the calcination of opoka with ammonium sulfate

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