Title: Preparation of high-purity magnesia by carbon monoxide reduction pyrolysis of magnesium sulfate
Abstract: The magnesium sulfate heptahydrate prepared by magnesite and commercial sulfuric acid was dehydrated to prepare anhydrous magnesium sulfate.The high-purity magnesia was obtained by commercial magnesium sulfate and carbon monoxide.The influences of the particles diameter,gas flow,calcining temperature and time on the purity of prepared magnesium oxide were investigated.The optimum processing parameters of precipitation were obtained by single factor experiments,and the conditions were as follows: the grain diameter 51.8 μm,the carbon monoxide flow 30 mL/min,the calcining heat 800 ℃,the calcining time 2.0 h.The morphology of the magnesia was characterized by X-ray diffractometry(XRD) and scanning electron microscopy(SEM).The results indicate that sample particle has high purity to 99%,the average particle diameter is 40 nm.The single molecule surface with high specific surface area is porous and fluffy.By means of experiment and kinetic deduction,an empirical equation for the calcining process was established,and the apparent activation energy is 234.055 kJ/mol.The calcining process of magnesium sulfate can be simulated with a shrinking core model,which indicates that the control factor of the calcining process is the diffusion rate of reacting reagents in the redox process.
Publication Year: 2012
Publication Date: 2012-01-01
Language: en
Type: article
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