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Indexed by:期刊论文

Date of Publication:2009-12-30

Journal:3rd International Symposium on Fuctional Materials

Included Journals:SCIE、CPCI-S、Scopus

Volume:23

Issue:31-32

Page Number:3859-3867

ISSN No.:0217-9849

Key Words:Silicon steel magnesium oxide; preparation; impurity removal; adsorption

Abstract:In this work, silicon-steel magnesium oxide was fabricated from light-burned magnesia by several steps. Light-burned magnesia was first slaked and carbonated to afford magnesium bicarbonate liquor and then the impurities in the liquor were removed by activated carbon. The purified liquor was then pyrolyzed to obtain basic magnesium carbonate which was calcined to resulting silicon-steel magnesium oxide. The effects of carbonization time and solid to liquid ratio on the leaching process were discussed, and the impacts of adsorption temperature and time on removing impurities were also investigated. An insight into pyrolytic temperature, time and temperature rise rate indicates that fast temperature rising and high temperature lead to magnesia powders with large particle size while pyrolytic time has little effect on the particle size of magnesium oxide. The results show that the mass fraction of MgO in silicon-steel magnesium oxide is more than 99.5%, the mass fractions of CaO and Fe are less than 0.09% and 0.05%, boron content between 30-1000 ppm and more than 72.3% of magnesia particles are less than 5 mu in size by means of this process.