硅酸盐通报2012，Vol.31Issue(6)：1347-1351,5.
碳热还原镁橄榄石合成MgO-SiC复合粉体的热力学研究
The Thermodynamics Analysis on Synthesis of MgO-SiC Powders from Forsterite by Carbothermal Reduction
摘要
Abstract
In this paper, the reaction process of carbothermal reduction forsterite was studied by thermodynamics analysis and experiment. The thermodynamics calculation result shows; at 1923 K, Mg2SiO4 was reduced from easy to difficult according the sequence: MgO + SiC, MgO + Si, MgO + SiO, Mg + SiC, Mg + Si, Mg + SiO, Mg + SiO2. The higher flow rate could reduce the CO pressure, the temperature of reaction was lower. The experiment in different flow rate shows that the higher flow rate was benefit to the synthesis of MgO-SiC powders. The samples with 5. 0 molar ratio of carbon black to forsterite were calcined under nitrogen atmosphere at 1650 ℃ for 3 h with 100, 300, 500 mL/min of gas flow respectively. The phase compositions and microstructure of the synthesized powders were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM). The results show that MgO was octahedral and SiC was strip. Form the reaction process, we consider that MgO and SiO could be obtained by forsterite and carbon, which has decided the reaction.关键词
碳热还原/镁橄榄石/MgO-SiC复合粉体/热力学Key words
carbothermal reduction/ forsterite/ MgO-SiC powders/ thermodynamics分类
矿业与冶金引用本文复制引用
段红娟,祝洪喜,邓承继,员文杰,李君..碳热还原镁橄榄石合成MgO-SiC复合粉体的热力学研究[J].硅酸盐通报,2012,31(6):1347-1351,5.基金项目
国家科技支撑计划(2011BAB03B04)和国家自然科学基金(No.50874084)联合资助. （2011BAB03B04）
