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真空对氧化镁碳热还原影响分析

2017-08-10 16:57 浏览:993    评论:0       
核心摘要:郁青春 杨 斌 刘大春 徐宝强 李志华 戴永年(真空冶金国家工程实验室 昆明理工大学,昆明 云南)摘 要:采用碳热还原方法研究氧

郁青春 杨 斌 刘大春 徐宝强 李志华 戴永年
(真空冶金国家工程实验室 昆明理工大学,昆明 云南)

摘 要:采用碳热还原方法研究氧化镁的还原。热力学研究表明真空条件下氧化镁和煤炭的反应容易发生,并随着体系压力的降低反应起始温度逐渐降低。由于固-固的扩散作用,实际的反应温度大于理论起始反应温度。在温度为1753K,压力为30Pa条件下,能够得到金属镁。随着CaF2加入量的增加,氧化镁的转化率增加。如何有效地阻止逆反应的发生需要进一步研究。

关键词:氧化镁;热力学;煤炭

Study on the thermodynamic and experimental carbothermic
reduction magnesia

YU Qing-chun1,2,3 YANG Bin1,2,3* XU Bao-qiang1,2,3 LIU Da-chun1,2,3
LI Zhi-hua1,2,3 DAI Yong-nian1,2,3

(1. National Engineering Laboratory for Vacuum metallurgy, Kunming University of Science and Technology, Kunming, Yunnan, China, 650093, 2. Vacuum metallurgy Key Laboratory for Nonferrous metal of Yunnan Province, Kunming University of Science and Technology, Kunming, Yunnan, China, 650093, 3. Faculty of Material and metallurgy Engineering, Kunming University of Science and Technology, Kunming, Yunnan, China, 650093)

Abstract: In this paper carbothermic reduction magnesia was studied. Thermodynamic analysis showed that the reaction between magnesia and coal occurred easily under vacuum conditions, and the initial reaction temperature decreased with reducing the total pressure. The actual reaction temperature is higher than the initial reaction temperature due to the solid-solid phase diffusion. Under the temperature of 1753K and the pressure of 30Pa, metal magnesium was obtained. Conversion degree increased with increasing CaF2. Prevention of back reaction of carbothermic reduction magnesia needs further investigation.

Keywords: Magnesia; thermodynamic; coal

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