过程工程学报
過程工程學報
과정공정학보
The Chinese Journal of Process Engineering
2009年
6期
1137-1141
,共5页
高枫%冯乃祥%任保轶%孙怀宇
高楓%馮迺祥%任保軼%孫懷宇
고풍%풍내상%임보질%손부우
氧化镁%真空还原%热力学分析%还原温度%还原时间
氧化鎂%真空還原%熱力學分析%還原溫度%還原時間
양화미%진공환원%열역학분석%환원온도%환원시간
MgO%vacuum reduction%thermodynamic analysis%reduction temperature%reduction time
对硅铁还原氧化镁进行了热力学分析,计算出硅铁还原氧化镁的化学反应自由能和临界反应温度,表明造渣反应和真空条件可使临界反应温度由3846 K降到1358 K.实验得出还原温度1473 K、10.13 Pa真空度、还原时间1 h及CaO/MgO摩尔比1.4时,镁还原率达94.42%,还原金属镁纯度达98.36%,渣团物相主要为Ca_2SiO_4和SiO_2.
對硅鐵還原氧化鎂進行瞭熱力學分析,計算齣硅鐵還原氧化鎂的化學反應自由能和臨界反應溫度,錶明造渣反應和真空條件可使臨界反應溫度由3846 K降到1358 K.實驗得齣還原溫度1473 K、10.13 Pa真空度、還原時間1 h及CaO/MgO摩爾比1.4時,鎂還原率達94.42%,還原金屬鎂純度達98.36%,渣糰物相主要為Ca_2SiO_4和SiO_2.
대규철환원양화미진행료열역학분석,계산출규철환원양화미적화학반응자유능화림계반응온도,표명조사반응화진공조건가사림계반응온도유3846 K강도1358 K.실험득출환원온도1473 K、10.13 Pa진공도、환원시간1 h급CaO/MgO마이비1.4시,미환원솔체94.42%,환원금속미순도체98.36%,사단물상주요위Ca_2SiO_4화SiO_2.
Based on thermodynamic analysis, the Gibbs free energy and critical temperature of deoxidization of MgO with ferrosilicon were calculated. The analysis showed that the slagging reaction and vacuum could make critical temperature decrease from 3846 K to 1358 K below. Corresponding experimental result showed that Mg metal reduction rate of 94.42% was achieved under the conditions of reduction temperature 1200℃, 10.13 Pa vacuum, and reaction time 1 h in the reactor with a molar ratio of CaO to MgO of 1.4, and pure metallic magnesium (98.36%) was prepared, the main compounds in the slag were Ca_2SiO_4 and SiO_2.
