【摘要】 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3846K降到1358K.实验得出还原温度1473K、10.13Pa真空度、还原时间1h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Ca2SiO4和SiO2.更多还原

【Abstract】 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 Ca2SiO4 and SiO2.更多还原