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对以菱镁石为原料,以铝粉为还原剂的真空热还原炼镁技术进行了实验研究,通过热力学分析和对还原渣的物相分析,对铝热还原煅后菱镁石的机理进行了探讨。还原实验结果表明:当以还原反应4MgO+2Al=3Mg+MgO.Al2O3进行配料时,在还原温度1200℃,还原时间2 h,铝粉过量5%的条件下,氧化镁的还原率在72%以上,铝粉利用率在91%以上,还原过程的实际料镁比低于3.3∶1。进一步提高还原过程的铝粉加入量,可使镁铝尖晶石中的MgO进一步被还原,还原过程中的氧化镁还原率可达85%以上,但铝粉利用率下降至84%左右。
Magnesite as raw material, aluminum powder as reductant vacuum thermal reduction magnesium technology was studied through thermodynamic analysis and phase analysis of the reduction of slag, the thermal reduction of calcinia after the mechanism of magnesium Exploring. The results of the reduction experiments showed that the reduction rate of magnesium oxide was 72% when the reduction temperature was 1200 ℃, the reduction time was 2 h and the excess of aluminum powder was 5% when the reduction reaction was carried out with 4MgO + 2Al = 3Mg + MgO.Al2O3. , The utilization rate of aluminum powder is over 91%, and the actual material-magnesium ratio of the reduction process is less than 3.3: 1. Further increasing the amount of aluminum powder added in the reduction process can further reduce the MgO in the magnesium aluminate spinel. The reduction rate of magnesium oxide in the reduction process can reach over 85%, but the utilization rate of the aluminum powder is reduced to about 84%.