新型真空热还原法制镁工艺分析

通过对真空条件下A l-S i-Fe合金还原白云石煅白的热力学分析及实验研究,得到真空条件下还原反应的吉布斯自由能及反应临界温度,确定工艺可行性;所进行还原实验的结果表明:在还原温度1 443 K、还原时间2 h、真空度4 Pa、制团压力50 MPa条件下,可获得86.4%的镁收率,相比同等条件下硅热法镁还原率仅为73.9%。

Analysis of New Vacuum Reduction Process in Magnesium Production

The Gibbs free energy,the critical temperature and technological feasibility of reduction process were demonstrated by thermodynamic analysis and experimental research of vacuum thermal reduction of calcined dolomite with Al-Si-Fe alloy.The results show that under the condition of reduction temperature 1 443 K,reduction time 2 h,vacuity 4 Pa and forming pressure of pellet 50 MPa,the reduction rate of calcined dolomite is 86.4% which higher than 73.9% with silicothermic process.