(1. 昆明理工大學 真空冶金國家工程實驗室，昆明 650093；
2. 昆明理工大學 云南省有色金屬真空冶金重點實驗室，昆明 650093；
3. 昆明理工大學 云南省復雜有色金屬資源清潔利用國家重點實驗室(培育基地)，昆明 650093；
4. 昆明理工大學 冶金與能源工程學院，昆明 650093)
摘 要: 采用物料氧化鎂還原率、XRD、SEM等手段與方法研究真空條件下煅白碳熱還原溫度、物料配比、碳熱還原保溫時間等對碳熱還原煅白制取金屬鎂工藝的影響。結(jié)果表明：在30~100 Pa時，碳熱還原溫度高于1 623 K后，氧化鎂的還原率明顯增加，有利于碳熱還原反應的進行。隨著焦煤還原劑與氧化鎂摩爾比的增大以及碳熱還原時間的延長，碳熱還原反應反應速率加大，還原率提高，當碳熱還原溫度為1 623 K、還原時間為4 h、配碳比為1.6時，氧化鎂還原率超過99%。因此，選擇適當?shù)慕姑哼€原劑與氧化鎂摩爾比值以及碳熱還原時間，在溫度高于1 623 K條件下，將有利于碳熱還原法煉鎂過程的順利進行與氧化鎂還原率的提高。
關鍵字: 煅白；碳熱還原；金屬鎂；真空冶金
（1. National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology,
Kunming 650093, China;
2. Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province, Kunming University of Science and Technology, Kunming 650093, China;
3. State Key Laboratory Breeding Base of Complex Nonferrous Metal Resources Clear Utilization in Yunnan Province, Kunming University of Science and Technology, Kunming 650093, China;
4. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology,
Kunming 650093, China）
Abstract:The temperature of calcined dolomite carbothermic reduction, molar ratio and carbothermic reaction time by calcined dolomite carbothermic reduction in vacuum were investigated by MgO reduction rate, XRD and SEM. The results show that the reduction rate of MgO clearly increases when temperature is higher than 1 623 K at 30-100 Pa, which is beneficial to MgO carbothermic reaction. The carbothermal reduction reaction rate increases with the increase of the molar ratio of coking coal reductant and magnesium oxide and carbon thermal reduction time at the carbon thermal reduction temperature of 1 623 K, the reduction time of 4 h and carbon ratio of 1.6, the magnesium oxide reduction rate is over 99%. Therefore, selecting the appropriate molar ratio of coking coal reductant and magnesium oxide and carbon thermal reduction time is beneficial to carbothermal reduction process for magnesium smelting going smoothly and magnesium oxide reduction rate increasing at the temperature higher than 1 623 K.
Key words: calcined dolomite; carbothermic reduction; metal magnesium; vacuum metallurgy
