Novel Method to Prepare Magnesium by Aluminothermic Reduction of Magnesia and Calcium Hydroxide at Normal Atmosphere, 1223 K (950 A degrees C)

作者：Zhang, Teng^*; Du, Shuang-Ming; Sun, Wan-Chang; Zhang, Ju-Mei; Niu, Li-Bin; Zheng, Bin; Hua, Xiao-Hu

来源：Metallurgical and Materials Transactions B-Process Metallurgy and Materials Processing Science, 2017, 48(1): 488-496.

DOI：10.1007/s11663-016-0821-8

• CARBOTHERMIC REDUCTION
• MECHANICAL ACTIVATION
• KINETICS
• DOLOMITE
• MIXTURE
• ENERGY
• OXIDE
• MGO

An experimental apparatus was designed to investigate the aluminothermic reduction of the mixture of MgO and Ca(OH)(2) at normal atmosphere, 1223 K (950 A degrees C), with the molar ratio of MgO:Al:Ca(OH)(2) to be 3:2:1, reinforced by high-energy ball milling. The effect of mechanical milling time and content of grinding aid (sodium stearate) on the reduction ratio of MgO were studied. Moreover, the reduzate and reactant activated by ball milling were analyzed by X-ray diffraction, scanning electron microscopy, and energy-dispersive spectrometer analysis. The average grain sizes of Al and MgO activated by ball milling were also calculated by Scherrer formula. The results indicate that the reduction ratio of MgO is increased with increasing mechanical milling time and content of sodium stearate. The high-energy ball milling has good reinforcement on the aluminothermic reduction of MgO. Moreover, the strengthening mechanism of mechanical force on the reaction was further discussed.

• 出版日期2017-2
• 单位西安科技大学