【摘要】 随B2O3过量系数γ的增加,Mg热还原B2O3反应3Mg(l)+B2O3(l)=3MgO(s)+2B(s)的绝热温度(Tad)降低.当B2O3的过剩系数γ小于1 102时,反应才能以正常的自蔓延方式进行,此时该反应的绝热温度Tad等于1800K.由DTA曲线分析可知,该反应起始反应温度在750～810℃之间,属于液 液反应机制。通过计算可知:反应3Mg(l)+B2O3(l)=3MgO(s)+2B(s)的表观活化能E=18 8kJ·mol-1,反应级数为n=0.7.更多还原

【Abstract】 The adiabatic temperature (T_ad) of reaction 3Mg（l）+B₂O₃（l）=3MgO（s）+2B（s） will decrease with the increase of the excess coefficient of B₂O₃ in the thermal reduction of B₂O₃ with magnesium. This reaction can proceed in the way of self-propagating only if the excess coefficient （γ） of B₂O₃ is less than 1.102. Under this condition, the adiabatic temperature (T_ad) is 1 800 K. It is known through DTA curve that the beginning temperature of reaction is 750℃, and this reaction belongs to the mechanism of liquid-liquid reaction. It is also known by calculation of reaction 3Mg（l）+B₂O₃（l）=3MgO（s）+2B（s） that the apparent activation energy （E） is 18.8 kJ·mol^-1, and the reaction order （n） is 0.7.更多还原