论文部分内容阅读
采用冷凝区金属Mg直收率、X射线衍射(XRD)和扫描电镜(SEM)等手段和方法,研究了冷凝温度和温度梯度对真空碳热法还原氧化镁产生的Mg蒸气冷凝的影响。研究结果表明,在30~100 Pa时,在温度梯度不变的条件下,冷凝温度越接近Mg的露点温度,直收率越高;当冷凝温度合适时,温度梯度越小越有利于Mg蒸气的结晶。冷凝物的SEM和X射线能谱仪分析表明,当冷凝温度接近Mg的露点且温度梯度较小时,所得金属Mg拥有较大晶粒尺寸且排列规则致密,金属Mg的含量可达到90.05%。冷凝物的XRD分析表明,合适的冷凝温度条件下,温度梯度的减小可以增大结晶Mg的晶粒尺寸。
The influence of condensation temperature and temperature gradient on the condensation of Mg vapor produced by vacuum carbothermal reduction of magnesium oxide was studied by means of direct metal Mg concentration in the condensing zone, X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that under the condition of constant temperature gradient, the condensation temperature is closer to the dew point of Mg at 30 ~ 100 Pa, the higher the direct yield is. When the condensing temperature is suitable, the smaller the temperature gradient, the more favorable the Mg vapor Of crystallization. The results of SEM and XRD showed that when the condensation temperature was close to the dew point of Mg and the temperature gradient was small, the obtained Mg had larger grain size and regular arrangement with the content of Mg up to 90.05%. XRD analysis of the condensate showed that the decrease of the temperature gradient can increase the grain size of crystalline Mg under the proper condensation temperature conditions.