论文部分内容阅读
简要分析了真空碳热还原煅白制取金属镁过程中镁蒸气冷凝所遇到的主要问题,并通过理论计算和实验提出了解决方案。首先从实验结果的对比中发现,真空碳热还原煅白的冷凝产物会发生燃烧甚至爆炸主要是钠钾等碱金属的自燃所引起的。在对冷凝区的热量分布进行计算分析后,对相应设备进行了改造,结果表明,改造后的冷凝设备对金属镁的直收率有很大提升。最后,对现存的传统真空冷凝设备提出了多级冷凝的改造方案,实验结果表明冷凝产物形貌发生明显改善,晶粒尺寸加大、氧化率降低,钾钠蒸气与镁蒸气分级冷凝,达到安全生产的要求。
The main problems encountered in the condensation of magnesium vapor in the process of magnesium metal reduction by vacuum carbothermal reduction were briefly analyzed, and the solutions were proposed through theoretical calculations and experiments. First of all, it is found from the comparison of the experimental results that the condensation product of vacuum carbothermal reduction calcined white will cause combustion or even explosion mainly caused by spontaneous combustion of alkali metals such as sodium and potassium. After calculating and analyzing the heat distribution in the condensing zone, the corresponding equipment was modified. The results show that the converted condensing equipment has a great improvement on the direct yield of metallic magnesium. Finally, the existing multi-stage condensing retrofit scheme is proposed for the existing vacuum condensing equipment. The experimental results show that the morphology of the condensate product is obviously improved. The grain size is increased, the oxidation rate is decreased, and the sodium-potassium vapor and the magnesium vapor are condensed by stages Production requirements.