To promote the innovation of raw magnesium production technology, an integrated calcination and silicothermic reduction short process for magnesium production was experimentally studied on the laboratory scale in this article. The influences of the thermal decomposition temperature, silicothermic reduction temperature, pelletizing pressures and silicon ratio on the characteristics of producing the magnesium by the short process was studied. The crosslinking effect, including reactions between CO2 decomposed from dolomite and metal elements in ferrosilicon, microstructure change at thermal decomposition and silicothermic reduction stages, was analyzed and discussed. In addition, comparison of the magnesium reduction rate and production efficiency between the new short process and the traditional Pidgeon process was made. The results indicated that the decomposition and reduction temperatures have a more significant influence on the magnesium reduction process than the pelletizing pressure and silicon ratio. A decomposition temperature < 1000 °C and reduction temperature > 1100 °C was proven to be favorable for improving the magnesium reduction rate and production efficiency of the new short process. It was also found that the integrated short process for magnesium production can reach the same total reduction rate and has lower efficiency compared to the traditional process. The decrease of magnesium production efficiency in the new short process was expected to result from reduction of the contact area and hindering of diffusion between CaO·MgO molecules and Si(Fe) atoms because of the microstructure change and ferrosilicon consumption by the reactions between CO2 and metal elements in ferrosilicon. Preparing briquettes with additives of binder or ultrafine particles of raw materials was proposed and considered for further study to improve the production efficiency.

中文翻译：

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综合煅烧和硅热还原短流程生产镁（Mg）的实验研究

为推动原镁生产工艺的创新，本文在实验室规模上对煅烧硅热还原一体化镁生产短流程进行了实验研究。研究了热分解温度、硅热还原温度、造球压力和硅比对短流程制镁特性的影响。分析讨论了白云石分解的CO2与硅铁中金属元素的反应、热分解和硅热还原阶段的微观结构变化等交联效应。此外，对新型短流程与传统Pidgeon工艺的镁还原率和生产效率进行了比较。结果表明，分解和还原温度对镁还原过程的影响比造粒压力和硅比更显着。分解温度< 1000°C和还原温度> 1100°C被证明有利于提高新短流程的镁还原率和生产效率。还发现，与传统工艺相比，镁生产的一体化短流程可以达到相同的总还原率，但效率较低。新的短流程中镁生产效率的下降预计是由于 CO2 和硅铁中的金属元素。提出了用粘合剂或原料的超细颗粒添加剂制备型煤，并考虑进一步研究以提高生产效率。