熔融还原炼镁热力学分析和模拟

Thermodynamical analysis and simulation of smelting reduction process in magnesium production

为了提高现有硅热还原炼镁工艺中原料之间的反应速度,提出熔融还原炼镁新技术。在煅烧白云石中添加适量的Al2O3和SiO2,使整个体系在反应时呈完全熔融状态,从而加快反应速度。通过软件模拟、热力学分析和实验验证,在适当配比下于1 600℃可以获得完全熔化的CaO-MgO-Al2O3-SiO2四元系。通过对熔融还原反应的热力学计算得出,平衡状态下还原温度为1 600℃时,对应镁蒸汽的露点为870℃。结果表明熔融还原炼镁新技术是可行的。

In order to improve the response speed of materials in silicothermic reduction process for magnesium production, a new technology-smelting reduction process is presented. Adding an appropriate amount of A12（）3 and SiO2 can make slag completely melt in whole reduction process, thus the reaction rate can be sped up. Through software simulation, thermodynamic analysis and experimental verification, it＇s found that completely molten Ca（）-Mg（）-AI2O3-Si（）2 slag can be got at 1 600℃ with appropriate material component. The new reduction process is thermodynamically analyzed, and the results show that in equilibrium state, magnesium vapor is when the reduction temperature is 1 600℃, the dew-point temperature of the 870℃. It suggests that the new technology is feasible.