流化床法制备硅化镁的工艺研究

在一定的温度,高纯氢气氛围下,以硅粉、镁粉为原料,于流化床反应器中制备硅化镁.考察了硅粉与镁粉粒度、反应温度、反应时间、不同原料配比以及载气流量对反应的影响.实验结果表明,实验最佳条件是镁粉与硅粉摩尔比为2.05∶1、镁粉和硅粉的粒度在100～160目且粒度相差20目以内、反应温度570℃、反应时间2.0h、载气流量为3.0～5.0 L/min.在此实验条件下,硅化镁的质量含量≥98.3％.

Process Study on Preparation of Magnesium Silicide by a Fluidized Bed

At a certain temperature, high pure hydrogen atmosphere, magnesium silicide is prepared from silicon particle and magnesium particle by a fluidized bed reactor. The effects of silicon and magnesium particle size, reaction temperature, reaction time, raw materials ratio and flow rate of carrier gas are investigated. The experimental results show that the optimum reaction conditions are as follows： the mole ratio of magnesium to silicon is 2.05 ： 1, Magnesium and silicon particle size in the 100-160 mesh and particle size differ within 20 mesh, the reacition temperature is 570 ℃, the reaction time is 2.0 hours and the flow rate of carrier gas is 3.0-5.0 L/min. Under the optimum reaction condition, the mass fraction of magnesium silicide is greater than 98.3 %.