Research On Carbothermic Reduction Process Of Products Of Magnesium Vapor Condensation Collecting In Vacuum

Magnesium and its alloy is the lightest metal structure material, it has good mechanical properties and physical properties, gradually become the world’s widely used metal materials. At present, the production technology of magnesium smelting mainly electrolytic process and silicothermic process. The carbothermic reduction process compared with the technology is now widely used what have a short production process, low energy consumption, low cost, high efficiency, low pollution, etc. As the world’s emphasis on efficient utilization of resources and ecological environment protection and attention, carbothermic reduction process has very important practical significance.Researchers at home and abroad on carbothermic reduction process magnesium smelting technology conducted many studies, but the carbothermic reduction of magnesium vapor condensation process Mg—CO inhibition of reverse reaction has not been solved of effectively. Study carbothermic reduction of magnesium vapor condensation collect condition and control the reverse reaction of Mg—CO have important practical application value.Based on the carbothermic reduction process of magnesium vapor condensation collection problem in vacuum. In the theoretical analysis of magnesium vapor condensation mechanism, on the basis of magnesia and graphite as raw material, the vacuum vertical tube furnace as the main equipment, the experiment study of temperature, pressure and inert gas argon to collect the influence of magnesium vapor condensation. Applying the analysis methods such as X-ray diffraction(XRD) and scanning electron microscopy(SEM). Discusses the carbothermic reduction process of magnesium vapor condensation collect conditions and adverse reaction of control measures in vacuum. The main results were as follows:① Under the condition of system pressure is 1 KPa, theoretical analysis of magnesium vapor condensation crystallization suitable temperature range of 924 K to 975 K, by means of vacuum reactor condensing temperature distribution test, and experimental results the optimum condensing temperature range of 950 K(+ 20). Through the thermodynamic analysis and experimental results indicate that when the system pressure drops, suppresses the Mg—CO in the process of magnesium vapor condensation reaction generated Mg2C3, reduce the adverse reaction, improve the product purity.② Access to the experimental results show that argon gas can effectively reduce Mg—CO back reaction, condensation products of the same experimental conditions of metal magnesium content increases by about 31%. When argon gas flow rate was 3.5 L/min, the maximum condensation product of metal yield 95.64%, the purity of magnesium was 91.43%, the microstructure of dendritic.③ Through the experiment research for 1 KPa when the system pressure, reaction temperature of 1723 K, the reduction of carbon thermal reduction reaction rate was 55.6%. When in the process of carbon thermal reduction reaction by argon flow rate of 3.5 L/min, the carbon thermal reduction reaction activation energy from 15.93 KJ/mol to 7.86 KJ/mol, reduction of carbon thermal reduction reaction rate increased by 21.7%.