Preparation Of Nano-Magnesium Oxide And Research On The Relationship Between Particle Size Distribution And Activity

China has abundant magnesium resources which are widely distributed, such as salt brine, underground brine and salt lake brine. But we still need try our best to improve the utilization and development. Brine occupies an important place in the preparation of magnesium oxide as a liquid magnesium resource. If we use brine as raw material, the way and the cost will be very simple and low. The raw materials are so abundant that we can avoid the shortage and satisfy the market requirement of magnesium oxide. At the same time, it can improve the competitiveness in the domestic and international markets and realize their economic value and applied value.The prospect of Nano-magnesia is very broad especially for the high activity. They can be applied in metallurgy, aerospace, electronics, food and other areas of economic. The quality and quantity of the products have a direct impact on the development of the national economy. People pay more and more attention to the activity and application of Nano-magnesium oxide, thus we can gradually make it diversified, global and international and increase the added value.In this paper, brine and magnesium chloride (analytical reagent) are used as materials. This is a method of preparing Nano-magnesia which can be prepared by direct precipitation. We can enlarge the applications and development of brine. Also, it takes full advantage of our natural resources and obtains high activity Nano-magnesia.Low cost and no pollution cause the development and requirement of social progress.The main research contents are follows:1. Nano-sized MgO by ammonium carbonate direct precipitation methodThe precursor of MgO was prepared by direct precipitation method with different conditions, such as reaction temperature, concentration, calcinations time and surfactant, with Six hydrated magnesium chloride and ammonium carbonate. MgO particles were prepared by calcining the precursor in the air. The particle size distribution of the products prepared with different conditions was measured by laser particle analyzer. We can summarize the changing rule of the particle size of the product. The decomposition temperature of precursor was confirmed by TG-DTA. The product prepared with the best condition was characterized by XRD and SEM. Finally, under the optimum conditions, the Nano-sized MgO with average particle size of50nm could be prepared and the morphology was dumbbell.2. Research on the relationship between particle distribution and activity of MgOWe prepare a number of different size particle distribution of MgO with different precipitators. The particle size distribution of the products prepared with different conditions was measured by laser particle analyzer. The results show that sodium hydroxide is the best precipitator. The activity of MgO is measured by the method of citric acid and explore the influence factors. The products are characterized by XRD and SEM. The results show that temperature can not only influence the form of the magnesium oxide, also affect their appearance.3. high active Nano-MgO prepared by brine-sodium carbonate and hydroxideIn this experiment, industrial brine and sodium carbonate and sodium hydroxide mix together to prepare MgO.We can change the reaction conditions to obtain high activity magnesia and characterize the products by means of XRD, SEM. The results show that the activity (CAA)of high active magnesium oxide is19.69s and the content of MgO is92.85%.The morphology of the product is petaloid.