Study on the Preparation Technology for High Pure Gallium Nitrate

Abstract

The highly efficient High Pressure Condensation process is designed and studied to synthesis high purity Gallium nitrate. The luminescent properties of phosphor materials using raw materials produced by this progress are investigated. The results show that Gallium nitrate can obtain by following process conditions: The molar ratio of the law materials Gallium oxide and nitric acid is 1:8 (nitrate concentration is 8 N), pressure vessels are used under 200 °C for 30 h ours, and then redundant water and nitric acid are removed and recycled by heating-condensing method. The luminescent properties of phosphors synthesized with the raw materials produced by this technology equal to or exceed that of the quality phosphors produced by a Japan corporation. The technology can prepare required purity Gallium nitrate with advantages of simple equipment, easy to operate, environments friendly and low cost. Introduction Gallium nitrate become one of the important basic materials and the main raw material in the research and production of new high efficiency Cancer treatment drugs [1], thin combustion nox control, fluorescent material, laser material. The demand of Gallium nitrate in the high technology field of new medicine, functional materials and catalysis has been growing as important chemical and pharmaceutical base materials. But the preparation of Gallium nitrate is very difficult and the cost of the mass production of Gallium nitrate increases due to the raw material of Gallium nitrate -Gallium oxide chemical activity is very stable, not easy to react with nitric acid. Therefore, Gallium nitrate preparation methods, especially the preparation of large quantities of high pure Gallium nitrate method become a research focus. Few Gallium nitrate preparation methods research work has been reported. Two methods were introduced in ‘’inorganic compounds synthesized handbook’’ edited by Japan Chemical society [2]: One is through the repeated evaporation, concentration of the reaction product of metal Gallium or Gallium oxide and concentrated nitric acid, Another method is to cool the Gallium or Gallium hydroxide dissolved nitric acid solution. Yongming Luo [3], Xihui Wang et al. [4] reported the improved method on the basis of the above greatly shorten the production cycle. Because it is very difficult for Gallium oxide to dissolve nitric acid at room temperature, the oxide coated membrane produced by the reaction of Gallium and nitric acid under room temperature prevent further reaction of Gallium with nitric acid, Gallium nitrate crystallization precipitation is hard, and crystallization separation need much time, it makes the whole production cycle is a long time and the cost of production is high. In addition, the use of excessive concentrated nitric acid, unceasingly water washing for the purification and enrichment will produce a large amount of sewage, these also increase the consumption of water and the pollution. The difficult of mass preparation of Gallium nitrate become the bottleneck of application of Gallium nitrate. Shorten the production cycle, reduce production costs, reduce or avoid pollution, reducing the consumption of water becomes Gallium nitrate production, especially mass production Gallium nitrate research key. In this paper, a novel Gallium nitrate preparation method is reported. The method has the advantages of short production cycle, simple equipments, easy to operate, water saving, energy saving, low cost, little pollution and easy to mass production. By this new method, different pure Gallium nitrate for medicine, laser materials, fluorescent material, and thin combustion nox control International Conference on Information Sciences, Machinery, Materials and Energy (ICISMME 2015) © 2015. The authors Published by Atlantis Press 497 can be prepared. The successful application of the Gallium nitrate produced by the method in the field of fluorescent material is also illustrated in the paper.