Hydrometallurgy Purification And Industrialization Of Ultra Fine Amorphous Boron Powder

Ultra fine amorphous boron powder has been prepared by a series of integrated methods including heating reduction with Magnesium and acid dissolution. Its main technologic standards have reached U.S.A. SB Boron 92(MIL-B-S1092). At present, the task is realizing industrialization of acid soaking technology through putting industrial test into practice.The value of activation energy was obtained through kinetic calculation and analysis of acid soaking process. Considering activation energy, the operating conditions of industrialization and volatilization of hydrochloric acid, 80℃ was selected as the best temperature. As results, the controlling step is proliferation and the methods of strengthening this process are speeding up stirring or grinding reactants.The earlier task was seeking the operating instructions. It was found boron powder with different purity can be prepared by different acid dissolution step: content of boron is 25.16% under the first acid soaking phase, 39.62% under the second, 70.63% under the third, 87.83% under the forth, 90.11% under the fifth, 90.25% under the sixth and the final purity of production is 91.31%. These can meet all kinds of requires of markets. The next assignment was the study of industrial test. In these periods, considering the production cost, economic benefit, environmental protection, comprehensive utilization and other new problems such as the worse content of insoluble in H₂O₂ etc, the improved acid dissolution technology was achieved: first, three times hot water soaking at 80 ℃; second, six times hydrochloric acid soaking; third, several times distilled...