The Preparation Of Amorphous Boron Powder By The Method Of Heating Reduction With Magnesium Of High-temperature Synthesis And Its Industrialization

This research realizes the run-in production of high-purity amorphous boron powder in industry. Adopting the method of self-propagating ignition of heating surface being ignited by multiple points to define the preferred process parameters in the field of industrially producing amorphous boron: magnesium granularity 165⁷4μm, B₂O₃ granularity 165μm , weighty proportions of B₂O₃ and Mg was less than 3:1, reaction control temperature was780℃, reaction control pressure was O.OlMPa, holding for 30min, charge was 9kg/plate.By studying the effecting factors of H₂O₂ insoluble guideline, it was known that the main effecting factors were the reaction control temperature and material rate. The reaction control temperature must be at 800℃, and weighty proportions of B₂O₃ and Mg was less than 3:1.By probing the experience, the deoxidized furnace was modified. After the modification, every guideline of Amorphous Boron Powder was improved.In order to improve the purity, the secondary deoxidized experiment was taken to the lowbrow boron powder. Adding certain ration of B₂O₃ and Mg powder to the boron powder of 88% purity, and getting the preferred condition of secondary deoxidization by means of orthogonal test: Mg:B=0.4:l, B₂O₃:B=2:1, the heat preservation time was 30min, the reaction control temperature was 750℃. By such means, the impurity magnesium content was dropped to 3.02%, and its granularity was 1.17 μ m.