Preparation method of ultrafine amorphous boron powder
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A technology of amorphous boron powder and boron powder, which is applied in the direction of boron, boron/boride, etc., can solve the problems of pollution, average particle size, and discontinuous production cannot be further developed, so as to reduce costs, The effect of improving efficiency
Pending Publication Date: 2020-10-16
LANZHOU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology
Among them, due to the constraints of low current efficiency, harsh working environment and discontinuous production, molten salt electrolysis cannot be further developed and promoted.
Although diborane cracking and boron halide hydrogen reduction can obtain high-purity boron powder, the high-demand operating environment and serious pollution restrict the wide-scale promotion and application of this method
Self-propagating metallurgy can produce boron powder with a boron content of 92.43%, but its average particle size cannot meet the requirements of the US SB Boron95 for boron powder. SBBoron95 requires an average particle size of boron powder of 0.8-1.0 μm
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Embodiment 1
[0022] combine figure 1 Shown, the concrete process of the superfine amorphous boron powder of preparation high purity, low particle size is as follows:
[0023] Step S1, weighing the reaction raw materials. In terms of mass percentage, the reaction raw materials include Mg powder 41.65%, B 2 o 3 Powder 36.15%, diluent powder 22.20%, wherein the diluent powder is KCl powder. In addition, it is required that the Mg powder should reach more than 95% of industrial purity, and B 2 o 3 The powder reaches more than 95% of analytical purity and the KCl powder reaches more than 99.5% of analytical purity.
[0024] In step S2, the reaction raw materials are mixed, and the mixed reaction raw materials are pressurized to obtain a round cake-shaped body.
[0025] In this embodiment, firstly, the reaction raw materials are mixed by means of a QM-1SP4 planetary ball mill. Among them, the speed of the ball mill is set to 150r / min, the ratio of ball to material is set to 2:1, and the m...
Embodiment 2
[0033] Adopt the same method as Example 1 to prepare amorphous boron powder, the only difference is that in step S1, the mass percentage of Mg powder in the mixed powder for preparing amorphous boron powder is 38.78%, B 2 o 3 The mass percentage of the powder is 33.66%, the KCl powder is 27.56%, and the amorphous boron powder marked A2 is obtained.
Embodiment 3
[0035] Adopt the same method as Example 1 to prepare amorphous boron powder, the only difference is that in step S1, the mass percentage of Mg powder in the mixed powder for preparing amorphous boron powder is 36.28%, B 2 o 3 The mass percentage of the powder is 31.49%, the KCl powder is 32.23%, and the amorphous boron powder marked A3 is obtained.
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Abstract
The invention belongs to the technical field of boron powder preparation. In order to obtain superfine amorphous boron powder with high purity and low particle size, the invention discloses a preparation method of the superfine amorphous boron powder. The preparation method of the superfine amorphous boron powder specifically comprises the following steps: S1, weighing reaction raw materials, wherein the reaction raw materials comprise the following components in percentage by mass: 40-48% of Mg powder, 35-42% of B2O3 powder and 10-24% of diluent powder, S2, mixing the reaction raw materials,and pressurizing the mixed reaction raw materials to obtain a cake-shaped green body, S3, carrying out a magnesiothermic reaction to prepare a block containing boron powder, and S4, by an acid pickling-water washing immersion cleaning process, carrying out impurity removal on the obtained blocky matter containing the boron powder, so that the high-purity and low-particle-size ultrafine amorphous boron powder is obtained. By adopting the method disclosed by the invention, the ultrafine amorphous boron powder with high purity and low particle size can be obtained, the manufacturing cost can be reduced, and the production efficiency can be improved.
Description
technical field [0001] The invention belongs to the technical field of boron powder preparation, and in particular relates to a preparation method of ultrafine amorphous boron powder. Background technique [0002] Amorphous boron powder has the advantages of large specific surface area, high combustion calorific value, and convenient portability, and is widely used. It is mainly used in the synthesis of new metallurgical materials, boron-rich fuel in aviation, aerospace and military fields, and also as an initiator for airbags. [0003] At present, the methods for preparing amorphous boron powder include molten salt electrolysis, diborane cracking, hydrogen reduction of boron halides, and metallothermic reduction. Among them, due to the constraints of low current efficiency, harsh working environment and discontinuous production, molten salt electrolysis cannot be further developed and promoted. Although high-purity boron powder can be obtained by diborane cracking and boro...
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