Method and device for preparing high-purity nano boron powder by argon-hydrogen hot plasma method

A technology of plasma and nano-boron, which is applied in the field of high-purity nano-boron powder preparation by plasma method, can solve the problems of difficult control of particle size and purity, complex post-treatment purification process, and harsh process conditions, and achieve easy large-scale production, The effect of high purity and good application potential

Inactive Publication Date: 2016-06-22
SICHUAN YIJIE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at technical problems such as harsh technical conditions for the preparation of elemental boron by the traditional method, difficulty in controlling particle size and purity, complex post-treatment purification process, or difficulty in scaling up, etc., and provides a brand-new, simple process, controllable particle size of boron powder, no need for After-treatment purification obtains the preparation method of high-purity boron powder, provides a kind of device at the same time, can use BCl 3 Mass production of nano boron powder as raw material

Method used

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  • Method and device for preparing high-purity nano boron powder by argon-hydrogen hot plasma method
  • Method and device for preparing high-purity nano boron powder by argon-hydrogen hot plasma method
  • Method and device for preparing high-purity nano boron powder by argon-hydrogen hot plasma method

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Experimental program
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Effect test

Embodiment 1～3

[0042] Start the plasma power supply and generator, first use the discharge argon to replace and clean the device, and then gradually add hydrogen to the discharge gas to the required flow rate. After the device is stabilized, BCl is introduced from the upper part of the reactor 3 The steam is mixed with the high temperature plasma jet. Under the action of hydrogen plasma in the reaction tube, a reduction reaction occurs. During the experiment, hydrogen, BCl 3 , The argon flow ratio is maintained at 5:2.5:1.5; according to the BCl in Table 1 3 Adjust the flow rate of hydrogen and argon. By changing the discharge power, the yield of elemental boron was examined. The boron powder obtained from the powder collector is weighed with a balance, and divided by the mass of boron in the raw materials consumed by the reaction to obtain the yield of elemental boron. The results are shown in Table 1.

[0043] Table 1 Yield of elemental boron under different discharge conditions

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Embodiment 4

[0047] Start the plasma power supply and generator, first use the discharge argon to replace and clean the device, and then gradually add hydrogen to the discharge gas to the required flow rate. After the device is stabilized, BCl is introduced from the upper part of the reactor 3 The steam is mixed with the high temperature plasma jet. Under the action of hydrogen plasma in the reaction tube, a reduction reaction occurs. During the experiment, hydrogen, BCl 3 , argon gas flow maintained at 20m 3 / h, 10kg / h, 2m 3 / h. The discharge power is 200kW, the average temperature of the plasma jet is 4000-6000°C, the temperature of the mixed gas during the reduction reaction is 3000°C, and the running time is 60min. Check the yield of elemental boron. The boron powder obtained from the powder collector is weighed with a balance, and divided by the mass of boron in the raw materials consumed by the reaction, the yield of elemental boron is 60%.

Embodiment 5

[0049] In order to analyze the purity of the obtained boron powder, the product of Example 1 was sent to the Analysis and Testing Center of the National Institute of Nonferrous Metals for elemental analysis. The obtained results are shown in Table 2, and the B content is >98%. Among them, Mg, Al, Ca, Ti, Cr, Fe, Ni, Zn, Si and other elements are given by inductively coupled plasma mass spectrometry (ICP-MS); Cu elements are given by inductively coupled plasma atomic emission spectroscopy (ICP-AES) It is given that C elements are analyzed by high-frequency fusion infrared detection method, O and N elements are detected by pulse infrared thermal conductivity method, and B elements are obtained by subtraction method.

[0050] The element analysis result of table 2 boron powder

[0051]

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Abstract

The invention discloses a method and device for preparing high-purity nano boron powder by an argon-hydrogen hot plasma method. The method includes the following steps: taking argon and hydrogen as arc discharge gas to generate plasma jet at the temperature of thousands of degrees centigrade; introducing the jet into a reactor, quickly mixing with gaseous BCl3 and finishing reduction reaction to generate solid boron and gaseous hydrogen chloride; and carrying out gas-solid separation to obtain solid boron powder. The yield of produced boron powder is above 60%, the obtained product does not need to be treated further and the purity of the product is above 98%, and the average particle size of the product ranges from 30 nm to 150 nm. Compared with the traditional fused salt electrolysis process and hot spreading reduction method, the method has the features that the high-purity boron powder does not need to be subjected to aftertreatment or only needs to be subjected to simple aftertreatment, and technological conditions are simple. Compared with a low-air-pressure plasma process, the method has the features that production is expanded easily, and economy is good.

Description

technical field [0001] Embodiments of the present invention relate to the field of preparation of inorganic non-metallic materials, more specifically, embodiments of the present invention relate to a method and device for preparing high-purity nano-boron powder by argon-hydrogen thermal plasma method. Background technique [0002] Boron is used in metallurgy as an alloying agent for iron, manganese and other metals, as a deoxidizing additive for steel and copper, and also for heat treatment of forged iron to increase the high-temperature strength of alloy steel. Boron can also be used in atomic reactors, and rod and strip boron steels are widely used as control rods in atomic reactors. High-purity elemental boron has a high combustion value per unit mass (117kJ / g), and can be used to make solid fuel for high-speed aircraft. When used as solid fuel, the burning rate of high-purity boron powder (≥99%) with small particles (40-150nm) is higher than that of low-purity (95.5%-96...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/02B82Y40/00
CPCB82Y40/00C01B35/023C01P2004/62C01P2004/64C01P2006/80
Inventor 覃攀唐猷成
Owner SICHUAN YIJIE TECH CO LTD
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