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A kind of method for preparing crystalline boron powder

A crystalline, boron powder technology, applied in the field of metal materials, can solve the problems of high risk, large pollution, toxic precursors, etc., and achieve the effect of smooth reaction process and sufficient reaction

Active Publication Date: 2020-04-24
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing process of hydrogen reduction of boron halides has problems such as precursor toxicity and large pollution.
The Chinese patent No. 201110054793.1 discloses a method for preparing pure boron by reducing boron oxide with aluminum, but the reaction needs to be carried out in an autoclave, which is highly dangerous, and the prepared boron is in an amorphous form
The Chinese patent No. 200910117561.9 discloses a method for preparing boron powder by reducing boron oxide with magnesium. Magnesium in the raw material is an active metal with high risk, and the boron produced is also in an amorphous form.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Weigh the raw materials respectively by mass percentage, 91.5% of industrial pure copper, 5.8% of block boron oxide, 2.7% of industrial pure aluminum; the particle size of block boron oxide is about 1cm;

[0016] (2) Melt industrial pure copper in a high-frequency furnace, add industrial pure aluminum and massive boron oxide in sequence, and control the temperature at 1500-1600°C for 5 minutes of reaction, in which aluminum generates alumina powder by reducing boron oxide to float On the surface of the melt, the molten slag is cleaned and the melt is poured into a mold to obtain a Cu-2.7B alloy ingot;

[0017] (3) electrolyze the copper-boron alloy ingot prepared by step (2) as an anode, the cathode adopts high-purity graphite as an electrode, and the electrolytic solution selects copper sulfate solution;

[0018] (4) Cleaning the anode slime with a ferric chloride solution, taking out the cleaned anode slime and placing it in an incubator for drying, the temperatur...

Embodiment 2

[0022] (1) Weigh the raw materials respectively by mass percentage, industrial pure copper 84.3%, boron oxide 10.7%, industrial pure aluminum 5%; boron oxide particle size is about 2cm;

[0023] (2) Melt industrial pure copper in a high-frequency furnace, add industrial pure aluminum and massive boron oxide in turn, control the temperature at 1500-1600°C and react for 4 minutes, in which aluminum generates alumina powder by reducing boron oxide to float On the surface of the melt, the molten slag is cleaned and the melt is poured into a mold to obtain a Cu-5B copper-boron alloy ingot;

[0024] (3) electrolyze the copper-boron alloy ingot prepared by step (2) as an anode, the cathode adopts high-purity graphite as an electrode, and the electrolytic solution selects copper sulfate solution;

[0025] (4) Use ferric chloride solution to clean the anode slime, after cleaning the anode slime, place it in an incubator to remove moisture, and obtain boron powder;

[0026] (5) The cop...

Embodiment 3

[0029] (1) Weigh the raw materials respectively by mass percentage, 81% of industrial pure copper, 13% of block boron oxide, and 6% of industrial pure aluminum; the particle size of block boron oxide is about 3cm;

[0030] (2) Melt industrial pure copper in a high-frequency furnace, add industrial pure aluminum and massive boron oxide in sequence, and control the temperature at 1800-2000°C to react for 5 minutes, in which aluminum will generate alumina powder by reducing boron oxide to float On the surface of the melt, the molten slag is cleaned and the melt is poured into a mold to obtain a Cu-6B copper-boron alloy ingot;

[0031] (3) electrolyze the copper-boron alloy ingot prepared by step (2) as an anode, the cathode adopts high-purity graphite as an electrode, and the electrolytic solution selects copper sulfate solution;

[0032] (4) Cleaning the anode slime with a ferric chloride solution, taking out the cleaned anode slime and placing it in an incubator for drying, the...

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Abstract

The invention belongs to the field of metal materials, and relates to a method for preparing crystalline boron powder. The preparation method is characterized by comprising the following steps: firstly, respectively weighing the following raw materials in percentage by mass: 81.0%-91.5% of industrial pure copper, 5.8%-13.0% of boron oxide and 2.7%-6.0% of industrial pure aluminum; then putting industrial pure copper into a high-frequency furnace for melting, sequentially adding industrial pure aluminum and boron oxide, controlling the temperature to be 1500-2000 DEG C for reaction, cleaning slag, and pouring melt into a mold to obtain a copper-boron alloy cast ingot; taking the prepared copper-boron alloy cast ingot as an anode for electrolysis, and obtaining the boron powder; and washingthe copper obtained from the cathode by diluted hydrochloric acid to obtain an electrolytic pure copper. Compared with a traditional boron powder preparation method, the boron powder prepared throughthe method is in a crystalline state, and the purity of the boron powder is 95 wt% or above; industrial pure copper used in the preparation process can be recycled.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular to a method for preparing crystalline boron powder. Background technique [0002] Boron has the characteristics of high hardness, high melting point, low density and metalloid properties, and is widely used in high-strength composite materials, wear-resistant materials, heat-resistant materials, aluminum alloys and grain refinement of aluminum-based composite materials; The development of electron transport materials, superconducting materials and boron source field emission electron microscopy has broad prospects. The high volumetric combustion calorific value of boron element has attracted attention in the aerospace field. Compared with amorphous boron, crystalline boron has the advantages of low reactivity, not easily oxidized, not easily bonded, stable melting point, and uniform heat release. Adding it to liquid propellant fuel in the form of a combustion aid can greatly increase...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B35/02C25C1/12C22C1/02C22C9/00
CPCC01B35/023C22C1/02C22C9/00C25C1/12Y02P10/20
Inventor 武玉英袁文涛刘相法
Owner SHANDONG UNIV