Method for purifying amorphous rough boron powder through pressurizing and leaching

A pressure leaching, amorphous technology, applied in boron/boride and other directions, can solve problems such as the development of crude boron powder purification research work, and achieve the effects of novel technology, simple purification process and high added value

Inactive Publication Date: 2012-06-13
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, there is little research on the purification of coarse boron powder produced by magnesia thermal reduction.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Amorphous coarse boron powder with a purity of 90% prepared by the spreading magnesia thermal reduction method;

[0018] (2) Prepare dilute hydrochloric acid with a concentration of 0.2mol / L;

[0019] (3) Add the dilute hydrochloric acid in step (2) to the amorphous coarse boron powder in step (1) according to the liquid-solid mass ratio of 5:1, heat up to 220°C under stirring, and then pressurize to 1.5MPa, then leaching Reaction 2.5h;

[0020] (4) After the reaction in step (2), cool naturally to room temperature, filter the mixture, wash the filter residue with water for 4 times, dry at 120°C and vacuum degree of 20Pa for 2 hours, and then sieve to obtain Amorphous boron powder with a purity of 97.7%. Among them, the contents of impurities such as Mg, O, Si, and Fe are 0.7%, 0.13%, 0.8%, and 0.25%, respectively.

Embodiment 2

[0022] (1) Amorphous coarse boron powder with a purity of 90% prepared by the spreading magnesia thermal reduction method;

[0023] (2) Prepare dilute hydrochloric acid with a concentration of 0.05mol / L;

[0024] (3) Add the dilute hydrochloric acid in step (2) to the amorphous coarse boron powder in step (1) according to the liquid-solid mass ratio of 4:1, heat up to 120°C under stirring, and then pressurize to 1.0MPa, then leaching Reaction 3h;

[0025] (4) After the reaction in step (2), cool naturally to room temperature, filter the mixture, wash the filter residue with water for 3 times, dry at 100°C and vacuum degree of 18Pa for 3 hours, and then sieve to obtain Amorphous boron powder with a purity of 97.4%. Among them, the contents of impurities such as Mg, O, Si, and Fe are 0.9%, 0.2%, 1.0%, and 0.25%, respectively.

Embodiment 3

[0027] (1) Amorphous coarse boron powder with a purity of 90% prepared by the spreading magnesia thermal reduction method;

[0028] (2) Prepare dilute hydrochloric acid with a concentration of 0.5mol / L;

[0029] (3) Add the dilute hydrochloric acid in step (2) to the amorphous coarse boron powder in step (1) according to the liquid-solid mass ratio of 6:1, heat up to 180°C under stirring, and then pressurize to 2.0MPa, then leaching Reaction 2h;

[0030] (4) After the reaction in step (2), cool naturally to room temperature, filter the mixture, wash the filter residue with distilled water for 5 times, dry it at 150°C and a vacuum of 10Pa for 1 hour, and then sieve it. Amorphous boron powder with a purity of more than 98.1% is obtained. Among them, the contents of impurities such as Mg, O, Si, and Fe are 0.64%, 0.13%, 0.78%, and 0.25%, respectively.

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Abstract

The invention provides a method for purifying amorphous rough boron powder through pressurizing and leaching. The method comprises the following steps of: adding diluted hydrochloric acid of a certain proportion to the amorphous rough boron powder, heating and pressurizing during mixing, and carrying out leaching reaction; and naturally cooling down to room temperature to obtain a mixture, filtering the mixture, cleaning filter residue by water, drying and sieving to obtain amorphous boron powder with purity of more than 97%, wherein the contents of impurities, such as Mg, O, Si, Fe and the like are respectively below 0.9%, 0.2%, 1.0% and 0.3%. According to the method for purifying the amorphous rough boron powder through pressurizing and leaching, disclosed by the invention, the purification of rough boron is carried out by a hydrometallurgy pressurizing leaching method, thus the purification process is simple, the cost is low, the additional value is high and the purity of boron power can be over 97%. The method for purifying the amorphous rough boron powder through pressurizing and leaching, disclosed by the invention, has the advantages of novel technique, innovativeness and high additional value, and can solve a problem that the purity of the amorphous boron powder prepared by the current thermal magnesium reduction method is too low.

Description

technical field [0001] The invention relates to a method of pressure leaching and purification, in particular to a method of pressure leaching and purification using amorphous coarse boron powder prepared by a self-propagating magnesia thermal reduction method as a raw material, and belongs to the technical field of boron fine chemical industry. Background technique [0002] Amorphous boron powder is an important boron fine chemical product. Due to the high surface activity of boron, it is widely used as a modified component in the metallurgical industry. In solid rocket composite propellants, light metal fuels mainly include Mg, Al , Be, B, among which B has the highest volumetric calorific value, and the ignition temperature of amorphous boron is greatly reduced due to its irregular shape and large specific surface area. At the same time, amorphous boron powder is still used to prepare TiB 2 、LaB 6 , B 4 Important raw materials for borides such as C and BN. In recent ye...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/02
Inventor 伍继君马文会杨斌刘大春谢克强魏奎先周阳徐宝强王飞戴永年刘永成
Owner KUNMING UNIV OF SCI & TECH
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