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Method for preparing high-purity vanadium powder

A technology of high-purity vanadium powder and vanadium blocks, which is applied in the field of preparation of high-purity vanadium powder, can solve problems such as difficulties in the preparation of vanadium powder, and achieve the effect of easy control of process parameters and convenient operation

Active Publication Date: 2012-11-07
SICHUAN INST OF MATERIALS & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is more difficult to prepare high-purity, ultra-fine vanadium powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A preparation method of high-purity vanadium powder includes the following steps:

[0019] a. Surface activation of the vanadium block: use saturated NaOH lye, distilled water and ethanol to activate the surface of the vanadium block in order, or use acetone instead of ethanol, and then put it in a closed container;

[0020] b. Vanadium block hydrogenation: Put the above-mentioned closed container with vanadium block into the hydrogenation hydrogen absorption system, and the vacuum degree is better than 1×10 -3 Pa. Dry and degas under the condition of 500℃. Due to the high hydrogen absorption temperature of vanadium, the degassed vanadium block is hydrogenated at 200℃ to obtain high-purity vanadium hydride particles. In order to reduce the high-purity hydrogen The purity of high-purity hydrogen used in hydrogenation is greater than 99.999%;

[0021] c. Vanadium hydride refinement: Put the high-purity vanadium hydride particles prepared by the above reaction into a planetary ba...

Embodiment 2

[0025] A preparation method of high-purity vanadium powder includes the following steps:

[0026] a. Surface activation of the vanadium block: use saturated NaOH lye, distilled water and ethanol to activate the surface of the vanadium block in order, or use acetone instead of ethanol, and then put it in a closed container;

[0027] b. Vanadium block hydrogenation: Put the above-mentioned closed container with vanadium block into the hydrogenation hydrogen absorption system, the vacuum degree is better than 1×10 -3 Pa. Dry and degas under the condition of 600℃. Due to the high hydrogen absorption temperature of vanadium, the degassed vanadium block is hydrogenated at 300℃ to obtain high-purity vanadium hydride particles. In order to reduce the high-purity hydrogen The purity of high-purity hydrogen used in hydrogenation is greater than 99.999%;

[0028] c. Vanadium hydride refinement: Put the high-purity vanadium hydride particles prepared by the above reaction into a planetary ball m...

Embodiment 3

[0032] A preparation method of high-purity vanadium powder includes the following steps:

[0033] a. Surface activation of the vanadium block: use saturated NaOH lye, distilled water and ethanol to activate the surface of the vanadium block in order, or use acetone instead of ethanol, and then put it in a closed container;

[0034] b. Vanadium block hydrogenation: Put the above-mentioned closed container with vanadium block into the hydrogenation hydrogen absorption system, the vacuum degree is better than 1×10 -3 Pa. Dry and degas under the condition of 650℃. Due to the high hydrogen absorption temperature of vanadium, the degassed vanadium block is hydrogenated at 350℃ to obtain high-purity vanadium hydride particles. In order to reduce the high-purity hydrogen The purity of the high purity hydrogen used in hydrogenation is greater than 99.999%;

[0035] c. Refining vanadium hydride: Put the high-purity vanadium hydride particles prepared by the above reaction into a planetary ball...

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Abstract

The invention discloses a method for preparing high-purity vanadium powder. The method aims to solve the problem that contents of impurities, particularly contents of O and N, in vanadium powder are high, and requirements of powder metallurgy on purity of raw materials and the like are met. The method includes activating surfaces of a vanadium block by saturated NaO alkali liquor, distilled water and ethanol or acetone sequentially, feeding the vanadium block in a closed container, placing the closed container with the vanadium block in a hydrogenation hydrogen absorbing system, drying and degassing the vanadium block and hydrogenating the degassed vanadium block at the temperature ranging from 200 DEG C to 500 DEG C to obtain high-purity vanadium hydride grains; placing the high-purity vanadium hydride grains in a planetary ball mill for dry grinding; and feeding vanadium hydride powder obtained in the previous step in the closed container for dehydrogenization at a high temperature. The granularity of the submicron vanadium powder prepared by the method can be smaller than 30 micrometers, oxygen content can be controlled to be within 600ppm, nitrogen content is lower than 250ppm, and the problem that the high-purity vanadium powder is prepared difficultly is effectively solved.

Description

technical field [0001] The invention relates to a preparation method of high-purity vanadium powder. Background technique [0002] With the development and progress of powder metallurgy technology, the application field of its main raw material, metal powder, has been continuously expanded, and the market demand has increased sharply, and it has shown a trend of developing towards high purity and ultrafine. At present, the relatively mature metal powder preparation methods mainly include mechanical method and physical method, and both methods have certain shortcomings and deficiencies. [0003] The mechanical method is a processing method that breaks bulk metal into powder of required particle size by means of mechanical force. According to the different mechanical forces, it can be divided into mechanical impact pulverization method, jet mill pulverization method, ball mill method and ultrasonic pulverization method. The methods commonly used at present are ball milling a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04
Inventor 杨维才董鲜峰曾大鹏林波王锡胜李启寿赵宗峰颜宏伟沈军蔡永军李耀强孙黎王文贤
Owner SICHUAN INST OF MATERIALS & TECH
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