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Low-Fisher tungsten oxide and preparation method thereof

A technology of tungsten oxide and Fisherman's technology, which is applied in the direction of tungsten oxide/tungsten hydroxide, etc., can solve problems such as limitation and crystal form damage, and achieve the effect of reducing Fisherman's particle size, avoiding crystal form damage, and good economic value

Active Publication Date: 2018-11-23
XIAMEN TUNGSTEN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem that the existing low-Fischer tungsten oxide preparation method is limited by the particle size of the APT raw material, and the crystal form will be destroyed when the tungsten oxide product is used as the raw material, and to provide a low-Fischer tungsten oxide and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Ammonium paratungstate wet material is used as the raw material, the Fischer particle size is about 35-45μm, the medium-temperature calcination temperature is 270°C, the feed rate is 100kg / h, and the calcination time is 40min. / h, the calcination time is 40min, and the Fischer particle size of the obtained yellow tungsten oxide YTO product is 12.7μm.

Embodiment 2

[0040] Ammonium paratungstate dry material is used as the raw material, the Fischer particle size is about 35-45μm, the medium-temperature calcination temperature is 360°C, the feed rate is 100kg / h, and the calcination time is 40min. / h, the calcination time is 40min, and the Fischer particle size of the obtained blue tungsten oxide BTO product is 9.6μm.

Embodiment 3

[0042]Ammonium paratungstate wet material is used as the raw material, the Fischer particle size is about 38-43μm, the medium-temperature calcination temperature is 330°C, the feed rate is 100kg / h, and the calcination time is 40min. / h, the calcination time is 40min, and the Fischer particle size of the obtained yellow tungsten oxide YTO product is 11.4μm.

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PUM

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Abstract

The invention relates to low-Fisher tungsten oxide and a preparation method thereof. The preparation method comprises the following steps of: calcining ammonium paratungstate at a first temperature toobtain an intermediate product; calcining the intermediate product obtained in the step (1) at a second temperature higher than the first temperature by at least 300 DEG C to obtain the low-Fisher tungsten oxide. The method is concise and efficient, is wide in raw-material applicability and good in production reproducibility and plays a positive role in subsequent production of products such as low-particle-size tungsten powder and tungsten carbide powder and the like.

Description

technical field [0001] The invention relates to a tungsten product processing technology, in particular to a low Fischer tungsten oxide and a preparation method thereof. Background technique [0002] Tungsten is a strategic metal that is widely used in steel, machining, electronics, aerospace and defense industries, known as "industrial teeth". China is a big country with tungsten resources, and its reserves rank first in the world. After decades of development, my country's tungsten smelting technology has made great progress. [0003] Tungsten oxide is an important tungsten intermediate product, which is mainly used in the production of metal tungsten powder, tungsten carbide powder and tungsten powder, and then used in the production of metal tungsten products and alloy products. In the contemporary industrial field, the most widely used are cemented carbide products of various grades and uses based on tungsten. Due to the genetic characteristics of tungsten products, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/02
CPCC01G41/02C01P2004/61
Inventor 陈杰曾微微王海军
Owner XIAMEN TUNGSTEN