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A kind of preparation method of high fluidity tungsten oxide

A high fluidity, tungsten oxide technology, applied in the direction of tungsten oxide/tungsten hydroxide, etc., can solve the problems affecting the production quality of tungsten powder, large fluctuations in tungsten oxide feed, high fluidity requirements of tungsten oxide, etc., to achieve high fluidity , Reduce production costs and reduce labor intensity

Inactive Publication Date: 2016-12-07
江钨世泰科钨品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This production mode avoids manual shoveling, but requires high fluidity of tungsten oxide
If the fluidity of tungsten oxide is poor, the feeding amount of tungsten oxide will fluctuate greatly, which will affect the production quality of tungsten powder

Method used

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  • A kind of preparation method of high fluidity tungsten oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1 like figure 1 Shown: Put the APT into the feeding bin, and feed it into the vacuum degree (0.5-0.8)×10 through the screw feeder at a speed of 220kg / h 4 In the rotary furnace of Pa, the protective gas nitrogen is introduced, and the temperature control is: 755°C for one zone, 755°C for the second zone, 650°C for the third zone, 635°C for the fourth zone, 635°C for the fifth zone, and 635°C for the sixth zone. After being calcined in a rotary furnace, it is cooled and sieved to obtain tungsten oxide with a fluidity of 26s / 50g.

Embodiment 2

[0021] Example 2 like figure 1 Shown: Put the APT into the feeding bin, and feed it into the vacuum degree (0.5-0.8)×10 through the screw feeder at a speed of 200kg / h 4 In the rotary furnace of Pa, the protective gas nitrogen is introduced, and the temperature is controlled as follows: 800°C for one zone, 800°C for the second zone, 650°C for the third zone, 640°C for the fourth zone, 620°C for the fifth zone, and 610°C for the sixth zone. After being calcined in a rotary furnace, it is cooled and sieved to obtain tungsten oxide with a fluidity of 26s / 50g.

Embodiment 3

[0022] Example 3 like figure 1 Shown: Put the APT into the feeding bin, and feed it into the vacuum degree (0.8-1.2)×10 through the screw feeder at a speed of 180kg / h 4 In the rotary furnace of Pa, the protective gas nitrogen is introduced, and the temperature control is: 750°C for one zone, 750°C for the second zone, 660°C for the third zone, 660°C for the fourth zone, 550°C for the fifth zone, and 550°C for the sixth zone. After being calcined in a rotary furnace, it is cooled and sieved to obtain tungsten oxide with a fluidity of 27s / 50g.

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Abstract

The present invention relates to a preparation method of high-fluidity tungsten oxide; ammonium tungsten compound is used as raw material, calcined in a negative-pressure closed calciner, the temperature of the furnace is controlled by gradient, and 2-6 temperature control zones are set during the calcining process. The temperature at the feed end is 700°C-800°C, the temperature at the discharge end is 500°C-700°C, the temperature difference between the front temperature zone and the rear temperature zone is 0°C-300°C temperature gradient; the vacuum degree in the calciner furnace is (0.1-1.5)×104Pa; Calcined in a negative-pressure closed calciner for 20-50 minutes, the charge is cooled by the cooling water jacket provided in the calciner, and then released from the furnace, and then sieved to obtain a tungsten oxide product with a fluidity of ≤30s / 50g. The tungsten oxide produced by the invention has high fluidity, which effectively solves the problem of uneven feeding of automatic feeding equipment and uneven weighing of automatic weighing equipment; improves the automation of tungsten powder production, reduces labor intensity, and reduces Production cost of tungsten powder.

Description

technical field [0001] The invention relates to a preparation method of tungsten oxide, in particular to a preparation method of high fluidity tungsten oxide. [0002] The term "ammonium tungsten compound" in this application is a general term for tungsten homo(hetero)polyacid ammonium salt compounds and their calcined products. [0003] In this application, the term APT is the abbreviation of "ammonium paratungstate". [0004] In this application, the term "tungsten oxide" refers to blue tungsten oxide or purple tungsten oxide. Background technique [0005] Tungsten is a refractory non-ferrous metal and an important strategic resource. It is widely used because of its excellent properties such as high melting point, high hardness, strong ductility, wear resistance and corrosion resistance. [0006] At present, the main equipment for producing tungsten powder is the pusher reduction furnace and the rotary reduction furnace. [0007] The feeding method of the pusher reduct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G41/02
Inventor 廖小丽谢金明余春荣朱亚模李继红
Owner 江钨世泰科钨品有限公司