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Method for preparing micron-nano tungsten carbide fiber by utilizing tungsten waste material

A tungsten carbide fiber, micro-nano technology, applied in fiber processing, fiber chemical characteristics, textiles and papermaking, etc., can solve the problems of high raw material requirements, difficult composition control, long process route, etc., and achieve high electrochemical activity and equipment requirements Low, the effect of reducing production costs

Active Publication Date: 2013-12-04
ZHEJIANG DEWEI CEMENTED CARBIDE MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is currently only in the stage of laboratory research, and there are also problems such as high requirements for raw materials and high cost.
[0006] In addition, new methods such as mechanical alloying method, spray thermal conversion method and plasma chemical vapor deposition method have also been reported for the preparation of tungsten carbide nanoscale materials, but most of these methods have requirements for equipment, harsh conditions, long process routes and relatively low composition. difficult to control

Method used

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  • Method for preparing micron-nano tungsten carbide fiber by utilizing tungsten waste material
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  • Method for preparing micron-nano tungsten carbide fiber by utilizing tungsten waste material

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Embodiment 1

[0035] A method for preparing micronano tungsten carbide fibers by utilizing tungsten waste materials, comprising the following steps:

[0036] (1) Tungsten waste is obtained from tungsten leaching slag. Its main component is determined to be 2.8% WO 3 , 23.6% Fe, 14% Mn and 2.4% CaO. Take 500g of the tungsten leaching slag and roast at 600°C for 8h. After the roasted material is cooled, it is pulverized and passed through a 60-mesh sieve. Then leaching with 20% (by mass fraction) ammonia water, the leaching temperature is 78° C., and the leaching time is 8 hours until the tungsten oxide therein is completely dissolved. Filter, take the filtrate to evaporate and concentrate, adjust the pH value to 6, lower the temperature to 10°C, and keep it warm for 4 hours to obtain ammonium paratungstate crystals. Take a sample for testing, and it is found that the content of tungsten trioxide contained therein is 85%, which is qualified. The ammonium paratungstate crystals were heate...

Embodiment 2

[0044] A method for preparing nanometer tungsten carbide fibers by utilizing tungsten waste materials, comprising the following steps:

[0045] (1) Tungsten waste is obtained from tungsten leaching slag. Its main component is determined to be 3.4% WO 3 , 20.6% Fe, 12% Mn and 2.1% CaO. Take 500g of the tungsten leached slag and place it at 630°C for 8 hours of roasting. After the roasted material is cooled, it is pulverized and passed through a 60-mesh sieve. Then leaching with 18.5% (by mass fraction) of ammonia water, the leaching temperature is 85° C., and the leaching time is 8 hours until the tungsten oxide therein is completely dissolved. Filter, take the filtrate to evaporate and concentrate, adjust the pH value to 6.3, lower the temperature to 13°C, and keep it warm for 4 hours to obtain ammonium paratungstate crystals. Take a sample for testing, and the content of tungsten trioxide contained in it is found to be 88%, which is qualified. The ammonium paratungstate ...

Embodiment 3

[0051] A method for preparing nanometer tungsten carbide fibers by utilizing tungsten waste materials, comprising the following steps:

[0052] (1) Tungsten waste is obtained from tungsten leaching slag. Its main component is determined to be 5.0% WO 3 , 21.4% Fe, 11% Mn and 2.0% CaO. Take 500g of the tungsten leached slag and place it at 650°C for 8 hours of roasting. After the roasted material is cooled, it is pulverized and passed through a 60-mesh sieve. Then, it is leached with 19% (by mass fraction) of ammonia water, the leaching temperature is 90° C., and the leaching time is 8 hours until the tungsten oxide therein is completely dissolved. Filter, take the filtrate to evaporate and concentrate, adjust the pH value to 6.5, lower the temperature to 15°C, and keep it warm for 4 hours to obtain ammonium paratungstate crystals. Take a sample for testing, and it is found that the content of tungsten trioxide contained therein is 90%, which is qualified. The ammonium par...

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Abstract

The invention provides a method for preparing a micron-nano tungsten carbide fiber by utilizing a tungsten waste material, which comprises the following steps: (1), taking the tungsten waste material to make an ammonium metatungstate aqueous solution; (2), making a micron-nano polyacrylonitrile fibril by adopting an electrostatic spinning method; (3), carrying out preoxidation on the micron-nano polyacrylonitrile fibril; (4), taking the ammonium metatungstate aqueous solution made in the step (1) to soak the micron-nano polyacrylonitrile fibril subjected to the preoxidation in the step (3) to make an ammonium metatungstate / micron-nano polyacrylonitrile fibril primary composite fiber; and (5), placing the ammonium metatungstate / micron-nano polyacrylonitrile fibril primary composite fiber in a reducing furnace filled with reducing gas for carbonizing to make the micron-nano tungsten carbide fiber. A product, namely the tungsten carbide fiber, which is prepared through the method has a diameter of a micron-nano scale and a big specific surface area, and can be used for the fields of heterogeneous catalysis and electrocatalysis. In addition, according to the method for preparing the micron-nano tungsten carbide fiber by utilizing the tungsten waste material, the tungsten waste material is utilized as a raw material; the production cost is greatly decreased; and the cyclic utilization of the tungsten waste material is also promoted while the better economic benefit is obtained.

Description

technical field [0001] The invention relates to the treatment of metal waste materials, in particular to a method for preparing micronano tungsten carbide fibers by using tungsten waste materials. Background technique [0002] Tungsten carbide (WC) is a black hexagonal crystal with a metallic luster and a hardness similar to that of diamond. It is an important cemented carbide material. Since Levy RB first pointed out that tungsten carbide has a platinum (Pt) catalytic effect in 1973, researchers began to try to use tungsten carbide instead of noble metal catalysts in the field of heterogeneous catalysis and electrocatalysis. [0003] The synthesis of traditional tungsten carbide generally adopts a two-step method of reduction carbonization. Tungsten powder is prepared from a tungsten-containing precursor, and then tungsten powder and carbon black are mixed and carbonized at a high temperature of 1400-1600 ° C to finally obtain tungsten carbide powder. The Chinese patent wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/10D01D5/00
Inventor 许开华
Owner ZHEJIANG DEWEI CEMENTED CARBIDE MFG CO LTD