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Preparation method of monoclinic system tungsten trioxide

A technology of tungsten trioxide and monoclinic crystal system, applied in chemical instruments and methods, tungsten oxide/tungsten hydroxide, metal/metal oxide/metal hydroxide catalyst, etc., can solve high production cost, complex process, Product performance research and other issues, to achieve the effect of low cost, easy access to raw materials, and simple process

Active Publication Date: 2017-02-22
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The raw materials of the above technologies are relatively expensive and costly, and are not suitable for industrial production; and no research has been conducted on product performance
[0004] The existing patents for the preparation of tungsten trioxide basically use analytically pure ammonium tungstate, sodium tungstate, ammonium paratungstate, etc. as raw materials. The process is complicated and the production cost is high, which is not conducive to industrial production.

Method used

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  • Preparation method of monoclinic system tungsten trioxide
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  • Preparation method of monoclinic system tungsten trioxide

Examples

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Embodiment 1

[0035] 12g of copper-tungsten alloy waste, first separate the copper and tungsten by the secondary nitric acid leaching method, and obtain 8.3g of tungsten slag, which contains less than 0.05% copper, and roast the tungsten slag at 400°C to obtain about 10g of yellow-green tungsten trioxide powder. The product is orthorhombic tungsten trioxide, such as figure 1 The XRD schematic diagram shown; add orthorhombic tungsten trioxide into ammonia water with a mass percentage of 25-28%, the solid-liquid ratio is 1:5, dissolve slowly for 18 hours, and the dissolution rate is about 90%, take the supernatant, evaporate Crystallize to obtain 9.71g of white crystal ammonium paratungstate; make ammonium paratungstate into 1mol / L aqueous solution, slowly add it to 3mol / L hydrochloric acid, stir for 1h to obtain yellow tungstic acid colloid, age at room temperature for 16h, filter and wash at 100℃ Dry it under the oven for 6 hours to obtain solid tungsten trioxide, and after grinding, 8.5g o...

Embodiment 2

[0037] 50g of copper-tungsten alloy waste, first separate the copper and tungsten by the secondary nitric acid leaching method to obtain 34.1g of tungsten slag, which contains less than 0.05% copper, and roast the tungsten slag at 600°C to obtain about 41g of yellow-green tungsten trioxide powder. The product is orthorhombic tungsten trioxide; add it to 25-28% ammonia water, the solid-liquid ratio is 1:10, dissolve slowly for 24 hours, and the dissolution rate is about 90%. Take the supernatant, evaporate and crystallize, and obtain 40.12 g white crystal ammonium paratungstate; make ammonium paratungstate into 2mol / L aqueous solution, slowly add it into 4mol / L hydrochloric acid, stir for 2h, and obtain yellow tungstic acid colloid, age at room temperature for 24h, filter and wash, then dry at 100°C for 6h , to obtain solid tungsten trioxide, and after grinding, 34.05 g of yellow tungsten trioxide powder was obtained. Through XRD analysis, the product is monoclinic tungsten tri...

Embodiment 3

[0039] 12g of copper-tungsten alloy waste, first separate the copper and tungsten by the secondary nitric acid leaching method to obtain 8.3g of tungsten slag, which contains less than 0.5% copper, and roast the tungsten slag at 400°C to obtain about 10g of yellow-green tungsten trioxide powder. The product is orthorhombic tungsten trioxide; add it to 50ml of 5mol / L sodium hydroxide solution, stir at 40°C for 5 hours, the dissolution rate of tungsten trioxide is about 90%, filter the supernatant, evaporate and crystallize 12.80g sodium tungstate crystals; add sodium tungstate crystals to 23ml of 1mol / L nitric acid solution, stir for 0.5h, and filter to obtain 9.68g yellow tungstic acid precipitate; add yellow tungstic acid to 50ml concentrated ammonia water (25-28% ) solution, after slowly dissolving for 12 hours, take the supernatant, distill ammonia at 60°C until the pH of the solution is about 7, and obtain ammonium tungstate solution; add this ammonium tungstate solution to...

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Abstract

The invention provides a method for preparing monoclinic system tungsten trioxide from copper-tungsten alloy waste as a raw material. The method comprises steps as follows: acid leaching, roasting, ammonification and acidolysis. The copper-tungsten alloy waste is taken as the raw material, a high-value product monoclinic system tungsten trioxide with a function of photocatalytic degradation of organic matter is prepared, cyclic utilization of the waste metal resource is realized, renewable energy sources (solar energy) can be utilized, a recycled product can be used for environmental pollution control, and national energy saving, environmental protection and resource recycling strategies are met. According to the preparation method, the raw material is easy to obtain, the cost is low, a process is simple, and the preparation method is suitable for industrial production.

Description

technical field [0001] The invention relates to a preparation method of tungsten trioxide, in particular to the preparation of tungsten trioxide by using copper-tungsten alloy waste. Background technique [0002] Metal tungsten is widely used in alloy manufacturing industry, shipbuilding industry, anti-corrosion coating, gas sensor, photocatalysis and display because of its good properties such as high hardness, high melting point, and no air corrosion at room temperature. During the process of tungsten product preparation and waste product elimination, a large amount of tungsten-containing secondary resources will be formed. Recovering tungsten from secondary resources will not only improve the grade of tungsten but also realize resource recycling. At present, the recycling of tungsten slag is mainly divided into three parts: (1) recovery of valuable metals; (2) use of tungsten slag as mineral raw material to produce wear-resistant materials; (3) production of tungsten slag...

Claims

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Application Information

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IPC IPC(8): C01G41/02B01J23/30
CPCY02P20/133C01G41/02B01J23/30C01P2002/30C01P2002/72
Inventor 尚通明沈尧胤魏成文郑成刘维桥何沁华
Owner JIANGSU UNIV OF TECH
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