TWI703232B - Tungsten product vapor deposition recovery method - Google Patents

Abstract

A method for vapor deposition recovery of tungsten products, which mainly recycles waste tungsten products through vapor deposition. The steps mainly include: sandblasting the surface, polishing and grinding, washing with deionized water, and chemical Vapor deposition and precision processing and molding. After the waste tungsten products are sandblasted, polished and washed with ion water, the surface of the waste tungsten products will be repaired through vapor deposition, and finally they can be reused after precision processing. Tungsten products.

Description

Tungsten product vapor deposition recovery method

The invention relates to a method for recovering tungsten products by vapor deposition, especially a method for recovering waste tungsten products through vapor deposition.

With the rapid development of technology and industry, the demand for many precious metals is expanding day by day. However, many precious metals have fewer resources to collect. Therefore, governments around the world have endless ways to study how to recover precious metals. The efficiency has been increased to the maximum. Among a variety of precious metals, especially the "tungsten" metal, the demand for use has increased rapidly in recent years. The more common recycling methods currently used include: mechanical crushing, saltpeter, zinc melting, electrolysis Method, leaching method, reduction method, roasting ammonia leaching method, etc. However, the above-mentioned recovery methods cause considerable environmental pollution during the process, and the highest recovery rate is only between 10% and 30%. As a result, the recycling of finished products is quite expensive. Therefore, how to improve the above-mentioned shortcomings is the technical difficulty that the creators of this case want to solve.

The main purpose of the present invention is to recycle waste tungsten products through vapor deposition. The steps include: sandblasting, polishing and grinding, washing with deionized water, and chemical vapor deposition. As well as precision processing and molding, after the waste tungsten products are sandblasted, polished and washed with ionized water, the surface of the waste tungsten products will be repaired through vapor deposition, and finally after precision processing, they can become reusable tungsten products.

S1‧‧‧The surface is sandblasted

S2‧‧‧For polishing and grinding

S3‧‧‧Rinse with deionized water

S4‧‧‧Chemical vapor deposition

S5‧‧‧Precision processing and forming

Figure 1 is a flowchart of the present invention.

Figure 2 is a schematic diagram of the surface of the sprayed waste tungsten product of the present invention.

Figure 3 is a schematic diagram of the vapor deposition principle of the present invention.

Please refer to Figure 1, Figure 2 and Figure 3 at the same time, which are the flow chart of the present invention, the schematic diagram of the surface of the sprayed waste tungsten product and the schematic diagram of the vapor deposition principle. It can be clearly seen from the figure that the present invention is Recycling and recycling of scrap tungsten products through vapor deposition mainly includes: (1) sandblasting the surface; (2) polishing and grinding; (3) washing with deionized water; (4) chemical Vapor deposition; (5) Precision processing and molding; Among them, chemical vapor deposition is carried out through the gas of tungsten hexafluoride (WF6) and hydrogen (3H2) to repair the surface of waste tungsten products; among them, chemical vapor deposition The deposition is carried out under environmental conditions below 600°C; among them, the waste tungsten products are placed in the mold and carried out in the reaction chamber during chemical vapor deposition; before chemical vapor deposition, it is necessary to The surface of the discarded tungsten products is sandblasted and polished, and then the surface is cleaned with deionized water. The discarded tungsten products after the above procedures are placed in a mold and chemical vapor deposition is performed in the reaction chamber. Finally, And through precision processing and molding, to obtain reusable tungsten products; as mentioned above, chemical vapor deposition is mainly carried out through the gas of tungsten hexafluoride (WF6) and hydrogen (3H2), so that the surface of scrap tungsten products The chemical reaction produces tungsten atoms (W) to accumulate and grow, so that tungsten atoms (W) slowly accumulate to repair the surface of waste tungsten products. The reason why hydrogen (3H2) is used is mainly that hydrogen (3H2) can make tungsten hexafluoride ( WF6) reduces tungsten atoms (W) with high purity and high density; the reason why it is necessary to perform sandblasting and polishing before chemical vapor deposition, and then wash the surface with deionized water, is because the waste tungsten products When using, the surface will be contaminated with dust, foreign matter or unknown liquid. In order to avoid tungsten atoms (W) from being mixed on the surface and causing unevenness on the surface, the above-mentioned treatment procedures must be carried out first; and As shown in Figure 3, when hydrogen (3H2) reduces tungsten hexafluoride (WF6) to high-purity and high-density tungsten atoms (W), they will accumulate on the surface of waste tungsten products, and at the same time during the reaction The generated hydrofluoric acid (6HF) will volatilize; and the chemical formula generated during chemical vapor deposition is as follows: WF ₆ (tungsten hexafluoride) + 3H2 (hydrogen) → W (tungsten) + 6HF( Hydrofluoric acid); as shown in the above chemical formula, when tungsten hexafluoride (WF6) encounters hydrogen (3H2), it will produce high-purity and high-density tungsten atoms (W) and hydrofluoric acid (6HF) ), and when tungsten atoms (W) accumulate on the surface of waste tungsten products, the hydrofluoric acid (6HF) will volatilize at the same time; in summary, compared with the conventional mechanical crushing method, saltpeter method, zinc The melting method, electrolysis method, leaching method, reduction method and roasting ammonia leaching method have the disadvantages of environmental pollution and low recovery rate. The present invention uses chemical vapor deposition to repair the surface of waste tungsten products, and finally , After precision processing and forming, it can become a reusable tungsten product. By chemical vapor deposition, in addition to obtaining high-purity and high-density tungsten atoms (W), the final volatilized hydrofluoric acid (6HF) is more environmentally friendly than the waste generated by the above-mentioned conventional methods Pollution is a concern, and because chemical vapor deposition is performed in a mold and a reaction chamber, it is easier to concentrate and recover the volatilized hydrofluoric acid (6HF).

The above-mentioned embodiments are used to illustrate one of the preferred and feasible embodiments of the present invention, and are not used to limit the scope of the present invention. Anyone who is familiar with the art can do a little bit without departing from the spirit and scope of the present invention. Modifications and modifications, therefore, the scope of protection of the present invention shall be subject to the scope of the attached patent application.

S1‧‧‧The surface is sandblasted

S2‧‧‧For polishing and grinding

S3‧‧‧Rinse with deionized water

S4‧‧‧Chemical vapor deposition

S5‧‧‧Precision processing and forming

Claims (1)

A method of vapor deposition recovery of tungsten products is to recover waste tungsten products through chemical vapor deposition. The main steps include: (1) sandblasting the surface; (2) polishing and grinding; (3) Ionized water washing; (4) Chemical vapor deposition; (5) Precision machining and molding; Among them, chemical vapor deposition is carried out through the gas of tungsten hexafluoride (WF6) and hydrogen (H2) to repair the scrap The surface of tungsten products and chemical vapor deposition are carried out under environmental conditions below 600°C. During chemical vapor deposition, waste tungsten products are placed in a mold and carried out in a reaction chamber. The chemical reaction formula for deposition is: WF ₆ (tungsten hexafluoride) + 3H2 (hydrogen) → W (tungsten) + 6HF (hydrofluoric acid).

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