LATHE MACHINE CUTTING TOOLS,CARBIDE DRILLING INSERTS,CARBIDE INSERTS

LATHE MACHINE CUTTING TOOLS,CARBIDE DRILLING INSERTS,CARBIDE INSERTS,We offer round, square, radius, and diamond shaped carbide inserts and cutters.

2023年02月

Yellow Tungsten Oxide Film Applied for Package Security Label

It has been reported that yellow tungsten oxide film (It is more often known as tungsten trioxide film or WO3 film.) may be used as the basic material for package security label. This is mainly a package security label made by combining the characteristics of WO3 film under ultraviolet (sunlight) radiation with other technologies.

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When a consumer places such a label under sunlight, the label will change, that is, it will turn blue to verify the authenticity of the product. This is because yellow tungsten oxide film is an excellent wide band gap metal oxide semiconductor, which has special color-changing characteristics, such as electrochromic characteristics, photochromic characteristics, and gasochromic characteristics. Wherein, this package security label uses the photochromic properties of WO3. As the most studied transition material oxide for photochromism, WO3 has received much attention. It means that WO3 is popular.

Tungsten Carbide Circular Blade

Tungsten carbide circular blade has characteristics of super precision, better physical appearance, good cutting performance, clean and neat cut, no burr, wear resistance and long working life. It is mainly applied in metalworking, steel mills, plastic processing and other industries.

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Your benefits of ChinaTungsten Online tungsten carbide circular blades include:

1. Improved durability and wear-life, up to 600% better than standard steels;

2. Greater productivity and less down time due to fewer blade changes;

3. Cleaner and more precise cuts due to reduced friction;

4. Reduction in start-up and end of line waste;

5. Better overall cutting performance in high heat and high speed cutting environments.

ChinaTungsten Online provides a line of industry standard tungsten carbide blades, cutters and drill bits. We also provide a broad choice of custom made carbide blades, cutters and drill bits to meet your special needs, in accordance with your drawings.

Tungsten Carbide Indenter Wear Part

As a typical representative of super hard materials, tungsten carbide is called "industrial teeth", and its excellent wear resistance is a high-quality embodiment of long-term use.

Tungsten carbide indenter is pressed and sintered into a semi-processed blank of solid carbide material. The internal thread is directly formed and processed during the semi-processed production of the blank. Subsequent surface precision grinding is performed by a precision machine tool, and the precise size control processing makes it become perfect finished wear-resistant indenter wear part. The flatness is required to be in the range of 0.008, and the verticality is required to be 0.02. The hardness of the cemented Deep Hole Drilling Inserts carbide indenter is between HRA92.5-93, and the super wear resistance is the basic requirement.

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According to the production process of special cemented carbide products, the most advanced vacuum low pressure sintering process is made by sintering at 1300 degrees high temperature. The product has good metallurgical structure compactness, no sand holes and no bubbles. When the blank is sintered, the internal thread is half finishing, forming and sintering is convenient for the accuracy of subsequent finishing thread size. This is a powerful technical embodiment for the sintering of cemented carbide blanks. As an industrial tooth, cemented carbide has become the primary choice for high-quality wear-resistant parts due to its high hardness, high strength and high density.

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Chinatungsten Online produces customized tungsten carbide indenters for hard alloy wear-resistant parts of various sizes. The product drawing is as follows:
Use for deep hole drilling high efficiency indexable drilling inserts800-06T308M-C-G

“Three Wastes” Pollution in Tungsten Disulfide Preparation

“Three wastes” pollution produced in the preparation of tungsten disulfide, harming the human health and environment. They are tungsten-containing residue, acid-containing liquor and hydrogen sulfide together with other gases. They deserve our attention.

Waste liquor, waste gases and solid wastes---collectively called “three wastes”---are three main types of industrial pollution. In tungsten disulfide process, tungsten-containing residue, acid-containing liquor, together with hydrogen sulfide and other gases constitute “three wastes” pollution.

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Tungsten disulfide is often prepared from ammonium tetrathiotungstate. The preparation process is as follows:

raw materials (solution containing tungsten or artificial calcium tungstate) →ingredients →acid dissolution →ammonia neutralization →vulcanization →reduction →crushing →compression →tungsten disulfide products.

The raw material is firstly dissolved with HCl hydrochloric acid to form tungstic acid (H2WO4). Then tungstic acid is mixed with ammonia water to form ammonium tungstate [(NH4)2WO4]. Next, ammonium tungstate is added to hydrogen sulfide (H2S) to form tetrathiotungstate [(NH4)2WS4]. Finally, tungsten disulfide is prepared by the reduction reaction of tetrathiotungstate by hydrogen in high temperature reflector.

With the example of a plant, the following is “three wastes” pollution in tungsten disulfide preparation.

1. Solid wastestungsten-containing residue

The plant’s annual output of ammonia dissolved filter residue was 8.58 t, and 0.79 t of WO3; the annual concentrated filter residue was 14.28 t, about 9.28 t of WO3. The waste residue contains a certain amount of versatile WO3. The tungsten-containing Tungsten Carbide Insert residue are versatile and recyclable material. If it is discarded, it will be a waste of resource.

 

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2.Waste liquor: acid-containing liquor

The plant’s annual output of acid-soluble filtrate was 450 m³, containing 500 g/m³ WO3 and 2.5 mol/L HCl. And tungsten acid solution annual output was 1350m³, containing a small amount of calcium ions. If it is poured into the clean water, the acid-containing liquor will cause the pollution.

3.Waste gases: hydrogen sulfide and other gases

Harmful gas H2S, HCl, NH3 and other gases were discharged in the preparation of tungsten disulfide. If released into the atmosphere, the exotic H2S will do harm to the human health and environment.

With the continuous development economy, people should attach importance to “three wastes” pollution produced in tungsten disulfide preparation, so as to ensure the production safety and environmental health.

How to Extract Cobalt and Tungsten from Waste Cemented Carbide

With the rapid development of economy, the demand for tungsten and cobalt in machinery manufacturing, geology, mining, construction, electronics and chemical industries is increasing. As rare metal elements, tungsten and cobalt are also the main raw materials of cemented carbide. Therefore, it is very meaningful to recycle tungsten and cobalt from scrap cemented carbide.

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At present, the process of extracting cobalt and tungsten from scrap cemented carbides includes separating cobalt and tungsten from the recycled cemented carbides by classifying, crushing, ball milling and electrolysis powder, and then by chemical extraction. Due to the high hardness of waste cemented carbide, powder can be obtained directly by crushing and ball milling. Its efficiency is low. Generally, a production cycle is at least 20 days. In addition, the electrolysis of waste cemented carbide still has potential dangers of high energy consumption and environmental pollution. In view of this, some scholars have reformed the recovery process of cemented carbide to achieve a better recovery scheme of tungsten and cobalt, which includes the following steps:

First step, scorch
The scrap cemented carbide was scorched at 1700-1750 ℃.

Second step, break up
The cemented carbide blocks after burning are put into ball mill for ball milling and crushing.

Third step, screening separation
The cemented carbide crushed by ball mill is screened and separated, and the separated large cemented carbide is returned to ball mill for ball milling and crushing.

Fourth step: extraction of cobalt and tungsten
The cemented carbide powder obtained by crushing the ball mill is reacted with a sodium hydroxide solution, and the obtained sodium tungstate solution is added with sulfuric acid, and ammonia water is extracted and stripped to form an ammonium tungstate solution, which is heated, evaporated, crystallized, dried, and again. The simmering is added with hydrogen to reduce to metal tungsten powder. Finally, the solid matter is extracted with cobalt sulfate and ammonium oxalate to extract cobalt powder and nickel powder, and metal ruthenium and metal ruthenium.

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