Blue tungsten oxide is the product of the interaction between reducing agent and tungsten compound, usually called blue tungsten. The composition of blue tungsten is very complex, and there are also intermediate oxides such as WO2 and W4. If the composition of blue tungsten is calculated as WO, the tungsten content is 82.13%, while the tungsten content in WO is 79.30%. That is to say, the tungsten content in blue tungsten oxide is greater than tungsten trioxide. According to the blue tungsten oxide product standard requirements, its purity is 99.95%, and the tungsten content should reach 80%~80.8%.

The preparation methods of blue tungsten oxide include: APT sealed calcination method, APT hydrogen mild reduction method, intrinsic reduction method, ion exchange method, etc. Among them, the ion exchange method is the most common and economical preparation method.

Blue tungsten oxide can be used to produce tungsten powder, and then produce tungsten products such as cemented carbide, pure tungsten and tungsten alloy products. In recent years, blue tungsten oxide has been used in emerging industries such as lubricants, catalysts, thin film substrates for semiconductor equipment, radiation protection products, electronic components, raw materials for glass thermal insulation coating dispersions, etc.

Ammonium metatungstate is an important intermediate compound in the tungsten wet smelting process. It appears as a white slightly yellow crystalline powder. Soluble in water, at 25℃, the solubility is greater than 300grams in 100ml water.

The main preparation methods are: acid neutralization method, thermal separation method, electrodialysis method, ion exchange method, solvent extraction method and preparation method using ammonium paratungstate as raw material. Among them, the acid neutralization method is the main process, which can use organic acids (formic acid, acetic acid, citric acid, lactic acid, etc.) or inorganic acids (tungstic acid, nitric acid, etc.). Organic acids are mild in acidity and easy to operate, but they are more expensive and affecting costs is a major drawback. Among inorganic acids, nitric acid is easy to obtain and cheap. The nitric acid neutralization method for preparing ammonium metatungstate has simple process and equipment, which has attracted people's attention and has been widely used in industrial production.

The purity of ammonium metatungstate provided by Chinatungsten Online is generally above 90.00% or 91.00%. 

Tungsten wire mesh is woven by tungsten wire with purity over 99.95%, and is also called tungsten shielding wire mesh, filter tungsten wire mesh, and high temperature tungsten wire mesh.

1. Laser Particle Size Analyzer
Laser particle size analyzer is used for testing the particle size distribution for tungsten oxide.
Size range: 0.1~1000 micron
Acuracy: better than 1%
Repeatability: better than 1%
Voltage: 220+/-2V

1. Production methods of ammonium paratungstate include evaporation method, crystallization method, freeze-drying method and solvent extraction method.

Milling processing is divided into down milling and up milling. Down milling is a milling method in which the rotation direction of the contact part of the milling cutter and the workpiece is the same as the cutting feed direction.

There are four main production technologies of preparing tungsten copper: mixed-press sintering method, activation sintering method, infiltration method, and nano/ultrafine mixed powder sintering method.

1.Brief introduction

Barium tungstate is white powder, has micro toxicity. Relative density is 5.04. It can slightly dissolve in water, completely dissolved in oxalate water solution, decompose in acid and is stable in the air.

1.Brief introduction

Block infrared rays at 950nm (up to 95% at 1400nm), mainly used for various plastic and glass films.

There are four preparation methods of tungsten alloy balls, namely, compression molding, disc pelletizing, squeeze-cut rotation method and injection molding.