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.

The low-temperature ductility of the tungsten wire is the main factor affecting the winding performance. The main influencing factors are the purity of raw materials, additives and the surface condition of the wire.