Tungsten Oxide

Ammonium metatungstate (AMT) is an important compound product in the process of tungsten smelting. It is widely used. The preparation methods of ammonium acid are heat degradation and ion exchange, extraction, electrodialysis and neutralization. The neutralization method called ammonium tungstate acid, ammonium paratungstate production is one of the commonly used method, but this method can also be used for the preparation of ammonium metatungstate, it is used in acid solution and the crystallization of APT, by controlling the pH value of 3-4, heating, stirring and other means to strengthen the ammonium tungstate solution is gradually converted into ammonium metatungstate solution then, the precipitation of AMT crystals. Some scholars use ammonium paratungstate as raw material, adopt continuous solution conversion method,compare the effect of two kinds of acidizing agents, nitric acid and cationic resin on the basis of experiment. After that, nitric acid is selecte...

Ammonium paratungstate (APT) preparation is an important part of smelting tungsten, whether it is chemical precipitation method, ion exchange method or extraction method,they all have to go through the process of ammonium trioxide to produce qualified APT.   APT is an important tungsten intermediate products , the higher the purity the greater the value, so APT preparation process is also the further purification of tungsten. Neutralization is one of the most commonly used manufacturing method of para-ammonium tungstate, and it's settlement with hydrochloric acid and (NH 4 )  2   wo 4  solution, precipitation crystallization of ammonium paratungstate, and the energy consumption is small, crystallization speed is fast, easily to recovery the fine particle APT. The neutralization method is carried out in a reaction tank with a liner rubber. Heating with hydrochloric acid and (NH 4 )  2 WO 4  solution, ammonium paratungstate crystalliz...