Tungsten is a very important strategic resource. With the development of the following products, tungsten wire, tungsten powder, tungsten strip and other high-end cemented carbide require continuous improvement of ammonium para tungstate. The existing national standard zero grade ammonium para tungstate can not meet the requirements of high end cemented carbide, which not only deals with the impurities and physical properties of ammonium para tungstate. A certain requirement can be put forward, and the enterprises that produce some high-end products have put forward special strict requirements for individual impurity elements. Therefore, the high purity tungsten powder is more popular in the market.

Industrial wastes containing heavy metals such as copper, nickel, cobalt, manganese, tungsten, and other heavy metals are treated by proper methods, and the valuable components of the industrial waste can be recycled, the harmless and resource utilization of industrial waste can be realized. At present, the method of metal recycling for such industrial wastes is usually used by alkali leaching, using sodium hydroxide or sodium carbonate as leach agents. The tungsten is leached under normal pressure or pressure condition, and tungsten is separated from other metals, and the tungstate solution is obtained by ion exchange and enrichment in the next step, the alkali leaching residue is then soaked in acid. Removal of impurities, separation and purification of copper, nickel, cobalt and manganese products.

With the development of electronic industry, the demand for pure tungsten special-shaped parts is increasing. Tungsten shaped parts are of great importance in aerospace, military industry and nuclear industry. Especially in the field of semiconductor technology, Bluetooth, Wi-Fi, 3G and other applications are booming. The ion implantation machine is the main equipment for the production of semiconductor crystal garden. 

The alkaline decomposition method of high calcium tungsten ore is first grinding with high calcium tungsten minerals (tungsten concentrates, wolwolwoltungsten medium ore, wolframite, high calcium tungsten fine mud, calcium containing 3%), and then the grinding high calcium tungsten minerals and high concentration alkali are added together in the ordinary stirred autoclave, at the temperature of 130-200°C and pressure 0.15-1.0MPa. Under the conditions of heat preservation and pressure cooking, after the pressure cooking is unloaded, the filtration and washing are carried out at a certain temperature and NaOH concentration, and the sodium tungstate solution is purified. The sodium tungstate solution contains WO₃ 80-300g/L and the free NaOH is 90-280g/L.