In the process of producing APT, about 10% ~ 15% of tungsten enters all kinds of slag washing water and APT crystallization mother liquor, the tungsten concentration of this solution is relatively low. The sediment filtrate and discharge waste water contains WO₃ about 0.1 ~ 2g/L, the exchange fluid discharged by the ion exchange contains about 0.1 ~ 0.5g/L of WO₃, and the mother liquor of evaporation crystallization contains WO₃ about 5 ~ 20g/L. The recovery and utilization of these tungsten containing wastewater is particularly important, and all tungsten smelting manufacturers attach great importance to it.

At present, the recovery and processing of tungsten waste has become a large scale, forming industry, mainly using tungsten waste to treat the sodium tungstate with wet process. This method has a large amount of treatment and is widely used for the tungsten containing waste. However, this method has serious pollution to the environment and the process is more complex.

At present, there are two methods for the production of ammonium paratungstate. First, the industrial sodium tungstate solution is first made to make white tungsten, then the concentrated acid is made into tungstate under the condition of heating and cooking. Then tungstate is made into ammonium paratungstate. The industrial sodium tungstate solution through anion exchange resin and then rinse with concentrated ammonium chloride, so that tungsten is made into ammonium tungstate. Then, the tungsten is made into ammonium tungstate. It is evaporated into ammonium paratungstate. Both of two methods have no molybdenum removal. To achieve the purpose of removing molybdenum, or to reduce the crystallization rate of ammonium paratungstate to 70-80%, the mother liquid should be removed from molybdenum after reducing the crystallization rate.

Selective catalytic reduction (SCR) technology and its key equipment denitration catalyst industry have been vigorously developed for the treatment of thermal power plants. Vanadium tungsten (molybdenum) titanium catalyst is the most widely used SCR denitration catalyst in SCR technology.

Molybdenum and tungsten are strictly controlled impurities in tungsten and molybdenum metallurgical products. The national standard GB10116-88 of our country stipulates that molybdenum is not more than 20ppm in the 0 grade ammonium paratungstate, the national standard GB/T3480-2007 stipulates that MSA-0 molybdenum acid is not more than 150ppm in the product. When dealing with molybdenum scheelite, waste catalyst and other raw materials, they are faced with the task and difficult problem of separating tungsten from molybdenum in solution.

The main method of producing super coarse grained cemented carbide is the use of super coarse tungsten carbide powder and cobalt powder as raw materials. It is pressed and sintered to become a product after batching, ball milling, drying and granulation. However, the ultra coarse tungsten carbide powder will break in the process of ball milling, and the grain size will decrease greatly. During the sintering process, the WC grain can not grow into an ultra coarse grained WC grain.

TFT film has the advantages of high responsivity, high brightness and high contrast. It is one of the basic materials in many industries. Therefore, it is widely used in the fields of solar cells, liquid crystal displays and plasma displays. In recent years, along with the rapid development of high-end displays, tungsten molybdenum alloy rotating target is an important material for preparing TFT film.

In the existing technology, the synthesis of tungsten oxide nanowires is mainly included in the following methods: high temperature vacuum vapor deposition, surfactant method, or anodic alumina template method. Compared with the above methods, the hydrothermal preparIn the existing technology, the synthesis of tungsten oxide nanowires is mainly included in the following methods: high temperature vacuum vapor deposition, surfactant method, or anodic alumina template method. Compared with the above methods, the hydrothermal preparation process is very simple and most widely used.ation process is very simple and most widely used.

arsenicTungsten carbide powder is the main raw material for the preparation of cemented carbide. At present, the preparation of ultra-fine tungsten carbide powder mainly includes conventional tungsten oxide hydrogen reduction-carbonization method, tungsten oxide direct reduction carbonization method, plasma chemical synthesis method, mechanical alloying method. The quality of tungsten powder directly affects the performance of cemented carbide products. In order to obtain high-performance ultra-fine WC-Co cemented carbide, the grain size of tungsten carbide must be controlled. Therefore, the preparation of ultrafine tungsten carbide powder with good dispersibility and uniform particle size distribution is the key technology for the preparation of ultrafine grained WC-Co cemented carbide.

At present, the content of WO₃ in white tungsten flotation tailings in many mines has reached more than 0.2%, even as high as 0.4%. These tailings are very low in floatability due to strong inhibition of inhibitor water glass, and the size of the inlay is very fine. It is very difficult and difficult to recycle.