Zou Zhiqiang and others studied the properties of amine tungsten salt and its application in the preparation of submicron tungsten powder, reported brown tungsten oxide for the first time, and summarized the properties and applications of amine tungsten salt. It is generally believed that ammonium paratungstate also has certain self-reducing properties. Using APT (Ammonium Paratungstate) as raw material, tungsten oxide with main phase W18O49 was prepared by converter circulation method. Chen Shaoyi reported the research results of purple tungsten oxide and W18O49 in the production of tungsten powder and tungsten carbide powder, proving that W18O49 is an ideal raw material for producing ultra-fine tungsten powder and ultra-fine tungsten carbide powder. Looking at the research results of various companies, it can be seen that the premise and key of preparing ultra-fine tungsten powder and ultra-fine tungsten carbide powder is to prepare W18O49 with as pure phase as possible and large specific surface area. Apparently, the black tungsten oxide prepared from amine tungsten salt has high carbon content, which deteriorates the process parameters for preparing ultrafine tungsten powder. However, the condition control of the APT converter circulation method is strict, the temperature is high, the time is long, and the product quality is difficult to guarantee.
Intrinsic reduction method to prepare blue tungsten oxide: Since the intrinsic reduction method uses intramolecular components as reducing agents, the reduction process can ensure uniformity at the molecular level. Matching the reduction ability of the intramolecular reducing components, the corresponding pure-phase reduction products can be obtained, and because a large amount of gas is generated during the reduction process, the particle size and distribution of the products can be effectively controlled. The low-priced non-integral tungsten oxide is prepared by thermal decomposition of oxalic acid tungstate hydrazine compound salt. Under suitable conditions, the product is black, the oxygen-tungsten ratio is close to 2.72, and mainly contains W18O49 phase.
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