Tungsten Oxide

At present, 50 to 60% of the world's tungsten is used for the manufacture of tungsten carbide. Among them, rock drills in mining tools, three-cone drills in oil extraction, and coarse-grain tungsten carbide used in the hobs of tunnel shield machines account for a considerable part of tungsten carbide. As the main product of tungsten resource consumption, tungsten carbide can be used as the raw material to synthesize tungsten carbide directly. The tungsten carbide particles can greatly shorten the smelting process, and the ultra coarse grain tungsten carbide particles are widely used in mine rock drilling tools, which have higher added value than the general tungsten carbide. Some scholars have proposed a method for preparing coarse grained tungsten carbide directly from tungsten ores. The main process is as follows: Synthetic scheelite was synthesized from pure sodium tungstate and calcium chloride. Spare after drying. According to the mass ratio of 33:43:8:9:7 to weighing artific

With the development of shipping industry, marine and river water pollution caused by ships is becoming more and more serious. Some researchers have proposed a scheme of photocatalytic treatment of ship oil sewage by pre separation + fine filtration + deep oxidation. (1) The oil sewage from the upper part of the tank is pumped into the direction of the upper entrance of the pool in tangential direction, forming a rotating flow, which is divided into a cylindrical type. Under the action of the centrifugal force of water, the oil particles with relatively small relative density converge to the central part of the pool and float up, so that the coarse oil particles are separated out in advance. (2) Through the pre separated oily sewage into the fine filter, the fine filter is in turn from top to bottom, including overflow trough, filter material partition board, biomass filter layer, filter material bearing layer, filter material separator with pore size less than biomass filter material,

A large number of domestic sewage and industrial waste water are discharged into rivers and lakes, resulting in eutrophication of water bodies, affecting the safety of water and living environment. The algae outbreak will cause the oxygen depletion in the water to lead to the death of the fish. The toxins released by some algae will poison the organisms. We should deal with the algae pollution quickly and effectively. It is an urgent need to control the water pollution. At present, algae removal in water is often done by manual removal, and the treatment efficiency is low. Researchers have developed a new method for purifying algae: magnetic nanomaterials using solid phase, montmorillonite with porous materials as adsorbents, non-toxic and harmless adsorbents, adsorbents for algal porous materials and bismuth tungstate , a photochemical agent used to degrade algae and algae toxins. The method of scheme preparation is as follows: (1) First, the adsorbents are evenly dispersed in water a

At present, the market of electrochromic technology is quite extensive. Most of the electrochromic glass windows are made by applying translucent indium tin or fluoride tin oxide film to two pieces of glass to obtain electrical conductivity, and then apply electrochromic tungsten oxide to one of the glass, and then glue two pieces of glass together with a kind of glue like electrolyte. Electrochromic materials are divided into inorganic materials and organic materials. Inorganic materials can be divided into metal oxides and covalent metal complexes. The representative material of metal oxide is tungsten trioxide (WO 3 ). The principle of discoloration is mainly that the energy of the inorganic material falls within the energy range of the visible light region, so when the valence of metal oxide changes, it can just cover the visible light area, reflect the color we see in the naked eye, and some special tungsten oxide derivatives. The compounds even possess bipolar characteristics of