Tungsten Trioxide Denitration Catalyst Creates a Myth of Clean Diesel Technology

Recently, a report said Volkswagen had altered diesel engines to beat emissions tests, which immediately caused the great anger of the consumers. The agency reported that some diesel powered vehicles made by Volkswagen and its subsidiaries Audi and Porsche contained software which can lower the emissions during tests; however, during the normal driving, the software has gone. On the discharge gate event, Mullen, the CEO of Volkswagen expressed they had especially tough to come through the past few months. On the road, the emissions of some vehicles can even reach up to 40 times as much NOx—a combination of nitric oxide and nitrogen dioxide—as allowed, which has caused enormous pressure on the environment protection.

Volkswagen CEO Murren denitration catalyst
 
In the atmosphere, nitrogen dioxide contributes to the formation of ground-level ozone and particulate matter, which create further negative health effects. A recent study estimated that the excess NOx can cause the additional unexpected deaths and damages compared with the regular emissions. In Europe, however, the excess NOx from the altered cars may have little impact, which shows the high NOx emissions have already upset the region, because it has weaker emissions regulations and more diesel powered cars. So the issue of balancing the NOx emissions control with fuel efficiency is a tough nut to crack.
 
In addition, the exhaust of diesel powered vehicles contains a lot of sulfur, which not only causes air pollution, but also causes the poisoning of the denitration catalyst for automotive exhaust gas, and influence the effect of exhaust treatment. Tungsten trioxide denitration catalyst makes the clean diesel technology not a myth. Since tungsten trioxide can improve the sulfidation resistance of the catalyst, it is widely used in the denitration catalyst. In addition, tungsten trioxide can also broaden the operating temperature of the catalyst, and make it suitable for the denitration catalyst under lean burn conditions; therefore, the denitration catalyst which contains tungsten trioxide has very broad prospect in the clean fuel technologies.

 

Defects of Large Tungsten Carbide Products in China

Theoretically, tungsten carbide is a kind of super-hard material that consists of refractory metal carbides and binder phase metal and manufactured by PM (Powder Metallurgy). And at the time of cemented carbide industry has just started, most of which are made of tungsten carbide WC and cobalt Co composition, referred to as tungsten carbide cobalt. Since WC-Co has simple structure, high hardness and excellent wear and corrosion resistance, it can be widely used in cutting, drilling, molding and other industries. Besides, tungsten carbide also includes WC-TiC-Co carbides, WC-TiC / TaC / NbC-Co carbides, steel bonded carbides and so on. Common tungsten carbide grades are YG3, YG6, YG8, YG10, YG12, YG15, YG20, YT15, etc, each grade due to the different ratio of WC and Co, with different performance advantages, some suitable for semi-finishing of non-ferrous metals and alloys, some iron alloy suitable for high-speed milling, some suitable for steel forgings, stampings and castings the surface finish.

Although tungsten carbide plays an important role in cutting tools, drilling tools and molding materials because of the excellent wear resistance and toughness, compared with higher hardness of diamond products, it has begun to face the danger of being substituted in some applications. Diamond is a mineral composed of pure carbon, which is the hardest substance in nature. There is little diamond in nature, so people through high temperature and pressure to convert the carbon into diamond nowadays. This synthetic diamond has higher hardness and better performance in strength, nearly a decade of development in our country very rapidly, particularly in some of the cutting tools and handicraft industries are becoming more common. In addition, diamond is also known as super-abrasive in stone, construction, industrial processing, aerospace, electronics, precision measuring instruments and other fields. Currently, due to the rapid development of the diamond industry, it is growing at a high speed to produce a lot of new diamond tools, some far more than conventional carbide tools in performance. Especially domestic priority level of technology and equipment, mainly in small and medium sized carbide rod and plate-based, there some defects in the large carbide products, which is the focus of the future is the development of domestic carbide industry.

tungsten carbide products

 

Discovery of Tungsten Ore Improves the Yield of Tungsten Heater

According to the China Nonferrous Metals Industry Network reported that Jiangxi Nonferrous Metals Geological Exploration Bureau discovered new tungsten ore bodies. After four years of mineral geological survey, the project "Xiushui County, Jiangxi Province Wanghuojian Tungsten Ore Census" of Jiangxi Nonferrous Metals Geological Exploration Bureau was checked and accepted by expert group with a good level. Through efforts from all sides, the Exploration Bureau discovered new tungsten ore and gold ore bodies. The expert group has carefully listened to the report of results of the project.

This is another important discovery after worldwide scale tungsten ore was found in Jiangxi in 2014. This major discovery makes the tungsten resources in Jiangxi form the new pattern "Three Pillars", which consists of southern Jiangxi, northern Jiangxi, and northwestern Jiangxi. It further established the position of "World Tungsten" of Jiangxi, improving the level of protection of tungsten ore resources, consolidating the discourse power of tungsten ore for China in the world. Therefore, this discovery plays a significance role on tungsten reserves and development. Analysts believe that, A-share listed companies, Chongyi Zhangyuan Tungsten Co.,Ltd, Jiangxi Copper Corporation, Xiamen Tungsten Co.,Ltd and other relevant local companies are expected to directly benefit from it.

Tungsten and its alloys is one of important functional materials for the modern industrial, defense and high-tech applications, which are widely used in aerospace, atomic energy, shipbuilding, automotive industry, electrical industry, electronic industry, chemical industry and many other areas. China, as one of the world's largest tungsten resources reserves countries, due to irrational exploitation of rare earth, and tungsten belongs to non-renewable resources, therefore, currently it is exhausted. And new discovery of the tungsten ore in Jiangxi, will improve the situation of tungsten resources to some extent. Tungsten is important raw material for tungsten heater and other tungsten products, so tungsten ore discovery will greatly promote the mass production of tungsten related products.

tunsgten ore and tungsten heater

Technological Innovation of Shizhuyuan Promotes Development of Tungsten Heater

Recently, the school enterprise cooperation project team of multi metal concentrator of Hunan Shizhuyuan Nonferrous Metals Co., Ltd. and Central South University transform the process flow of tungsten mineral processing, primarily through technological innovation and other means to improve the grade of tungsten concentrates and the recovery rate of tungsten. Reversing the downturn situation of tungsten industry recently. Multi metal concentrator of Hunan Shizhuyuan began to flotation separation test at the end of 2014, using the original wolframite slime idle flotation device. After testing more than five months, recovery and grade of tungsten have been greatly improved, this can be applied in practical production.

After getting good results, this plant promote technology to 2000 tons / day workshop tungsten roughing in August 2015, after technicians careful debugging for a period, the whole plant rougher tungsten segment has a stable milling of ores indicators. In order to further improve the efficiency of new technology tungsten beneficiation experiments, the technicians began a 24-hour spell line system from 2016, monitoring the experimental dynamic of index in real time. As a raw material of tungsten heater, constantly improve the beneficiation process of tungsten can not only improve the quality of products, but also ensure that supply number.

The development of innovative technology also improves the recovery rate, so that resources can be repeated used, which is good for the protection of the environment and greatly reduce production costs. The successful case of this plant plays a leading role on chinese tungsten industry, which is a revolutionary breakthrough in the field of mineral processing of tungsten, and promotes the development of related industries. In the fierce market competition, enterprises are facing a number of random changes. Enterprises can inspire the original and potential innovation vitality only to make innovations constantly that can brings abundant profit.

Shizhuyuan and tungsten heater

 

Crazy Tungsten Trioxide Photocatalyst TV Backdrop

TV backdrop is a concept which introduced from the decoration of public buildings, mainly refers to the side of the main wall in the living room, bedroom which reflects your décor; generally speaking, the placement of television is the visual center inside the house, the most unique place and the visual focus after you enter the door, serves to fill the open area of TV backdrop in your home space, while modifies the TV backdrop area.

tungsten trioxide and TV backdrop
 
However, with the improvement of people's living environment quality requirements, TV backdrop not only plays a decorative role, but also be given a more practical function role by changing its material. In recent years, haze tyranny in China, and cause serious harm to human health, and people turn pale at the mention of a haze. In this context, a lot of air purification products mushroomed soaring up. Photocatalytic technology is a very effective way to clean up the air, which is mainly in the context of the presence of the photocatalyst by light to decompose pollutants in the air, thus to purify the air.
 
Because of tungsten trioxide has strong oxidation ability, with its very narrow band gap it can make full use of visible light, and being a good photocatalyst. When the tungsten trioxide photocatalyst is irradiated in the sun or other visible light, electrons are excited into the conduction band, so that the conduction band be of negative charge; however, the valence band will generate the holes of positive charge because the electrons have been excited out, so, a oxidation - reduction system has been formed to play the role of decomposing pollutants. Besides, tungsten trioxide as a photocatalyst has the advantages of non toxic, pollution and so on. Just image that, the side walls will purify the air, so that you will free from the hazards of formaldehyde, haze ect., isn’t it a crazy thing?

 

 

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