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Haze Governing Advantageous Weapon - Tungsten Trioxide Desulfurization Catalyst

Details: Category: Tungsten's News; Published on Wednesday, 01 June 2016 17:40; Written by chunyan; Hits: 575

Diesel desulfurization came out a new technology! Recently, Chinese scientists have developed a new type of catalyst, which can produce the clean diesel with sulfur content controlled in the national V standard under the mild operating conditions on the basis of existing production processes and equipment. Currently, the catalyst was successful industrial trial run on 200,000 tons / year of diesel hydrogenation unit. According to the developers, the catalyst can be used in straight-run diesel fuel, straight-run diesel and diesel hybrid diesel catalytic and catalytic diesel ultra-deep desulfurization, thus to meet the national V, as well as indicators of future sulfur diesel requirements of the national VI.

Haze is the focus of ecological environment Thirteen Five-Year period, while motor vehicle exhaust emission is one of the major causes of haze. China has promulgated the legislation of enforcing to reduce the sulfur content in the fuel, and will carry out the State V diesel standard of a sulfur content of less than 10mg / kg before the end of this year. However, the most economic and easy way of diesel quality upgrading is to develop a high efficient hydrodesulfurization catalyst, to cut the sulfur pollution control from the source.

Of course, when the high sulfur content of the oil has been flowed into the market, we need to have the appropriate means to manage it. As we all know, the catalyst and non-precious metal catalyst which can be used in frequency combustion conditions have been developed for some time -- tungsten trioxide SCR desulfurization catalyst; with its active surface, it has catalytic oxidation can promote the direct reaction of sulfur dioxide, accelerate the dissolution of calcium carbonate, promote calcium sulfite rapidly oxidized to calcium sulfate, strengthen the precipitation of calcium sulfate, lower the ratio of liquid and gas, reduce the ratio of calcium and sulfur, reduce the evaporation of water. Thus, to maximize purify the sulfur dioxide and other harmful gases in the exhaust gas. Furthermore, since the tungsten trioxide catalyst can improve the properties of anti-vulcanization, anti-drug, anti-sintering ect., and thus to enhance the catalytic activity, improve the desulfurization efficiency, which makes it widely used in desulfurization catalyst.

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Li Chen Initiated "Running Blue", Tungsten Trioxide Denitration Catalyst to Cheer

Details: Category: Tungsten's News; Published on Wednesday, 01 June 2016 17:37; Written by chunyan; Hits: 662

Kenya PM local time on May 25, Li Chen as "Beijing environmental charity ambassador" attended the Second United Nations Conference on the Environment (UNEA2), in the conference he announced to initiate the "Running Blue" which is committing to publicize environmental philosophy and youth environmental technology. At the meeting, it issued the "Beijing air pollution control process: 1998-2013 Year" assessment report; the report notes that Beijing air pollution control measures had significant effect, which has created the learnable experience to other developing economies in the world.

The report shows, from 1998 to 2013, air pollution control measures which continually taken by Beijing improve Beijing have played positive role in the Beijing's air quality. During the 15 years, with Beijing's resident population, vehicle fleet, the total energy consumption all sharply going up, the concentration of sulfur dioxide, nitrogen dioxide and other pollutants are reverse declined year by year, and formed the initial situation of coordinated development of economic society and environmental protection.

Li Chen initiated running blue and denitration catalyst

Li Chen initiated running blue and denitration catalyst

The two major sources of air pollution are industrial emissions and automobile exhaust emissions, for the industrial waste gas, the use of SCR technology is currently recognized as the most effective way; in the past, the governing of vehicle exhaust pollution is mainly based on noble metal catalyst, however, with the recent development of non-precious metal denitration catalyst, SCR denitration catalyst containing tungsten trioxide is more and more used for the governance of automobile exhaust gas.

The currently universal application of SCR denitration catalyst is typically taking vanadium pentoxide as the main active material, and tungsten trioxide generally as an additive added to the SCR denitration catalyst to play the role of anti-sulfide, resistance of carrier compaction. Tungsten oxide denitration catalyst can be used in the governance of thermal power plants and other industrial emissions, vehicle exhaust, to improve the catalyst surface acidity, thermal stability and support denitration efficiency, and furthermore to exhibit excellent activity, high reducing efficiency of PM ect..

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Chinese Mines Reduce Production, Tungsten and Antimony Prices Rise

Details: Category: Tungsten's News; Published on Friday, 27 May 2016 16:47; Written by xinyi; Hits: 804

Tungsten, also known as wolfram, is a chemical element with symbol W and atomic number 74. Antimony is a chemical element with symbol Sb (from Latin: stibium) and atomic number 51. A lustrous gray metalloid, it is found in nature mainly as the sulfide mineral stibnite (Sb₂S₃). Antimony compounds have been known since ancient times and were used for cosmetics; metallic antimony was also known, but it was erroneously identified as lead upon its discovery.

Japan’s media said, the prices of rare metal tungsten and antimony rose, compared with the recent record low prices in mid-March, the international spot prices increase by about 20 to 30%, the main reason is China, the big rare metals country, began to reduce the supply and start the national purchasing and storage. According to the Nihon Keizai Shimbun’s report on May 26, tungsten as the raw material of superabrasive tools, the current price of wherein the intermediate material ammonium paratungstate (APT) is around $ 21.9 per kilogram, rose by 27% compared with the mid-March .

Since the autumn in 2015, eight mines in China began to cut production and reduce supply. Some companies of tungsten trading said, "We have always been in the deficit". It is cut back by 20% in 2016 than last year. It is reported that China’s purchasing and storage plan of tungsten concentrate started in April have had an impact on tungsten prices. About 10,000 tons of reserves, which is equivalent to about 10% of China's annual output. In addition, demand is very sluggish. Affected by the economic slowdown of China that is the largest consumer country, the demand of superhard tools shows weakness. While the prices of crude oil also made mines development in the United States and other countries stalled. The price of antimony that prevents burning synthetic resin is about $ 6,400 per ton, up by 22%. Since the Chinese government has strengthened the environmental protection measures, a number of manufacturers stopped production. Japanese manufacturers of antimony compounds claimed, "If the enterprise does not have the equipments without harmful substances powering when refining, antimony compounds can not be produced."

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Tungsten Copper Plasma Component Technology Breakthrough

Details: Category: Tungsten's News; Published on Wednesday, 01 June 2016 14:53; Written by xiaobin; Hits: 651

Recently, French Atomic Energy Commission (CEA) / Institute of magnetic confinement fusion (IRFM) researchers announced a good news: Institute of Plasma Physics, Chinese Academy of Sciences has made key progress in the development of two types of tungsten copper heat load (HHF) test module towards plasma components (W / Cu-PFC) test. Tungsten copper towards plasma component mainly refers to perforated tube. Tungsten copper perforated tube is one of the parts of vertical divertor target plates, and the divertor has been playing an significant role in magnetic confinement fusion reactor.

The main role of divertor is that the interaction between plasma and materials processing separated in two chambers and separates the resulting doping source and the main plasma. In general, it uses High heat load irradiation for the divertor properties testing, which is an important criteria to evaluate the quality of tungsten copper perforated tube. Tungsten copper not only has high melting point, high strength, low coefficient of thermal expansion, low sputter rate, low retention and excellent wear and corrosion resistance, etc., which is recognized as the most suitable for future nuclear fusion reactor plasma-facing materials. Tungsten copper perforated tube is first to drill on tungsten block, followed by brazing or hot isostatic pressing (HIP) block and other technology tungsten chromium zirconium copper pipe connected. Since it has symmetry in structure, can relief the thermal stress concentration and eliminate the stress point so that it can withstand high thermal loads irradiation.

tungsten copper plasma component

Tungsten copper perforated tube fabricated by HIP has well combining face and without any obvious cracks, but the wall thickness of the circumferential unevenness in the HIP process of collapse and cracking phenomenon occurs. This time, the Chinese Academy of Sciences has made a major breakthrough in the manufacture of technology in the international community for the first time to achieve mass production of tungsten copper PFC, tungsten plasma interaction to carry out a comprehensive study under the conditions of long-pulse high parameters and provides an excellent platform. According to IREM researchers report relevant results: W / Cu perforated tube (Mono-block) No. 4 block modules withstand 1,200 times 10MW / m2 and 300 20MW / m2 radiation heat load; No. 5 tungsten block withstood 500 10MW / m2 and 500 20MW / m2 radiation heat load beyond the International Thermonuclear Experimental Reactor ITER to 20MW / m2 radiation heat load 300 requirements. In addition, W / Cu plates (Flat type) module FT1 to withstand 102 times 10MW / m2,102 times 15MW / m2 and 302 times 20MW / m2 radiation heat load; Tablet Module FT2 withstood 302 times 10MW / m2,102 times 15MW / m2 and 102 times 20MW / m2 radiation heat load. Irradiation results far beyond the flat module 5 MW / m2 in the ITER design requirements, refresh the W / Cu plate member is known recording HHF tests. This also proves that the advanced nature of the plasma connecting tungsten copper PFC technology to some extent.

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Tungsten Market Short-Term Shocks

Details: Category: Tungsten's News; Published on Thursday, 26 May 2016 18:31; Written by xinyi; Hits: 1088

Two months of tungsten price continuous rising begins to turn around. On May 25, the average price of 65% wolframite is 76,000 yuan / ton, the price of APT is 120,000 yuan / ton, the price of medium grain tungsten powder is 190 yuan / kg, respectively, the average price fell 2,000 yuan / ton, 3,500 yuan / ton, 2 yuan / kg compared with that on last Friday (May 20).

Affected by tungsten enterprises limited production price and purchasing and storage news, tungsten price rose sharply in short term, which did not only fail to stimulate the enthusiasm of the industry, but made the upstream and downstream market trade sharply compressed, the price of tungsten lacking of market demand to support will eventually fall back, so there are reasonable demands for the price returning in the market itself. Price of tungsten products continued to rise, especially tungsten powder, tungsten carbide powder and other powder products, with the rapid rise. Although raw material prices were pulled up rapidly, the price of terminal carbide products has not been improved. Some alloy enterprises said that the current orders on hand were signed before a month and unable to increase prices. Some small and medium sized carbide producer claimed that they were prepared to discontinued at any time.

Influence by the high costs of raw materials, on the one hand the downstream business are difficult to accept it, on the other hand with the increasing prices of raw materials, there are attempts to raise the offer of their own terminal products. Combined with that the early result of tungsten concentrate prices rising, traders of tungsten concentrate storing a large number of goods leads to backlog of funds, the divergence of interests in the market of all parties, or cause short-term frequent shocks of price tungsten in the market, the base of the sharp decline is still not enough.

tungsten price chart

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