US Congress Met Water Pollution, WO3 Photocatalyst Solves Lead Pollution
- Details
- Category: Tungsten's News
- Published on Thursday, 07 July 2016 18:23
- Written by chunyan
- Hits: 509
Congressional office in Washington, the capital of America has recently undergone an incident of lead in drinking water exceeded; on July 5th, Capitol Building Department announced that they will arrange blood lead levels detecting for the congressional members and staff for free. A week ago, congressional office has detected the excessive of the lead level of the drinking water, then the drinking water pool was suspended; It is reported that, at least a pregnant woman of the employee of Congress has drunk the “lead water", we knew that the lead is particularly harmful for the unborn fetus; previously, Flint, Michigan City was exposed the water pollution crisis, and dozens of children were detected lead levels excessive. June of this year, source has reported that the problem of lead contamination of drinking water of United States is very common, cheating has been taken to conceal the problem of excessive amount of lead in water in many places.
Lead, a toxic heavy metal, is the known toxic substances which recorded most in the book, some ancient books has recorded that the use of lead pipes conveying water is dangerous. However, there are still a lot of water pipes of some parts in homes and buildings are made of lead. These lead making water pipes are the main supply pipe or part of the pipeline which is connected to the residents of the home, thus part of lead will dissolve in the water to cause lead pollution.
In recent years, tungsten trioxide (WO3) as a photocatalyst material has caused great concern; WO3 with semiconductor property, its photocatalytic reduction effect is shown to effectively solve the pollution problems of chromium, mercury, lead and other heavy metal ions. Especially, the WO3 with nano particle, due to its large specific surface area, it can fully enhance the efficiency of the reaction. However, the pure tungsten trioxide is easy to occur the light corrosion, and with the low utilization of visible defects and difficult to obtain a stable light catalytic properties, therefore, the modification technologies of metal ion doping, such as yttrium (Y), praseodymium (Pr) and so on; non-metal-doped miscellaneous, such as C; semiconductor composite, WO3/ZnO, WO3-TiO2 ect.; polyhydric doping are used to enhance its property. With the continuous researching on photocatalyst, tungsten trioxide photocatalyst will play a huge role in the lead pollution and other water contamination.
| Tungsten Oxide Supplier: Chinatungsten Online www.tungsten-oxide.com | Tel.: 86 592 5129696; Fax: 86 592 5129797;Email:sales@chinatungsten.com |
| Tungsten News & Prices, 3G Version: http://3g.chinatungsten.com | Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn |
Tungsten Trioxide Photocatalyst Solves Mercury Pollution
- Details
- Category: Tungsten's News
- Published on Thursday, 07 July 2016 18:20
- Written by chunyan
- Hits: 829
In June, a primary school of Huayuan County of Hunan Province, China, occurred a serious mercury poisoning (Minamata disease) of many students, which resulted in 147 students urine mercury exceeded; its cause is a fifth-grade student took 50 ml of the remaining mercury in the wok of a waste workshop in a mineral water bottle to school, and gave it to the other students for playing. According to the source, this workshop was illegal constructed and operated unauthorized without Environmental Impact Assessment (EIA) and related procedures. For this accident, I am showing my deep sadness, someone innocent was suffered a serious injury because some unscrupulous manufacturers do not manage their hazardous substances.
China as the largest country which uses and emissions most in global mercury, and has faced with the tremendous pressure to reduce emissions of mercury reductions in the "global mercury instrument" negotiations. This year, on June 18th to 19th, "the second national mercury pollution control and monitoring technology seminar" held in Yancheng, Jiangsu Province of China, the main focus of the meeting lies in deeply discussing the hot spots and focus issues of the policy standards mercury pollution control and monitoring in the field of technical support, solutions, industry trends, monitoring system and management system, and so on; furthermore, it provided decision supporting to in facing with the mercury pollution problems of socio-economic development process.
Mercury is a quite rare element in the earth's crust, which is the only kind of liquid metal. Mercury pollution (Hg2+) is one of the major heavy metal pollutions in the water, which has lethal hazards on the human nervous system. Studies have shown that, in the photocatalytic reduction experiment of Hg2+ of tungsten trioxide photocatalyst, Hg2+ was strongly adsorbed on surface of tungsten trioxide, and its adsorption amount increased as the increasing of pH value. In addition, experiments found that the adsorbed Hg2+ by tungsten trioxide still exist in the form of oxidation states which means it won’t occur reduction. Thus, Hg2+ in the wastewater has been taken by the photocatalyst, to eliminate mercury pollution. In addition, the recovery of Hg2+ can be separated with the photocatalyst, and then through the certain supporting of technical to recycle the mercury, and to realize resources recycling.
| Tungsten Oxide Supplier: Chinatungsten Online www.tungsten-oxide.com | Tel.: 86 592 5129696; Fax: 86 592 5129797;Email:sales@chinatungsten.com |
| Tungsten News & Prices, 3G Version: http://3g.chinatungsten.com | Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn |
Surface Morphology during Tungsten Electrode Operation
- Details
- Category: Tungsten's News
- Published on Wednesday, 06 July 2016 18:49
- Written by yiping
- Hits: 652
After 5 seconds arcing, observed tungsten electrode surface morphology found, the tip of electrode has many projections. And this is mainly because the tip affected by current and high-frequency the surface rudimental oxygen will react with tungsten to generate volatile tungsten oxide under heat effect and since arcing was carried out in an argon atmosphere, so the tungsten oxide which produced at the tip will take away by argon gas, leaving relatively clean tungsten grain. However, with arcing time increase, the tungsten which in the middle part of the tip tungsten will react with residual oxygen to produce tungsten oxide. And this tungsten oxide will bring to the top of tip which has higher temperature by argon flow. During the process, tungsten oxide decomposition occurs to form metal tungsten. Besides, tungsten deposition led to form the projection on the tip. However, this structure is prone to produce high frequency discharge and plasma. Not only tungsten and oxygen can react to produce gaseous tungsten oxide, but low-melting substance such as rare earth nitrate in tungsten electrode during arcing process will have diffusion, migration, volatilization and deposition, which is conducive to high-frequency arc starting and stable arcing.
After one minute arcing, observed morphology found due to longer arcing electrode material has undergone obvious recrystallization. The tungsten film which deposited at the before affected by heat will along the grain to growth and only new deposited tungsten film shows amorphous membranous tissue. In the one minute arcing, the tungsten electrode surface covered with typically equiaxed recrystallized structure tungsten film.
After 5 minutes arcing, the root of tip, due to the lower temperature so there is showing processing state fibrous tissue. In addition, compared the electrode tip morphology after five minutes arcing and one minute arcing found there is little change in appearance, indicating that arcing after one minute the electrode enters a relatively stable state and can stable work .
| Tungsten Metals Supplier: Chinatungsten Online www.tungsten.com.cn | Tel.: 86 592 5129696; Fax: 86 592 5129797;Email:sales@chinatungsten.com |
| Tungsten News & Prices, 3G Version: http://3g.chinatungsten.com | Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn |
Tungsten Copper Tube Type Divetor Component Developed Successfully
- Details
- Category: Tungsten's News
- Published on Thursday, 07 July 2016 15:19
- Written by tang
- Hits: 632
Chinese Academy of Sciences for the ITER plasma has developed through tungsten copper tube type divertor components small modules completed high heat load test on the specified test platform, six test modules submitted all through testing and certification. It indicates that Chinese scientists have already with capacities that developed tungsten copper tube type divertor components for ITER.
Divetor component is the necessary ways for tokamak discharge in the process of controlling impurities and fuel recycling; exhaust heat and particle flow and helium ash from the center of the plasma, which also are the most critical components of ITER device.
The design specifications of tungsten copper tube type structural component are to withstand high thermal loads irradiation of 5000 10MW / m2 and 300 20MW / m2. However, since the thermal expansion coefficient and elastic modulus with greatly difference between tungsten material and tungsten copper alloy heat sink materials, the surface of tungsten copper will in higher thermal stress when it in the process of preparation and application. So tungsten copper tube type components is too difficult to developing.
The test module through the 5000 series of 10MW / m2 and 1000 20MW / m2 heat load cycle electron beam irradiation, exceeding the requirements of ITER. Which approved the plasma tungsten copper divertor’s advanced technology development. ITER Director-General Bernard Bigot be given due recognition and appreciation.
| Tungsten Copper Supplier: Chinatungsten Online tungsten-copper.com | Tel.: 86 592 5129696; Fax: 86 592 5129797;Email:sales@chinatungsten.com |
| Tungsten News & Prices, 3G Version: http://3g.chinatungsten.com | Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn |
5 Companies Fined More Than 3.5 Million Yuan, WO3 Desulfurization Catalyst Reduces Acid Rain
- Details
- Category: Tungsten's News
- Published on Wednesday, 06 July 2016 17:53
- Written by chunyan
- Hits: 664
Recently, media reports said Development and Reform Commission (NDRC) of Yunnan Province have maken out the illegal administrative penalties of 5 electric powder enterprises for confiscating their illegal incomes, the total illegal incomes of more than 3.50 million. It is reported that the major reason of the five electric powder enterprises to be punished including that generated and outwardly supplied electricity during the outage of desulphurization facilities, related emission concentration index hourly average exceeds the limit but still requires enforcement of environmental price, and so on. In this regard, I express my deep sorrow, as well as have no more agree for the treatment of NDRC, how dare they generated power under the outage of desulphurization facilities? Today, the whole world is doing environmental protection work, and you commit a crime in spite of a law-enforcement campaign, anyone without you not to be punished?
The pollution of sulfur dioxide has exceed the smoke pollution and become the first atmospheric pollutants, with the world’ industrialization continues to deepen. Flue gas desulfurization (FGD) is currently the world's only desulfurization method of large-scale commercial applications, and also the most effective and main technical means to control acid rain and sulfur dioxide pollution. Desulfurization tower is commonly used in desulfurization facilities, and the desulfurization catalyst is a core technology used in desulfurization project, the surface of WO3 desulfurization catalyst has tension which can reduce the surface tension of limestone slurry and the critical nucleus radius, thereby strengthening the bisulfite oxidation precipitation of gypsum, to achieve the goal of sulfur dioxide emission reduction.
Tungsten trioxide (WO3) is an important intermediate product from tungsten concentrates to pure tungsten; the large amounts of WO3 are used in the production of pure tungsten, tungsten carbide, etc; In addition, as WO3has catalytic property, it can either as the main catalyst (photocatalyst), and also can be used for preparing denitrification, desulfurization catalyst. In the desulfurization catalyst, WO3 as a main active material which uniformly loading on the carrier, serve to reduce the desulfurization reaction activation energy, and also play the roles of anti vulcanization, anti-sintering of carrier, thereby enhance the desulfurization efficiency and achieve the goal of emission reduction.
| Tungsten Oxide Supplier: Chinatungsten Online www.tungsten-oxide.com | Tel.: 86 592 5129696; Fax: 86 592 5129797;Email:sales@chinatungsten.com |
| Tungsten News & Prices, 3G Version: http://3g.chinatungsten.com | Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn |
sales@chinatungsten.com
闽公网安备 35020602000140号