Tungsten Oxide-- New Material of Concrete Antimicrobial and Anticorrosive in Sewer

nickel and tungsten oxideSewer is the integral part of infrastructure in a city which plays an irreplaceable role in the living environment of safety, construction and comfortable. In recent years, the corrosion degradation has caused many social problems, such as the collapse of the road, and thus attracted widespread attention.
 
Sewer corrosion mainly brought out by the oxidation of sulfur-oxidizing bacteria and generated the sulfuric acid and hydrogen sulfide which constantly corrode the pipe surface. In the past, anti-corrosion protection of concrete structures sewer facility is mainly used in the surface coating or a coating method for coating a sheet of resin-based material. These methods have a big challenge in terms of construction; besides, the adhesion and anti-scratch is weak; with relatively short life (only 3 to 6 years). Therefore, a new material with strong anti-corrosion is called.
 
Recently, studies have shown that tungsten oxide and nickel as the antimicrobial agent doped in the concrete, pays the role of inhibiting the sulfur-oxidizing bacteria antibacterial activity, is a new anti-corrosion material with excellent durability. Sulfur oxidizing bacteria is acidophilus which the optimum growth pH range is 2~3; tungsten oxide dissolved in the acid which can inhibit the growth of sulfur-oxidizing bacteria with the joint function of nickel, thereby suppressing the formation of sulfuric acid. Compared to ordinary concrete, the corrosion depth of this concrete is only 1/5 of it, and the sulfur penetration depth of about 1/4 of it; presumably, that anti-bacterial concrete contains mixtures of tungsten oxide and nickel can ensure 50 years of standard service life. In addition, the experimental results of elution maximum body and toxicity of the antimicrobial concrete have shown that its toxicity is very low and does not cause adverse effects on the environment; what the most importantly is that as a building material, it doesn’t causes any negative effect compressive strength to concrete.

 

Tungsten Darts—Assisting for 2016 PDC Chinese Tryout

2016 PDC Chinese tryout is in full swing, the competition attracts many darts fans to participate, they want to show their strength in a fair and just stadium, and duke it out with many excellent dart players. Darts’ use plays an important role in a dart competition it can be described that it is essential for the final result. Tungsten darts have excellent hand feeling and are easy to control, that is why they can be welcomed by many darts players. The PDC's tryout is planning to divide into 10 tryout stations, including the successful ending of April 2 Qingdao station, April 9 Guangzhou station. In these 10 tryout stations, the first three stations is the selection of the World Cup 2016 qualification; the middle four stations, namely stations 4-7 is the selection of Shanghai Masters qualification; the last three stations is the selection of World Championships qualifications.
 
The third tryout trials will be carried out in Ningbo, April 23. The first two stations, Dawei Zhang gained the total score of 2: 1 and defeated the second player Li Weihong, got the first qualification of PDC World Cup 2016; and players Ouyang Bin, who came from Hunan 2: 1 defeated his opponent Hu Ling, who came from Hubei and won the victory in Guangzhou station. The China World Cup qualifying finals will also be held in Ningbo in April 24, therefore to select the top two players and they are on behalf of China to participate in the 2016 World Cup held in Germany in June 2016. Since the later tryouts are not associated with World Cup qualifications tryout, and therefore not yet notified the specific time and place of the game, and the subsequent news that we will follow closely. As a kind of the high-quality darts with a stable performance, high density, small air resistance, and non-toxic and environmentally friendly, tungsten darts have its own outstanding and excellent performance and are assisting for the 2016 PDC Chinese tryout.
 
the winners of Guangzhou Station and tungsten darts

 

China Tungsten Industrial Competitiveness Evaluated Based on Tungsten Products Export

tungsten concentrateTungsten is a valuable scarce resource, which takes about 0.001% in the earth crust. It is referred as “Tooth of Industry” because of its properties of high melting point, density, hardness. Tungsten and its products are widely used in modern industry, which is an important non-renewable mineral resource, its development closely link with national economic lifelines and security. To some extent, the situation of tungsten export over the years reflected the changes of China tungsten industry competitiveness in the international market; in 2015, China canceled the export quota and turned to the export license management system, which means tungsten manufacturers will have to rely on technology in order to survive, companies should focus on the optimization of high, refined, sharp and deep processing.
 
As we all know, the higher technical content tungsten product has, the higher value is will be. The breakthrough of improving competitiveness in Tungsten industry chain should be primarily in four areas of tungsten powder, tungsten carbide powder, tungsten materials and its special-shaped and tungsten carbide deep-processing products.
 
Over the last decade from Chinese tungsten export situation analysis, tungsten product export structure should be further optimized, and developed the high value-added products, the exported proportion of application products increased year by year, the international competitiveness of Chinese tungsten products increased year by year. However, the Chinese tungsten products deep processing technology still has a large gap comparing with the international advanced level. In future, the focus of the tungsten industry should be narrowing the technology gap of tungsten application compared with advanced foreign enterprises for some time. Accelerate the elimination of backward production capacity; accelerate the development of products with independent intellectual property rights of tungsten manufacturing technology for further enhancing the competitiveness of China tungsten industry. Such as the development of carbide cutting tools, mining tools, wear resistance parts and other leading products; developing high-properties of tungsten wire, as well as ultra-thin, ultra-large sheets of tungsten, new tungsten-based material applied in national defense, aerospace, military industry ect..

 

The CUDL is Starting Soon with Popular Tungsten Darts

In early March 2016, Chinese Darts Association issued the notice about the 2016 China University’s Darts League (CUDL). It is composed of races and finals; the playing time is from the beginning of April 2016 until the end of December. The races’ places can be arranged in chronological order as follows: Beijing Station in April, Hainan Station in May, Shanghai Station in June, Tianjin Station in July, Qingdao Station in August, Harbin Station in September, Guangzhou station in October, Jinan Station in November, and Nanjing Station in December. Contestants are college students of major colleges and universities in the way of the team or group. Each school can choose to send four teams; each team must be not less than 4 people and have a female member at least. Competition is divided into community groups, women's groups and men's groups, if the group integration standings of the previous 64, women's and men's athlete's personal ranking the first 128, then can enter CUDL finals.
 
This competition obtained great attentions of China’s major colleges and universities, and the darts that being welcomed by many participants are mainly tungsten dart. Usually tungsten dart for game is made of 90% tungsten, because the tungsten content is too high will increase the brittleness of darts, it will occur the fracture problem if do not use carefully. Due to the high density property of tungsten alloy, it can achieve high specific gravity with small size. That tungsten darts volume can be made very small, but the weight and hand feeling is still the same, and will be very easy to carry. That is why a tungsten dart is welcomed by people. In addition, tungsten dart with good stability and maneuverability is easy to control, so it is the first choice of dart for many people in competition, and being greatly popular among the participants of CUDL. We will continue to focus on the subsequent game messages.
tungsten darts and integral table

 

2015 China Tungsten Products Import and Export Market Analysis

1. Structure of tungsten products export and import analysis
By 2015, intermediate goods accounted for 69.94% of total export, being the fourth year which below 80% of the whole and the second year for consecutive less than 70%; the export of tungsten material, tungsten carbide accounted for 30.06% of total exports, the pattern that exports tungsten intermediate products as the center gradually change. Tungsten concentrate still being the center of tungsten products import, accounting for 72.79% of total imports, down 0.28 percentage points, and the proportion continued to decline.

exported region distribution for tungsten products from 2011 to 2015
 
2. Import and export tungsten products market analysis
Europe, the United States, Japan and South Korea are the four main destinations for Chinese export tungsten products. By 2015, the amount of tungsten product export to South Korea grew 22.98 percent, while the amount of tungsten products exports to Europe, the United States and Japan fell down respectively 2.83%, 34.94% and 4.84%. Among them, American decline prominently, first one maybe the reducing and stopping production oil, shale gas drilling in US; the second is the US tungsten manufacturer opened up new sources of raw materials. The amount of tungsten products which exports to the above four countries accounted for 87.07% of total exports, decreasing 1.82 percentage points compared with 2014. Wherein the amount exported to Europe, America, Japan and South Korea respectively account for the total of 26.11%, 13.93%, 25.39% and 21.64%; besides South Korea and Europe accounted respectively decline for 6.63% and 0.23% over the same period. European and Japanese market is relatively stable; the reducing rate of United States is the largest; while South Korea increasing significantly.
 
By 2015, the amount of tungsten which China imported from Asia, Europe, Africa and North America accounted for respectively 44.73%, 27.29%, 18.40% and 4.94%, imported from the four region above accounting for 95.36% of total imported tungsten products, increasing 5.69% over the same period; imported from Asia grew 1.46% over the same period, imported from Europe, Africa and North America decreased respectively 45.09%, 5.72% and 49.12%. By 2015, China imported tungsten concentrate from Mongolia, the Russian Federation, Rwanda, Myanmar and Brazil accounted for 84.22 percent of total imports of tungsten concentrate, increasing 5.58% over the same period. The amount of tungsten concentrate imported from Mongolia, the Russian Federation, Rwanda, Myanmar and Brazil takes respectively 24.22%, 21.87%, 10.05% and 3.26% of the total; Mongolia, Rwanda and Myanmar increased 8.99%, 9.46%, 7.99% compared to 2014, the Russian Federation and Brazil decreased 16.10% and 4.76% respectively. The top 5 tungsten ore sources changed, Mongolia went up to No.1 from the second, the Russian Federation decreased to the second from No.1, Rwanda held the NO.3 which unchanged, Myanmar moved to No.4 from NO.8, Brazil dropped to NO.5 from NO.4. By 2015, there were no tungsten ore importing from Canada and the Vietnamese which have ever been the main source.

 

 

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