回收四氯化硅化解多晶硅产业瓶颈[1]（Recycling four chlorinated silica polysilicon industry bottleneck [1]）

回收四氯化硅化解多晶硅产业瓶颈[1]（Recycling four chlorinated silica polysilicon industry bottleneck [1]） 回收四氯化硅化解多晶硅产业瓶颈[1](Recycling four chlorinated silica polysilicon industry bottleneck [1]) Industry information News Most of the advantages are sold to the middle east. High end products continue to withdraw from the international Market, while low-end products are exported to remote areas, resulting in titanium dioxide in our city The export price of powder is far lower than import price. According to the manager of the foreign trade company, after July, our city titanium dioxide The export volume of the powder is about 80% lower than that of Panzhihua Iron and Steel Co., Ltd. and Chongqing titanium industry of Panzhihua Iron and Steel Co., Ltd. Xinhua Chemical these two Chongqing local titanium dioxide producers, the current monthly Exports also dropped from 1500 tons to about 200 tons. Industry faces reshuffle Contraction of foreign markets, and strive to move to the domestic market, is now a lot Domestic titanium dioxide manufacturers must not practice. According to the manager of the foreign trade company introduced, at present, the national titanium dioxide powder The output is about 900 thousand tons per year, while the national demand is about 1 million 100 thousand tons. Because many domestic enterprises can not produce high-end titanium dioxide products, because of the production of high-end titanium dioxide products This part of the product also relies heavily on imports. In fact, with the domestic real estate, automobile, energy, communications and so on The rapid development of the industry, as well as high-grade building and industrial coatings (paint), Building plastic steel doors and windows and other demand for high-speed growth, the domestic market for high-end titanium The demand for white powder continues to increase, it is understood that the current DuPont Co and Arab Israeli Two large titanium dioxide powder factories established in Shandong and Liaoning respectively Production plant, the initial size is about 200 thousand tons / year, is expected in 2010 Completed and put into production. It is reported that the completion of the two major production base of titanium dioxide chloride After the main production of cutting-edge products, those in the international market setback after the turn It is still difficult to survive the domestic titanium dioxide Market in the domestic market Forecast。 In the past two years, many manufacturers in the titanium dioxide industry are making capital storage Preparation and technical reserves to study the production of high quality titanium dioxide, but are currently subject to The impact of domestic and foreign markets, many small enterprises have been precarious, titanium White powder industry is facing the risk of reshuffle." The manager told the story Who. Nanoscale materials have been studied with extraordinary means" At present, carbon nanotubes have been used in composite materials, biosensors and so on Nano circuits and other technical fields. However, it has been applied in many ways However, it is not clear what happens to the molecular nanotube at the end What kind of situation?. For example, how do carbon nanotubes and chemical functional groups phase each other? Interaction. The answer to this problem will help people improve the future of Nanotechnology Device. To seek answers to questions, the Lawrence Livermore state of the United States The laboratory team used chemical force microscopy for the first time The specific interaction between single functional groups and carbon nanotubes was measured Ability. The chemical force microscope method is a kind of tiny spring sensor A nanoscale technique for measuring minute forces; a functional group is a molecule The smallest special group of atoms that determine the chemical reaction of the molecule Characteristic。 From the development of new sensors and nano device engineering in the future It is necessary to understand the interaction between carbon nanotubes and chemical functional groups The role of. Carbon nanotubes are very small, which makes it difficult to measure single crystals Adhesion of a molecule on the surface of carbon nanotubes. In the past, researchers could only Dependence model, indirect measurement and large microscale experiment. American Research Group The new results make the research a step forward: they will probe nanotubes The contact area is reduced to... 1.3 nm, and thus can be accurately measured The adhesion between single functional groups and carbon nanotubes, and the phase between them Interaction. In the latest report, researchers said they found The interaction between carbon nanotubes and functional groups does not follow conventional poles The trend of chemical enhancement depends on the complex electron phase between them Interaction. Aleksand Noe, the main author of the report, Their work has led to a new approach to the study of chemical force microscopy Field. The new research has created a new situation for nano materials science research. measure The ability of the interaction between the functional groups and the carbon nanotubes can help people In the future, nano composite materials, nano sensors or molecular assemblies will be designed, Eliminate man-made guesses, so as to make better and stronger materials and more Sensitive devices and sensors. Recycling the bottleneck of polysilicon industry by four chlorinated silicon With the large-scale development and utilization of green energy solar energy, photovoltaic power The use of polysilicon in raw materials is becoming more and more extensive, and the consumption is also increasing, In recent years, the polysilicon industry in China presents the development trend of geometric series. Especially This year, more than a dozen polysilicon projects have been announced in China Or put into production. However, with the increase of polysilicon production in China year by year, The problem of safety and environmental protection of by-product silicon chloride four, a by-product of polysilicon production Prominent, how to safely deal with four silicon chloride has become related to polysilicon production The key problem of healthy development of industry. Four silicon chloride is the largest by-product produced in the production of polycrystalline silicon, Untreated and recovered four silicon chloride is a strong corrosive poison Hazardous liquid, which is very harmful to the safety and environment. Industry experts predict, By 2010, China's polysilicon production capacity will be expanded to around 17 thousand tons. According to the best control level at home, the production of 1000 tons of polysilicon will be produced Four silicon chloride 8000 tons, according to this calculation, by 2010, if polysilicon production The amount reached 12 thousand and 500 tons, four silicon chloride production will be more than 100 thousand tons. In the past few years, the total output of polysilicon in China is not big, and the problem of four silicon chloride is also Sixth phase of China powder industry in 2007 Industry information News Not prominent. And once the total output of domestic polysilicon exceeds 10000 tons, four chlorine Silicon will become a major problem restricting the development of polysilicon. Therefore, CAS Polysilicon materials experts have repeatedly worried about that, accompanied by polysilicon Production expansion, by-products recycling should also keep up with. Otherwise, the big gauge Mold production will bring great hidden danger to safety production and environmental protection. There are two main methods for treating four silicon chloride at present One is the reduction of hydrogen to polycrystalline silicon under high temperature and high pressure A raw material trichlorosilane, the conversion rate is the key method is two; Production of fumed silica with high added value by using four silicon chloride. Foreign owners Companies such as Germany Wacker polysilicon, etc. is used after Japan Tokuyama A method for producing polycrystalline silicon and producing white carbon black by gas phase method is described Carbon black and polycrystalline silicon production are closely integrated, forming a complementary resource, mutual Industrial chain of common utilization and development. It is understood that compared with the international advanced level, domestic polysilicon production The gap of industrialization in enterprises mainly lies in backward process equipment, The consumption of materials and electric power of similar products is too large, and the amount of "three wastes" is large. and At present, the domestic polysilicon project has been put into operation and is being carried out in four chlorination In the aspect of integration and utilization of silicon, a few enterprises choose hydrogenation reduction technology However, up to now, this technique has a lot of disadvantages due to low primary conversion rate The vast majority of enterprises have to face the by-product because of the limitation of its application An embarrassing situation that is unable to digest and hinder development. Guangzhou jibishisheng tech. Industrial Co., Ltd. is the first domestic master four Silicon recovery and utilization technology enterprises. It is understood that the company went through... 5 In the year of efforts to tackle key problems and independent innovation, we have mastered the recovery and utilization of four chlorination The core technology of silicon is used to produce gas phase with four silicon chloride as raw material Scale production technology of white carbon black. In 2007, the company Jilin and Two major production bases in Zhejiang can digest more than 5000 tons of four silicon chloride, If all goes well, next year will digest about 15 thousand tons of four chlorine The bottleneck problem of silicon industry restricting the rapid development of polysilicon industry is expected to be solved No. According to Dr. Wang Yuelin GBS company, with their four silicon chloride Preparation of fumed silica from raw materials, In addition, the exhaust gas passes through the production process The hydrogen obtained from the separation can also be used to produce fumed silica. The by-product hydrogen chloride produced during the synthesis of fumed silica Can be used to produce polysilicon raw material trichlorosilane. Utilizing polysilicon industry The production of fumed silica by by-product is an economic and ring The technology of double benefit has solved the problem of bound polysilicon industry The bottleneck of the development has promoted the development of polysilicon industry and promoted the development of polysilicon industry The rapid development of fumed silica industry leads to new materials in China Development of material industry. The integration and recycling of this resource have promoted The development of each other forms a virtuous circle, plus polysilicon and gas phase method White carbon products are in short supply in China, and the economic and social benefits are not Appreciable. Jiangxi will become an important base of silicon material industry in China News from Jiangxi provincial development and Reform Commission showed that Jiangxi Province silicon materials and The introduction of the development of photovoltaic industry, the general idea, high purity silicon, polycrystalline silicon 6 major areas, such as ingot, have become the focus of the industry development in this province. According to compasses By 2010, the annual sales revenue of the silicon materials and photovoltaic industry will be in the province Break through 110 billion yuan, become the new economic growth pole and important pillar production It makes Jiangxi an important silicon material and photovoltaic industry base in China Ground. Powdered quartz as the main raw material of silicon has been proved to be stored in Jiangxi Province Nearly 20 million tons, ranking first in the country. At present, the province in polysilicon casting Ingot and slicing are the key links in the chain of industry The forefront of the country, in addition to LDK in Xinyu.. LDK, Nanchang, Pingxiang, up Rao, Fuzhou is also around polysilicon, monocrystalline silicon, high-purity quartz powder and so on The industry is actively planning and the introduction of the project, including the Jinsha Jiang attracted investment, The entry of SMIC and other large companies. According to the plan, Jiangxi will actively seize the technological advantages and scale efficiency Advantages, integration of resources, optimization of allocation, and promote the rational distribution of industries Intensive development. Planning determines the six major developments of silicon materials and photovoltaic industry High purity silicon, polycrystalline silicon ingot, monocrystalline silicon and wafer, etc. Solar cells, silicon based thin film solar cells, and silicon materials and photovoltaic industry Related supporting industries. In the six major areas, Jiangxi will implement 24 Major projects, the total investment of 46 billion yuan. It is expected that by 2010, the province will be silicon The annual sales revenue of materials and photovoltaic industry will be more than 110 billion yuan. Metal powder materials and powder metallurgy technology Chongqing is included in the priority investment in high-tech projects In the Chongqing priority investment in the field of high tech guidelines, "metal powder" Materials and powder metallurgy technology are included, including ultra high temperature, High pressure inert gas atomization technology, ultrasonic vibration atomizing powder technology Advanced powder metallurgy, such as injection molding, warm compaction, spray forming, etc. Technology, a series of high performance powder metallurgy products, high strength and high conductivity copper based M ceramic dispersion reinforced composites, low cost contact materials. There are also related technologies and fields: Metal porous composite catalytic materials, including: purification of energy industry Metal catalytic filtration material for coal combustion flue gas and porous filtration catalytic material, Metal porous material surface pretreatment technology, carrier composite, catalyst activity Surface preparation technology of metal composite catalytic materials Preparation technology of catalytic filtration material, catalytic reaction membrane technology. "Special functional materials" include: superconducting materials, smart materials, work It can be used for ceramic, functional film, artificial crystal and other information materials, gas sensitive and wet Sixth phase of China powder industry in 2007 Forty