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Polysilicon, an important source of information in the production of solar cells and semiconductor devices. Around 2004, when the global photovoltaic industry was in its early stages, photovoltaic polycrystalline silicon materials were once the bottlenecks that contracted the development of my country’s photovoltaic manufacturing industry. What strict technical seals have China’s polysilicon production experienced? How can domestic enterprises achieve breakthroughs until they reach the world’s leading position?
Jiuqin joined the Chixin Group in March 2003. In 2007, he came from the Shanghai headquarters of the group to the Jiangsu Xuzhou Polysilicon Production Base in Jianzhong. He stayed for 7 years. He witnessed the entire process of Chixin entering the photovoltaic industry and laying out the production of polysilicon based data. In his eyes, Chixin and even Chinese photovoltaic enterprises’ polysilicon production path is exactly the shrinking of the entire Chinese photovoltaic industry from weak to strong.
“I want to visit someone else’s factory, but the other party directly returned to it, but there was no door.”
Around 2004-2005, the global photovoltaic market began to “explode”, and some companies in China have made some efforts in component production through this trend.
Although domestic component manufacturers can already follow the global market, the most painful problem is that data is subject to restrictions. Sugar daddyThe so-called “two heads out” means that the demand for important original material polysilicon has entered the foreign market. The demand for produced component products is exported to foreign markets. Chinese photovoltaic companies only play the role of OEM processing.
There are only a handful of companies that can produce polysilicon materials in the world, and the production volume is also very unlimited. And at that time, the semiconductor industry had a mature market, and photovoltaics were a new pioneer. Therefore, silicon material manufacturers must be the first to guarantee the demand of semiconductor companies before they could reach photovoltaics.
Photovoltaic companies can only remove polysilicon materials from semiconductor companies. At that time, the annual output of polysilicon materials in the world was about 30,000 tons, and there were only 10,000 tons that could be supplied to photovoltaic enterprises. The polysilicon materials used in the semiconductor industry are more pure and have higher cost than photovoltaic polysilicon, but the domestic Manila escortThe old polysilicon production companies have long-term supply agreements with semiconductor companies. Even if the market price of photovoltaic polysilicon materials has reached 300 to 400 US dollars, and if the semiconductor polysilicon materials are only 50 US dollars, they will not stop supplying semiconductor companies. The long-term contracts of the two are often stable.
At that time, Ji Xin was moving into the photovoltaic industry and saw the pain of China’s photovoltaic manufacturing focal data being controlled by people.
In fact, as early as the fifties and sixties of the previous century, China began to discuss semiconductors, and some polycrystalline silicon production companies were excited. By the end of the 1970s, there were fifteen or sixteen polycrystalline silicon production companies in Shanghai, Chongqing, Sichuan, Jiangxi and other places, but the key production technology has always been under control in Germany, american, japan (Japan) and other countries, and it is impossible to achieve any breakthrough.
If domestic enterprises want to produce polycrystalline silicon materials, they must break through key technologies. Although I have such knowledge, I realized how strict the technology blocking in foreign countries is, and there is no technical transportation channel.
The production process of polycrystalline silicon materials has four important steps: the first step is to produce the raw material trichlorohydrin; the second step is to use trichlorohydrin silicon. daddy is pure; the third step is to restore the pure trichlorohydrin to the boiler to obtain pure polysilicon; the last step is also the most important part. During the restoration process, a large number of tail gases including silicon tetrachloride will be generated. The tail gases need to be transformed into trichlorohydrin and then applied in a circular manner. This is the most difficult step and the key to our technical breakthrough. Only when the cycle of silicon tetrachloride to trichlorohydrin is realized can a large scale and low-cost polysilicon production be realized.
Germany WACKER was the world’s leading polysilicon manufacturer at that time. It has been an industrial manufacturer of ultra-pure polysilicon since 1959. Wacker in Jiangsu ZhangjiagangWe invested in an organic silicon factory. We communicated to the parent company through business channels, hoping to visit the German polysilicon factory where we visited. The other party directly returned, but there was no door. Since then, our engineers applied the opportunity to travel to Germany. In a small town, the factory is surrounded by large areas of tree forest vegetation. The most basic area cannot enter that area, let alone visit, and you can’t see anything.
“The biggest harvest was to buy the redeemergence furnace. At most, we knew what this was, and then we had the domestic equipment behind it.”
Although the visit and transportation were not profitable, we found a private enterprise in the local area that supplies equipment support for WACKER Factory.
This company is important to produce the reduction furnace of reduced trichlorohydrogen silicon, and the production volume is not large. The boss is called Thietha, who is over 70 years old and can drink wine. The 53-degree platform is made of red feathers. I will have a few cups of boiling pots, but I still have a good time. Xie Sna’s important factory produces 12 pairs of rod restoration furnaces, which is suitable for 1,000-level production lines. At that time, a group of people from China jointly launched more than a dozen projects.
We bought the reclaimed boiler from the factory in Xiesna. The fourth hour of 2007 summary 1: Xin built the first 1500-ton/year polysilicon production line in Xuzhou, Jiangsu, and used these boilers.
In fact, whether domestically or internationally, the upgrade of the equipment must be based on the factory’s production exploration, and technological improvements are also digested in the equipment. It’s like replacing the boiler. When purchasing, the equipment manufacturers will supply leaves such as pressure and temperature control stones to the Internet. They are hurt and powerless. The basic technical parameters of the same cycle will definitely be exposed to the optimization of parameters during the equipment operation process, which is related to the changes and upgrades of the equipment. For example, the installation will be upgraded only when the factory continuously optimizes production. Later, when the second 1500-year production was invested in 2008, domestic enterprises could already produce and restore the Sugar daddy boilers. At that time, we had already begun to shrink from 12 pairs to 18-to-be, 24-to-be, 36-to-be, the equipment layout is different after the shrinkage, and our technical staff and nationals are not allowed to leave the seat. “Official enterprises have calculated from the beginning, but we can already do it.
I think now that I can find the most important thing in Germany to buy the redeemergence furnace. At most, I know what it is, and then I have the domestic equipment behind it, and of course some equipment from japan (Japan) and american.
Now, whether it is Jiangsu or Xinjiang’s factory, the domestic equipment production rate has exceeded 95%, which is more than 30% lower than imported equipment purchase, subsequent operation and maintenance costs of domestic equipment.
“The leading enterprises in the industry have always observed China’s polysilicon production. They believe that China has been trying since the 1960s and 1970s. They have never made any profits and are sure to be unable to do it, but we just made a profit. We did it.”
Technical breakthroughs did not suddenly change at any point, but were slowly realized through bit by bit.
In fact, when the first Xuzhou production line was launched in 2007, the most important process, silicon tetrachloride was converted to trichlorohydrin and did not completely break down. The hydrological treatment process was conducted in a synchronous study and trial. Therefore, many of the craftsmanship trials at that time were also tested online on the first line. From this perspective, the first line of 1,500 tons/year was also affected by the experiment at a certain level. Since there is no ready-made craft bag and it is not profitable to go out and pick up, we can only study and search for it myself. Although the research and discussion, which began in the fifty years of the previous century, did not have serious technical breakthroughs, it has accumulated professional talents in the department. At that time, in order to break through this most important circle, domestic engineers in chemical, semiconductor, electronics, power and other industries, as well as chemical design institutes and equipment manufacturing companies, were involved. Later, engineers from the domestic fine chemical industr TC:
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