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What is the actual performance of Yongxiang’s 200-ton polysilicon production line?

2012-01-11View Original

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I read an article saying that Yongxiang’s 200-ton polysilicon production line is truly impressive. Are there any colleagues who know the truth about this? Please share your thoughts. The report reads as follows: On the early morning of December 1, 2007, the Yongxiang polysilicon construction site in Wutongqiao District, Leshan City, Sichuan Province was filled with noise. Here, Yongxiang Co., a subsidiary of Tongwei Group, has invested 100 million yuan to start the installation of equipment for a polysilicon production facility with an annual output of 200 tons. The designer of this project is Professor Dai Zizhong, a polysilicon expert from Beijing who is 70 years old.    At this moment, the veteran expert, wearing glasses and a safety helmet, is energetic as he walks back and forth on the construction site giving instructions.   Before December 16, 2006, Dai Zizhong and Liu Hanyuan had never met before; it was polysilicon that brought the two of them together. At that time, Liu Hanyuan had already decided to enter the polysilicon sector, but there was a shortage of talent in this field. So on that day, through an introduction, Liu Hanyuan met Dai Zizhong in Beijing.   “I had an injury to my waist at that time, and it looked pretty bad. ”The old man still remembers vividly his first meeting with Liu Hanyuan; Boss Liu \"truly valued talent\". He arranged another meeting the next day, and they had a pleasant conversation. Liu was sincere and earnestly invited Dai to come out of retirement. Soon, Dai arrived in Chengdu with his team as scheduled.    Almost at the same time, on December 25, Tongwei announced its intention to \"go all out in entering the polysilicon industry.\" ”    On this day, Professor Dai was busy directing the installation work at the construction site, while not far away, another project aimed at producing 800 tons of polysilicon per year with an investment of 550 million yuan was also in full swing. Most of the experts for this project come from Factory 739 (Emei Semiconductor Materials Factory); they are another group of talents brought in by Liu Hanyuan.   In fact, the polysilicon project that Tongwei submitted for approval is the largest of its kind in China, with a capacity of 10,000 tons. Initially, only 1,000 tons were to be produced on an experimental basis; but why was this amount of 1,000 tons further divided into two separate projects of 200 tons and 800 tons each?   It turns out that Dai Zizhong had his own original theory for polysilicon production, one that had not yet been put into practical use through formal production processes. This theory was very different from the globally adopted \"modified Siemens method,\" and it was claimed to produce no pollution. How is that possible? ! No one believed him, and he was even labeled as a “**” by his peers and relevant authorities.   But as soon as this stubborn old man saw Liu Hanyuan, he declared firmly: “My method can **reduce the cost of polysilicon without causing any pollution.” ”   This statement certainly coincides with Liu’s views—businessmen understand one thing: the lower the costs, the more profit can be made. In an industry where many players are competing in the polysilicon sector, lower costs are extremely attractive! Liu Hanyuan ultimately remained unmoved by the doubts and invited him. However, Dai’s method is contradictory to that of the 739 team, making it a dilemma as to which technique to use.   This is an investment project that will ultimately amount to 6.5 billion yuan, and no one wants to fail!   By February 2007, multiple devices had been finalized and the project was fully underway. The arrow is on the string; it must be released! Liu Hanyuan demanded that Yongxiang Polysilicon advance at lightning speed, and even offered 10 million yuan as a reward. What Liu Hanyuan wants is speed, speed!   By March, there was no time for further discussions, so a compromise was reached: Dai Zizhong would lead a team to use a new method for the 200-ton project, while another group of experts would use industry-standard methods for the 800-ton project. At the same time, Dai also signed an agreement with Tongwei, something akin to a binding commitment; in this agreement, Dai pledged to reduce the production cost of polysilicon to 50% of its current level!   What methods can be used to reduce costs? Liu said, “Replace the scarcity of resources with the infinity of technological progress”; technological progress naturally leads to lower costs.   By the end of February 2008, in just one year, the first phase of the project with a capacity of 200 tons was completed in terms of equipment installation and commissioning, setting the fastest pace in China’s polysilicon industry – whereas other companies typically took three to four years to achieve this. In March, Dai’s project entered official trial production. In July, the first batch of polycrystalline silicon samples produced on a trial basis were sent to authoritative institutions in the United States for testing.   Once the message about the sample submission was revealed, it immediately caused quite a ** in the industry. The industry is concerned that if relatively inexpensive new technologies can be used to replace existing ones on a large scale in the future, some high-cost, large-scale manufacturers will undoubtedly be the first to suffer as a result.   Soon, the test report came out. Polysilicon with a purity of over 6 nines can be used to cut silicon wafers for solar power generation, and the polysilicon produced by Dai Zizhong has a purity of more than 8 nines (99.999999%)! The technology has achieved multiple major breakthroughs, and its advanced nature as well as the high quality of the products have earned high praise from international peers!   It worked! And it’s produced at half the cost!   One can imagine the joy in the hearts of Liu and Dai at this moment, as well as the disappointment among countless peers in the industry. Liu and Dai have finally become the leaders of the entire industry; it can even be said that they can already see a promising future ahead. Appendix: Introduction to Boss Liu Liu Hanyuan was born in the small town of Meishan, Sichuan. He was regarded as a child prodigy; he completed primary school in just four and a half years and junior high school in two years. After that, he entered Sichuan Fisheries School, graduating at the age of 16 in 1981. Three years later, the method of raising fish in metal mesh tanks was invented, which instantly changed the difficult situation faced by Chinese people in terms of accessing fish. In 1986, he established a factory to produce fish feed; by 1987, at the age of 22, he already possessed a fortune of tens of millions, and by around 1990 his wealth had exceeded 100 million.
Reply #22012-01-11
Every factory, once it’s built and starts operating, claims to have set a world record in construction; its output is some absurdly high figure, but there’s really no innovation involved
Reply #32012-01-11
This post was last edited by bluetear2008 on 2012-1-11 09:13. It’s something from a few years ago; if it were really that good, then why didn’t anyone develop further technologies based on it?
Reply #42012-01-11
It seems that Yongxiang is still using the modified Siemens process at present
Reply #52012-01-12
One should adopt a cautious, skeptical attitude toward the authenticity of news reports. Regarding this purity testing, one thing that can serve as a reference is the fact that the silicon purity measurements for many new polysilicon production processes show large variations, with results being inconsistent from time to time.
Reply #62012-01-16
It’s very powerful; experience it for yourself: time: Is it really that good?
Reply #72012-01-16
Wow, when did this happen? It is estimated that those 200 tons of production capacity correspond to Yongxiang’s current testing line; the company’s current production capacity has already reached 4,000 tons, and the third phase with a capacity of 6,000 tons is currently under construction
Reply #82012-01-16
When was that? Is a production line of 200 tons still being produced?
Reply #92012-01-16
The two people upstairs have misunderstood; this is not a discussion about whether this amazing production line has been approved or not, but rather an exploration of this remarkable manufacturing process!
Reply #102012-01-18
The amazing craftsmanship – whether it’s truly amazing or not, only you can tell! ! !
Reply #112012-01-20
I heard that Yongxiang adds a small amount of silicon tetrachloride to the TCS fed into the reduction furnace. I’m curious about parameters such as power consumption, conversion rate, and the amount of silicon tetrachloride produced as a by-product. Does anyone who knows this information could share it?

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