Actual amount of silicon tetrachloride produced in polysilicon manufacturing
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In my thermodynamic calculations for polysilicon production using Siemens’ process, theoretical calculations show that the higher the hydrogen feed ratio, the less silicon tetrachloride is produced; increasing the hydrogen ratio actually results in a decrease in silicon output. At 1273 K, theoretically about 8 tons of silicon tetrachloride are generated per ton of polysilicon produced (this does not include the silicon tetrachloride produced during the process of converting silicon powder into trichlorosilane). International reports suggest that the optimal amount of silicon tetrachloride produced can be around 8 to 10 tons. I would like to hear from those who are familiar with it: how much silicon tetrachloride do China’s leading manufacturers produce per ton of polysilicon? Additionally, I would appreciate it if the experts at Haichuan could help me check whether my thermodynamics calculations are correct.
Once the large domestic companies achieve a closed-loop system, who knows what the actual production volume of silicon tetrachloride is........... Almost no one tells the truth; haha. I’m not sure how you did your calculations – could you share your brief calculation process? Our laboratory has also conducted calculations before; based on what you’ve described, our results should be similar. However, your post isn’t very clear... What does the statement \"Theoretically, producing one ton of polysilicon results in around 8 tons of polysilicon (excluding silicon tetrachloride generated during the production of trichlorosilane from silicon dust)\\" mean?
2# Minos said it refers to the amount of silicon tetrachloride produced during the reduction process. Throughout the entire production process, when silicon powder is used to produce trichlorosilane, silicon tetrachloride is also generated. It should be over 50% in the domestic market
Can such a post still get points? ? ? It’s unfair! ! ! ! I really can’t understand it. . . . . Be careful when it comes to motivating people to post and assessing the quality of posts! ! !
If the process is not closed-loop, then based on the current average standards in China, the amount of silicon tetrachloride produced in a single production cycle, including the synthesis stage, should be around 15–18... Of course, when making public statements, no one would obviously mention this figure
It’s just wealth that’s added, not prestige or charm – is there any reason to get so upset? ?
Do you feel justified in having amassed such wealth? ? ? Why should I be excited? ? ? Don’t you think it’s too superficial? ? ? ? The forum is not a chat room; please avoid random and inappropriate discussions, and respect everyone on the forum. . . . . . . .
At 1273 K, the interior of the reduction furnace is an environment in which the thermal decomposition reaction of trichlorosilane dominates, with the reduction reaction playing a secondary role. In such a situation, there is no theoretical basis for determining the relative weights of these reactions; therefore, it is inaccurate to use theoretical calculations to predict the actual production results. In actual production, it is necessary to adjust the operating parameters of the reduction furnace in order to achieve a high conversion rate, minimal by-products, and energy savings. The TET produced through reduction is then converted into TCS in a hydrogenation furnace. By-products of TET refer to those that cannot be hydrogenated (including silicon tetrachloride generated during the production of trichlorosilane from silicon powder); the best performance rates achieved in China at present are 3-5. Of course, there are many companies with very high values as well (over 10)! It can’t be said that foreign companies operate on a 1:8 ratio; the main reason is the difference in technology, as their by-products are used to produce other products within a closed-loop system, such as in companies like Degussa
From all your question marks and exclamation marks, I can only see your excitement – that’s all. Keep a calm mindset; an unsettled state of mind will only harm you, with no impact on anyone else. The more posts you make, the more points you’ll earn
Just laugh it off. . . . Hahahahahahahaha
This post was last edited by Minos on 2009-7-27 at 16:16. Hehe, one can tell what kind of mindset you have from the way you speak, and from that mindset it’s possible to determine what level you’re at. I don’t want to say much more to you. BTW, I hope you’re really laughing, and not just pretending