After leaving the silane factory, Ling Shizhe and the others did not go back to the company directly, but went directly to the silane decomposition factory.

This is the last key process of silane thermal decomposition to prepare high-purity polysilicon, the silane plant through a special stainless steel pipeline, the silane is sent to the decomposition furnace in the silane decomposition plant, the temperature in the decomposition furnace is exactly the decomposition temperature of the silane, between 850-900 degrees Celsius, in this temperature range, the silane is decomposed and deposited into high-purity polysilicon and high-purity hydrogen, hydrogen is undoubtedly to be pumped away for cooling and recycling.

Silane and hydrogen are both flammable and explosive gases, and the temperature of the decomposition furnace is as high as nearly 1,000 degrees Celsius, so it goes without saying that this last step of silane decomposition is the most dangerous process in the polysilicon production process.

The whole adsorption system and the decomposition chamber must have a high degree of tightness, and the air must be completely isolated, otherwise a little air entering the high-temperature decomposition furnace will cause the danger of explosion and combustion.

This is also the reason why Ling Shizhe insists that the silane plant and the decomposition plant must be separated, which is completely considered from the perspective of production safety.

After introducing the whole process technology of silane decomposition to make polysilicon, you will definitely ask, why is this silane so dangerous, why is it still the safest production method? The answer lies in the fact that the trichlorosilane reduction method for preparing high-purity silicon invented by Siemens is more dangerous than the method of silane thermal decomposition to prepare high-purity silicon.

The method of preparing high-purity silicon from trichlorosilane invented by Siemens not only requires a large amount of flammable and explosive high-purity hydrogen in the production process, but also requires a large amount of high-purity hydrogen, and it is a highly toxic substance, and people will be poisoned if they inhale a little.

In addition to these two things, hydrogen chloride should be prepared, and the production of hydrogen chloride is generated by the combustion of hydrogen and **, the production process of hydrogen chloride alone is quite dangerous, hydrogen chloride is still a highly corrosive gas, and water will generate hydrochloric acid; Whether it's gas or acid, a person's skin can ulcerate even if it is touched next to each other.

There is also trichlorosilane, like silane, it is also a flammable and explosive gas, it will smoke violently in the air, and more importantly, its ignition point is only 28 degrees Celsius, it is volatile, easy to vaporize, and its vapor is weakly toxic and harmful to the human body.

Moreover, in the process of reduction, trichlorosilane will produce a large number of toxic products, such as: hydrogen chloride, hydrogen, silicon tetrachloride, etc.; Compared with silanes, which only produce hydrogen, which is an accessory, the by-products of trichlorosilane can pollute high-purity silicon and affect the purity of silicon.

Through the above comparisons, we can fully see that the production method of silane thermal decomposition to prepare high-purity silicon is much safer and more reliable than the Siemens method in terms of safety.

The person in charge of the silane decomposition plant is a subordinate of Wang Bingkun, who is standing by the decomposition furnace with Ling Shizhe. This large decomposition furnace is a high-frequency induction plasma silane decomposition furnace that has been widely used in later generations. It includes a calciner cylinder, a high-frequency plasma lamp, an induction coil and a high-frequency induction distribution box; Among them, the high-frequency plasma lamp is contained in the decomposition furnace cylinder, which is connected with the high-frequency induction distribution box through the cooling sealing assembly, and the high-frequency plasma lamp is used to heat the silane gas to make high-purity silicon, which has the advantage of avoiding the direct contact between the high-temperature gas and the metal, reducing the pollution, and greatly improving the purity of polysilicon.

An eight-minute thick stainless steel pipe is connected to the decomposition furnace, and Li Yaowen explained to Ling Shizhe: "Ling Shao, this pipeline is the transportation pipeline of silane, and this pipeline is connected to the decomposition furnace, and the silane enters the decomposition furnace from here, and is decomposed and deposited into polysilicon. In order to ensure the completeness of the silane during the pipeline transportation to the greatest extent, we also add hydrogen to dilute the concentration of the silane before the silane is transported through the pipeline, so as to avoid the risk of explosion and combustion due to friction and heat during the pipeline transportation. ”

Ling Shizhe frowned when he heard this, and said to Li Yaowen: "Before the silane pipeline is transported, hydrogenation dilutes the silane concentration, who taught you to do this?" ”

Li Yaowen's heart tightened, and he said weakly: "It was requested by Director Wang, saying that this can ensure safety to the greatest extent." ”

"You go and inform Wang Bingkun and call him over." After finishing speaking, Ling Shizhe ignored Li Yaowen, who was standing on the side in a daze, and walked directly into the duty lounge with Christopher and Wang Haihua.

Seeing that Ling Shizhe didn't have any expression on his face, Li Yaowen didn't know whether it was a blessing or a curse, so he hurriedly returned to his own office and called Wang Bingkun.

After waiting for ten minutes, Wang Bingkun ran over with a sweaty steamed bun, and came to the duty room to see Ling Shizhe sitting on the duty chair looking at the 24-hour duty operation record of the decomposition furnace copied by the employees every hour, and there were three workers on duty standing next to him, and he didn't dare to come out, Christopher sat next to Ling Shizhe, Wang Haihua looked at the safety operation procedures on the wall with great interest, Li Yaowen stood opposite Ling Shizhe, nodded and kept wiping his sweat.

Seeing Li Yaowen's appearance, he chuckled in his heart, it was broken, and he walked up to Li Yaowen and opened his mouth and scolded: "Li Yaowen, didn't I tell you, the duty operation record must be filled in carefully, sloppy, why don't you listen, and you ......"

"Hmm......" Ling Shizhe interrupted him and said, "Who said there was a problem with their on-duty operation records?" ”

"Ah...... So Ling Shao, are you? Wang Bingkun looked at Ling Shizhe puzzled and asked.

"They did a good job of keeping records on duty, and I didn't criticize them to praise them."

"Don't dare, don't dare Ling Shao, this is what they should do, if they can't even make a record, then what's the use of them, just go home and pick up the child." Hearing that Ling Shizhe was not criticizing, but affirming their factory, Wang Bingkun breathed a sigh of relief.

Ling Shizhe closed the duty operation record and asked, "I heard Li Yaowen say that before the silane was transported in the pipeline, in order to ensure safety, you added hydrogen to the silane to dilute the concentration, right?" ”

"yes, I think it's safer that way." Wang Bingkun replied.

Ling Shizhe shook his head and said: "There is no need to add hydrogen, cylinder transportation only needs hydrogen gas to dilute the concentration to ensure the safety of transportation, pipeline transportation is not required, and such a little distance has no impact on silane, just withdraw the hydrogen and directly transport it at a high concentration." Also, the decomposition plant and the silane factory should not be separated, and they should be in one factory, just ensure that the preparation and decomposition areas of silane are placed at both ends of the factory. ”

Wang Bingkun looked at Christopher, who raised his hand and said, "BOSS, I arranged it this way, I think it's safer." ”

Ling Shizhe shook his head and said: "In this way, it is not safe, silane preparation and silane decomposition are not a good choice to make two factories, it seems that it is safe to separate them, but in fact, it has no effect at all, no matter which factory explodes, the other factory will not be spared, the distance between the two factories is too close." If the two factories are merged from the beginning to prepare, purify and decompose in one stop, there is no need to add any hydrogen to the pipeline to dilute the concentration of silane to ensure the safety of transportation. ”

Christopher covered his face and said remorsefully: "I'm sorry boss, I messed up, when I saw the information you gave, I thought you were going to separate them, all I ......"

"There's nothing wrong with separating, they should have been separated, but I didn't let you divide them into two factories, forget it, it's a trivial matter" Ling Shizhe patted Christopher on the shoulder, pointed to the map on the wall and said: "Our company's demand for monocrystalline silicon is very large, and the polysilicon factory will definitely be expanded, you can put the decomposition workshop here, put the silane plant here and there, and simply divide this area into it, as the future polysilicon production base, what do you think." ”

Christopher looked at the map and said to Ling Shizhe: "Very good plan, BOSS." I will go to the most professional design company to do detailed planning to make up for my mistakes. ”

"Your question isn't wrong, it's wrong." Ling Shizhe will not blame him, the silane thermal decomposition to prepare high-purity silicon method only appeared in the new century, Ling Shizhe should bring it to this era, people face this completely unfamiliar technology, it is inevitable that such and such mistakes will occur, which no one can avoid, as long as there are no serious design defects and production safety accidents, Ling Shizhe allows them to make some mistakes. It is unrealistic not to make any mistakes, and it is impossible to grow.

"The employees of the decomposition plant are doing well, according to the example of the silane plant, three months' salary as a reward, and they will have a big meal in Jufu Building today and tomorrow, okay, I'm leaving."

On the way back, Ling Shizhe's car went to the other side and went directly to Zhao Xiaoyun's house.

Ling Shizhe took off his coat, Zhao Xiaoyun reached out and took it, hung it on the hanger, made him another cup of tea, and said, "What do you want to eat tonight?" I'll do it for you. ”

"No need, the employees of the factory have dinner in the evening, my past." At that moment, Ling Shizhe said about rewarding employees today.

Hearing that Ling Shizhe was going out to eat dinner, Zhao Xiaoyun's mood became bad all of a sudden, and she asked after a while, "Then will you come over after dinner?" ”

"I'll be staying here for the next few days, so come with me at night."

"Well...... when she heard that Ling Shizhe was going to take her to the dinner, she immediately became happy again, snuggled into Ling Shizhe's arms and said, "By the way, I heard that the second brother is going to sell the theater, do you know about it?" ”

"Selling theaters, how can he sell theaters? Isn't his theater running well, why did he suddenly want to sell it, and when did it happen? ”

"A week ago."

"What is the reason for selling, whether it is Hong Kong, Malaysia, or the Philippines?"

"It's all sold, I heard that there is no source to put in the film, and I am losing money every day, and I have lasted for almost a year, and I plan to sell it if I can't hold it anymore."

Ling Shizhe got up and said, "Hasn't he been following the Shaw Brothers film, how can there be no film source, didn't the Shaw Brothers give it to him, why?" ”

Zhao Xiaoyun sighed and said, "Do you remember "Big Brother Tangshan" released last year? ”