"Xianggong, I'm back!"

Lantian County, Yunshan Villa.

Han Yuxi pushed the door from the outside, saw Li Zexuan, who had just finished practicing swords in the front yard, and said with a smile.

"Why did the lady come back so quickly today?"

Li Zexuan took the handkerchief handed by Xiaohe, wiped the sweat on his forehead, and asked curiously.

Because Ye Fashan is trapped in the city, so recently, Han Yuxi went to the next courtyard early every morning to chat with Mrs. Ye, mainly because he was afraid that the old man would be too worried, and over time, he would get heart disease!

"Huh! Xianggong, didn't you ask knowingly? Yesterday, you told your grandmother that Guancheng County had been broken, and Fashan and they had also been relieved, and her grandmother and her old man were in an instant, so where did she need a concubine to comfort her? When the concubine had just gone, her grandmother had already gone out with her grandfather, and the maid who served them said that they had gone to the academy early in the morning! ”

Han Yu smiled and said.

It is said that after Ye Fashan got out of Guancheng County this time, he did not return to Beijing with the army, and after saying goodbye to Xiao Yuer, Tie Dan, Meng Wenhao, Liu Renliang and others, he set off to return to Nanyang, he planned to go home to say goodbye to his parents, and then went to the south to visit the famous mountains and rivers, visit the hermit masters, and pursue his own avenue!

As for the credit or something, he doesn't care at all!

Li Zexuan smiled and said: "Grandfather and grandmother are also in their old age, this kind of thing happened a while ago, and it really made them worry a lot, in the end, I didn't expect Fashan to accompany Xiaoyuer to manage the city together, this kid is kind-hearted, the Ye family is really a successor, in fact, grandfather, they should be happy for Fashan!" ”

Han Yuxi said curiously: "Xianggong attaches great importance to the goodness of the law? ”

Li Zexuan's current protégés also have hundreds, and she has never seen Li Zexuan value a person so much.

Li Zexuan said in his heart, the future leader of the world's Daomen, of course, he values it, but he can't say this kind of thing, after thinking about it, he said: "Fashan has very good qualifications, and his understanding is also very high, unlike other rich children, he is very able to endure hardships, such a person, it will be difficult to succeed in the future, so he said for his husband, the Ye family is a successor!" ”

Han Yuxi smiled and nodded, then her eyes rolled and said, "Xianggong, Tie Dan went out with the army this time, which can be regarded as a great help, do you think the saint will reward him?" ”

In the final analysis, this is my sister, after Tie Dan went to Guan Cheng, Han Yuxi was very worried every day, and now Tie Dan is about to return triumphantly, Han Yuxi, who is a sister, began to worry about whether his younger brother could get the reward he deserved!

Li Zexuan patted his wife's shoulder and replied, "Lady, don't worry!" Your Majesty has always rewarded and punished clearly, and the merits of Tie Dan are obvious to all, and Your Majesty will definitely not turn a blind eye. Actually, I don't want to see His Majesty give Tie Dan too heavy a reward, he is still young, if the reward is too heavy, I am afraid that he will lose the motivation to improve! ”

Han Yuxi said thoughtfully: "Hmm! Xianggong is reasonable! However, Tie Dan's credit this time is not big, and the concubine feels that he should only get some reward! ”

"Young Master, Young Master~!"

At this moment, outside the courtyard gate, Song Xiaosi's shout came.

Li Zexuan turned around and said, "What's the matter?" Come in and talk about it~! ”

Han Yu saw that Li Zexuan had something to do, so she went into the house first.

Song Xiaosi entered the courtyard gate, walked to Li Zexuan's side, bowed down and said: "Young master, the diversion canal next to the Bahe River has drained all the water in the Meicun River section, and the dam began to build the foundation today, do you want to go and see~!" ”

When Li Zexuan heard this, his spirit was shocked, and his face was full of joy: "Okay! You go first! I changed my clothes and arrived. ”

In the past half a month, with the joint efforts of him, Mohuai and Yan Shaoning, he has overcome many engineering problems in the process of dam construction, the most important of which is that Li Zexuan has solved the most critical problem in the reinforced concrete dam scheme - steelmaking!

Next to the ironworks of the workshop, a small steelworks appeared.

Ancient people did know how to make steel, and artificial training of steel appeared in China in the late Spring and Autumn period (before 476 BC). By the Eastern Han Dynasty, steelmaking technology had been mastered. The most commonly used is the frying steel and 100 steelmaking techniques.

The so-called frying steel is to heat the pig iron to melt or basically melt, stir it in the furnace, and use the oxygen in the air to carbonize the pig iron to obtain steel, and the steel made by this method is not of high quality.

As for the 100 steel, it is to repeatedly heat, fold and forge the block of iron, the purpose is to make the structure of the steel dense, the composition of the steel body more uniform, reduce impurities, and thus improve the quality of the steel, so the quality of the sword made of 100 steels is very high.

Although the quality of steel produced by Bailian Steel is high, this method has low output and high cost, which is difficult to meet the needs of industrial development.

The method adopted by Li Zexuan is the converter steelmaking method, which was invented by H. Bessemer in England in 1856, and the oxidant used in the process is oxygen. Air is blown into molten pig iron to oxidize impurities such as silicon and manganese. During the oxidation process, a large amount of heat is released (1% silicon can raise the temperature of pig iron by 200 degrees Celsius), which can bring a sufficiently high temperature in the furnace.

Converter steelmaking is carried out in a converter. The shape of the converter is like a pear, the inner wall has refractory bricks, and there are many small holes (air outlets) on the side of the furnace, and compressed air blows into the furnace from these small holes, which is also called a side blowing converter. At the beginning, the converter is at a level, liquid pig iron at 1300 degrees Celsius is injected inward, a certain amount of quicklime is added, and then air is blown in and the converter is turned to make it stand upright.

At this time, the surface of the liquid pig iron reacts violently, so that iron, silicon, manganese oxidation (FeO, SiO2, MnO) to form slag, using the convection of molten steel and slag, so that the reaction spreads throughout the furnace. After a few moments, when only a small amount of silicon and manganese remains, the carbon begins to oxidize, forming carbon monoxide (exothermics), which causes the molten steel to boil violently.

A huge flame appeared at the furnace mouth due to the combustion of spilled carbon monoxide. Finally, phosphorus also undergoes oxidation and further forms ferrous phosphate. Ferrous phosphate reacts with quicklime to form stable calcium phosphate and calcium sulfide, which together become slag.

When the phosphorus is gradually reduced by sulfur, the flame recedes, and the brown steam of ferric oxide appears at the mouth of the furnace, it indicates that the steel has been smelted.

The steel made by this method, both in terms of output and quality, is better than the frying method and the 100-for-100 steel method!

When he saw a large amount of high-quality steel smelted at the converter mouth, Mo Huai also called it incredible, you must know that their Mo family is not only good at engineering construction, but also good at steelmaking and sword casting, but it turned out that Li Zexuan, who is not from the Mo family, actually has such a steelmaking skill against the sky, Mo Huai can't help but be more convinced by Li Zexuan!

After solving the steelmaking process, Li Zexuan experimented with the mixing of steel bars and cement, and its strength was comparable to that of a boulder.

It is precisely because of these basic problems that the foundation of today's embankment is built.

Changing out of his practice clothes, Li Zexuan wore a white Confucian shirt and came to the bank of the Bahe River, and he could see the black workers on both sides of the river bank from a distance.

In order to catch up with the progress of the project, Li Zexuan used the tactics of crowds this time, like the construction of Yanhuang Academy last time, and recruited more than 10,000 craftsmen and people.

This is a typical lack of time, the number of people to make up, anyway, he has money!

"Mountain Chief, you're here~!"

Mo Huai's eyes were sharp, and after he found that Li Zexuan was coming, he hurriedly greeted him and said.

"Hmmm! Mr. Mo, I heard that the foundation of the dam is going to be built today, so I came over to take a look! ”

Li Zexuan smiled and looked at the Bahe River in front of him.

Due to the drainage canal next to it, the water of this section of the river has been drained, revealing the yellow riverbed, and the soft sediment on the surface of the riverbed has been dug up by craftsmen and people, and the foundation will be built from the dug up place for a while.

"After several months, we have finally passed the most difficult moment, who would have thought that we would be able to cut off the surging Bahe River in such a short period of time? Now we are not only cutting it off, but also building a dam about a few zhang wide from the middle, and from then on the moat will become a thoroughfare~! ”

Mo Huai laughed when he heard this: "In the final analysis, it is the mountain chief's plan that is appropriate, and besides, the mountain chief has invested so much manpower, material resources, and financial resources, if he can't get results as soon as possible, the old man will be incompetent~!" ”

Li Zexuan hurriedly said: "Why did Mr. Mo say this, during this time, you are the hardest worker!" When the dam is completed, you are the hero of the entire Lantian County, and all the people who are blessed by the dam will be grateful to you~! ”

"Hey, mountain chief, according to what you say, then I won't have to work hard~?"

While the two were talking, Yan Shaoning walked over from the side and half-jokingly.

He and Li Zexuan are very good friends, but since he is also on duty at Yanhuang Academy now, when there are people from the academy present, he usually calls Li Zexuan Chief, instead of calling him by name, this is called to save face for his friends!

Li Zexuan turned his head to look at Yan Shaoning and said, "Hehe! It's all hard! It's all hard! Hey, by the way, Shaoning, why didn't you see Miss Mo? ”

Yan Shaoning's eyebrows jumped, he almost vomited blood, a trace of honey embarrassment suddenly appeared on his face, and he said in his heart that he really can't open a pot of this bad friend, and Ren Mohuai is still in front of him, is it appropriate to mention someone's daughter now?

"Ahem! Why is she here? She should be in the workshop by this time! ”

was mentioned by Li Zexuan like this, Yan Shaoning no longer dared to face Mohuai as usual, as if there was a kind of nervousness and crampedness like a son-in-law seeing his father-in-law!

"Young Master, Mo Lao, the materials are ready, do you want to start building the foundation for the dam?"

At this moment, Fu Bo came over to relieve Yan Shaoning's embarrassment, and only listened to him.

"Hmmm! Let's go~! ”

Li Zexuan nodded with a smile.

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