Just after worshiping his ancestors, Li Yu breathed a sigh of relief, and Li Chun's shouts came from outside the door.

"Young Master, a minister from the court came to our house to visit you."

When Li Yu heard Li Chun's shouting, he felt very strange. He never contacted the ministers in the court. Who would come to visit him? He walked out of the house with confusion.

I saw that the visitor was a middle-aged man in his forties, of medium figure, majestic appearance, wearing a court uniform, and looking at his yard.

"Mr. Li! Congratulations on being named Marquis now." When the middle-aged man saw Li Yu coming out of the room, he immediately bowed his hand with a generous look on his face and congratulated him.

Li Yu didn't know this person, so he bowed his hand and looked at him in confusion, saying, "Have you asked your name yet?"

"Samurai Shin-Yuan, Minister of Works." Samurai Shin-Yuan, opened his mouth and introduced himself.

Warrior Ji generously claimed his name and looked at Li Yu again. Warrior Ji found that he was completely different from the rumored scholar. He looked like a scholarly dressed as a scholar, and he did not have the scholarly aura he should have. He stood straight, like a sharp sword hidden in a sheath. The sharp sword seemed to be able to be sheathed in an instant and killed people invisibly. What's even more strange is that the pressure he brought to himself was even greater than that of the current emperor.

After looking at Li Yu, Samurai Ji felt vaguely in his heart that this was an amazing person because he had seen all kinds of heroes in troubled times. His sect did not have the indescribable temperament and he had the heart to make friends in his heart.

"Samurai! How could it be him?" Li Yu was shocked when he heard that the samurai Ji had registered his family. He didn't expect that the samurai Ji would come to visit him?

Wu Shishi is Wu Zetian's father! I don't know if Wu Zetian was born now? I will find an opportunity in the future to see what the first female emperor in China looked like when she was a child.

"Are you Duke Ying? Hello! Hello!" Li Yu heard that he was Wu Zetian's father, and hurriedly said hello to the warrior.

"Hahahaha~, I have heard that Mr. Li is so talented that Wu has long wanted to visit him, but he is afraid of disturbing him. But he can't come today! He has to bite the bullet and disturb him." Wu Shiji laughed happily when he heard Li Yu's strange greeting method, and he had the heart to make friends with Li Yu.

"My talent is average, the third in the universe." Li Yu said with a smile. He didn't know what modesty is.

Unlike people in this era, sometimes they have to be humble for a long time even though they clearly know that what they say is correct.

"Hahaha... Why is your speech so strange, but I just like to listen." After hearing Li Yu's words, the warrior laughed boldly again.

"But what do you mean by Marquis, the third universe?" The warrior had never heard of these strange words, which made him very confused.

"So that! Look at the earth, moon, sun, Venus, Jupiter we live in...all belong to part of the universe, and...."

Warrior was fooled by Li Yu's theory of universe, and finally stood up and said, "I finally know. Why did the prince ask me to come to you to solve the problem of coking? It turns out that you know the place outside of our living place!"

After the warrior Ji was surprised, he had not forgotten what he had come here for today, so he quickly said, "Marty Li, let's not discuss the matter of the universe for the time being, let's talk about the issue of coking. This is my difficult problem now."

After hearing this, Li Yu came to ask for advice on coking. Zou Zou browed and asked, "How to refine coking? Don't you understand it yet? Haven't I explained how to refine coking a lot?"

"Hey! The Ministry of Works was quite chaotic in the past, and no one had ever led the way to solve the coking problem. I have just joined the Ministry of Works, but the Ministry of Works is not easy to manage now. There are several ministers below who are eyeing me as the Minister of the Secretariat. They only have no political achievements after I took charge of the Ministry of Works, and they have some lack of prestige, so I want to open up the way from coking, otherwise I am the Minister of Works, which is really difficult to do." In the end, Samurai said, and also complained to Li Yu.

After hearing the warrior Ji's bitterness, Li Yu understood that he was here to ask about the problem of coking today, and had no hidden plans, so he told the warrior Ji about how to coking.

"So that's the case? In fact, iron smelting is not just about using any fuel. For example, charcoal can make excellent steel. However, if the iron ore is smelted with undesulfurized coal, it may only make brittle and hard waste, which is simply useless."

Warrior Ji immediately continued, "Mr. Li, what you said is simply right. The steel you made with the coal you mentioned is indeed too crisp and useless. The prince said you know how to get out something in the coal, so I came to ask for advice today."

"The main coal comes from the underground, and the coal contains a large amount of other substances, and the main component is sulfur. When the iron ore is burned, sulfur will enter the melted iron. It is precisely because of the existence of sulfur that the steel becomes extremely brittle. To solve this problem, the substance sulfur in the coal must be removed! Only coking can desulfurize."

To put it bluntly, coking technology is similar to burning charcoal. It is to isolate the air when the fuel is halfway through combustion, causing a series of changes in the properties of coal, namely desulfurization technology.

Li Yu carefully explained to Samurai how to coke and how to remove the sulfur in coke as much as possible. That kind of coal is suitable for coke.

Li Yu knew that Shanxi had the best coal quality in later generations, and coking enterprises were also the largest coking enterprises in the country, but he was not very clear about how to get these coals out.

"Duke Ying Guo, after coal is refined into coke, the combustion temperature of coke will increase again, and the time for smelting ore will be reduced accordingly. However, the coking technology must be controlled well. Otherwise, the desulfurization technology will not be up to standard, which will cause major losses. Don't be caught by the officials in the court in the end and use it to attack you." Li Yu finally reminded the warrior.

Warrior Ji is an lonely minister in history books. It is said that he has few friends in his life, but he is loyal to Li Yuan. According to historical records, after Li Yuan died of illness, Warrior Ji died of heartache and grief after hearing the news.

After hearing his reminder, Samurai Ji sighed and said, "Thank you for the reminder of Marquis Li. Alas! Actually, I understand this. Using coke to refine ores can speed up the iron crafts. With more steel, people can use steel equipment one day earlier, and they can't take care of so many things for the time being. It's still important for people's livelihood!"

It seems that Samurai Ji is also a patient person, unlike the evaluations of later generations of people who say he is a wise man.

Warrior is good at talking. He comes from a family of merchants and is very familiar with the customs and folk customs of all over the world. Li Yu's knowledge is far beyond those of the people of this era, so he is very good at chatting with Warrior.

"Duke Ying, you are in your mansion, how many young masters and daughters are now?" Li Yu couldn't help asking. He mainly wanted to inquire whether Wu Meiniang was born.

"Two sons, two daughters, and the younger daughter is only a few months old." Wu Shiteng didn't hide anything. He directly told Li Yu the answer he wanted to know.

Afterwards, Samurai Ji happily talked about how naughty his two sons were and how smart his two daughters were...

Wu Shitao originally had a wife and gave birth to three sons for him. After only surrendering to Li Yuan from Wu Shijiji, he had not returned home for several years because of busy military affairs. His wife and one of the sons died of illness one after another. He did not know that his son and wife had died of illness. It took him a long time to learn that after Li Yuan learned about this, he sympathized with Wu Shijiji and married him. Wu Shiji and Yang gave birth to two daughters after marriage.

Warrior was shocked by Li Yu's omniscience, and the two became more and more speculative. Finally, Warrior invited Li Yu to have more contact when he had time, and Li Yu agreed readily.

Before leaving, Li Yu also vaguely told the warrior not to put the eggs in a basket, otherwise it would be troublesome to beat them in the future.

However, Li Jiancheng is too strong now, and most of the court officials in the court are not optimistic about Li Er, so Wu Shishi did not take Li Yu's reminder to heart.

Li Yu looked at the back of the warrior, knowing that he was about to be unlucky. It was the fourth year of Wude. In the ninth year of Wude, Li Er would launch the Xuanwu Gate incident. Li Yuan was unlucky and was under house arrest by his son. As the loyalty of Li Yuan and Li Jiancheng, the fate of the warrior has been decided.

Li Yu could not change the idea of ​​history for the sake of a warrior to see Wu Zetian when he was a child.

(On the first update, I wish my friends a happy Sunday, remember to vote!)
Chapter completed!