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In the 21st century, the vigorous steel-making movement has become a thing of the past, and the earth blast furnace has become a ruin under the invasion of time and wind and sand, leaving only the ruins of the broken walls, telling the history of the past, and the Yizhou of the Tang Dynasty, the earth blast furnace has appeared again.

The matter of the Chamber of Commerce was handed over to Cui Yingying, who was familiar with it for a while, this girl quickly got started, she only managed the production and sales of goods, plus the daily income and expenses of the palace, these problems were not difficult problems for her, how to say that she had also studied for several years, and it was easier to accept this kind of challenging work than illiterate.

Withdrawn from the affairs of the Chamber of Commerce, Li Su is mixed with Tong Yu every day, Li Su reopened a vacant land in a dense forest more than ten miles away from the base of the Nanhe Workshop and erected a majestic building, but the scale of this building is much larger than the warehouse, the construction began years ago, and under the rush of thousands of workers day and night, it was finally completed in the first two days, and Tong Nian also brought all kinds of craftsmen to the research institute, and since then this is their home.

A high wall rises around the institute, leaving only a gate for the craftsmen to enter and exit, and at the door, a dozen heavily armed guards stand on either side, and the courtyard is constantly patrolled to ensure the "safety" of the craftsmen.

Yang Suxin's data collection work has been completed not long after the year, according to Li Su's requirements, these materials are basically equipped with detailed illustrative drawings, Li Su does not expect these Tang Dynasty people to be able to understand the professional terms, but hope that they will start with the most basic imitation, as for the principle and then slowly learn.

After the establishment of the research institute or the scientific research institute, Li Su had to participate in it, these technical information, for them may be a book of heaven, not incomprehensible at all, but Li Su is at least a person who graduated from the university after 16 years of education, and can still understand it more or less, and after Li Su told the technical information of ironmaking to the blacksmith of the research institute in the expression of the Tang Dynasty, Li Su completely became the object of worship of a group of pseudo-scientists in the Tang Dynasty.

After putting the technical materials into the library of the research institute, Li Yu gave Tong Yu four tasks, the first is steel, the second is the flint, the third is the steam engine, and the fourth is cement, and today, Tong Yu and the craftsmen finally built the earthen blast furnace under the guidance of Li Yu.

When Li Su rushed to the research institute, the first molten iron had just come out, standing in front of the earth blast furnace, Li Su was forced back a few steps by the heat wave, looking at the red molten iron, a stone in Li Su's heart finally landed, the ancients lacked wisdom or knowledge.

The earthen blast furnace in front of you is about three meters high, shaped like an inverted beer bottle, there is a hole at the top, which is used to pour iron ore, coal, coke and other raw materials into the blast furnace, and on the side of the blast furnace there is an earthen staircase for feeding, there are two circular holes under the blast furnace, one is used for air intake, one is used for molten iron, a bellows is installed in front of the air inlet, and a craftsman is pulling the bellows to heat the temperature of the blast furnace.

The earth blast furnace can only smelt high-quality iron, not that the steel is directly smelted, steelmaking also needs decarburization, dephosphorization and other steps to minimize the carbon and phosphorus elements in the iron, and this requires another follow-up facility.

"Well done!" Li Su said to Tong Yu and the craftsman in charge of the steelmaking project.

Li Su's four requirements are not carried out sequentially, but at the same time, he divided them into four groups according to the skills that each craftsman is familiar with, each team is responsible for different projects, and Tong Yu's group has a little bit of a small achievement, which is also due to the simple structure of the earth blast furnace, and the iron-making technology of the Tang Dynasty is already good, and the steel filling method has been very popular in the north, but Li Su requires more excellent quality steel, at least enough to produce steam engines.

Tong Yu was slightly proud, these days he has been immersed in the information provided by Li Su every day, and whenever he didn't understand something, he ran to the palace to ask Li Su, and now he also understands a lot of the terms of steel smelting, and said: "Your Highness, after the molten iron is smelted, you only need to add another steelmaking furnace on the side of the earth blast furnace, so that you can produce high-quality steel, but it's a pity that the raw materials of the earth blast furnace still lack limestone, otherwise the iron smelted by the earth blast furnace can be compared with the steel of the Tang Dynasty today." ”

"Don't be so greedy, take your time, now that Steward Jin has taken someone to find this mineral, it is estimated that there will be news soon, not only you, the main raw material for burning cement is also limestone, that best friend of yours is probably more anxious than you!" Li Su quipped, Li Su said that which of Tong Yu's best friends is called Du Pingzhi, as his name suggests, and Tong Yu has no pursuits, only likes to delve into strange things, after receiving Tong Yu's letter, this master dragged his family to Yizhou, and he is now the person in charge of cement and steam engines.

Originally, Li Su asked him to be responsible for firing cement, but cement is too simple to make zuò, as long as there are raw materials, it is not very difficult to produce it, read the information, and discuss the manufacturing method of cement with Li Su, Du Pingzhi felt that he was overkill, and begged Li Su to hand over the matter of the steam engine to him.

"Your Highness......" When Li Su and Tong Yu were talking about steel, a sloppy-looking person slipped in, shouted and ran over, really saying Cao Cao Cao Cao arrived.

Compared with Tong Nian, Li Su thinks that Du Pingzhi is more like a mad scientist, he dresses out of tune, and he is naïve and childish in dealing with people, except for drilling in the house to study materials, he has no other hobbies.

"Your Highness, when will there be news of this limestone!" Du Pingzhi almost asked this question when he saw Li Su, and this time was no exception.

Tong Yu hurriedly said: "What's urging, Your Highness is also in a hurry, it's not you who need limestone, I also need steelmaking." He was always unkind to this dear friend.

"Let's not mention this yet, do you have an eyebrow for a steam engine?" Li Su turned his head and asked.

Du Pingzhi immediately became depressed, "Your Highness, limestone is needed to burn cement, and steel is needed to make a steam engine, and now I don't have the same, and I can't do it." The biggest place in the research institute is not the library, nor is it the living area of the craftsman, but the real yàn area, the courtyard where Li Yu and Tong Yu are standing now is Tong Yu's test ground, and there is an indoor real yàn room for Tong Yu to do research on the north side of the test site, and Du Pingzhi also has his own craftsman and real yàn room, these days he is actually looking at drawings and materials, and his hands have long been itchy.

Li Yu thought about it for a while, and said: "Don't worry, the steam engine and the furnace for making steel will arrive in a few days, and then you will study these things well in combination with the real thing, especially Tong Yu, whether you can make good steel will affect the production of many things, your task is the heaviest, you know?" ”

Tong Yu said: "Yes, Your Highness, Tong Yu remembers." ”

Li Su looked at the two of them and twisted his brows, the research institute has just been established, and there are still a lot of things missing, such as a lot of practical tools, such as pliers, screwdrivers and the like, without these things, they can't disassemble these modern machinery at all, and the way he is taking now is to copy and innovate, first let them copy those old technologies, make them first, and master the principle in the system.