After proving that the coking kiln can make coking, Hong Tao handed over Hu Eryi a stack of drawings and prepared to enter the smelting and casting industry.

Therefore, Hu Er's performance today is very disappointing to him, himself, his son, his grandson, and his great-grandson are enough to each share a craft, but at the critical moment, he still sacrifices his righteousness to take care of the small family.

What is it called? This is called rotten wood can not be carved! What to do? It's easy to do, go and touch a big potter to fight with the Hu family, and teach your own craft to the two families together, I'll let you get it!

However, this matter cannot be done by Zhu Bajin, it is best for him to stand on a neutral position and be purely a manager, and whoever is justified will face whomever he wants. In this way, you can do something out of it.

But for now, Hu Er's family still has to use it, and this stack of drawings is the detailed construction drawing of the earthen blast furnace. This kind of blast furnace did not exist in later generations, it is a semi-modern blast furnace that was developed by the craftsmen of the Jinhe Empire after decades of exploration by absorbing Hong Tao's principles about the blast furnace of later generations, combined with the conditions at that time.

The efficiency is certainly much lower than that of later blast furnaces, and the fuel consumption is also larger, but the furnace temperature is stable and the tap quality is higher than that of the blast furnaces of the early twentieth century. By controlling the raw materials and furnace temperature, casting-grade white iron and gray iron can be directly obtained, and 1.5 tons of iron can be produced every day and night. With the use of open-hearth furnace, it can also directly make steel from molten iron.

In fact, it was originally designed for steelmaking, so a heating chamber had to be built next to it, which was equivalent to a small coke oven, and the hot gas produced by coking was used to preheat the blast furnace and open hearth to effectively increase the furnace temperature.

There are advantages and disadvantages, the disadvantage is that the structure is a bit complicated, especially the hot gas passage and blast system between the heating chamber, the blast furnace and the open hearth. In the absence of qualified cast iron pipes, all of them must be built with refractory round tiles, which is very demanding and almost impossible.

As for whether Hu Er's craftsmanship can meet his own requirements, Hong Tao has no score in his heart, try it, it really doesn't work, it's a big deal, remove the heating chamber, don't consider the matter of open-hearth steelmaking first, play the gray iron well and then move forward step by step. Fortunately, this time I have time, unlike the Jinhe Empire, which had an urgent demand for steel at that time, and it doesn't matter if it takes more than ten years.

In fact, even if the stove is built, it will not be possible to mass-produce too many qualified steel for a while, because there is no one. The smelting industry can only be regarded as a small half of the completion of equipment alone, and a sufficient number of qualified workers and engineers and strict processes are the other half of the more important factors.

From the time the ore is transported to the steel mill, it has to go through several processes such as grading, crushing, primary separation, and enrichment. China has not been a source of iron-rich ore since ancient times, and it cannot be said that if you can't find alkaline iron-rich ore with an iron content of about 70%, you won't make iron.

How to beneficiate, how to rely on a simple way to determine whether it is an acidic ore or an alkaline ore, whether the sulfur content is high or low, how long the roasting time is used to remove the excessive sulfur content, how much solvent to add to adjust the slag rate, etc., are the key to whether or not to smelt qualified pig iron.

Although it is not necessary to control the content of various elements as accurately as in later generations, it is good to be able to smelt pig iron without going through several months of actual operation, let alone steelmaking.

Can you find an apprentice with this kind of talent, Hong Tao has no spectrum in his heart, he is a mouth peddler, all kinds of parameters, indicators, and appearances are all right, but don't play practical. Let him go to do it one by one in person than kill him, and whether he can finish it at all is a question.

"But the big officials want to make iron?" When Hu Er saw that the colt was back, he thought that he was still struggling with what had just happened, so he hurried up without waiting for the pony to open his mouth.

He hasn't been idle for a few months, and every time he's with the pony, he's pondering his temperament. There is no big gain, but one thing can be touched. The colt likes to talk about practical things, and as long as there is a topic on technical issues, he usually doesn't dwell on other minor issues.

"I didn't expect you to be so versatile, when did you help someone build an iron-making furnace? What do you think of this furnace? As Hu Er thought, the horse didn't say anything, took the drawings and began to talk about dry goods.

"The villain has an in-law family in the Daimyo's Mansion, I went there when my daughter got married, and his family was a blacksmith in the previous dynasty, and he never left the furnace in his life. The villain has seen an iron-making furnace in his house, and it is incomparable to the furnace of the big official, just like the villain's ugly girl and the little lady of Lian'er. Seeing that he could escape the catastrophe, Hu Er's mouth was like smearing honey, and he did not hesitate to let out his daughter's appearance.

"I can't imagine that you are still a person with both children, what a blessing. Do you want your in-laws to learn the same craft as you to eat and drink for eternity? His family is developed, and your family is more stable. ”

Hong Tao's mind was on the earthen blast furnace and qualified craftsmen, and he didn't pay attention to Hu Er's expression, and his flattering nonsense was automatically filtered.

It would be much easier to train a blacksmith who lacked scientific knowledge rather than experience. Knowledge is easy to learn, but experience is hard to cultivate.

"Since he has made it, being able to learn the craftsmanship of a big official is the virtue of his family for several lifetimes, and if he dares to say half a word, I will take the girl home!" Hu Er almost broke his ribs when he heard that there was really a good thing, so he hurriedly took the errand for his in-laws, for fear of cheapening others.

"That's good, I'll let Bajin send someone to send you to the Daimyo's Mansion, you go home first and say hello and leave in the afternoon." Hong Tao is now a radish that is fast and does not wash the mud, someone is better than no one. It would be best if Hu Er's in-laws could build a blast furnace together, which would be of great help to him understand his intentions in the future.

“…… How about the villain gone here? It's better to let my second boy go on a trip, he is going to school in Biyong, and it will be okay to take a few days off. ”

Don't look at it as looking for a job for his own family, but once something hinders his family, Hu Er can immediately distinguish who is far away and who is close, and he is very unhappy to leave the construction site, for fear that others will rob him of his position as a master craftsman.

"Isn't there your ugly family, I'll teach him personally, go back to Hugh quickly!" Hong Tao can be regarded as serving this old man, if his grandfather is a calf protector, he is a calf protector, and the grade is one level higher.

Hu Er was reluctant to give up, and followed Zhu Bajin's apprentice step by step. Hong Tao temporarily took his place and became the commander-in-chief on the construction site, and began to arrange work with Hu Er's son Ugly.

In fact, Ah Chou understands much more than his father, and his memory is good, as long as he doesn't let him express too many things, he can use it several times better than Hu Erneat.

At this time, it shows the advantage of making coke first and then playing with the blast furnace, refractory bricks and green bricks are ready-made, and they can be used as soon as they are used, and there is no need to take refractory soil and mud to make do.

With the coking kiln, it is also convenient to burn bricks and tiles, no longer need to build a brick kiln alone, make a good mud and cover the coking kiln, and after 12 days, thousands of bricks and tiles will be fully formed, and the quality is quite good, much higher than the starting point of the Jinhe Empire.

"Sealed, sealed, no, no, breathable...... Two layers, bite ...... Bit, bite, bite......" When Hong Tao focused on the airtight ventilation between the three furnaces, Ah Chou suddenly became excited, pointing to the tile cylinders on the drawings, and almost didn't bite Hong Tao's nose off.

"Bite your daddy! If you can't speak, talk less, take a stroke! Hong Tao understood that he wanted to express that there was a way to seal it, but he didn't have the patience to listen to him keep biting, and waved his hand behind him, and Lian'er handed over the small notebook and brush.

"Can you burn such a special-shaped tube?" Ah Chou is really an inner show, and his speech is only stronger than that of a dumb person, but after picking up the pen, he is sublimated to a drawing technician, and he can express his inner thoughts clearly with a few casual sketches, at least Hong Tao feels that he understands.

The two ends of the tube he drew are divided into male and female, with two protrusions on the outside of one end and corresponding grooves on the inside of the female end. When using, the two pipes are docked, and the male is inserted into the female tube and rotated half an inch, and the two pipes are stuck.

As long as the quartz material is filled in the interface, the two tubes will be glued together by the melted quartz material after high temperature calcination, even if there is an air leak, it doesn't matter, and then fill the quartz material.

This thing can not only achieve the purpose of sealing, but also easy to access, and the cost is very low. Quartz is a filtered sand that can not only seal the air duct, but also be used to fire glass later.

The only flaw is that if a piece of pipe is broken, it has to be replaced, because each section of pipe is welded to form a whole and cannot be separated.

But this is not a problem, the pipes fired with refractory materials are strong and thick, and they will not break easily. Besides, dolomite is only worth a few dollars, and it is much more reliable to burn a little more to prepare than the male head of those pottery chimneys that you get directly into the mother tube.

It's just that this thing requires very fine billet making technology, and the gap between the male head and the female tube should not be too large, and it also takes into account the shrinkage rate of the clay during firing, which is easy to look at and difficult to do.

"Five...... Five, five ......" Ah Ugly stretched out his slap, his five fingers spread, and he didn't understand what it meant.

"Do you want to say that you are only 50% sure?" Lian'er is a quick temper and kind-hearted, so she really can't stand it and plans to say it for Ugly.

"Yes......" Ah Ugly is like seeing a fairy, and he smiles so sweetly.

"It doesn't matter if it's two, the dolomite is not afraid of burning, and if it is broken, it can be used again, just try. Don't learn from your father, he's too stingy and short-sighted. No matter what a man does, he must have a certain mind, and if his vision is small, he can only stand still if he learns no matter how much he learns. You don't have to worry about the things here, take someone to burn the pipe first, I'll remember you a lot if you succeed, it doesn't matter if you fail, let's think about other ways when the time comes! ”

Hong Tao's heart is also sweet, that sentence is not wrong, the wisdom of the people is unlimited, and he can't find a better solution after thinking about it for a long time, so he can easily do it.