When this was done, everyone couldn't help but look at each other, because they didn't know what to do next, "Wait, it'll be tomorrow." Huo Gang explained.

"General, is our task to burn this cement?" Sun Er asked with some confusion.

"Yes, but you still have to test it later, because it has different properties due to different material ratios." Huo Gang nodded.

"Now let's talk about steelmaking." Huo Gang did not continue on this issue, before cement did not show its strength, Sun Er and they were difficult to understand, but it happened that Huo Gang explained the problem of steelmaking to them.

"Does the general have the technology to make steel?" Lu Feng immediately asked in a somewhat hurried tone. As a blacksmith, Lu Feng has been helping here recently, everything here doesn't have much effect on him, the only thing he can do is to help Sun Er and them make some spare parts.

But they don't have a lot of iron, and any spare parts need to be melted down from their previous iron.

"Yes, the premise of making steel is iron, and I call it a blast furnace." Huo Gang nodded. In fact, many people have a misunderstanding, thinking that the blast furnace can directly make steel, but in fact it can't, the blast furnace can only make iron, and you must not be mistaken, the blast furnace cannot make steel.

"Blast furnace?" Lu Feng was stunned for a moment, "What the general said is the blast furnace that fired bronze in the Han Dynasty?" But it doesn't seem to work well. ”

Huo Gang: "??? ”

Lu Feng's words made Huo Gang a little confused, wasn't the blast furnace in the Han Dynasty? This...... Huo Gang suddenly didn't know what to say, how did he remember that he had read a novel in which the protagonist returned to the Ming Dynasty and took out the blast furnace of the domestic steelmaking period, and he was shocked by everyone?

Why is it that he is still in the Tang Dynasty, and someone knows about the blast furnace?

"You can draw a rough picture of the blast furnace you know, explain it, and I'll take a look." Huo Gang tried to calm himself and spoke.

Lu Feng didn't think much about it, but directly picked up a wooden stick on the ground and began to explain to Huo Gang while drawing.

The more Huo Gang listened, the more confused he became, this ...... The blast furnace was really exactly the same as the one he knew, although there were some slight differences in the details, but the principle was really exactly the same!

"General, that's basically it." Lu Feng quickly finished explaining to Huo Gang.

Huo Gang didn't know what to say, but after a pause, Huo Gang still spoke: "Yes, it's this blast furnace, but there are some differences in details, such as opening two blow-outs on the left and right in this position, which can make the air blow in more abundantly, and the larger the amount of air blown in, the faster it burns inside, and the higher the quality of ironmaking." ”

"Secondly, by adding two special gas outlets at the top here, you can design the high-temperature gas produced by blast furnace ironmaking to blow into the furnace again through two pipes, which can not only support combustion, but also increase the furnace temperature and save our fuel." Huo Gang pointed to the top again.

"But...... General, isn't the gas after burning poisonous? And it's exhaust gases that can't be burned again. Lu Feng scratched his head.

Huo Gang glanced at Lu Feng with a little surprise, maybe the ancients didn't know the composition of these gases, but they knew what the results of these gases were.

Lu Feng said that after combustion, there is no combustion exhaust gas, which should refer to a large amount of carbon dioxide, which is a large amount of products after ordinary air combustion, but there is actually no difference between the principle of modern blast furnace and ancient blast furnace, but the improvement is that charcoal is used in ancient times, while coking coal is used in modern times.

Huo Gang now knows the location of the open-pit coal mine, so it is not difficult for him to make coking coal, and the molten iron smelted by coking coal is of better quality and the furnace temperature will be higher, and the blast furnace gas produced by using coking coal contains a large amount of carbon monoxide that can be burned again, so it can naturally be re-blown into the furnace for use.

"Secondly, what are you going to use for fuel?" Huo Gang nodded, did not explain in detail, but continued to ask.

"Charcoal, ordinary flames can't melt iron ore to form molten iron, only charcoal and a well-sealed blast furnace can." Lu Feng immediately spoke.

"Without charcoal, I will find you a better burning material, which produces a higher temperature flame than charcoal, and can easily melt molten iron." Huo Gang said directly.

"Yes, my subordinates understand." Lu Feng nodded, he didn't ask, because they didn't understand what the general said, but they all knew the strength that Huo Gang had shown before.

Especially those tools, for these craftsmen, Huo Gang is really like a god.

When communicating with Lu Feng, the other craftsmen were listening to the side, and when the two of them finished speaking, Sun Er spoke directly: "If according to what you said, General, then in order to ensure the accurate collection of these exhaust gases, the top feeding port should go through some special treatment, and it is best that we need to make a hopper out of stainless steel, so that the part of the material should be avoided from entering the flue." ”

"The flue can be stacked with refractory bricks and sealed, and the outside can be used with an iron hoop to ensure its strength, which can be thickened, so as to ensure the temperature of the flue inside." Wang Luo, a mason next to him, also spoke.

"Blowouts, preferably with large blowers, animal power, or with our tower windmills." Lu Mu next to him also immediately added.

"It's a pity that we don't have a stream of water here, and if there is, we can drain it." Lu Mu said again with some pity.

"What is a drain?" When Huo Gang heard this, he immediately asked.

"Back to the general's words, the water row is a kind of hydraulic blower handed down in the south of the Central Plains during the Jianwu period, using the water flow to make a horizontal wheel, and then drive the blower, but the minister is ashamed, although the minister knows the general principle, but how to drive the blower in this horizontal wheel, the middle of this gear use minister does not understand." Lu Mu said with some shame.

Huo Gang: "......" Looking at these craftsmen, Huo Gang felt for the first time whether this modern person of his own was a fake modern person, because what they said was far beyond Huo Gang's understanding of them.

Got a hydro blower? And it was the Han Dynasty? Nima, this Han Dynasty is open. Huo Gang really couldn't help but want to complain at the moment, or was it that the Chinese were too smart?

"If there is no river...... We make a river. Huo Gang paused, and then said categorically.

Lu Mu: "??? ”

Lu Mu and the others all raised their heads and looked at Huo Gang with shocked faces, this ...... Rivers can also be made?

~~~~~~~~~

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