Qin Feng and the others relied on the token to come all the way to Zuowei, and after showing the token, there was not much nonsense, and they directly took Zuowei and the others to return to Qinzhuang.

After returning to Qinzhuang, he arranged for Zuo Wei to camp near Qinzhuang, while Changsun Chong and Li Ke and a few others who had something to do returned to their respective places, leaving only Cheng Chumo, Qin Huaiyu and Li Zhen always following Qin Feng.

"Chu Mo, Huaiyu, building an iron plant needs an important fuel, and I need you to take someone to find it." As soon as Qin Feng entered the door, he said to Cheng Chumo and Qin Huaiyu.

"What's that?" Cheng Chumo asked at Qin Feng.

"Blackstone, also known as carbon, should be available in many places, you can ask some blacksmiths, they know the place!" Qin Feng said to the three of them.

"Okay, I'll take someone to find it tomorrow!" Cheng Chumo and Qin Huaiyu should arrive.

"Okay, you go to the left guard to select a thousand people to bring, I'm going to draw drawings now, I won't stay with you, the time is too tight." After Qin Feng finished speaking, he returned to his hut, he didn't expect Li Shimin to be so eager. But now that the decree has been issued, it is impossible to work hard, so I took out my mobile phone, began to search for the methods and drawings of iron-making, and began to copy.

On the second day, Cheng Chumo and Qin Huaiyu took people to look for the carbon that Qin Feng wanted all night, Li Zhen was sent by Qin Feng to transport iron ore, and Qin Feng got up early in the morning and took the remaining Zuowei to start building a steel mill.

Said that it is a steel mill, in fact, it is to build a small country workshop first, such a short time, there is no time to make it bigger, and it is not next to the mine, and it is very troublesome to transport ore back and forth, now it is to do a smaller practice experiment.

A small earthy blast furnace, the outside is made of bricks in the shape of a pot-bellied wine jar, and the inside is coated with a thick layer of burning-resistant clay, on which the opening of the ore is exposed, and there are a few blast vents in the middle, and at the bottom are two mouths, one is the mouth for the outflow of molten iron, and the other is the mouth for pulling the slag out.

It's simple and crude, and now there's no electricity, so you can only use this local method.

Three days later, the black-headed and black-faced Qin Huaiyu and Cheng Chumo transported back several large truckloads of carbon, and Li Zhen also transported back 20,000 catties of ore through Li Shimin. And Qin Feng and Zuo Wei have already completed the construction of the blast furnace early, and they can start practicing at any time.

Under the scorching sun, outside Qinzhuang, it was already surrounded by the left guard who stepped forward, prohibiting outsiders from entering and leaving. In Qinzhuang, there was billowing black smoke from the blast furnace, and one by one Qinzhuang households were found by Qin Feng to carry a load of ore and carbon from the blast furnace mouth, even if they were sweating, they did not stop.

And Qin Feng, holding a copper horn made by a blacksmith on the side, kept directing the work, and did not forget to cheer for the dealer by the way.

"Fengzi, no, the fire can't burn inside!" Cheng Chumo was shirtless, his body was covered with beads of sweat, and he hurriedly ran over from the blast furnace on the other side and shouted at Qin Feng.

"There's a bellows over there, and I'm going to find some people to blow the air in through the hole below. Be sure to get all the fire on the inside! Qin Feng shouted silently towards Cheng, and after shouting, he turned his head to Qin Huaiyu on the side and asked, "Huaiyu, have you pulled the lime I asked you to pull?" ”

"It's here, right there!" Qin Huaiyu pointed to a pair of limes on the side and replied to Qin Feng.

After all, it was the first time, and Qin Feng was not sure that it would be 100% successful, everything was searched from his mobile phone.

After more than an hour, the iron ore is melted at a high temperature, and some of the impurities and lime are fused to form a calcareous component, and the rest is connected with molten iron, mixed with slag, and slowly flows to the tap hole below.