Things are almost discussed, there are some details that Liu Feng needs to think about before making a decision, and now there is some time, Liu Feng plans to go to see the weapons factory in Kurut and Lin Zhi's shipyard.

Liu Feng and his entourage were going to the armory factory first, this place was a little far away from the palace, Liu Feng and a few people rode horses, and they heard the sound of clanging iron in the distance, as well as bursts of green smoke rising in the air, it seemed that this armory factory was still quite busy.

After entering for a long time, I saw that the fat man Kurut was at this time, licking his belly with a straw bale, wandering around in front of many workstations, occasionally pointing. The last time I came, this guy was still busy, and it seems that the workers he recruited are already skilled, and he only needs a little mention from Kurut.

Seeing Liu Feng coming, he hurriedly walked a few steps and came over to say hello. Kurut was grateful and admired to Liu Feng, and always felt that this person had countless thoughts and ideas in his head.

"Marshal Liu, you're here, what new things do you have to do this time?" Kurut looked at Liu Feng with expectant eyes.

"Alas, what I want to do, you can't do it for the time being." Liu Feng's face was full of regret, and he pretended to sigh.

"Marshal Liu, don't be kidding, I'm the best blacksmith in this city, even in the entire Rongri Kingdom, I can definitely shoot the number, you can tell me, see if I can do it."

"2,000 long weapons, made of Uzi steel, 50,000 rings, made of steel, can it work?"

Kurut's eyes widened, his mouth was half open, and then he looked around and said, "Marshal, you are playing tricks on me, not to mention that there are not enough ores, numbers, and tools, even if they are enough, we have to rely on the sky to eat, and the monsoon cannot be controlled, so many weapons, I am afraid that it will not be able to be put out in ten years." ”

"You're right", Liu Feng nodded, "What if I can solve your heat problem?" ”

"Then it's no problem, as long as you have money, buy enough ore, and add me some people, what you said, it's about the same in half a year."

"What I want is your words, Uzi steel is rare for the time being, I will arrange for someone to buy it, but not so fast, but the problem of fuel, I will teach you."

For Uzi steel, Liu Feng knows very well, this is a special iron ore refining, this kind of iron ore has been exhausted in Liu Feng's time, but at present, the quantity is very large, but unfortunately, it is not in North Tianzhu, but on the Deccan Plateau in South Tianzhu.

When you have the money, arrange for caravans to infiltrate south and bring back iron ore, or simply build an iron factory there and make steel ingots to ship back. This is a later plan, and for now, I can only buy it as much as possible. There is no breakthrough in high-temperature technology, relying on charcoal and monsoons to help, the output is limited and expensive.

Liu Feng said to Kurut, "There is a black, slightly smelly thing, buried in the ground, called coal, which can be burned, and the flame temperature is very high. ”

"Oh? So how do you find it? ”

"Those who have a pulse of charcoal depend on their mountains and stones, and if they count stones, they will do it, but bluestone and sand and gravel will not." After Liu Feng finished speaking, Kurut scratched his head, his big eyes turned white, and he looked confused.

"If you don't understand, take a small notebook and write it down", Liu Feng explained carefully:

"If you want to find coal, you have to learn to observe the rocks on the mountain, if there is shale, it means that there may be coal underneath, you can dig it down, if the mountain is full of limestone, sand, don't look for it, absolutely nothing.

There are two points that must be paid attention to, when mining, one should pay attention to the water below, to avoid the water layer, in addition, must be mainly open to ventilate, the coal seam is poisonous. It is best to drill a coal well and a gas well, and the two sides are interconnected to ensure safety. If you are not at ease, you can throw down a live chicken for experimentation. ”

Kurut wrote it down densely, and everyone was full of admiration.

Guo Jia asked, "Crazy, the coal you are talking about, we have had it in the Central Plains for a long time, but it has never been used to make iron." On the same day, the prime minister also did a test, using coal to make iron, the temperature was enough, but the iron was fragile, so it was discarded. Is there something you haven't seen through yet? ”

Guo Jia's crepe words, in fact, understand the meaning, in short, "You are not fooling this fat man, right?" ”

Liu Feng understood it, and naturally knew the truth. The heart said, although I am not an honest person, I never fool good people. Hurriedly explained:

"This coal is only the first step, and coal really can't be used to make iron, precisely because of the smell in it, which affects the hardness of iron." Liu Feng definitely can't teach chemistry class, and if he does, no one will be able to understand it.

Liu Feng was originally a sports student, and his grades were indeed average, but this iron-smelting and steel-making is basic chemical knowledge. Coal contains a lot of sulfur, so it has a foul smell. When making steel, coal is mostly used as auxiliary fuel, otherwise sulfur is mixed in, and the natural quality of refining is very poor.

The solution is very simple, during the Spring and Autumn Period and the Warring States Period, the Central Plains had already mastered the method, but it had not been promoted. Liu Feng continued to popularize science and said to Guo Jia:

"Fengxiao, you are right, but coal is only the first step, and it must be baked into charcoal before it can be used to make iron." After saying that, he called Kurut, who was confused, and commanded:

"Fatty, take a small notebook and memorize it carefully. Dig as much coal as possible, pay attention to the two I said, and don't have any accidents. Do you build some of these stoves? ”

Liu Feng took the fat man's pen, sketched it on the paper, then returned the pen to the fat man, and continued to explain, "Put an exhaust hole, fill it with crushed coal, and roast it with firewood or coal fire below until there is no white gas discharged from the pores." Then, pour some cold water to accelerate the cooling, and the pieces inside are coke. ”

"Does the smell disappear after roasting like this?" Guo Jia can see through it at all.

Liu Feng replied, "Exactly. ”

"Brother Madman, where did you know all these weird ways? It's also a set, which sounds like fun! "Asila is very curious. Her question actually aroused everyone's curiosity. Liu Feng had no choice but to rely on the ruins mentioned in the book to explain.

"In my hometown, Murakami, this method has been used to make coke for many years, but it is too remote and has not been used to make iron and weapons, so everyone has never known about it."

This is actually a half-truth, the Central Plains coke refining history is indeed very long, but it is used to make steel, but it is hundreds of years later, I have to say, it is a pity.

"Marshal Liu really never disappoints", Kurut's face was full of red light, and he was extremely excited, "as long as the fuel problem is solved, the ring head knife you said will be fine." By the way, Marshal, what do you mean by the ring-headed knife? But the head of the knife has a ring? ”

Liu Feng looked at Guo Jia, when the Han soldiers were in their hands, they had left nightmares for the countries of the Western Regions, and Guo Jia naturally knew about it. Guo Jiayi will, took the pen, and drew the appearance of the ring head knife on the paper, indicating the size.