What happened in Ezhou City on the ninth day of the lunar month naturally spread to Huangzhou in less than half a day, but Huang Dalang got the news a few hours late.

Speaking of which, when he opened the Sun family's ironware workshop, he saw that the craftsmen of the Sun family used good red copper to make copper kettles, so he asked why he didn't use iron to make them, and the blacksmith of the Sun family said a lot about the fact that copper is easy to smelt and shape, and iron is not easy to smelt and shape.

But the problem is that this technical difficulty is not a problem at all for Huang Dalang, who has black technology.

The production of copper kettles is mainly divided into three parts, the first is the refining of copper, the source of copper is mainly official, after all, copper parts are still indispensable in the construction of houses and many daily necessities. In the early Northern Song Dynasty, because of the almost full copper content, some people also obtained copper by melting copper coins.

After the copper material is selected, it is rough pouring, and the corresponding parts are welded with copper juice, which is the second step, and the third step is grinding and trimming. In the Song Dynasty, the strongest manufacturing process of bronze was not the Great Song Dynasty, but the Western Xia, the cold forging armor worn by the Iron Harrier and Bubazi of the Western Xia Qiangjun, and the original source of the process was the cold forging copper.

Although the Song Dynasty repeatedly legislated to strictly prohibit the flow of copper and copper materials to the Western Xia, the cold-forging copper technology of the Western Xia greatly increased the added value of copper metal products, so it could not stop the profit-seeking nature of the merchants.

Therefore, the problem that Huang Dalang wants to solve is only two parts, the first part is to improve the smelting furnace, and the second part is to melt the iron liquid, and the link of forging and grinding is also studied.

Because it is melting iron juice and not steelmaking, the smelting black technology provided by Huang Dalang is also simple, that is, the charcoal inverted flame furnace with a graphite crucible.

The principle of the charcoal inverted flame furnace is very simple, but Huang Dalang can't tell the difference, so he can only restore it according to the style in the dream. Of course, it should be explained here that Huang Dalang has done many similar strange dreams, among which the most impressive one is that he is a yellow-haired and blue-eyed foreigner, who made stone axes with his bare hands, cut wood to build houses, and made stoves and earth kilns to burn bricks and tiles, and even built a kind of fire dragon in the house that he had never seen before.

The main body of the inverted flame furnace restored by Huang Dalang is a cylindrical furnace body with a diameter of one zhang, and the furnace body is divided into three layers, namely the fuel room, the heat storage room and the heat storage room, and is equipped with a large manpower bucket operated by 12 people. The working principle is to use the air bucket to blow the air from the middle heat storage chamber into the furnace, through the air duct into the lower combustion chamber, the charcoal in the combustion chamber produces flames through the fire channel directly into the upper layer of the thermal storage chamber, and uses the suction force of the fire baffle and chimney to make the flame directly act on the graphite crucible in the thermal storage chamber.

When the stove was on fire, and as Huang Dalang described, the pig iron in the graphite dry pot was turned into iron juice as easily as Huang Dalang described, and the three old craftsmen almost knelt down and called Grandpa Huang Dalang.

Although this matter of refining iron into juice is not a legend for the blacksmiths of the Song Dynasty, it is also similar to the peerless secret skill of establishing a life. This was so because people didn't know how to measure temperature at the time.

At that time, the process of iron refining was roughly to first burn the block of iron ore mixed with charcoal and charcoal in a large forging furnace, dissolve the iron atoms in the iron ore at a temperature of about 900~1000 degrees to form sponge iron, and then take out the sponge iron and heat it to form a block of pig iron, and then heat it with pig iron and repeatedly stack it to discharge impurities and then plastic the former.

Under normal circumstances, there is only one chance to turn iron into molten iron, and that is when refining ore, once a lump of pig iron is formed, it can be burned soft at most, and it is no longer possible to turn it into molten iron.

Therefore, the blacksmiths of the past dynasties have hit the idea of this only chance to make juice, and the steel frying method in the middle and late Western Han Dynasty and the steel filling method in the Ming and Qing dynasties came into being.

In the Great Song Dynasty, copper and iron were monopolized by the imperial court, and the iron ore was uniformly supervised by the craftsmen of the imperial court for rough processing, and the use of the steel frying method was optimized, and the good quality pig iron material was left by the imperial court to build weapons and equipment for the army, and the poor quality was sold to the people through the iron bar, so that the common people could be made into kitchen knives and plowshares to maintain the people's livelihood.

Therefore, the black technology inverted flame furnace that Huang Dalang took out, how awesome it is can be imagined: if you can turn pig iron into molten iron, doesn't it mean that you can fry steel twice?

It's just that the only request given by Huang Dalang for the stove is to ask them to study the casting of iron kettles, which is too sad.

However, with the inverted flame furnace, the blacksmith of the Sun family beat some of the scrapped wrought iron into extremely thin iron sheets while frying steel for the second time, and then beat the iron sheets into assemblies, and finally welded them with tin, and the iron kettle was also made.

Later, Huang Dalang felt that the cork plug was easy to fall off and leak, and gave the black technology of the thread mouth, and the sheepskin used directly for the washer part was naturally surprisingly good.

However, it was said that around the second watch on the evening of the ninth day of the lunar month, Huang Dalang led Wan Chunnu and Leng Zhi Lucalyx to make more than a dozen warm baby coats in Wan Chunnu's room, and when the iron kettle was filled with hot water and was testing, Zhu Gao hurriedly came to report and said what happened in Ezhou in the morning.

When Huang Dalang was surprised that all things were coincidental, his cousin Yao Yu, who had not been bothered for a long time, ran like crazy, and grabbed Huang Dalang when he entered the door and said, "Cousin! Hurry up and save Daddy, there are many officials with knives in the house, and they want to ask Daddy for their crimes. ”

As soon as he heard this, Huang Dalang was naturally shocked, and said in his heart, Could it be that the matter of the Heavenly Dao Alliance has been revealed?

When he gave Zhu Gao a look, he comforted: "Cousin, don't worry, do you know what's going on?" ”

Yao Yu's face turned pale, and he shook his head and said, "I don't know, Aunt Qiu asked her to report to her cousin." ”

Huang Dalang was puzzled for a while, so he also gave Wan Chunnu a look, so he pulled up Yao Yu and said, "Let's go, let's go see what is going on first." ”

When I went out and came to the side door of the side courtyard, I saw that Zhu Gao, Zhang He, Sun Li and Lei Bao had arrived, and they were all dressed up in full arms. ”

Then the three of them went to Yao's house through the side door, and when they came to the front yard, they saw that there were twenty or thirty more soldiers in the courtyard holding torches and wearing the uniform of the Great Song Dynasty, and two people wearing the clothes of the Yellow Gate pressed their uncle Yao Zheng and cousin Yao Rong to kneel on the ground, and the bun on the uncle's head was also scattered, and even blood flowed from the corners of his mouth.

At this time, I heard a middle-aged man in purple clothes in the courtyard, and shouted coldly in a sharp voice: "Yao Zheng, our family will say it again one last time, if you don't sacrifice the canned meat making method to the prime minister, it will be equivalent to collaborating with the enemy and plotting against you." This is a catastrophe of destroying the family, you can afford this position of the lord, but you can afford the life of the entire Yao clan? ”

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I'm sorry, I hurt my hand today, and I'm busy with some chores and just went home, so I'll make up for it tomorrow!