It is a scene caused by the rapid expansion of the gas in the furnace when heated, and the combustion impurities are rushed out of the furnace along with it.

The flames faded after dozens of breaths, replaced by sparks that splashed from time to time—that is, molten iron.

Due to the mixed composition and cavitation of these iron products, when melted, the gas in these voids will open up like an explosion, and at the same time carry a large amount of molten iron.

Every eruption of the furnace mouth causes a commotion on the scene.

The scene in front of them was something they had never seen before.

In the past, it was difficult to raise the furnace temperature above 1,300 degrees, resulting in the pig iron melting slowly and not being able to liquefy completely, and the molten iron flowing out was as viscous as magma. The flying sparks are proof of the complete dissolution of the iron ingots—after more than 1,500 degrees, they are heavier "water" that can splash like water droplets with a little disturbance.

Ning Wanjun looked at Mo Yun after a moment of amazement, "Didn't anyone think of using the separation technique to smelt before?"

"How could it not be. Mo Yun replied, "However, none of the basic techniques of the Separation Technique can take effect for a long time, such as the Flying Flower Flame, not to mention the need for nitrate powder for the medicine induction, and it can only create a flowing fire once, and even burning a piece of wood cannot guarantee ignition, let alone gold and iron." As for those who are good at using the separation technique, they may be able to burn continuously, but they will not do this kind of thing themselves. ”

"So the most important thing is the listener spell?"

"No...... The most important thing is people. Speaking of this, Mo Yun glanced at Xia Fan imperceptibly.

To be honest, when the other party came to her at night and said the idea, her first reaction was to be surprised. He was surprised that Luo Qing would cooperate with Xia Fan so much and reveal the details of his technique, and he was also surprised that the first thing Xia Fan thought of after testing the characteristics was to use it in steel smelting.

Needless to say, the former is self-explanatory, most of the alchemists will regard their magic experience as a top-secret thing, and they will not easily pass it on if they don't have enough benefits, it is obvious that Luo Qing has a lot of trust in Xia Fan to some extent, and the latter is completely Xia Fan's very different way of thinking - in other words, it is difficult for her to counterintuitively associate such a powerful ability of the listener with the furnace.

However, now that I think about it, this is the way a researcher should think of it.

She still has a lot to learn.

Ning Wanjun suddenly pulled Mo Yun to the side and walked a few steps to the side, and asked in a low voice, "I heard Xia Fan say that he talked to you all night that day?"

"Uh, this ......" Mo Yun was a little stuck for a while, "Your Highness, I'm not ......"

"No, that's good. The princess shook her head.

"Huh?"

"He's the only one who can technically talk to you all night, right?" she smiled slightly, "Don't you realize that when you talk to other people, every sentence is very short? In addition to not wanting to involve you, I also had concerns about this - after all, I can't make up for what you are good at and like. ”

"Your Highness......" Mo Yun couldn't help but be a little moved.

"The way you directed them to stack the ingots and organize the tests was more energetic than any other time, as if there was a light in your eyes. I'm glad to see you like that, as a friend. The princess calmly grabbed her hand and said, "Do what you want to do, so that I won't regret leaving you in Jinxia City." ”

......

Xia Fan didn't notice the conversation between the two, he was paying attention to Luo Qingqing's state, "How do you feel?"

"It's a little bigger than just controlling a dragon scale, but I don't think it's too much of a strain. Luo lightly felt the qi in his body and replied, "It shouldn't be a problem to persist like this for an hour or two." ”

It seems that the potential of Qi in terms of energy transformation is indeed enormous.

In a way, the power of a alchemist is stronger than that of a steam locomotive, but the two have not been transformed before.

Considering the specific manifestations of the spell, this is probably the lowest statement.

"The position of the sword began to sink. Luo reminded softly and suddenly.

This means that the upper layer of pig iron has almost melted, and the flowing molten iron is filling every gap between the wrought iron below.

For this experiment, he collected almost all the raw materials in the arsenal of Jinxia City and the blacksmith shops in the city. According to the method of the Ministry of Industry, if you want to smelt these iron ingots into steel, it will take hundreds of people to be busy for a month or two in a row, but now it is only two quarters of an hour, and the first and most difficult step of the process has been fully achieved.

The next step is to mix the molten iron with the wrought iron as much as possible, and if quality is the case, the smelter usually uses a huge tongs to grip the wrought iron sheet and roll it repeatedly in the molten iron to make the contact more comprehensive. This is essentially a helpless approach under the restriction of furnace temperature, Xia Fan obviously has no such concerns, relying on the dragon scales to further heat, melting the wrought iron with a melting point of more than 1,500 degrees, both of which are turned into molten iron, which is naturally the best mixture.

This is the second step, and it is also a step ahead of the times.

It means fast and efficient production is possible.

After another quarter of an hour, Luo gently signaled that the blade would not sink again, and there was no doubt that the liquid level in the furnace had reached its lowest point.

Xia Fan nodded at Mo Yun and said, "It's time." ”

The latter took two steps forward and ordered loudly, "Prepare to open the furnace!"

"Yes!

Under the pull of more than a dozen people, the hemp rope dragged the heavy furnace door out little by little—its length and width were less than ten inches, but the longitudinal distance was more than an arm's length, like a plug blocking the leak.

The moment it was pulled out, orange-red molten iron gushed out instantly!

Under the tremendous pressure, even the ten-inch-long bottom hole made this scorching red flame rush out seven or eight paces away.

Someone in the crowd had already begun to cheer.

Regardless of the end result, the liquid flowing down the trench already means that the ingot has completed a new melt.

"Prepare for molding! Don't let molten iron spill into the ground!"

"Yes!"

At the other end of the trench, the soldiers had placed a large number of stone molds side by side at the sloping opening.

This harvesting process will continue for quite some time.

Xia Fan went directly to the mold area with Mo Yun, the princess and others.

The blacksmith who had been waiting here for a long time skillfully selected a stone mold with a wide and flat shape, picked up the reddish iron bar from it, and threw it into a bucket prepared in advance. When the water vapor cleared, he fished out the bar, placed it on the felt, and began to beat it with a hammer - soon the bar was knocked out of a nearly ninety-degree angle.

Then he picked up another handful of steel drills and slammed them against the iron sheet several times until a silver-white gap appeared on its surface.

After completing these two tests, the blacksmith excitedly reported to the princess, "Your Highness, the grass people dare to guarantee with twenty years of experience that the iron produced by this furnace is indeed steel!"