Of course, the newly made clay cannot be fired directly. After it is made, it is placed there and waits to dry in the sun.

During this process, Han Cheng and Heiwa rebuilt the stove using yellow mud and pottery clay.

The scale is about the same as before.

After stacking them, let them dry in the sun for a day, then light a fire inside to make them dry faster.

The special pottery jar used for smelting copper was also placed next to the fire to speed up the process, otherwise it would take too long to dry naturally.

Eight days later, the two newly manufactured items were finally finished.

After placing the pottery jar on the stove and connecting the two, the Qingque tribe's copper smelting project began again.

Han Cheng walked up the stone steps and stopped when his waist was level with the furnace mouth. He tilted the jar in his arms and slowly poured the mineral powder inside into the vat.

He put a lot in this time and put six cans in a row before stopping.

There is no need to worry about the mineral powder flowing out of the hole at the bottom, because it has been blocked from the inside with ceramic plates before doing this.

After the mineral powder was poured in, the flame began to burn, the wind whirred, and the scorching heat gathered here, passing through the bottom of the ceramic jar, transferring the heat into it and influencing the mineral powder.

This process was a bit long, and after a long time, the mineral powder inside finally began to melt slowly.

As for it all melting, that will happen a long time later.

Han Cheng climbed up the stairs again, tilted his head back, and squinted at the hot ** inside.

The air was rising at a very high temperature, making it somewhat unbearable.

"Get out of the way!"

After taking a look, Han Cheng turned around and shouted to the person next to him.

Heiwa, who was burning the fire, and Wu and others who were watching nearby all left the place after hearing what was said.

With a look of nervousness and anticipation, he stared at the stove and Han Cheng, waiting for Han Cheng's action.

Han Cheng, who was wearing a plain leather apron, and plain leather sleeves and gloves on his hands and arms, turned his head and saw that everyone had left. He then grasped the pottery plate that was much higher than the inner wall of the pottery jar with both hands, pulled it up, and then pushed it aside. Immediately, slag with very high temperature slowly flowed out of the hole.

The extremely hot slag fell to the ground, making a hissing sound and stirring up a cloud of white smoke.

Han Cheng didn't ask anyone to use pottery jars to catch the slag.

He planned to take people to build a steeper slope here. When the slag accumulated more and more, he would let it roll down the slope to the bottom of the guard post.

Copper ore contains not only copper, but also other metals, such as gold and silver.

However, Han Cheng still discarded the slag without any hesitation. It can be said that he really treated gold and silver as dirt.

This sentence doesn't seem to be accurate. In Han Cheng's eyes, these slag containing gold and silver are not as important as manure.

The reason why he could be so carefree was that he did not have the ability to separate the slag again and get out the gold and silver inside.

Secondly, the value of gold and silver is given by humans. At this time, gold and silver cannot serve as equivalents, nor can they become the eyes of the devil.

If you take a large piece of pure gold to exchange for food with another tribe, it is very likely that the people who have the food will take the gold that is neither edible nor usable, check it, and then angrily throw it back to you.

The slag does not flow smoothly, which is related to the fact that it contains a lot of impurities and is relatively viscous.

It seems that this boiler needs further modification.

The opening for excretion should be changed from a flat opening to an oblique opening, so that the discharge can become much smoother.

It took a while before the slag was finally discharged.

Han Cheng asked his senior brother to get a prepared pottery jar and put it under the hole where the pottery juice came out. Then he pulled out another pottery plate that was blocking the hole. The extremely hot molten metal began to flow out slowly and fell into the pottery jar below...

The scorching temperature gradually dropped, and most of the copper liquid in the pottery jar cooled and solidified.

The pottery jar was smashed, revealing a purple copper ingot in the shape of half a jar.

Looking at the large copper ingot, Han Cheng, Wu, the eldest brother and others who were worried about this matter couldn't help but smile.

Wu, a devout old charlatan, based on the principle of giving all glory to the gods, immediately began to praise the gods who had never paid any attention to him.

Han Cheng looked at it helplessly. These were all the work of himself and others who had worked hard. What did they have to do with the gods?

Although he thought so in his mind, Han Cheng did not say it out loud. After all, he was still wearing the gorgeous coat of the Son of God and was the biggest beneficiary.

After looking at the copper ingots, Han Cheng used a stick to poke the slag that had become a lump.

After turning it over with a stick, we discovered that there was a lot of solidified copper at the bottom of the slag.

No wonder the copper ingots refined this time are so good, it turns out that a lot of copper liquid was released.

It seems that I put too much mineral powder this time. I should put less next time.

Han Cheng thought so, and immediately called Shitou over and put the copper ingots produced this time on the scale.

After weighing, a record was made of how much ore powder was put in and the number of copper ingots obtained.

This way, next time you do it, you'll have something to refer to.

It is impossible to avoid wasting any molten copper, but it can be done less than this time.

Of course, the quality of the ore will be different, and the ratio of copper content to slag will also be different, so it cannot be generalized.

These detailed things require repeated practice, accumulation of original data, and then summary.

Get theory from practice, and then use practice to verify the theory and improve it. With the mutual verification of the two, we can gradually find a similar standard.

Touching the copper ingot, Senior Brother Wu and others talked about it. Wu said that they needed to offer it to the gods first to thank them for their blessings to the tribe.

The eldest brother said that they wanted to forge a bronze shield so that they could be more courageous when facing prey and enemies. Shitou said it would be better to make some bronze pens so that they could engrave better on the pottery.

Han Cheng listened on the side, smiling but saying nothing. On the one hand, he was happy for the state of the people and for the copper in the tribe.

On the other hand, the many wishes that everyone has mentioned cannot be realized before tin or lead is obtained and bronze is made...

In the courtyard, Bai Xuemei, who was carrying a bamboo basket and feeding mulberry leaves to the silkworms in the winnowing basket, suddenly frowned and pressed her lower abdomen with one hand, her face showing pain...

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