Section 537

"Kaolin is a very high-quality non-metallic mineral, mostly clay and clay rock based on kaolinite clay minerals. Because it is white and delicate, we Chinese call it dolomite."

"Kaolin is mostly dull, white and delicate when pure, and gray, yellow, brown and other colors when containing impurities. The appearance can be loose soil blocks or dense rock blocks depending on the cause..."

After a brief introduction, Lu Yu zoomed in again.

He took a photo of the details of the clay in his palm.

Then he continued:

"Look at the color of the kaolin here, its purity is really evident."

"Pure kaolin is white and delicate, soft and has good physical and chemical properties such as plasticity and fire resistance. Its mineral composition is mainly composed of kaolinite, halloysite, hydromica, illite, montmorillonite, quartz, feldspar and other minerals."

"Kaolin has a wide range of uses, mainly in papermaking, ceramics and refractory materials. It is perfect for making casting molds."

The density of kaolin is between 2.54-23.

The melting point is about 1785℃, which is very fire-resistant.

At the same time, it is also plastic.

Wet soil can be molded into various shapes without breaking, and can remain unchanged for a long time!

"Kaolin is highly respected in China, and is named after Gaoling Village in Jingdezhen, Jiangxi."

"However, it is not unique to China."

"In nature, it is widely distributed and there are a large amount of it in existence, about 20 billion tons."

"Among them, the Australian continent closest to us has a very large kaolin deposit with a very considerable output, so it is not surprising to find kaolin here."

While speaking.

Lu Yu had already unloaded the bamboo basket.

He dug up the soil layer in one go.

He filled it up one handful after another.

Because it was just to make a mold, it wouldn't take much anyway.

Half a basket is basically enough.

Instead of bringing them all back to the camp, it's better to put them here and take them whenever you need them.

It's also a lot more convenient.

"Okay, brothers, it should be almost done."

"This soil is enough for us to make a perfect mold..."

Carrying the bamboo basket, Lu Yu felt around in the pit.

Finally, he found a relatively low place, climbed up, and returned to the camp along the same route.

...

Arrived at the place.

Lu Yu put the clay aside first.

He turned around and took out the wooden tile mold that was used to make the tiles.

"This tile mold can help us a lot. The size is just right."

"Otherwise, we have to make it again."

After that.

Lu Yu sat down next to the furnace.

He put the tile mold on the mud-covered stone slab.

Then, he scooped up a large handful of kaolin and poured it into it until it was completely filled and compacted.

With this clay mold, all he had to do next was to carve the desired shape on it.

"Because the copper material restored is limited, there is basically no hope of making a large jungle axe, but it is more than enough to make a Viking battle axe to play with."

Holding a stone knife.

While carefully painting on the clay model, Lu Yu explained to the audience:

"The Viking battle axe is the most common and most used weapon by the Vikings."

"In the cold weapon era, almost everyone had one. It was improved from the commonly used logging axe. The head is crescent-shaped. It has great lethality when swung. It also has the effect of breaking armor and shields. It is no problem to cope with daily production and life."

"The weight of the Viking battle axe is often not very heavy. It can be thrown and used as a close combat weapon. It is much lighter than the sword."

"And it is easy to operate. It is far less cumbersome than people imagine. It is a short and compact type. The requirements for materials are not so harsh. It should be our only choice at the moment..."

Very quickly.

Chatting and painting.

It took less than five minutes.

Lu Yu deeply engraved the general shape of the battle axe on the clay model.

The axe blade is of moderate length, and the curved blade surface is very exaggerated.

This is also one of the characteristics of the Viking battle axe.

It is precisely because of this design that the Vikings can easily concentrate their killing power at one point when fighting with battle axes.

It can easily break the protection of helmets and chain mail!

In fact, in the history of Northern Europe, we can often see descriptions of Viking warriors splitting the enemy with one axe.

"Okay, here, the mold is basically ready."

"Next, let's get straight to the point-"

Then.

Lu Yu did not stop.

He hurriedly took the fire and lit the firewood in the furnace.

He held the bow drill of the blower tightly and kept pushing and pulling.

"Whoosh--!"

The flames were big and small.

The firewood in the furnace finally burned thoroughly.

Seeing this.

Lu Yu first put the clay crucible with copper particles into the firewood pile.

Then, he poured another circle of charcoal.

"After the fire starts, light the charcoal directly."

"Let the charcoal fire wrap the crucible. During this process, you must increase the firepower as much as possible while the crucible is heated evenly. Don't be stingy with the charcoal, and don't be stingy with your own strength--"

The sentence was not finished.

Lu Yu picked up the drill bow again and pulled it madly!

"Go God Yu!"

"Hand speed is invincible!"

"Copper smelting addiction + Qilin arm =?"

"Crazy output ing!"

"There are new materials in the ghost animal area!"

"incredible……"

…

The operation took about ten minutes.

Charcoal fire in the furnace.

Getting redder and redder.

The clay crucible also underwent subtle changes.

Although it has not turned red yet, judging from the structure of the clay surface, the temperature in the furnace seems to have reached its peak long ago.

After taking a look at the situation inside the furnace, Lu Yu didn't give up and poured another pile of charcoal into it.

"Maintaining furnace temperature is the key to smelting metal."

"Be sure to add charcoal in time."

"Don't be too troublesome."

"Because once the temperature drops, all the previous efforts will be in vain."

While talking.

An hour passed.

At this time, the furnace had already eaten three waves of charcoal.

The bottom of the crucible has also had a very obvious reaction.

Unknowingly, it turned completely red.

The copper material inside seems to be melting little by little...

See here.

Lu Yu finally breathed a sigh of relief.

But the movement of his hands still didn't stop.

Still holding the bow drill, he kept pushing and pulling.

"When the clay crucible turns completely red, the copper material inside will naturally turn into copper water."

"But the process will be very long."