Chapter 39

The pig iron pieces melted, and the next thing was easy to do.

The next thing is nothing more than to use kaolin + bone powder fired kaolin rod to stir, and then add the broken pig iron particles.

As a matter of fact, the crucible was used to smelt the pig iron, and Shi Xiong used the method of frying steel. The pouring method is to wait until the iron ore is smelted into molten iron. Now smelting such a little pig iron, of course, is the most suitable method to stir fry steel.

Unfortunately, the tribe couldn't find a tool to stir the molten iron, so the stone bear had to fire several kaolin sticks according to the standard of firing refractory bricks. Because only this kind of clay rod made of kaolin and bone powder can withstand the temperature of molten iron.

It's just that stone bear doesn't know whether other chemical reactions will occur when using this kind of soil rod to stir molten iron.

But now the stone bear is really helpless. A very important step of stir frying method is to keep stirring the molten iron, so that the sulfur, phosphorus, carbon and other elements in the molten iron react with the external oxygen, so as to reduce the carbon content in the molten iron and remove impurities.

Of course, adding pig iron particles to the molten iron is also a very necessary step in the stir frying method. But the tribe doesn't even have a millstone. These pig irons can only be smashed into tiny particles bit by bit with a hammer

Anyway, it's really easy to do everything, but it's impossible not to do it. The conditions are here. It is this truth that the so-called skillful woman is cooking without rice.

As for how long to stir and how many pig iron particles to add to the molten iron, in fact, the stone bear has no idea. All in addition to simplicity, but also rely on Mongolia!

Anyway, when the pig iron began to melt, another bonfire was set on the side of the stove. Under the order of the stone bear, several people began to put the burnt kaolin molds on the bonfire to bake.

This behavior makes these people even more confused. They have roasted meat, corn and other food, but they have not roasted such things made of mud.

Stone bears won't explain to them why they did it now.

Before pouring the molten iron into the mold, it must be heated. Otherwise, if you pour the hot molten iron into the cold mold, there will be a tragic disaster - the mold has a 100% chance of exploding

Finally, stone bear estimated that it was almost done, so he personally picked up one of the few iron spoons in the tribe and began to ladle out molten iron from the crucible.

The yellow and white molten iron is quickly scooped out by the iron spoon, and then quickly poured into the kaolin mold with the baking temperature of six or seven hundred degrees. The next step is to wait for the molten iron in the kaolin mold to cool down.

As for heat treatment such as quenching and tempering, Shi Xiong can't care about it now. He doesn't understand the heat treatment technology, so he can only use this most primitive method to cast what he needs.

The molten iron melted from the smashed three iron pots gave the stone bear three plowshares, two tongs, a short chopper, three spearheads and more than ten arrows.

Shi Xiong also wants to know what the performance of these things is. However, it will take a long time for the molten iron to cool down naturally, which is no shorter than the time needed to melt pig iron.

So after finishing all this, Shi Xiong ordered to put out the fire. After arranging several people to watch over the molten iron molds, he turned around and went back to rest.

This small pot of molten iron consumed more than half a day. The most important thing is that in the whole process, Shi Xiong was always on tenterhooks. His attention was highly focused, which was also a great consumption.

So when everything is settled, even the stone bear can't hold on.

In contrast, after watching for most of the day, the people of the ethnic group are talking about it one by one.

For them, what happened today is something they have never seen or even imagined. The white flame coming out of the furnace, the little melted pig iron, and the clansmen who kept stirring the molten iron with long earth sticks but were being roasted all made them realize that what happened today is really amazing.

If nothing else, in their eyes, the iron that could never be melted turned into a pot of hot metal, which shocked them.

Many people saw three precious iron pots smashed, then thrown into the clay pot made of mud, then burned and melted, and finally turned into strange things in the mold.

So, most of the people are talking about what the guardian finally made.

And the discussion lasted all night.

The next morning, the whole tribe began to be lively again. Countless people who had been aroused by curiosity all went out of their homes, and then quickly gathered in the open space in the middle of the tribe. Of course, they also saw the embarrassed appearance of the people on duty sleeping with a loud voice.

After a night of natural cooling, the molten iron in the mold has been completely cooled down and bonded with the mold.

Accompanied by several people, the stone bear came over with a stone hammer. A series of performances of the guardian yesterday made many people spontaneously support him.

He got close to the molds and spat on them, but there was no response. Shi Xiong safely picked up a mold and put it on a flat stone, then raised his hammer and hit it down.

The mold made of kaolin and bone powder was immediately broken, leaving a complete casting.

These are some arrows, which are the "least valuable" of these castings, so Shi Xiong plans to use one of them to do an experiment.

Although the wood planer faithfully recorded all the key data such as the addition ratio, smelting time, mixing time and so on in the smelting yesterday, the stone bear has no bottom in his mind about these things, so he needs to test them.

The arrow is about five centimeters long and is a flat, tapered arrow. The whole body is dark with a lot of mold particles on it.

The stone bear took the arrow and rubbed it hard on the flat stone. It quickly wiped off the black oxide on the side of the arrow. Of course, there were clear scratches on the big stone.

Lilei, gaoniu, kabulu sacrifice and some influential people in the tribe all gathered around the stone bear to watch its operation. Seeing a lot of scratches made by this small arrow on the hard stone, several people's faces were immediately happy.