Chapter 65

Baskets of materials are soon put into the local blast furnace. The local blast furnace is not big. Even if all the coke is put in at one time, only about three tons of hot metal can be produced.

Three tons of iron sounds like a lot, but don't forget that the proportion of iron is more than 7. These three tons of iron don't even have half a cubic meter.

But that's enough for the gaoshu tribe.

Before feeding, a lot of wood has been erected in the blast furnace. Now, without kerosene ignition, wood can only be used to ignite. As for whether the carbon contained in the wood will affect the hot metal, the stone bear has no concern at this time.

After all, it is the first time to use local blast furnace to smelt iron. As long as the molten iron can be smelted successfully, that is the biggest victory.

"Light up!" The stone bear gave a loud drink again, and then the people holding the long handle torch put the torch into the tap hole and slag hole. Soon, the gas outlet and feeding port on the top of the blast furnace began to emit thick smoke.

It took a long time for the smoke to dissipate gradually. At this time, even through the thick wall of the furnace, the surrounding people could hear the "whirring" sound of fire in the furnace.

Eight people divided into four groups, standing in front of the four bellows, began to pull the bellows, and sprayed a continuous stream of fresh air into the furnace.

In fact, the best way to smelt iron is to spray hot air with a temperature of more than 1000 degrees into the furnace, but where is the condition to heat the air now? So, cold air is cold air. It's better to burn it for a while.

Coke is not as unburned as charcoal. When coke is burned, it not only produces extremely high temperature, but also has a very long burning time.

As the coke is ignited by the wood and releases a lot of heat, the crushed iron ore and limestone begin to react with the fresh air.

When the coke in the continuous influx of fresh air support more and more prosperous, iron ore, limestone began to melt.

Because of the limitation of the furnace, the heat can not be dissipated. The temperature in the belly of the blast furnace soon rose to more than 1500, and it continued to rise until it stabilized at about 1700, although this process took a long time.

At this temperature, the iron ore has completely melted, the pure iron contained in the iron ore becomes pure molten iron, and the impurities will react with limestone to form slag, which will float on the molten iron with the burning coke and carbon slag, and finally be released from the slag outlet.

A clansman stood on the scaffold at the top of the blast furnace and observed the changes in the furnace from a distance through the observation hole. Although the light in the furnace is very dazzling, it can be seen whether the iron ore is melting and whether the molten iron is generated.

From morning until noon, the people standing on the scaffold yelled excitedly: "there is a lot of hot metal in the stove."

Stone bear smile, since there is molten iron generation, it means that the iron making did not fail.

After waiting for a long time, Shi Xiong told the prepared people to let go of the refractory plate at the slag outlet.

In this kind of small blast furnace ironmaking, the slag must be discharged first, and the hot metal can only be discharged from the taphole after two or three times of slag discharge.

This process continued for about half an hour. Finally, when the slag was almost out of the tap hole, Shi Xiong ordered the people to open the refractory plate of the tap hole.

When the heavy refractory plate was opened, the white molten iron with huge heat flowed down from the taphole and into the pond which had been heated all the time. When the pond was heated, the air over the pond was distorted.

The people who had been ready for a long time scattered the pig iron particles into fangtang. The pig iron particles were smashed out by the stone bear after collecting all the remaining ironware from the tribe.

Although the pouring steel method is easy to use, Shi Xiong finds that he doesn't have any cooked iron on hand. The pouring method needs the reaction of hot metal and wrought iron, and finally the steel can be obtained.

Since there is no wrought iron, simply use the method of stir frying steel. In any case, the two steelmaking methods are in the same line.

The broken pig iron fell into the pond and soon melted. At this time, the temperature of molten iron is definitely more than 1500 degrees, and the pig iron with a lot of impurities can not withstand such a high temperature.

After scattering the crushed pig iron, these people quickly picked up the stone stick made of kaolin and began to stir it in the molten iron.

After stirring for a while, these people are already sweating profusely. It's not easy to stand beside the fangtang with a temperature of more than 1500 degrees and stir the molten iron. Even though it's a little cold now, the people standing next to fangtang still can't resist the huge heat from molten iron for a long time. But it doesn't matter, there are other people to take over from them.

When the molten iron began to change to semi solidified and semi liquid state, the stone bear gave the order again: "ladle the molten iron into the mold!"

Suddenly, more than ten people with long handled stone spoons put the heated stone spoons into the molten iron one after another, then scooped out a spoonful of molten iron and poured it into the heated mold.

These heating moulds are made of iron hammers, iron felt, thin iron plates, shovel, hoe, plough, plough, plough, steel bar and so on. The first batch of steel and iron must first be urgently needed for the most needed tools. Of course, there are also iron knives, iron spearheads and big iron pots, which are in urgent need, but the quantity is just a little less.

With hammer iron felt, we can process some iron and steel products with higher strength. After all, this kind of iron and steel products produced in the form of casting can not undergo heat treatment such as quenching. With hammer iron felt, we can process other iron and steel products by heating the iron and forging the hammer. We can also carry out various heat treatment processes to strengthen the strength of iron and steel products.

The thin iron plate is prepared for subsequent steelmaking. The carbon content of the steel produced from the hot metal of this furnace is tested. If the carbon content is relatively low, these thin iron plates can be used for pouring steel in the next smelting.

As for shovel and hoe tools, let alone the main task now is to increase grain production. Only by raising grain production can the clan members have the mind to do other things, such as steelmaking, salt making and so on.

And those steel bars, needless to say, are for taming bison.

The stone bear doesn't intend to let the tribe tame only a few bison. There are not too many bison to be tamed. It's hard to say that there are only one bison in each family, but at least every family must have such a big animal, so that the food production can be fully guaranteed.

Of course, if the tribe wants to tame more bison to form a bison team, it's not impossible, but it needs a lot of bull nose rings