A long time ago, Sima Pianpian discovered a coal mine and three iron mines in the mountain forest area.

When the system scanned at the beginning, these iron ores were displayed as "unknown iron ore", which made her a little strange, as far as she knew, iron ore is divided into magnetite, hematite, limonite, etc., which category does this belong to? She couldn't help but sigh that things from the other world were so capricious......

Two years ago, in order to fight against monsters, she had personally tempered this iron ore in the basin, and she had the feeling that there were too many impurities and it was not easy to form. If there is no ability like her, relying on the strength of ordinary humans alone, thousands of beatings are far from enough, she has already let the primitive people try this, but she has never succeeded, so it still needs to be smelted.

The importance of tools in production and life is undoubted, and her desire for iron tools has always been very strong, so she has tried several times to organize primitive people to smelt, but, perhaps because of "unknown", it is very difficult to refine this iron ore, and there has been no substantial progress for a long time......

Since the construction of the station last year, she has started to get some iron ore for the pottery team to do refining tests.

She taught them to build a small blast furnace with a height of one meter and a diameter of half a meter with a slope at the bottom, a transverse exit at the lowest part of the inclined bottom, and a movable clay brick on the outside of the furnace wall, which has ears and can be opened or closed by a guò long clay handle. The outlet is connected to a half-meter-long ceramic open trough to divert the iron liquid that will flow out, and the crucible is placed under the open trough outlet.

Because she was very unfamiliar with the smelting industry, she honestly referred to some of the experience summarized in the source bead materials, and after laying the existing materials layer by layer in the furnace, she began to refine.

Using the blower, the pottery team is quite proficient in temperature control, and Sima Pianpian used coal this time, so the temperature should be enough.

However, it didn't work at first, and after two hours of refining, there was no sign of melting of the iron ore.

So she made the coal into poor coke in the cave, instead of charcoal, and threw it into the furnace...... Still not working, she picked up the dry bones of many animals from the plains, smashed them into bone meal, and added them to the furnace to replace the gravel as limestone......

As a result, there is no effect, is the temperature not enough? Or is there not enough time? Or is it the wrong ratio of materials?

In response to these doubts, she took the time to take the pottery team to refine it several times, each time trying a different way, but in the end it failed.

She thinks that there should be no problem with the principle, but what is the problem?

Puzzled, her fiery confidence was also cooled down by repeated failures, and because there were many things, she temporarily put down the matter, only to let the pottery team find new ways to try from time to time, whether it can succeed or not depends on luck.

And just a few days ago, Xing told her that the experiment had some improvement, and the iron ore finally showed signs of melting, but after burning for a whole day, it only softened in the end, not liquefied.

However, Sima Pianpian was already very happy, she inquired in detail about the refining process, and the pottery team told her that the process was still the same as before, the only difference was that the iron ore was boiled in boiling water for half an hour.

Sima Pianpian black line, it seems that the pottery team dares to try any strange thing in order to find a new method......

She didn't know what different chemical reactions this unidentified iron ore would have in the heat of water and the heat of no water, but as long as there was progress, it would be gratifying, and she didn't care if the process was ridiculous. To take it a step further, she asked the hominids to continue boiling the ore for a longer period of time, taking it out and drying it, and then starting to refine it......

It worked!

Looking at the red iron juice melted in the crucible, Sima Pianpian was extremely excited, it was really not easy...... From then on, primitive man could finally bid farewell to the Stone Age and enter the Iron Age......

She had already prepared the casting system, a hoe-shaped cavity made of clay, into which she now simply poured iron juice. The iron flux flows into the cavity through the funnel-shaped gate of the guò casting system, and the excess iron flows out of the riser, which then waits for it to solidify and cool.

Two days later, Sima Pianpian peeled off the clay, took out the solidified iron, and inserted a sharpened wooden stick more than one meter long into the hole specially set aside for the hoe handle, and then fixed it with two wedge-shaped small wooden blocks, and a complete silver shining iron hoe was born!

Those primitive people were also very excited, scrambling to observe the iron hoe, they actually couldn't figure out why the chief kept insisting on letting them burn stones, originally they thought it was strange, and also thought that a lot of pottery making time had been wasted, but at this moment, feeling the strength and sharpness of the metal, they finally understood...... For a time, the enthusiasm of the pottery group for ironmaking was greatly improved.

Sima Pianpian struck while the iron was hot, melted the remaining iron ore in the station, and cast it into iron axes, shovels, iron knives and other common living tools. It's just that there are too many impurities in this kind of iron ore, a piece of ore the size of a football can only be refined into a fist-sized piece of iron, and the slag after smelting is dark green, I don't know what kind of substance it is, Sima Pianpian is not willing to throw it, and it is stored in the zài warehouse, and then I will study it when I have time in the future.

And today, when she came to the mountains and forests, she wanted to mine some more iron ore and coal mines, and make a batch of mines to hoe out first, so that in the future, primitive people could be arranged to come here to mine, including salt mines, and finally no longer have to rely on her only machete......

At this time, Sima Pianpian was in the mine, taking a short rest, and suddenly, a familiar throbbing sensation appeared in his brain.

At the same time, the system alarm sounds!

System Warning: There are unknown creatures fighting for territory, the number is unknown, the mental pressure is too strong, the system is dangerous, please evacuate quickly!

The sirens continued to sound incessantly.

"......" Sima Pianpian hurriedly ran out of the cave, she frowned, covered her head with one hand, hesitated for a moment, or turned around and left the place.

This was the second time she had encountered such a warning, even though Yuanzhu had undergone two evolutions, this pain had not diminished in the slightest, and that kind of coercion could still pose a threat to her system, so she didn't dare to risk staying......

After going through so much, her perspective on this matter is naturally different, she still doesn't know, if the unknown creature is just an orc, then what is the concept of "fighting for territory"? In the past, when she faced the orcs so many times, the spiritual coercion she felt never affected her, why did she have such a strong coercion when she was "fighting for territory"?

After Sima Pianpian ran all the way to the stone city east of the mountain range, the alarm and the pain in her brain finally stopped, she stayed where she was, looking in the direction of the mountains and forests, and a trace of unwillingness flashed in her eyes......

PS: (This chapter is published as a deposit)