But from the silver-gray metallic luster, it can be seen that this should be tin, and someone sent a pillow when he was sleeping, and he just found copper, and now he has obtained tin without intentionally inserting willow, and the important thing is that it is still in a cave.

Wang Tian has decided that he will enter every cave in the future, because this is his own cave blessed land, just like under the cliff in martial arts, there can always be a lot of good things......

For this unexpected gain, it can be said that it took no effort at all, Wang Tian was already overjoyed, and he immediately asked the second brother to start beating the stone inside the cave wall.

Then set up a fire and began to roast the stones, and under the fire where the food had been grilled before, there were more or less tin blocks formed by the melting of tin metal, and the silver glittering piece, even in the dim light of the fire, was very dazzling.

Of course, after determining that this is an indispensable material for making bronze, Wang Tian did not let everyone continue to work, but asked everyone to rest quickly and continue to work tomorrow.

We have been collecting malachite for half a day in the morning, and this way is going upstream, rowing and supporting the boat as a slender man, and now it is too tired to do it, things have to come step by step, and the body is exhausted, which is worth the loss.

And he himself quickly collected the dissolved tin and put it into the back basket, as long as the existence of these two materials for making bronze was confirmed, the coming of the Bronze Age would be unstoppable!

Because of the heavy rain before winter, the temperature dropped dramatically, and they did not dare to light too many bonfires in the strange caves, and the two pieces of linen used as sails played a huge role in keeping warm, and the children were able to spend the night safely.

Due to the good warmth of the leather clothes of the Tianlong tribe, it was originally planned that the night would be carried out by the people of the Tianlong tribe in batches, but under the strong request of the fish, this work was still undertaken by the two tribes.

Wang Tian did not object to this, after all, the second brother, they were really working hard today, and the good interaction between the two tribes made Wang Tian see the perfect integration of the two tribes after the tribe merged.

There was nothing to say all night, and after dawn the next morning, there was no need for the Son of Heaven to order, and the people of the Tianlong tribe, under the leadership of the second brother, began the mining of tin ore early in the morning.

They learned that these metals could make tools as sharp as the axes of their relatives, and that they were all like chicken blood, and that if the Son of Heaven hadn't stopped them, they would have been able to make them in the dark last night.

In order to reduce the weight of transportation, due to the low melting point of tin, Wang Tian directly refined the collected ore and obtained relatively pure tin metal.

Judging from the fact that the purer tin metal can be extracted by burning a fire directly, the tin ore in this cave belongs to cassiterite in the easy-to-select ore, which is a quartz-type ore with high purity.

In later generations, tin ore with a tin content of o.1% has mining value, of course, the ore with this component content must be selected, otherwise it cannot be directly refined.

Now the tin ore in this cave has reached the selection standard and can be directly refined, which is why Wang Tian can directly use the most primitive method to refine tin metal with high purity.

Wang Tian estimated that the second brother collected a maximum of 1ooo catties of ore, and after preliminary refining, they obtained about 4ooo catties of tin metal, which has reached the requirement of 4o% of high-rich selected ores.

The ancient Chinese "Examination of the Gongji" has: "Gold has six Qi (gold is copper, chemically called copper-tin alloy Qi): six points of gold, and tin is one, which is called the Qi of Zhongding; Five points of gold, and tin is one, which is called the axe and pound; Four points of gold, and tin is one, which is called the Qi of the halberd; Three points of its gold, and tin is one, which is called the Qi of the big blade; Five points of gold, and tin is two, which is called the Qi of cutting and killing: half of gold and tin, which is called the Qi of the fire. This means that the ratio of copper to tin varies from bronze to tin for different purposes.

Wang Tian naturally couldn't remember so much, but he could use stupid methods, that is, to experiment one by one.

Now he got 4oo catties of tin, which is enough for him to toss for a while, and by recording the alloy characteristics obtained from different proportions, he can finally find the best configuration ratio.

Which recipe is most suitable for making agricultural tools, and which formula is used for weapons, if you make agricultural tools, you may need to strengthen the hardness, and if you make weapons, the ductility may need to be more demanding.

These things are not in a hurry, only one by one with a stupid way to test, in order to find the best ratio, and in the long winter, it is undoubtedly the best time to do these tests.

There is nothing to do in the winter, and refining metal does not feel hot, which is not an easy job to do on a hot summer day.

But before it started, Wang Tian had already thought about being the shopkeeper, and this job was mainly handed over to the future witch of the Tianlong tribe, the little god stick of Zhou.

Of course, the age of Zhou is too young, in order to ensure safety, in the early stage, Wang Tian will also follow up the whole process.

The mining of tin ore was much easier than that of copper ore, and at about nine o'clock in the later world, the refining work was completed, and the 4oo catties of tin metal were made into iron lumps in the shape of a large bowl.

This is because there are only two large bowls that were fed to the pandas that day, and they were used to make molds during the initial refining, and as for the impurities contained in them, they can be returned to the tribe for purification again.

This is much easier than returning to the tribe with 1ooo catties of tin ore, although the people of the River tribe don't know what the Son of Heaven is doing, but in the process they are also helping to collect firewood and do all kinds of work within their ability.

When they saw that the Son of Heaven had easily burned the stone into liquid, the expression on their faces was unbelievable, and when the liquid cooled, what they got was a silver stone.

This reminded them of the glittering golden things in their tribe, and in the haze, they seemed to understand what the Son of Heaven was doing, but when they thought about it carefully, it seemed that nothing appeared.

The group then returned to the river, the 4 bamboo rafts were not washed away by the flood peak due to the sturdiness of the bundle, but the 4 weeks of the bamboo raft piled up a bunch of dead branches and rotten leaves, and everyone cleaned up the old half a day before pushing the bamboo raft to the river surface again.

The water level of the Dragon River has now risen by more than 3o centimeters, but since there is no heavy rain downstream, and the waters of the River Tribe are much wider than here, the people of the River Tribe are not worried about the tribe being flooded.

The people who had nothing to say all the way were like arrows, desperately rocking the oars, eager to let the bamboo raft put on its wings and fly back to the tribe, and three hours later, the Tianlong tribe was already in sight.

Looking at the towering city walls and the red brick and tiled houses that had never appeared in this era, the people of the Tianlong tribe looked at all this with such kindness, it was their home, and it was their place of life in this era of famine.

The excited people shouted loudly, and the movement on the river was naturally guarded by the dutiful city walls, so a moment later the drums sounded

Knock knock... Knock knock...

Ringing three times in a row, this is an early warning, and the arrow that Linghe had just become the groom's official reacted as quickly as possible, and immediately climbed the city wall to observe.

The other warriors of the tribe then moved into their positions, two three-bow bed crossbows had been wound, six trebuchets were already loading stone shells, and the archers and slings were all in place.

The drawbridge in front of the tribe's gate has been pulled up, the gate has been closed, and the entire Tianlong tribe has entered a state of full alert.

Because of the observation post, the number of bamboo rafts that have entered the cultivation area of the Tianlong tribe is actually four, and the number of people is far more than the number of people from their own tribe, all the people have already taken their places, and the war machine of the Tianlong tribe has been activated.

Everyone waited quietly, the movement from the river should not be from Youniu's attack, was the Son of Heaven returned, or was there something else?

The seven little beast scouts had been sent out, and from a distance, they saw that the Divine Dog Warrior was running downstream with their slightly stiff tails, and the tails of the two little tiger cubs were much more cheerful in comparison.

Looking at the reaction of the Divine Dog Soldier, it should be that the Son of Heaven is back, but today is only the 3rd day, when the Son of Heaven goes out, it is said that it will take 5~6 days, and the number of people is not right, is there something wrong? The cautious leader had already seen the strange place in it, so he also became cautious, knowing that before the Son of Heaven left, he repeatedly instructed to maintain the safety of the tribe.

Since the fleet was still far away from the Tianlong Tribe, a sense of uneasiness rose in the leader's heart......

ABC