In fact, you really can't blame people for studying history, the classification of iron in ancient China is different from the classification of iron in modern times, and things with the same name are often two products. Pen @ fun @ pavilion wWw. ｂｉｑUｇE。 ｉｎｆｏ

Moreover, the classification of iron in modern China is not the same as that in foreign countries -- we call it wrought iron, foreign iron pure iron, pig iron, and cast iron abroad......

He was able to get to this point, and he can be regarded as a super-level performance.

At the end of the frying, at this time, there will be a dog head to seize the time, with a shovel-like tool, the product that is solidifying rapidly, cut into small pieces and take it out, waiting for the later production into tools.

But this did not achieve the goal - not every furnace of steel can really 'fry steel', so the steel filling method was devised -

Wrought and pig iron are processed into thin flakes, blended, stacked one by one, and then heated in a furnace to melt them into a lump. As long as the proportions are well controlled, steel can also be produced.

After a series of process improvements, the labor cost of steel is not much higher than that of pig iron, and the fuel here is almost free.

With the manpower-saving "continuous production method of frying steel - filling steel", we can not only exchange cheap steel for grain with the 'hill of the brave', but also change equipment for the dog's head, and even consider whether it can be directly put on the steel cannon.

On the other hand, Tesfil remembered a biological nitrate production technology - nitrifying bacteria to make nitrate.

The 'sleeping island' where she is located often experiences deterioration of the water body, and the green algae and red algae explodes. Before the crossing, they often had to spend a lot of effort on biological control, and there were a few times when the instructor brought them students to do it.

However, that set of technology is for nitrification, and now the process must be reversed, and denitrification becomes nitrate.

She first found a few spacious caves in the basement with ventilation in front and back, and then made a lot of large wooden plates out of wooden planks, stacked them like multi-layer shelf beds, leaving enough space in the middle to ventilate.

The bottom of the pool should be paved with a mixture of bulky clay, fine sand, and crushed charcoal to give bacteria a comfortable living space. To be on the safe side, some weakly alkaline materials are also mixed in. (Because nitrifying bacteria cannot survive acidic environments)

At the same time, it is necessary to loosen the soil regularly to ensure air permeability, because nitrifying bacteria are aerobic bacteria.

This is not enough, and a special bicycle driven fan is specially made to ventilate the cave.

It is also necessary to pay attention to heat preservation in the cave, because nitrifying bacteria prefer an environment of twenty or thirty degrees Celsius, and the production efficiency is the best. This is not difficult, the cave is already warmer than the outside, and a few small stoves are installed, the chimney is knocked out with an iron sheet, and a circle is walked around the large wooden plate, and the furnace workers are all alive.

The next step is 'farming': fish and shrimp, all kinds of animal waste, human and animal feces and urine, etc., are mashed, rotted in the natural environment, and diluted with water.

At the same time, the nitrifying bacteria community that had been cultivated in advance was scattered and transplanted into each wooden tray, and then the aqueous solution of the treated putrid matter was sprinkled on the sand layer on the wooden tray, and then the dog heads were regularly poured with warm water.

All kinds of fish and shrimp, human and animal feces and urine, first in the natural decay, produced a large amount of ammonia, and then, several nitrifying bacteria growing vigorously in the wooden tray oxidized ammonia into nitrate.

At this point, you can take the wooden disc and start scraping.

Now, these nitrates are mixed with a variety of salts, and plant ash needs to be added for chemical reaction, first removing calcium sulfate and carbonate that are easy to precipitate, and the rest are potassium nitrate, sodium chloride, etc., and then you can use the heating and crystallization characteristics at different temperatures to obtain pure potassium nitrate.

These processes may seem complicated, but as long as the division of work is done well, kobolds can run in an orderly manner - and it is easier than carpenter's work.

As for why the Isle of Sleep taught a little golden elf mage about chemical reactions, see Chapter X.

It is more difficult to produce sulfur, because the raw material is only pyrite, and it is necessary to make a very complex chemical reaction process.

Step 1: Pyrite is heated and water is added to make sulfuric acid and sulfur dioxide.

The second part, pyrite and dilute sulfuric acid to make hydrogen sulfide,

The third part is the reaction of hydrogen sulfide with sulfur dioxide to produce sulfur......

Poor Guan Renxiu said: Just looking at the chemical formula, it can barely be regarded as junior high school chemistry, I can calculate the reaction ratio, but how to mass production, hehe...... I'd better go research on dog eggs, shall I?

Brother Zhalong, a senior high school student, said: I don't know! I don't know anything! I'd better lead the team out to cut wood!

On the other hand, Niu Jingtian, who had traveled a long distance, although the non-stop construction of camps slowed down the speed, but because of the second run, he missed a few laps, and when he arrived in Saka Town, it was already more than half a month later.

"Finally back, eh...... Why is this camp so miserable?"

The small camp that was left behind is still uninhabited and lonely, except that the city walls have been crooked in a few places, the watchtower has simply collapsed in half, and the bed crossbow has been removed by more than one bastard.

When the camp was first built, it was blindly greedy, the foundation was not solid, and no one took care of it for more than a month, so it was normal for some problems to occur. Fortunately, this time I brought a large group of dog heads, and it didn't take much effort to repair them.

The thick-nerved Niu Ida didn't take the few crossbows he lost to heart, they were all the earliest versions of the single bow, otherwise how could he stay with this person's slashing.

A large group of kobolds repaired camps and docks on their own, and even began to study and build sea boats. Boats were weaving in and out of the swamp, and there was even a long row of poles hanging from the camp - which was full of dried fish.

During this period, there was a faint human activity around, but they were carefully hiding one by one, and Ushiida didn't know how to greet the locals like he was now.

The survivors watched a large group of dog heads come and go, fishing and building houses, and even many dog heads made mats from reeds, which seemed to be intended to live permanently......

Captain Hu Ge, the most respected of the local survivors, has been watching these 'lizardmen' from the sea for a long time.

The place where these 'lizardmen' set up camp is across the river from the burnt white ground of Samri Harbor, sandwiched between the Ink Emerald River, facing the sea to the north and the Swamp to the south, a fairly convenient location for transportation.

It's just that the temperature here in the harbor is high, it never freezes in winter, and there is a large swamp not far to the south, and there are many mosquitoes that can knock people on their heads, so the population outside the city is not large, and the fields are not well developed.

Now that the demon had set a fire, it had become even more desolate, and the small camp was very glaring.

Niu Ida's children's shoes lie on the reef by the sea, watching the tide rise and fall, making a lookout stone. I'm in a very tangled mood right now......

This place can be a big dog head! Next to it is the sea, and there are so many big fish in the sea! Get a fishing team, and it is a trivial matter to storm tens of thousands of dog heads!

Even if you don't have a fishing team, you can get a rope to catch sharks......

However, they did not dare to ...... If you have too many dogheads, you'll starve to death...... Sorrowful!

sighed, now there is only the reclamation of wasteland, the food is hungry, fortunately, the temperature on the seaside is high, and there is a lot of wasteland, so it is better to change to grow grain.

So the question is, how do you grow grain? I really haven't learned this......

In the evening, when the sky was not so bright, a group of kobolds came out to patrol with white flags, and there were more than twenty people.

"The king called me to patrol the mountains~~" Foreman Dog 011 sang loudly.

"Woo woo woo woo woo~" More than a dozen dog heads responded in unison.

"After patrolling the back mountain, patrol the front mountain~~" Another foreman, dog 012, took the next sentence.

"Woo woo woo woo woo~" More than a dozen dog heads shook their heads.

"There's nothing in front of the mountain~~"

"Woo woo woo ~ "

"There is a fat monk in the back mountain~~"

"Woo woo woo ~ "

"Wang, there is fresh meat on the seaside!"

A group of dogs barked and then swarmed to the beach - a poor turtle was spotted.

"What a big turtle!"

"Meat meat!"

The doghead ration is rationed, and you can't starve to death or eat enough, let alone taste.

If you want to be full, you have to rely on yourself to find extra money, and now the dog heads of the whole team are very happy!

"Do you want to carry it back to the king Wang? The king said that the big meat will be divided into half Wang!"

"Half is half, I'm so hungry now, we'll eat Wang now!"

This group of nearly twenty kobolds is very fast, piles firewood, kills turtles and receives blood, and is very skilled.

The hapless turtle was about a meter long and was quickly filled with the head of a pack of dogs, leaving only the shell in the middle.

More than 20 dog heads were full of oil, but counting the number of people, in fact, no one divided much, and only half of the food was eaten, which was really painful.

"Let's eat the meat in the shell, let's take the shell back~"

"Yes, yes, so many shells for the king, it's enough for half of Wang~"

The dogheads cheered and simply gnawed all the turtle meat, leaving only a bare shell on the beach.

The patrol took to the road with flags and singing the patrol song.

As for the half of the shell for the king, it was naturally thrown on the beach - no one picked up this thing, and we will come back and get it when the king asks for it!

This time the outing was a little delayed, and the foreman dog 011 patted his head: "If you can't catch up with dinner, Wang, let's take a shortcut!"

So, the whole team turned around and went straight into a mangrove forest.

The dense mangrove forest by the sea is actually a lot of plants growing together, and the ground is messy and intertwined with aerial roots, making it difficult for people and animals to walk.

The advantage of the kobold's small size was brought into play, and while using a firewood knife to open the way, he jumped up and down, and soon walked far away.

"Wang~, it's so strange over there!"

A dog's head with good eyes finds a strange flora.

In the middle of the mangrove forest, a field has been leveled, and a large field of green crops grows on the ground.

The kobheads immediately fell silent, bent down, and touched lightly.