I do research in ancient times

At this time, Liu Tie brought the burnt limestone.

The product of calcined limestone is quicklime. Liu Tie made the quicklime burnt extra finely this time in order to apologise.

Ning Fei expressed his satisfaction, and motioned for him to carry the quicklime to follow him to the small fire room.

As soon as he walked forward, a large string of rice dumplings followed him, and he was suddenly angry and funny.

"Why are you all following me? Don't you go to the dining room to line up after dinner?"

He paused, and suddenly smiled treacherously.

"Don't stare at me, I can't make ribs. Clay and I made a reservation with the restaurant before, so don't worry, you won't have anything to eat if you go late."

Hey, the contributors to wild boar are still a bit privileged.

He looked at Liu Tie again.

"Brother Liu, just send the lime to the small fire room. I'll do the rest by myself. You all go eat quickly."

"Then I'll take out the food and work with Juzi!"

Liu Tie smiled, carrying a bucket of lime, and muttered as he walked:

"Jizi, tell me what you want to do. I am strong and can carry three buckets of water without eating."

"I found out when I pulled out potatoes last time. You have poor bones. Let me do any physical work in the future. I promise to do it for you quickly."

Wipe, you don't hit someone in the face.

Ning Fei had no expression on his face, and there was no fluctuation in his heart.

He pointed in the direction of the small fire room.

"Walk."

"Oh, good!"

Liu Tie didn't notice it at all, he cheerfully picked up the wooden barrel, and trotted all the way to the small fire room.

Xu Jin saw that this junior had a toothache.

He was planning to go to the dining room to wait for food, but seeing that Liu Tie was so short-sighted, he suddenly lost his mind.

He is someone who has watched his junior brother grow up, so he knows that what this kid said just now has no other meaning.

But you just say it, why are you pulling and stepping on it!

On the mountain, he could see that Juzi was very concerned about his physical problems, and now Liu Tie was still talking about it, it was like poking someone's foot!

Forget it, let's watch this stunned young man, lest he cause any trouble again!

Xu Jin talked to Yu Xin, and asked him to go to the dining room to help reserve two meals, and followed Ning Fei and Clay, walking all the way in the direction of the small fire room.

He wanted to help the silly junior brother explain a few words, but when he met the clear eyes of the young man, he couldn't say anything for a while, and finally he could only laugh and followed silently.

The small fire room is located on the edge of Wubao, and it is mealtime at this time, except for their group, there are no other Mozong disciples around.

Picking the quicklime into the door, Ning Fei asked Liu Tie to put all the powder in the bucket into a pottery jar, and then picked some water to mix it in.

"Be sure to add water slowly, and put it little by little close to the side of the tank."

He pointed to the clay pot and instructed Liu Tie.

"The reaction between quicklime and water will release heat, so be careful not to get hurt."

"Oh."

Liu Tie responded.

He can't wink, but he is very meticulous in his work.

After burning the stone for so many days, he also knew that this thing could hurt people, and the powder rubbed on his hands or face, and it was hot and painful.

Fortunately, Jizi had told him before that those who burned and transported stones should pay attention to protection, and do not get water on their bodies when the ash is rubbed on them, so there was no accident.

He picked up water and poured it into the jar little by little, keeping his hands motionless.

Ning Fei took a look and knew that there was no problem, so he stopped talking nonsense and started to explain the chemical reaction of quicklime.

"It's also a reaction."

He pointed to the pot and said to Xu Jin.

"Just like the kind of fried steel I told you on the mountain before, everything is not static. Under certain conditions, they will transform into each other and become something else."

"For example, this stone, we dug it from the mountain and then calcined it, not only to remove the impurities in the stone, but also to change its composition, from quicklime to lime. Liu Tie added water into it, The change happened again, and the lime became slaked lime, and this slaked lime with water is called milk of lime."

"Like the pig iron and wrought iron we burn when we forge?"

Xu Jin was at a loss when he heard it, and tried to explain it in a way he could understand.

Ning Fei shook his head.

"Not the same."

"The difference between pig iron and wrought iron is mainly the carbon content, but the change of lime is more thorough. If you have to say it, it means that the iron has rusted."

"But you need a furnace to heat the iron and blow air into it. This is the reaction."

Xu Jin scratched his head.

Those who forge iron wish they could not rust. They don't understand the use of a stick to make rust.

Just about to ask again, Yu Xin ran into the small fire room carrying five food boxes.The little boy ran with a red face, blinked his big eyes, and stared curiously at Liu Tie's pottery jar.

"Brother Xiaofei, what is this?"

Ning Fei was going to pick up his food box, but he dodged for a while.

"This one belongs to Brother Xiao Fei, this one belongs to Clay, these two belong to Brother Tie and Uncle Xu, and the younger one belongs to me."

Yuxin distributed the corresponding food boxes to everyone.Ning Fei opened it and looked, and found that his box was full of sauced meat

"Why so many?"

He looked at the remaining boxes, and found that Xu Liu was at a normal level, and the boxes of Clay and Yuxin were slightly smaller, but Clay got more meat than Xu and Liu. It was not because he was a child. And suffer.

It seems that Yu Xin got the least.So Ning Fei gave him some from his food box, Yu Xin quickly refused:

"Brother Xiaofei, I don't want it! I can eat enough of these."

"You need to eat more to grow your body."

Ning Fei simply grabbed the food box and filled it to the brim.

No matter how greedy he is, he won't grab the child's share. Yu Xin and Klei are about the same age, so they must have the same appetite.

Clay didn't say a word, and stuffed his mouth with food, without even looking at the fish on the opposite side.

After he finished his meal, he ran to Liu Tie to replace him.The child does not look strong, but the movement of pouring water is relatively stable, and the flow rate and flow are controlled very evenly.

Ning Fei saw it in his eyes and didn't speak, but secretly nodded in his heart.

"Okay."

He said to Clay, and got up and took out the wooden box containing the soda ash.

"Add this in."

After thinking for a while, he scooped out some milk of lime in the tank and filled a clay bowl.

"Add it now, sprinkle it a little bit, and be careful not to be splashed by the liquid inside."

Clay nodded, following Liu Tie's example, he carefully sprinkled the white powder into the small water tank.

Ning Fei handed the pottery bowl to Liu Tie, and under his blank gaze, the young Juzi slowly showed a malicious smile.

"In order to better demonstrate the process of change to you, we asked Brother Liu to cooperate with an experiment."

He paused, and looked Liu Tie up and down.

"No problem, brother Liu, this is hard work, can you make it?"

"It's done!"

Liu Tie put the food box aside, reached out and patted his chest.

"No problem, I'm tough, leave it to me!"

"Juzi, just tell me what you want to do?"

Ning Fei: ...

Ning Zaozi didn't want to answer this question, he turned his head to look at Xu Jin, and pointed to the water tank and pottery bowl.

"Uncle Xu, what Liu Tie and Clay will do next is different, but they can get the same result in the end, which is the transformation I mentioned earlier."

"Clay adds soda ash to lime milk, and Liu Tie directly blows carbon dioxide into lime milk to generate calcium carbonate. In fact, this substance is the main component of the stone before calcination. The reason why it takes so much effort is actually to Purification, the by-product caustic soda that has been reacted."

He said a long list, Xu Jin heard the mist in the clouds, but Yu Xin's eyes were bright, and his eyes jumped between the pottery bowl and the water tank from time to time.

"Brother Fei, you mean, whether we put white powder or blow air, we can all get the same thing in the end?"

"Yes."

Ning Fei gave him an approving look.

"It's not quite the same either, both methods give a white precipitate, but the remaining one is water and the other is liquid caustic soda."

He didn't know where to dig out a reed pipe, and handed it to Liu Tie who was listening dumbfounded.

"Come on, blow air into the bowl vigorously! Blow until white sediment appears inside, the more the better."

"okay!"

Liu Tie didn't know how powerful it was, so he sat on the ground holding the pottery bowl and blew violently.

Soon, the turbid lime water began to bubble. He felt that the work was not difficult, so he blew harder.

On the other side, Clay's water tank also reacted.Yu Xin was lying on the edge of the tank, watching the white sediment forming rapidly in the liquid, and couldn't help but widen his eyes.

"It really came out!"

"The white one is calcium carbonate, which has the same composition as the stone outside, but I need more pure raw materials for the toothpaste I want to use."

"toothpaste?"

Yu Xin asked curiously.

"What is toothpaste for?"

"It's for brushing your teeth."

Ning Fei looked at the situation in the water tank, and asked Liu Tie to pour the caustic soda solution in the tank into the cauldron on the stove, then wash the sediment in the tank with clean water, and send it to the kiln for drying.

"After drying, grind it, the finer the better."

"okay."

Xu Jin took the order and went.

Liu Tie here is still blowing lime water.

At first he thought it was an easy job, but it didn't take long for him to realize how powerful it was.

The two cheeks are sore and painful, and they will secrete some saliva from time to time, and it is easy to choke themselves if they are not careful.

Even so, his speed of blowing water is not as fast as that of a child throwing soda ash. The water tank over there has been emptied, and he is still holding the bowl desperately, blowing every mouthful until he gets a headache.

"Juzi, is that enough?"

Liu Tie asked with a bitter face.

"Okay."

Ning Fei showed the pottery bowl to Clay and Yu Xin.

"Look at the two of you, is it the same as the one in the water tank?"

The two children stretched out their heads, and then they nodded like chickens pecking at rice.

"Same and same."

"Can this white one be used as a toothpaste?"

Yu Xin suddenly hesitated, "Brother Xiaofei, can I not use it?"

Ning Fei raised an eyebrow.

"Why not?"

The young boy Yuxin glanced at Liu Tie, and twisted his fingers a little embarrassedly.

"I just saw Brother Tie blowing... he sprayed a lot of saliva. He often doesn't wash his face or chew salt, his saliva smells..."