Qinjiazhuang, under the slope of the mountain.

More than a dozen large kilns are lined up in turn, smoking, the guards are busy sending coke and burning bricks to the kiln entrance, someone is not far away to transport stones, the site is cleared out of a large area for stacking, and there are people cleaning up the road, Jia Youcai is commanding everyone loudly, orderly and in full swing.

Qin Huaidao observed for a while, and after seeing that there was no problem, he put his mind at ease, and walked to the experimental kiln that was being dug, he had never done this kind of thing before, he judged and guided everyone to dig the kiln based on his feelings, and found some people to help smash big stones.

After the meal, Qin Huaidao came to the small kiln again, the kiln was empty, and he didn't know if the soil on the kiln wall would collapse, so he asked someone to help bring the waste bricks that had been burned before, and surrounded the kiln barrier to be reinforced, which could also play a role in blocking limestone and soil.

Then there is the kiln, there are more stones and it is easy to collapse, Qin Huaidao asked everyone to take the relatively flat big stone first, put it on both sides and behind the kiln mouth, install it about one meter high, leave some empty in the middle, let the stones be staggered and matched as much as possible, the big stone is pressure-resistant, and the flat stacking is not easy to fall, and the staggered anastomosis is not easy to move, and I don't know if I can't do it, I will do it first.

The empty part in the middle continues to be stacked with stones, building an inclined arch bridge, this space is the combustion chamber, similar to burning bricks, Qin Huaidao tried, the arch bridge is very stable, it should not collapse, so let everyone start stacking stones, try to keep the pores in the middle of each stone, facilitate air entry, and improve combustion.

There are many people, the kiln is small, it didn't take long to load, and the next thing is to burn, considering that the stone is easy to break and collapse due to burning too fast, and it is a new kiln, the kiln wall is all soil, the water vapor is heavy, and it is not strong enough, and the same as burning bricks, it also needs to have a process, dare not burn too fast, Qin Huaidao let everyone start a small fire.

The stakes are very high, Qin Huaidao personally stared at it, after burning for two days, he felt that it was almost over, the stones and kiln walls in the kiln had no signs of collapse, and they should be stable, so he began to fire in the middle of the fire, and he did not dare to fire directly, for fear of an accident, and it didn't take long to find that the hot gas at the kiln hat above the kiln overflowed and the temperature was lost.

The limestone in the kiln can not be controlled by temperature, so quickly find someone to help thicken the kiln hat mouth with soil to reduce heat loss, and find that the limestone in the kiln hat mouth is whitish on the fourth day, I don't understand whether this situation is good or bad, record it first, and wait until the evening to find that the limestone at the kiln hat mouth is dark red, indicating that the temperature has come up.

Qin Huaidao pondered that the limestone must be burned thoroughly, and the temperature must be maintained for a certain time, if it is too short, it will definitely not work, just like stewing bones, if you want to stew rotten, in addition to maintaining the temperature, you also have to have time, so let people continue to thicken the kiln hat mouth with clay, leaving only a small mouth to burst out of the flames, so as to facilitate the observation of the situation inside.

The mouth of the kiln hat was sealed, and the high temperature inside could not escape, so he could only stay in the kiln and whirl, and he didn't know if it was right or not, but Qin Huaidao found that the temperature was controlled in the kiln, and it was improving, so he quickly recorded it.

Observe for a while, worry that the temperature will not reach, the limestone can not be completely burned through, burned, began to increase the fire, from the kiln hat mouth to observe the changes inside, and gradually found that some of the limestone in the kiln hat mouth began to sink unevenly, the fire in the combustion chamber is dark, not bright enough, like the temperature is uneven.

Qin Huaidao has no experience, he feels bad, if the temperature is uneven, it means that some are burned through, and some are not burned through, it is estimated that it is caused by uneven ventilation of the kiln hat mouth.

Considering that the kiln door will also leak temperature, even the kiln door is sealed to ensure that the temperature is sealed and stabilized, and the worst is prepared in my heart, staying in the ancestral hall and not going anywhere, reviewing the firing process in the past few days, every link is recorded, and I am ready to dig two small kilns to try, I don't believe it.

A day later, Qin Huaidao didn't know if it was boring, he was going to take a look, everyone rushed to watch when they heard the news, and they all wanted to know if it could be fired successfully, Qin Huaidao asked everyone to open all the kiln hats, and the kiln door was also opened.

The temperature in the kiln is more than 1,000 degrees, and it takes a long time to let it go slowly, so Qin Huaidao asked everyone to expand the kiln hat every other hour and cool it in an orderly manner.

Until the next morning, the temperature was completely cooled, everyone gathered at the kiln again, Qin Huaidao asked everyone to dismantle the kiln, saw the lime full of kiln, and went up to check it in surprise, familiar color, familiar touch, familiar taste, heart is settled, a sense of accomplishment arises spontaneously.

Everyone didn't know what it was, what was the use, seeing Qin Huaidao's relaxed expression, they all breathed a sigh of relief, Jia Youcai asked curiously, "Young Master, is this a success?" What is it for? ”

"This is very useful, find a place to store it, remember, you must wear a mask to carry the things inside, wear two more layers, and move lightly, once these things get into the eyes and inhale into the body, it is very serious, who can help carry some water." Qin Huaidao shouted, limestone is very useful, but it is also very dangerous, we must make everyone aware of the seriousness, and we can't mess around.

The water was quickly brought up, Qin Huaidao grabbed some and threw them into the bucket, the water was bubbling and boiling, so frightened that everyone hurriedly retreated, thinking it was witchcraft.

"Do you see it, you must not let these limes enter your eyes, if you enter, you must not wash it with water, you can only break your eyelids and blow hard, then close your eyes, don't blink, and wait for natural recovery, do you write it down?"

"Remembered." Everyone looked at the bubbling water and had palpitations, so they quickly wrote it down.

"Okay, don't be afraid, as long as you don't get into your eyes and suck it in your mouth, it's okay for the rest, this thing is very useful, you will know in the future, from today onwards, dig a kiln to burn lime, in addition, I need to build a warehouse to store these things, Huang Lao." Qin Huaidao said and looked at Huang Lao.

"No problem, organize the staff immediately." Huang Lao agreed.

The quality of the warehouse is not high, it is used temporarily, just stir the lime and clay to be used as a binder, the wall is no problem at all, and the bricks have been burned a lot, Qin Huaidao found someone to help, and demonstrated on the spot, everyone saw that the bricks were built up, and they were very worried that they would collapse, this thing can be used?

In everyone's knowledge, this kind of brick wall must be made of glutinous rice mortar, that is, boiled with glutinous rice, poured the slurry into the Sanhe soil, and stirred with the sheep peach juice, the cost is extremely expensive, only the nobles and the court can afford to use it, this kind of stone burned ash plus clay can work?

It takes time to recognize new things, and it is very difficult to explain, Qin Huaidao said after building a short section of wall: "Do you see clearly? Just do this, find a vacant lot to dig the foundation, put stones under the foundation, pour mixed clay and crush it, and then build the wall with bricks. ”

"Arrange it right away." Huang Lao hurriedly agreed, no matter whether it is useful or not, the main thing is to do it, and it is enough to do it over there.

Soon, a large group of people were transferred over, first leveled out a large piece of open space, Qin Huaidao asked people to find a rope to straighten, compared to drawing a line with lime, everyone followed the line to dig the foundation, the warehouse did not need to be built too high, the foundation is about a foot wide, a foot deep enough is enough, put on a hard stone, the size matches, and then put the clay mixed with lime and step on it, you can build a wall on it.

The winter rain does not know when it will come, the lime is not suitable for the open air, we must hurry up, Qin Huaidao let people burn the fire on the spot, rush to work overnight, and guide everyone from time to time, the warehouse is only temporary, do not consider too beautiful, it is good to be strong, everyone does it quickly.