The next day is a rest day.

Wu Yanzhi got up very early, and today is his treat. He directly asked Gu Zhiwen to order the meals at the Dongjia Hotel in Xingjin Qiaotou and deliver them to his home. This kind of service was also provided in the big market of Liangjing in the Tang Dynasty. This was very convenient for those who held banquets at that time.

In the Tang Dynasty, large families generally held banquets at home, which were rare in wine shops, except for some special circumstances.

Dongguan Wu Youyi, Si Zhi Si Li Bochang, Si Bin Shaoqing Cui Shilian, Si Nong Shaoqing Zheng Wenlang, Tianguan Wailang Bai Feng and others all came on time.

Since it was a rest day, of course, Wu Yanzhi was arranging a day of reunion. There are two servants, Uncle Gu, who is Zhang Tai and Gu Zhiwen, to provide services, and they are just able to be busy.

Before leaving, Wu Yanzhi gave each person two jars of Jiannan Burning Spring High Liquor newly brewed by Xu Caixin, the price of this thing is ridiculously high now, not to mention, it may not be able to buy it.

Of course, the things given to Bai Yuanwailang are slightly different, and this is also to help Gu Zhiwen and the first.

……

The next day, after eating in the afternoon, he finished dealing with the affairs of the winter lawsuit, and then went to Shang Fangjian to arrange for Sun Heng to copy the list of dozens of craftsmen who were proficient in machinery and smelting for later use.

Then he was asked to select seven or eight craftsmen who were willing to follow him. Of course, the younger the better, and these people will be the main force in his research and development of machinery in the future.

Just as he had just finished arranging Sun Heng's affairs, Li Shaojiang, who would be the supervisor, personally asked him to check the construction of the cement furnace and the preparation of materials.

Without Wu Yanzhi's on-site command, they lacked confidence and couldn't handle it.

Can't figure it out? I guess I'm afraid of taking the responsibility for failure!

When he looked out the window, he felt that the sun was shining high, and the heat was unbearable.

After all, this Young Master Li is close to sixty years old, and he still has to accompany him to the scene!

Wu Yanzhi shook his head with a wry smile, and had to follow Li Shaojiang. Fortunately, someone in the division brought him an umbrella to support, but it was not too hot.

As he walked, he thought to himself, it seems that he will have to cultivate some talents in this area in the future, otherwise he will have to do everything himself, and he will not have to exhaust himself to death?

……

The cement kiln was built in the north of the city, not far from Zhang Shancai's brick kiln.

This cement kiln is the most primitive vertical kiln.

Wu Yanzhi studied metallurgical engineering with a master's degree, although he did not specialize in cement firing, but he still learned the basic knowledge of burning cement and ceramics in books! It's a lot easier than smelting steel.

As mentioned earlier, this burning cement, Wu Yanzhi uses the "vertical kiln dry cement" process. The main process is "two grinding and one burning".

1. After mixing and grinding limestone, clay and iron powder in a certain proportion, add pulverized coal and a certain amount of water to make a "raw meal ball" of about 10 mm.

2. Put this "raw meal ball" into the vertical kiln for firing, and at a certain high temperature, after a certain period of time, it will become more mature than the material. (Because pulverized coal is added to the raw meal, it will burn under the high temperature of the primer and the air to support combustion, resulting in a chemical reaction)

Of course, the raw meal balls of the vertical kiln must be discharged from the top and the clinker from the bottom.

3. Add clinker, gypsum, slag and other mixed materials to the ----- cement mill in proportion to ----- ground to obtain cement.

That's the whole process.

Of course, it is okay for air to be blown into the vertical kiln from the bottom and waist. The production of cement also requires a high level of technology, and it is important to control the combustion of the vertical kiln.

There is also the fact that it cannot be "stuck in the kiln", that is, the kiln is blocked, and it is also very difficult to deal with it.

Wu Yanzhi came to the scene to see that this was a cement kiln that was rebuilt from an old brick kiln.

The inner diameter is about five meters, the height is twelve or thirteen meters, and the refractory bricks lined inside are lined according to the requirements of Wu Yanzhi.

Because these craftsmen have the skills to fire porcelain and so on, it is not too troublesome to build a kiln.

I saw a number of workers, wearing straw hats, working hard under the scorching sun. The sweat towel on the neck was so wet that it couldn't be wetter anymore, and from time to time there were workers wringing out the sweat towel and continuing to wipe the sweat.

After all, there are many experts in smelting copper and iron, and there are experts in firing pottery, so these things are not a problem.

After Wu Yanzhi saw it, he felt that there was no problem.

"Wu Langzhong, I just want to ask Wu Langzhong to see what is wrong with this kiln?"

"Fortunately, it is necessary to pay attention to the flatness of the lining, I see that some places are not very smooth, why may it cause the kiln to be stuck, we must let them build it well!" The Way of Martial Arts.

"Hmmm! I'll let them rectify it right away! "After Li Shaojiang finished speaking, it needs to be corrected, after all, after the masonry is built, it will be very troublesome to correct it!" Li Shaojiang said. Immediately let a servant next to him go and call them to deal with it.

Wu Yanzhi looked around, and there was something missing, so he turned his head and asked, "Gong Li, why can't I see this grinding stone mill?" Is it not ready yet? ”

"Not really! Wu Lang didn't know that we planned to build ten large stone mills on top of the chan water, which was to use the water flow to push the mills, and there were still a few miles away from that place.

Now that the stonemasons have made three large stone mills, the waterwheel is also being processed, and there are more than 200 carpenters and stonemasons we have gathered, and it will be completed soon! Li Shaojiang said.

"Excellent! So how do you plan to make this finger-sized 'raw meal ball'? Wu Yanzhi asked. Raw meal balls are critical in firing cement.

If it is too large, it will not work, and the combustion will not be complete, which will affect the chemical reaction, and will also increase the probability of jamming.

"I've developed a mold, I've tried it many times, and I'm still improving, but it's still going to be used, there are two over there, Wu Lang, please move!" Young Craftsman Li led Wu Yanzhi to a workshop with a wooden shed next to him.

A craftsman named Li Shaojiang showed a mold to Wu Yanzhi and explained the basic principles to him.

Wu Yanyi looked at it, the design of this thing is not bad, it is made of pig iron, and it is similar to the principle of the machine that makes honeycomb coal by hand.

But the mold is split in half! After pressing, the mold is loosened, and the "raw meal ball" is formed.

Of course, the specific parameters of the molded "raw meal ball", such as moisture, particle size distribution, pressure resistance, bulk density, bulk porosity, etc., are not too important.

Wu Yanzhi knew that there were people who had no experience in firing cement in the experiment, and the quality of the cement in the early stage was definitely not good. But no, it's no problem to use it to pave the road!

Because the two main streets of Qitian Road and Dasheng Road, which Wu Yanzhi is going to build, are not accessible to cars. There are only most horse-drawn carts and ox carts, so the pressure on the road surface is not great.

The concrete is marked C10 to C15 is enough! Even C15 concrete is exceeded.

"Takerou! Is that you? A familiar voice came.

Wu Yanzhi looked back, wasn't that Zhang Shancai, who had fired zinc-smelting clay pots for himself?