After instructing Fan Yuniang to go back to the villa first, Yin Qingfeng himself planned to wait until Li Shimin was ordered to be the crown prince before going back.

He tried his best to do more than a year, just for this day. Although the possibility of another accident is very small, he always feels more at ease when he hears it with his own ears.

The edict issued by Li Yuan was faster than he expected. On the third day after he came out of Pei Ji's mansion, which was the first day of the seventh year of Wude, Li Yuan personally read out the edict that Li Shimin was made the crown prince.

Let Ren Liu, who came to report the news, call Wang Xiongjian, and Yin Qingfeng asked Yuemei to prepare to pack her luggage. If Li Shimin didn't tell him tomorrow, she would set off the day after tomorrow.

"Really? We're going back to the villa, right? Wow~~~ That's great~~~"

Yuemei heard this and danced happily.

"Don't be happy for now. You can change into a knight outfit now. When the male salivation and the others arrive, the husband will take you out for a walk."

Yuemei rushed over, grabbed Yin Qingfeng's arm, raised her face and asked with a eager look: "Where are we going? East City or West City?"

Yin Qingfeng and she pressed their foreheads, "Neither, let's go to the north bank of the Wei River."

Yuemei tilted her little head, "Is it Wulingyuan?" She clapped her hands, "Yes~ Let's go and see where the emperors live."

"If they come and you haven't changed your clothes yet, I won't wait for you~~"

"Ah~~~My husband is bad~~" After a scream, Yuemei turned around and ran away.

After crossing Zhongwei Bridge, Yin Qingfeng took the lead in heading straight to Haochou County. Haochou County was later called Qian County and was famous for burying the tomb of a couple.

Regardless of whether Li Shimin would send Xu Jingzong to him, since he decided to build roads and canals, Yin Qingfeng decided to make the cement out.

Although Yin Qingfeng had never been to Qianxian, he was very impressed by the introduction of Qianxian limestone when he was reading the travel guide.

The limestone in Qianxian is hidden in the north, but most of them are buried below forty meters. Fortunately, there are also exposed on the surface, such as Wufeng Mountain, Qianling, Fangshan, Longyan and other places. Among them, the Wufeng Mountain Mine Area with the best industrial value is the Wufeng Mountain Mine Area, which is a high-quality ore.

Longyan Mountain is located in the middle of the Jishui River Basin, a tributary of the Wei River. It is surrounded by mountains and rivers, with beautiful pine and stones, and has a very good place. According to legend, this is the origin of Emperor Xuanyuan Huangdi, the ancestor of Chinese culture.

Yin Qingfeng's original intention was to build a kiln near Longyan to burn lime, but when he discovered a hot spring, he had to turn to Fangshan in the northeast.

After going around, I finally decided on an ideal place. The limestone on the hillside is easy to mine, and the flat ground below the slope is enough to build large-scale factories and residential areas. The river not far away can also provide production and living water.

With the confused Yuemei, Wang Xiongxian and others, the exhausted group rushed back to Chang'an before the city gate was closed.

Before he could enter the door, the servants who came forward reported that there were eunuchs in the palace waiting for him.

Yin Qingfeng, who was prepared, was somewhat surprised when he saw the eunuch surnamed Huang who looked happy. Because the eunuch said that the prince invited him and Yuemei to the East Palace for a dinner the next day.

After hearing this, Yin Qingfeng asked, "Apart from me, are there other guests?"

"That's what the little one can know."

After giving the passbook of the eunuch surnamed Huang a hundred-month, the uncle's housekeeper personally sent him out of the mansion.

When he returned to the house, he saw Xue Fanxing holding a red embroidered skirt on Yuemei, with more skirts scattered on the bed. Yin Qingfeng deliberately joked: "Does Yuemei want to be a bride?"

Xue Fanxing laughed when she heard this, and Yuemei gave him a blank look, "Don't pay attention to your husband, let's continue."

Yin Qingfeng blinked his eyes and turned into the study. Since Yuemei attached so much importance to this banquet, he would dress her up beautifully.

The skirt written by Yin Qingfeng has a normal upper arm and a small forearm. The waist position is slightly raised upward, and the overall skirt hem looks extra slender.

Yin Qingfeng wanted to design the neckline as a flat collar or a V-shaped collar, but Yuemei's body had just developed and there was no suitable necklace, so he had to change it to a round collar.

Only after Mrs. Zhao took the design draft to sew it, Yin Qingfeng had time to think about the purpose of Li Shimin's banquet.

Although he could understand Li Shimin's distrust of him, it was impossible to let go completely. Now that he heard that he was going to meet Li Shimin again, he felt a little resistant in his heart. However, he had to go.

Since he was going to go, he had to think about Li Shimin's purpose of using a banquet. Although the murderous intent in Li Shimin flashed into his mind, he was still sure that Li Shimin did not have the possibility or necessity to kill him now.

Since it is not the Hongmen Banquet, and after his wish is fulfilled, it should be a thank-you banquet and further tests.

Since these two possibilities are the two possibilities, Yin Qingfeng gave up his mind and prepared to give Li Shimin a gift.

After resting for a night, Yin Qingfeng invited the uncle butler, "Uncle, Qingfeng found a piece of land in Haochou County. Please buy it for your nephew and prepare some kiln workers..."

Because of Yin Qingfeng's return, the livelihood in the mansion became increasingly rich. Now that Li Shimin has become the crown prince, Yin Qingfeng's status has even increased. Therefore, the butler took the order without raising any questions.

When Yin Qingfeng returned to the city before, he brought back various notes hidden in the desk in the study, including cement production technology and required information.

The firing technology content of cement is not too high. In modern time and space, the cement industry is even the pillar industry of some townships.

Cement uses limestone and clay as the main raw materials, and is crushed, ground and ground into raw materials. It is fed into a cement kiln to calcinate the clay material, and added an appropriate amount of gypsum to grind it into fine.

Limestone is used in both cement and lime. In the eyes of unknown people, at least there is no heresy from the raw materials, which can greatly improve the confidentiality of cement production.

If it weren't for the construction of the canal, Yin Qingfeng planned to take out the cement technology in a few years. He proposed to Li Shimin to build roads and canals, which was entirely for the purpose of reassuring Li Shimin.

With his upcoming business development, the news that he holds huge amounts of wealth cannot be hidden from anyone. As the king of a country, Li Shimin would definitely be worried. There are still people among the people who are richer than the royal family. But now it seems that the result is counterproductive.

In Yin Qingfeng's notes, in addition to recording the pre-homogenization of raw materials, circular pile yards, raw material ratios, and the use of blast furnace slag, he also designed the graphics of the new lime kiln. The inspiration for his design came from Jingdezhen kiln.

Jingdezhen kiln is abbreviated as Zhen kiln. The shape of the kiln is like an egg, with high in front and low in the back, wide in front and narrow in the back. The top of the kiln is arc-shaped at the head of the kiln and gradually descends. The bottom of the kiln gradually tilts upward from the head of the kiln. A chimney is set at the end of the kiln.

Due to the reasonable structure of the kiln, the sealing property is good, thereby increasing the temperature in the kiln; another advantage of the kiln is that the available space is large, which can fully ensure the output of cement.

Considering that lime or cement will produce a lot of dust when firing, Yin Qingfeng connected a curved iron pipe at the chimney of the kiln, and the other end of the iron pipe will be connected back to the kiln head. In this way, the dust generated in production can be eliminated without wasting raw materials.

This iron pipe is like the iron tube of a honeycomb coal stove. If you find that it is silted from dust, you can also disassemble it and clean it when the work is stopped.

In addition to these, Yin Qingfeng designed a crushing device based on the actual situation: build a dam upstream of the river, and then erect a windmill on the shore downstream. The crushed limestone, iron ore, clay, etc. were placed on the stone mill for fine grinding.

After checking it several times, I felt that there was nothing wrong, so Yin Qingfeng began to think about what gifts to bring when going to the banquet.

The ancients attached great importance to the word "ritual".

Li is a standard of conduct - "Liberty is the sutra of heaven, the righteousness of earth, and the actions of the people."

Li is also a system. It not only has five rituals, six rituals, nine rituals, etc., but also established the Ministry of Rites during the Northern Zhou Dynasty.

The most important manifestation of etiquette in daily life is the four words "reciting etiquette and communion".

Modern people will find that many childhood friends, classmates and so on will gradually drift away. The surface interpretation is that those down-and-out friends are unwilling to interact with wealthy relatives and friends. The essence inside is that they cannot communicate with respect.

To give the simplest example: a person was invited to have a meal, yes. After being invited to have two meals, I feel embarrassed to go there. But what about the third meal? I can’t afford to invite him back, so I had to stop contacting him.

In the past, Yin Qingfeng went to see Li Shimin for a reason. But it was the first time for a formal banquet. According to etiquette, Yin Qingfeng could never go empty-handed.

In modern times, I took a bottle of wine, a cigarette, or a fruit basket and dealt with it. But in the Tang Dynasty, Yin Qingfeng really didn’t know what to bring.

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Sorry: I got the title wrong before. During the Tang Dynasty, the emperor's daughter was a princess, the prince's daughter was called the princess, and the prince's daughter was called the county lord. Therefore, the Xiangcheng mentioned earlier should be the county lord rather than the princess.
Chapter completed!