[In the previous chapter, Qu Yuan Li should be Qu Yuan Li, Heng Yi made a mistake, and the chapter name couldn't be changed, so he simply didn't change it]

Yun Yuankai handed over the drawings of the Quyuan plough to the Yun craftsmen and ordered them to build the Quyuan plough as soon as possible, the more the better.

The structure of the Quyuan plough and the previous Sunda plough is basically wooden, only a small part is iron, and it is not difficult to build the Quyuan plow, and the materials are easy to obtain, so batches of Quyuan ploughs are baked.

Then Yun's took advantage of the arrival of the sowing season, began to promote the Quyuan plough in Yunhua County, compared with the Sun plough, the advantage of the Quyuan plough is very obvious, the Qu Yuan plough is light, can be pulled by manpower, which is simply great news for the farmers who have no money to buy ploughing cattle, and the Quyuan plough is lower than the Sun Da plow, which is more conducive to the promotion of the Quyuan plow.

All the farmers who have tried the Quyuan plow, have tried to raise money to buy the Quyuan plow, for a time the craftsman under the Yun family to create the Quyuan plough was snapped up, the farmers want to get the Quyuan plow, reclaim more land, although Yunhua County has a lot of poor land, but can not stand a large amount.

The appearance of Quyuan plough made most of the food crisis in Yunhua County dissipate, and Yun Yuankai no longer bothered about it.

However, Yun Yi still thought about those high-yield crops in his heart, so he drew three pictures, which depicted the appearance of corn, potatoes, and sweet potatoes, which Yun Yi had planted and harvested with his own hands, and was very familiar with them.

Then Yun Yi asked Yun Lang's printing house to print these three pictures in large quantities, and made a reward to the outside world, and anyone who found any of these three plants would receive a 1,000 gold reward.

Thousands of gold is definitely a huge wealth for ordinary people, countless ordinary people for the Yun family's bounty out of the house, into the deep mountains and old forests to find, as long as they find any kind of plant, then they will be rich, a thousand gold is enough for an ordinary family to live for five hundred years, this is an unimaginable wealth.

It didn't take long for the Yun Clan's bounty to spread from Yunhua County to other parts of Zezhou, and from Zezhou to other parts of the Dali Empire, many people ran around with three kinds of plants, and even some forces ordered the people below to help find it in order to make friends with the Yun Clan, if they could find it, then the auction that was about to start would definitely be very rewarding.

Time passed day by day, and there were no days left before the auction began, although there was no news that the three plants had been found, Yun Jie returned to Yunhua County with the approved documents, and Yun Yi thought the same, after the last incident, no one stopped Yun's documents, and the right servant of the household department was also replaced, no longer Tao Yuan.

The paperwork has been approved, and the iron ore can be mined.

The road connecting the iron ore mine had already been built enough to accommodate two horse-drawn carriages in parallel.

Although the iron ore mine has not been mined, some preparations have been completed, less than five miles from the iron mine is a steel plant, near the steel plant, there is also a cement plant and a masonry factory, the latter two factories have been established before the road is completed, and the production of cement and masonry has been started for more than a month.

It has long been known that the use of lime to build walls is that cement is just a little more advanced than lime, but it is not advanced anywhere, ordinary cement is easy to produce, and masonry factories are even simpler.

With the masonry produced by the masonry yard and the cement produced by the cement plant, the construction of the steel plant was greatly accelerated, and the clay blast furnaces made of masonry and cement were erected in the factory area.

Blast furnace ironmaking is a thing that has existed since ancient times, the predecessors knew that the establishment of soil blast furnace ironmaking, the collected iron ore into the earth blast furnace, and then add firewood below, the iron ore is burned and melted, and pig iron can be obtained.

Yunyi's iron and steel plant is also an earth blast furnace iron-making, but it is different from the soil blast furnace iron-making method that is now being tried, others are trying to heat firewood, while Yunyi's steel plant uses coal, and the temperature after coal combustion is much higher than charcoal, which greatly accelerates the efficiency of soil blast furnace ironmaking, and the soil blast furnace here is much larger than the soil blast furnace established by others, which means that each furnace produces more iron, all because of the emergence of coal.

Iron and steel millsIron and steel mills not only make iron but also steel, and if they are known by outsiders, they will think that their ears are broken.

This world also has a steel-making method, called block smelting, 100 steel-making is made by the block smelting method, the main thing is to increase the number of folding, forging, a piece of steel often needs to be burned, beaten, burned, repeated many times, or even hundreds of times, so it is called 100 steel, because a hundred steels can be produced very little, so 100 steels will only be used to build good weapons.

Because of the limited technical conditions, the steelmaking method tried by the iron and steel plant is called the steel filling method, that is, the wrought iron is used as the material iron, placed in the furnace, and the pig iron plate is placed at the furnace mouth, when the furnace temperature rises to about 1300 °C, the pig iron plate begins to melt, both the pig iron plate is clamped with tongs to move left and right, and the material iron is constantly turned, so that the material iron is evenly poured into the pig iron liquid, so that it can produce a good carburizing effect, and can produce a violent oxidation effect, so that the iron and slag are separated, and the steel with less slag and uniform composition is produced.

Under the existing conditions, the steel-filling method is the most suitable method for steelmaking, which can produce steel in large quantities.

In addition, mining is also an important problem, people in this era are mainly to collect surface outcrops or buried shallow veins, such veins are more convenient to collect, the use of hot water method when collecting ore, heat the rock with fire, so that the internal structure of the rock is damaged, sometimes the fire to heat the rock can also pour cold water or vinegar to make the rock crack under the action of thermal expansion and contraction, or become crisp under the action of vinegar, so that it is easy to obtain ore.

Of course, there are also underground ore veins, but relatively few, the iron ore found by Yunyi is buried underground, it is necessary to use vertical shafts, inclined shafts, and flat lanes to jointly develop ore veins to mine ore, and the steam engine has been manufactured, and the mining equipment powered by the steam engine is also being built, and when the mining equipment is completed, it can greatly improve the mining efficiency.

The official mines of the empire or the mines in the hands of other first-class nobles, because of the low technology of mining veins, can only use a large number of manpower, and it is common for thousands of people to work together in large mines, although the iron ore in Yunhua County will be greatly improved in terms of technology, and a large number of manpower is still needed.

Not only mining iron ore, but also steel mills, cement factories, and masonry yards all required a large number of people, and the Yun clan recruited a large number of laborers from the outside world, plus their families moved to the area near the iron mine, and a town of 1,000 people was quickly formed.

The paperwork for mining iron ore has been passed, and it didn't take long for the blast furnace of the iron mill near the iron mine to emit black smoke, and the steel mill will continue to smelt steel for Yunyi, and steel is the basis for Yunyi to build a steam industry.

Note 1: Iron with a carbon content of more than ?2% is pig iron, and iron with a carbon content of less than 0.04% is wrought iron, with a carbon content of 0.05~2%?

Between the iron is steel.