Vincent uttered an unfamiliar word.

It's the kind of word meaning that is clear, but the statement has never been seen before.

The lord often invents inexplicable words like this, and his subordinates are already somewhat immune.

"Blast furnace?" Ninia asked curiously, "How tall?"

"Twenty meters, if you don't say anything." Vincent said to himself, "Maybe you don't need to be so high at first, build an experimental small blast furnace to accumulate experience, and build a fifteen-meter level."

This is not an insignificant height, considering that the golem that made people feel desperate before was only a little more than ten meters high.

A tower-like iron-making furnace is beyond people's imagination, and even the dwarves who make a living from smelting do not believe that people can build furnaces so large.

Although a tall furnace can increase the amount of feed and iron output, too high will cause the blast capacity to keep up, the ore can not be fully reduced, and the quality of minerals and fuels will make blast furnace ironmaking only theoretically possible.

In the kingdom of the human race, there are still many places where iron is made from crucibles as furnaces...... The mountain dwarf's stove is not absolutely advanced, but it is definitely not bad.

But what should be done with an iron-smelting furnace as high as two golems?

"Isn't this taller than the Magic Tower?" La Niña asked, surprised, "That's amazing, how much ore and charcoal are in there......

The lord glanced at the magician with a surprised face, and a whim occurred in his heart.

The reason why coke is used in ironmaking is because in blast furnace ironmaking, coke can act as a reducing agent, heating agent and material column skeleton, and the use of coke instead of charcoal in ironmaking blast furnace can greatly increase the temperature and make it possible to make a large-scale blast furnace.

Coke can not only be added to the blast furnace, all kinds of combustible gases, limestone and oil can be added, but it still cannot shake the main position of coke.

"If you can use special fire-based magic, maybe you can do without coke?" Vincent said to La Niña in all seriousness, "Is there any fire magic available that can melt large amounts of iron ore into molten iron?"

In this age of omnipotence of magic, Vincent, although he has a heart for science, is also full of expectations for this inexplicable power because he can use magic himself.

Your magic level is average, but there are always powerful magicians who can bring surprises, such as using fire magic to raise the temperature of the furnace to more than 2000 degrees or something, it shouldn't be a difficult task, right?

Anyway, when fighting against the demon army, the forbidden spells of this group of magicians are more ruthless than one another, especially the most destructive fire magic, it is simply a thunder and earth, and it is indestructible everywhere it goes.

"Iron ore melts into molten iron...... That's at least the strength of a normal forbidden spell." After thinking about it carefully, La Nina replied cautiously, "At least it can only be performed by a fire mage at the level of a magister, and it requires the assistance of powerful magic weapons and potions, considering the casting time, not even many people in the High Academy of Magic can do it."

"Persistence aside, can a person cast spells outside the tower and precisely control the temperature inside?" Vincent asked again, "The Magister level is too hard to find, can you lower the standard appropriately?" Five

"Impossible, absolutely impossible." La Nina pointed at herself and said helplessly, "I'm not boasting, among the magicians of the Great Mage level, my fire magic is already beyond the ordinary level, but it can't melt metal at all."

Even if it is ordinary cast iron, it will take more than 1,500 degrees to melt.

The magic of a magician and a magician cannot be generalized, and in the case of extreme anger, La Niña's magic cannot destroy the golem, so it can be seen that what she said should be true.

"The temperature of the combustion zone in the blast furnace should be maintained at 2,000 degrees Celsius for a long time, and the temperature in other parts may be slightly lower, but it is not a ......temperature that the human body can bear," Vincent said here, and asked very seriously, "Can a magician continue to use fire magic in it, for example, for six hours at a time, and still be unharmed?"

This is no longer work, but demon torture, right?

La Niña shuddered and shook her head, expressing her disapproval of the lord's terrible thoughts.

"Fire magic

The strength may reach the level of melting metal, but it can't be burned for a long time, and it's not only a matter of mana reserves, but also mana consumption to protect against high temperatures. I haven't heard of anyone who can do this unless it's not human......

The speaker was unintentional, but the listener was intentional, and Vincent's heart flashed and his confidence was reinvigorated.

"In any case, the blast furnace had to be rebuilt, and the existing iron-making furnace was completely not up to the production requirements, so there was no room for improvement." Vincent gave the final order, "As for the steelmaking workshop, we don't have to wait for the molten iron from the blast furnace, but thanks to the traitor, we have scrap iron and scrap steel to use."

The so-called scrap steel, of course, refers to the golem that Iwasu spent two years to build, but because it was completely damaged, it can only be used as scrap metal now.

In fact, in addition to recycling scrap iron for re-refining, the dwarves themselves are not unable to use the existing technology to make steel, even if they do not reach the black technology such as converter electric furnaces, but their operation method is more similar to the ancient "steel frying method", which can continuously add various mineral powders to the semi-liquid pig iron and stir to continuously oxidize and detach the carbon, so as to control the carbon content of the iron.

After thousands of subsequent forging by the dwarven blacksmith and the operation of metaphysics, fried steel can be turned into a sharp weapon, or a hard armor, which is the envy of other races.

This is already a relatively powerful technological height in the Middle Ages, and in the absence of technological progress, it is also a reliable way to produce in this way.

But in the end, without iron production, it is all in vain.

Scrap steel can be slowly recycled, but the various supporting factories and iron-making blast furnaces at the source cannot wait, fortunately, these workshops can use various local methods to deal with it if they do not consider modern advanced technology.

According to Vincent's plan, first solve the supporting facilities, then break through the ironmaking technology, and finally concentrate on breaking through the bottleneck of steelmaking technology, so that the territory can enter the happy era of large-scale steelmaking.

Refractories are indispensable in the construction of blast furnaces, converters and steel-making furnaces, and refractory bricks are also in demand in other areas of the territory, such as glass, ceramics, boiler manufacturing, etc.

Making bricks and tiles is not a complicated technology, but the refractory materials that can meet the needs of the steel industry are not enough for the products produced by ordinary private brick kilns.

For example, in the blast furnace that Vincent expected, the working temperature of all parts of the main body is extremely high, among which the bottom temperature of the deposited molten iron and slag reaches more than 1800 degrees, the main part of the furnace belly and waist is about 500 to 1600 degrees, and even the upper part of the feeding furnace body has a high temperature of about 500 degrees.

With such high temperatures, it is an untouchable divine domain for ordinary creatures.

Moreover, the blast furnace makes iron for a long time, which will make all parts subject to the friction and impact of the furnace material and other mechanical effects, and the dust in the gas will continue to wash and wear the furnace body, coupled with the chemical erosion of various alkali metal oxide steam, carbon deposits, molten metal and slag, as well as the penetration of high-temperature molten iron and lead, ordinary masonry can not withstand it at all.

As soon as the plan came out, the dwarves were worried.