Blast furnace steelmaking, in fact, is far less difficult than people like, coke, refractories, additives, these problems, in fact, have been solved in the daimyo's blacksmith's workshop, now to do is to design the shape of the blast furnace, the way of laying refractory materials, and the discharge of a large amount of liquid molten steel and the problem of casting.

On the premise of not considering the cost, the final result can be obtained just according to the fuzzy shape provided by Zhao Xin.

Zhao Xin is not in a hurry, steelmaking is very important, but there is the existence of a famous blacksmith workshop, in a long period of time, there is no need to consider the problem of a large amount of steelmaking, in real estate, highways, and some other industrialized steel demand is not strong, a steelmaking plant with an annual output of 1.8 million tons, enough to support the use of the Northern Song Dynasty.

Well, what he has is time, try slowly.

In the laboratory, at least 100 attempts have been made for some models and the like, scientific test methods, reduced proportions, and sufficient manpower and funds, in fact, for the construction of steelmaking furnaces, there has been some accumulation, but because of Zhao Xin's obstruction, it has not been implemented in the Daimyo's Mansion.

Now, when it comes to its own territory, there is a huge territory of 20 square kilometers, and there are some basic factories.

The brick factory has been put into operation for more than 3 months, and now it is very stable, and the countless buildings of the Dinghai Navy are slowly produced with the support of the brick factory and the cement factory, at present, there are about more than 30,000 finished products, 300,000 are under construction, and next, the construction speed will be accelerated.

The design drawings of the 7-storey building have been taken out by Zhao Xin, and the small-scale blacksmith workshop is also doing the initial steel bar, using the cast-in-place floor slab of the reinforced concrete structure, and creatively using the method of combining steel bars, and forming a structure of slender steel pipes as if compiling, a large number of fishing nets, to protect no longer falling casually, these unheard of methods, but to ensure the safety of construction.

Solve the problem of iron, in fact, it is very easy to do this, whether it is a time pipe, or a steel pipe hoop, these are very low-tech content, as long as there is a general shape, it can be created.

The first building, which is the mansion of Dinghaihou in the future, to put it bluntly, is a place to deal with daily things, and the future positioning of the Dinghai Navy is a large-scale seaport city, mainly commercial and industrial, and Zhao Xin is also ready to create a management model that is very different from that of the Northern Song Dynasty.

In the future, the outward-looking, service-oriented management model will require sufficient office space and openness.

Large pavilions, mainly halls and service windows, Zhao Xin began to prepare with reference to the appearance of the administrative hall in later generations, and dispatched elite soldiers and strong generals to carry out the construction of such a 7-story building, and even for insurance, even the foundation was more than 5 meters.

The opening of buildings can expand the capacity of the city, and the population of one million is so huge in this era that it is impossible to reach a population density of more than 20,000 per square kilometer.

Ordinary main houses, even if they are a family, can have hundreds of square meters, plus commerce, palace construction and palace these places, one square kilometer can reach 4,000 people, which is already very terrifying.

In fact, the inner city of Kaifeng Province is almost 60 square kilometers, plus the outer city is more than 300 square kilometers, which can accommodate such a large population.

Dinghai is different from Bianliang, Bianliang has a flat terrain and can develop many territories, but Dinghai is so big, the future large-scale industry, intensive light industry, machinery production, all need to occupy a large amount of land, if it is not reasonably arranged, at that time, it will not be able to accommodate so much.

There is a lot of power in numbers, not to mention some professionals, and the start of the first large building has attracted a lot of people, but those are only superficial bustle.

After Zhao Xin informed the experienced masons of some methods for building buildings, he turned to the Iron Smelting Research Institute, which is the key point related to the future.

Most of the reason why the daimyo blacksmith workshop has such a large output is, in fact, manpower, when thousands of blacksmiths are concentrated, even if the production capacity of one blacksmith is not high, the final accumulation of the number is very large.

In New China, after the reform and opening up, the initial steel output increased significantly, that is, on the basis of the original smelter, the production capacity was increased, the input was increased, and the amount was used to win.

At the same time, when the per capita output of Japan and the United States reached more than 500 tons, China at that time only had 33 tons.

The backwardness of per capita production capacity represents the backwardness of technology and the improvement of consumption, in order to convert this, it took 30 years, and even to China's steel production, which is already the world's first, more than 50% of the world's output, the elimination of backward production capacity, increasing advanced production capacity, has always been the focus.

The steel-making furnace was the first step out, and refractory materials, something that had never been touched in the Northern Song Dynasty, were also produced in the brick factory.

Instead of using steel, refractory materials and shells, the steelmaking blast furnace was gradually erected, in which the overall image and the interior layout were carried out through a series of studies through small models, and now, according to the final draft of the design, the construction began, and a blast furnace with hope was erected on the side of the Dinghai Navy.

Zhao Xin and Niu Dali are soaking here almost every day, Niu Dali is making the final adjustments, and Zhao Xin is concerned that this steelmaking furnace that looks backward and less than 5 cubic meters is not very advanced in the era of large-scale steelmaking, let alone the later generations, less than 20 cubic meters, most of which are small blast furnaces that have been cut, but in this era, they are the most advanced.

It took half a month to build, adjust, and another week, and after Niu Dali's repeated inspections and no problems, the first furnace was opened.

For the first time, there was no direct smelting, just a simple burning, looking at the use of heat, as well as the exhaust gas and air blast, because there is a metal thermometer, which can detect the temperature at different positions, and when all the temperatures reach about 1500 degrees, it is the real success of this steelmaking furnace.

After such an adjustment, it took another 2 days, and after Niu Dali finally confirmed that there was no problem, he chose an auspicious day for the zodiac and began the smelting.

The iron ore that has been prepared for a long time, the ingredients that have been selected for a long time, and the additives placed in a fixed position, these have all been successful, and 80,000 catties of iron or steel have been produced at one time, which has never been thought of before.

Although, before his daily output had reached about 3,000 catties, it was in a lot of time, as well as with the cooperation of the surroundings, this thing called a small blast furnace by Zhao Xin was 80,000 at a time, at least equivalent to more than 30 blacksmiths, a day's workload, such efficiency, will inevitably give wings to the production of steel.

Because it is experimental, and it has been taken seriously, everything is the best, specially selected, high-quality iron ore, familiar recipes, fine coke, plus the control of at least 10 masters.

The blast furnace is not able to see the fire, the appearance of the thermometer facilitates their control, after evaluating all the internal temperature indicators, they have a simple operating procedure, as long as they follow this procedure, they will definitely be smelted.

glanced at Zhao Xin, himself, Niu Dali wanted Zhao Xin to organize a ceremony and open the steelmaking furnace, but Zhao Xin refused, he came to preside, when the coke was ignited little by little, from a small fire to a large fire, the internal temperature began to rise gradually.

First of all, the thermometer at the bottom began to change color, representing the temperature, reaching and exceeding 800 degrees, and then the top, layer by layer, the heat flowed in the steelmaking furnace at all costs, unlike the ordinary blacksmith table, no matter how sealed the blacksmith table, it could not hit the steelmaking blast furnace to this extent, which can be seen from the increase in temperature.

Even if it is a one-time completion of 80,000 catties of steel smelting, the amount of coke used is relatively large, but the temperature rises very quickly.

"Blowing!" Niu vigorously ordered.

The temperature of the bottom layer is close to about 1000 degrees, but the upper layer, the top layer has not yet reached 800 degrees, which is a key point of the previous experiment, if the temperature can not be reached, the quality of the smelting can not be guaranteed, before the daimyo blacksmith workshop, it has been proved that when the temperature is unbalanced, not only will there be waste, but also easy to increase the scrap rate.

A good blacksmith will stir-fry gradually to make the temperature moderate, but the blast furnace does not have this condition.

At the same time, with a habit of weighing about 40 tons, no one in this world can stir up.

This problem has plagued Niu Dali for a long time, until the emergence of Zhao Xin, Zhao Xin briefly introduced the concept of some convection, between hot and cold air, there will be convection, artificially create flow, so that the internal hot air moves, to ensure that each part is evenly heated, this, inject some air is a good choice.

This is also to lay the foundation for the future, as a large steel country in later generations, from the initial ordinary smelting, to the back of the oxygen blowing top, has gone through a course of several decades, but this technology is not complicated, even in the environment of the Northern Song Dynasty, chemical production of oxygen, is not particularly difficult.

Oxygen blowing top, there is no need for pure oxygen with higher precision, the concentration of oxygen can reach a certain amount, blowing in advance, now blowing is air, the future can be changed to oxygen, when the time comes, the efficiency will be significantly increased.

The fixed environment, with the convection environment, the oxygen content in the air is not high, but it also increases the speed of the reaction from the other side, especially the role of advanced catalysts, and the temperature in the entire steelmaking blast furnace rapidly balances and rises.

Niu Dali has a prediction for the blast furnace, but in reality, the effect of the blast furnace still surprised him, and the use of materials cannot be seen for the time being, but the efficiency is improved.

Originally, he estimated that to refine a furnace of steel, at least more than 3 hours, now, less than 1 and a half hours, has come to an end, this is a great thing, the next success or not, it depends on the effect of this furnace of steel, soon is the time for the completion of the fire, the release of molten steel, he is full of expectations for the result.