Lin Gao Qiming

Chapter 1314 Special Blast Furnace
In the end, the solution they decided was to use a blast furnace to smelt ferrosilicon, and then use a converter to smelt silicon steel.

He looked at the various plans on the table and stretched himself.From the window, you can see the soaring flames of No. [-] and No. [-] blast furnaces in the distance-these two large blast furnaces are a bit wasteful for smelting ferrosilicon.For this reason, the Planning Institute specially approved the project to build a small blast furnace in the Mayao Iron and Steel Company to refine ferrosilicon.

The "special" blast furnace is currently in the second oven. Compared with the 125 cubic meters of the No. 30 and No. [-] blast furnaces in Mayiao, the special blast furnace is miniature, only [-] cubic meters.However, because it is next to the No. [-] and No. [-] blast furnaces, the high-temperature waste gas output by these two blast furnaces can be fully utilized, especially the specially built large hot blast furnace.

These powerful conditions make it easy to raise the smelting temperature of the special blast furnace to a sufficient temperature.Ferrosilicon smelting requires a high temperature of over 1800°C, and hot air over 500°C must be blown continuously into the furnace body. This is a difficult condition for ordinary small blast furnaces. For groups, it's not a problem.

Now only after the oven is completed, the first furnace of ferrosilicon can be tested.The raw materials prepared for smelting ferrosilicon have also been transported successively: quartz sand, pig iron, coke... just waiting for the blast furnace to start and then the experimental refining can begin.

The phone on his desk rang suddenly, and he picked up the receiver. It was the supervisor on duty in front of the special blast furnace. He reported that the coke oven with intermittent blast had ended, and now he was starting to put in new coke. Carried out uninterrupted continuous blowing work.

"Very good, continue to run according to the worksheet." Ji Wusheng ordered.Before this, the oven had been working for 48 hours. Ji Silently looked at the schedule, and the first formal feeding would start in about 4 hours.He decided to go to sleep for a while: once the furnace was turned on, he would have to stare in front of the furnace for 24 hours.

Ji Wusheng woke up on time one hour before turning on the furnace. He washed his face and changed into work clothes. Several apprentice technicians he personally led were already waiting outside the office.

The apprentice technician is a young man with a little cultural background that he personally selected from the steelmaking workers of the Mariao Complex.Currently being trained as a monitor on duty, of course he will take on more important tasks in the future.

But good seedlings have lost a lot in frequent accidents.The veteran technicians are well aware of the dangers of working in front of the furnace, and generally try to avoid doing dangerous work in person, and will do a good job of prevention if they participate, but the natives who have just come into contact with the monster of modern industry in this time and space have no intuitive understanding at all.Many people have already turned into elements in green smoke and steel before they lived to be recognized by Ji Wusheng.

"Let's go." Ji Wusheng checked everyone's work equipment and said simply.In front of the office building, board the small commuter train running inside the steel complex and go to the blast furnace.

The Ma Niao Iron and Steel Consortium has begun to take shape, although in Ji Wusheng's view, this consortium is really shabby.But according to the standards of this time and space, it is already at the level of science fiction. The railroad tracks on the ground, the iron frames and pipes in the sky, and the chimneys are enough to make the aborigines who enter the factory for the first time feel horrified that they have entered a certain "devil world".

Ji Wusheng got off the car in front of the "site" of the No. [-] blast furnace—he wanted to check the new blast furnace that had been in production for less than a year.

No. [-] blast furnace was tapping iron, and with bursts of alarm bells ringing, a more than one-meter-long furnace flame burst out from the tapping hole, and the heat was overwhelming.The flames under the blast furnace are dazzling, and the hot molten iron in the furnace is tumbling and jumping, glowing with scorching light; the molten iron is poured out, splashing everywhere.The boiling boiler is like a "flaming mountain", spouting hot flames, and the molten iron in the furnace is like tumbling magma, with iron flowers splashing around from time to time.

Workers in the production workshop kept stirring the red hot molten iron, and their soaked clothes were stuck tightly to their backs.Standing in front of the blast furnace, the huge mouth spraying red flames 5 meters away continuously presses waves of heat, and with the sputtering of steel flowers from time to time, the surrounding air is also distorted.The outline of the blast furnace has long been engulfed by red hot flames, and even the steelworkers who are rising and falling next to them, waving stirring rods at work, seem to be drawn into the big mouth at any time.

Such a grand scene, even the old man felt thrilling when he was there, but it was commonplace for Ji Wusheng.The volume of the blast furnace in front of him is less than 1/4 of the blast furnace he worked in the old time and space.

Naturalized migrant workers work in front of blast furnaces with a temperature above 1600°C every day.The temperature in the workshop is as high as 55°C, and they work in this environment for 12 hours a day, taking turns to work day and night.Half of the time is spent in front of the high temperature furnace.To ensure safety, they wear protective equipment such as safety goggles, hard hats, large gloves, and thick stockings produced by Lingao.It is also necessary to wear thick canvas long-sleeved protective clothing, each of which is several pieces thicker than ordinary summer clothing.All of them were covered in black smoke.

But this whole-body defense is nothing more than resisting the splashing iron sparks, as long as there is a mistake, the sparks will be smashed out, and a piece of red iron bursting out is the same as a bullet, and it will be fatal if it hits a person. Level, it is impossible to cure the injuries caused by the work-related injuries in front of the furnace.

Ji Wusheng felt that beads of sweat had rolled down his forehead. The annual average temperature of the blast furnace workshop was over 40°C, and in summer it would reach over 60°C.

The taphole was sealed again.Furnace chief Zhao Youcai held a temperature measuring gun in both hands and quickly came to the front of the furnace to test the temperature of molten iron in the furnace.If the temperature is too high, he will add materials to the furnace; if the temperature is low, he will ask the blower room to increase the blowing.At this time, beads of sweat flowed out from under his safety helmet, and the protective clothing on his body was completely soaked.

Zhao Youcai came from Guangdong - he was not a refugee, but immigrated across the sea by himself.He used to work as a blacksmith in Shaoguan, but because of the business slump recently, he heard that Lingao needed a lot of blacksmiths, so he came here to join him.After entering the steelmaking plant, he worked as a front worker at the No. [-] blast furnace.

He has worked as an iron smith in earthen iron kilns in Shaoguan for more than ten years, and has accumulated rich experience; he can judge the approximate temperature by looking at the fire and smoke.Most of the old craftsmen who came from blacksmiths and ironworkers have such experience accumulation, but there are neither standards nor specific figures for this kind of experience accumulation.After arriving in Lingao, after systematic training and practice in front of the furnace, his experience has been systematically and theoretically sorted out-he is also a studious person, participated in the training class of the steel factory, and became a key worker.His sensitivity to temperature quickly entered Ji Silent's sight.After being his "apprentice technician" for a while, Zhao Youcai became the head of the No. [-] blast furnace.

"Chief—" Zhao Youcai hurried over to greet Ji Wusheng when he saw Ji Wusheng.

Ji Wusheng shook his hand: "How is it?"

"It's the second time for this class to cast iron. Everything is normal. Today's conversion rate is very good, I think it can exceed [-]." Zhao Youcai showed a proud smile on his face.

"Good job." Ji Wusheng nodded, "You first hand over the work in hand to the foreman on duty, and we will go to the special blast furnace."

Zhao Youcai went to go through the handover procedures, and Ji Wusheng looked around the blast furnace to see the production situation. Currently, the production status of the two blast furnaces and one open hearth furnace is relatively stable. Although it is limited to the material of the furnace body, the interval between minor repairs, intermediate repairs and major repairs is a bit short , but somehow maintained continuous production.It roughly meets the current industrial demand for steel.

However, the lack of special steel and the lack of profiles are still the main problems before him.Although the amount of steel produced is considerable, the production capacity of the steel rolling mills that process profiles is far from meeting the current industrial needs.No matter what company uses it, iron ingots and steel ingots cannot be used directly.

After solving the problem of silicon steel, we must try to produce some rolling mill equipment and expand the production scale of the rolling mill.Ji Silently calculated.

In front of the special blast furnace, the workers who participated in the trial work had already gathered.After the oven work was over, the workers were cleaning up the ashes and unburned coke ash in the furnace. Ji Silently watched the workers' operations and asked the foreman on duty:
"How's the hearth going?"

"Everything is fine and no damage was found."

Silently, Ji walked into the silo, where the raw materials for this trial had been prepared: coke, quicklime, pig iron that had been treated in advance to be in the shape of rods, and evenly crushed quartz sand.

Ji Wusheng knew that besides coke, quicklime, quartz sand and pig iron had all been tested by the heavy industry central laboratory and prepared according to the optimal ratio.These pig irons are specially purchased pig irons from Guangdong that have been desulfurized and dephosphorized before being treated.

The pig iron produced by our factory is not used because the Tiandu iron ore itself contains relatively high manganese, so the pig iron produced by Ma Niao's blast furnace also contains more manganese.

To smelt silicon steel and ferrosilicon, the manganese content is required to be less than 0.35%. Excessively high manganese content will affect the magnetic properties of silicon steel sheets.Not only that, silicon steel also requires as few impurities as possible, especially low carbon, low sulfur and low nitrogen.Therefore, it is necessary to control the content of harmful elements when preparing ferrosilicon in the first step.In this way, it is convenient to increase the yield rate when using converter steelmaking in the next step.

Ji Wusheng immediately ordered: "Start loading! Equipment is turned on!"

The workers began to fill the furnace with coke, and at the same time began to blow hot air into the furnace. With the increase of coke filled and the duration of the blast, the bottom of the furnace began to turn red, and the flame in the furnace gradually changed from red to white, and finally turned into white. It became a strong white flame light.Ji Wusheng could feel strong thermal radiation even standing on the observation platform.Workers began to add quicklime at a rate of 3-4% while adding coke.Add until two-thirds full.

(End of this chapter)