Introduction and use of slag pots
The slag pots is a place where iron and slag are discharged. Modern blast furnace tapping facilities are equipped with mud guns (plugging machines), iron tapping machines, swing flutes, cranes, molten iron tanks, slag pots and other equipment. The mud cannon was originally pneumatic and later changed to electric. In the 1970s, the hydraulic mud cannon was used, with small size, large thrust, long life and easy maintenance. There are two types of iron-opening machines: electric and pneumatic. After the blast furnace molten iron flows into the molten iron tank, it is sent to the steelmaking plant by train. Blast furnaces above 2000 meters use 150 to 600 tons of molten iron tanks (torpedo-type mixed iron cars), and each time there are 2 to 3 cans of iron. The inclination angle of the swing flow iron groove is 1 ° to 4 °, and the inclination angle of the swing flow slag groove is 3 ° to 6 °. For modern blast furnace slag, flush the water slag in front of the furnace or set up a dry slag pit (see Utilization of blast furnace slag). The smoke was diffused when the iron was out of the iron yard. After the 1970s, most of the fans and bags were used to remove dust. After the dust and lead were recovered, the furnace dust could be used as raw materials for sintering or pellets. Some blast furnaces are also equipped with cast iron machines. There are two types of cast iron machines: roller type and fixed wheel type. The cast iron capacity is generally 200 to 300 tons / hour.
2.Principle of use
The slag pots is mainly used to carry converter steel slag, refining furnace steel slag, and continuous casting bale casting. Under the conditions of the converter smelting process, the temperature of the steel slag is higher than
The temperature of the molten steel (because the steel slag is located in the high temperature region of the oxygen blowing reaction). After the smelting process, whether it is the slag splashing protection process of the converter, or the inversion of the slag, etc., the liquid steel slag covering the surface of the molten steel The temperature has dropped, and theoretically such high temperature steel slag has the risk of melting through the slag pots. However, once the slag film is formed, and the cast steel material has the advantages of rapid heat absorption and fast heat conduction, the surface of the slag pots body continuously convects and radiates heat, so it will not cause the slag pots to become red and deformed due to rapid temperature rise. The temperature of the internal liquid steel slag is gradually reduced, so it is difficult to remelt the slag film, which fully guarantees that the slag pots has sufficient safety. Of course, if high temperature molten steel continues to enter the slag pots before the steel slag, its impact kinetic energy and high temperature will likely cause the slag tank to pass through the tank. On the other hand, if the steel slag enters the slag tank first, the risk of penetrating the tank is much smaller, which is also The technical principle of the cast steel slag tank can safely carry high temperature steel slag.
3.Influencing factors of life
- l Damage to the slag tank by external impact:
When the slag tank and the steel slag contained in the slag tank adhere to each other and cannot be turned over normally, continuous hitting with a gun car is required to help slag out of the slag pots. The mechanical force during the hitting process is in the form of a wave in the slag tank. Internal transfer, and superimposed locally, causing damage to the slag tank.
- l Impact of continuous casting of large packages:
In addition to a part of the steel slag, the continuous casting ladle also contains molten steel, both of which are higher than or close to the melting point of the cast steel. If the slag tank is not specially treated, the molten steel directly contacts the slag when the casting amount is large. The tank body may melt through the cast steel material of the slag tank body and cause penetration of the tank, or it may cause adhesive adhesion to the slag tank after partial melting and condensation, which is likely to cause damage to the slag tank when the tank is turned over.
- l Impact of converter slag:
Although the steel slag carried in the cast steel slag tank is safe, there is still a risk for the converter’s abnormal slag. The converter’s abnormal slag is mainly the slag washed before smelting and the high temperature and high iron oxide slag produced by smelting special steel. The cleaning of the furnace is to dissolve the slag splashing layer on the converter lining and the adhered slag and blast furnace slag through the high-temperature slag to facilitate the subsequent dismantling work. The generated steel slag is higher in temperature than the conventional slag, the iron oxide content in the slag is high, and the fluidity is good. After entering the slag tank, the iron oxide in the slag chemically reacts with the slag tank body. In addition, the temperature load of the slag itself will cause a tank penetration accident.
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