JP5277698B2 - Blast furnace iron making method using low grade iron scrap - Google Patents

Description

  The present invention relates to a blast furnace iron making method using low-grade iron scrap, in which blast furnace iron making is performed using low-grade iron scrap (low-grade iron scrap) mixed with non-ferrous components such as copper wires.

Conventionally, iron scrap derived from scrapped automobiles, building scraps, and the like has been used as an ironmaking raw material (iron source) in an electric furnace in the electric furnace ironmaking process. At that time, scrap cars are dismantled and crushed at a scrap factory, and iron-based scrap (iron scrap) is sorted and collected by a magnetic separator, and then pressed into a predetermined shape for convenient storage and transportation. It is shipped after being molded or cut and bound. And in an electric furnace factory, the received iron scrap is crushed, thrown into an electric furnace, and is utilized as an iron source (for example, refer patent document 1).
JP 10-195516 A

  In recent years, from the viewpoint of expanding the use of iron scrap, even in the blast furnace ironmaking process, iron scrap is mixed with blast furnace hot metal, and then used as a raw material for iron making (iron source) by introducing it into refining equipment such as converters and topies. It has become.

  However, when using a large amount of iron scrap as a raw material for high-grade steel production compared to the conventional case (for example, when using 10% or more of the molten iron charged in the converter, that is, when the molten iron charged in the converter is 300 tons / pan, High-purity iron scrap (high-grade iron scrap) by sufficiently separating and removing non-ferrous contaminants such as copper wire and plastics in iron scrap, which has not been a problem in the past. ) Has been necessary.

  The present invention has been made in view of the above circumstances, and high-grade steel materials can be efficiently produced using a large amount of low-grade iron scrap mixed with non-ferrous components such as copper wires and plastics. The object is to provide a blast furnace ironmaking method.

  In order to solve the above problems, the present invention has the following features.

  [1] In a blast furnace steelmaking method in which iron making is performed using a blast furnace or the like and a converter at an ironworks, a high-grade iron scrap production process for producing high-grade iron scrap from low-grade iron scrap and a high-grade iron scrap into a blast furnace or the like And / or a high-grade iron scrap charging process to be charged into a converter, and a blast furnace iron making method using low-grade iron scrap.

  [2] The low-grade iron scrap manufacturing method according to [1], further including a low-grade iron scrap manufacturing process in which waste is disassembled to produce low-grade iron scrap before the high-grade iron scrap manufacturing process. Blast furnace iron making method using iron scrap.

  [3] The above [1] or [2], further comprising a high-grade iron scrap iron making process for processing the high-grade iron scrap for iron making raw material after the high-grade iron scrap manufacturing process Blast furnace iron making method using low-grade iron scrap.

  [4] The blast furnace iron making method using low-grade iron scrap according to any one of the above [1] to [3], wherein the steps after the high-grade iron scrap manufacturing step are performed in an ironworks.

  [5] The low-grade iron according to any one of [1] to [3], wherein the process before the high-grade iron scrap manufacturing process is performed outside the steelworks, and the subsequent processes are performed inside the steelworks. Blast furnace iron making method using scrap.

  [6] A high-grade iron scrap graded by a high-grade iron scrap grain size sorting step after the high-grade iron scrap manufacturing process is provided, and a high-grade iron scrap grain size sorting process is provided. Is put into a blast furnace or the like, and the high-grade iron scrap selected as a small lump is put into a converter, using the low-grade iron scrap according to any one of the above [1] to [5] Blast furnace iron making method.

  [7] In the high-grade iron scrap manufacturing process, low-grade iron scrap is crushed and separated by a crusher, and the crushed mixture is sorted and recovered into heavy, light and small-diameter items by a rocking repulsive sorter. The crushed material sorted and collected as a heavy material is sorted into a magnetic material and a non-magnetic material by a magnetic separator, and the crushed material sorted and collected as a magnetic material is used as a high-grade iron scrap [1] ] A blast furnace ironmaking method using the low-grade iron scrap according to any one of [6] to [6].

  In the above [1] to [7], “blast furnace or the like” means equipment for supplying molten iron to the converter, and includes a melting furnace (for example, a shaft furnace) other than the blast furnace.

  In the blast furnace iron making method of the present invention, high-grade steel materials can be efficiently produced using a large amount of low-grade iron scrap mixed with non-ferrous components such as copper wires and plastics.

  Embodiments of the present invention will be described with reference to the drawings.

[Embodiment 1]
FIG. 1 is a process diagram of a blast furnace ironmaking method according to Embodiment 1 of the present invention.

  As shown in FIG. 1, in the first embodiment, low-grade iron scrap is used as a raw material for a converter, and includes the following steps.

  (S11) In a scrap factory, dismantle waste such as scrapped automobiles and construction waste, and dispose of low-grade iron scrap mixed with non-ferrous components such as copper wires and plastics (for example, about 0.5% copper) Low-grade iron scrap manufacturing process to manufacture.

  (S12) A transportation process of transporting the low-grade iron scrap produced in the low-grade iron scrap production process to the steelworks.

  (S13) High-grade iron scrap that produces high-grade iron scrap by sorting and separating non-ferrous components that are unsuitable for steelmaking in converters such as copper wires and plastics from low-grade iron scrap that has been transported to steelworks Manufacturing process.

  (S14) A high-grade iron scrap raw material production process for processing high-grade iron scrap produced in the high-grade iron scrap production process into a steelmaking raw material for a converter. Specifically, high-quality scrap is temporarily stored (usually in piles in the steelmaking raw material yard), and when it is put into the converter, it is blended with scrap generated at the steelworks as necessary. Or adjust the input amount. Further, high-grade iron scrap is formed into a lump as needed so that a large amount can be charged into the converter.

  (S15) A high-grade iron scrap charging process in which the high-grade iron scrap processed in the high-grade iron scrap iron making process is put into a converter.

  In the converter, molten steel is manufactured by combining the high-grade iron scrap that has been charged and the hot metal supplied from the blast furnace or the like.

[Embodiment 2]
FIG. 2 is a process diagram of a blast furnace ironmaking method according to Embodiment 2 of the present invention.

  As shown in FIG. 2, in the second embodiment, low-grade iron scrap is used as a raw material for a blast furnace or the like, and includes the following steps.

  (S21) In a scrap factory, dismantle waste such as scrapped automobiles and construction waste, and dispose of low-grade iron scrap mixed with non-ferrous components such as copper wire and plastics (for example, about 0.5% copper) Low-grade iron scrap manufacturing process to manufacture.

  (S22) A transportation process for transporting the low-grade iron scrap produced in the low-grade iron scrap production process to the steelworks.

  (S23) High-grade iron that produces high-grade iron scrap by sorting and separating non-ferrous components that are unsuitable for ironmaking in blast furnaces such as copper wires and plastics from low-grade iron scrap that has been transported to steelworks Scrap manufacturing process.

  (S24) A high-grade iron scrap raw material production process for processing the high-grade iron scrap produced in the high-grade iron scrap production process into an iron production raw material for a blast furnace or the like. Specifically, high-quality scrap is temporarily stored (usually stored in the steelmaking raw material yard), and when it is put into a blast furnace or the like, it is blended with scrap generated at the steelworks as necessary. Or adjust the input amount. Further, high-grade iron scrap is formed into a lump as needed so that it can be easily put into a blast furnace or the like in large quantities.

  (S25) A high-grade iron scrap charging process in which the high-grade iron scrap processed in the high-grade iron scrap production process is put into a blast furnace or the like.

  And in a blast furnace etc., hot metal is manufactured also using the high-grade iron scrap thrown in, and it is supplied to a converter.

[Embodiment 3]
FIG. 3 is a process diagram of a blast furnace iron making method according to Embodiment 3 of the present invention.

  As shown in FIG. 3, in this third embodiment, as in the first embodiment, low-grade iron scrap is used as a raw material for a converter, but the first embodiment is a high-grade iron. It differs in that the scrap manufacturing process is performed outside the steelworks, and it has the following processes.

  (S31) In a scrap factory, dismantle waste such as scrapped automobiles and construction waste, and then dispose of low-grade iron scrap mixed with non-ferrous components such as copper wire and plastics (for example, about 0.5% copper) Low-grade iron scrap manufacturing process to manufacture.

  (S32) A high-grade iron scrap is produced by selecting and separating non-ferrous components that are not suitable for steelmaking in converters such as copper wires and plastics from the low-grade iron scrap produced in the low-grade iron scrap production process. Quality iron scrap manufacturing process.

  (S33) A transportation process for transporting the low-grade iron scrap produced in the high-grade iron scrap production process to the steelworks.

  (S34) A high-grade iron scrap raw material production process for processing high-grade iron scrap that has been transported to the steelworks into a steelmaking raw material for a converter. Specifically, high-quality scrap is temporarily stored (usually in piles in the steelmaking raw material yard), and when it is put into the converter, it is blended with scrap generated at the steelworks as necessary. Or adjust the input amount. Further, high-grade iron scrap is formed into a lump as needed so that a large amount can be charged into the converter.

  (S35) A high-grade iron scrap charging process in which the high-grade iron scrap processed in the high-grade iron scrap raw material production process is loaded into the converter.

  In the converter, molten steel is manufactured by combining the high-grade iron scrap that has been charged and the hot metal supplied from the blast furnace or the like.

[Embodiment 4]
FIG. 4 is a process diagram of a blast furnace iron making method according to Embodiment 4 of the present invention.

  As shown in FIG. 4, in the fourth embodiment, low-grade iron scrap is used as a raw material for a blast furnace or the like, as in the second embodiment, but the second embodiment is a high-grade iron. It differs in that the scrap manufacturing process is performed outside the steelworks, and it has the following processes.

  (S41) In a scrap factory, dismantle waste such as scrapped automobiles and construction waste, and then dispose of low-grade iron scrap mixed with non-ferrous components such as copper wire and plastics (for example, about 0.5% copper) Low-grade iron scrap manufacturing process to manufacture.

  (S42) A high-grade iron scrap is manufactured by selecting and separating non-ferrous components suitable for iron making in a blast furnace such as copper wires and plastics from the low-grade iron scrap produced in the low-grade iron scrap production process. High-grade iron scrap manufacturing process.

  (S43) A transportation process for transporting the low-grade iron scrap produced in the high-grade iron scrap production process to the steelworks.

  (S44) A high-grade iron scrap raw material production process for processing high-grade iron scrap that has been transported to a steel plant into a steelmaking raw material for a blast furnace or the like. Specifically, high-quality scrap is temporarily stored (usually stored in the steelmaking raw material yard), and when it is put into a blast furnace or the like, it is blended with scrap generated at the steelworks as necessary. Or adjust the input amount. Further, high-grade iron scrap is formed into a lump as needed so that it can be easily put into a blast furnace or the like in large quantities.

  (S45) A high-grade iron scrap charging process in which the high-grade iron scrap processed in the high-grade iron scrap iron making process is input to a blast furnace or the like.

  And in a blast furnace etc., hot metal is manufactured also using the high-grade iron scrap thrown in, and it is supplied to a converter.

[Embodiment 5]
FIG. 5 is a process diagram of a blast furnace ironmaking method according to Embodiment 5 of the present invention.

  As shown in FIG. 5, in this fifth embodiment, low-grade iron scrap is used as a raw material for a blast furnace, a raw material for a melting furnace, and a raw material for a converter, and includes the following steps. Yes.

  (S51) In a scrap factory, dismantle waste such as scrapped automobiles and building waste, and dispose of low-grade iron scrap mixed with non-ferrous metals such as copper wire and plastics (for example, about 0.5% copper) Low-grade iron scrap manufacturing process to manufacture.

  (S52) A transportation process for transporting the low-grade iron scrap produced in the low-grade iron scrap production process to the steelworks.

  (S53) A high-grade iron scrap manufacturing process for producing high-grade iron scrap by selecting and separating non-ferrous components suitable for iron-making such as copper wires and plastics from low-grade iron scrap that has been transported to steelworks.

  (S54) A high-grade iron scrap particle size sorting step in which the high-grade iron scrap produced in the high-grade iron scrap production step is classified into large and small lump particles by a sieve.

  (S55) A high-grade iron scrap raw material production step of processing the high-grade iron scrap subjected to the particle size sorting in the high-grade iron scrap particle size sorting step into a steelmaking raw material. Specifically, when high-quality scrap is temporarily stored and put into a blast furnace, melting furnace, or converter, it can be blended with the scrap generated at the steelworks and the input amount can be adjusted as necessary. To do. Moreover, high-grade iron scrap is formed into a lump as needed so that it can be easily put into a blast furnace, a melting furnace, and a converter.

  (S56) A high-grade iron scrap charging process in which the high-grade iron scrap processed in the high-grade iron scrap iron making process is loaded into a blast furnace, a melting furnace, and a converter. At that time, a large lump is charged into the blast furnace and the melting furnace, and a small lump is charged into the converter.

  In the blast furnace and melting furnace, hot metal is also produced using the high-grade iron scrap that has been charged and supplied to the converter. Next, in the converter, the high-grade iron scrap that has been charged and the hot metal supplied from the blast furnace and the melting furnace are combined to produce molten steel.

  By the way, in the above, the sorting particle size (size of the sieve mesh) when sorting into large chunks and small chunks may be appropriately determined according to the treatment in the blast furnace and the converter, for example, What is necessary is just to be 50 mm.

  In Embodiments 1 to 5 described above, when the high-grade iron scrap produced in the high-grade iron scrap production process can be directly put into a blast furnace or the like or a converter, there is no need to provide a high-grade iron scrap raw material production process. .

  Here, the specific example of the high quality iron scrap manufacturing process in said Embodiment 1-5 is demonstrated based on FIG.

  As shown in FIG. 6, a low-grade iron scrap that is derived from scrapped automobiles and building waste and mixed with non-ferrous components such as copper wires and plastics is lumped by a hammer type crusher 11 to a size of about 100 to 150 mm. Crush into (medium). At that time, in the hammer type crusher 11, the plurality of hammers rotated, so that the low-grade iron scraps that were input were crushed and the crushed materials were worn away and joined to the iron portion by soldering. The copper wire comes off. As a result, iron scrap in which iron, copper wire, and plastics are integrated is crushed and separated into iron, copper wire, and plastics.

  After that, it is sufficient if high purity scrap iron can be obtained by magnetically sorting iron from this crushing mixture (mixed of iron, copper wire, and plastics). However, in the crushing mixture, copper wire is converted into iron and plastics. It is entangled, and it is difficult to properly select the magnetic force as it is.

  Therefore, the pulverized mixture is sorted and recovered into heavy, light, and small-diameter items by a rocking and repulsive sorter (oscillating and rotating sorter) 13 to entangle copper wires in iron and plastics. After eliminating, perform magnetic sorting.

  By the way, the swinging repulsive sorter 13 puts the sorting object on the tilting screen that swings (the amplitude is 30 mm or more) so as to send the mounted object upward by tilting the crankshaft. Is a form sorting device that sorts the mixture to be sorted by utilizing the difference in the trajectory repelled on the inclined screen due to the difference in the weight, shape and hardness of the object that constitutes the heavy object that has a large rebound on the inclined screen Is collected below the tilt of the tilt screen, and lightweight objects with small rebound on the tilt screen are collected above the tilt of the tilt screen, and small objects smaller than the mesh of the tilt screen are collected under the tilt screen. It has a simple structure.

  Therefore, when a pulverized mixture in which iron, copper wire, and plastics are mixed is put into such a swinging repulsive sorter 13, lightweight plastic and copper wire are recovered on the lightweight object side above the inclined screen. A small-diameter material such as brittle plastic is recovered under the screen of the inclined screen, and iron and some non-ferrous contaminants are recovered on the heavy material side below the inclined screen.

  Then, the crushed material (iron and some non-ferrous contaminants) collected on the heavy object side by the swinging repulsive sorter 13 is sorted into a magnetic substance and a non-magnetic substance by the magnetic separator 14.

  Thereby, the crushed material selected as the magnetic material by the magnetic separator 14 becomes high-purity iron scrap (high-grade iron scrap), and can be reused as an iron-making raw material for high-grade steel materials.

  In the above, the hammer grade crusher 11 crushes and separates the low grade iron scrap into iron, copper wire and plastics, but crushes and separates the low grade iron scrap into iron, copper wire and plastics. Any other crusher (for example, a guillotine crusher) may be used as long as it can be separated.

  In addition, in the above, if the iron purity of the crushed material collected on the heavy load side with a rocking repulsion sorter is good, it can be used as it is as high-grade iron scrap without further sorting with a magnetic sorter. You can also

It is process drawing of Embodiment 1 of this invention. It is process drawing of Embodiment 2 of this invention. It is process drawing of Embodiment 3 of this invention. It is process drawing of Embodiment 4 of this invention. It is process drawing of Embodiment 5 of this invention. It is a figure which shows the specific example of the high quality iron scrap manufacturing process in embodiment of this invention.

Explanation of symbols

11 Hammer type crusher 13 Swinging repulsive sorter 14 Magnetic sorter

Claims (6)

Manufactures high-grade iron scrap in which copper wire and plastics are separated and removed from low-grade iron scrap mixed with copper wire and plastics in a blast furnace iron making method that uses a blast furnace and a converter to make steel at an ironworks. A high-grade iron scrap manufacturing process, and a high-grade iron scrap input process that inputs high-grade iron scrap into a blast furnace or the like and / or a converter,
In the high-grade iron scrap manufacturing process, low-grade iron scrap is crushed and separated into 100 to 150 mm ingots using a hammer-type crusher , and the crushed mixture is oscillated and repelled by a repulsive sorter. The crushed material sorted and collected as a heavy material is sorted into a magnetic material and a non-magnetic material by a magnetic separator, and the crushed material sorted and collected as a magnetic material is made high-grade iron scrap. A blast furnace iron making method using low-grade iron scrap. The low-grade iron scrap manufacturing process for disassembling the waste and manufacturing the low-grade iron scrap in which the copper wire and the plastic are mixed is provided before the high-grade iron scrap manufacturing process. Blast furnace iron making method using the described low grade iron scrap. 2. A high-grade iron scrap iron making process for treating high-grade iron scrap for a blast furnace or the like and / or an iron making raw material for a converter after the high-grade iron scrap manufacturing process. Or a blast furnace iron making method using the low grade iron scrap described in 2.   The blast furnace ironmaking method using low-grade iron scrap according to any one of claims 1 to 3, wherein the steps after the high-grade iron scrap manufacturing step are performed in an ironworks.   The blast furnace iron making using low-grade iron scrap according to any one of claims 1 to 3, wherein the process before the high-grade iron scrap manufacturing process is performed outside the steelworks, and the subsequent processes are performed inside the steelworks. Method. After the high-grade iron scrap manufacturing process, a high-grade iron scrap particle size sorting process is provided to sort the high-grade iron scrap using a sieve. A blast furnace using low-grade iron scrap according to any one of claims 1 to 5, wherein the high-grade iron scrap of small lump selected under the sieve is put into a converter. Steel making method.

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