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

Blast furnace iron making method using low grade iron scrap Download PDF

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JP5277698B2
JP5277698B2 JP2008103033A JP2008103033A JP5277698B2 JP 5277698 B2 JP5277698 B2 JP 5277698B2 JP 2008103033 A JP2008103033 A JP 2008103033A JP 2008103033 A JP2008103033 A JP 2008103033A JP 5277698 B2 JP5277698 B2 JP 5277698B2
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iron scrap
grade iron
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JP2009249734A (en
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陽一 吉永
慶晃 西名
成治 榎枝
剛 坪根
敏勝 経塚
稔文 八幡
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JFE Steel Corp
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Description

本発明は、銅線などの非鉄分が混入した低品位の鉄スクラップ（低品位鉄スクラップ）を利用して高炉製鉄を行う、低品位鉄スクラップを利用した高炉製鉄方法に関するものである。   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.

従来から、廃自動車や建築廃材等に由来する鉄スクラップは、電炉製鉄法において、電炉での製鉄原料（鉄源）として利用されている。その際は、スクラップ工場で、廃自動車等を解体・破砕し、磁力選別機で鉄主体のスクラップ（鉄スクラップ）を選別回収した後、貯蔵や搬送に都合の良いように、所定の形状にプレス成形したり、裁断して結束したりして、出荷されている。そして、電炉工場では、入荷した鉄スクラップを解砕して、電炉に投入し、鉄源として利用している（例えば、特許文献１参照）。
特開平１０−１９５５１６号公報 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

近年、鉄スクラップの利用拡大の観点から、高炉製鉄法においても、高炉溶銑に鉄スクラップを混合し、転炉やトピートなどの精錬設備に投入して、製鉄原料（鉄源）として活用するようになってきた。   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.

しかし、従来に比べて大量に鉄スクラップを高級鋼材用の製鉄原料として用いる場合（例えば、転炉投入溶銑の１０％以上用いる場合、すなわち、転炉投入溶銑が３００トン／鍋の場合、鉄スクラップを３０トン以上用いる場合）には、従来は問題とならなかった鉄スクラップ中の銅線やプラスチック類などの非鉄混入物を十分に分離・除去して、高純度の鉄スクラップ（高品位鉄スクラップ）とする必要がでてきた。   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.

本発明は、上記のような事情を踏まえてなされたものであり、銅線やプラスチック類などの非鉄分が混入した低品位鉄スクラップを大量に利用して高級鋼材を効率よく製造することができる高炉製鉄方法を提供することを目的とするものである。   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.

上記課題を解決するために、本発明は以下の特徴を有する。   In order to solve the above problems, the present invention has the following features.

［１］製鉄所で高炉等と転炉を用いて製鉄を行う高炉製鉄方法において、低品位鉄スクラップから高品位鉄スクラップを製造する高品位鉄スクラップ製造工程と、高品位鉄スクラップを高炉等または／および転炉に投入する高品位鉄スクラップ投入工程とを備えていることを特徴とする低品位鉄スクラップを利用した高炉製鉄方法。   [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］高品位鉄スクラップ製造工程の前に、廃棄物を解体して低品位鉄スクラップを製造する低品位鉄スクラップ製造工程を備えていることを特徴とする前記［１］に記載の低品位鉄スクラップを利用した高炉製鉄方法。   [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］高品位鉄スクラップ製造工程の後に、高品位鉄スクラップを製鉄原料用に処理する高品位鉄スクラップ製鉄原料化工程を備えていることを特徴とする前記［１］または［２］に記載の低品位鉄スクラップを利用した高炉製鉄方法。   [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］高品位鉄スクラップ製造工程以降の工程を製鉄所内で行うことを特徴とする前記［１］〜［３］のいずれかに記載の低品位鉄スクラップを利用した高炉製鉄方法。   [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］高品位鉄スクラップ製造工程以前の工程を製鉄所外で行い、それ以降の工程を製鉄所内で行うことを特徴とする前記［１］〜［３］のいずれかに記載の低品位鉄スクラップを利用した高炉製鉄方法。   [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］高品位鉄スクラップ製造工程の後に、高品位鉄スクラップを粒度選別する高品位鉄スクラップ粒度選別工程を設け、該高品位鉄スクラップ粒度選別工程で大塊物に選別された高品位鉄スクラップは高炉等に投入し、小塊物に選別された高品位鉄スクラップは転炉に投入することを特徴とする前記［１］〜［５］のいずれかに記載の低品位鉄スクラップを利用した高炉製鉄方法。   [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］高品位鉄スクラップ製造工程では、低品位鉄スクラップを破砕機によって破砕・分離し、その破砕混合物を揺動反発式選別機によって重量物と軽量物と小径物とに選別・回収し、重量物として選別・回収された破砕物を磁力選別機によって磁性物と非磁性物に選別し、磁性物として選別・回収された破砕物を高品位鉄スクラップとすることを特徴とする前記［１］〜［６］のいずれかに記載の低品位鉄スクラップを利用した高炉製鉄方法。   [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].

なお、上記［１］〜［７］において、「高炉等」とは、転炉に溶銑を供給する設備を意味するものであり、高炉以外の溶解炉（例えば、シャフト炉）を含んでいる。   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.

本発明の高炉製鉄方法においては、銅線やプラスチック類などの非鉄分が混入した低品位鉄スクラップを大量に利用して高級鋼材を効率よく製造することができる。   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.

本発明の実施形態を図面に基づいて説明する。   Embodiments of the present invention will be described with reference to the drawings.

［実施形態１］
図１は、本発明の実施形態１に係る高炉製鉄方法の工程図である。 [Embodiment 1]
FIG. 1 is a process diagram of a blast furnace ironmaking method according to Embodiment 1 of the present invention.

図１に示すように、この実施形態１においては、低品位鉄スクラップを転炉用の原料として利用するものであり、次のような工程を備えている。   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）スクラップ工場において、廃自動車や建築廃材等の廃棄物を解体して、銅線やプラスチック類などの非鉄分が混入した低品位鉄スクラップ（例えば、銅が０．５％程度混入）を製造する低品位鉄スクラップ製造工程。   (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）低品位鉄スクラップ製造工程で製造された低品位鉄スクラップを製鉄所に輸送する輸送工程。   (S12) A transportation process of transporting the low-grade iron scrap produced in the low-grade iron scrap production process to the steelworks.

（Ｓ１３）製鉄所に輸送されてきた低品位鉄スクラップから銅線やプラスチック類などの転炉での製鋼に不適な非鉄分を選別・分離して、高品位鉄スクラップを製造する高品位鉄スクラップ製造工程。   (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）高品位鉄スクラップ製造工程で製造された高品位鉄スクラップを転炉用の製鉄原料に処理する高品位鉄スクラップ製鉄原料化工程。具体的には、高品位化スクラップを一時保管し（通常、製鋼原料ヤードに山積保管している）、転炉に投入する際に、必要に応じて、製鉄所で発生したスクラップとブレンド処理したり、投入量を調整したりする。また、転炉に大量投入しやすいように、必要に応じて、高品位鉄スクラップを塊状に成形する。   (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）高品位鉄スクラップ製鉄原料化工程で処理された高品位鉄スクラップを転炉に投入する高品位鉄スクラップ投入工程。   (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.

そして、転炉において、投入された高品位鉄スクラップと高炉等から供給された溶銑が合わさって溶鋼が製造される。   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.

［実施形態２］
図２は、本発明の実施形態２に係る高炉製鉄方法の工程図である。 [Embodiment 2]
FIG. 2 is a process diagram of a blast furnace ironmaking method according to Embodiment 2 of the present invention.

図２に示すように、この実施形態２においては、低品位鉄スクラップを高炉等用の原料として利用するものであり、次のような工程を備えている。   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）スクラップ工場において、廃自動車や建築廃材等の廃棄物を解体して、銅線やプラスチック類などの非鉄分が混入した低品位鉄スクラップ（例えば、銅が０．５％程度混入）を製造する低品位鉄スクラップ製造工程。   (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）低品位鉄スクラップ製造工程で製造された低品位鉄スクラップを製鉄所に輸送する輸送工程。   (S22) A transportation process for transporting the low-grade iron scrap produced in the low-grade iron scrap production process to the steelworks.

（Ｓ２３）製鉄所に輸送されてきた低品位鉄スクラップから銅線やプラスチック類などの高炉等での製銑に不適な非鉄分を選別・分離して、高品位鉄スクラップを製造する高品位鉄スクラップ製造工程。   (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）高品位鉄スクラップ製造工程で製造された高品位鉄スクラップを高炉等用の製鉄原料に処理する高品位鉄スクラップ製鉄原料化工程。具体的には、高品位化スクラップを一時保管し（通常、製鋼原料ヤードに山積保管している）、高炉等に投入する際に、必要に応じて、製鉄所で発生したスクラップとブレンド処理したり、投入量を調整したりする。また、高炉等に大量投入しやすいように、必要に応じて、高品位鉄スクラップを塊状に成形する。   (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）高品位鉄スクラップ製鉄原料化工程で処理された高品位鉄スクラップを高炉等に投入する高品位鉄スクラップ投入工程。   (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.

そして、高炉等において、投入された高品位鉄スクラップも利用して溶銑が製造され、転炉に供給される。   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.

［実施形態３］
図３は、本発明の実施形態３に係る高炉製鉄方法の工程図である。 [Embodiment 3]
FIG. 3 is a process diagram of a blast furnace iron making method according to Embodiment 3 of the present invention.

図３に示すように、この実施形態３においては、上記の実施形態１と同様に、低品位鉄スクラップを転炉用の原料として利用するものであるが、実施形態１とは、高品位鉄スクラップ製造工程を製鉄所外で行う点が異なっており、次のような工程を備えている。   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）スクラップ工場において、廃自動車や建築廃材等の廃棄物を解体して、銅線やプラスチック類などの非鉄分が混入した低品位鉄スクラップ（例えば、銅が０．５％程度混入）を製造する低品位鉄スクラップ製造工程。   (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）低品位鉄スクラップ製造工程で製造された低品位鉄スクラップから銅線やプラスチック類などの転炉での製鋼に不適な非鉄分を選別・分離して、高品位鉄スクラップを製造する高品位鉄スクラップ製造工程。   (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）高品位鉄スクラップ製造工程で製造された低品位鉄スクラップを製鉄所に輸送する輸送工程。   (S33) A transportation process for transporting the low-grade iron scrap produced in the high-grade iron scrap production process to the steelworks.

（Ｓ３４）製鉄所に輸送されてきた高品位鉄スクラップを転炉用の製鉄原料に処理する高品位鉄スクラップ製鉄原料化工程。具体的には、高品位化スクラップを一時保管し（通常、製鋼原料ヤードに山積保管している）、転炉に投入する際に、必要に応じて、製鉄所で発生したスクラップとブレンド処理したり、投入量を調整したりする。また、転炉に大量投入しやすいように、必要に応じて、高品位鉄スクラップを塊状に成形する。   (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）高品位鉄スクラップ製鉄原料化工程で処理された高品位鉄スクラップを転炉に投入する高品位鉄スクラップ投入工程。   (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.

そして、転炉において、投入された高品位鉄スクラップと高炉等から供給された溶銑が合わさって溶鋼が製造される。   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.

［実施形態４］
図４は、本発明の実施形態４に係る高炉製鉄方法の工程図である。 [Embodiment 4]
FIG. 4 is a process diagram of a blast furnace iron making method according to Embodiment 4 of the present invention.

図４に示すように、この実施形態４においては、上記の実施形態２と同様に、低品位鉄スクラップを高炉等用の原料として利用するものであるが、実施形態２とは、高品位鉄スクラップ製造工程を製鉄所外で行う点が異なっており、次のような工程を備えている。   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）スクラップ工場において、廃自動車や建築廃材等の廃棄物を解体して、銅線やプラスチック類などの非鉄分が混入した低品位鉄スクラップ（例えば、銅が０．５％程度混入）を製造する低品位鉄スクラップ製造工程。   (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）低品位鉄スクラップ製造工程で製造された低品位鉄スクラップから銅線やプラスチック類などの高炉等での製銑に不適な非鉄分を選別・分離して、高品位鉄スクラップを製造する高品位鉄スクラップ製造工程。   (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）高品位鉄スクラップ製造工程で製造された低品位鉄スクラップを製鉄所に輸送する輸送工程。   (S43) A transportation process for transporting the low-grade iron scrap produced in the high-grade iron scrap production process to the steelworks.

（Ｓ４４）製鉄所に輸送されてきた高品位鉄スクラップを高炉等用の製鉄原料に処理する高品位鉄スクラップ製鉄原料化工程。具体的には、高品位化スクラップを一時保管し（通常、製鋼原料ヤードに山積保管している）、高炉等に投入する際に、必要に応じて、製鉄所で発生したスクラップとブレンド処理したり、投入量を調整したりする。また、高炉等に大量投入しやすいように、必要に応じて、高品位鉄スクラップを塊状に成形する。   (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）高品位鉄スクラップ製鉄原料化工程で処理された高品位鉄スクラップを高炉等に投入する高品位鉄スクラップ投入工程。   (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.

そして、高炉等において、投入された高品位鉄スクラップも利用して溶銑が製造され、転炉に供給される。   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.

［実施形態５］
図５は、本発明の実施形態５に係る高炉製鉄方法の工程図である。 [Embodiment 5]
FIG. 5 is a process diagram of a blast furnace ironmaking method according to Embodiment 5 of the present invention.

図５に示すように、この実施形態５においては、低品位鉄スクラップを高炉用の原料、溶解炉用の原料、転炉用の原料として利用するものであり、次のような工程を備えている。   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）スクラップ工場において、廃自動車や建築廃材等の廃棄物を解体して、銅線やプラスチック類などの非鉄分が混入した低品位鉄スクラップ（例えば、銅が０．５％程度混入）を製造する低品位鉄スクラップ製造工程。   (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）低品位鉄スクラップ製造工程で製造された低品位鉄スクラップを製鉄所に輸送する輸送工程。   (S52) A transportation process for transporting the low-grade iron scrap produced in the low-grade iron scrap production process to the steelworks.

（Ｓ５３）製鉄所に輸送されてきた低品位鉄スクラップから銅線やプラスチック類などの製鉄に不適な非鉄分を選別・分離して、高品位鉄スクラップを製造する高品位鉄スクラップ製造工程。   (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）高品位鉄スクラップ製造工程で製造された高品位鉄スクラップを篩によって大塊物と小塊物に粒度選別する高品位鉄スクラップ粒度選別工程。   (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）高品位鉄スクラップ粒度選別工程で粒度選別された高品位鉄スクラップを製鉄原料に処理する高品位鉄スクラップ製鉄原料化工程。具体的には、高品位化スクラップを一時保管し、高炉、溶解炉、転炉に投入する際に、必要に応じて、製鉄所で発生したスクラップとブレンド処理したり、投入量を調整したりする。また、高炉、溶解炉、転炉に大量投入しやすいように、必要に応じて、高品位鉄スクラップを塊状に成形する。   (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）高品位鉄スクラップ製鉄原料化工程で処理された高品位鉄スクラップを高炉、溶解炉、転炉に投入する高品位鉄スクラップ投入工程。その際、高炉と溶解炉には大塊物が投入され、転炉には小塊物が投入される。   (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.

そして、高炉および溶解炉において、投入された高品位鉄スクラップも利用して溶銑が製造され、転炉に供給される。次に、転炉において、投入された高品位鉄スクラップと高炉および溶解炉から供給された溶銑が合わさって溶鋼が製造される。   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.

ちなみに、上記のおいて、大塊物と小塊物に選別する際の選別粒度（篩目の大きさ）は、高炉等と転炉での処理に応じて適宜定めればよいが、例えば、５０ｍｍにすればよい。   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.

なお、上記の実施形態１〜５において、高品位鉄スクラップ製造工程で製造された高品位鉄スクラップをそのまま高炉等または転炉に投入できる場合は、高品位鉄スクラップ原料化工程を設ける必要はない。   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. .

ここで、上記の実施形態１〜５における高品位鉄スクラップ製造工程の具体例を図６に基づいて説明する。   Here, the specific example of the high quality iron scrap manufacturing process in said Embodiment 1-5 is demonstrated based on FIG.

図６に示すように、廃自動車や建築廃材に由来し、銅線やプラスチック類等の非鉄分が混入した低品位鉄スクラッップを、ハンマ型破砕機１１によって、１００〜１５０ｍｍ程度の大きさの塊（中塊）に破砕する。その際に、ハンマ型破砕機１１では、複数のハンマが回転することにより、投入された低品位鉄スクラッップが破砕されるとともに、破砕物同士が摩滅して、鉄部分にハンダ付け接合していた銅線が外れる。これによって、鉄分と銅線とプラスチック類とが一体化していた鉄スクラップが、鉄分と銅線とプラスチック類とに破砕・分離される。   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.

この後、この破砕混合物（鉄分と銅線とプラスチック類とが混合）から鉄分を磁力選別することで、高純度スクラップ鉄を得ることができればよいが、破砕混合物では銅線が鉄分やプラスチック類に絡み付いており、そのままの状態では適切に磁力選別を行うことが難しい。   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.

そこで、破砕混合物を揺動反発式選別機（揺動回転式選別機）１３によって、重量物と軽量物と小径物とに選別・回収することで、鉄分やプラスチック類への銅線の絡み付きを無くしてから、磁力選別を行う。   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.

ちなみに、揺動反発式選別機１３は、クランク軸の回転により搭載物を傾斜上方に送るような揺動運動（振幅は３０ｍｍ以上）をする傾斜スクリーン上に被選別物を投入し、被選別物を構成する物体の重量、形状および硬度の差により傾斜スクリーン上で反発する弾道が異なることを利用して、被選別混合物を選別する形態選別装置であり、傾斜スクリーン上での跳ね返りが大きい重量物は傾斜スクリーンの傾斜下方に回収され、傾斜スクリーン上での跳ね返りが小さい軽量物は傾斜スクリーンの傾斜上方に回収され、傾斜スクリーンの篩目より小さい小径物は傾斜スクリーンの篩下に回収されるような構造になっている。   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.

したがって、このような揺動反発式選別機１３に、鉄分と銅線とプラスチック類とが混合した破砕混合物を投入すると、傾斜スクリーンの傾斜上方の軽量物側に、軽量プラスチックと銅線が回収され、傾斜スクリーンの篩下に、脆性プラスチック等の小径物が回収され、傾斜スクリーンの傾斜下方の重量物側に、鉄分と一部の非鉄混入物が回収される。   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.

そして、揺動反発式選別機１３で重量物側に回収された破砕物（鉄分と一部の非鉄混入物）を、磁力選別機１４によって、磁性物と非磁性物に選別する。   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.

これにより、磁力選別機１４で磁性物として選別された破砕物は、高純度な鉄スクラップ（高品位鉄スクラップ）となっており、高級鋼材用の製鉄原料として再利用することができる。   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.

なお、上記においては、ハンマ型破砕機１１によって低品位鉄スクラッップを鉄分と銅線とプラスチック類とに破砕・分離しているが、低品位鉄スクラッップを鉄分と銅線とプラスチック類とに破砕・分離できるものであれば、他の破砕機（例えば、ギロチン式破砕機）を用いてもよい。   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.

また、上記において、揺動反発式選別機で重量物側に回収された破砕物の鉄純度が良好であれば、その後の磁力選別機での選別を行わずに、そのまま高品位鉄スクラップとして使用することもできる。   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

本発明の実施形態１の工程図である。It is process drawing of Embodiment 1 of this invention. 本発明の実施形態２の工程図である。It is process drawing of Embodiment 2 of this invention. 本発明の実施形態３の工程図である。It is process drawing of Embodiment 3 of this invention. 本発明の実施形態４の工程図である。It is process drawing of Embodiment 4 of this invention. 本発明の実施形態５の工程図である。It is process drawing of Embodiment 5 of this invention. 本発明の実施形態における高品位鉄スクラップ製造工程の具体例を示す図である。It is a figure which shows the specific example of the high quality iron scrap manufacturing process in embodiment of this invention.

符号の説明Explanation of symbols

１１ ハンマ型破砕機
１３ 揺動反発式選別機
１４ 磁力選別機 11 Hammer type crusher 13 Swinging repulsive sorter 14 Magnetic sorter

Claims (6)

製鉄所で高炉等と転炉を用いて製鉄を行う高炉製鉄方法において、銅線とプラスチック類が混合した低品位鉄スクラップから銅線とプラスチック類が分離・除去された高品位鉄スクラップを製造する高品位鉄スクラップ製造工程と、高品位鉄スクラップを高炉等または／および転炉に投入する高品位鉄スクラップ投入工程とを備えていて、
高品位鉄スクラップ製造工程では、低品位鉄スクラップをハンマ型破砕機によって１００〜１５０ｍｍの大きさの塊に破砕・分離し、その破砕混合物を揺動反発式選別機によって重量物と軽量物と小径物とに選別・回収し、重量物として選別・回収された破砕物を磁力選別機によって磁性物と非磁性物に選別し、磁性物として選別・回収された破砕物を高品位鉄スクラップとすることを特徴とする低品位鉄スクラップを利用した高炉製鉄方法。 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. 高品位鉄スクラップ製造工程の前に、廃棄物を解体して銅線とプラスチック類が混合した低品位鉄スクラップを製造する低品位鉄スクラップ製造工程を備えていることを特徴とする請求項１に記載の低品位鉄スクラップを利用した高炉製鉄方法。 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. 高品位鉄スクラップ製造工程の後に、高品位鉄スクラップを高炉等用または／および転炉用の製鉄原料用に処理する高品位鉄スクラップ製鉄原料化工程を備えていることを特徴とする請求項１または２に記載の低品位鉄スクラップを利用した高炉製鉄方法。 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. 高品位鉄スクラップ製造工程以降の工程を製鉄所内で行うことを特徴とする請求項１〜３のいずれかに記載の低品位鉄スクラップを利用した高炉製鉄方法。   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. 高品位鉄スクラップ製造工程以前の工程を製鉄所外で行い、それ以降の工程を製鉄所内で行うことを特徴とする請求項１〜３のいずれかに記載の低品位鉄スクラップを利用した高炉製鉄方法。   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. 高品位鉄スクラップ製造工程の後に、篩を用いて高品位鉄スクラップを粒度選別する高品位鉄スクラップ粒度選別工程を設け、前記篩の上に選別された大塊物の高品位鉄スクラップは高炉等に投入し、前記篩の下に選別された小塊物の高品位鉄スクラップは転炉に投入することを特徴とする請求項１〜５のいずれかに記載の低品位鉄スクラップを利用した高炉製鉄方法。 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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