JP5303915B2 - Usage of used MgO-C brick - Google Patents
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- JP5303915B2 JP5303915B2 JP2007308005A JP2007308005A JP5303915B2 JP 5303915 B2 JP5303915 B2 JP 5303915B2 JP 2007308005 A JP2007308005 A JP 2007308005A JP 2007308005 A JP2007308005 A JP 2007308005A JP 5303915 B2 JP5303915 B2 JP 5303915B2
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- 239000011449 brick Substances 0.000 title claims description 72
- 239000002184 metal Substances 0.000 claims description 50
- 229910052751 metal Inorganic materials 0.000 claims description 50
- 238000000034 method Methods 0.000 claims description 21
- 239000011810 insulating material Substances 0.000 claims description 18
- 238000009628 steelmaking Methods 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 239000002893 slag Substances 0.000 description 27
- 229910000861 Mg alloy Inorganic materials 0.000 description 11
- 238000007670 refining Methods 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 229910000514 dolomite Inorganic materials 0.000 description 8
- 239000010459 dolomite Substances 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- 239000002994 raw material Substances 0.000 description 7
- 230000032258 transport Effects 0.000 description 7
- 238000005261 decarburization Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 4
- 229910001882 dioxygen Inorganic materials 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000010802 sludge Substances 0.000 description 4
- 238000004898 kneading Methods 0.000 description 3
- 238000007873 sieving Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 235000012255 calcium oxide Nutrition 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 235000020083 shōchū Nutrition 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
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- Processing Of Solid Wastes (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Description
本発明は、製鋼用の転炉などに内貼りされた使用済みＭｇＯ−Ｃ煉瓦の利用方法に関する。 The present invention relates to a method of using a used MgO-C brick that is attached to a steelmaking converter or the like.
溶銑に上吹きランスを介して酸素ガスを上吹きし、あるいは炉底に設置した羽口から酸素ガスを底吹きして、溶銑を脱炭精錬する製鋼用の転炉が知られている。耐スポーリング性及びスラグに対する耐食性に優れることから、転炉の内貼り煉瓦としてＭｇＯ−Ｃ煉瓦が広く使用されている。耐食性に優れるＭｇＯ−Ｃ煉瓦といえども、溶融状態のスラグと接触すると溶損する。内貼りされたＭｇＯ−Ｃ煉瓦のスラグによる溶損防止を目的として、転炉内の溶銑には、造滓材としてドロマイト（ＭｇＣＯ3・ＣａＣＯ3）あるいはこれを焼成して得られる軽焼ドロマイトなどのＭｇＯ含有物質が投入される。転炉内に生成されるスラグ中のＭｇＯ濃度を飽和溶解度に維持することで、ＭｇＯが内貼りされたＭｇＯ−Ｃ煉瓦からスラグ中に溶出するのを防止することができる。 2. Description of the Related Art A steelmaking converter is known in which oxygen gas is blown up to hot metal through an upper blow lance or oxygen gas is blown from a tuyere installed at the bottom of the furnace to decarburize and refine the hot metal. MgO-C brick is widely used as an internal brick for converters because of its excellent spalling resistance and corrosion resistance against slag. Even MgO-C bricks, which have excellent corrosion resistance, will melt when they come into contact with molten slag. For the purpose of preventing melting damage due to slag of MgO-C bricks attached to the inside, dolomite (MgCO 3 · CaCO 3 ) or light-burned dolomite obtained by firing this is used as the ironmaking material in the converter Of MgO-containing material. By maintaining the MgO concentration in the slag generated in the converter at the saturation solubility, it is possible to prevent the MgO from being eluted into the slag from the MgO-C brick with the inner paste.
このような操業であっても、内貼りされたＭｇＯ−Ｃ煉瓦もやがては損耗し、所定の厚みが確保できなくなる。ＭｇＯ−Ｃ煉瓦の厚みが確保できなくなったとき、内貼りされたＭｇＯ−Ｃ煉瓦は解体され、新品のＭｇＯ−Ｃ煉瓦が新たに内貼りされる。解体されたときに発生する使用済みのＭｇＯ−Ｃ煉瓦は、その表面に地金が付着したり、内部に地金、酸化鉄、スラグなどが浸潤するために、そのほとんどが産業廃棄物として埋立処理などされてきた。 Even in such an operation, the MgO—C bricks that are attached to the inside will eventually wear out, and a predetermined thickness cannot be ensured. When the thickness of the MgO-C brick cannot be secured, the internally bonded MgO-C brick is disassembled, and a new MgO-C brick is newly applied. Most of the used MgO-C bricks that are generated when demolished are landfilled as industrial waste due to the adhesion of bullion to the surface and infiltration of bullion, iron oxide, slag, etc. Has been treated.
しかし、近年、回収費や運搬費などが高揚することから、廃棄処分するにも処理コストが高くなってきている。そのうえ、処分場を確保することも困難になってきている。このため、使用済みＭｇＯ−Ｃ煉瓦を有効活用する方法が提案されている。 However, in recent years, collection costs and transportation costs have increased, and therefore processing costs have increased for disposal. In addition, it is becoming difficult to secure a disposal site. For this reason, a method for effectively using the used MgO-C brick has been proposed.
特許文献１には、使用済みＭｇＯ−Ｃ煉瓦を粉砕し、溶銑を転炉に装入する前に使用済みＭｇＯ−Ｃ煉瓦を転炉に投入する使用済みＭｇＯ−Ｃ煉瓦の利用方法が開示されている。この利用方法において、使用済みＭｇＯ−Ｃ煉瓦は、ドロマイトあるいは焼成ドロマイトの代替物として利用される。 Patent Document 1 discloses a method of using used MgO-C bricks in which used MgO-C bricks are pulverized and used MgO-C bricks are charged into the converter before the molten iron is charged into the converter. ing. In this utilization method, the used MgO-C brick is utilized as an alternative to dolomite or fired dolomite.
特許文献２には、使用済みＭｇＯ−Ｃ煉瓦を粉砕し、使用済みＭｇＯ−Ｃ煉瓦を焼結原料のＭｇＯ源として利用する使用済みＭｇＯ−Ｃ煉瓦の利用方法が開示されている。 Patent Document 2 discloses a method of using used MgO-C bricks by pulverizing used MgO-C bricks and using the used MgO-C bricks as a source of MgO as a sintering raw material.
特許文献３には、使用済みＭｇＯ−Ｃ煉瓦を粉砕し、使用済みＭｇＯ−Ｃ煉瓦を電気炉における副原料の一部として利用する使用済みＭｇＯ−Ｃ煉瓦の利用方法が開示されている。 Patent Document 3 discloses a method for using used MgO-C bricks in which used MgO-C bricks are pulverized and used MgO-C bricks are used as a part of an auxiliary material in an electric furnace.
特許文献４には、使用済みＭｇＯ−Ｃ煉瓦を粉砕し、使用済みＭｇＯ−Ｃ煉瓦を電気炉における造滓材として利用する使用済みＭｇＯ−Ｃ煉瓦の利用方法が開示されている。
特許文献１〜４に記載の使用済みＭｇＯ−Ｃ煉瓦の利用方法はいずれも、使用済みＭｇＯ−Ｃ煉瓦を高価なＭｇ合金（ＭｇＯ）の代替原料として利用するものである。しかし、ＭｇＯ−Ｃ煉瓦はもともと耐火物として利用されたものであるから、保温材としての機能も持つ。Ｍｇ合金の代替原料としてだけでなく、保温材としても利用できれば、使用済みＭｇＯ−Ｃ煉瓦のより一層の有効利用が図れる。 In any of the utilization methods of the used MgO-C bricks described in Patent Documents 1 to 4, the used MgO-C bricks are used as an alternative raw material for expensive Mg alloy (MgO). However, since the MgO-C brick was originally used as a refractory, it also has a function as a heat insulating material. If it can be used not only as an alternative raw material for the Mg alloy but also as a heat insulating material, the used MgO-C brick can be more effectively used.
そこで本発明は、Ｍｇ合金の代替原料としてだけでなく、保温材としても利用できる新たな使用済みＭｇＯ−Ｃ煉瓦の利用方法を提供することを目的とする。 Then, this invention aims at providing the utilization method of the new used MgO-C brick which can be utilized not only as a substitute raw material of Mg alloy but as a heat insulating material.
上記課題を解決するために、請求項１に記載の発明は、高炉から製鋼工場まで溶銑輸送容器で溶銑を輸送する際に、粉砕された使用済みＭｇＯ−Ｃ煉瓦を保温材として溶銑輸送容器に投入し、溶銑を保温し、製鋼工場において、保温材として利用した使用済みＭｇＯ−Ｃ煉瓦を転炉に装入する使用済みＭｇＯ−Ｃ煉瓦の利用方法である。 In order to solve the above-mentioned problems, the invention described in claim 1 is directed to a hot metal transport container using as a heat insulating material crushed spent MgO-C bricks when transporting hot metal in a hot metal transport container from a blast furnace to a steelmaking factory. This is a method of using used MgO-C bricks, in which the molten MgO-C bricks used in the steelmaking factory are used as heat insulating materials in a converter .
請求項２に記載の発明は、請求項１に記載の使用済みＭｇＯ−Ｃ煉瓦の利用方法において、前記使用済みＭｇＯ−Ｃ煉瓦は、粉砕された後、所定粒径未満に分級されることを特徴とする。 The invention according to claim 2 is the utilization method of the used MgO-C brick according to claim 1, wherein the used MgO-C brick is classified to less than a predetermined particle size after being pulverized. Features.
溶銑を溶銑輸送容器で輸送する際、溶銑の温度降下を防止するために、従来は焼籾あるいはペーパースラッジ等で溶銑の表面を覆っていた。本願発明によれば、粉砕された使用済みＭｇＯ−Ｃ煉瓦を溶銑輸送容器に投入することで、使用済みＭｇＯ−Ｃ煉瓦を保温材として有効利用することができる。しかも、製鋼工場において、保温材として利用した使用済みＭｇＯ−Ｃ煉瓦を排滓することなく、転炉に装入することで、高価なＭｇ合金の代替原料として利用することができる。 In order to prevent the temperature drop of the hot metal when the hot metal is transported in the hot metal transport container, conventionally, the surface of the hot metal was covered with shochu or paper sludge. According to the present invention, the used MgO-C brick can be effectively used as a heat insulating material by putting the crushed used MgO-C brick into the hot metal transport container. In addition, it can be used as an alternative raw material for an expensive Mg alloy by charging a converter without using the used MgO-C brick used as a heat insulating material in a steelmaking factory.
以下添付図面に基づいて、本発明の使用済みＭｇＯ−Ｃ煉瓦の利用方法の一実施形態を説明する。まず、製鉄所で使用されている製鋼用の転炉などから発生する使用済みＭｇＯ−Ｃ煉瓦を回収する。ＭｇＯ−Ｃ煉瓦である限り、煉瓦中のＭｇＯ含有量及び炭素含有量が異なっていても、分別して回収する必要はなく、まとめて回収してよい。使用済みＭｇＯ−Ｃ煉瓦には、その表面に地金やスラグが付着したり、地金やスラグと接触して変質したりする部分が存在してもよい。本実施形態では、最終的に使用済みＭｇＯ−Ｃ煉瓦を転炉のスラグの成分調整用として利用するので、地金やスラグが付着していても、また変質部が存在していてもスラグ組成には何ら支障とならないからである。したがって、地金やスラグ及び変質部を選別・除去する必要はなく、そのまま粉砕して構わない。ただし、付着物のために粉砕作業が阻害される場合には、付着物を除去する。 An embodiment of a method for using a used MgO-C brick according to the present invention will be described below with reference to the accompanying drawings. First, used MgO-C bricks generated from a steelmaking converter or the like used in steelworks are collected. As long as the MgO-C brick is used, even if the MgO content and the carbon content in the brick are different, there is no need to collect them separately, and they may be collected together. In the used MgO-C brick, there may be a portion where a metal or slag adheres to the surface thereof or changes in quality due to contact with the metal or slag. In this embodiment, since the used MgO-C brick is finally used for adjusting the component of the slag of the converter, the slag composition even if the metal or slag adheres or the altered portion exists. This is because there is no hindrance. Therefore, it is not necessary to sort and remove the metal, slag, and altered portion, and they may be crushed as they are. However, if the crushing operation is hindered by the deposits, the deposits are removed.
次に、回収した使用済みＭｇＯ−Ｃ煉瓦をジョークラッシャ、ロールクラッシャなどの粉砕機で粉砕する。そして、図１に示されるように、目開き寸法が例えば５ｍｍの篩分機を用いて、５ｍｍ〜３０ｍｍの大粒径のＭｇＯ−Ｃ煉瓦と、５ｍｍ未満の小粒径のＭｇＯ−Ｃ煉瓦とに分級する。大粒径のＭｇＯ−Ｃ煉瓦は、転炉に投入され、ドロマイトあるいは焼成ドロマイトの代替原料として利用される。小粒径のＭｇＯ−Ｃ煉瓦は、溶銑輸送容器の保温材として利用される。なお、篩分機の目開き寸法は特に限定されるものでなく、例えば２．５ｍｍでもよい。 Next, the collected used MgO-C brick is pulverized by a pulverizer such as a jaw crusher or a roll crusher. Then, as shown in FIG. 1, using a sieving machine with an opening size of 5 mm, for example, a large particle size MgO—C brick of 5 mm to 30 mm and a small particle size MgO—C brick of less than 5 mm Classify. The large particle size MgO-C brick is put into a converter and used as an alternative raw material for dolomite or calcined dolomite. The small-sized MgO-C brick is used as a heat insulating material for the hot metal transport container. The opening size of the sieving machine is not particularly limited, and may be 2.5 mm, for example.
高炉から出銑された溶銑は、転炉で脱炭精錬される前に、溶銑予備処理と呼ばれる脱硫処理及び脱燐処理が施される場合が多い。溶銑の珪素含有量が高いとき、脱燐反応が阻害される。脱燐処理を効率的に行うために、脱燐処理に先立って脱珪処理を行う場合もある。この脱珪処理も溶銑予備処理の一つである。高炉の装入原料や操業条件によって溶銑成分には変動があり、必ずしも次の製鋼過程に適した成分組成であるとは限らない。製鋼段階で要求される溶銑の成分組成は、最終の溶鋼の目標成分組成や製鋼工程、生産能率などによって異なってくる。そこで、溶銑の成分組成、製鋼精錬方式、生産鋼種などに応じて適宜に溶銑の予備処理を行う必要がある。 The hot metal discharged from the blast furnace is often subjected to desulfurization treatment and dephosphorization treatment called hot metal pretreatment before decarburization and refining in the converter. When the silicon content of the hot metal is high, the dephosphorization reaction is inhibited. In order to efficiently perform the dephosphorization process, the desiliconization process may be performed prior to the dephosphorization process. This desiliconization process is also one of the hot metal preliminary processes. The hot metal component varies depending on the raw materials and operating conditions of the blast furnace, and the composition is not necessarily suitable for the next steelmaking process. The component composition of the hot metal required in the steelmaking stage varies depending on the target component composition of the final molten steel, the steelmaking process, the production efficiency, and the like. Therefore, it is necessary to appropriately perform hot metal pretreatment depending on the composition of the hot metal, the steelmaking refining method, the production steel type, and the like.
溶銑予備処理は溶銑輸送容器である取鍋で行われる場合もあるし、転炉型精錬炉で行われる場合もある。以下では、取鍋で行われる場合と、転炉型精錬炉で行われる場合とに分けて説明する。 The hot metal pretreatment may be performed in a ladle which is a hot metal transport container or in a converter type refining furnace. Below, it demonstrates by dividing into the case where it is performed in a ladle and the case where it is performed in a converter type refining furnace.
溶銑予備処理が取鍋で行われる場合、取鍋で溶銑予備処理を行い、除滓した後に、取鍋に保温材として、小粒径のＭｇＯ−Ｃ煉瓦を投入する。図２は、ＭｇＯ−Ｃ煉瓦投入設備を示す。小粒径のＭｇＯ−Ｃ煉瓦は、地下ピットに設けられる主ホッパ１に貯蔵される。小粒径のＭｇＯ−Ｃ煉瓦は、主ホッパ１から配管設備２を経由して、取鍋４の上方に設けられるサービスホッパ３に供給される。サービスホッパ３は、溶銑が除滓された取鍋４に小粒径のＭｇＯ−Ｃ煉瓦を投入する。取鍋４の上方には集塵フードが設けられる。ＭｇＯ−Ｃ煉瓦を投入するとき、塵芥が発生する。この塵芥は、集塵装置（図示せず）に回収される。 When the hot metal pretreatment is performed in a ladle, the hot metal pretreatment is performed in the ladle, and after removing the molten iron, a small-sized MgO-C brick is put into the ladle as a heat insulating material. FIG. 2 shows an MgO—C brick charging facility. The small-sized MgO-C brick is stored in the main hopper 1 provided in the underground pit. The small particle size MgO-C brick is supplied from the main hopper 1 via the piping facility 2 to the service hopper 3 provided above the ladle 4. The service hopper 3 puts MgO—C brick having a small particle diameter into the ladle 4 from which the hot metal has been removed. A dust collection hood is provided above the ladle 4. When the MgO-C brick is thrown in, dust is generated. This dust is collected by a dust collector (not shown).
小粒径のＭｇＯ−Ｃ煉瓦の成分組成を表１に示す。
溶銑予備処理が転炉型精錬炉で行われる場合、溶銑は転炉型精錬炉から取鍋に出湯される。溶銑を取鍋に出湯した直後に、保温材として、小粒径のＭｇＯ−Ｃ煉瓦が投入される。転炉型精錬炉から出湯する場合、通常、溶銑は転炉型精錬炉の出湯口から出湯される。そのため、出湯の初期には溶銑のみが出湯され、末期にスラグが混入する。そして、溶銑の出湯が完了した時点で精錬炉は傾転され、スラグの取鍋への流出が停止される。したがって、スラグの取鍋への流出は少なく、出湯後に取鍋に流出したスラグを排滓する必要がない。 When the hot metal pretreatment is performed in a converter type refining furnace, the hot metal is discharged from the converter type refining furnace into a ladle. Immediately after the hot metal is taken out into the ladle, MgO—C brick having a small particle diameter is introduced as a heat insulating material. When the hot water is discharged from the converter type refining furnace, the hot metal is usually discharged from the hot water outlet of the converter type refining furnace. Therefore, only hot metal is poured out at the beginning of the tapping, and slag is mixed in at the end. Then, when the hot metal discharge is completed, the smelting furnace is tilted, and the outflow of the slag into the ladle is stopped. Therefore, there is little outflow of slag into the ladle, and it is not necessary to discharge slag that has flowed out into the ladle after hot water.
なお、保温材として、粉砕された転炉脱炭スラグや取鍋スラグを小粒径のＭｇＯ−Ｃ煉瓦に混合してもよい。転炉脱炭スラグとは、溶銑の転炉脱炭精錬で生成するスラグが冷却固化したものである。取鍋スラグとは、転炉で脱炭精錬された溶鋼を転炉から受けた取鍋内の溶鋼上に存在するスラグが冷却固化したものである。転炉脱炭スラグ及び取鍋スラグは、転炉脱炭精錬において、滓化促進剤として機能するから、排滓する必要がない。 In addition, you may mix the pulverized converter decarburization slag and the ladle slag with MgO-C brick of a small particle size as a heat insulating material. The converter decarburization slag is obtained by cooling and solidifying slag produced by converter decarburization refining of hot metal. The ladle slag is obtained by cooling and solidifying slag present on molten steel in a ladle that has received molten steel decarburized and refined in the converter from the converter. Converter decarburization slag and ladle slag function as hatching accelerators in converter decarburization refining, and therefore do not need to be discharged.
取鍋内に収容された溶銑は、製鋼工場の転炉に輸送される。溶銑の表面は小粒径のＭｇＯ−Ｃ煉瓦で覆われているから、輸送中に溶銑の温度が低下することがない。製鋼工場に搬送された溶銑は、転炉に装入される。保温材も、排滓されることなく、転炉に装入される。保温材は、高価なＭｇ合金の代替として利用される。また、転炉には、大粒径のＭｇＯ−Ｃ煉瓦、生成されるスラグの塩基度（ＣａＯ／ＳｉＯ2）を確保するための生石灰、スラグ組成を調整するためのドロマイト、焼成ドロマイトなどの造滓材、及び鉄鉱石やミルスケールなどの鉄源系原料が投入される。 The hot metal contained in the ladle is transported to the converter in the steelmaking factory. Since the surface of the hot metal is covered with a small particle size MgO-C brick, the temperature of the hot metal does not decrease during transportation. The hot metal transported to the steelmaking factory is charged into the converter. The heat insulating material is also charged into the converter without being discharged. The heat insulating material is used as an alternative to an expensive Mg alloy. The converter also has a large particle size MgO-C brick, quick lime to secure the basicity of the slag to be produced (CaO / SiO 2 ), dolomite to adjust the slag composition, calcined dolomite, etc. Dredged materials and iron source materials such as iron ore and mill scale are introduced.
転炉の上吹きランス、又は転炉底部の底吹き羽口から酸素ガスを供給することで、溶銑が脱炭精錬される。溶鋼が所定の炭素濃度になったら、酸素ガスの供給を停止し、転炉本体を傾け、出鋼口から溶鋼を溶鋼保持容器に出鋼する。スラグは炉口から受滓容器に出湯される。転炉では、この一連の操業が繰り返される。 By supplying oxygen gas from the top blowing lance of the converter or the bottom blowing tuyeres at the bottom of the converter, the hot metal is decarburized and refined. When the molten steel reaches a predetermined carbon concentration, the supply of oxygen gas is stopped, the converter body is tilted, and the molten steel is discharged from the outlet hole into the molten steel holding container. Slag is discharged from the furnace port into a receiving container. In the converter, this series of operations is repeated.
なお、本発明は上記実施形態に限られることなく、本発明の要旨を変更しない範囲で様々に変更できる。例えば、溶銑予備処理は、製鋼工場内に設けられた専用設備によって行われてもよい。この場合、高炉から取鍋又は混銑車に溶銑を出銑し、取鍋又は混銑車が溶銑を製鋼工場に輸送する。保温材としての小粒径のＭｇＯ−Ｃ煉瓦は、溶銑が出銑された直後の取鍋又は混銑車に投入される。 In addition, this invention is not restricted to the said embodiment, In the range which does not change the summary of this invention, it can change variously. For example, the hot metal preliminary treatment may be performed by dedicated equipment provided in a steelmaking factory. In this case, the hot metal is fed from the blast furnace to the ladle or the kneading car, and the ladle or the kneading car transports the hot metal to the steelmaking factory. The small-sized MgO-C brick as a heat insulating material is put into a ladle or a kneading vehicle immediately after the hot metal is discharged.
図３は、溶銑の温度降下と経過時間との関係を示したグラフである。図中の白丸が保温材として従来のペーパースラッジを使用したときのグラフであり、図中の黒丸が目開きが５ｍｍの篩分機で分級した（５ｍｍアンダー）のＭｇＯ−Ｃ煉瓦を使用したときのグラフである。保温材として５ｍｍアンダーのＭｇＯ−Ｃ煉瓦を使用することで、ペーパースラッジを使用する場合に比べ、温度降下量を低減できる。保温効果の優れる５ｍｍアンダーのＭｇＯ−Ｃ煉瓦を使用するならば、ペーパースラッジよりも温度降下量をより低減できることが期待できる。 FIG. 3 is a graph showing the relationship between the temperature drop of the hot metal and the elapsed time. The white circle in the figure is a graph when a conventional paper sludge is used as a heat insulating material, and the black circle in the figure is when using MgO-C bricks classified by a sieving machine having an opening of 5 mm (under 5 mm). It is a graph. By using 5 mm under MgO-C brick as a heat insulating material, the amount of temperature drop can be reduced as compared with the case of using paper sludge. If a 5 mm under MgO-C brick having an excellent heat retaining effect is used, it can be expected that the amount of temperature drop can be reduced more than paper sludge.
１…主ホッパ
２…配管設備
３…サービスホッパ
４…取鍋
1 ... Main hopper 2 ... Piping equipment 3 ... Service hopper 4 ... Ladle
Claims (2)
製鋼工場において、保温材として利用した使用済みＭｇＯ−Ｃ煉瓦を転炉に装入する使用済みＭｇＯ−Ｃ煉瓦の利用方法。 When transporting hot metal from a blast furnace to a steel factory in a hot metal transport container, the crushed used MgO-C brick is put into the hot metal transport container as a heat insulating material to keep the hot metal warm.
A method of using a used MgO-C brick in which a used MgO-C brick used as a heat insulating material is charged into a converter in a steelmaking factory.
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