JP2006257518A - Refining flux and production method therefor - Google Patents
Refining flux and production method therefor Download PDFInfo
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- JP2006257518A JP2006257518A JP2005078477A JP2005078477A JP2006257518A JP 2006257518 A JP2006257518 A JP 2006257518A JP 2005078477 A JP2005078477 A JP 2005078477A JP 2005078477 A JP2005078477 A JP 2005078477A JP 2006257518 A JP2006257518 A JP 2006257518A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
Description
本発明は、溶銑又は溶鋼の精錬、とくに溶銑の脱硫処理、溶鋼の脱硫、介在物の低減を効率よく行うことができる精錬用フラックスに関する。 The present invention relates to a refining flux capable of efficiently performing refining of hot metal or molten steel, in particular, desulfurization of molten iron, desulfurization of molten steel, and reduction of inclusions.
高炉で製造された溶銑中には、Ｓ，Ｐ等の不純物元素が多量に含まれており、次の製鋼工程における精錬効率や鋼の品質に悪影響を及ぼす為、一般に、不純物元素の除去処理が行われる。また転炉などで精錬した溶鋼に関しては、脱硫処理や鋼中酸素の低減を図る為に真空脱ガスを行う、所謂、RH処理等の取鍋精錬が行われる。 The hot metal produced in the blast furnace contains a large amount of impurity elements such as S and P, which adversely affects the refining efficiency and steel quality in the next steelmaking process. Done. In addition, for molten steel refined in a converter or the like, ladle refining such as so-called RH treatment, in which vacuum degassing is performed in order to desulfurize and reduce oxygen in the steel, is performed.
一般に、溶銑の脱硫処理は、脱硫用フラックスとして生石灰（CaO）、ソーダ灰（Na2CO3）、カーバイト（CaC2）、Mg等を単味または相互に組み合せて用い、吹き込みランスから吹き込んだり、投入・攪拌して行われる。一方、溶鋼の処理では、取鍋中のスラグの還元と塩基度を確保するため、Alと生石灰や蛍石（CaF2）の添加を行うと共に、RH処理等による介在物の浮上を促進することが行われる。 In general, hot metal desulfurization is performed by using quick lime (CaO), soda ash (Na 2 CO 3 ), carbide (CaC 2 ), Mg, etc. as a desulfurization flux, or by blowing from a blow lance. , Charged and stirred. On the other hand, in the treatment of molten steel, in order to ensure the reduction and basicity of slag in the ladle, Al, quicklime and fluorite (CaF 2 ) are added and the rise of inclusions by RH treatment is promoted. Is done.
従来技術の精錬、特に溶鋼の清浄化処理および脱硫処理は、取鍋中でスラグの還元と塩基度の確保を迅速かつ均一に行う必要があるが、主として使用される生石灰は溶融しにくい為、溶融促進剤としてCaF2を添加することが行われている。 Prior art refining, especially cleaning and desulfurization of molten steel, requires quick and uniform reduction of slag and basicity in a ladle. CaF 2 is added as a melting accelerator.
しかしながらCaF2を添加、混合して生石灰を迅速かつ均一に溶融させることは極めて難しく、その結果として溶鋼の清浄化または脱硫処理の効果が不十分となり、しかも品質のバラツキが生じ易いという課題がある。さらにCaF2を添加した場合、耐火物の浸蝕が激しく、取鍋やRH処理槽の耐火物寿命が著しく短くなり、溶鋼処理上の大きな課題となっている。 However, it is extremely difficult to quickly and uniformly melt CaF 2 by adding and mixing CaF 2 , and as a result, there is a problem that the effect of cleaning or desulfurization of molten steel becomes insufficient, and quality variations are likely to occur. . Furthermore, when CaF 2 is added, the refractory is eroded severely and the life of the refractory in the ladle and RH treatment tank is remarkably shortened, which is a major problem in molten steel treatment.
その為、CaO−Al２O3からなるフラックス等が検討されているが、耐火物寿命は長くなるものの、CaO−CaF2からなるフラックスと比較すると初期脱硫率が低いという課題がある。 Therefore, a flux composed of CaO—Al 2 O 3 has been studied, but there is a problem that the initial desulfurization rate is low as compared with a flux composed of CaO—CaF 2 although the refractory life is increased.
本発明の目的は、前記課題を解決し、溶銑，溶鋼の脱硫、清浄化処理を効率よくかつ均一に行うことができ、さらに耐火物溶損の少ない溶銑、溶鋼の精錬用フラックスおよびその製造方法を提供することである。 The object of the present invention is to solve the above-mentioned problems, and to efficiently and uniformly carry out hot metal, desulfurization and cleaning of molten steel, and further, a hot metal with less refractory erosion, a flux for refining molten steel, and a method for producing the same Is to provide.
すなわち、本発明は、CaOを27〜37質量％、Al2O3を14〜24質量％、SiO2を29〜39質量％、CaF2を10〜20質量％含むことを特徴とする精錬用フラックスであり、12CaO・7Al2O3、CaO・Al2O3、CaO・2 Al2O3、CaO・SiO2、SiO2及びCaF2を含むことを特徴とする請求項1記載の精錬用フラックスである。 That is, the present invention includes 27 to 37% by mass of CaO, 14 to 24% by mass of Al 2 O 3 , 29 to 39% by mass of SiO 2 , and 10 to 20% by mass of CaF 2 . The refining process according to claim 1, which is a flux and contains 12CaO · 7Al 2 O 3 , CaO · Al 2 O 3 , CaO · 2 Al 2 O 3 , CaO · SiO 2 , SiO 2 and CaF 2 . It is flux.
さらに、本発明は、12CaO・7 Al2O3、CaO・Al2O3及びCaO・2 Al2O3を含むクリンカー、CaO・SiO2及びSiO2を含むクリンカー、並びに、CaF2を混合粉砕、或いは、前記クリンカー及びCaF2を個別に粉砕後混合することを特徴とする精錬用フラックスの製造方法である。 Furthermore, the present invention provides a clinker containing 12CaO · 7 Al 2 O 3 , CaO · Al 2 O 3 and CaO · 2 Al 2 O 3 , a clinker containing CaO · SiO 2 and SiO 2 , and mixed grinding of CaF 2 Alternatively, the clinker and CaF 2 are individually pulverized and mixed, and then the refining flux is produced.
本発明によれば、溶銑，溶鋼の脱硫、清浄化処理を効率よくかつ均一に行うことができ、さらに耐火物溶損の少ない溶銑、溶鋼の精錬用フラックスおよびその製造方法を提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, hot metal, desulfurization of molten steel, and a purification process can be performed efficiently and uniformly, and also a hot metal with little refractory erosion loss, the flux for refining molten steel, and its manufacturing method can be provided. .
本発明に係る精錬用フラックスの原料は特に限定されないが、CaO源として生石灰あるいは石灰石、Al2O3源として仮焼ボーキサイトあるいは仮焼アルミナ、SiO2源として珪石あるいはシリカ、CaF2源としてホタル石を原料として用いるのが一般的である。いずれも、不純物の少ないものを使用することが好ましい。これらの原料を、CaOが27〜37質量％、Al2O3が14〜24質量％、SiO2が29〜39質量％、CaF2が10〜20質量％となるように配合する。 The raw material of the refining flux according to the present invention is not particularly limited, but quick lime or limestone as the CaO source, calcined bauxite or calcined alumina as the Al 2 O 3 source, silica or silica as the SiO 2 source, fluorite as the CaF 2 source Is generally used as a raw material. In any case, it is preferable to use one having few impurities. These raw materials are blended so that CaO is 27 to 37% by mass, Al 2 O 3 is 14 to 24% by mass, SiO 2 is 29 to 39% by mass, and CaF 2 is 10 to 20% by mass.
本発明に係るCaF2は、フラックスの融点を低下させる為に配合するが、CaF2量は10〜20質量％が好ましい。CaF2が20質量％を超えると、耐火物の溶損が激しくなる場合がある。一方、CaF2が10質量％未満であると、脱硫性能が低下する。また、CaO表面がCaF2で被覆されると、フラックスの初期脱硫率が向上する。 CaF 2 according to the present invention is formulated in order to lower the melting point of the flux, CaF 2 content is preferably 10 to 20 wt%. If CaF 2 exceeds 20% by mass, the refractory may be severely melted. On the other hand, if the CaF 2 content is less than 10% by mass, the desulfurization performance decreases. Further, when the CaO surface is coated with CaF 2, thereby improving the initial desulfurization rate of the flux.
本発明に係るCaOは、溶銑、溶鋼の脱硫の為に配合するが、CaO量は27〜37質量％が好ましい。CaOが37質量％を超えるとフラックスの融点が高くなり、溶鋼中で溶けなくなる場合がある。一方、CaOが27質量％未満であると、脱硫性能が低下する。また、CaO表面がCaF2で被覆されると、CaOの耐吸湿性が向上する。 CaO according to the present invention is blended for desulfurization of hot metal and molten steel, but the amount of CaO is preferably 27 to 37% by mass. When CaO exceeds 37 mass%, the melting point of the flux becomes high and may not be melted in the molten steel. On the other hand, if the CaO content is less than 27% by mass, the desulfurization performance decreases. Further, when the CaO surface is coated with CaF 2, thereby improving the moisture absorption resistance of CaO.
本発明に係るAl2O3は、フラックスの融点を低下させる為、並びに、フラックスの粘度を高くする為に配合するが、Al2O3量は14〜24質量％が好ましい。Al2O3が24質量％を超えると粘度が高くなり過ぎたり、脱硫率が低下したりする場合がある。一方、Al2O3が14質量％未満であると、フラックスの融点が低下しない為、脱硫性能が低下する場合がある。 Al 2 O 3 according to the present invention is blended in order to lower the melting point of the flux and increase the viscosity of the flux, but the amount of Al 2 O 3 is preferably 14 to 24% by mass. If Al 2 O 3 exceeds 24% by mass, the viscosity may become too high or the desulfurization rate may decrease. On the other hand, if Al 2 O 3 is less than 14% by mass, the melting point of the flux does not decrease, and the desulfurization performance may decrease.
本発明に係るSiO2は、フラックスの融点を低下させる為、並びに、フラックスの粘度を高くする為に配合するが、SiO2量は29〜39質量％が好ましい。SiO2が39質量％を超えると粘度が高くなり過ぎたり、脱硫率が低下したりする場合がある。一方、SiO2が29質量％未満であると、フラックスの融点が低下しない為、脱硫性能が低下する場合がある。 SiO 2 according to the present invention, in order to lower the melting point of the flux, as well, but blended in order to increase the viscosity of the flux, SiO 2 content is preferably 29 to 39 wt%. When SiO 2 exceeds 39% by mass, the viscosity may become too high, or the desulfurization rate may decrease. On the other hand, if the SiO 2 content is less than 29% by mass, the melting point of the flux does not decrease, and the desulfurization performance may decrease.
12CaO・7Al2O3、CaO・Al2O3及びCaO・2Al2O3を含むクリンカーは、電気炉、アーク炉、反射炉等の設備にCaO源とAl2O3源を所定量投入し、溶融することで得られる。また、焼成法で12CaO・7Al2O3、CaO・Al2O3及びCaO・2Al2O3を含むクリンカーを作製するには、シャフトキルン、またはロータリーキルン等の設備にCaO源とAl2O3源を所定量投入し、焼成する。 The clinker containing 12CaO · 7Al 2 O 3 , CaO · Al 2 O 3 and CaO · 2Al 2 O 3 is charged with a predetermined amount of CaO source and Al 2 O 3 source into facilities such as electric furnace, arc furnace, reflection furnace, etc. It is obtained by melting. In addition, in order to produce a clinker containing 12CaO · 7Al 2 O 3 , CaO · Al 2 O 3 and CaO · 2Al 2 O 3 by a firing method, a CaO source and Al 2 O 3 are installed in equipment such as a shaft kiln or a rotary kiln. A predetermined amount of the source is charged and fired.
CaO・SiO2及びSiO2を含むクリンカーは、電気炉、アーク炉、反射炉等の設備にCaO源とSiO2源を所定量投入し、溶融することで得られる。また、焼成法でCaO・SiO2及びSiO2を含むクリンカーを作製するには、シャフトキルン、またはロータリーキルン等の設備にCaO源とSiO2源を所定量投入し、焼成する。 A clinker containing CaO · SiO 2 and SiO 2 can be obtained by charging a predetermined amount of CaO source and SiO 2 source into an electric furnace, an arc furnace, a reflection furnace or the like and melting them. Further, in order to produce a clinker containing CaO.SiO 2 and SiO 2 by a firing method, a predetermined amount of CaO source and SiO 2 source are charged into a facility such as a shaft kiln or a rotary kiln and fired.
本発明の精錬用フラックスは、溶銑又は溶鋼の精錬、とくに溶銑の脱硫処理、溶鋼の脱硫、介在物の低減用フラックスとして好適である。 The refining flux of the present invention is suitable as a flux for refining hot metal or molten steel, particularly for desulfurization of molten iron, desulfurization of molten steel, and inclusion reduction.
CaO源、Al2O3源を用い、ロータリーキルンで1400℃×2時間焼成して、12CaO・7Al2O3、CaO・Al2O3及びCaO・2Al2O3を含むクリンカーを得た。また、CaO源、SiO2源を用い、ロータリーキルンにて1300℃×2時間焼成して、CaO・SiO2及びSiO2を含むクリンカーを得た。得られたクリンカーの化学成分及び鉱物組成を表１に示す。 CaO source, using the Al 2 O 3 source, and calcined 1400 ° C. × 2 hours at a rotary kiln to obtain a clinker comprising 12CaO · 7Al 2 O 3, CaO · Al 2 O 3 and CaO · 2Al 2 O 3. Further, using a CaO source and a SiO 2 source, firing was performed at 1300 ° C. for 2 hours in a rotary kiln to obtain a clinker containing CaO.SiO 2 and SiO 2 . The chemical components and mineral composition of the obtained clinker are shown in Table 1.
12CaO・7Al2O3、CaO・Al2O3及びCaO・2Al2O3を含むクリンカー、並びに、CaO・SiO2及びSiO2を含むクリンカーにCaF2源を添加し、ハンマーミルで粉砕して5mm以下になるように整粒し、フラックスを作製した。初期脱硫率（添加剤投入後５分後）と最終脱硫率（添加剤投入後３０分後）を以下の方法に従って測定した。 Add CaF 2 source to clinker containing 12CaO · 7Al 2 O 3 , CaO · Al 2 O 3 and CaO · 2Al 2 O 3, and clinker containing CaO · SiO 2 and SiO 2 , and grind with hammer mill The particle size was adjusted to 5 mm or less to produce a flux. The initial desulfurization rate (5 minutes after adding the additive) and the final desulfurization rate (30 minutes after adding the additive) were measured according to the following methods.
〈測定方法〉
アルゴンガス雰囲気下、竪型管状炉内の中央に設置されたマグネシア製ルツボに溶鋼（SS400、温度1550℃）を入れ、溶鋼100質量部あたりフラックス5質量部を竪型管状炉の上部より投入し30分間放置した。フラックスを投入してから5分後（初期脱硫率）と30分後（最終脱硫率）に溶鋼のサンプリングを行い、高周波燃焼／赤外吸収法によって硫黄濃度を測定し、脱硫率（％）＝（溶鋼から除去された硫黄質量）×100／（処理前の溶鋼中の硫黄質量）、により脱硫率を算出した。結果を表１に併記する。
<Measuring method>
In an argon gas atmosphere, put molten steel (SS400, temperature 1550 ° C) in a magnesia crucible installed in the center of the vertical tubular furnace, and charge 5 parts by mass of flux per 100 parts by mass of molten steel from the top of the vertical tubular furnace. Left for 30 minutes. Sampling of molten steel was performed 5 minutes after the flux was introduced (initial desulfurization rate) and 30 minutes (final desulfurization rate), and the sulfur concentration was measured by the high frequency combustion / infrared absorption method. Desulfurization rate (%) = The desulfurization rate was calculated by (sulfur mass removed from molten steel) × 100 / (sulfur mass in molten steel before treatment). The results are also shown in Table 1.
〈使用材料〉
CaO源：生石灰、市販品
CaF2源：蛍石（CaF295%以上）
Al2O3源：焼結アルミナ粉、市販品
SiO2源：珪石、市販品
<Materials used>
CaO source: quick lime, commercial product
CaF 2 source: fluorite (CaF 2 95% or more)
Al 2 O 3 source: Sintered alumina powder, commercial product
SiO 2 source: Silica, commercial product
実施例1で作製したフラックスを用いて、溶損率を測定した。結果を表２に示す。 Using the flux produced in Example 1, the melting loss rate was measured. The results are shown in Table 2.
〈測定方法〉
高周波炉内の中央に設置されたマグネシア製ルツボ中にフラックスを入れ（温度約1600℃）、マグネシア―クロム煉瓦（φ30×300mmの加工品の下から100mm部分）を浸漬し30分間放置した。マグネシア―クロム煉瓦を取り出して冷却後、直径を測定し、溶損率（％）＝（浸漬中に損耗したマグネシア―クロム煉瓦の直径）×100／（処理前のマグネシア―クロム煉瓦の直径）、により溶損率を算出した。
<Measuring method>
Flux was put in a magnesia crucible installed in the center of the induction furnace (temperature about 1600 ° C), and magnesia-chromium brick (100mm from the bottom of the processed product of φ30 × 300mm) was immersed and left for 30 minutes. After taking out magnesia-chrome brick and cooling, measure the diameter, melting rate (%) = (diameter of magnesia-chromium brick worn during immersion) × 100 / (diameter of magnesia-chrome brick before treatment), Was used to calculate the melting rate.
Claims (3)
12CaO · 7 Al 2 O 3 , clinker containing CaO · Al 2 O 3 and CaO · 2 Al 2 O 3 , clinker containing CaO · SiO 2 and SiO 2 , and mixed grinding of CaF 2 , or the clinker and A method for producing a flux for refining, characterized in that CaF 2 is individually ground and mixed.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008063600A (en) * | 2006-09-05 | 2008-03-21 | Nippon Steel Corp | Method for desulfurizing molten iron containing chromium |
| JP2008274331A (en) * | 2007-04-26 | 2008-11-13 | Denki Kagaku Kogyo Kk | Desulfurizing agent |
| KR101006398B1 (en) | 2008-07-30 | 2011-01-10 | 주식회사 포인 | Complex refining agent and manufacturing method thereof |
| KR101118575B1 (en) | 2010-03-17 | 2012-02-27 | 한양대학교 산학협력단 | Slag composition for smelting reduction of spent petroleum catalysts |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108977609A (en) * | 2018-08-06 | 2018-12-11 | 邵珠航 | A kind of metal smelt desulfurizing agent and preparation method thereof |
-
2005
- 2005-03-18 JP JP2005078477A patent/JP4163186B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008063600A (en) * | 2006-09-05 | 2008-03-21 | Nippon Steel Corp | Method for desulfurizing molten iron containing chromium |
| JP2008274331A (en) * | 2007-04-26 | 2008-11-13 | Denki Kagaku Kogyo Kk | Desulfurizing agent |
| KR101006398B1 (en) | 2008-07-30 | 2011-01-10 | 주식회사 포인 | Complex refining agent and manufacturing method thereof |
| KR101118575B1 (en) | 2010-03-17 | 2012-02-27 | 한양대학교 산학협력단 | Slag composition for smelting reduction of spent petroleum catalysts |
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|---|---|
| JP4163186B2 (en) | 2008-10-08 |
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