JP2022083583A - Steel desulfurization agent and method for manufacturing the same - Google Patents
Steel desulfurization agent and method for manufacturing the same Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 99
- 239000010959 steel Substances 0.000 title claims abstract description 99
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 29
- 238000006477 desulfuration reaction Methods 0.000 title abstract description 74
- 230000023556 desulfurization Effects 0.000 title abstract description 74
- 238000000034 method Methods 0.000 title abstract 5
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 103
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 50
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000000292 calcium oxide Substances 0.000 claims abstract description 46
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 43
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 43
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 43
- 229910052751 metal Inorganic materials 0.000 claims abstract description 34
- 239000002184 metal Substances 0.000 claims abstract description 34
- 239000000460 chlorine Substances 0.000 claims abstract description 19
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052801 chlorine Inorganic materials 0.000 claims abstract description 18
- 239000000203 mixture Substances 0.000 claims abstract description 16
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000011575 calcium Substances 0.000 claims abstract description 12
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 12
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000011777 magnesium Substances 0.000 claims abstract description 11
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 11
- 238000000465 moulding Methods 0.000 claims abstract description 8
- 230000003009 desulfurizing effect Effects 0.000 claims description 73
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 32
- 239000001110 calcium chloride Substances 0.000 claims description 32
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 32
- 229910052717 sulfur Inorganic materials 0.000 claims description 22
- 239000011593 sulfur Substances 0.000 claims description 22
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 21
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical group [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 16
- 238000010304 firing Methods 0.000 claims description 15
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 12
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 12
- 239000000347 magnesium hydroxide Substances 0.000 claims description 11
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 11
- 239000010459 dolomite Substances 0.000 claims description 9
- 229910000514 dolomite Inorganic materials 0.000 claims description 9
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 8
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical group [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 6
- 239000001095 magnesium carbonate Substances 0.000 claims description 6
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 6
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 6
- 238000003723 Smelting Methods 0.000 claims description 4
- 239000010419 fine particle Substances 0.000 claims description 4
- 238000002844 melting Methods 0.000 abstract description 11
- 230000008018 melting Effects 0.000 abstract description 11
- 239000008187 granular material Substances 0.000 abstract description 9
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 abstract description 8
- 239000000920 calcium hydroxide Substances 0.000 abstract description 6
- 229910001861 calcium hydroxide Inorganic materials 0.000 abstract description 6
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 abstract description 4
- 239000010436 fluorite Substances 0.000 abstract description 3
- 238000005660 chlorination reaction Methods 0.000 abstract 3
- 239000000463 material Substances 0.000 abstract 1
- 238000005245 sintering Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 16
- 239000002893 slag Substances 0.000 description 15
- 238000007796 conventional method Methods 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 10
- 239000002245 particle Substances 0.000 description 10
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 4
- 239000011737 fluorine Substances 0.000 description 4
- 229910052731 fluorine Inorganic materials 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 238000001354 calcination Methods 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 239000004480 active ingredient Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- JGIATAMCQXIDNZ-UHFFFAOYSA-N calcium sulfide Chemical compound [Ca]=S JGIATAMCQXIDNZ-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 229910052707 ruthenium Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910004261 CaF 2 Inorganic materials 0.000 description 1
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- CTUDRLGCNRAIEA-UHFFFAOYSA-L calcium;chloride;hydroxide Chemical compound [OH-].[Cl-].[Ca+2] CTUDRLGCNRAIEA-UHFFFAOYSA-L 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- QENHCSSJTJWZAL-UHFFFAOYSA-N magnesium sulfide Chemical compound [Mg+2].[S-2] QENHCSSJTJWZAL-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Treatment Of Steel In Its Molten State (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
この発明は、製鉄所の高炉又は電炉から取り出される溶湯（溶銑）中に含まれる硫黄成分等の不純物を溶湯中から取り除いて鉄鋼の品質を向上させるための鉄鋼用脱硫剤及びその製造方法に関する。 The present invention relates to a desulfurizing agent for steel and a method for producing the same, for removing impurities such as sulfur components contained in a molten metal (hot metal) taken out from a blast furnace or an electric furnace of a steel mill from the molten metal to improve the quality of steel.
一般に鉄鋼用脱硫剤として石灰（ＣａＯ）を主成分とするものが多く用いられている。この場合、石灰が硫黄（Ｓ）と反応する脱硫反応が起き、硫黄は硫化カルシウムとなって取り除かれる。この脱硫反応は、塩基度が高いほど進行しやすいことから、蛍石（ＣａＦ２）等の成分が配合される。 Generally, as a desulfurizing agent for steel, a desulfurizing agent containing lime (CaO) as a main component is often used. In this case, a desulfurization reaction occurs in which lime reacts with sulfur (S), and sulfur becomes calcium sulfide and is removed. Since this desulfurization reaction is more likely to proceed as the basicity is higher, a component such as fluorite (CaF 2 ) is blended.
この種の鉄鋼用脱硫剤が例えば特許文献１に開示されている。この従来構成の鉄鋼用脱硫剤は、ＣａＯ／ＭｇＯが１．０～２．１の比率でＣａＯ及びＭｇＯを含むドロマイトを主成分とするものである。この脱硫剤では、ドロマイト中にＣａＯが極めて微細に存在しているため、蛍石等を配合しなくても良好な脱硫性能を発揮することができる。 This type of desulfurizing agent for steel is disclosed in, for example, Patent Document 1. This conventional desulfurization agent for steel contains dolomite containing CaO and MgO in a ratio of CaO / MgO of 1.0 to 2.1 as a main component. In this desulfurization agent, CaO is present in extremely fine amounts in the dolomite, so that good desulfurization performance can be exhibited without adding fluorite or the like.
前記特許文献１に記載されている従来構成の脱硫剤においては、ドロマイトを主成分とし、そのドロマイトのＣａＯ／ＭｇＯの比率が１．０～２．１であるとともに、その他の成分として石灰等のＣａＯ源やアルミニウム等の脱酸成分が配合されるに過ぎない。このため、溶湯に対する脱硫剤の溶融速度が遅く、溶湯の粘度低下に時間を要し、流動性の向上を図ることが難しい。従って、脱硫反応の進行が遅くなり、その結果同一時間内では脱硫率の低下を招くという欠点があった。 The desulfurizing agent having the conventional structure described in Patent Document 1 contains dolomite as a main component, and the CaO / MgO ratio of the dolomite is 1.0 to 2.1, and other components include lime and the like. It only contains a CaO source and a deoxidizing component such as aluminum. Therefore, the melting rate of the desulfurizing agent with respect to the molten metal is slow, it takes time to reduce the viscosity of the molten metal, and it is difficult to improve the fluidity. Therefore, there is a drawback that the progress of the desulfurization reaction is slowed down, and as a result, the desulfurization rate is lowered within the same time.
そこで、この発明の目的とするところは、溶湯に対する溶融速度を速くできて、脱硫率の向上を図ることができる鉄鋼用脱硫剤及びその製造方法を提供することにある。 Therefore, an object of the present invention is to provide a desulfurizing agent for steel and a method for producing the same, which can increase the melting rate for molten metal and improve the desulfurization rate.
上記の目的を達成するために、この発明の鉄鋼用脱硫剤は、鉄鋼製錬炉内の溶湯に含まれる硫黄分と反応し、その硫黄分の除去を促進する脱硫剤であって、酸化カルシウム（ＣａＯ）、酸化マグネシウム（ＭｇＯ）及び塩化水酸化カルシウム〔ＣａＣｌ（ＯＨ）〕を含有することを特徴とする。 In order to achieve the above object, the desulfurizing agent for steel of the present invention is a desulfurizing agent that reacts with the sulfur content contained in the molten metal in the steel smelting furnace and promotes the removal of the sulfur content, and is calcium oxide. It is characterized by containing (CaO), magnesium oxide (MgO) and calcium chloride [CaCl (OH)].
前記酸化カルシウム１００質量部に対して酸化マグネシウムの含有量が４０～８０質量部であり、塩化水酸化カルシウムの含有量が２～２０質量部であることが好ましい。
塩化水酸化マグネシウム〔ＭｇＣｌ（ＯＨ）〕を含有することがより好ましい。
It is preferable that the content of magnesium oxide is 40 to 80 parts by mass and the content of calcium chloride is 2 to 20 parts by mass with respect to 100 parts by mass of the calcium oxide.
It is more preferable to contain magnesium chloride [MgCl (OH)].
前記鉄鋼用脱硫剤の第１の製造方法は、酸化カルシウム、酸化マグネシウム及び塩化水酸化カルシウムを含有する混合物を加圧成形して造粒物を調製することを特徴とする。
前記鉄鋼用脱硫剤の第２の製造方法は、カルシウム源、マグネシウム源及び塩素源を含有する混合物を造粒して造粒物を成形し、その造粒物を焼成することを特徴とする。
The first method for producing a desulfurizing agent for steel is characterized in that a mixture containing calcium oxide, magnesium oxide and calcium chloride is pressure-molded to prepare a granulated product.
The second method for producing a desulfurizing agent for steel is characterized in that a mixture containing a calcium source, a magnesium source and a chlorine source is granulated to form a granulated product, and the granulated product is calcined.
前記カルシウム源は炭酸カルシウムであり、前記マグネシウム源は炭酸マグネシウム、水酸化マグネシウム又はドロマイトであり、前記塩素源は塩化カルシウムであることが好ましい。 It is preferable that the calcium source is calcium carbonate, the magnesium source is magnesium carbonate, magnesium hydroxide or dolomite, and the chlorine source is calcium chloride.
前記造粒物を焼成した後、破砕又は粉砕して細粒物とすることが好ましい。 It is preferable that the granulated product is fired and then crushed or crushed to obtain fine granules.
この発明の鉄鋼用脱硫剤によれば、溶湯に対する溶融速度を速くできて、脱硫率の向上を図ることができるという効果を奏する。 According to the desulfurization agent for steel of the present invention, there is an effect that the melting rate with respect to the molten metal can be increased and the desulfurization rate can be improved.
以下に、この発明を具体化した実施形態について詳細に説明する。
本実施形態における鉄鋼用脱硫剤は、鉄鋼製錬炉内の溶湯に含まれる硫黄（Ｓ）分と反応し、その硫黄分の除去を促進するものである。この鉄鋼用脱硫剤は、酸化カルシウム（ＣａＯ）、酸化マグネシウム（ＭｇＯ）及び塩化水酸化カルシウム〔ＣａＣｌ（ＯＨ）〕を必須成分として含有する。酸化カルシウムと酸化マグネシウムに塩素化合物である塩化水酸化カルシウムを配合することにより、溶湯に対する脱硫剤の溶融性を高めることができるとともに、スラグ（鉱滓）の流動性（粘性）を向上させ、脱硫反応の効率を高めることができる。
Hereinafter, embodiments embodying the present invention will be described in detail.
The desulfurizing agent for steel in the present embodiment reacts with the sulfur (S) component contained in the molten metal in the steel smelting furnace to promote the removal of the sulfur component. This desulfurizing agent for steel contains calcium oxide (CaO), magnesium oxide (MgO) and calcium chloride [CaCl (OH)] as essential components. By blending calcium chloride and calcium chloride, which is a chlorine compound, with calcium oxide and magnesium oxide, the meltability of the desulfurization agent to the molten metal can be increased, and the fluidity (viscosity) of the slag (mineral slag) can be improved, resulting in a desulfurization reaction. Efficiency can be increased.
前記酸化カルシウム及び酸化マグネシウムは、溶湯中の硫黄と直接反応（脱硫反応）し、溶湯から不純物の硫黄を除去することができる。このとき、酸化カルシウム及び酸化マグネシウムは、溶湯中の燐（Ｐ）分とも同様に反応することから、燐も除去することができる。塩化水酸化カルシウムは、溶湯に対する酸化カルシウムや酸化マグネシウムの溶融性を高めるとともに、スラグを低粘度化して流動性を改善し、脱硫性能を向上させる。 The calcium oxide and magnesium oxide can directly react with sulfur in the molten metal (desulfurization reaction) to remove the sulfur impurities from the molten metal. At this time, since calcium oxide and magnesium oxide react with the phosphorus (P) component in the molten metal in the same manner, phosphorus can also be removed. Calcium chloride hydroxide enhances the meltability of calcium oxide and magnesium oxide in molten metal, lowers the viscosity of slag, improves fluidity, and improves desulfurization performance.
前記鉄鋼用脱硫剤には塩化水酸化マグネシウム〔ＭｇＣｌ（ＯＨ）〕が含まれていることがより好ましい。この塩化水酸化マグネシウムは、溶湯中への酸化カルシウムや酸化マグネシウムの溶融性を高め、スラグの低粘度化により流動性を改善し、脱硫性能を向上させる。このため、塩化水酸化マグネシウムは塩化水酸化カルシウムと相乗的に作用し、脱硫率を向上させることができる。 It is more preferable that the desulfurizing agent for steel contains magnesium chloride [MgCl (OH)]. This magnesium hydroxide enhances the meltability of calcium oxide and magnesium oxide in the molten metal, improves the fluidity by lowering the viscosity of the slag, and improves the desulfurization performance. Therefore, magnesium hydroxide can act synergistically with calcium hydroxide to improve the desulfurization rate.
前記鉄鋼用脱硫剤中の各成分の配合量は、酸化カルシウム１００質量部に対して酸化マグネシウムの含有量が４０～８０質量部であり、塩化水酸化カルシウムの含有量が２～２０質量部であることが好ましい。また、塩化水酸化マグネシウムは、酸化カルシウム１００質量部に対して１～５質量部であることが好ましい。 The blending amount of each component in the desulfurizing agent for steel is 40 to 80 parts by mass of magnesium oxide and 2 to 20 parts by mass of calcium hydroxide with respect to 100 parts by mass of calcium oxide. It is preferable to have. The magnesium hydroxide hydroxide is preferably 1 to 5 parts by mass with respect to 100 parts by mass of calcium oxide.
前記酸化マグネシウムの含有量が４０質量部を下回る場合には、スラグの粘度が高く、流動性の改善が難しくなるとともに、溶湯中での脱硫剤の溶融速度を高めることも難しくなる。その一方、酸化マグネシウムの含有量が８０質量部を上回る場合には、スラグが低粘度化し過ぎたり、他の成分の含有量が相対的に減少したりして好ましくない。 When the content of magnesium oxide is less than 40 parts by mass, the viscosity of the slag is high, it is difficult to improve the fluidity, and it is also difficult to increase the melting rate of the desulfurizing agent in the molten metal. On the other hand, when the content of magnesium oxide exceeds 80 parts by mass, the viscosity of the slag becomes too low and the content of other components is relatively reduced, which is not preferable.
前記塩化水酸化カルシウムの含有量が２質量部より少ない場合、酸化カルシウムや酸化マグネシウムとの相乗的な機能を十分に発現することが難しくなって好ましくない。その一方、塩化水酸化カルシウムの含有量が２０質量部より多い場合、酸化カルシウムや酸化マグネシウムの含有量が相対的に減少して脱硫剤の本来の機能を発揮することが困難になる。 When the content of the calcium hydroxide hydroxide is less than 2 parts by mass, it is difficult to sufficiently exhibit the synergistic function with calcium oxide and magnesium oxide, which is not preferable. On the other hand, when the content of calcium hydroxide hydroxide is more than 20 parts by mass, the content of calcium oxide and magnesium oxide is relatively reduced, and it becomes difficult to exert the original function of the desulfurizing agent.
前記塩化水酸化マグネシウムの含有量が１質量部未満の場合、塩化水酸化マグネシウムの機能発現が不足するとともに、塩化水酸化カルシウムとの相乗作用も得られず好ましくない。一方、塩化水酸化マグネシウムの含有量が５質量部を超える場合、他の必須成分とのバランスが悪くなるとともに、他成分の含有量が相対的に減少して好ましくない。 When the content of magnesium hydroxide is less than 1 part by mass, the functional expression of magnesium hydroxide is insufficient and synergistic action with calcium chloride cannot be obtained, which is not preferable. On the other hand, when the content of magnesium hydroxide exceeds 5 parts by mass, the balance with other essential components becomes poor and the content of other components is relatively reduced, which is not preferable.
前記鉄鋼用脱硫剤にはカーボン（Ｃ）を含有することが好ましい。このカーボンを含有することにより、溶湯に対する脱硫剤の溶融速度を高めることができる。このカーボンの含有量は常法に従って設定されるが、例えば酸化カルシウム１００質量部に対して５～１５質量部であることが好ましい。 The desulfurizing agent for steel preferably contains carbon (C). By containing this carbon, the melting rate of the desulfurizing agent for the molten metal can be increased. The carbon content is set according to a conventional method, and is preferably 5 to 15 parts by mass with respect to 100 parts by mass of calcium oxide, for example.
また、鉄鋼用脱硫剤にはカルシウムアルミネート（ＣａＯ・Ａｌ２Ｏ３）を含有することが好ましい。このカルシウムアルミネートは融点が低いことから、溶湯に対する脱硫剤の溶融速度を向上させることができる。カルシウムアルミネートの含有量も常法に従って設定されるが、例えば酸化カルシウム１００質量部に対して４０～６０質量部であることが好ましい。 Further, it is preferable that the desulfurizing agent for steel contains calcium aluminate (CaO · Al 2 O 3 ). Since this calcium aluminate has a low melting point, the melting rate of the desulfurizing agent for the molten metal can be improved. The content of calcium aluminate is also set according to a conventional method, but is preferably 40 to 60 parts by mass with respect to 100 parts by mass of calcium oxide, for example.
次に、前述した鉄鋼用脱硫剤の製造方法について説明する。
この鉄鋼用脱硫剤の製造方法としては、２つの製造方法が挙げられる。
鉄鋼用脱硫剤の第１の製造方法は、酸化カルシウム、酸化マグネシウム及び塩化水酸化カルシウムを含有する混合物を加圧成形して造粒物を調製するものである。この製造方法では、必須成分を含有する混合物を加圧成形するだけで鉄鋼用脱硫剤を簡易に製造することができる。
Next, the method for producing the above-mentioned desulfurizing agent for steel will be described.
As a method for producing this desulfurizing agent for steel, there are two production methods.
The first method for producing a desulfurizing agent for steel is to prepare a granulated product by pressure-molding a mixture containing calcium oxide, magnesium oxide and calcium chloride. In this production method, a desulfurizing agent for steel can be easily produced only by pressure-molding a mixture containing essential components.
この場合、混合物中の各成分の配合量は、前記鉄鋼用脱硫剤における各成分の含有量が適用される。加圧成形は常法に従って行われ、得られる造粒物の平均粒子径は例えば５～４０ｍｍである。 In this case, the content of each component in the desulfurizing agent for steel is applied to the blending amount of each component in the mixture. The pressure molding is performed according to a conventional method, and the average particle size of the obtained granulated product is, for example, 5 to 40 mm.
鉄鋼用脱硫剤の第２の製造方法は、カルシウム源、マグネシウム源及び塩素源を含有する混合物を造粒して造粒物を成形し、その造粒物を焼成するものである。前記カルシウム源としては炭酸カルシウムであり、マグネシウム源としては炭酸マグネシウム、水酸化マグネシウム又はドロマイトであり、塩素源としては塩化カルシウムが好ましい。焼成温度は９００～１２００℃の範囲が好ましく、９００～１１００℃の範囲がより好ましい。 The second method for producing a desulfurizing agent for steel is to granulate a mixture containing a calcium source, a magnesium source and a chlorine source to form a granulated product, and then calcin the granulated product. The calcium source is calcium carbonate, the magnesium source is magnesium carbonate, magnesium hydroxide or dolomite, and the chlorine source is preferably calcium chloride. The firing temperature is preferably in the range of 900 to 1200 ° C, more preferably in the range of 900 to 1100 ° C.
焼成温度が９００℃未満ではカルシウム源から酸化カルシウムを生成することが難しく、１２００℃を超えると塩素揮発量が増大して塩化水酸化カルシウムの生成量が低下して好ましくない。この製造方法では、焼成後に必須成分として酸化カルシウム、酸化マグネシウム及び塩化水酸化カルシウムが生成するほか、所望成分として塩化水酸化マグネシウム等が生成する。 If the firing temperature is less than 900 ° C, it is difficult to generate calcium oxide from the calcium source, and if it exceeds 1200 ° C, the amount of chlorine volatilized increases and the amount of calcium chloride produced decreases, which is not preferable. In this production method, calcium oxide, magnesium oxide and calcium chloride are produced as essential components after firing, and magnesium chloride and the like are produced as desired components.
前記造粒物を焼成した後には、破砕又は粉砕して細粒物を形成することが好ましい。このようにして得られる鉄鋼用脱硫剤の細粒物は、溶湯に対する鉄鋼用脱硫剤の溶融を促し、溶湯の流動性を改善し、脱硫率を高めることができる。該細粒物の平均粒子径は１ｍｍ未満であることが望ましい。 After firing the granulated product, it is preferable to crush or pulverize the granulated product to form fine granules. The fine granules of the desulfurization agent for steel obtained in this manner can promote the melting of the desulfurization agent for steel with respect to the molten metal, improve the fluidity of the molten metal, and increase the desulfurization rate. The average particle size of the fine particles is preferably less than 1 mm.
次に、前記のように構成された鉄鋼用脱硫剤について作用を説明する。
さて、鉄鋼製錬炉内の溶湯に含まれる硫黄分を取り除く場合には、溶湯に対して所定量の鉄鋼用脱硫剤を添加して撹拌する。このとき、鉄鋼用脱硫剤中には必須成分として酸化カルシウム、酸化マグネシウム及び塩化水酸化カルシウムが含まれている。
Next, the action of the desulfurizing agent for steel configured as described above will be described.
When removing the sulfur content in the molten metal in the steel smelting furnace, a predetermined amount of desulfurizing agent for steel is added to the molten metal and stirred. At this time, the desulfurizing agent for steel contains calcium oxide, magnesium oxide and calcium chloride as essential components.
このため、酸化カルシウム及び酸化マグネシウムが溶湯中の硫黄と反応する脱硫反応が起き、硫黄は硫化カルシウムや硫化マグネシウムとなって取り除かれる。このとき、鉄鋼用脱硫剤には塩化水酸化カルシウムが含まれていることから、溶湯に対する酸化カルシウムや酸化マグネシウムの溶融性が高められ、酸化カルシウム及び酸化マグネシウムの機能が迅速かつ有効に発現される。加えて、塩化水酸化カルシウムはスラグを低粘度化してその流動性を改善することができる。その結果、鉄鋼用脱硫剤の脱硫性能は一段と向上する。 Therefore, a desulfurization reaction occurs in which calcium oxide and magnesium oxide react with sulfur in the molten metal, and sulfur is removed as calcium sulfide and magnesium sulfide. At this time, since the desulfurizing agent for steel contains calcium chloride, the meltability of calcium oxide and magnesium oxide in the molten metal is enhanced, and the functions of calcium oxide and magnesium oxide are rapidly and effectively exhibited. .. In addition, calcium chloride can reduce the viscosity of slag and improve its fluidity. As a result, the desulfurization performance of the desulfurization agent for steel is further improved.
従って、この実施形態によれば、以下のような効果を得ることができる。
（１）この実施形態の鉄鋼用脱硫剤は、酸化カルシウム、酸化マグネシウム及び塩化水酸化カルシウムを必須成分（有効成分）として含有する。このため、酸化カルシウム及び酸化マグネシウムが溶湯中の硫黄等と反応する脱硫反応が進行するとともに、塩化水酸化カルシウムによりその脱硫反応の進行が促進される。
Therefore, according to this embodiment, the following effects can be obtained.
(1) The desulfurizing agent for steel of this embodiment contains calcium oxide, magnesium oxide and calcium chloride as essential components (active ingredients). Therefore, the desulfurization reaction in which calcium oxide and magnesium oxide react with sulfur and the like in the molten metal proceeds, and the progress of the desulfurization reaction is promoted by calcium chloride.
従って、実施形態の鉄鋼用脱硫剤によれば、溶湯に対する溶融速度を早くできて、脱硫率の向上を図ることができる。加えて、この鉄鋼用脱硫剤はフッ素を含有しないことにより、脱硫又は脱リン後のスラグからフッ素を溶出することがなく、環境汚染を回避することができる。 Therefore, according to the desulfurization agent for steel of the embodiment, the melting rate with respect to the molten metal can be increased, and the desulfurization rate can be improved. In addition, since this desulfurizing agent for steel does not contain fluorine, fluorine is not eluted from the slag after desulfurization or dephosphorization, and environmental pollution can be avoided.
（２）前記酸化カルシウム１００質量部に対して酸化マグネシウムの含有量が４０～８０質量部であり、塩化水酸化カルシウムの含有量が２～２０質量部である。このため、各必須成分の機能をバランス良く発揮することができ、脱硫率を高めることができる。 (2) The content of magnesium oxide is 40 to 80 parts by mass and the content of calcium chloride is 2 to 20 parts by mass with respect to 100 parts by mass of the calcium oxide. Therefore, the functions of each essential component can be exhibited in a well-balanced manner, and the desulfurization rate can be increased.
（３）前記鉄鋼用脱硫剤は、塩化水酸化マグネシウム〔ＭｇＣｌ（ＯＨ）〕を含有する。この場合、塩化水酸化マグネシウムが塩化水酸化カルシウムと相乗的に働いて、溶湯中への酸化カルシウムや酸化マグネシウムの溶融性を一層高め、スラグを低粘度化して流動性をさらに改善でき、脱硫性能の一層の向上を図ることができる。 (3) The desulfurizing agent for steel contains magnesium chloride [MgCl (OH)]. In this case, magnesium hydroxide works synergistically with calcium hydroxide, further increasing the meltability of calcium oxide and magnesium oxide in the molten metal, lowering the viscosity of the slag and further improving the fluidity, and desulfurization performance. Can be further improved.
（４）前記鉄鋼用脱硫剤の第１の製造方法は、酸化カルシウム、酸化マグネシウム及び塩化水酸化カルシウムを含有する混合物を加圧成形して造粒物を調製するものである。この製造方法によれば、焼成を行うことなく、加圧成形のみにより鉄鋼用脱硫剤を簡易に製造することができる。 (4) The first method for producing a desulfurizing agent for steel is to prepare a granulated product by pressure-molding a mixture containing calcium oxide, magnesium oxide and calcium chloride. According to this manufacturing method, a desulfurizing agent for steel can be easily manufactured only by pressure forming without firing.
（５）また、鉄鋼用脱硫剤の第２の製造方法は、カルシウム源、マグネシウム源及び塩素源を含有する混合物を造粒して造粒物を成形し、その造粒物を焼成するものである。この製造方法によれば、焼成により鉄鋼用脱硫剤の必須成分を生成させることができ、その必須成分を含む造粒物を得ることができる。 (5) The second method for producing a desulfurizing agent for steel is to granulate a mixture containing a calcium source, a magnesium source and a chlorine source to form a granulated product, and then calcin the granulated product. be. According to this production method, an essential component of a desulfurizing agent for steel can be produced by firing, and a granulated product containing the essential component can be obtained.
（６）前記カルシウム源は炭酸カルシウムであり、前記マグネシウム源は炭酸マグネシウム、水酸化マグネシウム又はドロマイトであり、前記塩素源は塩化カルシウムである。この場合には、焼成後に鉄鋼用脱硫剤の必須成分である酸化カルシウム、酸化マグネシウム及び塩化水酸化カルシウムの生成率を高めることができる。 (6) The calcium source is calcium carbonate, the magnesium source is magnesium carbonate, magnesium hydroxide or dolomite, and the chlorine source is calcium chloride. In this case, it is possible to increase the production rates of calcium oxide, magnesium oxide and calcium chloride, which are essential components of the desulfurizing agent for steel after firing.
（７）前記後者の製造方法において、前記造粒物を焼成した後、破砕又は粉砕して細粒物とした。この場合、鉄鋼用脱硫剤の細粒物により、脱硫性能の向上を図ることができる。 (7) In the latter production method, the granulated product was fired and then crushed or crushed to obtain fine granules. In this case, the desulfurization performance can be improved by using fine particles of the desulfurization agent for steel.
以下、実施例、比較例及び対照例を挙げて前記実施形態をさらに具体的に説明する。なお、以下の各例において、部は質量部を表す。
（実施例１）
炭酸カルシウム７１部に対して炭酸マグネシウム２６部及び塩化カルシウム３部を混合し、常法によりプレス成形して、平均粒子径が５～４０ｍｍの造粒物を得た。この造粒物を１０５０℃で焼成して、平均粒子径が５～４０ｍｍの造粒物として鉄鋼用脱硫剤を調製した。得られた鉄鋼用脱硫剤の組成をＸ線回折によって分析し、その結果を表１に示した。
Hereinafter, the embodiment will be described in more detail with reference to Examples, Comparative Examples, and Control Examples. In each of the following examples, the part represents a mass part.
(Example 1)
26 parts of magnesium carbonate and 3 parts of calcium chloride were mixed with 71 parts of calcium carbonate and press-molded by a conventional method to obtain granulated products having an average particle size of 5 to 40 mm. This granulated product was calcined at 1050 ° C. to prepare a desulfurizing agent for steel as a granulated product having an average particle size of 5 to 40 mm. The composition of the obtained desulfurization agent for steel was analyzed by X-ray diffraction, and the results are shown in Table 1.
（実施例２）
炭酸カルシウム５３部に対して炭酸マグネシウム４０部及び塩化カルシウム７部を混合し、常法によりプレス成形して、平均粒子径が５～４０ｍｍの造粒物を得た。この造粒物を１０５０℃で焼成して、平均粒子径が５～４０ｍｍの造粒物として鉄鋼用脱硫剤を調製した。得られた鉄鋼用脱硫剤の組成をＸ線回折によって分析し、その結果を表１に示した。
(Example 2)
40 parts of magnesium carbonate and 7 parts of calcium chloride were mixed with 53 parts of calcium carbonate and press-molded by a conventional method to obtain granulated products having an average particle size of 5 to 40 mm. This granulated product was fired at 1050 ° C. to prepare a desulfurizing agent for steel as a granulated product having an average particle size of 5 to 40 mm. The composition of the obtained desulfurization agent for steel was analyzed by X-ray diffraction, and the results are shown in Table 1.
（実施例３）
酸化カルシウム６５部に対して酸化マグネシウム３０部及び塩化水酸化カルシウム５部を混合した後、常法によりプレス成形して、平均粒子径が５～４０ｍｍの造粒物として鉄鋼用脱硫剤を調製した。
(Example 3)
After mixing 30 parts of magnesium oxide and 5 parts of calcium chloride with 65 parts of calcium oxide, press molding was performed by a conventional method to prepare a desulfurizing agent for steel as a granulated product having an average particle size of 5 to 40 mm. ..
（実施例４）
実施例１で得られた鉄鋼用脱硫剤を粉砕し、細粒化して平均粒子径が１ｍｍ未満となる細粒物として実施例４の鉄鋼用脱硫剤を調整した。
(Example 4)
The desulfurizing agent for steel obtained in Example 1 was pulverized and finely divided to prepare the desulfurizing agent for steel of Example 4 as fine particles having an average particle size of less than 1 mm.
（実施例５）
実施例１で得られた鉄鋼用脱硫剤に、平均粒子径が５ｍｍ未満となるカーボン粒状品を５部混合して実施例５の鉄鋼用脱硫剤を調整した。
(Example 5)
The steel desulfurizing agent of Example 5 was prepared by mixing 5 parts of a carbon granular product having an average particle size of less than 5 mm with the steel desulfurizing agent obtained in Example 1.
（実施例６）
実施例１で得られた鉄鋼用脱硫剤に、平均粒子径が５ｍｍ未満となるカルシウムアルミネート粒状品を３０部混合して実施例６の鉄鋼用脱硫剤を調整した。
(Example 6)
30 parts of calcium aluminate granular product having an average particle size of less than 5 mm was mixed with the desulfurizing agent for steel obtained in Example 1 to prepare the desulfurizing agent for steel of Example 6.
（比較例１）
炭酸カルシウム９０部に対して塩化カルシウム１０部を混合し、常法によりプレス成形して造粒物を得た。この造粒物を１０５０℃で焼成して比較例１の鉄鋼用脱硫剤を調整した。この鉄鋼用脱硫剤の組成をＸ線回折により分析し、結果を表２に示した。
(Comparative Example 1)
10 parts of calcium chloride was mixed with 90 parts of calcium carbonate and press-molded by a conventional method to obtain granulated products. This granulated product was calcined at 1050 ° C. to prepare a desulfurizing agent for steel of Comparative Example 1. The composition of this desulfurizing agent for steel was analyzed by X-ray diffraction, and the results are shown in Table 2.
（比較例２）
酸化カルシウム９５部に対してカーボン５部を混合した後、常法によりプレス成形して比較例２の鉄鋼用脱硫剤を調整した。
(Comparative Example 2)
After mixing 5 parts of carbon with 95 parts of calcium oxide, the desulfurizing agent for steel of Comparative Example 2 was prepared by press molding by a conventional method.
（比較例３）
酸化カルシウム７０部に対してカルシウムアルミネート粒状品３０部を混合し、常法によりプレス成形して比較例３の鉄鋼用脱硫剤を調整した。
(Comparative Example 3)
30 parts of calcium aluminate granular product was mixed with 70 parts of calcium oxide and press-molded by a conventional method to prepare a desulfurizing agent for steel of Comparative Example 3.
（比較例４）
酸化カルシウム６５部に対して酸化マグネシウム３５部を混合し、常法によりプレス成形して比較例４の鉄鋼用脱硫剤を調整した。
(Comparative Example 4)
35 parts of magnesium oxide was mixed with 65 parts of calcium oxide and press-molded by a conventional method to prepare a desulfurizing agent for steel of Comparative Example 4.
（対照例１）
酸化カルシウム８５部に対してフッ化カルシウム粉を１５部混合し、常法によりプレス成形して対照例１の鉄鋼用脱硫剤を調製した。
(Control Example 1)
15 parts of calcium fluoride powder was mixed with 85 parts of calcium oxide and press-molded by a conventional method to prepare a desulfurizing agent for steel of Control Example 1.
次に、前記実施例１～６、比較例１～４及び対照例１の鉄鋼用脱硫剤について、高周波誘導炉を使用して脱硫率（％）を測定した。
すなわち、高周波誘導炉内に鉄源５０ｋｇと、硫黄含有率が０．１質量％となるように硫化鉄とを混合して溶解させ、溶湯を得た。この溶湯に前記鉄鋼用脱硫剤１ｋｇとスラグ成分とを投入し、１５分間撹拌した。その後に溶湯の一部を採取し、硫黄含有率を分析した。そして、下記の計算式に基づいて脱硫率（％）を算出した。その結果を表４に示した。
Next, the desulfurization rate (%) of the steel desulfurization agents of Examples 1 to 6, Comparative Examples 1 to 4 and Control Example 1 was measured using a high-frequency induction furnace.
That is, 50 kg of an iron source and iron sulfide were mixed and dissolved in a high-frequency induction furnace so that the sulfur content was 0.1% by mass to obtain a molten metal. 1 kg of the desulfurizing agent for steel and a slag component were added to this molten metal, and the mixture was stirred for 15 minutes. After that, a part of the molten metal was collected and the sulfur content was analyzed. Then, the desulfurization rate (%) was calculated based on the following formula. The results are shown in Table 4.
脱硫率（％）＝〔（試験前の硫黄含有率－試験後の硫黄含有率）／試験前の硫黄含有率〕×１００ Desulfurization rate (%) = [(Sulfur content before test-Sulfur content after test) / Sulfur content before test] x 100
次に、前記実施例１～６、比較例１～４及び対照例１の鉄鋼用脱硫剤について脱硫速度を測定した。
すなわち、前記脱硫率（％）の測定において、溶湯に鉄鋼用脱硫剤を投入し、その５分後、１０分後及び１５分後における硫黄含有率を測定し、前記計算式に基づいて脱硫率（％）を算出した。その結果を表５に示した。
Next, the desulfurization rates of the steel desulfurization agents of Examples 1 to 6, Comparative Examples 1 to 4 and Control Example 1 were measured.
That is, in the measurement of the desulfurization rate (%), the desulfurization agent for steel was added to the molten metal, the sulfur content was measured 5 minutes, 10 minutes and 15 minutes after that, and the desulfurization rate was measured based on the above formula. (%) Was calculated. The results are shown in Table 5.
前記特許文献１に記載されているような酸化カルシウムと酸化マグネシウムを含む鉄鋼用脱硫剤（ドロマイトに相当）である比較例４では、高温スラグの粘度が高くなり、よって脱硫率が低くなり、脱硫速度も遅い結果が示された。従って、本発明の鉄鋼用脱硫剤は、特許文献１に記載された従来構成の鉄鋼用脱硫剤に比べて極めて良好な脱硫性能を発揮できることが明らかになった。 In Comparative Example 4, which is a desulfurization agent for steel containing calcium oxide and magnesium oxide (corresponding to dolomite) as described in Patent Document 1, the viscosity of the high-temperature slag is high, and thus the desulfurization rate is low, resulting in desulfurization. The results showed that the speed was also slow. Therefore, it has been clarified that the desulfurization agent for steel of the present invention can exhibit extremely good desulfurization performance as compared with the desulfurization agent for steel having the conventional structure described in Patent Document 1.
（実施例７）
前記実施例１の鉄鋼用脱硫剤について、焼成温度９５０℃、１０５０℃、１１５０℃、１４５０℃と、各焼成温度における焼成後の鉄鋼用脱硫剤中の塩素（Ｃｌ）含有率（質量％）を測定することにより、各焼成温度における塩素揮発量（質量％）を算出した。そして、焼成温度（℃）と塩素揮発量（質量％）との関係を図１に示した。
(Example 7)
Regarding the steel desulfurizing agent of Example 1, the calcination temperature is 950 ° C., 1050 ° C., 1150 ° C., 1450 ° C., and the chlorine (Cl) content (mass%) in the calcination agent for steel after calcination at each firing temperature is determined. By measuring, the amount of chlorine volatilization (mass%) at each firing temperature was calculated. Then, the relationship between the firing temperature (° C.) and the amount of chlorine volatilization (mass%) is shown in FIG.
図１に示したように、焼成温度が１１００℃以上では塩素揮発量が急激に増大した。これは、塩化水酸化カルシウムが分解して塩素が揮発していると考えられることから、有効成分である塩化水酸化カルシウムを含有させるためには、焼成温度は１１００℃以下であることが望ましい。また、炭酸カルシウムが酸化カルシウムに化学変化するための温度は９００℃以上であることが好ましい。従って、焼成温度は９００～１１００℃の範囲であることが好ましい。 As shown in FIG. 1, when the firing temperature was 1100 ° C. or higher, the amount of chlorine volatilized increased sharply. This is because it is considered that calcium chloride is decomposed and chlorine is volatilized. Therefore, it is desirable that the firing temperature is 1100 ° C. or lower in order to contain calcium chloride, which is an active ingredient. Further, the temperature for chemically changing calcium carbonate to calcium oxide is preferably 900 ° C. or higher. Therefore, the firing temperature is preferably in the range of 900 to 1100 ° C.
なお、前記実施形態は、次のように変更して具体化することも可能である。
・前記鉄鋼用脱硫剤の第１の製造方法において、原料として塩化水酸化マグネシウムを用い、その塩化水酸化マグネシウムを酸化カルシウム、酸化マグネシウム及び塩化水酸化カルシウムに混合するように構成してもよい。
The embodiment can be modified and embodied as follows.
-In the first method for producing a desulfurizing agent for steel, magnesium chloride may be used as a raw material, and the magnesium hydroxide may be mixed with calcium oxide, magnesium oxide and calcium chloride.
・前記鉄鋼用脱硫剤の各必須成分の含有量を、溶湯中の硫黄成分との反応に加えて燐成分との反応をも考慮して総合的に設定してもよい。
・前記鉄鋼用脱硫剤の第２の製造方法において、カルシウム源、マグネシウム源又は塩素源は、前記製造方法に示された単一物質に限定されるものではなく、カルシウム、マグネシウム又は塩素を含む物質を複数混合して製造してもよい。
-The content of each essential component of the desulfurization agent for steel may be comprehensively set in consideration of the reaction with the phosphorus component in addition to the reaction with the sulfur component in the molten metal.
-In the second method for producing a desulfurizing agent for steel, the calcium source, magnesium source or chlorine source is not limited to the single substance shown in the production method, but is a substance containing calcium, magnesium or chlorine. May be mixed and manufactured.
・前記実施例６では、実施例１で得られた鉄鋼用脱硫剤に、カルシウムアルミネート粒状品を混合したが、他のアルミニウム系化合物粒状品を混合するようにしてもよい。 -In Example 6, the desulfurizing agent for steel obtained in Example 1 is mixed with a calcium aluminate granular product, but other aluminum-based compound granular products may be mixed.
Claims (7)
酸化カルシウム（ＣａＯ）、酸化マグネシウム（ＭｇＯ）及び塩化水酸化カルシウム〔ＣａＣｌ（ＯＨ）〕を含有することを特徴とする鉄鋼用脱硫剤。 A desulfurizing agent that reacts with sulfur contained in the molten metal in a steel smelting furnace and promotes the removal of the sulfur.
A desulfurizing agent for steel, which contains calcium oxide (CaO), magnesium oxide (MgO) and calcium chloride [CaCl (OH)].
酸化カルシウム、酸化マグネシウム及び塩化水酸化カルシウムを含有する混合物を加圧成形して造粒物を調製することを特徴とする鉄鋼用脱硫剤の製造方法。 The method for producing a desulfurizing agent for steel according to any one of claims 1 to 3.
A method for producing a desulfurizing agent for steel, which comprises preparing a granulated product by pressure-molding a mixture containing calcium oxide, magnesium oxide and calcium chloride.
カルシウム源、マグネシウム源及び塩素源を含有する混合物を造粒して造粒物を成形し、その造粒物を焼成することを特徴とする鉄鋼用脱硫剤の製造方法。 The method for producing a desulfurizing agent for steel according to any one of claims 1 to 3.
A method for producing a desulfurizing agent for steel, which comprises granulating a mixture containing a calcium source, a magnesium source and a chlorine source to form a granulated product, and firing the granulated product.
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