WO2016142970A1 - 溶銑の脱硫処理方法及び溶銑の脱硫処理装置 - Google Patents
溶銑の脱硫処理方法及び溶銑の脱硫処理装置 Download PDFInfo
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- WO2016142970A1 WO2016142970A1 PCT/JP2015/001375 JP2015001375W WO2016142970A1 WO 2016142970 A1 WO2016142970 A1 WO 2016142970A1 JP 2015001375 W JP2015001375 W JP 2015001375W WO 2016142970 A1 WO2016142970 A1 WO 2016142970A1
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- hot metal
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
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- the present invention relates to a hot metal desulfurization treatment method and a hot metal desulfurization treatment apparatus.
- a hot metal desulfurization method using a mechanical stirring type desulfurization processing apparatus has been widely put into practical use.
- an impeller also called “rotary blade” or “stirring blade”
- the hot metal and the desulfurizing agent are vigorously stirred, so that inexpensive CaO (lime) is mainly used.
- CaO-based desulfurizing agent a desulfurizing agent
- the hot metal is desulfurized in a short time to a low sulfur concentration range of 0.002 to 0.004 mass%. Is possible.
- the hot metal desulfurization treatment in the mechanical stirring type desulfurization processing apparatus using the CaO-based desulfurization agent is performed by using a powdered or granular CaO-based desulfurization agent added to the hot metal surface, and a hot metal vortex formed by rotating an impeller.
- the contact area between the CaO-based desulfurizing agent and the molten iron is increased to increase the reaction efficiency of the CaO-based desulfurizing agent.
- the hot metal is stirred by the rotation of the impeller, and the sulfur in the hot metal is sequentially supplied to the reaction interface (desulfurization agent surface), whereby the desulfurization reaction proceeds.
- the reaction vessel containing the hot metal is a pan-shaped cross section, and the impeller is inserted from the upper part of the vessel to the approximate center of the reaction vessel.
- Patent Document 1 the thickness of the refractory to be applied to the bottom of the reaction vessel is changed so that the inner shape of the bottom of the reaction vessel containing the hot metal is not axially symmetric with respect to the central axis of the reaction vessel.
- a technique has been proposed in which the vortex formed by the rotation of the impeller is decentered and the CaO-based desulfurization agent is entrained in the hot metal.
- Patent Document 2 the vortex formed by the rotation of the impeller is decentered by decentering the insertion position of the impeller from the center of the reaction vessel, and further, a powdered CaO system is formed on the formed vortex from a dedicated lance.
- a technique has been proposed in which a desulfurization agent is sprayed together with a carrier gas to perform a desulfurization treatment, thereby realizing a high reaction efficiency of a CaO-based desulfurization agent.
- the height difference of the reaction vessel bottom provided by the height difference of the refractory is reduced by the wear of the refractory, and the effect cannot be maintained for a long time.
- the bottom refractory is worn by the pre-charged cold iron source, and this tendency is large.
- the refractory material applied to the bottom is made thicker for the purpose of maintaining the height difference of the bottom of the reaction vessel over a long period of time, the hot metal storage capacity of the reaction vessel is lowered.
- the above prior art has room for improvement from the viewpoint of stably enjoying the improvement in the reaction efficiency of the CaO-based desulfurization agent.
- an object of the present invention is to provide a hot metal desulfurization treatment method and a hot metal desulfurization treatment apparatus capable of stably increasing the reaction efficiency between the desulfurization agent and the hot metal.
- Hot metal desulfurization treatment in which an impeller is immersed in hot metal contained in a reaction vessel, a desulfurizing agent is added while rotating the impeller, the hot metal and the desulfurizing agent are stirred, and the hot metal is desulfurized.
- a method Using a reaction vessel having an elliptical cross section as the reaction vessel, A hot metal desulfurization treatment method, wherein the desulfurization treatment is performed in a state where an angle ⁇ formed by an axial center line of the reaction vessel and an axis of the impeller is 1.0 to 15.0 degrees.
- the impeller is immersed in the hot metal with the axis of the impeller as a vertical direction, The hot metal as described in [1] above, wherein the desulfurization treatment is performed by inclining the reaction vessel in a range where an inclination angle ⁇ with respect to a vertical direction of an axial center line of the reaction vessel is 1.0 to 15.0 degrees. Desulfurization treatment method.
- the cross section of the reaction vessel has an elliptical shape in which the ratio of the minor axis to the major axis (minor axis / major axis) is 0.70 to 0.95, and any one of the above [1] to [3]
- the hot metal desulfurization characterized in that the reaction vessel and the impeller are installed so that an angle ⁇ formed by an axial center line of the reaction vessel and an axis of the impeller is 1.0 to 15.0 degrees. Processing equipment.
- the impeller is installed such that its axis is in the vertical direction,
- the reaction vessel is installed with its axial centerline fixed in the vertical direction, and the impeller has an inclination angle ⁇ with respect to the vertical direction of the shaft in the range of 1.0 to 15.0 degrees.
- the reaction efficiency between the desulfurizing agent and the hot metal can be stably increased.
- (A) is the schematic of the mechanical stirring desulfurization processing apparatus 10 by one Embodiment of this invention
- (B) is the desulfurization processing method of the hot metal by one Embodiment of this invention using the said desulfurization processing apparatus 10
- It is the schematic which shows the condition which is implementing. It is the schematic of the cross-sectional shape of the hot metal ladle 2 shown in FIG. It is a graph which shows the relationship between the inclination-angle (alpha) with respect to the perpendicular direction of the axial center direction centerline of a hot metal ladle, and a desulfurization rate.
- the inventors have repeatedly studied a method for increasing the reaction efficiency between the hot metal and the desulfurizing agent in the hot metal desulfurization processing method in the mechanical stirring type desulfurization processing apparatus.
- a reaction vessel having an elliptical cross section is used, and the vortex formed by the impeller reacts by performing the desulfurization process with the axial center line of the reaction vessel inclined with respect to the impeller axis. It has been found that it is decentered with respect to the center of the container, which promotes the entrainment of the desulfurizing agent into the hot metal and increases the reaction efficiency of the desulfurizing agent.
- FIG. 1 shows a situation in which a hot metal desulfurization method according to an embodiment of the present invention is implemented using a mechanical stirring desulfurization processing apparatus 10 according to an embodiment of the present invention.
- FIG. 1 (A) shows a state in which an impeller 3 is inserted in a vertical direction from above into a hot metal ladle 2 as a reaction vessel that accommodates the hot metal and is loaded on the transport carriage 1.
- Figure 1 (B) is a diagram showing an inclination angle ⁇ with respect to the vertical direction of the axial center line C L of hot metal pan 2.
- the hot metal ladle 2 includes a trunnion 7 and a trunnion mounting seat 6 to which the trunnion 7 is attached.
- the upper end surface of the hot metal ladle seat 1A of the transport carriage 1 is inclined with respect to the horizontal line, and the trunnion mounting seat 6 of the hot metal pan 2 is received by the inclined upper surface.
- the lower end surface of the trunnion mounting seat 6 is formed to be parallel to the horizontal line when the hot metal ladle 2 is upright. As a result, the hot metal ladle 2 is loaded on the transport carriage 1 with a predetermined inclination angle ⁇ with respect to the vertical direction.
- Hot metal 5 is accommodated in hot metal pan 2.
- the impeller 3 is driven by an electric motor (not shown) and rotates around the impeller shaft 3a as a rotation shaft.
- the impeller shaft 3A is set in the vertical direction, the impeller 3 is immersed in the hot metal 5 and the desulfurizing agent is added while rotating the impeller 3, and the desulfurization process is performed in the state of FIG.
- the vortex formed by the impeller 3 is decentered with respect to the center of the hot metal ladle 2, and as a result, entrainment of the desulfurizing agent into the hot metal 5 is promoted, and the reaction efficiency of the desulfurizing agent is increased.
- the line 5A indicates the hot metal surface when stationary, and the line 5B indicates the hot metal surface when stirring.
- the hot metal ladle 2 is protected by a dust collection hood 4.
- FIG. 1B shows a state where the impeller 3 is positioned on the axial center line C L of the hot metal ladle 2, but the dimensionless distance (r / r 0 ) from the center line is 0. If it is within the range of 0.25, the vortex formed by the impeller 3 is decentered with respect to the center of the hot metal ladle 2, so that the entrainment of the desulfurizing agent into the hot metal 5 is promoted, and the reaction efficiency of the desulfurizing agent is increased.
- r is the shortest distance between the axial center line C L and the center of the hot metal pan 2 of the impeller 3 (m), r 0 represents the radius (m) of the hot metal pan. That is, according to the present invention, it is suggested that even when the insertion position of the impeller deviates from the target, the desulfurization process is not required again.
- FIG. 1 shows a state in which a hot metal ladle 2 having an elliptical cross section is inclined toward the major axis with the minor axis of the ellipse as the center of rotation.
- the major axis of the ellipse may be tilted toward the minor axis with the rotation center.
- FIG. 2 the schematic of the cross-sectional shape of the hot metal ladle 2 shown in FIG. 1 is shown.
- Reference numeral 8 is refractory layer of hot metal pan sidewalls shown in FIG. 2
- D L is the long axis direction of the inner diameter of the sidewall refractory layer cross-section is oval
- D S is the cross section is oval sidewall refractories This is the inner diameter in the minor axis direction of the material layer.
- the structure of the hot metal ladle itself is not particularly limited, but as shown in FIG. 1B, the bottom surface of the hot metal ladle is substantially flat, and the wall surface is attached substantially perpendicular to the bottom surface. A structure is desirable.
- Table 1 shows the specifications of the mechanical stirring type desulfurization processing apparatus shown in FIG. 1 and examples of desulfurization processing conditions when this mechanical stirring type desulfurization processing apparatus is used.
- the inclination direction of the hot metal ladle 2 is the major axis side or the short axis side of the elliptical shape, and the inclination angle ⁇ of the hot metal ladle 2 is 0 to 20.0 degrees.
- the desulfurization treatment test was performed on the hot metal 5 using a desulfurizing agent, and the desulfurization rate at that time was measured.
- the impeller 3 was inserted in the vertical direction.
- the desulfurizing agent a CaO—CaF 2 desulfurizing agent containing 10% by mass of fluorite (CaF 2 ) was used, and the amount of desulfurizing agent used was constant 6.0 kg / molten iron-ton in all tests. .
- Desulfurization rate (%) ⁇ (Sulfur concentration in hot metal before treatment (mass%))-(Sulfur concentration in hot metal after treatment (mass%)) ⁇ x 100 / (Sulfur concentration in hot metal before treatment (mass%)) ... ( 1)
- the basic unit of desulfurizing agent used is the same, that is, under the same amount of desulfurizing agent used per ton of hot metal, the higher the desulfurization rate, the higher the reaction efficiency between the desulfurizing agent and hot metal. .
- FIG. 3 shows the relationship between the tilt angle ⁇ of the hot metal ladle and the desulfurization rate by comparing the case where the hot metal ladle is tilted to the major axis side and the minor axis side of the elliptical shape. is there.
- the inclination angle ⁇ increases with an increase in the inclination angle ⁇ in the range up to about 10.0 degrees. It was found that the desulfurization rate was improved, the desulfurization rate was 90% or more when the inclination angle ⁇ was 3.0 degrees or more, the desulfurization rate was 95% or more when the inclination angle ⁇ was 6.0 degrees or more. In addition, there was no difference in the desulfurization rate between the case of the elliptical major axis side and the minor axis side, and it was confirmed that there was no effect on the desulfurization rate in the tilt direction.
- the inclination direction of the reaction vessel may be either the elliptical long axis side or the short axis side.
- the inclination angle ⁇ is particularly preferably in the range of 6.0 to 13.0 degrees because a high desulfurization rate of 95% or more can be obtained.
- the reaction vessel may have any shape as long as the cross section of the refractory layer 8 on the side wall is elliptical, but the ratio of the minor axis to the major axis of the ellipse (minor axis / major axis) DS / D L is preferably an elliptical shape of 0.70 to 0.95.
- the ratio (minor axis / major axis) is less than 0.70, it is necessary to increase the major axis in order to ensure the hot metal capacity of the reaction vessel, and it is difficult to carry out within the range of existing equipment.
- the hot metal stirring form is similar to that of a circular reaction vessel, and the reaction efficiency of the desulfurizing agent and hot metal is increased to a target value. It becomes difficult.
- reaction vessel having an elliptical cross section it is essential to use a reaction vessel having an elliptical cross section as the reaction vessel.
- the reason for this is that in a reaction vessel having an elliptical cross section, the symmetry of the flow in the bath formed around the impeller is broken, so that the hot metal is stirred compared to a reaction vessel having a circular cross section. Because it is promoted.
- group desulfurization agent whose content of CaO exceeds 50 mass% is preferable.
- quick lime (CaO), slaked lime (Ca (OH) 2 ), limestone (CaCO 3 ), calcined dolomite (MgO ⁇ CaO), etc. may be used alone, and alumina (Al 2 O 3 ) may be used. and fluorite may be a mixture of (CaF 2).
- the means for inclining the reaction vessel and loading it onto the transport carriage is not limited to that shown in FIG. 1, and any means may be used.
- a reaction vessel is installed with its axial center line fixed in the vertical direction, and the impeller has an inclination angle ⁇ of 1.0 to 1.0 with respect to the vertical direction of the shaft. It can also be installed with an inclination in the range of 15.0 degrees.
- the axial center line of the reaction vessel is fixed in the vertical direction, and the impeller is inclined in the range where the inclination angle ⁇ with respect to the vertical direction of the impeller shaft is 1.0 to 15.0 degrees.
- desulfurization treatment can also be performed.
- the vortex formed by the impeller is decentered with respect to the center of the reaction vessel.
- the desulfurization agent is entrained in the hot metal, and the reaction efficiency of the desulfurization agent is increased. That is, in the present invention, it is important to perform the desulfurization treatment in a state where the angle ⁇ formed by the axial center line of the reaction vessel and the impeller axis is 1.0 to 15.0 degrees.
- the conventional conditions in which the hot metal ladle is not inclined in the mechanical stirring type desulfurization apparatus specification and desulfurization treatment conditions shown in FIG. 1 and Table 1, and the inclination angle ⁇ in the major axis direction and the minor axis direction of the elliptical shape, respectively.
- the conditions changed to three levels of 1.0 degrees, 7.0 degrees, and 15.0 degrees with respect to the inclination angle ⁇ in the major axis direction and the minor axis direction of the elliptical shape, respectively.
- hot metal desulfurization treatment tests were carried out on several levels for each level, and the sulfur concentration of the hot metal before and after the desulfurization treatment was investigated. Furthermore, for some conditions, the position of the impeller is changed so that the above-described dimensionless distance (r / r 0 ) becomes three levels of 0 , 0.25, and 0.3, and several tens of charges are obtained.
- a hot metal desulfurization treatment test was conducted, and the sulfur concentration of the hot metal before and after the desulfurization treatment was investigated. In the test, the impeller was inserted vertically.
- CaO-based desulfurizing agent a CaO—CaF 2 -based desulfurizing agent containing 10% by mass of fluorite was used. Test conditions and survey results are shown in Table 2.
- “average value of sulfur concentration in hot metal” means the average value of all charges in each example, and “maximum value of sulfur concentration in hot metal” means the maximum of all charges in each example. This means the sulfur concentration of the charge that indicates the sulfur concentration of the metal.
- the ratio of the charge in which the sulfur concentration in the molten iron after treatment exceeds 0.010 mass% is the percentage of the total molten metal in each example. It means the ratio of the charge in which the sulfur concentration exceeds 0.010 mass%.
- the reaction efficiency between the desulfurizing agent and the hot metal can be stably increased.
Abstract
Description
[1]反応容器に収容された溶銑にインペラーを浸漬し、該インペラーを回転させつつ脱硫剤を添加して、前記溶銑と前記脱硫剤とを攪拌し、前記溶銑を脱硫処理する溶銑の脱硫処理方法であって、
前記反応容器として横断面が楕円形状である反応容器を用い、
前記反応容器の軸方向中心線と前記インペラーの軸とのなす角θを1.0~15.0度とした状態で、前記脱硫処理を行うことを特徴とする溶銑の脱硫処理方法。
前記反応容器の軸心方向中心線の鉛直方向に対する傾斜角度αが1.0~15.0度となる範囲で前記反応容器を傾斜させて前記脱硫処理を行う、上記[1]に記載の溶銑の脱硫処理方法。
前記インペラーの軸の鉛直方向に対する傾斜角度βが1.0~15.0度となる範囲で前記インペラーを傾斜させて前記脱硫処理を行う、上記[1]に記載の溶銑の脱硫処理方法。
前記溶銑を撹拌され、回転させて前記溶銑と前記脱硫剤とを撹拌するインペラーと、を有し、
前記反応容器の軸方向中心線と前記インペラーの軸とのなす角θが1.0~15.0度となるように、前記反応容器及び前記インペラーが設置されることを特徴とする溶銑の脱硫処理装置。
前記反応容器は、その軸心方向中心線の鉛直方向に対する傾斜角度αが1.0~15.0度となる範囲で傾斜して設置される、上記[5]に記載の溶銑の脱硫処理装置。
脱硫率(%)={(処理前溶銑中硫黄濃度(質量%))-(処理後溶銑中硫黄濃度(質量%))}×100/(処理前溶銑中硫黄濃度(質量%))…(1)
使用する脱硫剤の原単位が同一の場合には、つまり、溶銑トンあたりの脱硫剤の使用量が同じ条件においては、脱硫率が高いほど脱硫剤と溶銑との反応効率が高いことを意味する。
1 輸送台車
1A 溶銑鍋受座
2 溶銑鍋
3 インペラー
3A インペラー軸
4 集塵フード
5 溶銑
5A 静止時の溶銑湯面
5B 攪拌時の溶銑湯面
6 トラニオン取付座
7 トラニオン
8 耐火物層
α 傾斜角度
CL 溶銑鍋の軸心方向中心線
DL 長軸方向の内径
DS 短軸方向の内径
Claims (8)
- 反応容器に収容された溶銑にインペラーを浸漬し、該インペラーを回転させつつ脱硫剤を添加して、前記溶銑と前記脱硫剤とを攪拌し、前記溶銑を脱硫処理する溶銑の脱硫処理方法であって、
前記反応容器として横断面が楕円形状である反応容器を用い、
前記反応容器の軸方向中心線と前記インペラーの軸とのなす角θを1.0~15.0度とした状態で、前記脱硫処理を行うことを特徴とする溶銑の脱硫処理方法。 - 前記インペラーの軸を鉛直方向として前記インペラーを前記溶銑に浸漬させ、
前記反応容器の軸心方向中心線の鉛直方向に対する傾斜角度αが1.0~15.0度となる範囲で前記反応容器を傾斜させて前記脱硫処理を行う、請求項1に記載の溶銑の脱硫処理方法。 - 前記反応容器の軸心方向中心線を鉛直方向に固定し、
前記インペラーの軸の鉛直方向に対する傾斜角度βが1.0~15.0度となる範囲で前記インペラーを傾斜させて前記脱硫処理を行う、請求項1に記載の溶銑の脱硫処理方法。 - 前記反応容器の横断面は、短軸と長軸との比(短軸/長軸)が0.70~0.95の楕円形状である、請求項1~3のいずれか一項に記載の溶銑の脱硫処理方法。
- 溶銑を収容し脱硫剤が添加される、横断面が楕円形状の反応容器と、
前記溶銑に浸漬され、回転させて前記溶銑と前記脱硫剤とを撹拌するインペラーと、を有し、
前記反応容器の軸方向中心線と前記インペラーの軸とのなす角θが1.0~15.0度となるように、前記反応容器及び前記インペラーが設置されることを特徴とする溶銑の脱硫処理装置。 - 前記インペラーは、その軸が鉛直方向となるように設置され、
前記反応容器は、その軸心方向中心線の鉛直方向に対する傾斜角度αが1.0~15.0度となる範囲で傾斜して設置される、請求項5に記載の溶銑の脱硫処理装置。 - 前記反応容器は、その軸心方向中心線が鉛直方向に固定されて設置され、
前記インペラーは、その軸の鉛直方向に対する傾斜角度βが1.0~15.0度となる範囲で傾斜して設置される、請求項5に記載の脱硫処理装置。 - 前記反応容器の横断面は、短軸と長軸との比(短軸/長軸)が0.70~0.95の楕円形状である、請求項5~7のいずれか一項に記載の溶銑の脱硫処理装置。
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BR112015008688A BR112015008688A2 (pt) | 2015-03-12 | 2015-03-12 | método de tratamento de dessulfuração de metal quente e aparelho para tratamento de dessulfuração de metal quente |
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JP2007262501A (ja) * | 2006-03-29 | 2007-10-11 | Jfe Steel Kk | インペラーを用いた溶融金属の攪拌方法 |
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