WO2014132762A1 - 還元鉄塊成物の製造方法 - Google Patents
還元鉄塊成物の製造方法 Download PDFInfo
- Publication number
- WO2014132762A1 WO2014132762A1 PCT/JP2014/052665 JP2014052665W WO2014132762A1 WO 2014132762 A1 WO2014132762 A1 WO 2014132762A1 JP 2014052665 W JP2014052665 W JP 2014052665W WO 2014132762 A1 WO2014132762 A1 WO 2014132762A1
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- WO
- WIPO (PCT)
- Prior art keywords
- agglomerate
- melting point
- reduced iron
- iron
- adjusting agent
- Prior art date
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/10—Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/008—Use of special additives or fluxing agents
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/10—Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
- C21B13/105—Rotary hearth-type furnaces
Definitions
- an agglomerate made of a mixture containing an iron oxide-containing substance and a carbonaceous reducing agent is charged on a hearth of a moving bed type heating furnace and heated, and the iron oxide in the agglomerate is heated.
- the present invention relates to a method for producing reduced iron agglomerates by reduction melting.
- iron oxide-containing substance such as iron ore or iron oxide
- carbonaceous reducing agent a reducing agent containing carbon
- Direct reduction iron making methods have been developed to obtain massive (including granular) metallic iron (reduced iron).
- iron oxide-containing substance such as iron ore or iron oxide
- carbonaceous reducing agent a reducing agent containing carbon
- Direct reduction iron making methods have been developed to obtain massive (including granular) metallic iron (reduced iron).
- the agglomerate formed from the above mixture is placed on the hearth of a moving bed type heating furnace and heated in the furnace by gas heat transfer or radiant heat by a heating burner, thereby oxidizing the agglomerate.
- Iron is reduced with a carbonaceous reducing agent, and the obtained reduced iron is subsequently carburized and melted, then aggregated in a lump while separating from by-product slag, then cooled and solidified to form lump metallic iron (reduced iron) Agglomerates).
- Patent Document 1 discloses that “a raw material containing a metal oxide-containing substance and a carbonaceous reducing agent is heated, and after reducing the metal oxide in the raw material, the produced metal is further heated.
- a raw material containing a metal oxide-containing substance and a carbonaceous reducing agent is heated, and after reducing the metal oxide in the raw material, the produced metal is further heated.
- the production of granular metal iron in which a coagulation accelerator for by-product slag is blended in the raw material has been proposed. .
- the present invention has been made in view of such a situation, and an object of the present invention is to heat an agglomerate using a mixture containing at least an iron oxide-containing substance and a carbonaceous reducing agent as a raw material in a moving bed heating apparatus.
- an object of the present invention is to heat an agglomerate using a mixture containing at least an iron oxide-containing substance and a carbonaceous reducing agent as a raw material in a moving bed heating apparatus.
- the method for producing a reduced iron agglomerate according to the present invention that has solved the above problems includes an agglomeration comprising an iron oxide-containing substance, a carbonaceous reducing agent, a melting point adjusting agent, and an auxiliary for the melting point adjusting agent.
- the product is charged on the hearth of a moving bed heating furnace and heated to reduce the iron oxide in the agglomerate, further heat and melt, agglomerate the iron components, and reduce the agglomerated iron agglomeration.
- a method for producing a product wherein an agglomerate containing the melting point adjusting agent having an average particle size of 0.3 mm or less and a content of a particle size of 0.5 mm or less is 55% by mass or more is used. It is what has.
- the melting point modifier (one that directly acts on the gangue component) specifically includes at least one of dolomite and limestone.
- the auxiliary agent for the melting point adjusting agent (which accelerates the reaction of the melting point adjusting agent) include fluorite (calcium fluoride-containing substance).
- the average particle size of the melting point adjusting agent present in the center of the agglomerate is 0.3 mm or less, and the content of the particle size of 0.5 mm or less is 55% by mass or more. preferable. In this case, what is necessary is just to adjust appropriately the average particle diameter of the melting
- Another method of the present invention that can solve the above-mentioned problem is to move an agglomerate comprising an iron oxide-containing substance, a carbonaceous reducing agent, a melting point adjusting agent, and an auxiliary for the melting point adjusting agent to a moving bed type heating.
- iron oxide in the agglomerate is reduced by charging it on the hearth of the furnace and then heated to melt and agglomerate the iron components to produce a reduced iron agglomerate.
- an agglomerate containing an auxiliary for the melting point adjusting agent having an average particle size of 90 ⁇ m or less and a particle size of 50 ⁇ m or less is 35% by mass or more is used.
- the melting point adjusting agent specifically includes at least one of dolomite and limestone.
- the auxiliary agent for the melting point adjusting agent include fluorite (calcium fluoride-containing substance).
- an agglomerate made of a mixture containing at least an iron oxide-containing substance, a carbonaceous reducing agent, a melting point adjusting agent, and an auxiliary for the melting point adjusting agent is placed on the hearth of a moving bed heating furnace.
- the reduced iron agglomerate is produced by reducing and melting the iron oxide in the agglomerate, the average particle size of the melting point modifier is reduced and the content of the predetermined particle size is appropriately set.
- the yield of reduced iron agglomerates with a large particle size can be improved by controlling the average particle size of the auxiliary agent of the melting point modifier or by controlling the content of the predetermined particle size appropriately.
- productivity can be improved by shortening the manufacturing time.
- a reduced iron agglomerate When producing a reduced iron agglomerate, it is composed of a raw material component (hereinafter referred to as “component”) containing an iron oxide-containing substance, a carbonaceous reducing agent, a melting point adjusting agent, and a melting point adjusting agent auxiliary agent.
- component a raw material component
- the melting point adjusting agent and the auxiliary agent for the melting point adjusting agent are appropriately pulverized to have an appropriate size.
- the influence of the size (average particle size) of these components on the yield of reduced iron agglomerates and productivity has not been considered. Rather, excessively pulverizing these components has been thought to lead to discretization of components, hindering reduced iron agglomeration and reducing productivity.
- the present inventors examined from various angles in order to achieve the above object.
- the influence of the average particle size and particle size distribution (content of a predetermined particle size) of the components on the yield of reduced iron agglomerates and productivity was examined.
- the above object can be achieved brilliantly by reducing the average particle size of the melting point adjusting agent and the auxiliary agent for the melting point adjusting agent and appropriately adjusting the content of the predetermined particle size.
- the average particle size of the melting point adjusting agent contained in the agglomerate is 0.3 mm or less, and the content of the particle size of 0.5 mm or less (ratio to the whole melting point adjusting agent) is 55% by mass or more.
- the average particle size of the auxiliary agent for the melting point adjusting agent contained in the agglomerate is 90 ⁇ m or less, and the content of the particle size of 50 ⁇ m or less (the ratio of the melting point adjusting agent to the total auxiliary agent) is 35% by mass or more. There is a need.
- the “average particle size” at this time is the particle size (hereinafter referred to as “D50”) corresponding to 50% by mass (the integrated value is 50% by mass) when the number of particles is counted from the smallest particle size. May be described).
- D50 particle size
- the yield and productivity of the obtained reduced iron agglomerates are improved by using the refined melting point adjusting agent and the auxiliary of the melting point adjusting agent as an agglomerate. The reason can be considered as follows.
- the agglomerates are reduced and melted at a high temperature of 1200 to 1500 ° C., but at the initial stage of the reduction reaction, the reaction proceeds by direct contact between the iron oxide-containing substance and the carbonaceous reducing agent.
- making melting point modifiers such as limestone and dolomite ore and auxiliary agents for melting point modifiers such as fluorite fine particles of gangue components contained in iron oxide-containing substances, melting point modifiers and melting point modifiers.
- the distance from the surface of the adjuvant is shortened (there is a higher probability that it exists near the surface of the melting point modifier or the melting point modifier), and the gangue component comes into contact with the melting point modifier or the melting point modifier adjuvant. Therefore, it is difficult to prevent agglomeration into a reduced iron agglomerate (hereinafter sometimes referred to as “granular reduced iron”). That is, it is considered that a phenomenon that is completely opposite to the conventionally recognized knowledge occurs.
- the content of the particle diameter of 0.5 mm or less in the melting point adjusting agent is preferably 60% by mass or more, more preferably 65% by mass or more (may be 100% by mass).
- the content of the particle diameter of 50 ⁇ m or less in the auxiliary of the melting point adjusting agent is preferably 40% by mass or more, more preferably 45% by mass or more (may be 100% by mass).
- iron oxide-containing substance used in the present invention iron ore, iron sand, non-ferrous smelting residue, etc. may be used.
- carbonaceous reducing agent a carbon-containing material may be used, and for example, coal or coke may be used.
- a binder, an MgO-containing material, a CaO supply material, or the like may be blended as other components.
- the binder for example, polysaccharides (for example, starch such as corn starch, rice flour, and wheat flour) can be used.
- MgO-containing substance for example, an Mg-containing substance extracted from MgO powder, natural ore, seawater, or the like, or magnesium carbonate (MgCO 3 ) can be used.
- MgCO 3 magnesium carbonate
- CaO supply substance quick lime (CaO) etc. can be used, for example.
- the shape of the agglomerate is not particularly limited, and may be, for example, a pellet shape or a briquette shape.
- the size of the agglomerate is not particularly limited, but the particle size (maximum diameter) is preferably 50 mm or less. If the particle size of the agglomerate is excessively increased, the granulation efficiency is deteriorated. Further, heat transfer to the lower part of the pellet is deteriorated and productivity is lowered.
- the lower limit of the particle size is about 5 mm.
- a refined melting point adjusting agent is present only in at least the central part of the agglomerate. That is, when the agglomerate is heated from the outside, the temperature of the central part of the agglomerate is delayed from the surroundings, and the reaction is also delayed.
- the melting point adjusting agent present in the center of the agglomerate.
- the “center” is from the center of the sphere to a position that satisfies the above content (the outer side is referred to as the “outer peripheral part”). Means.
- the refined melting point modifier defined in the present invention is present only in the central part, and the normal average particle size (fine However, it is also possible to make all of the melting point modifiers used a melting point regulator that satisfies the requirements defined in the present invention. Included in embodiments.
- Example 1 An agglomerate made from a mixture containing an iron oxide-containing substance, a carbonaceous reducing agent, a melting point modifier, an auxiliary for the melting point modifier and a binder is prepared, and this agglomerate is placed on the floor of a moving bed type reduction heating furnace. And heated to reduce and melt the iron oxide in the agglomerate to produce a reduced iron agglomerate (granular reduced iron).
- the iron ore having the component composition shown in Table 1 below is used as the oxide-containing substance
- the coal having the component composition shown in Table 2 below is used as the carbonaceous reducing agent
- the component composition shown in Table 3 below is used as the melting point modifier.
- Limestone, dolomite having the component composition shown in Table 4 was used, and fluorite having the component composition shown in Table 5 below was used as an auxiliary agent for the melting point adjusting agent.
- fusing point regulator were changed variously, and the agglomerate was manufactured (postscript Table 7).
- flour as a binder is mixed at a blending ratio shown in Table 6 below in a mixture using melting point modifiers (limestone, dolomite) and melting point modifier adjuvants (fluorite) having different average particle sizes and particle size distributions.
- melting point modifiers limestone, dolomite
- fluorite melting point modifier adjuvants
- An appropriate amount of water was added to this mixture and granulated into raw pellets having a diameter of 19 mm using a tire-type granulator.
- the obtained raw pellets were charged into a dryer and heated at 180 ° C. for 1 hour to completely remove the adhering water, thereby producing pelletized agglomerates (spherical dry pellets).
- the dried pellets are charged into a moving bed type reduction heating furnace with a carbonaceous material (anthracite having a maximum particle size of 2 mm or less), heated in a nitrogen atmosphere at 1450 ° C., and the time required for reductive melting (reaction time) ) was measured.
- a carbonaceous material anthracite having a maximum particle size of 2 mm or less
- Table 7 The results are shown in the following Table 7 together with the average particle size and particle size distribution of the components used (iron ore, coal, limestone, dolomite and fluorite) (only the average particle size is described for iron ore: the same applies hereinafter).
- Table 7 also shows general properties of the dry pellets (apparent density, dry pellet analysis value, etc.).
- measuring methods and standards for main items are as follows.
- the production amount (ton / hour) of granular reduced iron is expressed by the following formula (2).
- the product recovery rate is the mass ratio of the granular reduced iron having a diameter of 3.35 mm or more with respect to the total amount of the granular reduced iron obtained [[+3.35 mm granular iron mass% / total amount of granular reduced iron%. ) ⁇ 100 (%)] (indicated as “+3.35 mm grain iron yield (%)” in Table 7).
- Table 7 in order to quantitatively evaluate the effect of the present invention, Experiment No. 1 agglomerate (dry pellet) is a standard agglomerate, and the productivity when each agglomerate is used when the productivity when this standard agglomerate is used is 1.00. Shown in value (productivity index).
- the content of the average particle diameter (D50) of limestone as the melting point adjusting agent is 0.3 mm or less (300 ⁇ m or less) and the particle diameter is 0.5 mm or less (indicated as “ ⁇ 500 ⁇ m”).
- the average particle size (D50) of dolomite as a melting point modifier is 0.3 mm or less (300 ⁇ m or less), and the particle size is 0.5 mm or less (“ It can be seen that when the content of “ ⁇ 500 ⁇ m” is 55 mass% or more (Experiment No. 3, 4), the yield of granular reduced iron is improved and the productivity is remarkably improved.
- Example 2 A mixture (mixing ratio) containing an iron oxide-containing substance having the same composition as that used in Example 1, a carbonaceous reducing agent, a melting point adjusting agent (limestone, dolomite), a melting point adjusting agent (fluorite), and a binder was also used to produce a dry pellet having a double structure.
- flour as a binder is mixed with a mixture using iron ore, limestone and fluorite having an average particle size and particle size distribution shown in the “center” of Table 8 below, and an appropriate amount of water is added to the mixture.
- a spherical raw pellet with a diameter of 9.5 mm is granulated using a tire type granulator, and a mixture containing limestone with different average particle size and particle size distribution is concentrically formed around it as a core (outer periphery). It was formed into a spherical shape and granulated into a raw pellet having a diameter of 19.0 mm (the content of the mixture at the center was about 12% by mass with respect to the whole pellet).
- the obtained raw pellets were charged into a dryer and heated at 180 ° C. for 1 hour to completely remove the adhering water, thereby producing pelletized agglomerates (double structure pellets).
- the above double structure pellets are charged into a moving bed type reduction heating furnace with a carbonaceous material (anthracite having a maximum particle size of 2 mm or less), heated in a nitrogen atmosphere at 1450 ° C., and the time required for reduction melting ( The reaction time was evaluated in the same manner as in Example 1.
- the results are shown in Table 8 below together with the average particle size (D50) and particle size distribution of the components used (iron ore, coal, limestone, dolomite and fluorite).
- Table 8 below also shows the items evaluated in Examples 1 and 2 (the evaluation method is the same as in Example 1).
- the yield improvement effect of the granular reduced iron can be achieved even if only the central part is intensively refined without refining the whole pellet, and the amount of refined components is further increased. It can be seen that the effects of the present invention can be achieved even in a small state.
- an agglomerate containing an iron oxide-containing substance, a carbonaceous reducing agent, a melting point adjusting agent, and an auxiliary for the melting point adjusting agent is charged on the hearth of a moving bed heating furnace and heated.
- the iron oxide in the agglomerate is reduced, further heated and melted, and the iron component is agglomerated to produce a reduced iron agglomerate having an average particle size of 0.3 mm or less.
- fusing point regulator whose content of a particle diameter of 0.5 mm or less is 55 mass% or more is used.
Abstract
Description
酸化鉄含有物質、炭素質還元剤、融点調整剤、融点調整剤の補助剤およびバインダーを含む混合物を原料とした塊成物を作製し、この塊成物を、移動床式還元加熱炉の床上に供給して加熱し、塊成物中の酸化鉄を還元溶融させて還元鉄塊成物(粒状還元鉄)を製造した。
上記乾燥ペレットを加熱し、酸化鉄を還元溶融して粒状還元鉄を製造したときの生産性を、下記(1)式で示されるように、単位時間(時間)における炉床面積(m2)あたりの粒状還元鉄の生産量(ton)によって評価する。
生産性(ton/m2/時間)=粒状還元鉄の生産性(ton/時間)/炉床面積(m2) …(1)
粒状還元鉄の生産性(粒状還元鉄ton/時間)=塊成物(乾燥ペレット)の装入量(塊成物ton/時間)×塊成物1トンあたりから製造される粒状還元鉄の質量(粒状還元鉄ton/塊成物ton)×製品回収率 …(2)
実施例1で用いたものと同じ成分組成の酸化鉄含有物質、炭素質還元剤、融点調整剤(石灰石、ドロマイト)、融点調整剤の補助剤(蛍石)、およびバインダーを含む混合物(混合率についても表6に示した値と同じ)を用いて、二重構造の乾燥ペレットを作製した。詳細には、下記表8の「中心部」に示す平均粒径および粒度分布の鉄鉱石、石灰石および蛍石を用いた混合物に、バインダーとしての小麦粉を混合し、この混合物に適量の水を添加し、タイヤ型造粒機を用いて直径:9.5mmの球状生ペレットに造粒し、それを核としてその周囲(外周部)に、平均粒径および粒度分布が異なる石灰石を含む混合物を同心球状に成形し、直径:19.0mmの生ペレットに造粒した(中心部の混合物含有量は、ペレット全体に対して12質量%程度)。得られた生ペレットを乾燥機に装入し、180℃で1時間加熱して付着水を完全に除去してペレット状塊成物(二重構造ペレット)を作製した。
Claims (7)
- 酸化鉄含有物質、炭素質還元剤、融点調整剤、および融点調整剤の補助剤を含んでなる塊成物を、移動床式加熱炉の炉床上に装入して加熱することによって、該塊成物中の酸化鉄を還元し、更に加熱して溶融し、鉄成分を凝集させて還元鉄塊成物を製造する方法であって、
平均粒径が0.3mm以下であり、且つ粒子径0.5mm以下の含有量が55質量%以上の前記融点調整剤を含む塊成物を用いることを特徴とする還元鉄塊成物の製造方法。 - 前記融点調整剤は、ドロマイトおよび石灰石の少なくとも1種である請求項1に記載の還元鉄塊成物の製造方法。
- 前記融点調整剤の補助剤は、蛍石である請求項1に記載の還元鉄塊成物の製造方法。
- 前記塊成物の中心部に存在する前記融点調整剤の平均粒径が0.3mm以下であり、且つ粒子径0.5mm以下の含有量が55質量%以上である請求項1~3のいずれかに記載の還元鉄塊成物の製造方法。
- 酸化鉄含有物質、炭素質還元剤、融点調整剤、および融点調整剤の補助剤を含んでなる塊成物を、移動床式加熱炉の炉床上に装入して加熱することによって、該塊成物中の酸化鉄を還元し、更に加熱して溶融し、鉄成分を凝集させて還元鉄塊成物を製造する方法であって、平均粒径が90μm以下であり、且つ粒子径50μm以下の含有量が35質量%以上の前記融点調整剤の補助剤を含む塊成物を用いることを特徴とする還元鉄塊成物の製造方法。
- 前記融点調整剤は、ドロマイトおよび石灰石の少なくとも1種である請求項5に記載の還元鉄塊成物の製造方法。
- 前記融点調整剤の補助剤は、蛍石である請求項5または6に記載の還元鉄塊成物の製造方法。
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CN201480010353.8A CN105074015B (zh) | 2013-02-28 | 2014-02-05 | 还原铁团块的制造方法 |
US14/765,722 US20150361515A1 (en) | 2013-02-28 | 2014-02-05 | Method for producing reduced iron agglomerate |
RU2015140832A RU2625362C2 (ru) | 2013-02-28 | 2014-02-05 | Способ получения агломерата восстановленного железа |
UAA201509171A UA112829C2 (uk) | 2013-02-28 | 2014-05-02 | Спосіб одержання агломерату відновленого заліза |
ZA2015/05487A ZA201505487B (en) | 2013-02-28 | 2015-07-30 | Method for producing reduced iron agglomerate |
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WO2009001663A1 (ja) * | 2007-06-27 | 2008-12-31 | Kabushiki Kaisha Kobe Seiko Sho | 粒状金属鉄の製造方法 |
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JP2012144788A (ja) * | 2011-01-13 | 2012-08-02 | Kobe Steel Ltd | ホットブリケットアイアンの製造方法、およびその製造装置 |
CN102559977A (zh) * | 2012-02-07 | 2012-07-11 | 刘发明 | 粒铁生产新方法 |
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JP2003073722A (ja) * | 2001-06-18 | 2003-03-12 | Kobe Steel Ltd | 粒状金属の製法 |
JP2008523248A (ja) * | 2004-12-07 | 2008-07-03 | ニュー−アイロン テクノロジー リミテッド ライアビリティー カンパニー | 金属鉄ナゲットを生成するための方法およびシステム |
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RU2625362C2 (ru) | 2017-07-13 |
CN105074015A (zh) | 2015-11-18 |
RU2015140832A (ru) | 2017-04-04 |
UA112829C2 (uk) | 2016-10-25 |
JP2014167150A (ja) | 2014-09-11 |
ZA201505487B (en) | 2016-07-27 |
US20150361515A1 (en) | 2015-12-17 |
CN105074015B (zh) | 2018-07-27 |
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