WO2011021577A1 - 高炉用の非焼成含炭塊成鉱およびその製造方法 - Google Patents

高炉用の非焼成含炭塊成鉱およびその製造方法 Download PDF

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WO2011021577A1
WO2011021577A1 PCT/JP2010/063726 JP2010063726W WO2011021577A1 WO 2011021577 A1 WO2011021577 A1 WO 2011021577A1 JP 2010063726 W JP2010063726 W JP 2010063726W WO 2011021577 A1 WO2011021577 A1 WO 2011021577A1
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content
carbon
mass
sio
cao
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PCT/JP2010/063726
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English (en)
French (fr)
Japanese (ja)
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謙一 樋口
浩一 横山
和也 国友
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新日本製鐵株式会社
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Priority to JP2010545717A priority Critical patent/JP4808819B2/ja
Priority to BR112012003786-2A priority patent/BR112012003786B1/pt
Priority to KR1020127003858A priority patent/KR101475125B1/ko
Priority to IN994DEN2012 priority patent/IN2012DN00994A/en
Priority to CN201080036478.XA priority patent/CN102482730B/zh
Publication of WO2011021577A1 publication Critical patent/WO2011021577A1/ja

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/242—Binding; Briquetting ; Granulating with binders
    • C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/007—Conditions of the cokes or characterised by the cokes used
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/008—Composition or distribution of the charge
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/242—Binding; Briquetting ; Granulating with binders
    • C22B1/244—Binding; Briquetting ; Granulating with binders organic
    • C22B1/245—Binding; Briquetting ; Granulating with binders organic with carbonaceous material for the production of coked agglomerates

Definitions

  • the present invention relates to a non-fired carbon-containing agglomerated ore for a blast furnace, and more particularly, to a non-fired carbon-containing agglomerated mineral that can lower the lower slag melting point of the blast furnace and reduce the reducing material ratio of the blast furnace.
  • a method for producing an unfired carbon-containing agglomerated mineral a method is known in which iron-making dust is granulated into pellets, and then the pellets are cured and hardened.
  • the particle size distribution of the dust is adjusted to an appropriate range, a binder such as quick lime and cement and 5 to 15% of water are added, and the mixture is granulated with a disk pelletizer or the like. I have pellets.
  • a carbon interior non-fired agglomerated mineral is manufactured by blending an iron-containing iron raw material and a carbon-based carbon material, adding a binder, kneading, molding, and curing.
  • This carbon-incorporated non-calcined agglomerated mineral has 80 to 120% of the theoretical carbon amount required to reduce iron oxide contained in the iron oxide-containing raw material into metallic iron.
  • the binder is selected so that the crushing strength at room temperature is 7850 kN / m 2 or more, and mixing, molding, and curing are performed. Since the reduction reaction occurs due to the carbon contained in the iron oxide in the unfired carbon-containing agglomerated mineral, the reduction rate can be improved.
  • the carbon content is limited to ensure strength, and the effect of reducing the reducing material ratio in a sufficient blast furnace cannot be obtained.
  • the amount of heat absorbed by the dehydration reaction of the binder in the blast furnace increases. Thereby, there existed a fault which forms a low-temperature heat preservation zone and promotes reduction
  • quick lime and CaO-type cement are often used as a binder, CaO content in a non-baking carbon-containing agglomerated mineral becomes high.
  • the unfired carbon-containing agglomerated material melts and drops at a low temperature
  • the unfired carbon-containing agglomerated material melts early in the vertical furnace and easily flows down the gap between the raw materials filled in the furnace. .
  • the period of contact with the coke becomes longer.
  • the reduction reaction of the powdered iron ore in the unfired carbon-containing agglomerated mineral and the carburization reaction of the generated iron can be promoted.
  • Patent Document 2 attention is paid to the fact that the melting temperature can be reduced by coating CaCO 3 even in the case of powdered iron ore in which surface concentration of SiO 2 and Al 2 O 3 has occurred. And based on this attention point, the non-baking carbon-containing agglomerated mineral in which the pulverized iron ore and the flux were couple
  • Patent Document 2 discloses a coal-containing agglomerated mineral containing 23.3 to 24.6% by mass of coal. Generally, the carbon content of coal is about 70%, and the remainder is ash. And volatiles. Therefore, the carbon content in the carbon-containing agglomerated ore corresponds to 16 to 17% by mass.
  • Non-Patent Document 2 it is reported that when 2% of MgO is added to dust cold pellets (cement bonded) containing 7% of carbon, high-temperature ventilation resistance is lowered.
  • FIG. 8 shows a conventional sintered ore (total Fe content 58.5%, FeO 8%, CaO 10%, SiO 2 5%, Al 2 O 3 1.7%, MgO 1.0%) and a large carbon content.
  • the relationship between temperature and reduction rate is shown for carbon-containing agglomerated ores. Referring to FIG. 8, it can be seen that, in the carbon-containing agglomerated ore, the reduction proceeds remarkably in a low temperature region as compared with the conventional sintered ore. This is a major feature of the carbon-containing agglomerates with a high carbon content.
  • slag melting point CaO—SiO 2 —Al 2 O 3 —MgO—FeO
  • fusing point was computed from the reduction rate supposing that all unreduced iron exists as FeO among the iron components of a sintered ore and a carbon-containing agglomerated ore.
  • the melting point means the temperature at which everything becomes a liquid phase, and the melt is generated even below the melting point. However, when the melting point is high, the melt amount is low, so the melting point indirectly represents the melt amount.
  • the melting point of the slag is almost the same as the sample temperature at 1200 to 1400 ° C., and it is considered that a large amount of melt is generated in this temperature range.
  • the slag melting point remarkably increases from around 900 ° C. and reaches 1600 ° C. or more. Therefore, in a carbon-containing agglomerated ore with a high carbon content, it is considered that the reduction proceeds with a very small amount of melt. For this reason, since a solid phase always exists, the aggregation of the metal is inhibited, which causes dripping deterioration.
  • the reduction of the carbon-containing agglomerated ore with a high carbon content proceeds remarkably in a low temperature region as compared with the sintered ore, and the reduction proceeds with a very small amount of melt. For this reason, the knowledge about the dripping characteristic in the reduction progress of the sintered ore cannot be applied as it is to the carbon-containing agglomerated ore having a high carbon content.
  • the component condition of the carbon-containing agglomerated mineral having the optimum slag melting point for blast furnace use is specified. And based on this research result, this invention aims at provision of the non-baking carbon-containing agglomerated mineral which can lower the slag melting
  • the present inventors have, by a specific range of CaO / SiO 2 of gangue components of carbonaceous mass Naruko (1.0-2.0), it is possible to reduce the furnace bottom slag melting point, excellent metal dropwise We found a non-fired carbon-containing agglomerated mineral product that can achieve the desired properties.
  • CaO / SiO 2 of the gangue component of unfired carbon-containing agglomerated minerals 1.0-2.0 adjust the blending amount of high SiO 2 -containing ore and MgO-containing auxiliary materials as described later It has also been found to be preferable.
  • the non-fired carbon-containing agglomerated ore for a blast furnace is obtained by mixing and kneading an iron-containing raw material, a carbon-containing raw material, and a binder, forming a kneaded product, and then obtaining the molded product.
  • the carbon content (TC) is 18 to 25% by mass
  • the ratio CaO content (% by mass) of the gangue component to SiO 2 content (% by mass) is CaO / SiO 2. 1.0 to 2.0.
  • the CaO content (% by mass), the SiO 2 content (% by mass), the Al 2 O 3 content (% by mass), and the MgO content Value of gangue ((CaO + SiO 2 + Al 2 O 3 + MgO) / (100 ⁇ carbon content (TC))) expressed by (mass%) and carbon content (TC) (mass%) May be 0.25 or less, and the MgO content may be 0.5 mass% or more.
  • the binder content may be 5 to 10% by mass.
  • a method for producing a non-fired carbon-containing agglomerated ore for a blast furnace is a method of mixing a kneaded material, a carbon-containing material, and a binder, kneading, forming a kneaded product, and obtaining a molded product.
  • the ore brand is such that the ratio CaO / SiO 2 between the CaO content (mass%) and the SiO 2 content (mass%) of the gangue component is 1.0 to 2.0.
  • the uncalcined carbonaceous mass Naruko manufacturing method for a blast furnace according to one embodiment of the present invention, CaO content of the non-calcined carbonaceous mass Naruko (wt%), SiO 2 content (wt%), Al 2 Amount of gangue expressed by O 3 content (% by mass), MgO content (% by mass) and carbon content (TC) (% by mass) ((CaO + SiO 2 + Al 2 O 3 + MgO) / (100 ⁇
  • the blending conditions are adjusted so that the value of carbon content (TC))) is 0.25 or less and the MgO content is 0.5 mass% or more. May be.
  • the binder content may be adjusted in the range of 5 to 10% by mass.
  • the auxiliary material selected from quartzite, serpentine, peridotite, dolomite, nickel slag, magnesite, and brucite, and one or both of high-SiO 2 containing ores are further blended, It said that the carbon content of non-calcined carbonaceous mass Naruko (T.C.) from 18 to 25 mass%, and the ratio CaO / SiO 2 of CaO content and SiO 2 content is 1.0-2.0 to, may be adjusted the amount of the auxiliary materials and high SiO 2 containing ores.
  • T.C. non-calcined carbonaceous mass Naruko
  • the non-fired coal-containing agglomerated ore for blast furnaces is not only for non-fired carbon-containing agglomerated minerals, but to improve the reduction rate of the main blast furnace iron-containing raw materials such as sintered ores. Has a sufficient carbon content. Furthermore, in the operation of the blast furnace, the slag melting point can be suppressed lower than before, and excellent reduction product slag characteristics (metal dripping properties) can be achieved. For this reason, when the non-baking carbon-containing agglomerated mineral which concerns on 1 aspect of this invention is used as a part of iron-containing raw material for blast furnaces, favorable air permeability can be implement
  • the method for producing a non-fired carbon-containing agglomerated mineral for a blast furnace since a non-fired process is applied, it is possible to save energy and reduce CO 2 compared to the fired process. Further, the dust generated in the iron making process can be recycled as an iron-containing raw material and a carbon material by a relatively inexpensive and simple method.
  • Binder is a diagram showing a relationship (cement) the amount (and CaO / SiO 2 ratio) and cold crushing strength. It is a diagram showing the relationship between the sintered ore and non-calcined carbonaceous mass Naruko CaO / SiO 2 and slag melting point when MgO content is 1.5%.
  • CaO / SiO 2 is a diagram showing the relationship between the sintered ore and non-calcined carbonaceous MgO content mass Naruko and slag melting point when it is 1.5. It is a diagram showing the relationship between the non-calcined carbonaceous mass Naruko and sinter the CaO / SiO 2 and metal dropping rate.
  • the unfired carbon-containing agglomerated ore for a blast furnace is obtained by mixing and kneading an iron-containing raw material, a carbon-containing raw material, and a binder, molding the kneaded material to obtain a molded body, and then curing the molded body. Manufactured by the method.
  • the carbon content (TC) is 18 to 25% by mass, and the gangue component CaO / SiO 2 is 1.0 to 2.0. As a result, an optimum slag melting point for blast furnace use can be obtained.
  • the carbon content (TC) of the unfired carbon-containing agglomerated mineral is 18 to 25% by mass, preferably 20 to 23% by mass. If the carbon content is less than 18%, even if the gangue component is adjusted, the effect of reducing the reducing material ratio is reduced. When the carbon content exceeds 25% by mass, it becomes impossible to have the minimum cold crushing strength necessary for use in blast furnaces.
  • the ratio CaO / SiO 2 (also referred to as basicity) of the CaO content (% by mass) and the SiO 2 content (% by mass) of the gangue component of the unfired carbon-containing agglomerated mineral is 1.0 to 2.0. Yes, preferably 1.4 to 1.7.
  • CaO / SiO 2 By setting CaO / SiO 2 to a low value within the range of 1.0 to 2.0, the metal dripping rate can be improved. If CaO / SiO 2 is more than 2.0, the metal dropping rate is less than 50%. When CaO / SiO 2 is less than 1.0, the effect of improving the metal dropping rate is saturated.
  • the value of the gangue amount is preferably 0.25 or less, more preferably 0.22 to 0.25.
  • the gangue amount is a value calculated by the following equation.
  • Amount of gangue (CaO + SiO 2 + Al 2 O 3 + MgO) / (100 ⁇ carbon content (TC))
  • CaO in the formula, SiO 2, Al 2 O 3 , and MgO is, CaO content in the non-calcined carbonaceous mass Naruko respectively (wt%), SiO 2 content (wt%), Al 2 O 3 Content (mass%) and MgO content (mass%) are shown.
  • the MgO content is preferably 0.5% by mass or more, more preferably 0.6 to 2.0% by mass.
  • the method for producing a non-fired carbon-containing agglomerated ore for a blast furnace includes a step of forming a molded body to obtain a molded body by mixing and kneading the iron-containing raw material, the carbon-containing raw material, and the binder, and molding the kneaded product. Then, the step of curing the shaped body to obtain a non-fired carbon-containing agglomerated mineral is provided.
  • the carbon content (TC) of the unfired carbon-containing agglomerated mineral is 18 to 25% by mass
  • One or more blending conditions selected from the group consisting of ore brands and binder blending amounts are adjusted so that the CaO / SiO 2 ratio is 1.0 to 2.0.
  • iron-containing raw materials used in this embodiment sintered dust generated in the iron making process, iron-containing dust such as blast furnace dust, pellet feed smaller in particle size than powdered iron ore for sintering, and powdered iron ore for sintering are crushed And / or fine pulverized iron ore produced by sizing.
  • the contents of gangue components such as iron and SiO 2 vary greatly. Therefore, the CaO / SiO 2 value can be adjusted by selecting the ore brand to be used. In particular, the CaO / SiO 2 value is greatly affected by the amount of ore having a high SiO 2 content. Examples of ore brands used in the present embodiment include Indian high Siricious, robe river, Yandy Kujina, Rio Doce (Itabira), Mara Mamba, and the like.
  • Examples of the carbon-containing raw material used in this embodiment include blast furnace primary ash, coke dust, fine coke, and anthracite.
  • binders used in the present embodiment include fine powders mainly composed of blast furnace granulated slag and aging binders composed of alkali stimulants, quicklime, Portland cement, bentonite, and the like.
  • the blending amount (addition amount) of the binder can be appropriately determined in consideration of other blending conditions and the like.
  • the blending amount of the binder is too small, it becomes difficult to sufficiently maintain the cold rolling strength of the unfired carbon-containing agglomerated mineral.
  • the amount of slag of a non-baking carbon-containing agglomerated mineral will increase, and the air permeability of a furnace lower part will become unstable. Thereby, the stable reducing material ratio reduction effect is not acquired.
  • the binder (cement) content decreased (CaO / SiO 2 decreased), the cold strength decreased. Then, CaO / SiO 2 is of less than 1.0 (Binder (cement) amount is less than 5 wt%), has become difficult to maintain the crush strength 100 kg / cm 2 between cold.
  • the binder (cement) content is preferably 5% by mass or more.
  • the amount of the binder (cement) exceeds 10% by mass, the amount of gangue may be increased. For this reason, it is preferable to make a binder (cement) compounding quantity into 10 mass% or less. Therefore, the blending amount of the binder is preferably 5 to 10% by mass.
  • the binder content is preferably 5 to 10% by mass, and as described above, a cold crushing strength of 100 kg / cm 2 or more can be achieved. .
  • the auxiliary material includes quartzite mainly composed of SiO 2 , serpentinite mainly composed of MgO, peridotite, dolomite, nickel slag, magnesite, and brucite.
  • the blending amounts of these auxiliary raw materials and high SiO 2 -containing ore are automatically determined. Therefore, the amount of these auxiliary materials and high SiO 2 containing ore is not particularly limited, is suitably determined according to the chemical composition of non-calcined carbonaceous mass Naruko.
  • CaO / SiO 2 is determined by the amount of CaO and the amount of SiO 2 contained in the raw material to be blended.
  • CaO is mainly contained in binders, blast furnace primary ash used as a carbon-containing raw material, sintered dust and converter dust used as an iron-containing raw material, and the amount of these should be adjusted appropriately.
  • the CaO content can be adjusted.
  • a cement-based binder having a high CaO content is used as the binder, in order to adjust the CaO content so that CaO / SiO 2 is 1.0 to 2.0, the amount of the binder itself is decreased. There is a need. For this reason, it is necessary to consider whether sufficient cold crushing strength is obtained.
  • SiO 2 and MgO are mainly contained in binders, blast furnace primary ash used as a carbon-containing raw material, sintered dust used as an iron-containing raw material, ash in carbon-based weight loss, and the like.
  • CaO / SiO 2 in the non-calcined carbonaceous mass Naruko is 1.0 to 2.0 regardless of the mode of addition of SiO 2 (the form of raw material containing SiO 2), a constant Can have an effect.
  • MgO if the MgO content is 0.5 mass% or more, a certain effect can be brought about regardless of the addition form of MgO (form of raw material containing MgO).
  • the numerical ranges of the carbon content (TC), CaO / SiO 2 , gangue amount, and MgO content are defined. Experimental results showing the critical significance of these numerical ranges are shown below.
  • the reduction rate at 1400 ° C. of a sintered ore and an unfired carbon-containing agglomerated mineral with CaO / SiO 2 of 1.5 and MgO content of 1.5% was measured. Then, assuming that all unreduced iron is present in the slag as FeO, the FeO concentration in the slag was calculated from the obtained reduction rate.
  • the FeO concentration in the slag was 34% when the sintered ore was used and 2% when the unfired carbon-containing agglomerated mineral was used.
  • the relationship between the CaO / SiO 2 value or MgO content and the slag melting point was investigated for sintered ore and unfired carbon-containing agglomerated ore.
  • the slag melting point (CaO-SiO 2 -Al 2 O 3 -MgO-FeO) was determined from the simulation by a computer.
  • FIG. 2 shows the relationship between CaO / SiO 2 and slag melting point when the MgO content is 1.5%.
  • FIG. 3 shows the relationship between the MgO content and the slag melting point when CaO / SiO 2 is 1.5.
  • the degree of influence of CaO / SiO 2 on the slag melting point differs between sintered ore and unfired carbon-containing agglomerated ore. This is due to the difference in the reduction rate at high temperature (that is, the FeO concentration in the slag).
  • the slag melting point decreases by 278 ° C.
  • the unburned carbon-containing agglomerated ore has a high reduction rate at low temperatures.
  • a non-calcined carbon-containing agglomerate with a high carbon content as compared with a calcined agglomerate with a low carbon content, it is reduced earlier in the upper part of the blast furnace.
  • the amount of the unreduced iron component (the amount of FeO) remaining in the slag that is reduced at the top and moves to the bottom decreases.
  • the amount of FeO in the slag decreases, the slag melting point increases. As described above, the melting point of slag depends on the basicity (CaO / SiO 2 ).
  • the dropping behavior is not determined only by the slag melting point, but also depends on the slag amount and other slag physical properties (viscosity, wettability with metal, etc.). For this reason, the dropping behavior is a complicated phenomenon and has not been completely elucidated at present. However, it is clear that the sintered ore and non-fired carbon-containing agglomerated minerals have different component conditions for promoting the metal dropping by lowering the slag melting point.
  • the dripping characteristic of the non-baking carbon-containing agglomerated mineral which has various gangue components was investigated using the load softening test apparatus.
  • the iron-containing raw material and the carbon-containing raw material were pulverized, mixed with a binder and auxiliary raw materials, and kneaded to obtain a kneaded product.
  • the kneaded product was molded, and the molded body was cured for a predetermined period to produce an unfired carbon-containing agglomerated mineral.
  • Carbon content of unfired carbon-containing agglomerated minerals C (total carbon) was 20 mass%.
  • the mixing ratio of the iron-containing raw material and the auxiliary raw material was adjusted so that the contents of CaO / SiO 2 and MgO became predetermined values.
  • the blending amount of the binder (cement) was 10% by mass. Specifically, the amount of gangue ((CaO + SiO 2 + Al 2 O 3 + MgO) / (100- carbon content (T.C.))) was fixed at 0.22, the MgO content of 0.9 wt% As a constant, the blending amount of Portland cement and finely divided silica was adjusted so that CaO / SiO 2 had a predetermined value in the range of 0.5 to 2.5.
  • Metal dripping rate (%) Drip metal amount / (Total amount of Fe charged ⁇ 0.95) ⁇ 100 Moreover, the metal dripping rate was similarly measured about only the sintered ore. In addition, when the metal dripping rate of sintered ore is less than 50%, the lower surface of the fusion band is lowered, and the lower dripping band region is narrowed. For this reason, lower air permeability deteriorates and stable operation becomes difficult. The obtained results are shown in Table 2 and FIG.
  • the CaO / SiO 2 of the unfired carbon-containing agglomerated mineral exceeds 2.0, it becomes difficult to maintain a metal dropping rate of 50%.
  • the indirect reduction proceeds from the low temperature region, so that the FeO content in the slag coexisting with the metal in the fusion layer is lowered, and the slag melting point is raised.
  • the iron melt produced by reduction includes coke carbon when descending to the lower part of the blast furnace, and the carbon content increases (reduction produced metal carburization).
  • FIG. 4 shows the measurement results representing the relationship between CaO / SiO 2 and metal dripping rate of sintered ore with an MgO content of 1.5%.
  • the metal dripping rate tends to decrease as CaO / SiO 2 increases. However, the change is gradual. Also from the result of FIG. 4, it can confirm that the component conditions which should be comprised in order to achieve the outstanding metal dripping property differ in a non-baking carbon-containing agglomerated ore and sintered ore.
  • CaO / SiO 2 needs to be 1.0 to 2.0 in order to improve the metal dropping rate.
  • CaO / SiO 2 is preferably 1.4 to 1.7, and a metal dropping rate of more than 60% can be achieved.
  • the melting point of the above-mentioned low FeO slag (slag with low FeO content) is lowered by MgO.
  • FIG. 5 also shows a measurement result representing the relationship between the MgO content of the sintered ore with a CaO / SiO 2 of 2.0 and the metal dripping rate (%). Also in the sintered ore, the metal dripping rate tends to increase as the MgO content increases. However, the change (influence) is larger than that of unfired carbon-containing agglomerated minerals. Also from the result of FIG. 5, it can confirm that the component conditions which should be comprised in order to achieve the outstanding metal dripping property differ in a non-baking carbon-containing agglomerated ore and sintered ore.
  • the amount of gangue is at this level (above 0.25)
  • the amount of hearth slag is significantly increased, and the tapping work becomes unstable. causess fluctuations in ventilation.
  • the metal dripping rate decreases as the carbon content (TC) increases. This is because the FeO concentration in the slag coexisting with the metal decreases as the carbon content (TC) increases as described above. As described above, in order to achieve stable operation in the blast furnace, the metal dripping rate needs to be 50% or more. It can be seen that when the CaO / SiO 2 is 1.0 to 2.0 and the carbon content (TC) is 25% by mass or less, a metal dropping rate of 50% or more can be achieved. Therefore, the upper limit of the carbon content (TC) needs to be 25% by mass.
  • the amount of the non-fired carbon-containing agglomerated mineral and the gangue is adjusted to a predetermined range. Rate) is not limited.
  • Various forms such as pellets and briquettes can be applied as long as they are non-fired carbon-containing agglomerated blast furnaces.
  • Various molding methods such as extrusion molding can be applied, and equivalent effects can be obtained.
  • the blast furnace In the blast furnace, the charge moves from the upper part to the lower part, and the reducing gas moves from the lower part to the upper part, thereby causing heat exchange and reaction to proceed. For this reason, the blast furnace is a countercurrent reactor. In general, in continuous operation of a blast furnace, the reducing power of the reducing gas is lost in the upper layer of the ore layer, and the reduction may not proceed sufficiently. In particular, the calcined agglomerated mineral does not contain carbon and does not have a self-reducing ability. For this reason, when a calcined agglomerated mineral is used, the calcined agglomerated mineral is not sufficiently reduced at the upper part of the ore layer.
  • the presence of the non-fired carbon-containing agglomerated mineral of the present embodiment together with the iron ore in the blast furnace can greatly improve the reduction efficiency particularly in the upper layer of the ore layer. Since the reduction efficiency in the upper layer of the ore layer that is difficult to be reduced can be greatly improved, the reduction efficiency in the entire blast furnace is greatly improved. For this reason, it is possible to reduce the amount of reducing material larger than the amount of coke equivalent to the excess amount of carbon in the unfired carbon-containing agglomerated mineral of this embodiment.
  • Fine iron-containing materials were prepared as iron-containing materials, and carbonaceous materials (coke dust, powder coke, and blast furnace primary ash) were prepared as carbon-containing materials.
  • cement early strong Portland cement
  • an auxiliary material having a high SiO 2 content was also used. The blending ratio of the raw material was adjusted so that the blending ratio of cement (early strong Portland cement) was 4 to 9% by mass, and the blending ratio of the carbonaceous material and the finely divided iron-containing raw material was various values. These raw materials were mixed with moisture and kneaded with an Eirich mixer.
  • the obtained kneaded product was granulated (molded) with a pan pelletizer to obtain raw pellets.
  • the raw pellets were subjected to sun curing for 2 weeks to produce unfired carbon-containing agglomerated minerals.
  • the water content of the raw pellets was adjusted to 10 to 14% by mass according to the amount of cement to be blended.
  • Example 1 the components were optimized, CaO / SiO 2 was 2.0, MgO was 0.6%, and the gangue amount was 0.22.
  • the air permeability at the bottom of the furnace was improved, and the reducing material ratio decreased to 470 kg / tp. For this reason, the effect using the non-baking carbon-containing agglomerated mineral with high carbon content was exhibited.
  • Example 2 it was blended with a high SiO 2 content adjuncts, was further reduced to 1.0 to CaO / SiO 2 enhances the SiO 2 content.
  • the CaO / SiO 2 and MgO contents were within the appropriate ranges, the slag melting point could be lowered.
  • the amount of gangue increased to 0.28, the metal dripping property was slightly lowered, and the reducing material ratio was not lowered so much.
  • Example 3 the binder amount was reduced to 4% in order to reduce the amount of gangue. However, since the chemical component content was appropriate, the metal dripping rate was improved. However, since the amount of the binder was small, the cold crushing strength was insufficient at 85 kg / cm 2 . For this reason, when it was used in a blast furnace, the amount of powder in the furnace increased, thereby lowering the upper air permeability, and the reducing material ratio was slightly higher.
  • Example 4 the content of the chemical component was adjusted by blending the auxiliary materials without reducing the binder amount. As a result, an unfired carbon-containing agglomerated mineral with good metal dripping properties could be produced without impairing the cold crushing strength. When used in a blast furnace, the reducing material ratio was the lowest.
  • Example 5 the CaO / SiO 2 and the gangue amount are within the ranges defined in the present embodiment (CaO / SiO 2 : 1.0 to 2.0, the gangue amount: 0.25 or less).
  • the MgO content was set as low as 0.4%. For this reason, the metal dripping rate remained at 52% and the reducing material ratio was reduced, but the effect of reducing the reducing material ratio was relatively small.
  • the carbon content (TC) is as low as 17% by mass, the CaO / SiO 2 is as low as 1.9, and the MgO content is as high as 1.0%. Agglomerate was produced. Since the carbon content (TC) was low, the slag melting point was sufficiently low, and there was no problem with dripping. However, when used in a blast furnace, since the carbon content is low, it has been difficult to reduce the reducing material ratio.
  • Comparative Example 3 a high carbon non-fired carbon-containing agglomerated mineral having a carbon content of 30% and exceeding the upper limit of 25% by mass within the range defined in the present embodiment was produced. Since the content of other components was within an appropriate range, the dropping rate was improved to 65%. However, the cold strength was as low as 60 kg / cm 2, and the minimum strength required for use in a blast furnace could not be obtained. For this reason, the amount of powder charged into the blast furnace increased, making long-term stable operation difficult.
  • the carbon content (TC) in the range of 18 to 25 mass% and CaO / SiO 2 in the range of 1.0 to 2.0 in the unfired carbon-containing agglomerated mineral. It turns out that dripping property is favorable and can reduce the reducing material ratio at the time of using in a blast furnace.
  • the amount of gangue (CaO + SiO 2 + Al 2 O 3 + MgO) / (100- carbon content (T.C.)) value of 0.25 or less, and when the MgO content is not less than 0.5 wt% This effect is remarkable.
  • the components as described above by adding auxiliary materials and setting the blending amount of the binder to 5 to 10%, the cold crushing strength can be maintained.
  • the non-fired carbon-containing agglomerated ore for blast furnace When used in a blast furnace, the non-fired carbon-containing agglomerated ore for blast furnace according to one embodiment of the present invention is not only covered with non-fired carbon-containing agglomerated ore, but also the main blast furnace iron-containing raw material such as sintered ore. It has a sufficient carbon content to improve the reduction rate. Furthermore, in the operation of the blast furnace, the slag melting point can be suppressed lower than before, and excellent reduction product slag characteristics (metal dripping properties) can be achieved.
  • the unfired carbon-containing agglomerated ore according to one aspect of the present invention is used as a part of the iron-containing raw material for blast furnace, good air permeability can be realized in the lower part of the furnace during blast furnace operation, and the reducing material ratio (coke Ratio) can be greatly reduced.
  • the method for producing a non-fired carbon-containing agglomerated mineral for a blast furnace since a non-fired process is applied, it is possible to save energy and reduce CO 2 compared to the fired process. Further, the dust generated in the iron making process can be recycled as an iron-containing raw material and a carbon material by a relatively inexpensive and simple method. Therefore, one embodiment of the present invention can be suitably applied to the technical field related to a carbon-containing agglomerated mineral used in a blast furnace.

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PCT/JP2010/063726 2009-08-21 2010-08-12 高炉用の非焼成含炭塊成鉱およびその製造方法 WO2011021577A1 (ja)

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BR112012003786-2A BR112012003786B1 (pt) 2009-08-21 2010-08-12 Aglomerado contendo carbono não queimado para altos fornos e seu processo de produção
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104651602A (zh) * 2015-01-12 2015-05-27 内蒙古包钢钢联股份有限公司 利用高硅粉矿制备烧结矿的方法
JP2015199978A (ja) * 2014-04-04 2015-11-12 新日鐵住金株式会社 還元鉄を用いた高炉操業方法
JP2016077965A (ja) * 2014-10-16 2016-05-16 新日鐵住金株式会社 フライアッシュのリサイクル方法及び非焼成塊成鉱
CN115404338A (zh) * 2022-09-13 2022-11-29 石横特钢集团有限公司 一种高硅高铝含铁料的烧结方法
WO2023199550A1 (ja) * 2022-04-11 2023-10-19 Ｊｆｅスチール株式会社 高炉の操業方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015005218A1 (ja) * 2013-07-11 2015-01-15 Ｊｆｅスチール株式会社 焼結用造粒原料の製造方法
KR20160071032A (ko) 2014-12-11 2016-06-21 주식회사 포스코 브리켓 및 브리켓 제조방법
CN108913181A (zh) * 2018-07-19 2018-11-30 武钢集团昆明钢铁股份有限公司 一种高钙焦及其生产方法
RU2735413C1 (ru) * 2020-05-19 2020-11-02 Михаил Николаевич Бушков Упрочняющая добавка для получения железорудного агломерата

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6250420A (ja) * 1985-08-28 1987-03-05 Nippon Steel Corp 非焼成塊成鉱
JP2002146444A (ja) * 2000-08-30 2002-05-22 Kobe Steel Ltd 製鉄原料の塊成化物製造方法
JP2008095177A (ja) * 2006-09-11 2008-04-24 Nippon Steel Corp 高炉用含炭非焼成ペレットの製造方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5113301A (ja) * 1974-07-24 1976-02-02 Nippon Steel Corp Hishoseikaiseikoseizohoho
JPS51147401A (en) * 1975-06-14 1976-12-17 Nippon Steel Corp A process for production of non-sintered agglomerated ores
JPS6029471B2 (ja) * 1979-08-16 1985-07-10 日機装株式会社 肝細胞の凍結方法
CN1358870A (zh) * 2001-10-10 2002-07-17 林原生 从常温到高温保持强度的含碳冷固结球团矿
JP4118604B2 (ja) * 2002-05-28 2008-07-16 株式会社 テツゲン 高炉用のカーボン内装非焼成塊成鉱およびその製造方法
JP4167101B2 (ja) * 2003-03-20 2008-10-15 株式会社神戸製鋼所 粒状金属鉄の製法
RU2241760C1 (ru) * 2003-07-03 2004-12-10 Открытое акционерное общество "Новолипецкий металлургический комбинат" Брикет-компонент доменной шихты
US7896963B2 (en) * 2003-09-23 2011-03-01 Hanqing Liu Self-reducing, cold-bonded pellets
JP5114742B2 (ja) * 2007-12-28 2013-01-09 新日鐵住金株式会社 高炉用含炭非焼成ペレットの製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6250420A (ja) * 1985-08-28 1987-03-05 Nippon Steel Corp 非焼成塊成鉱
JP2002146444A (ja) * 2000-08-30 2002-05-22 Kobe Steel Ltd 製鉄原料の塊成化物製造方法
JP2008095177A (ja) * 2006-09-11 2008-04-24 Nippon Steel Corp 高炉用含炭非焼成ペレットの製造方法

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015199978A (ja) * 2014-04-04 2015-11-12 新日鐵住金株式会社 還元鉄を用いた高炉操業方法
JP2016077965A (ja) * 2014-10-16 2016-05-16 新日鐵住金株式会社 フライアッシュのリサイクル方法及び非焼成塊成鉱
CN104651602A (zh) * 2015-01-12 2015-05-27 内蒙古包钢钢联股份有限公司 利用高硅粉矿制备烧结矿的方法
WO2023199550A1 (ja) * 2022-04-11 2023-10-19 Ｊｆｅスチール株式会社 高炉の操業方法
JPWO2023199550A1 (enrdf_load_stackoverflow) * 2022-04-11 2023-10-19
JP7552881B2 (ja) 2022-04-11 2024-09-18 Ｊｆｅスチール株式会社 高炉の操業方法
CN115404338A (zh) * 2022-09-13 2022-11-29 石横特钢集团有限公司 一种高硅高铝含铁料的烧结方法

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CN102482730B (zh) 2014-07-02
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