Classifications

• • 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
  • C22B1/16—Sintering; Agglomerating
• • 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
  • 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
  • C22B1/16—Sintering; Agglomerating
  • C22B1/20—Sintering; Agglomerating in sintering machines with movable grates
• • 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 sintering pseudo-particle material used for producing sinter for a blast furnace using a Dwight toroid type sintering machine with downward suction, and a method for producing the same.
• Sinters used as raw materials for blast furnaces are generally produced through the following methods for processing raw materials. As shown in FIG. 1 6, first, a particle size of 10mm or less of iron ore, grain size 10mm following silica, serpentinite or you containing Si0 2 containing a raw material, powdery CaO made of nickel slag limestone Using a drum mixer, add a suitable amount of moisture to a raw material powder and powdered coke or a solid fuel powder raw material, such as anthracite, which is a heat source, mix, granulate, and form granules called pseudo particles. Form an object.
• a solid fuel powder raw material such as anthracite
• the compounded raw material composed of the granulated material is charged on a pallet of a Dwight toroid type sintering machine so as to have an appropriate thickness of 500 to 700 mm and ignites the solid fuel on the surface layer. Burns the solid fuel while sucking air downward, and sinters the blended sintering raw materials by the heat of combustion to form a sintered cake. This sintered cake is crushed and sized to obtain sinter with a certain particle size or more, while those with a smaller particle size are returned to ore and reused as raw material for sintering.
• the reducibility of the product sinter produced in this way is a factor that greatly affects the operation of the blast furnace, as pointed out in the past.
• the reducibility of sinter is defined by JIS M8713 (JIS: Japanese Industria 1 Standard, hereinafter referred to as JIS), and here, the reducibility of sinter is described as JIS-RI.
• JIS-RI the reducibility of sinter
• the gas utilization in the blast furnace 77 c .
• the reducibility of sinter sinter
• Fuel ratio (Coal + Coat consumption (kg / s)) / Pig iron production
• the cold strength of the manufactured product sinter is also an important factor in maintaining the permeability in the blast furnace, and each blast furnace has a lower limit of cold strength. Therefore, it can be said that the sinters that are desirable for the blast furnace are those that have excellent reducibility and high cold strength.
• calcium Blow wells is tissue (CF): nCaO ⁇ Fe 2 0 3, to Matthew Doo (He): Fe 2 0 3 , calcium you containing FeO silicate (CS): CaO ⁇ xFeO - y Si0 2, Magunetai Preparative (Mg): Fe 3 0 4 4 one of reducible to show the tensile strength.
• hematite (He) is highly reducible
• calcium ferrite (CF) is highly tensile.
• the tensile strength was determined by preparing a disc-shaped ore test specimen and measuring it according to the method specified by the tensile test method (r dial compression test or Brazilian test).
• a desirable sintered structure intended by the present inventor is that high-strength calcium ferrite (CF) is applied to the surface of the lump, and the shape of the ferrite is reduced toward the inside of the lump.
• Calcium silicate (CS) containing FeO which is a substance that selectively generates gallium (He) and has low reducibility and low strength, should be avoided as much as possible.
• the sintering machine most cases, the aforementioned good urchin, iron ore, Si0 2 containing material, limestone-based powder material, because it simultaneously mixed solid fuel-based powder material, in FIG. 6
• the pseudo-particle structure fine ore, lime, and coats are mixed around the coarse-grained core ore.
• hematite (He) and calcium ferrite are used.
• CF FeO-containing calcium silicate (CS)
• Mg magnetite
• Japanese Patent Application Laid-Open No. 63-149331 discloses a method of granulating powdery iron ore by adding pinda limestone. After that, the surface is coated with coke breeze, which is a heat source, to improve the combustibility of the coater, and sintering at a lower temperature to improve the reducibility. Improved techniques have been proposed.
• the present invention for solving the above conventional problems, without requiring a huge facilities as pretreatment of a process for producing a sintered ore, iron ore and Si0 2 containing the raw material, limestone-based powder material and a solid fuel system
• high-strength calcium ferrite (CF) is applied to the lump surface
• highly reducible hematite (He Pseudo-particle raw material for sintering which can produce a sintered ore having a structure in which sinter is selectively produced, improve the cold strength, and improve the reducibility of the sinter, and a method for producing the same. It is intended to provide. Disclosure of the invention
• a first invention for achieving the above object is a first layer comprising a coarse iron ore having an average particle diameter of 2 mm or more as a nucleus, as a sintering pseudo-particle material for producing a sinter for a blast furnace.
• the first layer having an average particle diameter that does not contain limestone-based powder material and a solid fuel based flour raw material so as to cover the outer surface of less than 2 mm of fine iron ore Contact Yopi, Si0 2 containing feedstock Limestone powder raw material and solid fuel as the third and subsequent layers.
• a sintering pseudo-particle material characterized by having a base powder material attached thereto.
• a second invention is the sintering pseudo-particle material according to the first invention, wherein the third layer is a mixed layer of a limestone-based powder material and a solid fuel-based powder material.
• a third invention is characterized in that, in the first invention, the third layer is a limestone-based powder material layer, and an outer layer portion of the limestone-based powder material layer is provided with an adhesion layer of the solid fuel-based powder material. Is a sintering pseudo-particle material.
• the fourth invention as a pre-process of the process for producing the blast furnace sinter using Dowai toroid type sintering machine of downward suction, iron ore, Si 0 2 containing the raw material, limestone-based powder material and a solid
• the average particle size is based on coarse iron ore with an average particle size of 2 mm or more, with limestone-based powder raw materials and solid fuel-based powder raw materials around it.
• a method for producing a pseudo-particle material for sintering characterized in that a solid fuel-based powder material to be deposited is attached and granulated to form three or more layers of pseudo particles having a coating.
• the mixed powder of the limestone-based powder material and the solid fuel-based powder material is adhered to the third layer and granulated to form three-layer coated pseudo-particles. This is a method for producing a quasi-particle material for sintering.
• an outer layer of the limestone-based powder raw material layer is further formed.
• a method for producing a quasi-particle raw material for sintering characterized in that a solid fuel-based powder raw material is adhered to a part and granulated to form four-layer coated pseudo particles.
• seventh aspect of the invention of a 4-6 wherein the coarse iron ore and the fine particle of iron ore Contact Yopi, were charged to a granulator provided with a Si0 2 containing feedstock separately
• the granulator is used to form a coarse iron ore as a nucleus, and a fine sintering raw material is adhered around the nucleus for granulation, and then the limestone powder raw material and the solid fuel powder raw material serving as a heat source are mixed with a mixer.
• a method for producing a quasi-particle raw material for sintering wherein the raw material is charged and granulated.
• eighth aspect of the invention of a 4-6 was charged the coarse iron ore and the fine particle of iron ore your Yopi, and a Si0 2 containing feedstock at the tip of the mixer mono-, wherein the coarse iron ore as nuclei, the iron ore Contact Yopi of the granules around its periphery, while granulated by adhering Si0 2 containing the raw material, the limestone-based powder material and the heat source from the rear end of the mixer
• ninth aspect of the invention of a 4-6 wherein the fine particle of iron ore and iron ore of the coarse particles, and charged with Si0 2 containing feedstock from multiple mixer-edge side mixer wherein the coarse iron ore as a nucleus, iron ore Contact Yopi of the granules around its periphery, Si0 2 containing raw material to adhere with granulation plurality of mixers one end of the mixer one tip or rear end
• a method for producing a quasi-particle material for sintering comprising charging a limestone-based powder raw material and a solid fuel-based powder raw material serving as a heat source from a part and granulating.
• Figure 1 Flow chart of mixing and granulating sintering raw materials according to the present invention
• FIG. 2 is a flow chart (method B) of mixing and granulating other sintering raw materials according to the example of the present invention.
• FIG. 3 is a flowchart (method C) of mixing and granulating other sintering raw materials according to the example of the present invention.
• FIG. 4 Comparison of sinter ore reducibility JIS-RI (%), production rate (t / hr ⁇ m 2 ), and shutter strength (%) when sintering raw material is processed by the method of the present invention and the conventional method FIG.
• FIG. 5 is a schematic diagram showing a desirable sintered ore structure in the present invention.
• FIG. 6 is a schematic diagram showing a pseudo-particle structure and a sintered ore structure according to a conventional example.
• FIG. 7 is a schematic view showing a desirable pseudo particle structure in the present invention.
• . . 6 is a graph showing the relationship with (%).
• Gas utilization rate c in the blast furnace. 6 is a graph showing the relationship between (%) and the fuel ratio (kg / t-pig).
• FIG. 10 is a photograph showing the structure of pseudo particles treated by the method of the present invention and the conventional method.
• Fig. 11 is a photograph showing a distribution of Ca and Fe measured by a cross-section of a pseudo particle treated by the method of the present invention using an electron beam microphone analyzer.
• Fig. 12 is a photograph showing Ca and Fe distributions measured by an electron beam microphone analyzer of cross sections of sintered bodies of pseudo particles according to the method of the present invention and the conventional method.
• Fig. 13 is a photograph showing the appearance of a sintered body of pseudo particles obtained by the method of the present invention and the conventional method.
• FIG. 14 is a graph showing a comparison between a pore diameter ( ⁇ ) and a pore volume (ccZg) of sintered bodies obtained by sintering pseudo particles according to the method of the present invention and the conventional method.
• FIG. 16 is a flow chart for performing mixing and granulating processes of a sintering raw material according to a conventional example.
• Figure 17 is a diagram showing the method of measuring the depth of fusion.
• Fig. 18 is a diagram showing the relationship between the melting depth and the reaction time when ordinary iron ore with a porosity of 15% is used.
• Figure 19 shows the relationship between the melting depth and the reaction time when using iron ore with a porosity of 35%.
• FIG. 20 is a diagram showing the relationship between the content of the pseudo-particle raw material for sintering of the present invention and the reducibility of the sinter.
• the present inventors have, as a result of various investigations, as shown in FIG. 7 separation, the iron ore and Si0 2 containing a raw material containing a large amount of Si 0 2, from limestone-based powder material and the solid body fuel based flour ingredients
• the production of pseudo-particles delays the reaction between CaO and SiO 2 and suppresses the formation of FeO-containing calcium silicate (CS), which has poor reducibility and low cold strength.
• the calcium ferrite (CF) melt generated at the interface between the limestone powder raw material and the iron ore had a low viscosity, and the surroundings of the iron ore were instantaneous. It has sufficient cold strength to cover it.
• a sintering pseudo-particle material for producing a blast furnace sintered ore that satisfies the above conditions there is a first layer in which coarse iron ore with an average particle size of 2 mm or more is used as a core ore. by having the second layer flat Hitoshitsubu diameter excluding the limestone-based powder material and a solid fuel based flour material was deposited a sintering material based flour raw material fines of less than 2 mm, a reaction of CaO and Si0 2 It retards the production of calcium silicate (CS) containing FeO, which has poor reducibility and low cold strength.
• CS calcium silicate
• a pseudo-particle material for sintering in a state in which iron ore or a SiO 2 -containing raw material is separated from a limestone-based powder raw material and has no limestone.
• the limestone-based powder material layer which is the third layer covering the outer surface of the second layer, generates a calcium ferrite (CF) -based melt at the interface between the limestone-based powder material and the iron ore. By covering It exerts sufficient cold strength.
• the sintering pseudo-particle material selectively generates high-strength calcium ferrite (CF) on the lump surface and highly reducible hematite (He) toward the lump interior. Sinter is formed.
• the limestone-based powder material layer serving as the third layer may be a limestone-based powder material layer alone or a mixed layer of a limestone-based powder material and a solid fuel-based powder material. This is because the limestone content in the third layer enables the formation of strong calcium ferrite (CF) on the lump surface. If the third layer is only a limestone-based powder material layer, a solid fuel-based powder material layer is required as the fourth layer.
• the average particle diameter used in the present invention is obtained by calculating the projected area circle equivalent diameter (Heywood diameter) of each particle by an image analysis method by microscopic observation and arithmetically averaging it.
• a feature of the present invention is to increase the amount of unmelted iron ore (remaining ore) that does not react with limestone by having first and second layers that do not include limestone-based powder material and solid fuel-based powder material. It is in.
• the inventors have found, as in FIG. 1 7, iron ore tough ', on Rett (Tablet Fe 2 0 3), placing the tough ⁇ Tato (Tablet CaO) limestone (CaO), Jo Tokoro temperature After the reaction, the length (melting depth) of the molten iron ore tuft was measured.
• D Ca diffusion coefficient (cm 2 / s)
• Figure 18 shows the relationship between the depth of melting and the reaction time using iron ore with a porosity of 15%, which is ordinary iron ore.
• the average particle size of iron ore is at least 2 mm when considered under the condition that the heating condition of the assumed sintering process is maintained at 1250 ° C for about 360 seconds. From the above, it can be seen that under the maximum temperature condition of 1300 ° C., the unmelted portion of the iron ore does not remain unless it is preferably 3 mm or more.
• the average particle size of the coarse iron ore serving as a nucleus is 2 mm or more.
• a second layer is formed in the outer layer of the core ore to increase the grain size, and the first and second layers secure the amount of unmelted iron ore (remaining ore).
• CS calcium silicate
• Figure 19 shows the relationship between the depth of melting and the reaction time using iron ore with a porosity of 35%, which is a highly crystalline water ore.
• the present invention can be implemented by setting the iron ore particle diameter to an average particle diameter of 4 mm or more.
• the second layer is formed by sintering raw material powder excluding limestone powder raw material and solid fuel powder raw material with fine grains of less than 2 mm in average particle size smaller than core ore.
• FIG. 1 shows an example of a granulation flow (method A) for producing a desirable pseudo-particle structure of the present invention.
• Method A for producing a desirable pseudo-particle structure of the present invention.
• Method A starting for example Si0 2 and 0.5 to 5.
• Iron ore 1 grit is an average particle diameter contains about 0 percent more than 2 mm, from 0.5 to 5 and Si0 2. 0% about content and average particle size of less than 2 mm, for example 0. 1 ⁇ : 1.
• Si0 2 containing feedstock 2 fine grain is about 0 mm (iron ore, silica stone, serpentine, Ni slag, etc.) and by a separate granulator 6, the iron ore 1 of coarse depositing a Si0 2 containing feedstock 2 of granules around its periphery as a nucleus for the preliminary granulation. Then, the limestone-based powder material 3 or the limestone-based powder material 3 and the solid fuel-based powder material 4 (coke, anthracite, etc.) serving as a heat source are further added, and mixed and granulated by the drum mixer 5.
• FIG. 2 shows an example of a granulation flow (method B) for producing another desirable pseudo-particle structure of the present invention.
• Method B a granulation flow
• the limestone-based powder material 3 or the limestone-based powder material 3 and the solid fuel-based powder material 4 (coke, anthracite, etc.) are added from the rear end of the drum mixer 5 while forming pseudo particles.
• FIG. 3 shows another example of a granulation flow (method C) for producing another desirable pseudo-particle structure of the present invention.
• the Dorami mixer has a plurality of configurations (two sets in this example), and the coarse iron ore 1 and the fine iron ore and Pi Si0 2 containing feedstock 2 (a fine silica, serpentinite, Ni slag, etc.) and while forming a pseudo-particles were added from the distal end of the distal end side of the drum mixer 5 and the outermost tail side drum mixer 5 '
• the limestone-based powder raw material 3 or the limestone-based powdered raw material 3 and the solid fuel-based powdered raw material 4 are added and mixed from the front end indicated by the broken line or from the rear end indicated by the solid line. Granulate.
• the solid fuel-based powdered raw material 4 (cokes, anthracite, etc.) is then added and mixed to granulate the fourth layer.
• the limestone-based powder raw material 3 and the solid fuel-based powder raw material 4 have an average particle size of 0.5 mm or less, preferably 0.25 mm or less, so that they can easily adhere to the second layer, and cover the outer surface. I can.
• the present inventors conducted a sinter ore production experiment when the content ratio of the pseudo-particle material for sintering of the present invention in the entire sintering material was changed. The reducibility of the sintered ore obtained in the experiment was measured. Figure shows an example of the results
• the sintering pseudo-particle material of the present invention accounts for 20% or more of the entire sintering material, it has the effect of improving the reducibility of the conventional sinter.
• the content of the pseudo-particle material for sintering according to the present invention in all the sintering materials is preferably secured at 50% or more to produce the sintered ore.
• the content ratio of the sintering pseudo-particle material according to the present invention can be adjusted as follows.
• the sintering pseudo-particle raw material of the present invention which is separately manufactured, is added to a sintering raw material by a conventional granulation method so as to have a necessary content ratio.
• the required content can be adjusted by adjusting the timing of adding the limestone raw material.
• the content ratio of the quasi-particle material for sintering of the present invention is reduced.
• the content ratio of the simulated particle material can be increased.
• pseudo particles granulated by (method A) shown in FIG. 1 of the present invention were transported to a Dwight toroid sintering machine and charged on a pallet.
• Iron ore for comparison, transported Si0 2 containing the raw material, limestone-based powder material, a granulated pseudo particles in the processing method of mixing coke powder simultaneously to Dowai toroid sintering machine, charged on Paretsu preparative operations was done.
• Table 3 shows the results of the method of the present invention and the conventional method.
• pseudo particles produced by using (method B) shown in FIG. 2 of the present invention were similarly transported to a Dwight toroid sintering machine and charged on a pallet. After that, sintering is performed, and the production rate, shutter strength (cold strength, JIS
• the pore size distribution was determined by a mercury porosimeter using a mercury porosimeter.
• the sintered ore produced by the method of the present invention has a fine pore portion of 1 m or less serving as a flow path of the reduced gas, and has a pore structure suitable for improving the reducibility.
• the pseudo particles according to the method of the present invention have a limestone exterior. Therefore, the surface became more red and white than the conventional method.
• the results of investigating the distribution of Ca and Fe using an electron beam microanalyzer (EPMA) on the cross section of the simulated particles are shown. It is shown in Figure 11. As a result, it was confirmed that the pseudo particles obtained by the method of the present invention had limestone coated reliably on the surface.
• EPMA electron beam microanalyzer
• FIG. 12 shows the results of measuring the cross section of the sintered body of the pseudo-particles according to the method of the present invention and the conventional method by EPMA-.
• high-strength calcium ferrite (CF) is applied to the lump surface as shown in FIG. 5 and highly reducible hematite (He) toward the inside of the lump.
• He highly reducible hematite
• Hematite (He) which is highly reducible toward the inside of the lump, is selectively generated into the mass (CF), and sinter with high microporosity, high reducibility and high cold strength is produced. Can be manufactured with high productivity.

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• 2001
  • 2001-05-18 JP JP2002500779A patent/JP3656632B2/ja not_active Expired - Fee Related
  • 2001-05-18 KR KR1020027001021A patent/KR100569518B1/ko active IP Right Grant
  • 2001-05-18 CN CNB018021301A patent/CN1198948C/zh not_active Expired - Lifetime
  • 2001-05-18 BR BRPI0106705-2A patent/BR0106705B1/pt not_active IP Right Cessation
  • 2001-05-18 WO PCT/JP2001/004163 patent/WO2001092588A1/ja active IP Right Grant
  • 2001-05-24 TW TW90112510A patent/TW574374B/zh not_active IP Right Cessation

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