CN102159733B - Sintered ore manufacturing method - Google Patents
Sintered ore manufacturing method Download PDFInfo
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- CN102159733B CN102159733B CN2009801361127A CN200980136112A CN102159733B CN 102159733 B CN102159733 B CN 102159733B CN 2009801361127 A CN2009801361127 A CN 2009801361127A CN 200980136112 A CN200980136112 A CN 200980136112A CN 102159733 B CN102159733 B CN 102159733B
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- liquation
- iron ore
- iron
- agglomerate
- sintering
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 35
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 422
- 229910052742 iron Inorganic materials 0.000 claims abstract description 206
- 238000005245 sintering Methods 0.000 claims abstract description 118
- 239000000463 material Substances 0.000 claims abstract description 75
- 239000004449 solid propellant Substances 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims description 147
- 238000012856 packing Methods 0.000 claims description 135
- 230000035515 penetration Effects 0.000 claims description 80
- 238000000034 method Methods 0.000 claims description 44
- 238000002156 mixing Methods 0.000 claims description 25
- 238000005469 granulation Methods 0.000 claims description 20
- 230000003179 granulation Effects 0.000 claims description 20
- 238000003723 Smelting Methods 0.000 claims description 12
- 230000035699 permeability Effects 0.000 abstract description 19
- 239000007858 starting material Substances 0.000 abstract 6
- 239000000155 melt Substances 0.000 abstract 2
- 238000012360 testing method Methods 0.000 description 46
- 239000002245 particle Substances 0.000 description 39
- 238000006243 chemical reaction Methods 0.000 description 23
- 239000000203 mixture Substances 0.000 description 22
- 238000011156 evaluation Methods 0.000 description 18
- 230000009467 reduction Effects 0.000 description 18
- 239000000571 coke Substances 0.000 description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- 238000004088 simulation Methods 0.000 description 14
- 239000013078 crystal Substances 0.000 description 11
- 238000010304 firing Methods 0.000 description 11
- 229910052500 inorganic mineral Inorganic materials 0.000 description 11
- 239000011707 mineral Substances 0.000 description 11
- 239000000843 powder Substances 0.000 description 10
- 230000015556 catabolic process Effects 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 9
- 238000006731 degradation reaction Methods 0.000 description 9
- 230000003139 buffering effect Effects 0.000 description 8
- 239000003595 mist Substances 0.000 description 8
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 6
- 230000001195 anabolic effect Effects 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910052595 hematite Inorganic materials 0.000 description 4
- 239000011019 hematite Substances 0.000 description 4
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 238000004939 coking Methods 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 230000005307 ferromagnetism Effects 0.000 description 3
- 230000008595 infiltration Effects 0.000 description 3
- 238000001764 infiltration Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002367 phosphate rock Substances 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 3
- 208000037656 Respiratory Sounds Diseases 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- PMVSDNDAUGGCCE-TYYBGVCCSA-L Ferrous fumarate Chemical compound [Fe+2].[O-]C(=O)\C=C\C([O-])=O PMVSDNDAUGGCCE-TYYBGVCCSA-L 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000013142 basic testing Methods 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000001149 thermolysis Methods 0.000 description 1
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Classifications
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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
- C22B1/16—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
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
-
- 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
- C22B1/2413—Binding; Briquetting ; Granulating enduration of pellets
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
Disclosed is a sintered ore manufacturing method, in which a chalybeate starting material that contains multiple brands of iron ore, auxiliary materials, solid fuel, and return ore are blended as a sintering starting material, these sintering starting materials are blended and pelletized, and then charged into a sintering pallet and sintered. Iron ores of high melt permeability, that are selected from the multiple brands or blended so that weighted average of the melt permeability distance is 4.0 mm or greater based on the melt permeability distance measured for each of the brands of the iron ore, are charged to the upper layer, in which the layer thickness proportion is in the range of 5-12% relative to the total layer thickness from the top surface of the starting material fill layer formed on the sintering pallet, and the other iron ores are charged to the lower layer of the starting material fill layer, and auxiliary materials, the solid fuel, and the return ore are charged to the upper layer and the lower layer of the starting material fill layer.
Description
Technical field
The present invention relates to the manufacture method of the agglomerate that uses as iron-smelting raw material, particularly relate to the manufacture method that is formed at the agglomerate of the yield rate on the raw material packing layer top in pallet and intensity for improvement.
No. 2008-238448, the Patent that the application filed an application in Japan based on September 17th, 2008 is also advocated its right of priority, quotes its content here.
Background technology
In recent years, be in the iron ore of Australia product at the main iron ore that Japan uses, the exhaustion of the hematite ore of high-quality is in development, now, and in the exploitation of carrying out peastone (pisolite) mineral deposit and Marra Mamba mineral deposit and high phosphorus Brockman mineral deposit.
From Marra Mamba mineral deposit or the iron ore of high phosphorus Brockman mineral deposit output and the hematite ore of high-quality to compare granularity little, and the content of crystal water is high.Therefore, when sintering, these iron ores become the reason of air permeability reduction or sintering reaction deterioration.
High crystal water ore from the existing peastone ore of peastone mineral deposit output.That crystal water content is the iron ore more than 4 quality % at 9 one-tenth from the iron ore of this peastone mineral deposit, Marra Mamba mineral deposit and high phosphorus Brockman mineral deposit output.
Below, the impact on sintering operation in the situation that is combined with in a large number high crystal water ore as raw materials for sintering is described.
Usually, adopt the manufacturing of the agglomerate of below attraction type sinter machine to be carried out as follows.
It is the auxiliary materials such as the required Wingdale of the iron-bearing materials such as ironmaking dust, the sintering reaction that produce in iron ore or Iron-smelting and serpentinite that raw materials for sintering contains main raw material, as the solid fuels such as coke powder of thermal source, use by coordinating these raw materials.
Raw materials for sintering below packing in attraction type sinter machine before, adopt the mixing granulation machines such as round tube type mixing machine, water mixes, granulation while add, and is processed into simulation particle.This simulation particle is mainly the nuclear particle more than 1mm and to be attached to particle diameter around it be that the powder that adheres to below 0.5mm consists of by particle diameter.
Be processed into the raw materials for sintering of this simulation particle by packing in sinter machine, can keep the air permeability in the sintering packing layer that is formed in pallet, the sintering reaction of acceleration of sintering raw material is guaranteed high productivity.
The raw materials for sintering that is processed into this simulation particle is loaded in pallet from the ore deposit section that gives of sinter machine, forms the raw material packing layer.Then, light the coke powder on raw material packing layer surface with ignition furnace, by from sinter machine bottom attraction air, the point of ignition of coke powder is moved to the below of raw material packing layer.
Utilize the combustion heat of this coke powder in turn to carry out sintering reaction from the upper strata of raw material packing layer to lower floor, finish sintering by mobile pallet until arrive ore discharge section.Sinter cake (piece) in pallet is being pulverized after ore discharge section discharges, and makes thus the agglomerate that the blast furnace of designated size is used.
The sintering breeze that the ratio designated size that produces in the manufacturing of agglomerate is little can not be used as the agglomerate that blast furnace is used, and therefore is engaged in raw materials for sintering as returning mine, and carries out sintering again.
The sintering reaction of raw materials for sintering is near 1200 ℃, mainly undertaken by the generation of following initial stage liquation and anabolic reaction thereafter.That is to say, by the Fe in iron-bearing material
2O
3With the reaction of CaO in Wingdale, generate ferro-calcium elements body (CaO-Fe
2O
3) the initial stage liquation.Then, the composition fuse into iron ore in this initial stage liquation in and the anabolic reaction of the composition in auxiliary material.
This sintering reaction is the very fast reaction of generation to finish about several minutes from the initial stage liquation.By this reaction, the quality such as intensity of the yield rate of agglomerate and productivity and agglomerate are greatly affected.
For example, if sintering reaction carries out superfluously, the liquation amount of generation extremely increases, and in sintering operation, the air permeability in sintered layer worsens.Because the sintering inequality occurs for the deterioration of this air permeability, so yield rate and productivity reduces, and the sinter qualities such as intensity also worsen.
On the other hand, carry out when insufficient at sintering reaction, be used for making the liquation of the mutual combination of not fusing department of residual iron ore (residual raw ore) etc. to reduce, so yield rate reduces, the quality deteriorated of the agglomerate such as intensity or reduction degradation (RDI).
This sintering reaction has considerable influence to the granulation of the air permeability of the coking property (same voltinism) that coordinates the main raw material in raw material, the mineral composition that accounts for the iron ores more than overall 6 one-tenths or proterties etc. and cause and left and right raw materials for sintering packing layer.
As iron ore, in the situation that coordinate the contour crystal water iron ore of peastone ore, near the crystal water that is derived from the pyrrhosiderite tissue in iron ore thermolysis 300 ℃, dehydration, at this moment, pyrrhosiderite tissue generation crackle.
Therefore, generate in liquation in the early stage pore or the state with the residual pore that has generated of generating solidify and obtain in conjunction with phase or the remaining not melting raw ore that comprises crackle.Consequently, agglomerate becomes the tissue of fragility and Porous, and the yield rate of agglomerate is reduced, and the sinter qualities such as intensity worsen.
In addition, as raw materials for sintering, the content of the crystal water such as Marra Mamba ore or high Rock Phosphate (72Min BPL) is high, the iron ore of fine size in the situation that coordinate, and except the problem that above-mentioned crystal water causes, granulation also worsens.Therefore, be difficult to generate simulation particle, simulation particle when transmitting or raw material easily break when packing into.
Therefore, in the time of in chassis that raw material is packed into, there is no the micro mist iron ore of granulation or break after the Preparation of Fine Powders of the iron ore that generates distribute in the upper layer side segregation of raw material packing layer, so the air permeability of upper layer part reduces.In addition, the pyrrhosiderite tissue that contains crystal water is present in the iron ore particle of fine size because of fragile more.
The Preparation of Fine Powders of the iron ore that therefore, distributes in the upper layer side segregation of raw material packing layer also becomes and causes and result from the reason of above-mentioned crystallization water problem.
Usually, below adopting in the manufacturing of the agglomerate of attraction type sinter machine, the attraction by near the air of room temperature reduces the temperature of the surface element of the raw material packing layer after catching fire.Therefore, the quality deteriorated of the reduction of the yield rate of the agglomerate of upper layer part and intensity etc. was from just became problem in the past.
The quality problems such as the yield rate of the agglomerate of this upper layer part and intensity are significant in the sintering operation in recent years that coordinates high crystal water iron ore and particulate iron ore as raw materials for sintering.
Adopt above-mentioned below in the manufacturing of agglomerate of attraction type sinter machine, the method as quality such as the yield rate of the upper layer part that improves the raw materials for sintering packing layer and intensity had proposed several different methods in the past.
For example, proposed to increase the solid-fuelled method (for example, with reference to patent documentation 1) of the upper layer part of raw material packing layer.
In addition, also proposed by utilizing the charging apparatus of magnetic, the granules of returning mine, roll iron scale, magnetite contour FeO ferromagnetism raw material and ferromagnetism raw material and carbon material is encased in the method (for example, with reference to patent documentation 2～6) of the skin section of raw material packing layer.
In addition, consider the assimilation meltbility of the iron ore that is engaged in raw materials for sintering, also proposed the easy meltbility iron ore of packing on the upper strata of raw material packing layer, in pack into the method (for example, with reference to patent documentation 7) of difficult meltbility iron ore of its lower layer part.
That is to say, for the temperature of the skin section that makes the raw material packing layer after catching fire rises, increase the solid fuel of the skin section of raw material packing layer, or pack in the skin section of raw material packing layer the ferromagnetism raw material that contains more FeO or easy meltbility iron ore etc., described FeO is easily and CaO or SiO in auxiliary material
2Generate liquation (CaO-SiO
2-FeO).The purpose of these methods is to improve the quality such as the yield rate of agglomerate of raw material packing layer upper layer part and intensity.
Yet, according to aforesaid method, be difficult to moderately to control heat and the liquation growing amount on the upper strata of raw material packing layer, therefore, heat is too high, or liquation exceedingly increases.Therefore, the problem that exists the quality of the agglomerate such as air permeability deterioration, productivity reduction, being reduced property of raw material packing layer integral body to reduce.
The prior art document
Patent documentation
Patent documentation 1: TOHKEMY 2000-144266 communique
Patent documentation 2: TOHKEMY 2000-328148 communique
Patent documentation 3: TOHKEMY 2001-234257 communique
Patent documentation 4: TOHKEMY 2001-271122 communique
Patent documentation 5: TOHKEMY 2001-335849 communique
Patent documentation 6: TOHKEMY 2002-130957 communique
Patent documentation 7: Japanese Patent Publication 60-47887 communique
Summary of the invention
Invent problem to be solved
problem points in view of above-mentioned prior art, the object of the present invention is to provide a kind of manufacture method of agglomerate, below adopting in the manufacture method of the agglomerate of attraction type sinter machine, by packing into selectively in the upper strata of raw material packing layer to the iron ore of the kind of the liquation superior permeability of micro mist section, the liquation that prevents the upper strata of raw material packing layer excessively increases, can worsen in the air permeability that does not make raw material packing layer integral body, do not make in the situation that the sinter quality such as being reduced property reduces, improve yield rate and the intensity on the upper strata of raw material packing layer, improve the productivity of agglomerate.
The means of dealing with problems and adopting
The inventor etc. are to having carried out research with keen determination for the yield rate on the upper strata of improving the raw material packing layer in the manufacturing of agglomerate is formed at pallet and the method for intensity.
Consequently, confirm: in the iron ore of the many kinds that consist of raw materials for sintering, yield rate and the intensity of agglomerate on the upper strata of raw material packing layer can be improved in the upper strata of the specialized range of the raw material packing layer that the liquation penetration distance of measuring by the liquation perviousness evaluation test that will utilize in iron ore powder is formed on pallet for the iron ore more than 4.0mm is encased in selectively.
In addition, according to this method, learn with the solid fuel on the upper strata that makes the raw material packing layer of proposition or the method for FeO source increase or the method for the easy meltbility iron ore of packing on the upper strata of raw material packing layer were compared in the past, can be in the situation that do not make the upper strata of raw material packing layer generate excessive liquation, the air permeability of raw material packing layer integral body reduced, improve yield rate and the intensity of agglomerate on the upper strata of raw material packing layer.
The present invention is based on above-mentioned experience and completes, and therefore main idea of the present invention is as follows.
(1) a kind of manufacture method of agglomerate, it is by comprising the iron-bearing material of many kinds iron ore, auxiliary material, solid fuel and returning mine coordinates and as raw materials for sintering, these raw materials for sintering are mixed, after granulation, be encased in the manufacture method of the agglomerate that burns till on pallet, the liquation penetration distance by described each kind mensuration based on described iron ore, will be from the described iron ore of described many kinds reaching mode more than 4.0mm with the weighted mean of described liquation penetration distance selects or coordinates and the high liquation perviousness iron ore that obtains is encased in the upper strata, described upper strata is formed at the upper surface of the raw material packing layer on described pallet to count 5～12% scope with respect to the bed thickness ratio of total bed thickness for distance, other iron ore is encased in the lower floor of described raw material packing layer, and, with described auxiliary material, described solid fuel and described described upper strata and the described lower floor of returning mine and being encased in described raw material packing layer.
(2) in the manufacture method according to above-mentioned (1) described agglomerate, the Al of described high liquation perviousness iron ore
2O
3Content also can be for below 0.6 quality %.
(3) in the manufacture method according to above-mentioned (1) described agglomerate, except described high liquation perviousness iron ore, also the oxide skin that produces in Iron-smelting can be encased in the upper strata as described iron-bearing material, described upper strata is counted 5～12% scope for the upper surface apart from described raw material packing layer with the bed thickness ratio with respect to total bed thickness.
(4) in the manufacture method according to above-mentioned (1) described agglomerate, also can be in described upper strata and the described lower floor of described raw material packing layer, with identical mixing ratio pack into described solid fuel and described returning mine.
(5) in the manufacture method according to above-mentioned (1) described agglomerate, about the described auxiliary material in the described raw material packing layer of packing into, the mixing ratio on described upper strata also can be less than or equal to the mixing ratio of described lower floor.
(6) in the manufacture method according to above-mentioned (1) described agglomerate, after with described auxiliary material, described solid fuel and described return mine cooperation and mixing, granulation, also described high liquation perviousness iron ore and described other iron ore can be respectively charged into described upper strata and the described lower floor of described raw material packing layer.
(7) in the manufacture method according to above-mentioned (6) described agglomerate, the described oxide skin that produces in described Iron-smelting coordinates as described iron-bearing material, and after described auxiliary material, described solid fuel and described return mine cooperation and mixing, granulation, also described high liquation perviousness iron ore can be encased in the described upper strata of described raw material packing layer.
The effect of invention
According to the present invention, below adopting in the manufacture method of the agglomerate of attraction type sinter machine, each kind iron ore that is engaged in raw materials for sintering is estimated to the liquation perviousness of micro mist section, based on this evaluation result, in the iron ore of each kind, the iron ore of the kind of selected liquation superior permeability to micro mist section is by being encased in selectively the upper strata of raw material packing layer, can improve yield rate and the intensity on the upper strata of raw material packing layer, improve the productivity of agglomerate.
Description of drawings
Fig. 1 means the figure of microscope tissue in the simulation particle cross section of the raw materials for sintering that gathers from the raw material packing layer of sinter machine.
Fig. 2 means the figure of relation of the strength S I of the liquation penetration distance of iron ore and the agglomerate in the real machine sintering operation.
Fig. 3 means the figure of relation of the yield rate of the liquation penetration distance of iron ore and the agglomerate in the real machine sintering operation.
The figure that locates of the liquation penetration distance in the tablet after Fig. 4 means and burns till.
Fig. 5 means the figure of comparison of liquation penetration distance of the iron ore of principal item.
Fig. 6 means the figure of the relation of the intensity index (+0.5mm% value) of being measured by shatter test in the liquation penetration distance of iron ore and tablet firing test.
Fig. 7 means pack into the figure of relation of strength S I of the agglomerate in the test of bed thickness ratio and sintering pot of top.
Fig. 8 means pack into the figure of relation of yield rate of the agglomerate in the test of bed thickness ratio and sintering pot of top.
Fig. 9 means liquation penetration distance and the Al of iron ore
2O
3The figure of the relation of containing ratio.
Figure 10 means the figure of the relation of the yield rate of the agglomerate in the test of Wingdale ratio and sintering pot in the upper strata.
Figure 11 means the figure of the relation of the strength S I of the agglomerate in the test of Wingdale ratio and sintering pot in the upper strata.
Figure 12 means the figure of the loaded condition of the raw materials for sintering that the sintering pot of embodiment is tested.
Figure 13 means the figure of an example that high liquation perviousness iron ore and other iron ore is respectively charged into the method for the upper strata of raw material packing layer and lower floor.
Embodiment
At first, technological thought of the present invention is described.
Fig. 1 means the figure of opticmicroscope tissue in the simulation particle cross section of the raw materials for sintering that gathers from the raw material packing layer of sinter machine.
It is believed that, in sintering process, the initial stage liquation is at iron ore (Fe
2O
3) part that contacts with Wingdale (CaO) generates.But, as shown in Figure 1, according to the microscopic examination of adhering to powder section (micro mist section) of the simulation particle of raw materials for sintering (being consisted of by the nuclear particle more than particle diameter 1mm and the powder section of adhering to below the particle diameter 0.5mm around it), iron ore (Fe
2O
3) and Wingdale (CaO) distribute brokenly, so their the contact part few.
Can think thus, in the sintering process of reality, sintering reaction is undertaken by the following stated.I.e. iron ore (Fe in the powder section of adhering to of the simulation particle of raw materials for sintering
2O
3) part that contacts with Wingdale (CaO), generate ferro-calcium elements body (CaO-Fe
2O
3) the initial stage liquation.Then, the initial stage liquation is to adhering to powder section inner penetration, contacts with on every side iron ore or auxiliary material, repeatedly assimilates, zoarium.So increase the liquation amount, form agglomerate in conjunction with phase.
Have again, the inventor etc. understood the initial stage liquation that generates in sintering process to the behavior of iron ore packing layer inner penetration, be the mineralogical character that the liquation perviousness depends on iron ore, combination to agglomerate is formed with considerable influence mutually (with reference to ISIJ-Int.43 (2003), p.1384).
The temperature on the upper strata of the raw materials for sintering packing layer in sintering operation easily reduces, and from iron ore (Fe
2O
3) and the initial stage liquation of Wingdale (CaO) to be generated to the time that sintering reaction (anabolic reaction) finishes short.Thus, the inventor etc. think, yield rate for the agglomerate on the upper strata of improving the raw material packing layer, the high iron ore of liquation perviousness of packing into selectively on the upper strata of raw material packing layer, the initial stage liquation of generation is promptly permeated in raw material micro mist section, thereby promote that anabolic reaction is effective.
The present invention is based on this technological thought and completes, relate to iron-bearing material, auxiliary material (Wingdale etc.), the solid fuel (coke etc.) by the iron ore that will comprise many kinds (iron ore kind) and return mine and coordinate and as raw materials for sintering, after this raw materials for sintering mixing, granulation, be encased in the manufacture method of the agglomerate that burns till on pallet, it has following characteristics.Namely, it is characterized in that, each kind of described iron ore is carried out the infiltrative evaluation test of liquation, measured value based on the liquation penetration distance of each kind, will be from the iron ore of above-mentioned many kinds reach mode more than 4.0mm with the liquation penetration distance and select or coordinate the iron ore that consists of by more than a kind, then to be enclosed in the upper strata apart from the upper surface that is formed at the raw material packing layer on above-mentioned pallet in the mode that reaches 5～12% scope with respect to the bed thickness ratio of total bed thickness (top pack into bed thickness ratio).
In the present invention, for the solution perviousness of iron ore (the initial stage liquation is the easy diffustivity during infiltration in iron ore powder below 0.5mm to particle diameter) and liquation penetration distance (penetration distance of the liquation in iron ore powder), can wait the evaluation test (hereinafter referred to as " the solution perviousness evaluation test of iron ore ") of proposition in TOHKEMY 2002-62290 communique etc. to estimate, measure according to inventor.
For this liquation penetration distance, when the iron ore as raw materials for sintering coordinates the iron ore of two or more kinds, for the simplification of measuring, the weighted mean of the liquation penetration distance of the iron ore of each kind that use is measured.In the following, in the situation that employing is combined with the iron ore of two or more kinds, also this weighted mean is shown as the liquation penetration distance.Have again, also can coordinate the iron ore of many kinds, its iron ore as a kind of kind is measured the liquation penetration distance.
In addition, the liquation penetration distance in the present invention is by above-mentioned liquation perviousness evaluation test evaluation of the present invention, but also can estimate the liquation perviousness by other evaluation test, then the liquation penetration distance in the conversion cost invention.For example, size or shape, the test sequence etc. of compacting pressure, iron ore tablet and the initial stage liquation material piece of liquation perviousness evaluation test that also can be by changing above-mentioned iron ore are estimated, then the liquation penetration distance in the conversion cost invention.In addition, for example, also can be by measuring liquation in the penetration time of the distance of regulation, the liquation penetration distance in the conversion cost invention then is so long as that the temperature variation of infiltration weight or anabolic reaction etc. can be converted into the physical quantity of the liquation penetration distance in the present invention is just passable.
The liquation perviousness evaluation test of the iron ore in the present invention is undertaken by following main points, measures the liquation penetration distance.
As the iron ore sample, the ratio take particle diameter as 0.25mm～0.5mm as 50 % by weight and particle diameter the mode as the ratio below 0.25mm as 50 % by weight carry out the granularity adjustment, and fully mix.Then, adopt metal die shaping overflow mould, take compacting pressure as 4MPa, the iron ore sample is formed, the manufacturing diameter is that 15mm, height are the iron ore tablet of 5mm (utilizing the voidage (ventilate rate) that mercury penetration method records to be about 30%).
On the other hand, reach close to CaO-Fe with initial stage liquation material
2O
3CaO:26 quality %, the Fe of eutectic composition of binary constitutional diagram
2O
3: the mode of the composition of 74 quality % coordinates Fe
2O
3Reagent and CaO reagent mixed 20 minutes with automatic mortar.Then, with the iron ore tablet similarly, adopt metal die shaping overflow mould, take compacting pressure as 4MPa, initial stage liquation material is formed, manufacturings diameter is that 5mm, height are the initial stage liquation material piece of 5mm.
In addition, above-mentioned initial stage liquation material piece is positioned in central part above above-mentioned iron ore tablet, the Ni rounding tubular of packing into crucible (internal diameter 20mm, high 15mm) in electric furnace, heats in air draught, burns till.Then, measure the liquation penetration distance by the cross-section of the tablet after burning till.
Have, in the mensuration of the liquation penetration distance in the tablet after burning till, vertically cut off at the radially central part of tablet, abrasive cutting-off face then utilizes the mineral tissue of observation by light microscope cut surface shown in Figure 4.In the section structure of photography, preferably namely survey penetration distance in (2) and (4) this 3 place at the intermediate point separately of width (tablet radially) central part (3) of the part of liquation shown in Figure 4 infiltration, this central part (3) and outer end (1) and (5), obtain the liquation penetration distance from their mean value.
In above-mentioned evaluation test, the firing condition of tablet uses and the similar sintering heating mode of real machine.That is, after tablet was heated to 1290 ℃ (top temperatures) from 1100 ℃ with 1 minute, be cooled to 1100 ℃ from 1290 ℃ with 3 minutes, then immediately tablet taken out the outer air cooling of stove.
The real machine sintering operation that comprises the iron-bearing material of many kinds iron ore about employing, Fig. 2 illustrate the relation of the strength S I of the liquation penetration distance of iron ore and agglomerate, and Fig. 3 illustrates the relation of the yield rate of the liquation penetration distance of iron ore and agglomerate.
The index of intensity of expression agglomerate is that SI can be the agglomerate 10kg of 10～25mm by gathering particle diameter the agglomerate after following yield rate is measured, and makes it fall 4 times from the height of 2m and measures.This SI represents the quality (kg) with respect to the agglomerate before falling, and the particle diameter after falling is the ratio (quality %) of the quality (kg) of the above agglomerate of 5mm.
The yield rate of agglomerate can make by the height from 2m sinter cake (piece) fall 5 times and measure.The yield rate of this agglomerate represents the quality (kg) with respect to the sinter cake (piece) before falling (wherein remove shop fixtures ore deposit part), and the particle diameter after falling is the ratio (quality %) of the quality (kg) of the above agglomerate of 5mm (wherein remove shop fixtures ore deposit part).
Learn according to Fig. 2 and Fig. 3: in the raw materials for sintering that comprises many kinds iron ore, if the liquation penetration distance increases, the yield rate of agglomerate and SI improve.
That is to say, the above results teaches: as the infiltrative index of the liquation of iron ore, adjust the method for cooperation of each kind of the iron ore in raw materials for sintering based on the liquation penetration distance, utilizing yield rate and the intensity of the agglomerate of real machine manufacturing for raising is effective.
Moreover as shown in Figures 2 and 3, in the real machine sintering operation, the strength S I that obtains agglomerate is more than 90.5%, and yield rate is more than 80.0%.
Then, to in the present invention, the proper range of the intensity of the agglomerate on the upper strata of raising raw material packing layer and yield rate (strength S I is more than 90.5%, and yield rate is more than 80.0%) the liquation perviousness of necessary iron ore, the liquation penetration distance of namely measuring in the evaluation test of liquation perviousness describes.
The liquation penetration distance of measuring in the chemical composition composition of the iron ore of the principal item that coordinates in raw materials for sintering shown in table 1 and the evaluation test of liquation perviousness.
[table 1]
In table 1, two kinds of Brazilian ores that produce of B (a) and B (b) expression, two kinds of Australia product hematite ores of H (a) and H (b) expression, two kinds of Australia product Marra Mamba ores of M (a) and M (b) expression.Two kinds of high Rock Phosphate (72Min BPL) of Australia product of HP (a) and HP (b) expression, two kinds of Australia product peastone ores of P (a) and P (b) expression, HPM represents the novel mixed ore of Australia product, two kinds of India's product ores of I (a) and I (b) expression.In addition, S1 and S2 are illustrated in the oxide skin that produces in two kinds of Iron-smeltings.
Fig. 5 means the figure of comparison of liquation penetration distance of the iron ore of the principal item shown in table 1.Learn according to table 1 and Fig. 5: in the iron ore of principal item, two kinds of Brazil produce the liquation penetration distance of ore B (a) and B (b) all up to more than 4.0mm.
On the other hand, learn: two kinds of Australia is produced the liquation penetration distance that hematite ore H (a) and H (b), two kinds of Australia produces high Rock Phosphate (72Min BPL) HP (a) and HP (b) and two kinds of Australia product peastone ore P (a) and P (b) and is all hanged down below 2.0mm.
In addition, learn: Australia is produced novel mixed ore HPM, two kinds of Australia and is produced liquation penetration distance that Marra Mamba ore M (a), M (b) and two kinds of India produces ore I (a) and I (b) over 2.0mm and lower than the scope of 4.0mm.
Have, the crystal water content that peastone ore P (a) and P (b) are produced in Australia is high again, and easily assimilation melting, be known as easy meltbility iron ore in sintering reaction.But, learn that the liquation penetration distance of Australia product peastone ore P (a) and P (b) is low below 2.0mm, the liquation perviousness is bad.In addition, the liquation penetration distance of the oxide skin S1 that produces in Iron-smelting and S2 has more different because of the kind of oxide skin.
Then, for the iron ore of the different many kinds of the liquation perviousness that adopts table 1, the intensity of the agglomerate the during upper strata of the raw materials for sintering packing layer of selectively it being packed into and the raising effect of yield rate are confirmed by the tablet firing test.
The sample of using as the tablet firing test, the iron ore of the many kinds shown in table 1 is pulverized, the iron ore of adjusting to particle diameter and be 0.25～0.25mm contains 50 % by weight and particle diameter is the granularity that the following iron ore of 0.25mm contains 50 % by weight, mix the Wingdale below 0.25mm in these various iron ores, make CaO concentration reach 10 quality %.
Adopt metal die shaping overflow mould, with the compacting pressure of 4MPa, it is that 8mm, height are the tablet of 10mm (voidage is approximately 30%) that these samples are configured as diameter.
In the tablet firing test, be 20mm, high in the Ni rounding tubular crucible of 15mm with the sample tablet internal diameter of packing into, in electric furnace, burn till in air draught.The firing condition of tablet uses and the similar sintering heating mode of real machine.That is, after tablet was heated to 1290 ℃ (top temperatures) from 1100 ℃ with 1 minute, be cooled to 1100 ℃ from 1290 ℃ with 3 minutes, then immediately tablet taken out the outer air cooling of stove.
In the intensity evaluation of burning till tablet after burning till, burn till to one iron counterweight that tablet makes 300g and fall the shatter test of 3 times.After sample (burning till tablet) after having mixed this test, use the 0.5mm screen sizing.As intensity index (+0.5mm% value), obtain the quality percentage with respect to the sample more than the 0.5mm of bulk sample quality.
In the real machine sintering operation, the strength S I that obtains agglomerate is more than 90.5%, and yield rate is more than 80.0%.
For the metewand of the intensity of determining to burn till tablet, be captured in advance the strength S I that makes in the real machine sintering operation and be more than 90.5%, yield rate is the agglomerate more than 80.0%, implements above-mentioned shatter test.In this shatter test, adopt to be processed into pot and test with the identical shape of tablet, be that diameter is that 8mm, height are the sample of the plate shape of 10mm.The intensity index that to measure in this shatter test (+0.5mm% value) is as metewand.
Have, adopt that the strength S I make is 90.5% or more, yield rate is the agglomerate more than 80.0% in the real machine sintering operation, the intensity index (+0.5mm% value) by above-mentioned shatter test mensuration is 88%.So in burning till the intensity evaluation of tablet, the intensity index (+0.5mm% value) of above-mentioned shatter test is satisfied the tablet that burns till more than 88%, and to be evaluated as intensity and the yield rate of agglomerate good.
The relation of the liquation penetration distance of each kind iron ore in the firing test of tablet shown in Fig. 6 and the intensity index of shatter test (+0.5mm% value).
As shown in Figure 6, for the intensity index (+0.5mm% value) of the above-mentioned shatter test more than 88% that reaches the target sinter strength (SI is more than 90.5%) that is equivalent in the real machine sintering operation, needing the liquation penetration distance is the above liquation perviousness of 4.0mm.
Be the infiltrative iron ore kind of liquation more than 4.0mm for having the liquation penetration distance, routine Brazil that lists as shown in table 1 produces ore B (a) and B (b) particularly.
In the present invention, for the intensity of the agglomerate on the upper strata of improving the raw materials for sintering packing layer and yield rate (strength S I is more than 90.5%, yield rate be more than 80.0%), on the upper strata of the specialized range of raw materials for sintering packing layer, so that the liquation penetration distance reaches the iron ore that the above mode of 4.0mm is packed into and consisted of by more than a kind.
As mentioned above, when the iron ore in the upper strata of the specialized range that is encased in the raw materials for sintering packing layer contains the iron ore of two or more kinds, so that the weighted mean of the liquation penetration distance of the iron ore of each kind of measuring by the infiltrative evaluation test of liquation reaches the mode more than 4.0mm, adjust the mixing ratio of the iron ore of two or more kinds.
In the following, with mode more than 4.0mm is selected or the iron ore by consisting of more than a kind that coordinates is defined as high liquation perviousness iron ore so that the liquation penetration distance reaches.
The top of the high liquation perviousness iron ore relation of strength S I of bed thickness ratio and agglomerate of packing into of packing into shown in Fig. 7.Equally, the relation of yield rate of bed thickness ratio and agglomerate of packing into of top shown in Fig. 8.
The index of the intensity of expression sintered ore is SI, is the agglomerate 10kg of 10～25mm by gathering particle diameter the agglomerate after following yield rate is measured, and makes its height from 2m fall 4 times and measures.This SI represents that the particle diameter after falling is the ratio (quality %) of the above sinter quality (kg) of 5mm with respect to falling front sinter quality (kg).
The yield rate of agglomerate is measured by making sinter cake (piece) fall 5 times from the height of 2m.The yield rate of this agglomerate represents the quality (kg) with respect to the sinter cake (piece) before falling (wherein remove shop fixtures ore deposit part), and the particle diameter after falling is the ratio (quality %) of the quality (kg) of the above agglomerate of 5mm (wherein remove shop fixtures ore deposit part).
Have, Fig. 7 and Fig. 8 are illustrated in upper strata (A section) and the lower floor (B section) of the sintering pot of high 600mm shown in Figure 12, diameter 300mm, are respectively charged into high liquation perviousness iron ore and other iron ore, the test-results when burning till again.Have again, coordinate Wingdale, coke and return mine by the mean value of upper strata (A section) and lower floor (B section), so that the SiO in raw materials for sintering
2: 5.01 quality %, CaO/SiO
2: 1.89, coke: 4.3 quality % reach prescribed value.These raw materials for sintering are using after 7.0 quality % granulations take granulation water.Here, other iron ore refers to the iron ore iron ore in addition on the upper strata of packing into.
The firing condition of this sintering pot test is bed thickness: 600mm, attraction negative pressure: 14.7KPa, firing time: 27 minutes.
To the intensity of the agglomerate in this sintering pot test and yield rate take the strength S I of agglomerate as 77%, yield rate estimates as 76% as benchmark.These metewands are in the situation that carry out the real machine sintering operation, and the strength S I that confirms in advance agglomerate is more than 90.5% by adopting, yield rate is the raw materials for sintering of the matching requirements shown in table 2 more than 80.0%, carries out this sintering pot and tests to obtain.So these metewands are equivalent in the real machine sintering operation strength S I (more than 90.5%) and the yield rate (more than 80.0%) as the agglomerate of target.
That is to say, in this sintering pot test, with the strength S I of agglomerate be more than 77%, yield rate is that 76% to be evaluated as intensity and the yield rate of agglomerate when above good.
As shown in Figures 7 and 8, for the strength S I that realizes the agglomerate in the test of above-mentioned sintering pot is 77% or more, yield rate is more than 76%, the needs top of the high liquation perviousness iron ore bed thickness ratio (with respect to the bed thickness ratio of total bed thickness on raw material packing layer upper strata) of packing into of packing into is defined as 5～12% scope.
The bed thickness ratio pack on the top of the high liquation perviousness iron ore of packing into lower than 5% the time, can not fully obtain the raising effect of yield rate, intensity and productivity of agglomerate on upper strata of the raw material packing layer that brings of selectively packing into of the iron ore of liquation superior permeability.
The bed thickness ratio pack on the top of the high liquation perviousness iron ore of packing into higher than 12% the time, and as described later, the granulation of the iron ore that the liquation perviousness is high is low, and simulation particle breaks when sinter machine is packed into and in sintering process, and the air permeability in the raw material packing layer easily reduces.Therefore, the coking property of raw material packing layer integral body worsens, and the yield rate of agglomerate, intensity and productivity worsen.
In addition, the iron ore that the liquation perviousness is high is Al as described later
2O
3The ore that containing ratio is low, relative price is high.Therefore, become the reason that causes the agglomerate manufacturing cost to rise.
for the above-mentioned reasons, substantially improve the yield rate on upper strata of raw material packing layer and intensity (strength S I is more than 90.5% for the air permeability that does not make raw material packing layer integral body reduces, yield rate is more than 80.0%), be defined as and will be from the iron ore of many kinds reach with the weighted mean of liquation penetration distance that mode more than 4.0mm is selected or the high liquation perviousness iron ore that coordinates is encased in the upper strata, described upper strata for apart from the upper surface of raw material packing layer to count 5～12% scope with respect to the bed thickness ratio of total bed thickness, other iron ore is encased in the lower floor of raw material packing layer, and with auxiliary material, upper strata and the lower floor of solid fuel and the charging feedstock packing layer of returning mine.Have, only otherwise explanation especially in advance, auxiliary material, solid fuel and the mixing ratio of returning mine are identical in upper strata and the lower floor of raw material packing layer again.
In addition, except high liquation perviousness iron ore, the oxide skin S1 that produces in Iron-smelting and S2 also can be used as iron-bearing material to be encased in the top bed thickness ratio of packing into are the upper strata of 5～12% scope.Equally, except other iron ore, above-mentioned oxide skin S1 and S2 also can be used as iron-bearing material and are encased in lower floor.Below, only with high liquation perviousness iron ore or the iron-bearing material that coordinates high liquation perviousness iron ore and oxide skin as high liquation perviousness iron-bearing material.In addition, only with other iron ore or the iron-bearing material that coordinates other iron ore and oxide skin as other iron-bearing material.
Liquation penetration distance and the Al of the iron ore of each kind shown in Fig. 9
2O
3The relation of containing ratio.As shown in Figure 9, liquation penetration distance and Al
2O
3Containing ratio has correlationship, is iron ore more than 4.0mm as having the liquation penetration distance, preferably selected Al
2O
3Containing ratio is the following iron ore kind of 0.6 quality %.
The liquation perviousness of iron ore is not only by Al
2O
3Containing ratio determines, also is subjected to the impact of structure of the pore etc. of iron ore.But, if the Al in iron ore
2O
3Containing ratio uprises, the Al in the assimilation liquation that generates
2O
3Containing ratio also uprises.Therefore, the viscosity of liquation is high, and the liquation perviousness reduces.
So in the present invention, the liquation penetration distance on the upper strata of charging feedstock packing layer is the above preferred Al of iron ore of 4.0mm
2O
3Containing ratio is below 0.6 quality %.
In addition, as previously mentioned, in order to keep the air permeability of raw material packing layer integral body, need to prevent that the liquation on the upper strata of raw material packing layer from excessively increasing.In addition, for cutting down cost, preferably cut down auxiliary material.Therefore, investigate liquation and formed needed auxiliary material, the particularly Wingdale ratio in the upper strata to the impact of coking property.
The relation of the yield rate of the agglomerate in the test of the ratio of Wingdale and sintering pot in the upper strata shown in Figure 10.In addition, the relation of the strength S I of the agglomerate in the test of the ratio of Wingdale and sintering pot in the upper strata shown in Figure 11.In an embodiment of the present invention, as the high liquation perviousness iron ore in the upper strata, use Brazil to produce ore B (b), the top bed thickness ratio of packing into is made as 11.7%.In addition, use the mixing ratio raw materials for sintering shown in table 2.
As shown in Figure 10,11, by using high liquation perviousness iron ore as the iron ore in the upper strata, SI and yield rate improve.In addition, by reducing the Wingdale ratio in the upper strata, SI and yield rate increase.
So about the auxiliary material of charging feedstock packing layer, from the viewpoint of cutting down cost, the mixing ratio of the auxiliary material on preferred upper strata is below the mixing ratio of the auxiliary material of lower floor.
In the present invention, there is no particular limitation high liquation perviousness iron ore and other iron-bearing material to be respectively charged into the method for lower floor of the upper strata of the raw material packing layer on pallet and raw material packing layer, for example can adopt method shown in Figure 13.
Below attraction type sinter machine give ore deposit section, in series dispose the 1st buffering bucket (other iron-bearing material with) the 1 and the 2nd buffering bucket (high liquation perviousness iron-bearing material with) 2 along the machine length direction.To be encased on pallet 4 by other iron-bearing material and Wingdale, coke except high liquation perviousness iron-bearing material and the raw materials for sintering 3 that consists of of returning mine from the 1st buffering bucket 1, form the lower floor 5 of raw material packing layer.Then, pack into by high liquation perviousness iron-bearing material and Wingdale, coke and the raw materials for sintering 6 of returning mine and consisting of from the 2nd buffering bucket 2, can form the upper strata 7 of raw material packing layer in above-mentioned lower floor 5.
Have again; will be by high liquation perviousness iron-bearing material and Wingdale, coke and the raw materials for sintering 6 that consists of and by other iron-bearing material and Wingdale, coke and the raw materials for sintering 3 of returning mine and consisting of of returning mine; these two kinds of raw materials for sintering adopt respectively that the tablets presss 8,9 such as drum agitator, pan pelletizer mix, granulation, form simulation particle.Then, each raw materials for sintering is supplied to the 2nd buffering bucket (high liquation perviousness iron-bearing material is used) the 2 and the 1st buffering bucket (other iron-bearing material is used) 1.
In addition, will be by high liquation perviousness iron-bearing material and Wingdale, coke and the raw materials for sintering 6 of returning mine and consisting of, and by other iron-bearing material and Wingdale, coke and the raw materials for sintering 3 of returning mine and consisting of, these two kinds of raw materials for sintering as mentioned above, with Wingdale, coke and the mode of the mixing ratio that reaches regulation of returning mine coordinate.
[the first embodiment]
Below, with embodiment, effect of the present invention is described.
As raw materials for sintering, the average matching requirements when operating take the real machine shown in table 2 adopts high 600mm shown in Figure 12, the sintering pot of diameter 300mm as benchmark, implements the sintering pot test.
[table 2]
Have again, in the situation that the raw materials for sintering of the matching requirements shown in employing table 2 carries out the real machine sintering operation, confirm in advance to obtain strength S I and be more than 90.5%, yield rate is the agglomerate more than 80.0%.
In addition, to yield rate, cold strength SI, the index of anti-reduction degradation RDI of the productivity in sintering pot test, the agglomerate that obtains, be reduced rate JIS-RI (%) and measure.Its result together is shown in Table 3 with creating conditions.Have, productivity represents with pot area (m again
2) and sintering time (my god) value that draws divided by the quality (t) that is the agglomerate more than 5mm except particle diameter the shop fixtures ore deposit.
It is the agglomerate 10kg of 10～25mm that the strength S I of agglomerate can gather particle diameter the ore deposit by burning till after following yield rate is measured, and makes it fall 4 times from the height of 2m and measures.This SI represents the quality (kg) with respect to the agglomerate before falling, and the particle diameter after falling is the ratio (quality %) of the quality (kg) of the above agglomerate of 5mm.
The yield rate of agglomerate can be measured by making sinter cake (piece) fall 5 times from the height of 2m.The yield rate of this agglomerate represents the quality (kg) with respect to the sinter cake (piece) before falling (wherein remove shop fixtures ore deposit part), and the particle diameter after falling is the ratio (quality %) of the quality (kg) of the above agglomerate of 5mm (wherein remove shop fixtures ore deposit part).
The index of anti-reduction degradation of agglomerate (RDI) is measured according to the test method of regulation in JIS M 8720.That is to say, gathering particle diameter is the agglomerate 500g of 15～19mm, at N
2: 70%, in the mixed gas of CO:30%, reduction is 30 minutes under 550 ℃.Then, the agglomerate cylinder of packing into reduction carries out the whirl test of 30 minutes 900 times.With respect to the quality (g) of agglomerate after the reduction before rotation, postrotational particle diameter is that the ratio (quality %) of the quality (g) of the following agglomerate of 3mm is the index of anti-reduction degradation the (RDI).
The JIS reduction ratio (JIS-RI) of agglomerate is measured according to the test method of regulation in JIS M 8713.That is to say, gathering particle diameter is the agglomerate 500g of 19～21mm, at N
2: 70%, in the mixed gas of CO:30%, reduction is 180 minutes under 900 ℃.With respect to oxygen containing quality (g) in the ferric oxide of the agglomerate before reduction, the ratio (quality %) of the reduction (g) of the sinter quality that reduction brings is JIS reduction ratio (JIS-RI).
Be encased in the raw material packing layer the upper strata high liquation perviousness iron-bearing material by with Wingdale, return mine and coke mixes and carry out granulation forms simulation particle, the A section of then packing into shown in Figure 12 (upper strata of raw material packing layer).Have, Wingdale, coke and the mixing ratio of returning mine are identical with mixing ratio in charging feedstock integral body again.
In addition, other iron-bearing material and above-mentioned same, by with Wingdale, return mine and coke mixes and carry out granulation forms simulation particle, the B section of then packing into shown in Figure 12 (lower floor of raw material packing layer).Coke in the A section of raw materials for sintering packing layer and B section and Wingdale (CaO) and being in equal proportions of returning mine.
In addition, be used for packing into the high liquation perviousness iron-bearing material of A section be two kinds of different Brazil of the liquation penetration distance shown in table 1 produce two kinds of different Australia of ore B (a) and B (b), liquation penetration distance produce peastone ore P (a) and P (b), and iron ore and the Australia of mixing these ores produce novel mixed ore HPM and two kinds of different oxide skin S1 and S2 that produce at Iron-smelting of liquation penetration distance.
In the present embodiment, from the grate face of pallet with the 530mm that packs into of B section, in B section with the bed thickness of 70mm (with respect to the bed thickness ratio of total bed thickness (600mm): 11.7%) the A section of packing into.
In addition, the SiO in the cooperation raw material of regulation A section and B section
2Be 5.01 quality %, CaO/SiO
2Be 1.89, coke coordinates is 4.3 quality % (ratio with raw materials for sintering integral body is identical respectively), it is 7.0 quality % that the granulation condition is defined as granulation water.In addition, the firing condition with this sintering pot test is defined as bed thickness: 600mm, attraction negative pressure: 14.7KPa, firing time: 27 minutes.Each test-results shown in table 3 is the mean value of the measured value of n=2 time.
Reference example 1 is to fill packed into the equably basic test of the many kinds iron ore shown in table 2 of bed thickness direction as raw materials for sintering.The evaluation of the strength S I of embodiment shown below and the agglomerate of comparative example, yield rate, productivity etc. is estimated take reference example 1 as benchmark.
In embodiment 1 and embodiment 2, compare with reference example 1, can improve yield rate and the strength S I of agglomerate in the situation that do not damage the RDI of anti-the reduction degradation and be reduced rate JIS-RI, boost productivity.
In the A of embodiment 3 section, the liquation penetration distance of the mixture of the iron ore of the B that packs into selectively (a) and P (a) (according to the weighted mean of the ratio of mixture of each liquation penetration distance of B (a) and P (a)) is 4.12mm.Therefore, compare with reference example 1, can improve yield rate and the strength S I of agglomerate in the situation that do not damage the RDI of anti-the reduction degradation and be reduced rate JIS-RI, boost productivity.
The liquation penetration distance of the mixture of the B (a) of the A section of packing into selectively of embodiment 4 and the iron ore of S1 (according to the weighted mean of the ratio of mixture of each liquation penetration distance of B (a) and S1) is 4.28mm.Therefore, compare with reference example 1, can improve yield rate and the strength S I of agglomerate in the situation that do not damage the RDI of anti-the reduction degradation and be reduced rate JIS-RI, boost productivity.
In addition, the liquation penetration distance of the mixture of the iron ore of the B (a) of the A section of packing into selectively of embodiment 5 and S2 (according to the weighted mean of the ratio of mixture of each liquation penetration distance of B (a) and S2) is 4.28mm.Therefore, compare with reference example 1, can improve yield rate and the strength S I of agglomerate in the situation that do not damage the RDI of anti-the reduction degradation and be reduced rate JIS-RI, boost productivity.
On the other hand, comparative example 1 is that Brazil that the liquation penetration distance shown in table 1 is 4.22mm is produced ore B (b) and liquation penetration distance is that peastone ore P (b) mixing is produced to reach ratio of mixture P (b): B (b)=45: 55 in Australia of 1.23mm, and the A section of packing into selectively, with pack into the example of B section of remaining iron-bearing material.
The liquation penetration distance of the mixture of the B (b) of the A section of packing into selectively of comparative example 1 and the iron ore of P (b) (according to the weighted mean of the ratio of mixture of each liquation penetration distance of B (b) and P (b)) is low to 2.87mm.Therefore, compare with reference example 1, the yield rate of agglomerate and strength S I reduce, and productivity also reduces.
Comparative example 2 is that peastone ore P (a) the A section of packing into is selectively produced in Australia that the liquation penetration distance shown in table 1 is 1.12mm, with pack into the example of B section of remaining iron-bearing material.
Comparative example 3 is that peastone ore P (b) the A section of packing into is selectively produced in Australia that the liquation penetration distance shown in table 1 is 1.23mm, with pack into the example of B section of remaining iron-bearing material.
In comparative example 2 and comparative example 3, the liquation penetration distance of the P (a) of the A section of packing into selectively and the iron ore of P (b) is all low to 1.12mm and 1.23mm respectively.Therefore, compare with reference example 1, the yield rate of agglomerate and strength S I reduce, and productivity also reduces.
[the second embodiment]
Then, under the condition identical with the embodiment 1 that implements by [the first embodiment], pack into bed thickness ratio (from the bed thickness ratio with respect to total bed thickness of upper surface) in the top of namely producing ore B (a) except Brazil of the A section (upper strata of raw material packing layer) of packing into, in identical condition, only change the top bed thickness ratio of packing into, similarly test.Have, reference example 1 is the condition identical with the condition of [the first embodiment] again.
In addition, with [the first embodiment] similarly, yield rate and the cold strength SI of the productivity in sintering pot test, the agglomerate that obtains measured.The results are shown in table 4.
[table 4]
Brazil is produced ore B (a) with top pack into the embodiment 1～3 of A section of mode that the bed thickness ratio reaches 5～12% scope that packs into, compare with reference example 1, in the situation that do not damage the RDI of anti-the reduction degradation and be reduced rate JIS-RI, improve yield rate and the strength S I of agglomerate, improved productivity.
On the other hand, reach the comparative example 1 and 2 and Brazil is produced ore B (a) and pack into top during the bed thickness ratio reaches the comparative example 3 and 4 of the A section of packing into greater than the mode of 12% scope of the A section of packing into lower than the mode of 5% scope Brazil being produced ore B (a) the bed thickness ratio of packing into top, compare with reference example 1, the yield rate of agglomerate and strength S I reduce, and productivity also reduces.
Industrial utilizability
As previously mentioned, according to the present invention, below adopting in the manufacture method of the agglomerate of attraction type sinter machine, by the iron ore that is engaged in each kind in raw materials for sintering is estimated to the liquation perviousness of micro mist section, based on this evaluation result, in each kind iron ore, the iron ore of the kind of selected liquation superior permeability to micro mist section, and optionally be encased in the upper strata of raw material packing layer, and can improve thus yield rate and the intensity on the upper strata of raw material packing layer, improve the productivity of agglomerate.Thereby the utilizability of the present invention in steel industry is high.
Nomenclature
1 the 1st buffering bucket (other iron-bearing material is used)
2 the 2nd buffering buckets (high liquation perviousness iron-bearing material is used)
3 by other iron-bearing material, auxiliary material, coke and the raw materials for sintering of returning mine and consisting of
4 pallets
The lower floor of 5 raw material packing layers
6 by high liquation perviousness iron-bearing material, auxiliary material, coke and the raw materials for sintering of returning mine and consisting of
The upper strata of 7 raw material packing layers
8 tablets presss
9 tablets presss
Claims (7)
1. the manufacture method of an agglomerate, it is by the iron-bearing material that will comprise many kinds iron ore, auxiliary material, solid fuel and returns mine and coordinate and as raw materials for sintering, after these raw materials for sintering mixing, granulation, be encased in the manufacture method of the agglomerate that burns till on pallet, it is characterized in that
The liquation penetration distance by described each kind mensuration based on described iron ore, will be from the described iron ore of described many kinds reach mode more than 4.0mm with the weighted mean of described liquation penetration distance and select or coordinate and the high liquation perviousness iron ore that obtains is encased in the upper strata, described upper strata is for apart from being formed at the upper surface of the raw material packing layer on described pallet to count 5～12% scope with respect to the bed thickness ratio of total bed thickness;
Other iron ore is encased in the lower floor of described raw material packing layer;
And, with described auxiliary material, described solid fuel and described described upper strata and the described lower floor of returning mine and being encased in described raw material packing layer.
2. the manufacture method of agglomerate according to claim 1, is characterized in that, the Al of described high liquation perviousness iron ore
2O
3Content is below 0.6 quality %.
3. the manufacture method of agglomerate according to claim 1, it is characterized in that, except described high liquation perviousness iron ore, the oxide skin that produces in Iron-smelting is encased in the upper strata as described iron-bearing material, and described upper strata is counted 5～12% scope for the upper surface apart from described raw material packing layer with the bed thickness ratio with respect to total bed thickness.
4. the manufacture method of agglomerate according to claim 1, is characterized in that, in described upper strata and the described lower floor of described raw material packing layer, with identical mixing ratio pack into described solid fuel and described returning mine.
5. the manufacture method of agglomerate according to claim 1, is characterized in that, about being encased in the described auxiliary material in described raw material packing layer, the mixing ratio on described upper strata is less than or equal to the mixing ratio of described lower floor.
6. the manufacture method of agglomerate according to claim 1, it is characterized in that, after with described auxiliary material, described solid fuel and described return mine cooperation and mixing, granulation, described high liquation perviousness iron ore and described other iron ore are respectively charged into described upper strata and the described lower floor of described raw material packing layer.
7. the manufacture method of agglomerate according to claim 3, it is characterized in that, the described oxide skin that produces in described Iron-smelting coordinates as described iron-bearing material, and after described auxiliary material, described solid fuel and described return mine cooperation and mixing, granulation, described high liquation perviousness iron ore is encased in the described upper strata of described raw material packing layer.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008238448 | 2008-09-17 | ||
| JP2008-238448 | 2008-09-17 | ||
| PCT/JP2009/004679 WO2010032466A1 (en) | 2008-09-17 | 2009-09-17 | Sintered ore manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102159733A CN102159733A (en) | 2011-08-17 |
| CN102159733B true CN102159733B (en) | 2013-05-15 |
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| CN2009801361127A Expired - Fee Related CN102159733B (en) | 2008-09-17 | 2009-09-17 | Sintered ore manufacturing method |
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| JP (1) | JP4528362B2 (en) |
| KR (1) | KR101204525B1 (en) |
| CN (1) | CN102159733B (en) |
| BR (1) | BRPI0918512B1 (en) |
| WO (1) | WO2010032466A1 (en) |
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| JP5703616B2 (en) * | 2010-07-16 | 2015-04-22 | 新日鐵住金株式会社 | Method for producing sintered ore |
| CN103215442B (en) * | 2013-04-27 | 2014-07-02 | 河北钢铁股份有限公司邯郸分公司 | Thick-bed sintering feed surface-spraying covering agent and spraying method thereof |
| KR102043781B1 (en) * | 2017-12-26 | 2019-12-02 | 주식회사 포스코 | Method and apparatus for manufacturing sintered ores |
| TWI820935B (en) * | 2021-09-29 | 2023-11-01 | 日商日本製鐵股份有限公司 | Iron making method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002062290A (en) * | 2000-08-21 | 2002-02-28 | Nippon Steel Corp | Iron ore powder evaluating method |
| JP2006097083A (en) * | 2004-09-29 | 2006-04-13 | Nippon Steel Corp | Method for evaluating raw material for sintering, and blending design method |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6047887B2 (en) | 1982-03-06 | 1985-10-24 | 新日本製鐵株式会社 | Sintered ore manufacturing method |
| JPS62130229A (en) * | 1985-12-02 | 1987-06-12 | Sumitomo Metal Ind Ltd | Sintering operation method |
| JPS62130227A (en) * | 1985-12-03 | 1987-06-12 | Kawasaki Steel Corp | Method for sintering fine ore |
| JPH01240627A (en) * | 1988-03-23 | 1989-09-26 | Kawasaki Steel Corp | Method for sintering iron ore fines |
| JPH06346159A (en) * | 1993-06-07 | 1994-12-20 | Kawasaki Steel Corp | Production of sintered ore |
| KR100308830B1 (en) | 1997-07-18 | 2002-04-17 | 이구택 | Sintered ore manufacturing method for improving recovery ratio of sintered ore |
| KR100504365B1 (en) | 2000-08-19 | 2005-07-29 | 주식회사 포스코 | Manufacturing method of sinter ore in high combined water ore mixing |
-
2009
- 2009-09-17 WO PCT/JP2009/004679 patent/WO2010032466A1/en active Application Filing
- 2009-09-17 BR BRPI0918512-7A patent/BRPI0918512B1/en not_active IP Right Cessation
- 2009-09-17 CN CN2009801361127A patent/CN102159733B/en not_active Expired - Fee Related
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002062290A (en) * | 2000-08-21 | 2002-02-28 | Nippon Steel Corp | Iron ore powder evaluating method |
| JP2006097083A (en) * | 2004-09-29 | 2006-04-13 | Nippon Steel Corp | Method for evaluating raw material for sintering, and blending design method |
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| Publication number | Publication date |
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| BRPI0918512A2 (en) | 2015-12-01 |
| BRPI0918512B1 (en) | 2017-11-21 |
| JPWO2010032466A1 (en) | 2012-02-09 |
| WO2010032466A1 (en) | 2010-03-25 |
| KR20110042361A (en) | 2011-04-26 |
| KR101204525B1 (en) | 2012-11-23 |
| JP4528362B2 (en) | 2010-08-18 |
| CN102159733A (en) | 2011-08-17 |
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