CN102159733A - Sintered ore manufacturing method - Google Patents
Sintered ore manufacturing method Download PDFInfo
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- CN102159733A CN102159733A CN2009801361127A CN200980136112A CN102159733A CN 102159733 A CN102159733 A CN 102159733A CN 2009801361127 A CN2009801361127 A CN 2009801361127A CN 200980136112 A CN200980136112 A CN 200980136112A CN 102159733 A CN102159733 A CN 102159733A
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- liquation
- iron ore
- agglomerate
- sintering
- raw material
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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 424
- 229910052742 iron Inorganic materials 0.000 claims abstract description 207
- 238000005245 sintering Methods 0.000 claims abstract description 121
- 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 132
- 230000035515 penetration Effects 0.000 claims description 78
- 238000000034 method Methods 0.000 claims description 44
- 238000005469 granulation Methods 0.000 claims description 21
- 230000003179 granulation Effects 0.000 claims description 21
- 238000002156 mixing Methods 0.000 claims description 14
- 230000035699 permeability Effects 0.000 abstract description 22
- 239000007858 starting material Substances 0.000 abstract 6
- 239000000155 melt Substances 0.000 abstract 2
- 238000012360 testing method Methods 0.000 description 47
- 239000002245 particle Substances 0.000 description 41
- 238000006243 chemical reaction Methods 0.000 description 23
- 239000000203 mixture Substances 0.000 description 20
- 238000011156 evaluation Methods 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 12
- 230000002829 reductive effect Effects 0.000 description 12
- 238000010304 firing Methods 0.000 description 11
- 229910052500 inorganic mineral Inorganic materials 0.000 description 11
- 239000011707 mineral Substances 0.000 description 11
- 239000003595 mist 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
- 239000000843 powder 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
- 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
- 239000000047 product 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
- 230000004927 fusion Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 240000005373 Panax quinquefolius Species 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000013459 approach Methods 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
- 238000002485 combustion reaction Methods 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
- 238000007599 discharging 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
- 239000004615 ingredient Substances 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
Images
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
- 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 of the agglomerate that is used to improve the yield rate that is formed at the raw material packing layer top in the pallet and intensity.
The spy that the application filed an application in Japan based on September 17th, 2008 is willing to 2008-238448 number and advocates 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 exhaustionization of fine hematite ore is in development, and is present, 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 fine hematite ore to compare granularity little, and the content height of crystal water.Therefore, when sintering, these iron ores become the reason of air permeability reduction or sintering reaction deterioration.
From the existing peastone ore of peastone mineral deposit output is high crystal water ore.At 9 one-tenth from the iron ore of this peastone mineral deposit, Marra Mamba mineral deposit and high phosphorus Brockman mineral deposit output is that crystal water content is the iron ore more than the 4 quality %.
Below, the influence to sintering operation under the situation that is combined with high crystal water ore as raw materials for sintering is in a large number described.
Usually, adopt the manufacturing of the agglomerate of below attraction type sinter machine to be undertaken by following.
It is auxiliary materials such as required Wingdale of iron ore or the ironmaking iron-bearing materials such as ironmaking dust, the sintering reaction that produce in the operation and serpentinite that raw materials for sintering contains main raw material, as the solid fuels such as coke powder of thermal source, use by cooperating these raw materials.
Raw materials for sintering below packing in the attraction type sinter machine before, adopt 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 the nuclear particle more than the 1mm by particle diameter mainly and is that the powder that adheres to below the 0.5mm constitutes attached to the particle diameter around it.
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 the 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 the pallet from the ore deposit portion that gives of sinter machine, forms the raw material packing layer.Then, light the coke powder on raw material packing layer surface,, the point of ignition of coke powder is moved to the below of raw material packing layer by attract air from the sinter machine bottom with ignition furnace.
Utilize the combustion heat of this coke powder in turn to carry out sintering reaction to lower floor, finish sintering up to arriving ore discharge portion by mobile pallet from the upper strata of raw material packing layer.Sinter cake (piece) in the pallet is being pulverized discharging the back from ore discharge portion, makes the agglomerate that the blast furnace of designated size is used thus.
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 the raw materials for sintering as returning mine, and carries out sintering once more.
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 the iron-bearing material
2O
3With the reaction of CaO in the Wingdale, generate ferro-calcium elements body (CaO-Fe
2O
3) the initial stage liquation.Then, in this initial stage liquation, fuse into the composition in the iron ore and the anabolic reaction of the composition in the auxiliary material.
This sintering reaction is the very fast reaction that generation from the initial stage liquation finishes about with several minutes.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 then in sintering operation, the air permeability in the sintered layer worsens.Because of the sintering inequality takes place for the deterioration of this air permeability, so yield rate and productivity reduces, and sinter qualities such as intensity also worsen.
On the other hand, carry out when insufficient, be used to make the mutual bonded liquation of not fusing department of residual iron ore (residual raw ore) etc. to reduce, so yield rate reduces the quality deteriorated of intensity or reduction degradation agglomerate such as (RDI) at sintering reaction.
This sintering reaction has considerable influence to the granulation of the air permeability of the coking property (same voltinism) that cooperates the main raw material in the 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 sides raw materials for sintering packing layer.
As iron ore, under the situation that cooperates 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 the 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 fusion raw ore that comprises crackle.Consequently, agglomerate becomes the tissue of fragility and porous matter, and the yield rate of agglomerate is reduced, and sinter qualities such as intensity worsen.
In addition, as raw materials for sintering, under the situation of the iron ore of the content height that cooperates crystal water such as Marra Mamba ore or high Rock Phosphate (72Min BPL), fine size, 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 break easily when packing into.
Therefore, in the time of in chassis that raw material is packed into, do not have the micro mist iron ore of granulation or break after the micro mist particle 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.
Therefore, the micro mist particle of the iron ore that distributes in the upper layer side segregation of raw material packing layer also becomes and causes and result from the reason of problem of above-mentioned crystal water.
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.
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 cooperates 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, as method for quality such as the yield rate of the upper layer part that improves the raw materials for sintering packing layer and intensity, several different methods had been proposed 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 the granulation thing of returning mine, roll iron scale, magnetite contour FeO ferromagnetism raw material and ferromagnetism raw material and carbon material to be encased in the method (for example, with reference to patent documentation 2～6) of the skin section of raw material packing layer by utilizing the charging apparatus of magnetic.
In addition, consider the assimilation meltbility of the iron ore that is engaged in the raw materials for sintering, the easy meltbility iron ore that also proposed to pack on the upper strata of raw material packing layer is 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 in the skin section of raw material packing layer, pack into the ferromagnetism raw material that contains more FeO or easy meltbility iron ore etc., described FeO is easily and CaO or SiO in the auxiliary material
2Generate liquation (CaO-SiO
2-FeO).The purpose of these methods is to improve 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 the 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
In view of above-mentioned prior art problems point, 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 in the upper strata of raw material packing layer, packing into selectively to the iron ore of the kind of the liquation superior permeability of micro mist portion, 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 under the situation that sinter quality such as being reduced property reduces, improve the 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 being adopted
The inventor etc. are to being used for improving manufacturing at agglomerate and being formed at the yield rate on upper strata of the raw material packing layer in the pallet and the method for intensity having been carried out research with keen determination.
Consequently, confirm: in the iron ore of the many kinds that constitute raw materials for sintering, the 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 the iron ore powder is formed on the pallet for the iron ore more than the 4.0mm is encased in selectively.
In addition, according to this method, learn the method that increases with the solid fuel or the FeO source on the upper strata that makes the raw material packing layer that proposed in the past or the method for the easy meltbility iron ore of packing on the upper strata of raw material packing layer is compared, can generate the over-drastic liquation on the upper strata that does not make the raw material packing layer, not make under the situation that the air permeability of raw material packing layer integral body reduces, improve the 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 finishes, 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 cooperates and as raw materials for sintering, these raw materials for sintering are mixed, after the granulation, be encased in the manufacture method of the agglomerate that burns till on the pallet, liquation penetration distance based on described iron ore by described each kind mensuration, will be from the described iron ore of described many kinds reach mode more than the 4.0mm with the weighted mean of described liquation penetration distance and select or cooperate 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 the 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 the described described upper strata and the described lower floor of returning mine and being encased in described raw material packing layer.
(2) in 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 the 0.6 quality %.
(3) in manufacture method according to above-mentioned (1) described agglomerate, except that described high liquation perviousness iron ore, also the oxide skin that produces in the ironmaking operation 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 manufacture method according to above-mentioned (1) described agglomerate, also can be in the described upper strata and the described lower floor of described raw material packing layer, with identical cooperation 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 cooperation ratio on described upper strata also can be smaller or equal to the cooperation ratio of described lower floor.
(6) in 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 the described upper strata and the described lower floor of described raw material packing layer.
(7) in manufacture method according to above-mentioned (6) described agglomerate, the described oxide skin that produces in described ironmaking operation cooperates 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 the kind iron ore that is engaged in the raw materials for sintering is estimated to the liquation perviousness of micro mist portion, 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 portion is by being encased in the upper strata of raw material packing layer selectively, can improve the yield rate and the intensity on the upper strata of raw material packing layer, improve the productivity of agglomerate.
Description of drawings
Fig. 1 is the figure of expression from the microscope tissue in the simulation particle cross section of the raw materials for sintering of the raw material packing layer collection of sinter machine.
Fig. 2 is the figure of relation of the strength S I of expression liquation penetration distance of iron ore and the agglomerate in the real machine sintering operation.
Fig. 3 is the figure of relation of the yield rate of expression liquation penetration distance of iron ore and the agglomerate in the real machine sintering operation.
Fig. 4 is the figure that locates of the liquation penetration distance in the tablet of expression after burning till.
Fig. 5 is the figure of comparison of liquation penetration distance of the iron ore of expression principal item.
Fig. 6 is the figure of the relation of the intensity index of being measured by shatter test (+0.5mm% value) in expression liquation penetration distance of iron ore and the tablet firing test.
Fig. 7 is pack into the figure of relation of strength S I of the agglomerate in the test of bed thickness ratio and sintering pot of expression top.
Fig. 8 is pack into the figure of relation of yield rate of the agglomerate in the test of bed thickness ratio and sintering pot of expression top.
Fig. 9 is the liquation penetration distance and the Al of expression iron ore
2O
3The figure of the relation of containing ratio.
Figure 10 is the figure of the relation of the yield rate of the agglomerate in the test of Wingdale ratio and sintering pot in the expression upper strata.
Figure 11 is the figure of the relation of the strength S I of the agglomerate in the test of Wingdale ratio and sintering pot in the expression upper strata.
Figure 12 is the figure of loaded condition of raw materials for sintering of the sintering pot test of expression embodiment.
To be expression be respectively charged into the figure of an example of the method for the upper strata of raw material packing layer and lower floor with high liquation perviousness iron ore and other iron ore to Figure 13.
Embodiment
At first, technological thought of the present invention is described.
Fig. 1 is the figure of expression from the opticmicroscope tissue in the simulation particle cross section of the raw materials for sintering of the raw material packing layer collection 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 the powder portion of adhering to (micro mist portion) of the simulation particle of raw materials for sintering (constituting), iron ore (Fe by the nuclear particle more than the particle diameter 1mm and the powder portion of adhering to below the particle diameter 0.5mm around it
2O
3) and Wingdale (CaO) distribute brokenly, so their the contact part few.
Can think that thus in the sintering process of reality, sintering reaction is undertaken by the following stated.Promptly at the iron ore (Fe in the powder portion 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 permeates in adhering to powder portion, contacts with on every side iron ore or auxiliary material, assimilates repeatedly, zoarium.So increase the liquation amount, form agglomerate in conjunction with phase.
Have again, the inventor etc. have understood behavior that the initial stage liquation that generates permeates, have been the mineralogical character that the liquation perviousness depends on iron ore in the iron ore packing layer in sintering process, 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 the sintering operation reduces easily, 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 portion, thereby promote that anabolic reaction is effective.
The present invention is based on this technological thought and finishes, 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 cooperate 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 the pallet, it has following feature.Promptly, 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 the 4.0mm and select or cooperate the iron ore that constitutes by more than a kind, then to be enclosed in the upper strata 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) apart from the upper surface that is formed at the raw material packing layer on the above-mentioned pallet with the liquation penetration distance.
In the present invention, for solution perviousness of iron ore (the initial stage liquation is the easy diffustivity during infiltration in the iron ore powder below the 0.5mm to particle diameter) and liquation penetration distance (penetration distance of the liquation in the 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 cooperates 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, be combined with in employing under the situation of iron ore of two or more kinds, also this weighted mean shown as the liquation penetration distance.Have again, also can cooperate 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 among 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, the size 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 or shape, test sequence wait and estimate, then the liquation penetration distance in the conversion cost invention.In addition, for example, also can be by measuring the penetration time of liquation in 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 among the present invention is just passable.
The liquation perviousness evaluation test of the iron ore among the present invention is undertaken by following main points, measures the liquation penetration distance.
As the iron ore sample, the ratio that with the particle diameter is 0.25mm～0.5mm is that 50 weight % and particle diameter are that ratio below the 0.25mm is that the mode of 50 weight % is carried out the granularity adjustment, and thorough mixing.Then, adopting metal die shaping overflow mould, is that 4MPa forms the iron ore sample with the compacting pressure, and the manufacturing diameter is that 15mm, height are the iron ore tablet of 5mm (voidage (ventilate rate) of utilizing mercury penetration method to record is about 30%).
On the other hand, reach with initial stage liquation material and approach CaO-Fe
2O
3CaO:26 quality %, the Fe of eutectic composition of binary constitutional diagram
2O
3: the mode of the composition of 74 quality % cooperates 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, be that 4MPa forms initial stage liquation material with the compacting pressure, 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 the 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 promptly survey penetration distance in (2) and (4) this 3 place, obtain the liquation penetration distance from their mean value 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).
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 ℃, immediately tablet taken out the outer air cooling of stove then from 1290 ℃ with 3 minutes.
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 sinter cake (piece) fall 5 times by the height from 2m and measure.The yield rate of this agglomerate is represented the quality (kg) with respect to the sinter cake (piece) (wherein removing shop fixtures ore deposit part) before falling, and the particle diameter after falling is the ratio (quality %) of the quality (kg) of the above agglomerate (wherein removing shop fixtures ore deposit part) of 5mm.
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, then the yield rate of agglomerate and SI improve.
That is to say, the The above results teaching goes out: as the infiltrative index of the liquation of iron ore, adjust the method for cooperation of each kind of the iron ore in the raw materials for sintering based on the liquation penetration distance, utilizing the 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 promptly measuring in the evaluation test of liquation perviousness describes.
The liquation penetration distance of measuring in the chemical ingredients composition of the iron ore of the principal item that cooperates in the raw materials for sintering shown in the table 1 and the evaluation test of liquation perviousness.
[table 1]
In the table 1, B (a) and two kinds of Brazil of B (b) expression produce ore, and hematite ore is produced in H (a) and two kinds of Australia of H (b) expression, and Marra Mamba ore is produced in M (a) and two kinds of Australia of M (b) expression.High Rock Phosphate (72Min BPL) is produced in two kinds of Australia of HP (a) and HP (b) expression, and the peastone ores are produced in P (a) and two kinds of Australia of P (b) expression, and HPM represents that Australia produces novel mixed ore, and I (a) and two kinds of India of I (b) expression produce ores.In addition, S1 and S2 are illustrated in the oxide skin that produces in two kinds of ironmaking operations.
Fig. 5 is the figure of comparison of liquation penetration distance of the iron ore of the principal item shown in the expression 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 the 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 the 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) above 2.0mm and be lower than the scope of 4.0mm.
Have, the crystal water content height of peastone ore P (a) and P (b) is produced in Australia again, and assimilation fusion easily is 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 oxide skin S1 that produces in the ironmaking operation 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 the table 1 is pulverized, the iron ore of adjusting to particle diameter and be 0.25～0.25mm contains 50 weight % and particle diameter is the granularity that the following iron ore of 0.25mm contains 50 weight %, in these various iron ores, mix the Wingdale below the 0.25mm, 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 electric furnace, in air draught, burn till in the Ni rounding tubular crucible of 15mm with the sample tablet internal diameter of packing into.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 ℃, immediately tablet taken out the outer air cooling of stove then from 1290 ℃ with 3 minutes.
In the intensity evaluation of burning till tablet after burning till, burn till iron counterweight that tablet makes 300g to one and fall 3 times shatter test.Behind the sample (burning till tablet) after having mixed this test, use the 0.5mm screen sizing.As intensity index (+0.5mm% value), obtain 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 the strength S I that makes in the real machine sintering operation in advance 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 and test with the identical shape of tablet, be that diameter is that 8mm, height are the sample of the plate shape of 10mm with pot.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 the intensity and the yield rate of agglomerate good.
The relation of the liquation penetration distance of each the 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.
For having the liquation penetration distance is the infiltrative iron ore kind of liquation more than the 4.0mm, and routine particularly Brazil that lists as shown in table 1 produces ore B (a) and B (b).
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 constituted 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 the 4.0mm, adjust the cooperation ratio of the iron ore of two or more kinds.
In the following, with mode more than the 4.0mm is selected or the iron ore by constituting more than a kind that cooperates 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 with respect to the sinter quality (kg) before falling the particle diameter after falling is the ratio (quality %) of the above sinter quality (kg) of 5mm.
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 is represented the quality (kg) with respect to the sinter cake (piece) (wherein removing shop fixtures ore deposit part) before falling, and the particle diameter after falling is the ratio (quality %) of the quality (kg) of the above agglomerate (wherein removing shop fixtures ore deposit part) of 5mm.
Have, Fig. 7 and Fig. 8 are illustrated in the upper strata (A portion) and the lower floor (B portion) 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, cooperate Wingdale, coke and return mine by the mean value of upper strata (A portion) and lower floor (B portion), so that the SiO in the 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 use after with granulation water being 7.0 quality % granulations.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 with the strength S I of agglomerate be 77%, yield rate is 76% to be that benchmark is estimated.These metewands are under the situation of carrying out the real machine sintering operation, and the strength S I confirm agglomerate in advance is more than 90.5% by adopting, yield rate is the raw materials for sintering of the matching requirements shown in the table 2 more than 80.0%, carry out this sintering pot and test and 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 the 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 will packing into is defined as 5～12% scope.
The bed thickness ratio of packing on the top of the high liquation perviousness iron ore of packing into is lower than at 5% o'clock, 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 of packing on the top of the high liquation perviousness iron ore of packing into is higher than at 12% o'clock, 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 the sintering process, and the air permeability in the raw material packing layer reduces easily.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 that mode more than the 4.0mm is selected or the high liquation perviousness iron ore that cooperates is encased in the upper strata with the weighted mean of liquation penetration distance, 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, the upper strata and the lower floor of the solid fuel and the charging feedstock packing layer of returning mine.Have, only otherwise explanation especially in advance, auxiliary material, solid fuel and the cooperation ratio of returning mine are identical in the upper strata and the lower floor of raw material packing layer again.
In addition, except high liquation perviousness iron ore, oxide skin S1 that produces in the operation in ironmaking 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 cooperates 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 cooperates other iron ore and oxide skin as other iron-bearing material.
The 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 the 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 decision also is subjected to the influence of structure of the pore etc. of iron ore.But, if the Al in the iron ore
2O
3Containing ratio uprises, then the Al in the assimilation liquation of Sheng Chenging
2O
3Containing ratio also uprises.Therefore, the viscosity height of liquation, 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 the 0.6 quality %.
In addition, as previously mentioned,, need prevent that the liquation on the upper strata of raw material packing layer from excessively increasing in order to keep the air permeability of raw material packing layer integral body.In addition, for cutting down cost, preferably cut down auxiliary material.Therefore, investigated liquation and formed of the influence of needed auxiliary material, the particularly Wingdale ratio in the upper strata 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 cooperation ratio raw materials for sintering shown in the table 2.
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 cooperation ratio of the auxiliary material on preferred upper strata is below the cooperation 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 the pallet and raw material packing layer, for example can adopt method shown in Figure 13.
Below attraction type sinter machine give ore deposit portion, 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 the pallet 4 by other iron-bearing material and Wingdale, coke except that high liquation perviousness iron-bearing material and the raw materials for sintering 3 that constitutes 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 constituting, can in above-mentioned lower floor 5, form the upper strata 7 of raw material packing layer from the 2nd buffering bucket 2.
Have again; will be by high liquation perviousness iron-bearing material and Wingdale, coke and the raw materials for sintering 6 that constitutes and of returning mine by other iron-bearing material and Wingdale, coke and the raw materials for sintering 3 of returning mine and constituting; these two kinds of raw materials for sintering adopt respectively that 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 constituting, and by other iron-bearing material and Wingdale, coke and the raw materials for sintering 3 of returning mine and constituting, these two kinds of raw materials for sintering as mentioned above, with Wingdale, coke and the mode of the cooperation ratio that reaches regulation of returning mine cooperate.
[first embodiment]
Below, with embodiment effect of the present invention is described.
As raw materials for sintering, the average matching requirements when operating with the real machine shown in the table 2 is a benchmark, adopts high 600mm shown in Figure 12, the sintering pot of diameter 300mm, implements the sintering pot test.
[table 2]
Have again, carry out under the situation of real machine sintering operation, confirm to obtain strength S I in advance and be more than 90.5%, yield rate is the agglomerate more than 80.0% at the raw materials for sintering of the matching requirements shown in the employing table 2.
In addition, to yield rate, cold strength SI, the index of anti-reduction degradation RDI of the productivity in the 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 is represented with pot area (m again
2) and sintering time (my god) be the value that the quality (t) of the agglomerate more than the 5mm draws divided by particle diameter except that 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 is represented the quality (kg) with respect to the sinter cake (piece) (wherein removing shop fixtures ore deposit part) before falling, and the particle diameter after falling is the ratio (quality %) of the quality (kg) of the above agglomerate (wherein removing shop fixtures ore deposit part) of 5mm.
The index of anti-reduction degradation of agglomerate (RDI) is measured according to the test method of regulation among the JIS M 8720.That is to say that gathering particle diameter is the agglomerate 500g of 15～19mm, at N
2: 70%, in the mixed gas of CO:30%, reduced 30 minutes down at 550 ℃.Then, with the reductive agglomerate cylinder of packing into, carry out 30 minutes 900 times whirl test.With respect to the quality (g) of agglomerate after the reduction before the 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 among the JIS M 8713.That is to say that gathering particle diameter is the agglomerate 500g of 19～21mm, at N
2: 70%, in the mixed gas of CO:30%, reduced 180 minutes down at 900 ℃.With respect to oxygen containing quality (g) in the ferric oxide of the agglomerate before the 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 portion of packing into shown in Figure 12 then (upper strata of raw material packing layer).Have, Wingdale, coke and the cooperation ratio of returning mine are identical with cooperation ratio in the 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 portion of packing into shown in Figure 12 then (lower floor of raw material packing layer).The A portion of raw materials for sintering packing layer and the coke in the B portion 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 portion be two kinds of different Brazil of the liquation penetration distance shown in the table 1 produce ore B (a) and B (b), two kinds of different Australia of liquation penetration distance produce peastone ore P (a) and P (b), and the 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 in the ironmaking operation of liquation penetration distance.
In the present embodiment, from the grate face of pallet with the 530mm that packs into of B portion, in B portion with the bed thickness of 70mm (with respect to the bed thickness ratio of total bed thickness (600mm): the A portion of packing into 11.7%).
In addition, the SiO in the cooperation raw material of regulation A portion and B portion
2Be 5.01 quality %, CaO/SiO
2Be 1.89, coke cooperates 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 the table 3 is the mean value of n=2 time measured value.
Reference example 1 is to fill packed into the equably basic test of the many kinds iron ore shown in the table 2 of bed thickness direction as raw materials for sintering.The evaluation of the strength S I of the embodiment shown below and the agglomerate of comparative example, yield rate, productivity etc. is that benchmark is estimated with reference example 1.
In embodiment 1 and embodiment 2, compare with reference example 1, can not damage the RDI of anti-the reduction degradation and be reduced under the situation of rate JIS-RI, improve the yield rate and the strength S I of agglomerate, boost productivity.
In the A of embodiment 3 portion, the liquation penetration distance of the mixture of the iron ore of 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, can not damage the RDI of anti-the reduction degradation and be reduced under the situation of rate JIS-RI, improve the yield rate and the strength S I of agglomerate, boost productivity with reference example 1.
The liquation penetration distance of the mixture of the B (a) of the A portion 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, can not damage the RDI of anti-the reduction degradation and be reduced under the situation of rate JIS-RI, improve the yield rate and the strength S I of agglomerate, boost productivity with reference example 1.
In addition, the liquation penetration distance of the mixture of the iron ore of the B (a) of the A portion 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, can not damage the RDI of anti-the reduction degradation and be reduced under the situation of rate JIS-RI, improve the yield rate and the strength S I of agglomerate, boost productivity with reference example 1.
On the other hand, comparative example 1 is to be that to produce ore B (b) and liquation penetration distance be that peastone ore P (b) mixing is produced to reach ratio of mixture P (b): B (b)=45: 55 in Australia of 1.23mm for Brazil of 4.22mm with the liquation penetration distance shown in the table 1, and the A portion of packing into selectively, with pack into the example of B portion of remaining iron-bearing material.
The liquation penetration distance of the mixture of the B (b) of the A portion 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 to be that peastone ore P (a) the A portion of packing into is selectively produced in Australia of 1.12mm with the liquation penetration distance shown in the table 1, with pack into the example of B portion of remaining iron-bearing material.
Comparative example 3 is to be that peastone ore P (b) the A portion of packing into is selectively produced in Australia of 1.23mm with the liquation penetration distance shown in the table 1, with pack into the example of B portion of remaining iron-bearing material.
In comparative example 2 and comparative example 3, the liquation penetration distance of the P (a) of the A portion of packing into selectively and the iron ore of P (b) is all low respectively to 1.12mm and 1.23mm.Therefore, compare with reference example 1, the yield rate of agglomerate and strength S I reduce, and productivity also reduces.
[second embodiment]
Then, under the condition identical with the embodiment that implements by [first embodiment] 1, promptly pack into the bed thickness ratio (from the bed thickness ratio with respect to total bed thickness of upper surface) in the top of producing ore B (a) except that Brazil of the A portion of packing into (upper strata of raw material packing layer), in identical condition, only change the top bed thickness ratio of packing into, similarly test.Have, reference example 1 is the identical condition of condition with [first embodiment] again.
In addition, with [first embodiment] similarly, the yield rate and the cold strength SI of the productivity in the sintering pot test, the agglomerate that obtains measured.It 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 portion of mode that the bed thickness ratio reaches 5～12% scope that packs into, compare with reference example 1, do not damaging the RDI of anti-the reduction degradation and be reduced under the situation of rate JIS-RI, improve the yield rate and the strength S I of agglomerate, improved productivity.
On the other hand, reach pack into the comparative example 1 and 2 and Brazil produced ore B (a) the bed thickness ratio of packing into top and reach in the comparative example 3 and 4 of the A portion of packing into greater than the mode of 12% scope of A portion of the mode that is lower than 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 sintering deposit of attraction type sintering machine, by the iron ore that is engaged in each kind in the raw materials for sintering is estimated to the liquation permeability 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 packed layer, and can improve thus yield rate and the intensity on the upper strata of raw material packed layer, improve the productivity ratio of sintering deposit. Thereby, the utilizability height of the present invention in steel industry.
Symbol description
1 the 1st buffering bucket (other iron-bearing material is used)
2 the 2nd buffering buckets (high liquation permeability 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 packed layers
6 by high liquation permeability 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 packed layers
8 comminutors
9 comminutors
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 cooperate 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 the pallet, it is characterized in that
Liquation penetration distance based on described iron ore by described each kind mensuration, will be from the described iron ore of described many kinds reach mode more than the 4.0mm with the weighted mean of described liquation penetration distance and select or cooperate 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 the 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 the 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 the 0.6 quality %.
3. the manufacture method of agglomerate according to claim 1, it is characterized in that, except that described high liquation perviousness iron ore, the oxide skin that produces in the ironmaking operation 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 the described upper strata and the described lower floor of described raw material packing layer, with identical cooperation 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 the described raw material packing layer, the cooperation ratio on described upper strata is smaller or equal to the cooperation 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 the described upper strata and the described lower floor of described raw material packing layer.
7. the manufacture method of agglomerate according to claim 6, it is characterized in that, the described oxide skin that produces in described ironmaking operation cooperates 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 true CN102159733A (en) | 2011-08-17 |
| CN102159733B CN102159733B (en) | 2013-05-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009801361127A Expired - Fee Related CN102159733B (en) | 2008-09-17 | 2009-09-17 | Sintered ore manufacturing method |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP4528362B2 (en) |
| KR (1) | KR101204525B1 (en) |
| CN (1) | CN102159733B (en) |
| BR (1) | BRPI0918512B1 (en) |
| WO (1) | WO2010032466A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103215442A (en) * | 2013-04-27 | 2013-07-24 | 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 |
| TWI820935B (en) * | 2021-09-29 | 2023-11-01 | 日商日本製鐵股份有限公司 | Iron making method |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5703616B2 (en) * | 2010-07-16 | 2015-04-22 | 新日鐵住金株式会社 | Method for producing sintered ore |
| KR102043781B1 (en) * | 2017-12-26 | 2019-12-02 | 주식회사 포스코 | Method and apparatus for manufacturing sintered ores |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58153737A (en) * | 1982-03-06 | 1983-09-12 | Nippon Steel Corp | Method for making sintered ore |
| JPS62130227A (en) * | 1985-12-03 | 1987-06-12 | Kawasaki Steel Corp | Method for sintering fine ore |
| JPS62130229A (en) * | 1985-12-02 | 1987-06-12 | Sumitomo Metal Ind Ltd | Sintering operation method |
| 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 |
| 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 | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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
- 2009-09-17 KR KR1020117005893A patent/KR101204525B1/en active IP Right Grant
- 2009-09-17 JP JP2010504356A patent/JP4528362B2/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58153737A (en) * | 1982-03-06 | 1983-09-12 | Nippon Steel Corp | Method for making sintered ore |
| 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 |
| 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103215442A (en) * | 2013-04-27 | 2013-07-24 | 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 |
| TWI820935B (en) * | 2021-09-29 | 2023-11-01 | 日商日本製鐵股份有限公司 | Iron making method |
Also Published As
| Publication number | Publication date |
|---|---|
| BRPI0918512A2 (en) | 2015-12-01 |
| BRPI0918512B1 (en) | 2017-11-21 |
| CN102159733B (en) | 2013-05-15 |
| 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 |
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