CN104313308B - Iron ore low-carbon sintering method - Google Patents

Iron ore low-carbon sintering method Download PDF

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CN104313308B
CN104313308B CN201410674368.6A CN201410674368A CN104313308B CN 104313308 B CN104313308 B CN 104313308B CN 201410674368 A CN201410674368 A CN 201410674368A CN 104313308 B CN104313308 B CN 104313308B
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iron ore
sintering
sintering method
low charcoal
heat
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CN104313308A (en
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蒋大均
宋剑
何木光
杜斯宏
何斌
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Pangang Group Panzhihua Steel and Vanadium Co Ltd
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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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Abstract

The invention belongs to the field of steel smelting, and particularly relates to an iron ore low-carbon sintering method which is low in sintering energy consumption. According to the technical scheme, the iron ore low-carbon sintering method includes the steps that iron ore, fuel and a fluxing agent are distributed and mixed to form a mixture for sintering, wherein magnetite in the iron ore is not smaller than 50% by mass, non-magnetite m1 is greater than 0 but smaller than or equal to 40%, metallurgy waste m2 is greater than or equal to 0 but smaller than or equal to 10%, the non-magnetite is at least one of hematite, limonite and siderite, and the metallurgy waste is iron waste mainly composed of Fe and FeO. According to the method, raw material constitutes of the mixture and technical parameters are adjusted, so that non-carbon heat input is increased, carbon content is reduced, and sintering energy consumption is reduced.

Description

Iron ore low charcoal sintering method
Technical field
The invention belongs to field of iron and steel smelting, be specifically related to a kind of iron ore low charcoal sintering method.
Background technology
Sintering is the most important process of iron mineral powder agglomeration.The result of sintering is to bond between powder particle, burns The intensity of knot body increases, and the aggregation of powder particle is turned into the agglomerate of crystal grain, thus physics needed for obtaining, machinery, The agglomeration product of metallurgical performance, for blast furnace ironmaking.
Iron and steel enterprise is as coal consumption rich and influential family, and sintering circuit energy consumption accounts for the 10%～15% of total energy consumption, is only second to refining Ferrum, occupies second.Wherein sintering solid fuel consumption accounts for the 75%～80% of process energy consumption, reduces sintering circuit energy consumption first To set about solid fuel consumption from reducing.
The heat income of sintering process has: the chemical heat of coal gas and physical thermal, the physical thermal of igniting combustion supporting wind, solid fuel The chemical heat of burning, returns the chemical heat of material, and the chemistry of compound, grate-layer material and the physical thermal of sintering air and sintering process is anti- Should heat.The heat expenditure of sintering process: compound mechanical water evaporation heat dissipation, water of constitution, limestone and ore decomposition heat dissipation, sintering deposit Physical thermal and other heat loss.
Understand with test according to thermally equilibrated calculating, in typical sintering machine thermal balance, heat income item solid fuel heat Accounting for the 70～85% of sintering process total amount of heat, igniting heat consumption only accounts for 15～30% with other heat income；In heat expenditure item, sintering deposit Physical thermal accounts for about 50%, and flue gas is taken away heat and accounted for about 25%, and carbonate, moisture etc. are decomposition heat accounts for about 20%.Thus may be used Seeing, solid burnup combustion chemistry heat accounts for absolute specific gravity and the status of heat income, in the condition meeting sintering process requirement heat Under, its fuel saved of solid fuel ignition heat reduction by 1% is also considerable with cost.
Low charcoal sintering seeks to reduce the charcoal amount of joining of sinter mixture, reduces mineral charcoal burning CO2Discharge capacity, but can't Needed for impact sinters the heat in ore deposit into.Realize the two lines of low charcoal sintering: one is to increase non-charcoal heat income, and two is to reduce heat Expenditure item proportion.
State is externally sintered begins to focus on energy-saving and emission-reduction as far back as the eighties, and Japan is due to shortage of resources, in terms of low charcoal sintering Marching at the forefront of the world, solid burnup is generally 25～40 kilograms of standard coal/tons, i.e. kgce/t, than China general low 10～ 20kgce/t, China's sintering solid burnup advanced level also reaches about 35kgce/t.
Climb steel sintering solid burnup and be in backward level at home, reach 50kgce/t, from internal longitudinal comparison, be also at Rise situation.Although passing through in recent years is sintering technology upgrading, but solid burnup does not only drop, and raises on the contrary, as fall The important channel that lower energy cost is increased economic efficiency, reduction solid burnup realizes low charcoal sintering and has important practical significance.
Summary of the invention
High for China's iron ore sintering solid burnup, the technical problem that the effective heat utilization efficiency of sintering machine is low, the present invention carries For the iron ore low charcoal sintering method that a kind of sintering energy consumption is low.
For solving above-mentioned technical problem, the technical solution adopted in the present invention is:
Iron ore low charcoal sintering method, including iron ore, fuel, flux are first passed through dispensing, mix after compound again Be sintered, wherein: described iron ore by quality ratio, including magnetic iron ore >=50%, non-magnetic iron ore≤40%, metallurgical waste≤ 10%；
Wherein, described non-magnetic iron ore is at least one in bloodstone, limonite, siderite；
The main chemical compositions of described metallurgical waste is at least one in Fe, FeO.
Due to magnetic iron ore in sintering method of the present invention, return mine, metallurgical waste all contains at least one in FeO, Fe, magnetic In iron mine, FeO content reaches 20%～30%, and FeO, Fe oxidation reaction belongs to exothermic reaction.Theoretical Calculation 1kg FeO oxidation is put Heat is equivalent to 0.068kg coke powder or 0.09kg anthracite；1kg Fe oxidation heat liberation be equivalent to 0.264kg coke powder or 0.335kg without Bituminous coal.Therefore, add magnetic iron ore, return mine, metallurgical waste can increase non-carbon heat income, reduce mixed carbon comtent, make sintering energy Consumption is minimized.
Metallurgical waste specifically can be selected for ferrous alloy powder, mill scale, scum, steel-making dust, steel-smelting sewage sludge, slag, desulfurization slag, slag In ferrum, steel rolling chip, precipitating sludge, gas ash, gas mud, equal slag, tailings, blast furnace ash, power gas, dedusting ash at least one Kind.
In technique scheme, in dispensing, blend step, by weight percentage, fuel 1%～7%, flux 1%～ 15%, remaining is iron ore.
For reclaiming waste heat of returning mine, improve material structure, improve resource utilization, can be at compound iron ore, fuel, flux After, adding compound of returning mine to obtain, the addition returned mine is the 0～50% of mixture quality；Addition of returning mine is mixture quality When 30%, best results.
In technique scheme, for reducing sintering energy consumption, preferably control compound fixed carbon content≤2.6%.
In technique scheme, for reducing sintering fusing point, energy efficient, preferably control compound Al2O3/SiO2Mass ratio is 0.3～0.5.
In technique scheme, described flux selects grog flux can save decomposition heat.Preferably quick lime, active lime or At least one in high magnesium ash.Described high magnesium ash is the quick lime containing MgO 20%～50%.
In gas ash, gas mud, fixed carbon content is 15%～20%.In technique scheme by quality ratio, metallurgical useless In material, 20%～50% is at least one in gas ash, gas mud, can save fossil fuel.Gas ash is in blast furnace ironmaking mistake Cheng Zhong, the fine dust being entrained in blast furnace gas, through dry dust removal gained dry type grain dust, through the product of wet dust removal gained Thing is gas mud through precipitation.
In technique scheme, preferably controlling mixture moisture is 6.0%～7.5%, can reduce moisture evaporation physical thermal.
In technique scheme, for improving efficiency of combustion and the heat utilization efficiency of fuel, preferably control less than 10% grain in fuel Degree>3mm, less than 15% granularity<0.5mm in fuel.
For utilizing bed of material auto accumulation heat effect, improving heat utilization ratio, present invention sintering preferably uses deep-bed sintering, the bed of material Thickness >=600mm, for guaranteeing to sinter efficiency, preferred 800mm～1000mm of thickness of feed layer.
In technique scheme, before sintering, mixture temperature is risen to more than 60 DEG C, the physical thermal of compound can be increased, with Time eliminate sintered wet layer harm, for energy efficient purpose, preferably compound is warming up to 80 DEG C.
In technique scheme, for improving sinter strength and metallurgical performance, preferably control sintering temperature be 1250 DEG C～ 1280℃。
In technique scheme, for reducing heat loss, preferably controlling flue-gas temperature is 90 DEG C～150 DEG C.
In technique scheme, joining charcoal for reducing, reduce sintering burnup cost, preferably controlling sintering gained sintering mine FeO is 5%～8%.
After sintering, the sintering deposit of granularity ＜ 5mm is participated in next group sintered material as returning charge, waste heat of returning mine can be reclaimed, Improve material structure, and improve resource utilization.
Power gas of the present invention is the gas ash that dynamics factory cleans that coal gas obtains.
Dedusting ash of the present invention is the dust that sintering environment cleaner unit is collected, and chemical composition is close with sintering deposit.
Beyond unless otherwise indicated, in the present invention, ratio, content, composition etc. are mass percent.
Beneficial effects of the present invention is as follows:
1, the inventive method forms by adjusting the raw material in compound, adds non-carbon heat income, reduces and join carbon Amount, makes sintering energy consumption be minimized.
2, by adjusting control compound Al2O3/SiO2Mass ratio, makes compound fusing point be minimized, it is achieved that low temperature burns Knot.
3, the inventive method can use the metallurgical industrial waste such as iron-containing waste, gas ash, has reached waste reclaimation Purpose, has saved cost, has alleviated ambient pressure.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention is further described.
1, rational Ore kind and matching structure are used.Nature has magnetic iron ore, bloodstone, limonite, sparring at present The big class in ore deposit four, except magnetic iron ore contains higher FeO, sintering reaction is outside exothermic reaction, and in other Ore, FeO is the lowest or does not contains FeO, sintering reaction is the endothermic reaction.But, depending on Ore formation condition, nature also has the composite ore of above-mentioned Ore.
Magnetic iron ore contains FeO 20%～30%, and high through oversintering rear oxidation degree, in magnetic iron ore, FeO exists in sintering process Oxidation reaction is released substantial amounts of heat, sintering can be reduced and join charcoal amount.Magnetic iron ore FeO oxidation heat liberation is as follows:
FeO+1/4O2=1/2Fe2O3+284.57829/2(KJ/mol)
Theoretical Calculation understands, and 1kg FeO oxidation heat liberation is equivalent to 0.068kg coke powder or 0.09kg anthracite.Inventor is real Issuing after examination and approval existing, be >=50% by magnetic iron ore proportioning, non-magnetic iron ore proportioning is≤40%, metallurgical waste≤10%, can improve oxidation anti- Answer exothermal effect.
2, iron containing metallurgical waste material is added.Any iron and steel enterprise inevitably produce iron sheet, scum, steel-smelting sewage sludge, slag, The metallurgical wastes such as desulfurization slag, slag ferrum, steel rolling chip, precipitating sludge, these iron containing metallurgical waste material main features one are containing metal Ferrum or FeO, mainly comprising of partial metallurgical waste material refers to table 1, oxidation reaction in sintering process, releases amount of heat；Two are Containing ripe property CaO, decomposition of limestone heat dissipation during sintering, can be saved, reduce and join charcoal amount.
Metallic iron oxidation heat liberation:
Fe+3/4O2=1/2Fe2O3+823.45792/2(KJ/mol)
Theoretical Calculation 1kg Fe oxidation heat liberation is equivalent to 0.264kg coke powder or 0.335kg anthracite, every 200kg metallic iron Oxidation heat liberation can meet 1 ton of sintering deposit and sinter institute's calorific requirement, is not required to addition of fuel.
Table 1 main metallurgical waste chemistry composition (%)
Title FeO SiO2 CaO MgO Al2O3 V2O5 TiO2 S Ig P Fe2O3
Gas ash 9.79 7.23 6.77 4.38 2.95 0.356 4.6 0.314 18.34 0.101 42.69
Blast furnace ash 8.64 7.27 7.84 6.14 2.45 0.322 4.33 0.31 17.96 0.042 42.22
Iron sheet 56.9 3.52 0.4 0.88 1.16 0.181 0.24 0.075 0 0.022 34.30
Ferrous alloy powder 48.83 5.43 9.01 3.88 1.46 0.15 0.95 0.084 6.94 0.084 21.98
All slags 39.18 20.65 3.37 3.38 4.94 0 0 0 1.63 0.076 25.14
Ferrous alloy powder 43.47 5.32 8.52 3.54 1.65 0.3 2.24 0.128 7.85 0.042 26.00
Slag 4.86 11.1 34.94 3.88 3.88 1.96 2.65 0.22 11.6 0.223 21.46
Tailings 62.061 5.1058 16.105 2.81 1.9792 0.2593 1.9067 0.411 0 0.0424 13.02
Steel-smelting sewage sludge 90.81 2.76 2.78 0 0 2.61 0.52 0.515 0 0 0
Note: gas ash contains fixed carbon 18.21%, blast furnace ash contains fixed carbon 17.05%.
3, reduce sintering mine FeO, reduce and join charcoal.
FeO in sintering deposit is mainly derived from raw material and generates with sintering reaction.FeO in raw material occurs in sintering reaction Oxidation reaction, as in raw material, FeO is higher than sintering mine FeO, then sintering process overall control is in oxidizing atmosphere, then C burning is raw The trend becoming CO is suppressed, and joins charcoal amount and necessarily reduces；As in raw material, FeO content is less than sintering mine FeO, then sintering atmosphere is by CO Reproducibility controls, and C burning is the essential condition producing CO, therefore joins charcoal amount and necessarily increases.It was verified that FeO in sintering deposit Content and solid fuel consumption amount are near linear elevational relationship, and control FeO in Sinter just can reduce joins charcoal amount.To burn Knot ore deposit FeO controls to reduce sintering burnup cost, improve metallurgy while ensureing Sintering Operation Index index 5%～8% Performance, improves middle temperature (900 DEG C) reduction degree.
4, use deep-bed sintering, increase bed of material auto accumulation heat effect, improve heat utilization ratio.
The sinter layer on sintering machine top is by cold air quick refrigeration, and crystallization degree is low, and nature of glass content is high, intensity difference, powder End is many.As increased thickness of feed layer, the ratio of upper strata intensity difference reduces the most relatively.The master of Increasing Production and Energy Saving is become for this deep-bed sintering Want means.When thickness of feed layer increases, thermal zone thickness increases accordingly, and sintering velocity slows down, and crystallizable mineral condition improves, high temperature dwell Holding time lengthening, intensity improves with yield rate.Inventor tests discovery, and when thickness of feed layer is 180mm～220mm, amount of stored heat accounts for The 35%～45% of combustion zone heat income, when the bed of material reaches 400mm, amount of stored heat reaches 55%～60%, therefore improves the bed of material Thickness can reduce firing rate, when guaranteeing that fuel burns completely, can improve fuel availability.Experiment shows, the bed of material often carries High 10mm, reduces solid burnup 0.5kg～1.0kg/t.Therefore, thickness of feed layer should be not less than 600mm, thickness of feed layer especially with 800m～1000mm is optimal.
5, fuel granularity controls.The combustion of fuel granularity<part of 0.5mm is enriched in bed of material top, granularity>3mm in sintering Material is enriched in material layer lower part, and bed of material top heat demand is many, and bottom heat demand is few.This requires complete phase with sintering thermal system Instead.Meanwhile, during burning, fuel granularity varies in size, and burning velocity is different, and heat transfer rate is the most different.Therefore, fuel selects to use up Amount reduces granularity ＞ 3mm and the fuel of granularity ＜ 0.5mm.
6, use grog flux, reduce carbonate decomposition heat.Sintering uses quick lime, active lime, high magnesium ash, can reduce Limestone, dolomite decomposition heat, reduce join charcoal amount.Decomposition of limestone:
CaCO3=CaO+CO2-177.7(KJ/mol)
Theoretical Calculation 1kg CaCO3Decompose heat absorption and be equivalent to 0.064kg coke powder or 0.081kg anthracite, use quick lime Or active lime substitutes limestone, can save a part of decomposition heat.
Additionally, quicklime slaking exothermic heat of reaction:
CaO+H2O=Ca (OH)2+64.90(KJ/mol)
Theoretical Calculation 1kg CaO digestion heat release is equivalent to 0.042kg coke powder or 0.053kg anthracite.Use 85%CaO calculogenesis Ash substitutes the limestone of 54% for sintering, and calculates by effective CaO, with 1kg quick lime alternative 1.64kg limestone, decomposition heat 0.140kg coke powder or 0.178kg anthracite is equivalent to digestion reaction heat release.Such as, production uses quick lime 65kg, theoretical Calculating can save coke powder 9.1kg, or saves anthracite 11.54kg, but it is not thorough to there is digestion in actual production, decomposes not exclusively And the factor such as heat loss, actual energy-saving effect is less than value of calculation.
Additionally, CaO content about 35% in slag, decomposition of limestone heat can also be saved for sintering.
Active lime is the one of quick lime, has that crystal is little, dispersion is high, activity degree is big, the digestion rate that adds water is fast, ripe Change degree high.Quick lime CaO content is generally 75%～85%, and activity degree is generally 180mL～230mL, and active The general CaO of Calx is up to 90%～96%, and activity degree is typically up to 300mL～350mL.Owing to active lime activity degree is high, by force Change effect is more higher than quick lime, and pellet performance improves, and can be that deep-bed sintering creates conditions；The active lime work to fuel combustion Change performance higher, burning velocity can be improved, and reduce decomposition of limestone heat；Can promote that liquid phase generates simultaneously, improve intensity and become Product rate.
Quicklime slaking exothermic heat of reaction, can improve mixture warm in preparing raw materials for sintering in theory with addition of 5% quick lime Spending more than 10 DEG C, actual effect can reach 3 DEG C～5 DEG C, and quick lime also can reduce carbonate decomposition heat after substituting limestone, therefore Quick lime has Intensified support and sintering, saves the multi-efficiency of solid burnup.
7, sintering process parameter controls.
(1) raising mixture warm is to more than 60 DEG C, can reduce excessive moistening layer impact.Specifically can use steam preheating, return mine pre- The conventional pre-heating means such as the preheating of heat, hot water, digestion preheating, hot-air pre-heating.
(2) controlling mixture moisture is 6.0%～7.5%, can reduce moisture evaporation physical thermal.The low water of deep-bed sintering, Excessive moistening layer harm and heat expenditure can be reduced.
(3) control to return mine ratio.During maintenance balance of returning mine, the ratio accounting for compound of returning mine is advisable with 0～50%, with 30% Most preferably, the optimum balance of productivity ratio and compound granularity can be reached simultaneously.Compound granularity is the thickest, and productivity ratio is the highest.Productivity ratio For productivity of sintering machine, unit t/m2H, represents the yield of the sintering deposit that every square metre of area produces within the unit interval.
(4) flue-gas temperature is controlled.In sintering thermal balance, waste gas band becomes popular and pays about 25% into total heat, reduces waste gas temperature Degree just can reduce heat to be pointed out, direct effect is the heat demand that can reduce and join charcoal.Flue-gas temperature being controlled can at 90 DEG C～150 DEG C Reducing heat expenditure, protection smoke extractor is from the impact of high temperature Yu low-temperature flue gas, flue-gas temperature too high generation thermal stress damage simultaneously Smoke extractor rotor, flue-gas temperature is too low, produces steam, and the wet mud of dust hangs over damage equipment on smoke extractor rotor.
8, fixed carbon controls.
Under conditions of 1～7 conditions possess, compound solid carbon is controlled below 2.6%, it is possible to decrease solid burnup 10%～20%, ensure sintering institute calorific requirement simultaneously, wherein most origin of heat burns in non-charcoal.Accordingly, sintering is controlled In ore deposit, FeO is 5%～8%, controls sintering temperature 1250 DEG C～1280 DEG C, can improve and reach sintering deposit mineral composition, improves strong Degree and the effect of metallurgical performance.Control Al2O3/SiO2Mass ratio is 0.3～0.5, can reduce sintering fusing point.Al2O3/SiO2Matter Amount ratio is too high, is unfavorable for energy-conservation and improves Sintering Operation Index, such as Al2O3/SiO2When mass ratio is 0.8, sintering temperature exceedes 1300 DEG C, more heat energy need to be additionally provided for reaching sintering temperature.
Use the inventive method can reduce joining charcoal and not affecting the main performance index of sintering deposit in sinter mixture, Needed for ensureing sintering heat, reach saving fuel and reduced CO2The purpose of discharge, it is achieved that low charcoal low cost sinters.
Below in conjunction with specific embodiment, the present invention is further described.
Embodiment 1
Laboratory test:
According to table 2 completes mixed material, parallel laboratory test 10 groups.Cloth, igniting, convulsion is carried out according to existing sintering process Sintering, heat crush, cool down, sieve the links such as granulate and be sintered.Sintering condition and sintering the results are shown in Table 3.
Table 2 laboratory low charcoal sintering main material proportioning (%)
Table 3 laboratory low charcoal sintering condition and sintering result
Test model synthetic techniques: using composite index law, for multiple indexs of a system, some indexs are the highest more good, It is referred to as high excellent index, the tumbler index of such as this test, usage factor etc.；Some indexs are the lowest more good, the lowest excellent index, example Such as solid burnup, low temperature reduction degradation index etc..Single index number p of high excellent index, discusses calculation, i.e. by measured value X and standard value M P=X/M；Single index number p of low excellent index, available standards value M and measured value X discuss calculation, i.e. p=M/X.Standard value is exactly The figure of merit, aggregative index, it is added again after i.e. single index number is multiplied by weights, weights are determined by expertise.For this test, focus on Index have yield rate, usage factor, tumbler index, solid burnup, find out their standard value, then calculate single index number p, meter Calculating aggregative index I, weight is assigned as 10:30:30:30, and the highest effect of aggregative index is the best.According to integrated evaluating method, weight Do not affect the sequence of test resultant effect.
Having manufactured 10 batches of sintering deposits in embodiment 1 altogether, from table 3, sintering deposit single index or comprehensive evaluation index are also Do not raise with fixed carbon content and improve.Fixed carbon content raises, and sintering heat is superfluous, have impact on yield and quality and comprehensive effect on the contrary Really.When raw materials for sintering is containing charcoal 2.16%, aggregative index is the highest, reaches 95.83, and when being 2.31% containing charcoal, resultant effect index For 93-94.06, it is deteriorated than containing charcoal 2.16%；When reaching 2.46% containing charcoal, aggregative index is 91.57-93.21, when containing When charcoal is 2.61%, aggregative index 92.15-92.50, it is seen that sintering heat enough under conditions of, along with joining the raising of charcoal amount, Sintering deposit aggregative index the most progressively declines, i.e. effect is progressively deteriorated, and illustrates in the case of condition possesses, and low charcoal sintering is feasible , and better.
Embodiment 2
260m2Sintering machine commerical test:
Complete dispensing according to proportioning in table 4 and mix, parallel laboratory test 7 groups.Cloth, point is carried out according to existing sintering process Fire, down draft sintering, heat crushes, cool down, sieve the steps such as granulate is sintered.Experimental result is shown in Table 5.
Table 4260m2Sintering machine low charcoal sintered material structure and proportioning (%)
In table 4, active lime 1 is containing CaO90%, and active lime 2 is containing CaO85%.
Table 5260m2Sintering machine low charcoal sintering commercial test results
At certain sintering plant 260m2Carry out the sintering commerical test of low charcoal on sintering machine, carry out 7 according to proportioning raw materials in table 4 Group experiment.Usage factor 35, solid burnup 35, the weight of tumbler index are assigned as 35:35:30.As can be seen from Table 5, along with Compound fixed carbon content increases, and the trend that FeO rises, solid burnup rises, aggregative index is progressively deteriorated occurs.Join charcoal When 2.40%, aggregative index is up to 99.45；Joining charcoal when reaching about 2.60%, aggregative index is down to about 96 on the contrary；And work as When joining charcoal 2.8%～2.9%, aggregative index is down to 93-95, and resultant effect is deteriorated.Use the present invention low charcoal sintering as can be seen here Resultant effect is more preferably.

Claims (13)

1. iron ore low charcoal sintering method, including iron ore, fuel, flux first passing through dispensing, mixing to enter after compound again Row sintering, it is characterised in that: in terms of mass fraction, magnetic iron ore content >=50% in described iron ore, non-magnetic iron ore content m1: 0 ＜ m1≤ 40%；Metallurgical waste content m2: 0≤m2≤ 10%；
Wherein, described non-magnetic iron ore is at least one in bloodstone, limonite, siderite；
Described metallurgical waste is ferrous alloy powder, mill scale, scum, steel-making dust, steel-smelting sewage sludge, slag, desulfurization slag, slag ferrum, steel rolling At least one in chip, precipitating sludge, gas ash, gas mud, equal slag, tailings, blast furnace ash, power gas, dedusting ash；
In described sintering process: control compound fixed carbon content≤2.6%；
Control compound Al2O3/SiO2Mass ratio is 0.3～0.5；
Control sintering temperature 1250 DEG C～1280 DEG C；
Controlling sintering gained FeO in Sinter is 5%～8%；
Controlling flue-gas temperature is 90 DEG C～150 DEG C.
Iron ore the most according to claim 1 low charcoal sintering method, it is characterised in that: described sintering step is sintered to thickness The bed of material sinters, thickness of feed layer >=600mm.
Iron ore the most according to claim 2 low charcoal sintering method, it is characterised in that: thickness of feed layer be 800mm～ 1000mm。
Iron ore the most according to claim 1 low charcoal sintering method, it is characterised in that: in described dispensing, blend step, press Percentage by weight meter, fuel 1%～7%, flux 1%～15%, remaining is iron ore.
Iron ore the most according to claim 1 low charcoal sintering method, it is characterised in that: by quality ratio, in metallurgical waste 20%～50% is at least one in gas ash, gas mud.
Iron ore the most according to claim 1 low charcoal sintering method, it is characterised in that: described flux is grog flux.
Iron ore the most according to claim 6 low charcoal sintering method, it is characterised in that: described flux is quick lime, Gao Mei At least one in ash, active lime.
Iron ore the most according to claim 1 low charcoal sintering method, it is characterised in that: less than 10% granularity in described fuel >3mm, less than 15% granularity<0.5mm in described fuel.
Iron ore the most according to claim 1 low charcoal sintering method, it is characterised in that: controlling compound water content is 6.0%～7.5%.
Iron ore the most according to claim 1 low charcoal sintering method, it is characterised in that: by mixture temperature liter before sintering To more than 60 DEG C.
11. iron ore according to claim 10 low charcoal sintering method, it is characterised in that: before Shao Jie, compound is warming up to 80℃。
12. according to the iron ore low charcoal sintering method described in any one of claim 1～11, it is characterised in that: after having sintered Using the sintering deposit of granularity ＜ 5mm as use of returning mine；The addition returned mine is the 0～50% of mixture quality.
13. according to the iron ore low charcoal sintering method described in any one of claim 12, it is characterised in that: the addition returned mine is The 30% of mixture quality.
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