CN104313308A - Iron ore low-carbon sintering method - Google Patents

Iron ore low-carbon sintering method Download PDF

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CN104313308A
CN104313308A CN201410674368.6A CN201410674368A CN104313308A CN 104313308 A CN104313308 A CN 104313308A CN 201410674368 A CN201410674368 A CN 201410674368A CN 104313308 A CN104313308 A CN 104313308A
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iron ore
sintering
sintering method
heat
low
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CN104313308B (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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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

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

The low charcoal sintering method of iron ore
Technical field
The invention belongs to field of iron and steel smelting, be specifically related to the low charcoal sintering method of a kind of iron ore.
Background technology
Sintering is the most important processing method of iron mineral powder agglomeration.The result of sintering bonds between powder particle, and the intensity of sintered compact increases, and the aggregate of powder particle is turned into the agglomerate of crystal grain, thus the agglomeration product of physics needed for acquisition, machinery, metallurgical performance, for blast furnace ironmaking.
Iron and steel enterprise is as coal consumption rich and influential family, and sintering plant revamp accounts for 10% ~ 15% of total energy consumption, is only second to ironmaking, occupies second.Wherein sintering solid fuel consumption accounts for 75% ~ 80% of process energy consumption, reduces sintering plant revamp and first will set about from reduction solid fuel consumption.
The heat income of sintering process has: the chemical heat of coal gas and physical thermal, the physical thermal of igniting combustion supporting wind, the chemical heat of solid fuel ignition, the chemical heat of returns, compound, grate-layer material and the sintering physical thermal of air and the chemical reaction heat of sintering process.The heat expenditure of sintering process: compound mechanical water evaporation heat dissipation, constitution water, Wingdale and ore decomposition heat dissipation, agglomerate physical thermal and other thermosteresis.
Known with test according to thermally equilibrated calculating, in typical sinter machine thermal equilibrium, heat income item solid fuel heat accounts for 70 ~ 85% of sintering process total heat, and igniting hear rate and other heat are taken in and only accounted for 15 ~ 30%; In heat expenditure item, agglomerate 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%.As can be seen here, solid burnup combustion chemistry heat account for heat income absolute specific gravity and status, under the condition meeting sintering process requirement heat, solid fuel ignition heat reduce by 1% its save fuel and cost be also considerable.
What low charcoal sintering will reduce sinter mixture exactly joins charcoal amount, reduces mineral charcoal burning CO 2quantity discharged, but can't affect sinter ore deposit into heat needed for.Realize the two lines of low charcoal sintering: one is increase non-charcoal heat income, two is reduce heat expenditure item proportion.
State is externally sintered just to start to focus on energy-saving and emission-reduction as far back as the eighties, Japan is due to shortage of resources, march at the forefront of the world in low charcoal sintering, solid burnup is generally 25 ~ 40 kilograms of standard coal/tons, i.e. kgce/t, low 10 ~ 20kgce/t more general than China, 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 inner longitudinal comparison, be also in rising situation.Although in recent years through being sintering technology upgrading, solid burnup did not only fall, and raises on the contrary, as the important channel that reduction 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 sinter machine net heat utilization ratio is low, the invention provides the low charcoal sintering method of the low iron ore of a kind of sintering energy consumption.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is:
The low charcoal sintering method of iron ore, comprises and iron ore, fuel, flux first being sintered after preparing burden, being mixed to get compound again, wherein: described iron ore by quality ratio, comprises magnetite >=50%, non-magnetite≤40%, metallurgical waste≤10%;
Wherein, described non-magnetite is at least one in rhombohedral iron ore, limonite, spathic iron ore;
The main chemical compositions of described metallurgical waste is at least one in Fe, FeO.
In sintering method of the present invention due to magnetite, return mine, in metallurgical waste all containing at least one in FeO, Fe, in magnetite, FeO content reaches 20% ~ 30%, and FeO, Fe oxidizing reaction belongs to thermopositive reaction.Theoretical Calculation 1kg FeO oxidation heat liberation is equivalent to 0.068kg coke powder or 0.09kg hard coal; 1kg Fe oxidation heat liberation is equivalent to 0.264kg coke powder or 0.335kg hard coal.Therefore, add magnetite, return mine, metallurgical waste can increase non-carbon heat income, reduce mixed carbon comtent, sintering energy consumption be minimized.
Metallurgical waste specifically can select at least one in ferrous alloy powder, roll scale, scum, steel-making dust, steel-smelting sewage sludge, slag, desulfurization slag, slag iron, steel rolling chip, precipitating sludge, gas ash, gas mud, all slag, tailings, blast-furnace dust, power gas, dedusting ash.
In technique scheme, in batching, mixing step, by weight percentage, fuel 1% ~ 7%, flux 1% ~ 15%, all the other are iron ore.
For reclaiming waste heat of returning mine, improve material structure, improve resource utilization, after compound iron ore, fuel, flux, can add compound of returning mine to obtain, the add-on of returning mine is 0 ~ 50% of mixture quality; When add-on of returning mine is mixture quality 30%, best results.
In technique scheme, for reducing sintering energy consumption, compound fixed carbon content≤2.6% should be controlled.
In technique scheme, for reducing sintering fusing point, energy efficient, should control compound Al 2o 3/ SiO 2mass ratio is 0.3 ~ 0.5.
In technique scheme, described flux selects grog flux can save decomposition heat.At least one in preferred unslaked lime, quickened lime or high magnesium ash.Described high magnesium ash is the unslaked lime containing MgO 20% ~ 50%.
In gas ash, gas mud, fixed carbon content is 15% ~ 20%.In technique scheme by quality ratio, in metallurgical waste, 20% ~ 50% is at least one in gas ash, gas mud, can save mineral fuel.Gas ash is in blast furnace ironmaking process, is entrained in the fine dust in blast furnace gas, and through dry gas cleaning gained dry type grain dust, the product through wet dust removal gained is gas mud through precipitation.
In technique scheme, should control 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, less than 10% granularity >3mm in fuel should be controlled, less than 15% granularity <0.5mm in fuel.
For utilizing the effect of bed of material auto accumulation heat, improve heat utilization ratio, the present invention sinters and should adopt deep-bed sintering, bed thickness >=600mm, for guaranteeing to sinter efficiency, the preferred 800mm ~ 1000mm of bed thickness.
In technique scheme, before sintering, mixture temperature is risen to more than 60 DEG C, the physical thermal of compound can be increased, eliminate the harm of sintered wet layer simultaneously, for energy efficient object, preferably compound is warming up to 80 DEG C.
In technique scheme, for improving sinter strength and metallurgical performance, should control sintering temperature is 1250 DEG C ~ 1280 DEG C.
In technique scheme, for reducing thermosteresis, should control flue-gas temperature is 90 DEG C ~ 150 DEG C.
In technique scheme, joining charcoal for reducing, reducing sintering burnup cost, should control sintering gained sintering mine FeO is 5% ~ 8%.
After sintering, the agglomerate of granularity < 5mm is participated in next batch sintered material as returning charge, can waste heat of returning mine be reclaimed, improve material structure, and improve resource utilization.
Power gas of the present invention is the gas ash that power plant's cleaning coal gas obtains.
Dedusting ash of the present invention is the dust that sintering environment fly-ash separator is collected, and chemical composition is close with agglomerate.
Unless otherwise indicated, in the present invention, ratio, content, composition etc. are mass percent.
Beneficial effect of the present invention is as follows:
1, the inventive method is by the raw material composition in adjustment compound, adds non-carbon heat income, reduces mixed carbon comtent, sintering energy consumption is minimized.
2, compound Al is controlled by adjustment 2o 3/ SiO 2mass ratio, makes compound fusing point be minimized, achieves low-temperature sintering.
3, the inventive method can adopt the industrial wastes such as metallurgical iron-containing waste, gas ash, reaches the object of waste reclaimation, has saved cost, alleviated environmental stress.
Embodiment
Below in conjunction with embodiment, the present invention is further described.
1, rational ore kind and matching structure is adopted.Current nature has the large class of magnetite, rhombohedral iron ore, limonite, spathic iron ore four, and except magnetite contains higher FeO, sintering reaction is outside thermopositive reaction, and in other ore, FeO is very low or not containing FeO, sintering reaction is thermo-negative reaction.But depending on ore formation condition, nature also has the composite ore of above-mentioned ore.
Magnetite contains FeO 20% ~ 30%, and high through oversintering rear oxidation degree, in magnetite, FeO releases a large amount of heats in the oxidation reaction in sintering process, can reduce sintering and join charcoal amount.Magnetite FeO oxidation heat liberation is as follows:
FeO+1/4O 2＝1/2Fe 2O 3+284.57829/2(KJ/mol)
Theoretical Calculation is known, and 1kg FeO oxidation heat liberation is equivalent to 0.068kg coke powder or 0.09kg hard coal.Contriver tests discovery, and be >=50% by magnetite proportioning, non-magnetite proportioning is≤40%, and metallurgical waste≤10% can improve oxidizing reaction exothermal effect.
2, iron containing metallurgical waste material is added.Any iron and steel enterprise inevitably produces the metallurgical wastes such as iron sheet, scum, steel-smelting sewage sludge, slag, desulfurization slag, slag iron, steel rolling chip, precipitating sludge, these iron containing metallurgical waste material principal features one are containing metallic iron or FeO, the main composition of partial metallurgical waste material refers to table 1, oxidizing reaction in sintering process, releases amount of heat; Two is containing ripe property CaO, can save decomposition of limestone heat dissipation during sintering, reduces and joins charcoal amount.
Metallic iron oxidation heat liberation:
Fe+3/4O 2＝1/2Fe 2O 3+823.45792/2(KJ/mol)
Theoretical Calculation 1kg Fe oxidation heat liberation is equivalent to 0.264kg coke powder or 0.335kg hard coal, and every 200kg metallic iron oxidation heat liberation can meet 1 ton of agglomerate sintering institute heat requirement, need with addition of fuel.
Table 1 main metallurgical waste chemistry composition (%)
Title FeO SiO 2 CaO MgO Al 2O 3 V 2O 5 TiO 2 S Ig P Fe 2O 3
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 dust 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
Equal slag 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 is containing fixed carbon 18.21%, and blast-furnace dust is containing fixed carbon 17.05%.
3, reduce sintering mine FeO, reduce and join charcoal.
FeO in agglomerate is mainly derived from raw material and sintering reaction generates.There is oxidizing reaction in the FeO in raw material, if FeO in raw material is higher than sintering mine FeO, then sintering process overall control is in oxidizing atmosphere in sintering reaction, then the trend of C burning generation CO is suppressed, and joining charcoal amount must reduce; If FeO content in raw material is lower than sintering mine FeO, then sintering atmosphere controls by CO reductibility, and C burning is the prerequisite of producing CO, and therefore joining charcoal amount must increase.Facts have proved, FeO Content in Sinter and solid fuel consumption amount are near linear elevational relationship, and control FeO in Sinter just can reduce joins charcoal amount.Sintering mine FeO is controlled while guarantee Sintering Operation Index index, sintering burnup cost to be reduced, improve metallurgical performance 5% ~ 8%, temperature (900 DEG C) reduction degree in raising.
4, adopt deep-bed sintering, increase the effect of bed of material auto accumulation heat, improve heat utilization ratio.
The sintered layer on sinter machine top is by freezing air quick refrigeration, and crystallization degree is low, and glassiness content is high, intensity difference, and powder is many.As increased bed thickness, the ratio of upper strata intensity difference then reduces relatively.Deep-bed sintering becomes the Main Means of Increasing Production and Energy Saving for this reason.When bed thickness increases, the corresponding increase of thermal zone thickness, sintering velocity slows down, and crystallizable mineral condition improves, and high temperature hold time extends, and intensity and yield rate improve.Contriver tests discovery, when bed thickness is 180mm ~ 220mm, heat storage capacity accounts for 35% ~ 45% of zone of combustion heat income, when the bed of material reaches 400mm, heat storage capacity reaches 55% ~ 60%, therefore improving bed thickness and can reduce firing rate, when guaranteeing complete combustion of fuel, can fuel availability be improved.Experiment shows, the bed of material often improves 10mm, reduces solid burnup 0.5kg ~ 1.0kg/t.Therefore, bed thickness should be not less than 600mm, and bed thickness is especially best with 800m ~ 1000mm.
5, fuel granularity controls.In sintering, the part of fuel granularity <0.5mm is enriched in bed of material top, and the fuel enrichment of granularity >3mm is in material layer lower part, and bed of material top heat demand is many, and bottom heat demand is few.This requires completely contrary with sintering thermal system.Meanwhile, during burning, fuel granularity varies in size, and combustionvelocity is different, and heat transfer rate is also different.Therefore, the fuel that as far as possible should reduce granularity > 3mm and granularity < 0.5mm selected by fuel.
6, adopt grog flux, reduce carbonate decomposition heat.Sintering adopt unslaked lime, quickened lime, high magnesium ash, can reduce Wingdale, rhombspar decomposition heat, reduce join charcoal amount.Decomposition of limestone:
CaCO 3＝CaO+CO 2-177.7(KJ/mol)
Theoretical Calculation 1kg CaCO 3divide heat of desorption to be equivalent to 0.064kg coke powder or 0.081kg hard coal, adopt unslaked lime or quickened lime to substitute Wingdale, can save a part of decomposition heat.
In addition, quicklime slaking exothermic heat of reaction:
CaO+H 2O＝Ca(OH) 2+64.90(KJ/mol)
Theoretical Calculation 1kg CaO digests heat release and is equivalent to 0.042kg coke powder or 0.053kg hard coal.With the Wingdale of 85%CaO unslaked lime for sintering alternative 54%, calculating by effective CaO, with the alternative 1.64kg Wingdale of 1kg unslaked lime, being decomposition heatly equivalent to 0.140kg coke powder or 0.178kg hard coal with digestion reaction heat release.Such as, use unslaked lime 65kg in production, Theoretical Calculation can save coke powder 9.1kg, or saving hard coal 11.54kg, but it is thorough to there is digestion in actual production, and decompose the factors such as incomplete and thermosteresis, actual energy-saving effect is lower than calculated value.
In addition, CaO content about 35% in slag, also can save decomposition of limestone heat for sintering.
Quickened lime is the one of unslaked lime, has that crystal is little, dispersity is high, activity degree is large, adds water that digestion rate is fast, amount of cure high.Unslaked lime CaO content is generally 75% ~ 85%, and activity degree is generally 180mL ~ 230mL, and the general CaO of quickened lime can reach 90% ~ 96%, and activity degree generally can reach 300mL ~ 350mL.Because quickened lime activity degree is high, strengthening effect is stronger than unslaked lime, and pellet performance improves, and can be deep-bed sintering and creates conditions; Quickened lime is stronger to the activation performance of fuel combustion, can improve combustionvelocity, and reduce decomposition of limestone heat; Can promote that liquid phase generates simultaneously, improve intensity and yield rate.
Quicklime slaking exothermic heat of reaction, mixture temperature more than 10 DEG C can be improved in theory preparing in raw materials for sintering with addition of 5% unslaked lime, actual effect can reach 3 DEG C ~ 5 DEG C, unslaked lime also can reduce carbonate decomposition heat after substituting Wingdale, therefore unslaked lime has Intensified support and sintering, saves the multi-efficiency of solid burnup.
7, sintering process parameter controls.
(1) improve more than mixture warm to 60 DEG C, wet layer impact can be reduced over.Specifically can adopt steam preheating, preheating of returning mine, hot water preheating, conventional pre-heating mean such as digestion preheating, hot-air pre-heating etc.
(2) controlling mixture moisture is 6.0% ~ 7.5%, can reduce moisture evaporation physical thermal.The low water of deep-bed sintering, can reduce over wet layer harm and heat expenditure.
(3) ratio of returning mine is controlled.During maintenance balance of returning mine, the ratio accounting for compound of returning mine is advisable with 0 ~ 50%, best with 30%, can reach the optimum balance of productivity and compound granularity simultaneously.Compound granularity is thicker, and productivity is higher.Productivity is productivity of sintering machine, unit t/m 2h, represents the output of the agglomerate that every square area is produced within the unit time.
(4) flue-gas temperature is controlled.In sintering thermal equilibrium, waste gas band becomes popular as total heat expenditure about 25%, and reduction spent air temperture just can reduce heat to be pointed out, direct effect to reduce the heat demand of joining charcoal.Flue-gas temperature is controlled can reduce heat expenditure at 90 DEG C ~ 150 DEG C; protect smoke extractor from the impact of high temperature and low-temperature flue gas simultaneously; flue-gas temperature too high generation thermal stress damage smoke extractor rotor, flue-gas temperature is too low, produces water vapour, and the dust mud that wets hangs over damage equipment on smoke extractor rotor.
8, fixed carbon controls.
Under the condition that 1 ~ 7 condition possesses, control below 2.6% by compound solid carbon, can reduce solid burnup 10% ~ 20%, ensure sintering institute heat requirement, wherein most of origin of heat burns in non-charcoal simultaneously.Accordingly, control FeO in agglomerate and, 5% ~ 8%, control sintering temperature 1250 DEG C ~ 1280 DEG C, can improve and reach agglomerate mineral composition, improve the effect of intensity and metallurgical performance.Control Al 2o 3/ SiO 2mass ratio is 0.3 ~ 0.5, can reduce sintering fusing point.Al 2o 3/ SiO 2mass ratio is too high, be unfavorable for energy-conservation with improve Sintering Operation Index, such as Al 2o 3/ SiO 2when mass ratio is 0.8, sintering temperature is more than 1300 DEG C, need additionally provide more heat energy for reaching sintering temperature.
Adopt the inventive method can reduce joining charcoal and not affecting the main performance index of agglomerate in sinter mixture, ensure needed for sintering heat, reach fuel economy and reduce CO 2the object of discharge, achieves low charcoal low cost sintering.
Below in conjunction with specific embodiment, the present invention is further described.
Embodiment 1
Laboratory test:
Mixture is completed, parallel laboratory test 10 groups according in table 2.According to existing sintering process carry out cloth, igniting, down draft sintering, heat broken, cool, sieve the links such as whole grain and sinter.Sintering condition and sintering the results are shown in Table 3.
Low charcoal sintering main material proportioning (%) in table 2 laboratory
The low charcoal sintering condition in table 3 laboratory and sintering result
Test model synthetic techniques: adopt composite index law, for multiple indexs of a system, some indexs are more high better, are called high excellent index, the tumbler index, utilization coefficient etc. of such as this test; Some indexs are more low better, are called low excellent index, such as solid burnup, low temperature reduction degradation index etc.The single index number p of high excellent index, discusses calculation, i.e. p=X/M with measured value X and standard value M; The 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 optimum value, aggregative index, and namely single index number is added after being multiplied by weights again, and weights are determined by expertise.For this test, the existing index investigated has yield rate, utilization coefficient, tumbler index, solid burnup, finds out their standard value, then calculates single index number p, and calculate aggregative index I, weight allocation is 10:30:30:30, and the higher effect of aggregative index is better.According to integrated evaluating method, weight does not affect the sequence of test net effect.
Manufactured 10 batches of agglomerate in embodiment 1 altogether, from table 3, agglomerate single index or comprehensive evaluation index 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 net effect on the contrary.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, net effect index is 93-94.06, than being deteriorated to some extent containing charcoal 2.16%; When reaching 2.46% containing charcoal, aggregative index is 91.57-93.21, when being 2.61% containing charcoal, aggregative index 92.15-92.50, as seen under the enough condition of sintering heat, along with the raising of joining charcoal amount, agglomerate aggregative index progressively declines on the contrary, and namely effect is progressively deteriorated, and illustrates under condition possesses situation, low charcoal sintering is feasible, and effect is better.
Embodiment 2
260m 2sinter machine commerical test:
Complete batching according to proportioning in table 4 and mix, parallel laboratory test 7 groups.According to existing sintering process carry out cloth, igniting, down draft sintering, heat broken, cool, sieve the steps such as whole grain and sinter.Experimental result is in table 5.
Table 4260m 2sinter machine low charcoal sintered material structure and proportioning (%)
In table 4, quickened lime 1 is containing CaO90%, and quickened lime 2 is containing CaO85%.
Table 5260m 2sinter machine low charcoal sintering commercial test results
At certain sintering plant 260m 2sinter machine carries out the commerical test of low charcoal sintering, carried out 7 groups of experiments according to table 4 Raw proportioning.The weight allocation of utilization coefficient 35, solid burnup 35, tumbler index is 35:35:30.As can be seen from Table 5, along with compound fixed carbon content increases, there is the trend that FeO rises, solid burnup rises, aggregative index is progressively deteriorated.When joining charcoal 2.40%, aggregative index is up to 99.45; Join charcoal when reaching about 2.60%, aggregative index is down to about 96 on the contrary; And when joining charcoal 2.8% ~ 2.9%, aggregative index is down to 93-95, net effect is deteriorated.Adopt the present invention's low charcoal sintering net effect better as can be seen here.

Claims (10)

1. the low charcoal sintering method of iron ore, comprises and iron ore, fuel, flux first being sintered after preparing burden, being mixed to get compound again, it is characterized in that: in massfraction, magnetite content>=50% in described iron ore, non-magnetite content m 1: 0 < m 1≤ 40%; Metallurgical waste content m 2: 0≤m 2≤ 10%;
Wherein, described non-magnetite is at least one in rhombohedral iron ore, limonite, spathic iron ore;
The main chemical compositions of described metallurgical waste is at least one in Fe, FeO;
Preferably, metallurgical waste is at least one in ferrous alloy powder, roll scale, scum, steel-making dust, steel-smelting sewage sludge, slag, desulfurization slag, slag iron, steel rolling chip, precipitating sludge, gas ash, gas mud, all slag, tailings, blast-furnace dust, power gas, dedusting ash.
2. the low charcoal sintering method of iron ore according to claim 1, is characterized in that, meets following at least one item:
Control compound fixed carbon content≤2.6%;
Control compound Al 2o 3/ SiO 2mass 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.
3. the low charcoal sintering method of iron ore according to claim 1, is characterized in that: be sintered to deep-bed sintering in described sintering step, bed thickness >=600mm; Preferably, bed thickness is 800mm ~ 1000mm.
4. the low charcoal sintering method of iron ore according to claim 1, is characterized in that: in described batching, mixing step, by weight percentage, fuel 1% ~ 7%, flux 1% ~ 15%, and all the other are iron ore.
5. the low charcoal sintering method of iron ore according to claim 1, is characterized in that: by quality ratio, and in metallurgical waste, 20% ~ 50% is at least one in gas ash, gas mud.
6. the low charcoal sintering method of iron ore according to claim 1, is characterized in that: described flux is grog flux; At least one in preferred unslaked lime, high magnesium ash, quickened lime.
7. the low charcoal sintering method of iron ore according to claim 1, is characterized in that: less than 10% granularity >3mm in described fuel, less than 15% granularity <0.5mm in described fuel.
8. the low charcoal sintering method of iron ore according to claim 1, is characterized in that: controlling compound water-content is 6.0% ~ 7.5%.
9. the low charcoal sintering method of iron ore according to claim 1, is characterized in that: before sintering, mixture temperature is risen to more than 60 DEG C; Preferably compound is warming up to 80 DEG C.
10. the low charcoal sintering method of the iron ore according to any one of claim 1 ~ 9, is characterized in that: after having sintered using the agglomerate of granularity < 5mm as use of returning mine; The add-on of returning mine is 0 ~ 50% of mixture quality; The add-on of preferably returning mine is 30% of mixture quality.
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Cited By (8)

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Publication number Priority date Publication date Assignee Title
CN104726696A (en) * 2015-04-17 2015-06-24 唐山瑞丰钢铁（集团）有限公司 Medium-alkali thick blanking layer sintering and producing method
CN107782147A (en) * 2016-08-30 2018-03-09 河南凤宝特钢有限公司 A kind of method for reducing pallet burnup
CN109402384A (en) * 2018-12-26 2019-03-01 中天钢铁集团有限公司 A method of sintering reduces NOx
CN109439893A (en) * 2018-11-20 2019-03-08 广东广青金属科技有限公司 Stainless steel slag blast furnace sinter method
CN109722529A (en) * 2019-01-29 2019-05-07 攀钢集团攀枝花钢钒有限公司 The test method of laboratory raising sinter mixture temperature
CN111363915A (en) * 2020-04-08 2020-07-03 攀钢集团攀枝花钢钒有限公司 Method for treating SDS (sodium dodecyl sulfate) desulfurization waste residue
CN111778393A (en) * 2020-07-14 2020-10-16 天津天钢联合特钢有限公司 Technological method for realizing sintering of super-thick material layer
CN115323165A (en) * 2022-06-08 2022-11-11 中南大学 Sintered carbon emission reduction method for coupling hydrogen-rich gas and solid waste containing metallic iron for heat supply

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CN101338363A (en) * 2008-08-27 2009-01-07 攀枝花新钢钒股份有限公司 High titan type low FeO content sinter and method for preparing same
CN102443693A (en) * 2011-12-08 2012-05-09 攀钢集团研究院有限公司 Sintering method of high-grade high-titania vanadium-titanium magnetite concentrate
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Publication number Priority date Publication date Assignee Title
CN104726696A (en) * 2015-04-17 2015-06-24 唐山瑞丰钢铁（集团）有限公司 Medium-alkali thick blanking layer sintering and producing method
CN107782147A (en) * 2016-08-30 2018-03-09 河南凤宝特钢有限公司 A kind of method for reducing pallet burnup
CN109439893A (en) * 2018-11-20 2019-03-08 广东广青金属科技有限公司 Stainless steel slag blast furnace sinter method
CN109402384A (en) * 2018-12-26 2019-03-01 中天钢铁集团有限公司 A method of sintering reduces NOx
CN109722529A (en) * 2019-01-29 2019-05-07 攀钢集团攀枝花钢钒有限公司 The test method of laboratory raising sinter mixture temperature
CN111363915A (en) * 2020-04-08 2020-07-03 攀钢集团攀枝花钢钒有限公司 Method for treating SDS (sodium dodecyl sulfate) desulfurization waste residue
CN111778393A (en) * 2020-07-14 2020-10-16 天津天钢联合特钢有限公司 Technological method for realizing sintering of super-thick material layer
CN115323165A (en) * 2022-06-08 2022-11-11 中南大学 Sintered carbon emission reduction method for coupling hydrogen-rich gas and solid waste containing metallic iron for heat supply
CN115323165B (en) * 2022-06-08 2023-11-10 中南大学 Sintered carbon emission reduction method for coupling heating of hydrogen-rich fuel gas and solid waste containing metallic iron

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