CN1596293A - Coal briquettes for smelting reduction process, and method for manufacturing the same - Google Patents

Coal briquettes for smelting reduction process, and method for manufacturing the same Download PDF

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Publication number
CN1596293A
CN1596293A CNA038016095A CN03801609A CN1596293A CN 1596293 A CN1596293 A CN 1596293A CN A038016095 A CNA038016095 A CN A038016095A CN 03801609 A CN03801609 A CN 03801609A CN 1596293 A CN1596293 A CN 1596293A
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Prior art keywords
coal
sludge
dust
weight
agglomerate
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CN1328358C (en
Inventor
赵敏永
秦英珠
柳进浩
南宫源
金长洙
李钟列
李达会
李晙赫
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Pohang Research Institute Of Industry Science
Posco Co Ltd
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Pohang Research Institute Of Industry Science
Posco Co Ltd
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Priority to KR1020020052556 priority Critical
Priority to KR1020020052556A priority patent/KR100905581B1/en
Priority to KR10-2002-0052556 priority
Application filed by Pohang Research Institute Of Industry Science, Posco Co Ltd filed Critical Pohang Research Institute Of Industry Science
Publication of CN1596293A publication Critical patent/CN1596293A/en
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    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10LFUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L5/00Solid fuels
    • C10L5/02Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
    • C10L5/06Methods of shaping, e.g. pelletizing or briquetting
    • C10L5/10Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders
    • C10L5/14Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders with organic binders
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10LFUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L5/00Solid fuels
    • C10L5/40Solid fuels essentially based on materials of non-mineral origin
    • C10L5/48Solid fuels essentially based on materials of non-mineral origin on industrial residues and waste materials
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00Technologies for the production of fuel of non-fossil origin
    • Y02E50/30Fuel from waste, e.g. synthetic alcohol or diesel

Abstract

Disclosed herein are a coal briquette for a smelting reduction process in which coal and iron ore are charged into a smelting furnace to produce a molten iron, and a method for manufacturing the coal briquette. The coal briquette comprises 50 % by weight or less of at least one of sludge and dust and the balance of fine coal, as major components, the sludge and the dust including iron (Fe) or iron compounds, carbon (C), Ca compounds and Mg compounds, and 5 &tilde& 20 parts by weight of a binder, based on 100 parts by weight of the major components.

Description

Coal agglomerate and manufacture method thereof that smelting reduction process is used
Technical field
The present invention relates to the coal agglomerate that smelting reduction process is used, in described technology, coal and iron ore are joined in the melting furnace to produce the technology of molten iron.More specifically, the present invention relates to comprise sludge and ashes be raw material, have the enough whereabouts intensity that smelting reduction process requires and the coal agglomerate and a manufacture method thereof of thermal decrepitation.
Background technology
As is generally known, because the novel FINEX and the COREX technology coal instead of coke of smelting reduction process (producing the technology of molten iron with coal), as the fuel of melting furnace, so they have advantage aspect the operability of fuel.The granularity of smelting reduction process available coal is limited to and is not less than 8 millimeters.In the granularity of coal during less than 8 millimeters, they can not perfect combustion in melting furnace, and collected by particle collector.In addition, when granularity is excessive less than 8 millimeters coal dust add-on, can occur in the undesirable imbalance that causes variety of issue in the technological process, as owing in particle collector, catch the fuel crunch that causes.Therefore, the such application of coal dust in ironmaking process is restricted.But most of coals of the present usefulness of ironmaking process are to be not more than 8 millimeters fine particle by granularity to constitute.
Because coal dust is restricted,, or be used to make the fuel of coke so it is mainly used in breeze blowing (PCI) in the use of smelting reduction process.But coal can be used in smelting reduction process and is showing aspect its characteristic, and other technologies beyond smelting reduction process use coal dust also restricted.Therefore, need exploitation in smelting reduction process, use, in a suitable manner can be with the method for coal dust in conjunction with the coal-forming agglomerate.
PCT communique WO02/50219 proposes a kind of method that can be used in the coal agglomerate of ironmaking technique of fusion and reduction with coal dust production.The coal agglomerate that this communique provides is to produce with coal dust by mixing as the syrup of binding agent with as the unslaked lime of stiffening agent.Because smelting reduction process is different from the technology of blast furnace ironmaking, so the performance that the coal agglomerate is required is also different.In blast furnace technology, because the temperature on the top of blast furnace is low to 200-300 ℃, so do not consider the moving explosion of heat especially.At this moment, coal agglomerate and agglomerate sequentially join in the blast furnace, drop to the bottom of blast furnace then lentamente.Therefore, the coal agglomerate that requires blast furnace technology to use has high compressive strength.On the contrary, in smelting reduction process because in the temperature on the top of melting furnace up to 1000 ℃, so coal agglomerate one joins the volatilized and explosion of the volatiles of coal agglomerate in the melting furnace.Therefore, thermal explosion fragility and the moving burst of heat and whereabouts intensity are the important factors that coal agglomerate that smelting reduction process is used requires.Though the coal agglomerate of prior art satisfies the various performances that smelting reduction process requires, as is not less than 70% whereabouts intensity, be not less than 70% thermal explosion fragility, they only use coal dust as raw material.
Produce various byproducts from the ironworks.These byproducts in the recycling iron-smelting process can produce advantage economically.These byproducts are divided into following four classes substantially: dust, sludge, slag and waste refractory materials.Wherein, because dust and sludge contain a large amount of iron or iron cpd, carbon (C), calcium cpd and magnesium compound, therefore they are recycled as raw material in ironworks and cement industry.Iron cpd mainly comprises ferric oxide.But a large amount of dust and sludge can be by solidifying or calcining buried less than recycling.Therefore, handle and recycle these byproducts and become important environmental problem gradually.
Produce dust and sludge in the ironworks from each technological process.They contain the carbon that can be used as thermal source and reductive agent, can be used as the iron cpd of source of iron and can be used as the calcium cpd and the magnesium compound of additive.Most dust and sludge granularity are not more than 1 millimeter.Moisture content in them depends primarily on various technologies, or the character of dust and sludge.Because dust and sludge contain a large amount of valuable constituents, so their part is recovered utilization.Consider the component and their character and the pollution of secondary etc. that contain in dust and sludge, needs are a kind of can be in the recycling dust in the pig iron manufacturing process and the novel method of sludge.Because the higher moisture of sludge and extra drying step are seldom recycled sludge.Therefore, it is very important recycling sludge.
Summary of the invention
Therefore, developed the present invention in view of the above problems, the objective of the invention is, used the byproduct of producing from the ironworks, the coal agglomerate of enough whereabouts intensity, thermal decrepitation and the moving explosion performance of heat with smelting reduction process requirement is provided as raw material.
Another object of the present invention provides the method for making described coal agglomerate.
The coal agglomerate that provides a kind of smelting reduction process to use to achieve these goals, it comprises:
Be not more than 50% the sludge and the coal dust of its surplus as the weight of main ingredient, described sludge comprises iron (Fe) or iron cpd, carbon (C), calcium cpd and magnesium compound; With
With described main ingredient is 100 parts, and weight is the binding agent of 5-20 part.
According to another aspect of the present invention, provide a kind of coal agglomerate of smelting reduction process, it comprises:
Be not more than 50% the dust and the coal dust of its surplus as the weight of main ingredient, described dust comprises iron (Fe) or iron cpd, carbon (C), calcium cpd and magnesium compound; With
With described important component is 100 parts, and weight is the binding agent of 5-20 part.
According to another aspect of the present invention, provide a kind of coal agglomerate of smelting reduction process, it comprises:
As main ingredient, weight is not more than 50% sludge and the mixture of dust and the coal dust of its surplus, described sludge and dust comprise compound, carbon (C), calcium cpd and the magnesium compound of iron (Fe) or iron; With
With described important component is 100 parts, and weight is the binding agent of 5-20 part.
According to a further aspect in the invention, provide a kind of method of making the coal agglomerate that smelting reduction process uses, it comprises step:
Mixing one of is not more than in 50% sludge and the dust at least coal dust with its surplus as the weight of main ingredient, and sludge and dust comprise compound, carbon (C), calcium cpd and the magnesium compound of iron (Fe) or iron; With
Adding is 100 parts with described important component, and weight is the binding agent of 5-20 part, and stirs; The mixture that obtains with shaping.
If desired, before adding binding agent, can add with main ingredient is 100 parts, and weight is not more than 5 parts unslaked lime as stiffening agent, aging then.
The present invention finds, the result who realizes as the present invention, and the sludge of the byproduct of producing with the ironworks or dust and coal dust are that the coal agglomerate of raw material manufacturing can be used in smelting reduction process (FINEX or COREX).Coal agglomerate according to the present invention satisfies the moving explosion performance demands of whereabouts intensity, thermal decrepitation and heat of smelting reduction process.Particularly, can be dry or moist as sludge according to coal agglomerate raw material of the present invention.
Description of drawings
Describe above-mentioned and other purposes, feature and other advantages of the present invention in detail below in conjunction with accompanying drawing, wherein:
Fig. 1 schematically illustrates the fast method flow diagram of sludge used according to the invention and dust manufacturing coal group.
Embodiment
Below with regard to coal agglomerate and manufacture method explanation the present invention thereof.
[coal agglomerate]
Coal agglomerate of the present invention comprise sludge and dust at least one of them and coal dust as major constituent; And binding agent.If desired, coal agglomerate of the present invention also comprises stiffening agent.
[coal dust]
The coal dust of Shi Yonging is the coal that does not satisfy pig iron production technique (COREX technology) granularity requirements in the present invention.That is to say, in COREX technology, recommend usually to use particle to be not less than 8 millimeters coal.Therefore, the particle of the coal dust of usefulness is below 8 millimeters, preferably less than 4 millimeters in the present invention.Therefore when pulverized coal particle is not less than 8 millimeters,, and can cause breaking of the coal agglomerate that obtains in the exigent snap-in force of forming step.Therefore, preferably coal dust is ground into granularity below 4 millimeters.
[sludge and dust]
For example iron (Fe) or iron cpd, carbon (C), calcium cpd and magnesium compound of the valuable component that comprises of sludge of Shi Yonging and dust in the present invention.Iron cpd mainly comprises ferric oxide.
Sludge and the dust that produce in ironworks (pig iron smelting technology and process for making etc.) comprise above-mentioned valuable component.The physicals of sludge and dust is similar except moisture content.Therefore, if sludge is dried, the physicals of sludge is identical with dust almost.
Sludge can use at dried forms, and still the not dried forms with it is a feature.That is to say that the raw material of the coal agglomerate of using as smelting reduction process of the present invention can use undried sludge.Undried sludge preferably contains and is not more than 50% moisture.Surpass at 50% o'clock at undried sludge moisture, undried sludge can not be distributed in the coal dust equably, and final coalescent with the form of agglomerate.That is to say that isolating undried sludge reduces the whereabouts intensity of the coal agglomerate that obtains and thermal explosion fragility.
The exsiccant sludge that can use in the present invention on the other hand, contains and is not more than 5% water.
Consider sludge and dust recycled as the raw material of the coal agglomerate of pig iron smelting technology that valuable component concentration is high more good more.Preferably, valuable components contents is not less than 30% of sludge or dust dry weight.Sludge or dust can contain just like Zn, basic metal, Al 2O 3, S, P, Cl etc. impurity.The content of these impurity preferably limits as follows: be not more than 2.0% Zn, be not more than the basic metal of gross weight 2.0%, be not more than 1.0% S, be not more than 1.0% P, be not more than 6.0% Al 2O 3And be not more than 1.0% Cl.Because Zn and basic metal can form precipitation in the gasification and melting stove, gas flow is had a negative impact and hinders the following degradation of furnace charge, their content preferably is restricted to respectively and is not more than 2.0%.Because S and P are confined component in molten iron, so their content preferably is limited in respectively and is not more than 1.0%.Because Al 2O 3Be the debatable component that influences slag fluidity, prevent that slag from flowing so require to add a large amount of auxiliary materials.Therefore, with Al 2O 3Content is restricted to and is not more than 6.0%, preferably is not more than 3.0%.Cl can gather dense in water treating equipment, therefore corrodes these equipment.Therefore, the content of Cl is preferably limited to and is not more than 1.0%.
Preferably, the content of the gross weight of valuable component and impurity satisfies above-mentioned requirements.When the content of the gross weight of valuable component and impurity exceeds above-mentioned preferable range, can and exceed the sludge or the mix dust of above-mentioned scope with sludge in above-mentioned preferable range or dust, make the gross weight of valuable constituent and foreign matter content satisfy these preferable range.
The representation example that satisfies the sludge of preferable range comprises sludge from the ironworks blast furnace, with the sludge of the water treating equipment of the sludge of the molten iron manufacturing process of coal, Steel Plant and the sludge of sewage disposal device.On the other hand, as dust, the main dust that uses from wire rod facility in ironworks.Because surpass the permission content range of basic metal and Cl, so do not wish with they raw materials as coal agglomerate of the present invention from the dust of the agglomerating plant in ironworks.Table 1 illustrates from the sludge of ironworks generation and the composition of dust.
</entry></row></tbody></tgroup></table></tables>
Preferably, the main ingredient of coal agglomerate of the present invention comprises, weight is not more than the coal dust of at least a and its surplus of 50% sludge and dust.50% when above, may make the physicals of the coal agglomerate that produces reduce at the content of sludge and dust.Because the physicals of sludge is similar to dust, so can suitably determine the ratio of mixture of sludge and dust.
[binding agent]
The spendable binding agent of the present invention comprises petroleum pitch, petroleum (petroleum pitch), petroleum pitch (petroleum bitumen), syrup, thermosetting resin, starch and cement etc., preferred syrup.The syrup solid weight content is preferably 70-80%.When solids content was lower than 70%, the sugared content that manifests the binding agent natural characteristics was too low.Be higher than at 80% o'clock in solids content and since syrupy high viscosity it can not with other component uniform mixing.
Weight in main ingredient is 100 parts, and the add-on of binding agent is 5-20 part, and wherein main ingredient is not more than 50% sludge by content and dust is at least a and coal dust its surplus is formed.When the weight of binder that adds was lower than 5 parts, the fabrication strength of coal agglomerate was too low.When the adding weight of binding agent is higher than 20 parts, since uneconomical, not preferred.
[stiffening agent]
If desired, coal agglomerate of the present invention also comprises stiffening agent.As stiffening agent, can use as inorganic materials such as unslaked lime (CaO), Wingdale, iron ore, bauxite, most preferably with unslaked lime.By being transformed into white lime with the moisture generation thermopositive reaction unslaked lime (CaO) that in coal dust or sludge, contains.Can remove moisture in coal dust or the sludge by thermopositive reaction unslaked lime.Unslaked lime preferably has and is not more than 1 millimeter granularity.Quicklime particles is more little, and specific surface area is big more.Therefore, unslaked lime by with coal dust in reaction of moisture be transformed into white lime easily.
The main ingredient weight that constitutes in coal dust, sludge and dust is 100 parts, preferably adds the stiffening agent of 5 parts of weight.When adding stiffening agent weight above 5 parts, the physicals of the coal agglomerate of generation reduces.
[manufacturing of coal agglomerate]
Add binding agent by the main ingredient that constitutes to coal dust, sludge and/or dust and make coal agglomerate of the present invention, when needed, also add stiffening agent.The mixing order of these raw materials and process variable influence the physicals of coal agglomerate.In the present invention, as binding agent, make stiffening agent with syrup with unslaked lime.Fig. 1 illustrates the most preferred method of making the coal agglomerate.
At first, at least a in the sludge of adding 50% weight and the dust in coal dust.
Whether drying changes mixing time according to sludge.When sludge was exsiccant, mixing time was not more than 3 minutes.When sludge was moist, mixing time was in 3-10 minute.
When the exsiccant sludge being mixed more than 3 minutes the time, the time of increase is helpless to the improvement of performance.During less than 3 minutes, coal dust is incomplete with mixing of undried sludge, may lump in undried sludge mixing time.During greater than 10 minutes, the time of increase does not have help to improving performance in undried sludge mixing time.
The weight of the main ingredient that constitutes at coal dust, sludge and dust is 100 parts of timing, and the adding weight of unslaked lime is 5 parts.In mixing tank, mix, obtain uniform mixture.Mixing time is preferably in 1-3 minute the scope.
Then, with the aging white lime that is transformed into of unslaked lime.This wears out and partly carries out in mixing tank, but this is owing to the short relatively residence time in mixing tank is restricted.Therefore, the time of growing in the aging holder that is preferably in as funnel.Preferred aging carrying out about 2 minutes-2 hours.
Aged mixture and weight are that the binding agent syrup of 5-20 part mixes.In mixing tank, mix.At mixing step, unreacted unslaked lime and the reaction of moisture in syrup, the result forms the lime saccharate key between them, make unslaked lime be transformed into white lime.This transformation is because the residence time of weak point is restricted in mixing tank.
Therefore, preferred, unslaked lime and syrupy mixture are grown the stirring of residence time, with by forming calcium sucrose sat linkage slaking coal agglomerate, improve the intensity of final coal agglomerate.This is stirred in kneader (kneader), carries out in a kind of sand mill (mixing mill), and is better than carrying out in mixing tank.Kneader has the columniform central shaft of vertical shape that blade has been installed.This kneader is used to stir unslaked lime and syrupy mixture.
This mixes preferred scope within 2-50 minute and carries out.During less than 2 minutes, the intensity of final coal agglomerate is bad in churning time.During greater than 50 minutes, mixture is dry in churning time, and therefore the intensity of the coal agglomerate that is shaped is bad.
Form after the stirring.Under fixation pressure, in roller press, be shaped and make the coal agglomerate.
Have when being not less than 30% moisture content at coal agglomerate of the present invention, its whereabouts intensity and thermal explosion fragility are not good.Therefore, preferably in whole technological process, moisture content is kept not being higher than 30%.
Below, describe the present invention in detail with reference to following Example.
[example 1]
To have that the dry sludge of 10% weight of the composition of listing and/or dust and granularity are not more than that 4 millimeters coal dust mixed 3 minutes or time still less in table 2.Exsiccant sludge that uses and dust satisfy goes up the impurity level shown in the table 1.By the dry exsiccant sludge that obtains in rotary kiln.
Table 2
Exsiccant sludge and dust composition (weight percent)
Sludge/dust The Fe total amount C CaO MgO Add up to
A1 42.37 25.00 2.78 0.58 70.73
C1 17.46 37.20 5.45 0.99 61.10
D1 12.13 46.80 6.00 2.30 67.23
E1 71.96 1.46 - - 73.42
F1 40.33 5.89 7.97 1.01 55.20
A1: blast furnace sludge C1: from the sludge of the water treating equipment of Steel Plant, D1: from the sludge of sewage disposal device, E1: from the dust of wire production equipment, F1: from the dust of agglomerating plant.
Weight in mixture (main ingredient) is 100 parts, and the unslaked lime that adds weight and be 3 parts is as stiffening agent.The mixture ageing that obtains 2 minutes-2 hours.Adding weight to the aged mixture of 100 parts of weight was 8% syrup binding agent, made the coal agglomerate then at stirring at room 2-50 minute.Measure whereabouts intensity, thermal explosion fragility and dynamic thermal explosion fragility.The results are shown in table 3.
Fall to measuring whereabouts intensity 4 times by the coal agglomerate that will make like this height, and be expressed as percentage (fraction) based on the coarse particles of the gross weight of ground grains and fine particle (granularity≤6.3 millimeter) at 5 meters.Coarse grained percentage calculates by following formula:
Have particle (weight percent) greater than 20 millimeters granularity+have the particle (weight percent) of the granularity of 10-20 millimeter * ( 1/ 2)
Place 1000 ℃ Reaktionsofen to obtain coal measuring the thermal explosion fragility by the coal agglomerate that will make like this, and be expressed as based on the coarse particles of the weight of the coal that obtains and fine grain percentage (granularity≤2.0 millimeter).Calculate coarse grained percentage by following formula:
Have particle (weight percent) greater than 20 mm particle sizes+have particle (weight percent) greater than 16 millimeters granularity * ( 3/ 4)+have particle (weight percent) greater than 13 millimeters granularity * ( 2/ 4)+have particle (weight percent) greater than 10 millimeters * ( 1/ 4)
Place 900 ℃ rotary oven to obtain coal by the coal agglomerate that will make like this and measure the moving burst of heat, and be expressed as based on the coarse grained percentage on the weight of the coal that obtains.
The coarse particles percentage calculates by following formula:
Greater than the particle (weight percent) of 20 millimeters granularities+greater than the particle (weight percent) of 10 mm particle sizes * ( 1/ 2)
Coarse grained percentage is big more, and fine grain percentage is more little, and these performances are good more.
</entry></row></tbody></tgroup></table></tables>
As shown in table 3, the performance of coal agglomerate of the present invention is same as or is higher than lump coal.Therefore, coal agglomerate of the present invention can be used in the molten iron production technology of using coal.
In the present invention, can be from the dust (E1) of agglomerating plant to use with coal blended form, still, it contains a large amount of unwanted components, and (S, basic metal C1) can cause technological problems.Therefore, suggestion will be from dust and other sludges or the mix dust of agglomerating plant, with the content of dilution unwanted component.At this moment, the amount of blended sludge or dust to limit by the content of unwanted component.
[example 2]
Have table 4 and list the not dry sludge and the dust of composition and be mixed with each other 3-10 minute, obtain the mixture shown in the table 5.Undried sludge shown in the use table 4 meets the impurity level shown in the above-mentioned table 1.At this moment, the sludge of weight 10% and dust mix with the coal dust of the weight 90% that is not more than 4 mm particle sizes.
Table 4
Undried sludge and dust composition (weight percent)
Sludge T.Fe C CaO MgO Amount to Moisture
A2 35.94 30.4 3.81 0.56 70.71 15.7
A3 40.40 22.4 3.90 0.57 67.27 16.3
B1 29.81 28.4 5.17 1.54 64.92 42.4
A2: blast furnace sludge (not dry), A3: blast furnace sludge (not dry), B1: the sludge (not dry) that uses the molten iron production technology of coal.
Add the stiffening agent of 3 parts of weight to the mixture (main component) of 100 parts of weight, aging 2 minutes-2 hours then.The syrup that adds 8 parts of weight to the aged mixture of 100 parts of weight.The mixture that produces is stirred 2-50 minute, makes the coal-forming agglomerate.On the other hand, except the undried sludge shown in the dry table 4, the mode identical with example 1 made the coal agglomerate.Measure the whereabouts intensity and the thermal explosion fragility of the coal agglomerate of making like this.
A2, A3 and B1 go up the sludge shown in the table 4.</entry></row></tbody></tgroup></table></tables>
As shown in table 5, use the coal agglomerate of undried sludge manufacturing to be parity with or superiority over lump coal at aspect of performance.Therefore, coal agglomerate of the present invention can be used in the molten iron production technology of using coal.
[example 3]
Not dry sludge B1 shown in the table 4 is dried, and makes moisture content in undried sludge reach and is not more than 3%.Undried sludge and granularity are not more than 4 millimeters coal dust and mix and be not more than 3 minutes.In this step, exsiccant sludge and coal dust ratio of mixture are shown in following table 6.The unslaked lime that adds 3 parts of weight to the sludge of 100 parts of weight and coal dust (main ingredient) mixture.Then with the mixture ageing that produces 2 minutes-2 hours.Aged mixture to 100 parts of weight adds the syrup of 8 parts of weight as binding agent.The mixture that produces at room temperature was stirred 2 minutes-50 minutes, made the agglomerate that produces coal.Measure the whereabouts intensity and the thermal explosion fragility of the coal agglomerate of making like this.The results are shown in following table 6.
Table 6
The content of the sludge in the coal agglomerate (%) B1 sludge (drying)
Whereabouts intensity (coarse particles per-cent) Thermal spalling (coarse particles per-cent)
????5 ????86.33 ????74.76
????10 ????70.09 ????79.16
????15 ????78.87 ????82.71
????20 ????72.38 ????89.72
From the result of table 6 as seen, though the amount of blended sludge changes, the performance of coal agglomerate does not have big variation, and coal agglomerate of the present invention can be used in the molten iron production technology of using coal.
Industrial Applicability A
As mentioned above, according to the present invention, dust and sludge, particularly undried sludge can be as the raw materials recovery utilizations of the coal agglomerate of iron-smelting process. In addition, coal agglomerate according to the present invention has good whereabouts intensity and the thermal decrepitation of conventional coal agglomerate of making than with coal.
Although disclose the preferred embodiments of the present invention in order to illustrate, those of ordinary skills understand, and not departing from the spirit and scope of the invention situation of claim, can carry out various modifications.

Claims (15)

1. coal agglomerate that smelting reduction process is used, it comprises:
As the weight of main ingredient is 50% or still less the sludge and the coal dust of its surplus, and described sludge comprises iron (Fe) or iron cpd, carbon (C), calcium cpd and magnesium compound; With
With main ingredient weight is 100 parts of notes, and weight is the binding agent of 5-20 part.
2. coal agglomerate that smelting reduction process is used, it comprises:
As the weight of main ingredient is 50% or still less the dust and the coal dust of its surplus, and described dust comprises iron (Fe) or iron cpd, carbon (C), calcium cpd and magnesium compound; With
With main ingredient weight is 100 parts of notes, and weight is the binding agent of 5-20 part.
3. coal agglomerate that smelting reduction process is used, it comprises:
As the weight of main ingredient is 50% or still less the sludge and the coal dust of dust mixture and its surplus, and described sludge and dust comprise iron (Fe) or iron cpd, carbon (C), calcium cpd and magnesium compound; With
With main ingredient weight is 100 parts of notes, and weight is the binding agent of 5-20 part.
4. the coal agglomerate of using according to the smelting reduction process of claim 1 or 3, wherein sludge is to contain 50% or the not dried forms of moisture still less.
5. the coal agglomerate of using according to any one smelting reduction process of claim 1-3, wherein sludge or dust contain following impurity: 2.0% or Zn still less, 2.0% or basic metal still less, 1.0% or S still less, 1.0% or P still less, 6.0% or Al still less 2O 3And 1.0% or Cl still less.
6. the coal agglomerate of using according to the smelting reduction process of claim 5, wherein said sludge are from from the sludge of ironworks blast furnace, from the sludge of the molten iron manufacturing process of using coal, at least a from what select the sludge of the water treating equipment of Steel Plant and the sludge from sewage disposal device.
7. the coal agglomerate of using according to the smelting reduction process of claim 5, wherein said dust comprises the dust from wire production equipment.
8. the coal agglomerate of using according to any one smelting reduction process of claim 1-3, wherein the weight total content of iron (Fe) or iron cpd, carbon (C), calcium cpd and magnesium compound be sludge or dust dry weight 30% or more.
9. according to any one melting and reducing coal agglomerate of claim 1-3, wherein said binding agent is a syrup.
10. according to any one melting and reducing coal agglomerate of claim 1-3, also comprising, is 100 parts in main ingredient weight, and weight is 5 parts or stiffening agent still less.
11. according to any one melting and reducing coal agglomerate of claim 1-3, wherein said stiffening agent is a unslaked lime.
12. a method of making the coal agglomerate that smelting reduction process uses may further comprise the steps:
Mixing as main ingredient, weight be 50% or still less sludge and dust in the coal dust of at least a and its surplus, sludge and dust comprise iron (Fe) or iron cpd, carbon (C), calcium cpd and magnesium compound;
With main ingredient weight is 100 parts of notes, and the syrup that adds weight and be 5-20 part is as binding agent, and stirs; With
The mixture that shaping obtains.
13. the method for the coal agglomerate of using according to the manufacturing smelting reduction process of claim 12 is to contain 5% or still less during the dried forms of moisture at sludge wherein, carries out 3 minutes or less time with mixing of coal dust.
14. the method for the coal agglomerate of using according to the manufacturing smelting reduction process of claim 12 is when containing the not dried forms of 5-50% moisture at sludge wherein, carries out 3-10 branch clock time with mixing of coal dust.
15. the method for the coal agglomerate of using according to the manufacturing smelting reduction process of claim 12, also be included in add binding agent before, to the main ingredient of 100 parts of weight add weight be 5 parts or still less unslaked lime as stiffening agent, and wear out.
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WO2004020555A1 (en) 2004-03-11
BR0306210A (en) 2004-08-24
RU2004115736A (en) 2005-03-27
AU2003228122A1 (en) 2004-03-19
RU2264435C2 (en) 2005-11-20
AU2003228122B2 (en) 2008-09-25
CN1328358C (en) 2007-07-25

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