CN101531907A - Method for manufacturing coke - Google Patents
Method for manufacturing coke Download PDFInfo
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- CN101531907A CN101531907A CN200910003893A CN200910003893A CN101531907A CN 101531907 A CN101531907 A CN 101531907A CN 200910003893 A CN200910003893 A CN 200910003893A CN 200910003893 A CN200910003893 A CN 200910003893A CN 101531907 A CN101531907 A CN 101531907A
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- coal
- coke
- manufacture method
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/04—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
- C10B53/04—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of powdered coal
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/007—Conditions of the cokes or characterised by the cokes used
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Abstract
Provided is a method for manufacturing coke, capable of implementing a high coke strength even through the bovey coal being used as the raw material coal for manufacturing the coke. The method for manufacturing the coke includes the following procedures: a procedure of mixing a ash-free coal of above to 0.05 mass share and less than 0.50 mass shares, and a faulty coal containing carbon by above to 70.0% and less than 85.0% by one mass share to obtain a mixing coal; a procedure of forming the mixing coal to obtain a formed coal; a procedure of heating the formed coal at a temperature above to a softening beginning temperature of the ash-free coal to obtain a heat-treatment coal; a procedure of comminuting the heat-treatment coal to obtain a comminuting coal; and a procedure of drying and distilling a mixed coal containing the comminuting coal and a strong cementing coal containing carbon by above to 85.0% and less than 91.0%. it is also able to select the bovey coal as the faulty coal.
Description
Technical field
The present invention relates to the manufacture method of the high coke of employed intensity such as blast furnace process ironmaking.
Background technology
Use employed coke for ironmaking, except requiring to be used to guarantee the air permeability in the blast furnace, it is also high to go back desired strength.In general be to make coke, and, then use strong caking coal, but strong caking coal is expensive in coal, thereby its usage quantity is cut down in expectation in order to implement its high strength by the destructive distillation coal.If noncaking coal and little caking coal etc. and strong caking coal are allocated,, must look after the reduction of cutting down the coke strenth of bringing along with its usage quantity though can cut down the usage quantity of the strong caking coal of high price.
Pack into the method for the coal in the coke-fired furnace of the reduction of the amount of moisture of coal and compacting mechanically, known have the tamped density of the coal of raising in coke-fired furnace, and this can make the coke high strength.But, when adopt reducing amount of moisture, the problem that exists the micro mist of coal to disperse easily, the operation of another kind of compacting is then very complicated.
In patent documentation 1, disclose the other technologies that are used to obtain high-intensity coke.This technology is to make pitch (asphalt), pitch (asphalt pitch), liquidation of coal handle cohesiveness that residue, solvent generate charcoal etc. to replenish material and contain and be immersed in the not surface of the particulate raw material of wood-charcoal of softening meltbility, and it is mixed with coal.
In addition, the applicant has carried out the patent application about the high strength coke, and its content is disclosed in the patent documentation 2,3.Patent documentation 2 is disclosed to be, with respect to containing the coal of carbon content rate more than 85%, below 91%, with carbon content rate more than 60%, be lower than this coal 100 mass parts of 85% coal, contain below coal 1 mass parts that does not contain ash content in fact, with its as coke manufacturing use with coal.On the other hand, patent documentation 3 is disclosed to be, with respect to coke production of raw material for use coal 100 mass parts, adds and does not contain in fact below coal 1 mass parts of ash content.
As above-mentioned, the usage quantity of both the having cut down strong caking coal high-intensity coke of getting back becomes the problem of coke in making, though to solve this problem is that purpose uses cohesiveness such as pitch, coal tar or ashless coal to replenish material, but, go up with difficulty so cut down the existing side by side of high strength of (a large amount of uses of the coal beyond the strong caking coal) and coke in the usage quantity of strong caking coal because cohesiveness is replenished the effect complexity of material.
In addition, the iron and steel demand sharply increase in recent years along with emerging nations such as the nations of China and Indias is contemplated to the usage quantity that must cut down cohesiveness and little close-burning bituminous coal and little cohesiveness and cohesionless sub-bituminous coal.If as anticipation, the foreseeable future, will produce the necessity of using more low-grade coals such as brown coal.
[patent documentation 1] spy opens communique 2001-No. 40363
[patent documentation 2] spy opens communique 2007-No. 23190
[patent documentation 3] spy opens communique 2007-No. 246674
Summary of the invention
The present invention In view of the foregoing, its purpose is to provide a kind of manufacture method of coke, even brown coal are used for coke with making feed coal, also can realize high coke strenth.
If use brown coal as coke production of raw material for use coal, then be difficult to realize high coke strenth, in order still to obtain high-intensity coke in this case, present inventor etc. are for correlation technique research with keen determination repeatedly.It found that, if carry out mixing, the shaping of the low grade coal of ashless coal and brown coal etc., carry out above heating, the pulverizing of softening beginning temperature of ashless coal, and destructive distillation contains the mixed coal of chippy coal, then can access high-intensity coke, thereby finish the present invention.
Promptly, the manufacture method of coke of the present invention, wherein, have following operation: with more than ashless coal 0.05 mass parts, below 0.50 mass parts and carbon content rate (d.a.f.) be more than 70.0%, be lower than 85.0% low grade coal 1 mass parts and mix the mixed processes that obtains mixing coal; Be shaped described mixing coal and the forming process of the coal that obtains being shaped; Described shaping coal is heated to the heating process that obtains the thermal treatment coal more than the softening beginning temperature of described ashless coal; Pulverize described thermal treatment coal and obtain the pulverizing process of comminuted coal; Destructive distillation contains described comminuted coal and carbon content rate (d.a.f.) is the cooperation coal carbonization operation of the strong caking coal more than 85.0%, below 91.0%.
In the present invention, so-called " ashless coal " is during ashing, to be the coal of (quality standard) below the 5000ppm with 815 ℃ of heating coals in the ashless coal of ash content before heating as residual inorganics.In addition, so-called " low grade coal " meaning is, is more than 70.0%, is lower than 85.0% coal as the carbon content rate (d.a.f.) of above-mentioned regulation, and carbon content rate (d.a.f.) is more than 70.0%, be lower than 78.0% brown coal also meets low grade coal.
The ashless coal in the mixing coal that uses in the described forming process and the granularity of low grade coal all are preferably below the 0.5mm, and in addition, preferably obtaining apparent density is 0.80g/cm
3More than, be lower than 1.00g/cm
3The shaping coal.Preferably more than the 80 quality % of the comminuted coal that obtains by pulverizing process its granularity below 3mm.The mixed coal that uses in the destructive distillation operation, the fit rate of preferred powder broken coal are more than the 5 quality %.
The coke that obtains with the manufacture method of coke of the present invention preferably uses as the ironmaking that is used to make the pig iron.
Manufacture method according to coke of the present invention, because be the mixed coal that destructive distillation contains comminuted coal and strong caking coal, each operation of the shaping of the mixing coal that this comminuted coal constitutes through ashless coal and low grade coal by specified amount, the heating more than the softening beginning temperature of ashless coal, pulverizing and obtaining, even so carry out that the usage quantity of strong caking coal is cut down and during STRENGTH ON COKE raw material employing brown coal, also can access the high coke of intensity.
Description of drawings
Fig. 1 is the figure that is used to illustrate an example of the device that is used to make ashless coal.
Nomenclature
1 container
2 pumps
3 preheaters
4 extraction tanks
5 gravity settling tanks
6 sediment receptacles
7 filter members
8 filtering units
9 supernatant liquor receptacles
10 stirrers
Embodiment
(manufacture method of tar production of raw material for use coal)
The manufacture method of coke of the present invention is a mixed coal of handling comminuted coal and strong caking coal by the destructive distillation operation, and this comminuted coal obtains through mixed processes, forming process, heating process, pulverizing process.Below describe in detail for each operation.
Mixed processes:
In mixed processes, obtain being mixed with the mixing coal of the low grade coal of the ashless coal of specified amount and specified amount.
Ashless coal is the coal that demonstrates high workability and high adhesion when heating, for the cohesiveness of mixing in the coal is replenished material.This ashless pit ash is 5000ppm following (quality standard, down together), is preferably below the 2000ppm.At this what is called " ash content ", the meaning is the residual inorganics during with 815 ℃ of heating coals and ashing, and this inorganics has silicic acid, aluminium nitride, ferric oxide, lime, magnesium oxide, basic metal etc.Also have, though ash content self STRENGTH ON COKE characteristic is not influence almost, but the ash content in the manufacturing of aftermentioned ashless coal is sneaked into sneaking into of the coal (not dissolving coal) that means after the coal constituent extraction, and does not dissolve the bonding that coal can hinder mixed coal, has the character that reduces coke strenth.Therefore, ashless pit ash is preferably below above-mentioned numerical value.
Its high fluidity (logMF) of being confirmed by the Ji Shi fluidity test according to the Ji Shi plastometer method (GieselerPlastometer) of JIS M8801 defined of preferred ashless coal is more than as 4.0 (logddpm) that measure boundary.In addition, solidification value surpasses 450 ℃ the preferred ashless coal of also conduct.
Be used to obtain the method for ashless coal, can adopt the manufacture method of known ashless coal.For example, utilize the just manufacturing of suitable ashless coal of extraction of the coal constituent of organic solvent.
The coal that uses in the manufacturing of ashless coal is not particularly limited to bituminous coal, sub-bituminous coal, brown coal etc., also is not particularly limited for its carbon content rate in addition.Promptly, also can use carbon content rate (d.a.f) to be more than 60%, be lower than 95.0% coal, but there is exhausted problem in it for strong caking coal, so preferably use carbon content rate (d.a.f) to be more than 60.0%, to be lower than 85.0% coal, more preferably use carbon content rate (d.a.f) to be more than 70.0%, be lower than 85.0% coal.
Use carbon content (d.a.f) 60.0% or more, when being lower than 95.0% coal and making ashless coal, the high fluidity of the preferred volatile matter of this coal, average reflectance, Ji Shi, total inertinite (totalinertinite) are as follows.Volatile matter is preferably more than 30%, below 40% by the decision of the method for JIS M8812 defined, more preferably more than 32%, below 36%.Average reflectance is preferably more than 0.6, below 1.0% by the decision of the method for JIS M8816 defined, more preferably more than 0.8, below 0.9.The high fluidity (logMF) of Ji Shi be preferably 3.0 (logddpm) above, below 4.5 (logddpm), more preferably 3.3 (logddpm) above, below 3.6 (logddpm).Add up to inertinite to be preferably more than 5%, below 35%, more preferably more than 15%, below 20%.Add up to inertinite about this, be among the analytical value of the coal micro organization composition (micropetrological unit maceral) of JIS M8816, the ratio that adopts semifusinite (semifusinite) and micro organization become the to hive off ratio of (micropetrological unit group) is calculated with following formula.
[formula 1]
Revisal inertinite=inertinite-semifusinite % * 1/3
In the following formula, MM (mineral matter) means mineral substance, and A means ash content (butt is measured with JIS M8812), and S means total sulphur branch (butt is measured with JIS M8813).
In order to carry out the extraction of coal constituent expeditiously, when this extracts, preferably coal is ground into below the 5mm in advance.
In the employed organic solvent of the manufacturing of ashless coal, can use as inferior one or more organic solvent: the monocyclic aromatics of benzene,toluene,xylene etc.; Naphthalene, methylnaphthalene, dimethylnaphthalene, trimethyl-naphthalene, diphenyl, has the bicyclic-aromatic compound of the diphenyl etc. of aliphatic lateral chain or aromatic substituents; Tricyclic etc.But when using monocyclic aromatics, the percentage extraction of coal constituent is low, and when improving extraction temperature in order to improve percentage extraction, the pressure that is used to be set under this temperature uprises.In addition, when using tricyclic,, therefore separate the organic solvent difficulty from coal owing to there is the high this general tendency of the boiling point of this compound.Therefore, preferably use bicyclic-aromatic compound.Its boiling point of preferred bicyclic-aromatic compound is 180～330 ℃.
Also having, is the hydrogen supply dissolvent of the employed tetralin of liquifying method etc. of coal if use known, coal can be dissolved or liquefy, thereby can realize the high percentage extraction of coal constituent, but the hydrogen atom of hydrogen supply dissolvent can move on the formation molecule of coal.Therefore, can not select the hydrogen supply organic solvent, but preferably select non-hydrogen supply organic solvent to carry out the extraction of coal constituent.
Utilize the extraction of the coal constituent that organic solvent carries out, be coal is mixed with organic solvent and to modulate slurry, thereby carry out the extraction of coal constituent, thereafter,, then obtain ashless coal if remove organic solvent from the liquid portion of supernatant liquor of slurry etc.
Coal concentration in the slurry is advisable with 10～35 quality %, and the heating slurry can extract coal constituent.This extraction conditions for example heats slurries with 300～420 ℃ and kept 5～120 minutes.Under than 300 ℃ of low temperature, can not fully weaken the intermolecular combination of formation of coal, so the percentage extraction of coal constituent is low, under than 420 ℃ of high temperature, the thermolysis base that takes place because of the pyrolysis of coal can combine with coal again, so the percentage extraction of coal constituent is still low.On the other hand, under 300～420 ℃ temperature, because the formation of coal is intermolecular in conjunction with loose, and gentle thermolysis taking place, therefore can reach the percentage extraction of coal constituent.In addition, about the pressure in the extraction, it is adjusted into can not makes organic solvent reach boiling point, be generally 0.8～2.5MPa, the atmosphere during extraction is that rare gas element (for example nitrogen) atmosphere gets final product.
After the extraction of coal constituent, before carrying out the removing of organic solvent, need be from the coal behind the organic solvent separating and extracting.This separates the known separation method of employing and gets final product.As this known detaching direction, for example can enumerate settling process, filtration method, because the filtration velocity of strainer is restricted, therefore preferably adopt settling process in the filtration method in order to separate a large amount of coals.Also have, the separating out etc. of the coal constituent in the organic solvent, the temperature of removing coal from slurry preferably sets temperature identical with extraction the time, about pressure too.
Fig. 1 is the figure that is used to illustrate an example of the device that is used to make ashless coal.In container 1, coal and organic solvent are mixed and generate slurry, and this slurry is sent by pump 2, is heated to the temperature of regulation during by preheater 3, is fed into extraction tank 4.In extraction tank 4, stir on one side slurry is stirred machine 10, Yi Bian coal constituent by organic solvent extraction, slurry is fed into gravity settling tank 5 afterwards.In gravity settling tank 5, the coal after composition is extracted is along the direction sedimentation of diagram arrow 11, and the supernatant liquor of giving birth in the power subsider 5 is fed into filtering unit 8, and sediment is reclaimed by receptacle 6 on the other hand.The filter member of being located in the supernatant liquor quilt in the filtering unit 87 filters, and filtrate is reclaimed by supernatant liquor receptacle 9.Then, organic solvent is evaporated from the filtrate that is recovered remove, obtain ashless coal thus.As the method that organic solvent is removed in evaporation, use general drying meanss such as spray-drying process, distillation method, boulton process and get final product.
The coal that meets " low grade coal " among the present invention has caking coal, little caking coal, noncaking coal, brown coal.And be not to be used for clear and definite specificator should the general standard of each coal of low grade coal and other coals.So in the present invention, carbon content rate (d.a.f.) is a hard coal above 91.0% coal, carbon content rate (d.a.f.) is more than 85.0%, coal below 91.0% is strong caking coal, carbon content rate (d.a.f.) is more than 83.0%, being lower than 85.0% coal is caking coal, carbon content rate (d.a.f.) is more than 80.0%, being lower than 83.0% coal is little caking coal, carbon content rate (d.a.f.) is more than 78.0%, being lower than 80.0% coal is noncaking coal, carbon content rate (d.a.f.) is more than 70.0%, being lower than 78.0% coal is brown coal, it is mud coal that carbon content rate (d.a.f.) is lower than 70.0% coal.That is because caking coal, little caking coal, noncaking coal and brown coal meet the low grade coal among the present invention, so this low grade coal be carbon content rate (d.a.f.) more than 70.0%, be lower than 85.0% coal.Also have, the carbon content rate (d.a.f.=dry ash free) of standard that becomes the classificationization of coal is meant the containing ratio (quality %) of the organic matter of the moisture of removing coal and ash content, and it can be measured according to JIS M8819.
Usage quantity when mixing ashless coal and low grade coal is that more than ashless coal 0.05 mass parts, below 0.50 mass parts, low grade coal is 1 mass parts.If it is ashless coal is lower than 0.05 mass parts, then insufficient based on close-burning effect.On the other hand, if ashless coal surpasses 0.50 mass parts,, superfluous based on close-burning effect in addition then because ashless coal is more expensive and uneconomical than low grade coal.That is, the amount of ashless coal can not improve coke strenth outside above-mentioned scope the time.The amount of the ashless coal when low grade coal is 1 mass parts is preferably more than 0.15 mass parts, below 0.30 mass parts.
, in the destructive distillation (cokeization) of coal, the fusion of known meeting generation coal, softening, and generate the volatile matter that brings because of thermolysis, have the intensity of appropriateness and the coke generation of void content concurrently.Low grade coal lacks meltbility and cohesiveness, a destructive distillation low grade coal and the intensity of the coke that obtains is low.Particularly about a kind of brown coal as low grade coal, it does not have meltbility and tackiness, and the destructive distillation brown coal also only can generate crisp carbon.To contain through mixed processes, forming process, heating process, pulverizing process and the mixed coal of the comminuted coal that obtains when carrying out destructive distillation as the manufacture method of coke of the present invention, present inventors etc. also find, ashless coal in the comminuted coal in the destructive distillation operation has brown coal bonded ability in addition each other, but during the distance between the brown coal, this binding ability is not in full use, thereby can not obtain the coke that intensity is higher, void content is suitable.That is,, preferably make ashless coal and low grade coal miniaturization in order to make the higher coke of intensity.Miniaturization can be listed below mode: for example before the mixing of carrying out ashless coal and low grade coal, use known shredding units such as impactor, jaw crusher, jet mill to pulverize; When mixing ashless coal and low grade coal, pulverize.
The granularity of ashless coal and low grade coal, if its pulverized then be not particularly limited, but preferably all below 0.5mm, more preferably below 0.2mm.This granularity by can decide by the sieve of mesh of regulation (below, the determining method of granularity is identical.)。For example the granularity of the ashless coal of the sieve by mesh 0.5mm is below the 0.5mm.If the low grade coal ashless coal on every side that the granularity that makes ashless coal below 0.5mm, is then mixed in the coal distributes well, can make the higher coke of intensity.In addition, if the granularity that makes low grade coal below 0.5mm, then the higher coke of intensity can be made in the inside that cohesiveness can fully be given through low grade coal in heating process therefore.
Forming process:
By set to form mixing coal obtain being shaped this operation of coal, the distance between ashless coal and the low grade coal shortens, and can realize high-intensity coke.In order to realize more high-intensity coke, suitable setting is shaped and presses, and makes the apparent density optimizing of the index of the length that constitutes the distance between ashless coal and the low grade coal.The apparent density of this preferred shaping coal is 0.80g/cm
3More than, be lower than 1.00g/cm
3, 0.85g/cm more preferably
3More than, 0.95g/cm
3Below.Apparent density is lower than 0.80g/cm
3The time, therefore ashless coal and long with the distance of low grade coal is not suitable for making the higher coke of intensity, also leaves the inadequate point of processing of shaping coal in addition.On the other hand, if at 1.00g/cm
3Below then too dense, insufficient from gas outflow in the shaping coal in the heating treatment step process, shaping coal self-destruction in this process, it is uneconomical to improve the pressure that is shaped in addition.
Heating process:
In heating process, heating shaping coal and obtain the thermal treatment coal.In this operation,, and the temperature of ashless coal is heated to more than its softening temperature (being generally 300 ℃) for hot melt property and the cohesiveness that makes the ashless coal in the shaping coal carries out the transition on the low grade coal.Thus, the ashless coal that has liquefied merges with low grade coal easily, the formation molecular activityization of ashless coal and low grade coal in addition, the interaction reinforcement of each molecule.The softening beginning temperature of ashless coal is the softening beginning temperature that the Ji Shi fluidity test is measured, and can be than the high temperature of its softening beginning temperature by the temperature of the ashless coal of heating setpoint, preferably than high about 10～30 ℃ temperature of softening beginning temperature.If to surpass the temperature heating of (softening beginning temperature+30 ℃), then gas sharply takes place in the shaping coal, there is the outward appearance of shaping coal to be out of shape to such an extent that almost lose the situation of original shape.
Be to get final product with interior in 30 minutes heat-up time (the shaping coal reaches the time after the design temperature), is preferably in 10 minutes.This is because if carry out long heat treated, the cohesiveness of the thermal treatment coal that then obtains reduces.
Pulverizing process:
In pulverizing process, pulverize the thermal treatment coal and obtain the comminuted coal of granularity arbitrarily.The particle diameter of comminuted coal is unfavorable for obtaining more high-intensity coke greatly.Therefore, for the coke of realizing that intensity is higher, preferably adjust pulverization process, the above granularity of 80 quality % that makes comminuted coal is below 3mm.This preferred reason is thought owing in the process of destructive distillation operation, moderately dispersions such as strong caking coal are arranged around the comminuted coal.
In order to heat-treat the pulverizing of coal, use known shredding units such as impactor, jaw crusher, jet mill to get final product.
The destructive distillation operation:
In the destructive distillation operation, allotment comminuted coal and the strong caking coal that carried out suitable pulverizing, the synthetic mixed coal of destructive distillation and obtain coke.Be used to modulate the coal of mixed coal, also can use comminuted coal, strong caking coal other coals in addition, but preferably only use comminuted coal and strong caking coal.
The fit rate of the comminuted coal in the mixed coal is to get final product more than the 5 quality %, and according to the strong caking coal that cooperates and the intensity of desired coke, the fit rate of comminuted coal is reached more than the 50 quality %.If be lower than 5 quality %, then the meaning of the usage quantity of strong caking coal reduction reduces, and uneconomical.When the use level of comminuted coal is too much, the tendency that has coke strenth to reduce, coke strenth that realizes for taking into account in addition and economy, the use level of comminuted coal are below the 50 quality %, by being about 30 quality %.
Some mixed coals that heat up in a steamer, then softening, the fusion of mixed coal, solidify again, the coke generation.Condition in this destructive distillation is not specially limited, and can adopt the common destructive distillation condition of using coke-fired furnace.Temperature condition for example is more than 950 ℃, below 1200 ℃, and more preferably more than 1000 ℃, below 1050 ℃, the destructive distillation time for example is more than 8 hours, below 24 hours, more preferably more than 10 hours, below 20 hours.
(manufacture method of the pig iron)
The coke that obtains can be used as ironmaking and uses as known to always.That is, can be used in the manufacturing of the pig iron.Described coke is because excellent strength, so also be suitable for the pig iron manufacturing in the blast furnace.And, because the intensity height of coke, so can realize the air permeability of the excellence in the blast furnace.Also have, the manufacture method of the pig iron in the blast furnace adopts known method to get final product, and for example can be listed below method: making iron ore and coke interaction cascading in blast furnace respectively is stratiform, by bottom drum hot blast, the spray feed fine coal as required of blast furnace.
[embodiment]
Below enumerate embodiment etc. and be described more specifically the present invention, but the present invention is not limited by following embodiment, also can the suitable change of the scope of aim described later implement before meeting, these all are included in the technical scope of the present invention.Also have, among following reference example, the manufacture method of coke according to the invention, the intention of this method except not from the present invention.
(ashless coal)
Mixed and modulated slurry with bituminous coal (carbon content rate (d.a.f) 83.2%) 5kg with as the 1-methylnaphthalene of bicyclic-aromatic compound (chemistry society of Nippon Steel system) 20kg.In autoclave through the internal volume 30L of nitrogen purging, handle slurry with 1.2MPa, 370 ℃, 1 hour condition, utilize bicyclic-aromatic compound to carry out the extraction of bituminous coal composition.In, gravity settling tank with the condition of pressure synthermal with this extraction, slurry is separated into supernatant liquor and solid shape is divided concentrated solution, then, from supernatant liquor, separate, reclaim bicyclic-aromatic compound by distillation method, obtaining residue is ashless coal.Ashless coal output is 2.7kg, and ash content is 900ppm.In addition, be 305 ℃ from the softening beginning temperature of the Ji Shi fluidity test of ashless coal, high fluidity is 4.7 (logddpm).
(low grade coal)
It is the brown coal that Indonesia of 71.1% produces that use is pulverized carbon content rate (d.a.f) with impactor.
(strong caking coal)
It is the strong caking coal that Russia of 91.6% produces that use is pulverized carbon content rate (d.a.f) with impactor.Strong caking coal after the pulverizing is more than the 80 quality % below its granularity 1mm.
(manufacturing of coke)
Mixing low grade coal and softening beginning temperature are that 305 ℃ ashless coal obtains mixing coal, and the mixing coal of packing in the round shape die cavity (cavity) of diameter 30mm, long 50mm at room temperature carries out press molding (details of condition are with reference to aftermentioned table 1).The shaping coal that heating obtains in rare gas element (nitrogen) atmosphere is pulverized the thermal treatment coal that obtains with impactor, obtains comminuted coal (details of condition are with reference to aftermentioned table 1).
Allotment comminuted coal and strong caking coal and modulate mixed coal (about use level with reference to aftermentioned table 1.)。In the can container of wide 378mm * long 121mm * high 114mm size, fill above-mentioned mixed coal.Again in the retort (retort) of steel (size: wide 380mm * long 430mm * high 350mm) arrange and put into 4 of this can container, in the sandwich heating formula electric furnace that can on width, heat this can container, put into described retort, the destructive distillation mixed coal.At this moment destructive distillation condition is 1000 ℃, 10 hours, takes out retort from electric furnace, spends about 16 hours and puts cold naturally.
Take out 4 can container from the retort of putting naturally after cold, cutting is equivalent to half the coke of 189mm part of width down.Carry out when sandwich heating, the place that is equivalent to the width center is called as the carbon core, the coke that quilt from hot face to the carbon core burns till, from place near hot face, be called as head, body, tail successively, the difference of known excuse, body, the heat-up rate of tail when heating causes intensity to produce difference.Therefore, from being equivalent to half head, body, each position that is divided into about 60mm of portion of coke of 189mm part of width, downcut the cardinal principle rectangular parallelepiped (: about 20mm ± 1mm), obtained being carried out the coke of granulation on one side.With the coke that peace and quiet this quilt of distilled water is granulated, remove the micro mist of the coke that (during cutting) adheres to when granulating, carry out drying with 150 ℃ ± 2 ℃ drying machines.
(coke strength index)
As the strength detection sample, measure I type intensity (coke strength index) with above-mentioned cleaning, dried coke.At the device that is used for the strength trial of I type, container cylindraceous (the long 720mm that use is made by the SUS material, the bottom surface diameter 132mm of circle), in this container, put into strength detection sample 200g, rotating speed with 20 weeks in 1 minute adds up to rotatablely moving of 600 weeks, and the impact that brings thus is applied on the sample.The rotation of this cylinder is to be provided with turning axle in the place of the 360mm of the center that is equivalent to drum length 720mm, is that the center is rotated cylinder with this turning axle, makes the bottom surface of cylinder draw the circle of diameter 720mm.After applying the impact that the rotation in 600 weeks of regulation brings, take out sample, with the sieve screening of the mesh of 9.5mm and measure quality on the sieve from this container cylindraceous.At this moment, the sieve that also is considered as that is embedded in the sieve is gone up and quality measurement.I type intensity refers to that account form is as follows.
I type intensity index DI
600 9.5=100 * 9.5mm sieve (unit: g)/200g that improves quality
In following table 1, creating conditions of coke strength index and coke shows in the lump.
[table 1]
A) ashless coal is with respect to the use level of the low grade coal of 1 mass parts
Low grade coal: use
Coal
Can confirm following content by table 1.
(1) according to comparative example 1,2, if outside the scope of ashless coal amount more than 0.05 mass parts, below 0.50 mass parts in the forming process, then can not realize high intensity.
(2) according to comparative example 3～5, the heating that is lower than softening beginning temperature in the omission of forming process, the heating process, the omission of pulverizing process are not suitable for the realization of high coke.
(3), in heating process,, then can not realize the coke of optimal intensity if heat with the high 30 ℃ temperature of softening beginning temperature (305 ℃) than ashless coal according to embodiment 1 and reference example 1.
(4) according to embodiment 1 and reference example 2, its granularity of low grade coal and ashless coal all is preferably below the 0.5mm.
(5) according to embodiment 1 and reference example 3,4, the apparent density of the shaping coal that is obtained by forming process is with 0.80g/cm
3More than, be lower than 1.00g/cm
3Be advisable.
Claims (8)
1. the manufacture method of a coke is characterized in that, has following operation:
With the carbon content rate (d.a.f.) of ashless coal below 0.50 mass parts more than 0.05 mass parts and 1 mass parts is to be lower than 85.0% low grade coal more than 70.0% to mix the mixed processes that obtains mixing coal:
The described mixing coal that is shaped obtain the being shaped forming process of coal;
Described shaping coal is heated to the heating process that obtains the thermal treatment coal more than the softening beginning temperature of described ashless coal;
Pulverize the pulverizing process that described thermal treatment coal obtains comminuted coal;
To containing described comminuted coal and carbon content rate (d.a.f.) is that the mixed coal of the strong caking coal below 91.0% more than 85.0% carries out pyrogenous destructive distillation operation.
2. the manufacture method of coke according to claim 1 is characterized in that, described low grade coal is that carbon content rate (d.a.f.) is at the brown coal that are lower than 78.0% more than 70.0%.
3. the manufacture method of coke according to claim 1 is characterized in that, the ashless coal in the mixing coal that uses in the described forming process and the granularity of low grade coal are below the 0.5mm.
4. the manufacture method of coke according to claim 1 is characterized in that, in described forming process, obtaining apparent density is 0.80g/cm
3More than be lower than 1.00g/cm
3The shaping coal.
5. the manufacture method of coke according to claim 1 is characterized in that, the granularity more than the 80 quality % in the comminuted coal that is obtained by described pulverizing process is below 3mm.
6. the manufacture method of coke according to claim 1 is characterized in that, the fit rate of the comminuted coal in the mixed coal in the described destructive distillation operation is more than the 5 quality %.
7. according to the manufacture method of each described coke in the claim 1～6, it is characterized in that, be used as ironmaking and use.
8. the manufacture method of a pig iron is characterized in that, the coke that uses the manufacture method by the described coke of claim 7 to obtain.
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| JP2008060103A JP5280072B2 (en) | 2008-03-10 | 2008-03-10 | Coke production method |
| JP2008060103 | 2008-03-10 | ||
| JP2008-060103 | 2008-03-10 |
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| CN2012101520837A Division CN102653684A (en) | 2008-03-10 | 2009-02-12 | Method for producing coke |
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| CN101531907B CN101531907B (en) | 2012-10-03 |
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| CN2009100038934A Expired - Fee Related CN101531907B (en) | 2008-03-10 | 2009-02-12 | Method for manufacturing coke |
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| JP (1) | JP5280072B2 (en) |
| KR (1) | KR101029405B1 (en) |
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Cited By (4)
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| CN104185783A (en) * | 2012-03-27 | 2014-12-03 | 杰富意钢铁株式会社 | Method for evaluating inter-coal adhesion |
| CN104428398A (en) * | 2012-07-06 | 2015-03-18 | 株式会社神户制钢所 | Coke and method for producing same |
| CN105765034A (en) * | 2013-12-04 | 2016-07-13 | 株式会社神户制钢所 | Method for producing coke, and coke |
| CN111914221A (en) * | 2020-08-25 | 2020-11-10 | 武汉钢铁有限公司 | Process adjustment method for reducing mass percentage of coke with particle size of more than 60mm |
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| JP4939466B2 (en) * | 2008-03-10 | 2012-05-23 | 株式会社神戸製鋼所 | Solid-liquid separation device, solid-liquid separation method, and method for producing ashless coal |
| JP5280072B2 (en) * | 2008-03-10 | 2013-09-04 | 株式会社神戸製鋼所 | Coke production method |
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| KR102023065B1 (en) * | 2017-12-19 | 2019-09-19 | 주식회사 포스코 | Coal briquettes with high strength and method for manufacturing the same |
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| KR800001640B1 (en) * | 1976-04-09 | 1980-12-31 | 마쓰모도 게이신 | Process for preparing coke of high quality |
| JPS53121003A (en) * | 1977-03-17 | 1978-10-23 | Nippon Steel Corp | Production of metallurgical coke |
| JPS54108804A (en) * | 1978-02-15 | 1979-08-25 | Nippon Steel Corp | Production of coke for shaft furnace |
| JPS5767686A (en) * | 1980-10-14 | 1982-04-24 | Sumikin Coke Co Ltd | Production on coke for blast furnace |
| CN1077912C (en) * | 1999-11-26 | 2002-01-16 | 山西千熺型焦科技有限公司 | Shaped coke produced win non-adhesive coal and its prodn. method |
| JP2002121568A (en) | 2000-10-13 | 2002-04-26 | Nippon Steel Corp | Process for manufacturing coke by agglomerating charcoal |
| JP4295544B2 (en) * | 2003-04-09 | 2009-07-15 | 株式会社神戸製鋼所 | Method for producing reformed coal for metallurgy, and method for producing slag containing reduced metal and non-ferrous metal oxide using reformed coal for metallurgy |
| JP2005179494A (en) | 2003-12-19 | 2005-07-07 | National Institute Of Advanced Industrial & Technology | Auxiliary coal for raw coal for producing coke |
| JP2006070183A (en) * | 2004-09-02 | 2006-03-16 | Kobe Steel Ltd | High quality modified coal material product |
| JP4109686B2 (en) * | 2005-07-19 | 2008-07-02 | 株式会社神戸製鋼所 | Coke manufacturing method and pig iron manufacturing method |
| JP5280072B2 (en) * | 2008-03-10 | 2013-09-04 | 株式会社神戸製鋼所 | Coke production method |
-
2008
- 2008-03-10 JP JP2008060103A patent/JP5280072B2/en not_active Expired - Fee Related
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Also Published As
| Publication number | Publication date |
|---|---|
| KR20090097099A (en) | 2009-09-15 |
| CN102653684A (en) | 2012-09-05 |
| JP2009215421A (en) | 2009-09-24 |
| JP5280072B2 (en) | 2013-09-04 |
| CN101531907B (en) | 2012-10-03 |
| KR101029405B1 (en) | 2011-04-14 |
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