CN115612760B - Low-ash high-strength iron coke and preparation method thereof - Google Patents
Low-ash high-strength iron coke and preparation method thereof Download PDFInfo
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- CN115612760B CN115612760B CN202110787540.9A CN202110787540A CN115612760B CN 115612760 B CN115612760 B CN 115612760B CN 202110787540 A CN202110787540 A CN 202110787540A CN 115612760 B CN115612760 B CN 115612760B
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- 239000000571 coke Substances 0.000 title claims abstract description 109
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims description 114
- 229910052742 iron Inorganic materials 0.000 title claims description 51
- 238000002360 preparation method Methods 0.000 title abstract description 32
- 239000003245 coal Substances 0.000 claims abstract description 145
- 239000000843 powder Substances 0.000 claims abstract description 55
- 238000004939 coking Methods 0.000 claims abstract description 49
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000010426 asphalt Substances 0.000 claims abstract description 44
- 238000002156 mixing Methods 0.000 claims abstract description 28
- 238000003763 carbonization Methods 0.000 claims abstract description 17
- 238000005303 weighing Methods 0.000 claims abstract description 14
- 238000011068 loading method Methods 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 238000007599 discharging Methods 0.000 claims abstract description 12
- 238000010791 quenching Methods 0.000 claims abstract description 12
- 230000000171 quenching effect Effects 0.000 claims abstract description 12
- 238000010079 rubber tapping Methods 0.000 claims abstract description 12
- 238000007873 sieving Methods 0.000 claims abstract description 7
- 239000002245 particle Substances 0.000 claims description 39
- 238000000034 method Methods 0.000 claims description 36
- 230000008569 process Effects 0.000 claims description 21
- 239000004484 Briquette Substances 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 10
- 229910052717 sulfur Inorganic materials 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 6
- 230000000052 comparative effect Effects 0.000 description 27
- 238000003825 pressing Methods 0.000 description 8
- 239000002994 raw material Substances 0.000 description 7
- 238000001514 detection method Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 229910052595 hematite Inorganic materials 0.000 description 5
- 239000011019 hematite Substances 0.000 description 5
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 5
- 238000000465 moulding Methods 0.000 description 5
- 238000012216 screening Methods 0.000 description 5
- 239000011593 sulfur Substances 0.000 description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 230000009257 reactivity Effects 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000000084 colloidal system Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000009472 formulation Methods 0.000 description 3
- 238000002309 gasification Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 235000013980 iron oxide Nutrition 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/008—Composition or distribution of the charge
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coke Industry (AREA)
Abstract
The application discloses a low ash content and high strength ferrocoke and a preparation method thereof, wherein the ferrocoke comprises the following components according to qualityThe weight percentage comprises: asphalt 5-15%, magnetite powder 5-10%, coking coal 60-70% and lean coal 5-15%, wherein Fe in magnetite powder 3 O 4 The content is more than or equal to 70 percent. The preparation method comprises the following steps: (1) weighing asphalt, and crushing the asphalt in advance; (2) Uniformly mixing pre-crushed asphalt, magnetite powder, coking coal and lean coal according to the mass ratio, and performing secondary crushing; (3) And (3) compacting the formed coal blocks, loading the formed coal blocks into a cold-loading cold-tapping coke oven, carrying out high-temperature carbonization, quenching coke in the oven, cooling to room temperature, discharging coke, and sieving and finishing to obtain the ferrocoke. The application adopts the improved coal blending scheme to match with the preparation process, the ash content of the obtained ferrocoke is lower than 10%, the heat strength is up to 60% and above, the preparation cost is low, and the application has great application advantages.
Description
Technical Field
The application belongs to the field of metallurgy, and particularly relates to low-ash high-strength ferrocoke and a preparation method thereof.
Background
Coke is one type of solid fuel obtained from coal by dry distillation at high temperatures of about 1000 ℃; the main component is fixed carbon, and the ash is the second component, and the volatile and sulfur components are very little. Coke is mainly used for smelting steel or other metals, and can also be used as raw material for making water gas, gasification, chemical industry and the like.
Coke is an essential raw fuel in blast furnace ironmaking and can play the roles of reducing agent, framework and heat source. The steel industry in China has huge yield and needs to consume a large amount of high-quality mineral resources and coking coal resources, but China faces the dilemma that the high-quality mineral resources and the coking coal resources are gradually exhausted, so that the optimization of the coke performance is significant for relieving the contradiction between the huge steel yield, the shortage of the high-quality coking coal resources and the severe environmental problems.
The composite iron coke is one of the core technologies for realizing low-carbon iron making of the blast furnace at present. The composite iron coke is prepared by adding iron-containing resources as a catalyst into coal blending and using a traditional chamber coke oven coking process or a coal briquetting shaft furnace carbonization process. The metal iron generated by reduction of the iron oxide in the carbonization process is dispersed and distributed in the carbon matrix, and has good catalytic effect on the carbon gasification reaction, so that the iron coke has high reactivity, and the gasification reaction can be carried out at a lower temperature. After the blast furnace uses a proper amount of composite iron coke to replace coke, the temperature of a thermal reserve area can be reduced, the difference value between the actual concentration and the equilibrium concentration of CO in coal gas is increased, the driving force of the reduction reaction of iron oxides is increased, the working efficiency of the blast furnace body is further improved, the coke ratio is reduced, and the CO of the blast furnace is reduced 2 And discharging, and realizing low-carbon iron making of the blast furnace.
At present, the preparation process of the ferrocoke mainly comprises a traditional chamber coke oven process and a coal briquetting shaft furnace carbonization process. The traditional chamber coke oven process is divided into a bulk coke oven process, a coal briquetting coke oven process and a tamping coke oven process. The preparation process of the iron coke by carbonizing the coal briquetting shaft furnace comprises two parts of coal briquetting forming and briquetting shaft furnace carbonization. According to different briquette forming processes, the shaft furnace carbonization process of the briquette can be divided into a hot-press type iron coke preparation process and a cold-press type iron coke preparation process. The hot pressed iron coke preparing process is one in which adhesive coal and weak adhesive coal are pressed to form and carbonized in a shaft furnace when the adhesive coal and weak adhesive coal reach the maximum flowability temperature of colloid. The cold-pressing type iron coke preparation process is that mineral coal is pressed, molded and solidified at normal temperature or lower temperature by using an adhesive, and then the mineral coal is carbonized by a shaft furnace.
However, the iron coke products produced by the existing method have the problems of high ash content and low thermal strength, and the ash content of the conventional iron coke is generally higher and is about 12%; the heat intensity is low and is generally lower than 40%; and the cost is high, and a large amount of main coking coal resources are needed to be used. The method has great economic significance if the iron coke with low ash content, high heat strength and low production cost can be provided.
The present application has been made in view of this.
Disclosure of Invention
The application aims to solve the technical problem of overcoming the defects of the prior art and providing low-ash high-strength ferrocoke and a preparation method thereof. The application adopts the improved coal blending scheme to match with the preparation process, the ash content of the obtained ferrocoke is lower than 10%, the heat strength is more than 60%, the preparation cost is low, and the application has great application advantages.
In order to solve the technical problems, the application adopts the basic conception of the technical scheme that:
the first object of the application is to provide a ferrocoke, which comprises the following components in percentage by mass:
asphalt 5-15%, magnetite powder 5-10%, coking coal 60-70% and lean coal 5-15%, wherein the magnetite powderFe of (2) 3 O 4 The content is more than or equal to 70 percent.
In the ferrocoke, asphalt and magnetite powder are fully utilized to regulate the colloid body of coking coal, and meanwhile, cheap lean coal is added to reduce the coal blending cost. The iron coke has less internal cracks, ash content lower than 10% and heat strength higher than 60%, so that the iron coke has obvious advantages in downstream iron making application.
Experiments of the inventor show that when the mass ratio of asphalt, magnetite powder, coking coal and lean coal is in the range, the ash content of iron coke is lower than 10%, and the heat strength is more than 60%; when the mass ratio of the magnetite powder, the coking coal or the lean coal is lower than or exceeds the range, the ash content of the ferrocoke can be increased, and the thermal strength is reduced to some extent.
Further proposal, fe in the magnetite powder 3 O 4 The content is more than or equal to 73 percent.
In the application, the iron source adopts magnetite powder, and Fe of the magnetite powder 3 O 4 The content is more than or equal to 70 percent, and the preferable scheme is more than or equal to 73 percent. Compared with other iron ore sources (such as hematite powder), the magnetite powder can reduce the ash content of the ferrocoke and improve the heat strength.
Further, the composition of the ferrocoke comprises the following components in percentage by mass:
10-15% of asphalt, 5-10% of magnetite powder, 65-70% of coking coal and 10-15% of lean coal.
Further, the composition of the ferrocoke comprises the following components in percentage by mass:
10-15% of asphalt, 10% of magnetite powder, 65-70% of coking coal and 10-15% of lean coal.
When the composition and the proportion of the ferrocoke are as described above, the ferrocoke has lower ash content and higher heat strength.
Further proposal, the caking index of the lean coal is more than or equal to 60 percent, V daf ％≤12％，S t，d ％≤1％。
Further proposal, the caking index of the coking coal is more than or equal to 90 percent, V daf ％≤30％、S t，d ％≤0.8％。
Further, the methodScheme A of the iron coke d ％＜10％，CSR％≥60％。
The second object of the present application is to provide a method for preparing ferrocoke according to any one of the above schemes or combination schemes, comprising:
(1) Weighing asphalt, and crushing the asphalt in advance;
(2) Uniformly mixing pre-crushed asphalt, magnetite powder, coking coal and lean coal according to the mass ratio, and performing secondary crushing;
(3) And (3) compacting the formed coal blocks, loading the formed coal blocks into a cold-loading cold-tapping coke oven, carrying out high-temperature carbonization, quenching coke in the oven, cooling to room temperature, discharging coke, and sieving and finishing to obtain the ferrocoke.
In a further scheme, in the step (1), asphalt is crushed in advance to form particles with the particle size of less than 3mm, wherein the particles account for 95% or more.
In a further scheme, in the step (2), after secondary crushing, the particles with the particle size of less than 3mm of the raw materials account for 98% or more.
In the application, the pre-crushed asphalt is mixed with other raw materials and then subjected to secondary crushing, so that the particles with the particle size smaller than 3mm of the mixed raw materials occupy 98% or more, the raw materials are more uniformly mixed, the ash content of the prepared iron coke is reduced, and the thermal strength of the iron coke is improved.
In a further scheme, in the step (3), the high-temperature carbonization temperature is 1050-1200 ℃ and the time is 350-400h;
preferably, in the step (3), the density of the pressed coal briquette is 1100-1200kg/m 3 。
Further, in the cold charging and tapping coke oven, the coal charging height is controlled to be 2-2.5m.
In a further scheme, the temperature in the iron coke oven rises to reach the high-temperature carbonization temperature at the speed of 1-2 ℃/min.
By adopting the components and the proportion of the application, the mixed raw materials after twice crushing adopt a cold press molding process, and the process of low temperature rising speed and long coking time in a cold charging and cooling tapping coke oven can lead the cracks in the iron coke to be extremely small, the ash content is lower than 10 percent, and the thermal strength is more than 60 percent.
As a specific embodiment, the method for producing ferrocoke of the present application comprises:
(1) Weighing asphalt according to mass percent, and crushing in advance to enable particles with the particle size less than 3mm to occupy 95% or more;
(2) Weighing coking coal, lean coal and magnetite powder, mixing with crushed asphalt, and then performing secondary crushing, wherein the particles with the particle size less than 3mm account for 98% or more after secondary crushing;
(3) Cold pressing the mixed material to form 1100-1200kg/m 3 The molded coal with the specification of 500 multiplied by 450 multiplied by 420cm is piled into a molded coal pile of 2 multiplied by 3 or 2 multiplied by 2, and is put into a cold charging and cooling tapping coke oven, the height of the coal is controlled to be 2 to 2.5m, the temperature is increased to 1050 to 1200 ℃ at the speed of 1 to 2 ℃/min, the molded coal is distilled for 350 to 400 hours at 1050 to 1200 ℃, then is directly quenched in the oven (wet quenching or dry quenching can be carried out), the temperature of the ferrocoke is reduced to the room temperature, and then the ferrocoke is discharged to a screening device for screening and finishing,
after the technical scheme is adopted, compared with the prior art, the application has the following beneficial effects:
1. the application selects Fe 3 O 4 The magnetite powder with the content of more than or equal to 70 percent is taken as an iron source, reasonable components and proportions are adopted, asphalt and magnetite powder are fully utilized to adjust the colloid of coking coal, meanwhile, low-price lean coal is added to reduce the coal blending cost, the ash content of the iron coke is low, the heat strength is high, the preparation cost is low, and the method has great application advantages.
2. The components and the proportion of the application are matched with a secondary crushing process and a cold press molding process, and the process of low temperature rising speed and long coking time in the cold charging and cooling tapping coke oven is adopted, so that the cracks in the ferrocoke are extremely small, the ash content is lower than 10 percent, the heat strength is more than 60 percent, and the advantage of the ferrocoke in downstream ironmaking use is obvious.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions in the following examples will be clearly and completely described, and the following examples are provided for illustrating the present application but are not intended to limit the scope of the present application.
In the application, the quality index of the obtained coke (the test of the moisture, ash and volatile matters index of the coke can be according to GB/T2001-1991 'coke industrial analysis and determination method', the detection of the coke end and granularity index of the coke can be according to GB/T2005-1994 'determination method of coke end content and screening composition of metallurgical coke', the determination of the mechanical strength M40 and M10 of the coke can be according to the annex in GB/T1996-2003 'metallurgical coke', the determination of the sulfur index of the coke can be according to GB/T2286-1991 'determination method of total sulfur content of the coke', and the determination of the thermal property index of the coke can be according to GB/T4000-1996 'determination method of coke reactivity and strength after reaction'.
A d Percent: ash content, determination method: the coke sample was volatilized at 815 ℃, and the percentage of the mass of the residue together with the mass of the coke sample was taken as ash content.
V daf Percent: volatile matter, determination method: the coke sample was placed in a covered dry condition and heated for 7 minutes at 900 c with air isolated to reduce the mass as a percentage of the sample mass, subtracting the moisture content of the sample as the volatile content.
S t，d Percent: sulfur content, coke sample and Ai Shika reagent are mixed fully, and burnt fully in a muffle furnace at 800-850 deg.c for 1-1.5 hr to convert sulfur in the sample into sulfate, and sulfate ion to produce barium sulfate precipitate.
M 40 Percent: crushing strength, determination method: after the coke sample is placed in a rotary drum to rotate for 100 revolutions, the coke sample is discharged out of the rotary drum and passes through a 40mm round hole sieve, and the mass of the coke with the particle size of more than 40mm is weighed and is used as crushing strength.
CRI%: reactivity, determination method: the coke reactivity was expressed as a percentage of the mass loss of coke after the coke sample was placed in the reactor and reacted with carbon dioxide at 1000.+ -. 5 ℃ for 2 hours.
CSR%: post-reaction intensity, determination method: the reacted coke is subjected to a type I drum test, and the mass percent of the coke with the particle size of more than 10mm is used for representing the strength after the reaction.
Example 1
The coal blending scheme (according to mass percent):
asphalt 10%, magnetite powder 10%, coking coal 70%, lean coal 10%,
wherein Fe in the magnetite powder 3 O 4 Content 74.2%;
coking coal A d ％＝11、V daf ％＝27，S t，d The%o=0.5, g value=91.5;
lean coal A d ％＝8.5、V daf ％＝10、S t，d Percent=0.8, G value=68;
the preparation method comprises the following steps:
weighing asphalt according to mass percentage, pre-crushing to make the particle with the particle diameter less than 3mm account for 95% or more, weighing coking coal, lean coal and magnetite powder, mixing with the crushed asphalt, performing secondary crushing to make the particle with the particle diameter less than 3mm account for 98% or more, cold pressing the mixed material to form the compaction density 1150kg/m 3 The briquette with the specification of 500 multiplied by 450 multiplied by 420cm is piled into a briquette pile with the specification of 2 multiplied by 2 and then is put into a cold charge cold tapping coke oven, the coal charge height is controlled at 2m, heating to 1100 ℃ at a speed of 2 ℃/min, carrying out wet quenching in a furnace after high-temperature carbonization for 350h at 1100 ℃, cooling the ferrocoke to room temperature, discharging coke, and sieving and finishing grains.
Through detection, the index parameters of the obtained ferrocoke are as follows:
A d ％＝9.89 V daf ％＝1.21 S t，d ％＝0.59 M 40 ＝93.1 CRI＝44 CSR＝64
example 2
The coal blending scheme (according to mass percent):
15% of asphalt, 10% of magnetite powder, 60% of coking coal and 15% of lean coal,
wherein Fe of magnetite powder 3 O 4 The content is 74.2 percent,
coking coal A d ％＝11、V daf ％＝27，S t，d The%o=0.5, g value=91.5;
lean coal A d ％＝8.5、V daf ％＝10、S t，d Percent=0.8, G value=68;
the preparation method comprises the following steps:
weighing asphalt according to mass percentage, pre-crushing to make the particle with the particle diameter less than 3mm account for 95%, weighing coking coal, lean coal and magnetite powder, mixing with crushed asphalt, performing secondary crushing to make the particle with the particle diameter less than 3mm account for 98% or more, cold-pressing the mixed material to form the compacting density of 1100kg/m 3 The briquette with the specification of 500 multiplied by 450 multiplied by 420cm is piled into a briquette pile with the specification of 2 multiplied by 2 and then is put into a cold charge cold tapping coke oven, the coal charge height is controlled at 2m, heating to 1050 ℃ at a speed of 2 ℃/min, carrying out wet quenching in a furnace after high-temperature carbonization for 400 hours at 1050 ℃, cooling the ferrocoke to room temperature, discharging coke, and sieving and finishing grains.
Through detection, the index parameters of the obtained ferrocoke are as follows:
A d ％＝9.91 V daf ％＝1.15 S t，d ％＝0.56 M 40 ＝92.8 CRI＝48 CSR＝60
example 3
The coal blending scheme (according to mass percent):
asphalt 5%, magnetite powder 10%, coking coal 70%, lean coal 15%,
wherein Fe of magnetite powder 3 O 4 The content is 74.2 percent,
coking coal A d ％＝11、V daf ％＝27，S t，d The%o=0.5, g value=91.5;
lean coal A d ％＝8.5、V daf ％＝10、S t，d Percent=0.8, G value=68;
the preparation method comprises the following steps:
mixing coking coal, lean coal and magnetite powder with crushed asphalt, crushing again to obtain particles with particle size less than 3mm accounting for 95% or more, cold pressing to obtain mixture with pressure density of 1200kg/m 3 The briquette with the specification of 500 multiplied by 450 multiplied by 420cm is piled into a briquette pile with the specification of 2 multiplied by 2, and then is put into a cold charging and tapping coke oven, the coal charging height is controlled to be 2m, the temperature is increased to 1200 ℃ at the speed of 2 ℃/min, and the briquette is subjected to high-temperature carbonization at the temperature of 1200 ℃ for 350 DEG CAfter h, wet quenching is carried out in the furnace, and after the temperature of the iron coke is reduced to room temperature, coke is discharged and sieved for finishing grains.
Through detection, the index parameters of the obtained ferrocoke are as follows:
A d ％＝9.83 V daf ％＝1.24 S t，d ％＝0.60 M 40 ＝92.5 CRI＝47 CSR＝61
example 4
In this example, the proportion and preparation method are the same as those of example 1, fe of magnetite powder 3 O 4 The content is different.
The coal blending scheme (according to mass percent):
asphalt 10%, magnetite powder 10%, coking coal 70%, lean coal 10%,
wherein Fe of magnetite powder 3 O 4 70.5 percent of the total weight of the mixture,
coking coal A d ％＝11、V daf ％＝27，S t，d The%o=0.5, g value=91.5;
lean coal A d ％＝8.5、V daf ％＝10、S t，d Percent=0.8, G value=68;
the preparation method comprises the following steps:
weighing asphalt according to mass percentage, pre-crushing to make the particle with the particle diameter smaller than 3mm account for 95% or more, weighing coking coal, lean coal and magnetite powder, mixing with the crushed asphalt, then carrying out secondary crushing to make the particle with the particle diameter smaller than 3mm account for 98% or more, carrying out cold pressing on the mixed materials to form molded coal with the pressure density of 1200kg/m < 3 >, the specification of 500 x 450 x 420cm, stacking the molded coal into a molded coal pile with the pressure density of 2 x 2, loading the molded coal pile into a cold-charging and cold-discharging coke oven, controlling the coal charging height to be 2m, heating to 1100 ℃ at the speed of 1 ℃/min, carrying out dry distillation at the high temperature of 1200 ℃ for 350h, carrying out wet quenching in the oven, cooling the iron coke to room temperature, discharging coke, and screening and finishing the particles.
Through detection, the index parameters of the obtained ferrocoke are as follows:
A d ％＝9.87 V daf ％＝1.20 S t，d ％＝0.62 M 40 ＝93.5 CRI＝46 CSR＝60.5
example 5
In this example, the ratio and preparation method were the same as in example 1, and the caking indexes of the coking coal and the lean coal were different.
The coal blending scheme (according to mass percent):
asphalt 10%, magnetite powder 10%, coking coal 70%, lean coal 10%,
wherein Fe of magnetite powder 3 O 4 The content is 74.2 percent,
coking coal A d ％＝11、V daf ％＝27，S t，d Percent=0.5, g value=85.6;
lean coal A d ％＝8.5、V daf ％＝10、S t，d Percent=0.8, G value=58;
the preparation method comprises the following steps:
weighing asphalt according to mass percentage, pre-crushing to make the particle with the particle diameter less than 3mm account for 95% or more, weighing coking coal, lean coal and magnetite powder, mixing with the crushed asphalt, performing secondary crushing to make the particle with the particle diameter less than 3mm account for 98% or more, cold pressing the mixed material to form the pressed density of 1200kg/m 3 The briquette with the specification of 500 multiplied by 450 multiplied by 420cm is piled into a briquette pile with the specification of 2 multiplied by 2 and then is put into a cold charge cold tapping coke oven, the coal charge height is controlled at 2m, heating to 1100 ℃ at a speed of 2 ℃/min, carrying out wet quenching in a furnace after high-temperature carbonization for 350h at 1200 ℃, cooling the iron coke to room temperature, discharging coke, and sieving and finishing grains.
Through detection, the index parameters of the obtained ferrocoke are as follows:
A d ％＝9.82 V daf ％＝1.27 S t，d ％＝0.58 M 40 ＝92.1 CRI＝46 CSR＝60.3
comparative example 1
Comparative example 1 the preparation method of example 1 was referred to, except that the proportions of the ingredients in the formulation were different, in particular:
the coal blending scheme of the comparative example is as follows: asphalt 5%, magnetite powder 15%, coking coal 55% and lean coal 25%;
wherein Fe in the magnetite powder 3 O 4 Content 74.2%;
coking coal A d ％＝11、V daf ％＝27，S t，d The%o=0.5, g value=91.5;
lean coal A d ％＝8.5、V daf ％＝10、S t，d The%=0.8, G value=68.
The performance parameters of the iron coke prepared in comparative example 1 were examined as shown in table 1 below.
Comparative example 2
Comparative example 2 the preparation of example 1 was followed, with the difference that the proportions of the ingredients in the formulation were different, in particular:
the coal blending scheme of the comparative example is as follows: 8% of asphalt, 3% of magnetite powder, 80% of coking coal and 10% of lean coal;
wherein Fe in the magnetite powder 3 O 4 Content 74.2%;
coking coal A d ％＝11、V daf ％＝27，S t，d The%o=0.5, g value=91.5;
lean coal A d ％＝8.5、V daf ％＝10、S t，d The%=0.8, G value=68.
The performance parameters of the iron coke prepared in comparative example 2 were examined as shown in table 1 below.
Comparative example 3
Comparative example 3 with reference to the coal blending scheme and preparation method of example 1, the only difference is that magnetite powder in the formulation is replaced with hematite powder, and the specific is:
the coal blending scheme of the comparative example is as follows: 10% of asphalt, 10% of hematite powder, 70% of coking coal and 10% of lean coal,
wherein Fe in hematite powder 2 O 3 The content is 70%;
coking coal A d ％＝11、V daf ％＝27，S t，d The%o=0.5, g value=91.5;
lean coal A d ％＝8.5、V daf ％＝10、S t，d The%=0.8, G value=68.
The performance parameters of the iron coke prepared in comparative example 3 were examined as shown in table 1 below.
Comparative example 4
Comparative example 4 the coal blending scheme of example 1 was referred to, except that in the preparation method, the comparative example adopts a hot press molding iron coke preparation process.
Specifically, the preparation method of this comparative example is as follows:
the asphalt is weighed according to the mass percentage and crushed in advance, so that particles smaller than 3mm account for 95%, the coking coal, the lean coal and the magnetite powder are weighed and mixed with the crushed asphalt, and then secondary crushing is carried out, wherein the particles smaller than 3mm account for 98% after secondary crushing. Then the mixed coal powder is heated to 300 ℃, and then is pressurized to form the coal powder with the pressure density of 1000kg/m 3 The method comprises the steps of stacking 500X 450X 420cm molded coal into 2X 2 molded coal stacks, loading the molded coal stacks into a cold-loading cold-tapping coke oven, controlling the coal loading height to be 2m, heating to 1100 ℃ at the speed of 2 ℃/min, carrying out high-temperature carbonization for 350h at the temperature of 1100 ℃, carrying out wet quenching in the oven, cooling the iron coke to the room temperature, discharging coke, and screening and finishing grains.
The performance parameters of the iron coke prepared in comparative example 4 were examined and are shown in table 1 below.
Comparative example 5
Comparative example 5 the coal blending scheme of example 1 was referred to, except that no secondary crushing was performed in the preparation method of this comparative example.
Specifically, the preparation method of this comparative example is as follows:
pre-crushing asphalt according to the mass percentage, so that particles smaller than 3mm account for 95%, weighing coking coal, lean coal and magnetite powder, mixing with the crushed asphalt, and cold pressing the mixed materials to form the compaction density of 1150kg/m 3 And stacking the briquette with the specification of 500 multiplied by 450 multiplied by 420cm into a briquette pile with the specification of 2 multiplied by 2, loading the briquette pile into a cold-loading and cold-discharging coke oven, controlling the coal loading height to 2m and 1100 ℃, carrying out high-temperature carbonization for 350h at the temperature of 1100 ℃, carrying out wet quenching in the oven, cooling the iron coke to room temperature, discharging coke, and sieving and finishing granules.
The performance parameters of the iron coke prepared in comparative example 5 were examined and are shown in table 1 below.
TABLE 1
Analysis:
in the examples 1-5 of the application, the ash content of the prepared ferrocoke is less than 10%, and the heat strength is more than or equal to 60%. Among them, the hot strength of the iron coke prepared in example 1 was highest, and the ash content was also lower than 10%.
Referring to the results in examples 1 to 5 and Table 1, in the coal blending schemes of comparative examples 1 and comparative example 2, the magnetite powder content was 3% and 15%, the coking coal content was 55% and 80%, respectively, and the ash content (A) d % of the iron coke is higher than 10% and the thermal strength (CSR) is lower than 55%, that is to say the obtained iron coke has a high ash content and a low thermal strength.
By adopting the scheme of the application, when the proportion of asphalt 5-15%, magnetite powder 5-10%, coking coal 60-70% and lean coal 5-15% is in the above range, the ash content of the prepared ferrocoke is below 10%, the heat strength is above 60%, and the performance is greatly improved.
Compared with comparative example 3 using hematite powder, examples 1 to 5 of the present application use magnetite powder, which can reduce the ash content of iron coke and improve the heat strength.
Compared with comparative example 4 adopting the hot press molding preparation process, the coal blending schemes of examples 1 to 5 of the present application can further improve the thermal strength of the iron coke by matching with the cold press molding process.
Comparing comparative example 5 with example 1 shows that the raw materials are more uniformly mixed after the secondary crushing step, which is beneficial to reducing ash content of the prepared ferrocoke and improving heat strength.
The foregoing description is only illustrative of the preferred embodiment of the present application, and is not to be construed as limiting the application, but is to be construed as limiting the application to any and all simple modifications, equivalent variations and adaptations of the embodiments described above, which are within the scope of the application, may be made by those skilled in the art without departing from the scope of the application.
Claims (9)
1. The iron coke is characterized by comprising the following components in percentage by mass:
asphalt 5-15%, magnetite powder 5-10%, coking coal 60-70% and lean coal 5-15%, wherein Fe in magnetite powder 3 O 4 The content is more than or equal to 70 percent;
the caking index of the lean coal is more than or equal to 60 percent, V daf ％≤12％，S t，d ％≤1％；
The caking index of the coking coal is more than or equal to 90 percent, V daf ％≤30％、S t，d ％≤0.8％。
2. The iron coke according to claim 1, wherein the magnetite powder contains Fe 3 O 4 The content is more than or equal to 73 percent.
3. The iron coke according to claim 1, wherein the composition of the iron coke comprises, in mass percent:
10-15% of asphalt, 5-10% of magnetite powder, 65-70% of coking coal and 10-15% of lean coal.
4. A ferro coke according to any one of claims 1-3, wherein a of the ferro coke d ％＜10％，CSR％≥60％。
5. A method for producing the ferrocoke according to any one of claims 1 to 4, comprising:
(1) Weighing asphalt, and crushing the asphalt in advance;
(2) Uniformly mixing pre-crushed asphalt, magnetite powder, coking coal and lean coal according to the mass ratio, and performing secondary crushing;
(3) And (3) compacting the formed coal blocks, loading the formed coal blocks into a cold-loading cold-tapping coke oven, carrying out high-temperature carbonization, quenching coke in the oven, cooling to room temperature, discharging coke, and sieving and finishing to obtain the ferrocoke.
6. The process according to claim 5, wherein in the step (1), the pitch is previously crushed so that 95% or more of particles having a particle diameter of < 3mm are contained.
7. The process according to claim 5, wherein in the step (2), after the secondary crushing, the particles having a particle diameter of less than 3mm are 98% or more.
8. The process according to claim 5, wherein in the step (3), the high-temperature carbonization is performed at 1050 to 1200 ℃ for 350 to 400 hours.
9. The method according to claim 8, wherein in the step (3), the density of the briquette is 1100 to 1200kg/m 3 。
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011108466A1 (en) * | 2010-03-03 | 2011-09-09 | Ｊｆｅスチール株式会社 | Process for producing ferro coke for metallurgy |
| CN103468289A (en) * | 2013-09-27 | 2013-12-25 | 武汉科技大学 | Iron coke for blast furnace and preparing method thereof |
| CN109957431A (en) * | 2017-12-14 | 2019-07-02 | 宝山钢铁股份有限公司 | A method of iron coke Composite burden is produced using steel rolling sludge |
| CN110241273A (en) * | 2019-04-30 | 2019-09-17 | 武汉科技大学 | A kind of iron coke and preparation method thereof using west place in Hubei iron ore and bottle coal preparation |
| CN110746997A (en) * | 2019-10-29 | 2020-02-04 | 武汉钢铁有限公司 | Method for refining metallurgical coke |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011108466A1 (en) * | 2010-03-03 | 2011-09-09 | Ｊｆｅスチール株式会社 | Process for producing ferro coke for metallurgy |
| CN103468289A (en) * | 2013-09-27 | 2013-12-25 | 武汉科技大学 | Iron coke for blast furnace and preparing method thereof |
| CN109957431A (en) * | 2017-12-14 | 2019-07-02 | 宝山钢铁股份有限公司 | A method of iron coke Composite burden is produced using steel rolling sludge |
| CN110241273A (en) * | 2019-04-30 | 2019-09-17 | 武汉科技大学 | A kind of iron coke and preparation method thereof using west place in Hubei iron ore and bottle coal preparation |
| CN110746997A (en) * | 2019-10-29 | 2020-02-04 | 武汉钢铁有限公司 | Method for refining metallurgical coke |
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