CN115612762B - Iron coke with high cold and hot strength and preparation method thereof - Google Patents
Iron coke with high cold and hot strength and preparation method thereof Download PDFInfo
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- CN115612762B CN115612762B CN202110787712.2A CN202110787712A CN115612762B CN 115612762 B CN115612762 B CN 115612762B CN 202110787712 A CN202110787712 A CN 202110787712A CN 115612762 B CN115612762 B CN 115612762B
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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 108
- 229910052742 iron Inorganic materials 0.000 title claims description 47
- 238000002360 preparation method Methods 0.000 title abstract description 27
- 239000003245 coal Substances 0.000 claims abstract description 92
- 239000000843 powder Substances 0.000 claims abstract description 56
- 239000010426 asphalt Substances 0.000 claims abstract description 53
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims abstract description 51
- 238000004939 coking Methods 0.000 claims abstract description 49
- 239000011273 tar residue Substances 0.000 claims abstract description 39
- 238000002156 mixing Methods 0.000 claims abstract description 26
- 239000002893 slag Substances 0.000 claims abstract description 25
- 239000011269 tar Substances 0.000 claims abstract description 25
- 238000005303 weighing Methods 0.000 claims abstract description 20
- 238000003763 carbonization Methods 0.000 claims abstract description 17
- 238000010791 quenching Methods 0.000 claims abstract description 14
- 230000000171 quenching effect Effects 0.000 claims abstract description 14
- 238000007599 discharging Methods 0.000 claims abstract description 11
- 238000011068 loading method Methods 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 238000007873 sieving Methods 0.000 claims abstract description 9
- 239000002245 particle Substances 0.000 claims description 43
- 238000000034 method Methods 0.000 claims description 28
- 230000008569 process Effects 0.000 claims description 16
- 229910052717 sulfur Inorganic materials 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 abstract description 9
- 230000008901 benefit Effects 0.000 abstract description 7
- 230000000052 comparative effect Effects 0.000 description 25
- 239000002994 raw material Substances 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 238000001514 detection method Methods 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
- 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
- 239000011593 sulfur Substances 0.000 description 5
- 238000009472 formulation Methods 0.000 description 4
- 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
- 238000002309 gasification Methods 0.000 description 3
- 239000004615 ingredient Substances 0.000 description 3
- 238000012216 screening Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000004484 Briquette Substances 0.000 description 2
- 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
- -1 and meanwhile Substances 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
- 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
- 238000012360 testing method Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000009471 action Effects 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
- 235000013339 cereals Nutrition 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
- 238000007796 conventional method Methods 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
- 239000000446 fuel 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
- 238000003825 pressing Methods 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
- 235000020985 whole grains Nutrition 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 high-cold-hot-strength ferrocoke and a preparation method thereof, wherein the ferrocoke comprises the following components in percentage by massComprising the following steps: the composition of the ferrocoke comprises asphalt, tar slag, magnetite powder and coking coal, wherein Fe in the magnetite powder 3 O 4 The content is more than or equal to 60 percent, and the mass ratio of the asphalt to the tar slag is 1:1-2. The preparation method comprises the following steps: (1) Weighing asphalt and tar residues, and crushing the asphalt and the tar residues in advance; (2) Weighing magnetite powder and coking coal according to the mass ratio, mixing with pre-crushed asphalt and tar residues, and performing secondary crushing; (3) Tamping into coal cakes, loading into a coke oven, carrying out high-temperature carbonization, quenching coke in the oven, cooling to room temperature, discharging coke, and sieving and finishing to obtain ferrocoke. The application adopts an improved coal blending scheme, the obtained ferrocoke with high cold strength and hot strength has the cold strength reaching more than 90 percent and the hot strength reaching more than 65 percent, and the preparation cost is low, thereby having great application advantages.
Description
Technical Field
The application belongs to the field of metallurgy, and particularly relates to iron coke with high cold and hot strength 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 hot and cold strength of the ferrocoke produced by the conventional method is lower, the cold strength M40 is generally lower than 80%, and the hot strength CSR 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 higher cold and hot 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 iron coke with high cold and hot strength and a preparation method thereof. The application adopts the improved coal blending scheme to match with the preparation process, improves the cold and hot strength of the coke, and has the advantages of higher cold strength of the obtained iron coke, low preparation cost and larger application advantage.
In order to solve the technical problems, the application adopts the basic conception of the technical scheme that:
a first object of the present application is to provide a ferrocoke comprising asphalt, tar slag, magnetite powder and coking coal, wherein Fe in the magnetite powder 3 O 4 The content is more than or equal to 60 percent, the mass ratio of the asphalt to the tar slag is 1:1-2, and the best isSelecting 1:1-1.5.
In the iron coke, asphalt and magnetite powder are fully utilized to adjust the colloid body of coking coal, and meanwhile, tar slag is added, so that the cold and hot strength of the coke can be improved. The iron coke has less internal cracks and higher cold and hot strength, so that the iron coke has obvious advantages in downstream iron making application.
The inventor finds that when the mass ratio of asphalt to tar slag is 1:1-2, preferably 1:1-1.5, high-quality ferrocoke with higher cold and hot strength and M of ferrocoke are obtained 40 More than 90 percent and the heat strength CSR percent is more than or equal to 65 percent. When the mass ratio of asphalt to tar slag is lower than or exceeds the above range, the cold and hot strength of the iron coke is reduced.
Further proposal, fe in the magnetite powder 3 O 4 The content is more than or equal to 65 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 60 percent, and the preferable scheme is more than or equal to 65 percent. Compared with other iron ore sources (such as hematite powder), the adoption of the magnetite powder can further improve the cold strength and the hot strength of the ferrocoke.
Further, the composition of the ferrocoke comprises the following components in percentage by mass:
asphalt 5-15%, tar slag 10-20%, magnetite powder 5-10% and coking coal 60-70%.
As a preferable scheme, the composition of the ferrocoke comprises the following components in percentage by mass:
7.5-15% of asphalt, 10-15% of tar residue, 5-10% of magnetite powder and 60-70% of coking coal.
When the composition and the proportion of the iron coke are as described above, the cold and hot strength of the iron coke is higher.
Further proposal, V of the tar residue daf ％≤30％，S t，d ％≤1％，A d ％≤4％。
Further proposal, the caking index of the coking coal is more than or equal to 80 percent, V daf ％≤30％、S t，d ％≤0.8％。
Further, the M of the ferrocoke 40 More than 90 percent and the heat strength CSR percent is more than or equal to 65 percent. 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 tar residues, and crushing the asphalt and the tar residues in advance;
(2) Weighing magnetite powder and coking coal according to the mass ratio, mixing with pre-crushed asphalt and tar residues, and performing secondary crushing;
(3) Tamping into coal cakes, loading into a coke oven, carrying out high-temperature carbonization, quenching coke in the oven, cooling to room temperature, discharging coke, and sieving and finishing to obtain ferrocoke.
In a further scheme, in the step (1), asphalt and tar residues are crushed in advance so that particles with the particle size smaller than 3mm 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 and tar residues are 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 mixed more uniformly, and the different raw materials are fully matched for action, thereby being beneficial to improving the cold strength and the hot strength of the prepared ferrocoke.
In a further scheme, in the step (3), the high-temperature carbonization temperature is 1050-1200 ℃ and the time is 350-400h.
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 two times of crushing are mixed more uniformly, the prepared ferrocoke has few cracks inside, and the cold and hot strength of the coke is greatly improved.
According to the preparation method, a coke quenching mode in the furnace is adopted, so that the temperature difference between cold and hot in the coke quenching process can be reduced, the generation of iron coke cracks can be reduced, and the cold and hot strength of the iron coke can be improved.
As a specific embodiment, the method for producing ferrocoke of the present application comprises:
(1) Weighing asphalt and tar residues 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 and magnetite powder, mixing with crushed asphalt and tar residues, and performing secondary crushing, wherein the particles with the particle size less than 3mm account for 98% or more after secondary crushing;
(3) Tamping the mixed materials into coal cakes, loading the coal cakes into a coke oven, heating to 1050-1200 ℃ at a speed of 1-2 ℃/min, performing dry distillation at 1050-1200 ℃ for 350-400h, directly quenching the coke in the oven (wet quenching or dry quenching), cooling the iron coke to room temperature, discharging the coke to a screening device for screening and finishing grains,
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 60 percent is taken as an iron source, reasonable components and proportions are adopted, asphalt and magnetite powder are fully utilized to adjust the colloid body of coking coal, and meanwhile, tar slag is matched, so that the cold and hot strength of coke can be improved, the prepared iron coke has high cold and hot strength, low ash content and low preparation cost, and has great application advantages.
2. The application controls the mass ratio of asphalt to tar residues to be 1:1-2, preferably 1:1-1.5, has reasonable proportion, can improve the cold and hot strength of coke, can lead the cracks in the ferrocoke to be extremely small by matching with a secondary crushing process, and leads the cold strength of the ferrocoke to reach more than 90 percent and the hot strength to reach 65 percent and more, thus leading the advantage of the ferrocoke in downstream ironmaking use to be 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%, tar residue 15%, magnetite powder 5%, coking coal 70%,
wherein Fe in the magnetite powder 3 O 4 The content is 68%;
coking coal A d ％＝11、V daf ％＝27，S t，d Percent=0.5, g value=81.5;
tar residue A d ％＝0.33、V daf ％＝30、S t，d ％＝0.41。
The preparation method comprises the following steps:
weighing asphalt and tar slag according to a formula, respectively crushing in advance to enable particles with the particle size less than 3mm to account for 95% or more, weighing coking coal and magnetite powder according to the mass ratio, mixing the coking coal and the magnetite powder with crushed asphalt and tar slag, crushing for the second time to enable particles with the particle size less than 3mm to account for 98% or more, tamping the mixed materials into coal cakes, loading the coal cakes into a coke oven, heating to 1150 ℃ at the speed of 2 ℃/min, maintaining the high-temperature carbonization at 1150 ℃ for 400 hours, performing wet quenching in the oven, cooling the ferrocoke to room temperature, discharging coke, and sieving and finishing the particles.
Through detection, the index parameters of the obtained ferrocoke are as follows:
A d ％＝9.88 V daf ％＝1.20 S t，d ％＝0.56 M 40 ％＝96.8 CRI％＝42 CSR％＝69
example 2
The coal blending scheme (according to mass percent):
15% of asphalt, 15% of tar residue, 10% of magnetite powder and 60% of coking coal;
wherein Fe of magnetite powder 3 O 4 68% of the total content,
coking coal A d ％＝11、V daf ％＝27，S t，d The%o=0.5, g value=91.5;
tar residue A d ％＝2.8、V daf ％＝10.5、S t，d ％＝0.41；
The preparation method comprises the following steps:
weighing asphalt and tar slag according to a formula, respectively crushing in advance to enable particles with the particle size less than 3mm to account for 95% or more, weighing coking coal and magnetite powder according to the mass ratio, mixing the coking coal and the magnetite powder with crushed asphalt and tar slag, crushing again to enable particles with the particle size less than 3mm to account for 98% or more after secondary crushing, tamping the mixed materials into coal cakes, loading the coal cakes into a coke oven, heating to 1050 ℃ at the speed of 2 ℃/min, maintaining the high-temperature carbonization at 1050 ℃ for 400 hours, performing wet quenching in the oven, cooling the iron coke to room temperature, discharging coke, and sieving and finishing the particles.
Through detection, the index parameters of the obtained ferrocoke are as follows:
A d ％＝8.97 V daf ％＝1.09 S t，d ％＝0.51 M 40 ％＝96.1 CRI％＝45 CSR％＝67
example 3
The coal blending scheme (according to mass percent):
7.5% of asphalt, 15% of tar residue, 7.5% of magnetite powder and 70% of coking coal,
wherein Fe of magnetite powder 3 O 4 The content is 61 percent,
coking coal A d ％＝11、V daf ％＝27，S t，d The%o=0.5, g value=91.5;
tar residue A d ％＝0.33、V daf ％＝30、S t，d ％＝0.41；
The preparation method comprises the following steps:
weighing asphalt and tar slag according to a formula, respectively crushing in advance to enable particles with the particle size less than 3mm to account for 95% or more, weighing coking coal and magnetite powder according to the mass ratio, mixing the coking coal and the magnetite powder with crushed asphalt and tar slag, crushing again to enable particles with the particle size less than 3mm to account for 98% or more after secondary crushing, tamping the mixed materials into coal cakes, loading the coal cakes into a coke oven, heating to 1200 ℃ at the speed of 1 ℃/min, carrying out wet quenching in the oven after maintaining the high-temperature carbonization at 1200 ℃ for 350h, discharging coke and sieving the whole grains after the temperature of the ferrocoke is reduced to the room temperature.
Through detection, the index parameters of the obtained ferrocoke are as follows:
A d ％＝9.67 V daf ％＝1.12 S t，d ％＝0.58 M 40 ％＝92.1 CRI％＝46 CSR％＝65
example 4
The coal blending scheme (according to mass percent):
10% of asphalt, 10% of tar residue, 10% of magnetite powder and 70% of coking coal;
wherein Fe of magnetite powder 3 O 4 The content is 61 percent,
coking coal A d ％＝11、V daf ％＝27，S t，d Percent=0.5, g value=75;
tar residue A d ％＝0.33、V daf ％＝30、S t，d ％＝0.41；
The preparation method comprises the following steps:
weighing asphalt and tar slag according to a formula, respectively crushing in advance to enable particles with the particle size less than 3mm to account for 95% or more, weighing coking coal and magnetite powder according to the mass ratio, mixing the coking coal and the magnetite powder with crushed asphalt and tar slag, crushing for the second time to enable particles with the particle size less than 3mm to account for 98% or more, tamping the mixed materials into coal cakes, loading the coal cakes into a coke oven, heating to 1100 ℃ at the speed of 2 ℃/min, maintaining the high-temperature carbonization at 1100 ℃ for 400 hours, performing wet quenching in the oven, cooling the iron coke to the room temperature, discharging coke, and sieving and finishing the particles.
Through detection, the index parameters of the obtained ferrocoke are as follows:
A d ％＝9.74 V daf ％＝1.3 S t，d ％＝0.57 M 40 ％＝90.4 CRI％＝41.5 CSR％＝65.2
example 5
The coal blending scheme (according to mass percent):
asphalt 10%, tar residue 15%, magnetite powder 5%, coking coal 70%,
wherein Fe of magnetite powder 3 O 4 68% of the total content,
coking coal A d ％＝11、V daf ％＝27，S t，d The%o=0.5, g value=91.5;
tar residue A d ％＝0.33、V daf ％＝30、S t，d ％＝0.41；
The preparation method comprises the following steps:
weighing asphalt and tar slag according to a formula, respectively crushing in advance to enable particles with the particle size less than 3mm to account for 95% or more, weighing coking coal and magnetite powder according to the mass ratio, mixing the coking coal and the magnetite powder with crushed asphalt and tar slag, crushing again to enable particles with the particle size less than 3mm to account for 98% or more after secondary crushing, tamping the mixed materials into coal cakes, loading the coal cakes into a coke oven, heating to 1050 ℃ at the speed of 2 ℃/min, maintaining the high-temperature carbonization at 1050 ℃ for 400 hours, performing wet quenching in the oven, cooling the iron coke to room temperature, discharging coke, and sieving and finishing the particles.
Through detection, the index parameters of the obtained ferrocoke are as follows:
A d ％＝9.77 V daf ％＝1.02 S t，d ％＝0.59 M 40 ％＝93.1 CRI％＝40 CSR％＝65.6
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%, tar residue 15%, magnetite powder 10% and coking coal 70%;
wherein Fe in the magnetite powder 3 O 4 The content is 68%;
coking coal A d ％＝11、V daf ％＝27，S t，d Percent=0.5, g value=81.5;
tar residue A d ％＝0.33、V daf ％＝30、S t，d ％＝0.41。
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: asphalt 5%, tar residue 25%, magnetite powder 15% and coking coal 55%;
wherein Fe in the magnetite powder 3 O 4 The content is 68%;
coking coal A d ％＝11、V daf ％＝27，S t，d Percent=0.5, g value=81.5;
tar residue A d ％＝0.33、V daf ％＝30、S t，d ％＝0.41。
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 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: 12% of asphalt, 5% of tar residue, 3% of magnetite powder and 80% of coking coal;
wherein Fe in the magnetite powder 3 O 4 The content is 68%;
coking coal A d ％＝11、V daf ％＝27，S t，d Percent=0.5, g value=81.5;
tar residue A d ％＝0.33、V daf ％＝30、S t，d ％＝0.41。
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 and the preparation method of example 1 are referred to, except that magnetite powder is replaced with hematite powder in the formulation, and the following is specific:
the coal blending scheme of the comparative example is as follows: asphalt 10%, tar residue 15%, hematite powder 5%, coking coal 70%,
wherein Fe in hematite powder 2 O 3 The content is 65%;
coking coal A d ％＝11、V daf ％＝27，S t，d Percent=0.5, g value=81.5;
tar residue A d ％＝0.33、V daf ％＝30、S t，d ％＝0.41。
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:
weighing asphalt and tar residues according to a formula, respectively crushing in advance to enable particles with the particle size less than 3mm to account for 95% or more, weighing coking coal and magnetite powder according to the mass ratio, mixing with crushed asphalt and tar residues, tamping the mixed materials into coal cakes, loading into a coke oven, heating to 1150 ℃ at the speed of 2 ℃/min, maintaining the temperature of 1150 ℃ for high-temperature carbonization for 400 hours, performing wet quenching in the oven, cooling the temperature of the ferrocoke to the room temperature, discharging coke, and sieving to obtain the finished particles.
The performance parameters of the iron coke prepared in comparative example 5 were examined and are shown in table 1 below.
TABLE 1
According to the results of comparative examples 1 to 5 and examples 1 to 5, the analysis was as follows:
in the examples 1-5 of the application, the cold strength of the prepared ferrocoke is more than 90%, and the hot strength is more than or equal to 65%. Wherein, under the scheme of blending coal in example 1, the cold strength and the hot strength of the prepared ferrocoke are highest.
In the scheme of the coal blending of comparative examples 1-3, the mass ratio of asphalt to tar slag is not in the range of 1:1-2, and the cold strength and the hot strength of the prepared iron coke are not high.
By adopting the scheme of the application, the mass ratio of asphalt to tar slag is 1:1-2, and the proportions of the components are within the following range according to the mass percentage, namely, 5-15% of asphalt, 10-20% of tar slag, 5-10% of magnetite powder and 60-70% of coking coal, the cold strength of the prepared ferrocoke is more than 90%, the hot strength is more than or equal to 65%, and the cold and hot strength performance is greatly improved.
In examples 1 to 5 of the present application, the cold strength and the hot strength of the iron coke can be improved at the same time by using magnetite powder, compared with comparative example 4 using hematite powder.
As can be seen from comparing comparative example 5 with example 1, after the secondary crushing step, the raw materials are more uniformly and fully mixed, and the different raw materials are fully matched, so that the cold strength and the hot strength of the ferrocoke are improved.
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 (8)
1. A ferrocoke is characterized by comprising asphalt, tar slag, magnetite powder and coking coal, wherein Fe in the magnetite powder 3 O 4 The content is more than or equal to 60 percent, and the mass ratio of the asphalt to the tar slag is 1:1-2;
the iron coke comprises the following components in percentage by mass: 5-15% of asphalt, 10-20% of tar residue, 5-10% of magnetite powder and 60-70% of coking coal;
v of said tar residue daf ％≤30％，S t，d ％≤1％，A d ％≤4％；
The caking index of the coking coal is more than or equal to 80 percent, V daf ％≤30％、S t，d ％≤0.8％。
2. The iron coke according to claim 1, wherein the mass ratio of asphalt to tar slag is 1:1-1.5.
3. The iron coke according to claim 1, wherein the magnetite powder contains Fe 3 O 4 The content is more than or equal to 65 percent.
4. A ferro coke according to any one of claims 1-3, wherein M of the ferro coke 40 More than 90 percent and the heat strength CSR percent is more than or equal to 65 percent.
5. A method for producing the ferrocoke according to any one of claims 1 to 4, comprising:
(1) Weighing asphalt and tar residues, and crushing the asphalt and the tar residues in advance;
(2) Weighing magnetite powder and coking coal according to the mass ratio, mixing with pre-crushed asphalt and tar residues, and performing secondary crushing;
(3) Tamping into coal cakes, loading into a coke oven, carrying out high-temperature carbonization, quenching coke in the oven, cooling to room temperature, discharging coke, and sieving and finishing to obtain ferrocoke.
6. The method according to claim 5, wherein in the step (1), the asphalt and the tar residue are crushed in advance so that particles having a particle diameter of < 3mm account for 95% or more.
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.
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| 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 |
| CN104419825A (en) * | 2013-09-05 | 2015-03-18 | 鞍钢股份有限公司 | Ferrous coke composite pellet containing tar residues and production method thereof |
| CN110093467A (en) * | 2019-06-05 | 2019-08-06 | 东北大学 | A kind of preparation method of iron coke |
| 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 |
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| 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 |
| CN104419825A (en) * | 2013-09-05 | 2015-03-18 | 鞍钢股份有限公司 | Ferrous coke composite pellet containing tar residues and production method thereof |
| CN103468289A (en) * | 2013-09-27 | 2013-12-25 | 武汉科技大学 | Iron coke for blast furnace and preparing method thereof |
| 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 |
| CN110093467A (en) * | 2019-06-05 | 2019-08-06 | 东北大学 | A kind of preparation method of iron coke |
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