CN116377149A - Preparation method of iron-carbon composite furnace burden and iron-carbon composite furnace burden - Google Patents
Preparation method of iron-carbon composite furnace burden and iron-carbon composite furnace burden Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 55
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000003245 coal Substances 0.000 claims abstract description 85
- 239000000843 powder Substances 0.000 claims abstract description 50
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000000463 material Substances 0.000 claims abstract description 45
- 238000004939 coking Methods 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 25
- 238000003763 carbonization Methods 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000002245 particle Substances 0.000 claims abstract description 16
- 238000005453 pelletization Methods 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 239000008188 pellet Substances 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 238000005507 spraying Methods 0.000 claims abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 69
- 229910052742 iron Inorganic materials 0.000 claims description 30
- 239000002184 metal Substances 0.000 claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 238000010000 carbonizing Methods 0.000 claims description 5
- 238000007885 magnetic separation Methods 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 239000012141 concentrate Substances 0.000 claims description 3
- 239000011280 coal tar Substances 0.000 claims description 2
- 229910052595 hematite Inorganic materials 0.000 claims description 2
- 239000011019 hematite Substances 0.000 claims description 2
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 claims description 2
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 abstract description 17
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 11
- 238000005516 engineering process Methods 0.000 abstract description 2
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- 206010013883 Dwarfism Diseases 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
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- 238000006555 catalytic reaction Methods 0.000 description 3
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- 238000001035 drying Methods 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 3
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- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 230000001737 promoting effect Effects 0.000 description 3
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- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 description 1
- 229910015189 FeOx Inorganic materials 0.000 description 1
- 240000007817 Olea europaea Species 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
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- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
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- 238000002485 combustion reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- XLZOVRYBVCMCGL-UHFFFAOYSA-L disodium;4-[[tert-butyl(oxido)azaniumylidene]methyl]benzene-1,3-disulfonate Chemical compound [Na+].[Na+].CC(C)(C)[N+]([O-])=CC1=CC=C(S([O-])(=O)=O)C=C1S([O-])(=O)=O XLZOVRYBVCMCGL-UHFFFAOYSA-L 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
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- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
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Images
Classifications
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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
- C21B5/008—Composition or distribution of the charge
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2413—Binding; Briquetting ; Granulating enduration of pellets
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/244—Binding; Briquetting ; Granulating with binders organic
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention provides a preparation method of an iron-carbon composite furnace burden and the iron-carbon composite furnace burden, and belongs to the technical field of metallurgical technology. The iron-carbon composite furnace burden provided by the invention comprises the following raw materials in parts by weight: 61-84 parts of non-coking coal powder; 10-30 parts of iron oxide; 6-9 parts of high-temperature accelerator; 8-12 parts of hot water; the preparation method comprises the following steps: after the raw materials are uniformly mixed, pelletizing the mixed materials to obtain a pellet; carrying out sectional carbonization on the ball material at 650-1050 ℃; and directly spraying and cooling the carbonized ball material to obtain the iron-carbon composite furnace burden. Unlike coking coal, the non-coking coal has good cohesiveness and low high-temperature strength, and is difficult to apply in a blast furnace, the method adds iron oxide into the non-coking coal, changes the particle size of the furnace charge, and carries out carbonization treatment in a kiln which is not directly roasted for one-step forming to obtain the iron-carbon composite furnace charge capable of replacing the coking coal, thereby conforming to the national conditions of rich storage of the non-coking coal in China, solving the technical problem of insufficient energy storage of the coking coal, and reducing the cost and the carbon emission by more than 10 percent.
Description
Technical Field
The invention belongs to the technical field of metallurgical technology, and particularly relates to a preparation method of an iron-carbon composite furnace burden and the iron-carbon composite furnace burden.
Background
The blast furnace is used as a main process facility of metallurgy for over 200 years, the energy exchange is high-efficiency, the popularization of the blast furnace is promoted, the social progress and development are promoted, the blast furnace plays a great role in national economy, and a reducing agent-coke used by the blast furnace becomes an indispensable furnace burden in an iron-making process. The strength of the coke plays a role of supporting furnace burden by a framework in the blast furnace, and the high-strength coke at the belly of the blast furnace is used for filtering the molten iron; the high fixed carbon content is the main reducing agent of the iron oxide, and the carbon in the coke can not be separated no matter the indirect reduction reaction at the upper part or the direct reduction reaction at the furnace belly; the coke has higher heat value, and the reduction reaction releases a large amount of heat to become heat which is indistinct from pyrometallurgy.
With the rapid development of economy, the method is used as a main smelting means of metallurgy, a large amount of carbon emission brings environmental influence while contributing to a base material, the iron and steel industry takes up 16% of industrial carbon emission, and 70% of carbon emission of iron and steel is in an iron-making process, so that the adjustment of the furnace burden structure of a blast furnace process is a key link of energy conservation and emission reduction. In addition, the roasting of the coke depends on high-quality cohesive coking coal, and the coking coal accounts for about 5.9 percent of the coal, which is insufficient to support the requirement of blast furnace ironmaking, the large-sized blast furnace needs higher-quality coke, the production of the coke also has great influence on the environment, the global warming and the shortage of high-quality resources are caused, and the limitation of the yield of the coke is also common knowledge of multiple countries.
The China is mainly coal, lacks oil and gas, and the dwarf period coal field coal which is ascertained belongs to long flame coal and non-caking coal with extremely low ash, extremely low sulfur, extremely low phosphorus, high volatile and medium and high calorific value, the reserve accounts for 39.6 percent of the ascertained coal amount, and the dwarf period coal field coal is an ideal raw material for coal carbonization and is also a high-quality raw material for coal chemical industry, and has been developed for a long time in recent years. The Jurassic coal fields are most abundant in reserves, mainly concentrated in North China and northwest China, and the famous coal fields mainly include Shenfu coal fields, dongsheng coal fields, datong coal fields and coal fields which are not yet developed. The reserve of l349.4 hundred million tons is ascertained, and the coals are mainly long flame coal, non-caking coal and weak caking coal, commonly known as Shenfu coalThe field refers to the dwarfism coal field. Because Jurassic coal does not have good cohesiveness like coking coal, coke cannot be prepared by high-temperature calcination like coke, semicoke (commonly called semi-coke) can be prepared even if part of the coke is weakly cohesiveness, and the coke is fragile due to poor strength, and 1000m of the coke is used except for small part of a small blast furnace 3 The above blast furnace cannot be used at all.
Therefore, how to realize extremely energy efficiency in a short period, how to relieve the pressure of coke used by a blast furnace, and how to seek a coke substitute material of a low-carbon path are objects of pursuing.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
In order to solve the technical problems of large coke demand but insufficient supply of the traditional blast furnace reducer in the prior art, the preparation method of the iron-carbon composite furnace burden and the iron-carbon composite furnace burden are provided.
The invention provides a preparation method of an iron-carbon composite furnace charge, which comprises the following raw materials in parts by weight:
61-84 parts of non-coking coal powder;
10-30 parts of iron oxide;
6-9 parts of high-temperature accelerator;
8-12 parts of hot water.
In some embodiments, the high temperature promoter is high temperature pitch powder and/or high temperature coal tar.
Unlike conventional cold binders, the high temperature promoters employed in the present invention are themselves binders, reducing agents, and high Wen Zengjiang agents. The high temperature promotes the bonding effect in the cold state, and the C, H compound which is extremely volatile is released at the high temperature to form CO or H 2 The reducing atmosphere is convenient for the peripheral fine iron oxide particles to react, the iron oxide is reduced into Fe, excessive C is distilled, and the hard and high-temperature resistant fixed carbon is formed, thereby ensuring the high content of the iron carbon materialStrength at temperature.
The high temperature is understood to mean that the asphalt powder with a ring and ball softening point of 95-120 ℃ is high temperature.
In some embodiments, the hot water has a temperature of greater than or equal to 80 ℃. The water with the temperature of more than 80 ℃ is beneficial to promoting the toughness of the mixed materials, achieving the effect of trapping the materials and improving the molding rate during ball pressing.
In some embodiments, the non-coking coal fines are one or more of long flame coal, non-caking coal, weakly caking coal. The national institute of standards issued "national standards for Chinese coal Classification" (GB 5751-86) classifies coals into 14 classes 10 months in 1989. I.e., brown coal, long flame coal, non-caking coal, weakly caking coal, 1/2 medium caking coal, gas fat coal, 1/3 coking coal, fat coal, coking coal, lean coal, and anthracite. The invention mainly uses weak caking coal with poor coal formation, and coal with low or medium coalification degree has poor caking property and cannot be independently used for coking. Because of its special cause, weakly caking coals have a higher inert group content. Typical weakly caking coals are produced in Dashi province. Non-caking coal: the early coalification stage has been oxidized, so that it has the characteristic of low calorific value. The fuel is mainly used for power generation, gasification, civil fuel and the like. Non-caking coals are mainly produced in northwest regions of china. Long flame coal: the degree of coalification is the lowest of all bituminous coals. Which is known as long flame coal because of its long flame when burned. The fuel is mainly used for power generation, power station boiler fuel and the like. The long flame coal reserves in Liaoning province are the largest nationally. Brown coal: the lowest rank of all coals is characterized by high moisture, high oxygen content (about 15% -30%), and contains some humic acid. The method is mainly used for power generation and gasification.
In some embodiments, the non-coking coal fines have a particle size of-200 mesh;
and/or, the iron oxide has a particle size of-300 mesh;
and/or the granularity of the high-temperature accelerator is-200 meshes.
Wherein, -200 mesh is below 200 mesh, -300 mesh is below 300 mesh.
In some embodiments, the iron oxide comprises iron oxide powder, iron ore powder, concentrate powder, magnetic separatedFine mineral and Fe not easy to magnetic separation 2 O 3 Hematite powder and Fe capable of magnetic separation 3 O 4 One or more of the magnetite powders.
In some embodiments, a method of preparing an iron-carbon composite charge comprises:
after the raw materials are uniformly mixed, pelletizing the mixed materials to obtain a pellet;
carbonizing the ball material at 650-1050 ℃;
and directly spraying and cooling the carbonized ball material to obtain the iron-carbon composite furnace burden.
In some embodiments, the pelletizing pressure is greater than or equal to 500N;
the shape of the ball material after ball making is not limited, and the ball material can be round, olive, diamond, ellipse, quadrangle and the like, and is convenient for demoulding and production, for example, the diameter of the ball material after ball making is 30-60 mm, and the thickness is 20mm.
In some embodiments, the carbonizing comprises high temperature carbonizing or low temperature carbonizing;
the carbonization temperature of the high-temperature carbonization is 850-1050 ℃ and the time is 2.5-4 h;
the carbonization temperature of the low-temperature carbonization is 650-850 ℃ and the time is 3.5-5 h.
The purpose of carbonization is to remove the original volatile components of the material, and the main components of the volatile components are CO and H 2 These high-concentration reducing gases are removed simultaneously with FeO x React and reduce it to [ Fe]C after carbonization is equal to [ Fe ]]Reacting to obtain FeC 3 (excessive carbon) to form a hinge shape, and improve the strength of the material, thereby achieving the purpose of replacing coke.
The second aspect of the invention provides an iron-carbon composite furnace burden, which is prepared by the preparation method, wherein metal iron in the iron-carbon composite furnace burden is wrapped by C solid; the iron-carbon composite furnace burden prepared by the method can enter a blast furnace to ensure that the iron-carbon composite furnace burden does not scatter at a certain high temperature, so as to achieve the high-temperature effect of coke.
Preferably, the iron-carbon composite furnace burden comprises the following components:
wherein TFe is total iron content.
In order to make up the defect that non-coking coal (such as Jurassic coal and the like) has poor high-temperature cohesiveness and cannot be formed in a cold state, the invention adopts a method of adding iron oxide into materials, changes the particle size of furnace burden, and carries out carbonization treatment in a kiln which is not directly baked for one-step forming to obtain the iron-carbon composite furnace burden meeting the requirements.
In some embodiments, the Jurassic coal with ash content less than or equal to 12% is ground into fine powder with granularity of-200 meshes and proportion of more than 80%, the water content is based on smooth grinding production (water content is generally less than 8%), the granularity of ferric oxide powder or concentrate powder is below 300 meshes, and the high-temperature roasting carbonization accelerator is also below 200 meshes. The three materials are weighed according to the weight proportion of 61-84 parts of coal powder, 10-30 parts of iron oxide and 6-9 parts of high temperature accelerator, then added into a powerful mixing mill in an amount of 300kg without batch, added with 8-12 parts of water at 80 ℃ and mixed for 3-5 min, and then added into a pair roller ball press for pelletizing, wherein the ball milling diameter is preferably 30-60 mm, and the thickness is 20mm. The pressed ball materials can be stacked in addition, or can be directly put into a drying kiln for drying and then put into a rotary kiln carbonization chamber for direct carbonization treatment. The ball material is carbonized in a carbonization kiln at 650-1050 ℃ for 2h at high temperature and 3h at low temperature, and the carbonized material is directly sprayed with water for cooling, and the finished iron-carbon composite furnace charge is obtained after cooling.
The water with the temperature of more than 80 ℃ is beneficial to promoting the toughness of the mixed materials, achieves the effect of trapping the materials, and ensures the molding rate of more than 90 percent and the strength of more than or equal to 500N when the ball is pressed. The pulverized coal and the iron powder are fully and uniformly mixed in a strong mixer to ensure the rapid decomposition of the organic volatile matters of the pulverized coal, and the generated reducing atmosphere and FeO are x The reaction ensures that the reduction reaction can be carried out from inside to outside, the gaps left by the decomposition and escape of the pulverized coal are overflowed and filled by a high-temperature accelerator, and the gaps are filled, so that the loose ball materials are avoided, and the reduced FeO is obtained x The metal Fe and C are produced to form a hinge, so that the ball is strengthenedThe high temperature strength of the material, the metal iron is wrapped by a large amount of C solid, and the metal iron can be prevented from scattering when entering a blast furnace at a certain high temperature, so that the high temperature effect of coke is achieved. The generated metal Fe is used for carrying out indirect reduction reaction on CO+FeO at the furnace body indirect reduction reaction part of the blast furnace x ＝Fe+CO 2 Has the catalysis function, reduces the reaction temperature, and achieves the purposes of energy conservation and emission reduction.
Compared with the prior art, the invention has the following technical effects:
(1) Unlike coking coal, the non-coking coal has good cohesiveness and low high-temperature strength, and is difficult to apply in a blast furnace, the method adds iron oxide into the non-coking coal, changes the particle size of the furnace charge, and performs carbonization treatment in a non-direct roasting kiln for one-step forming to obtain the iron-carbon composite furnace charge capable of replacing the coking coal.
(2) The hot water with the temperature of more than 80 ℃ is added into the material, so that the toughness of the mixed material is facilitated, the effect of trapping the material is achieved, and the forming rate of the ball is ensured to be more than 90% when the ball is pressed by combining with certain required pressure (more than 500N).
(3) The invention ensures the rapid decomposition of the organic volatile matters of the coal dust by controlling the grain size of the materials and fully and uniformly mixing the mixed materials in the ballast mixer, and the generated reducing atmosphere is equal to FeO (FeO) x The reaction ensures that the reduction reaction can be carried out from inside to outside, the gaps left by the decomposition and escape of the pulverized coal are overflowed and filled by a high-temperature accelerator, and the gaps are filled, so that the loose ball materials are avoided, and the reduced FeO is obtained x The metal Fe and C form a hinge, so that the high-temperature strength of the ball material is enhanced, the metal iron is wrapped by a large amount of C solid, and the ball material can enter a blast furnace to ensure that the ball material does not scatter at a certain high temperature, thereby achieving the high-temperature effect of coke.
(4) The metal Fe generated in the reduction reaction process is subjected to CO+FeO at the indirect reduction reaction part of the blast furnace body x ＝Fe+CO 2 Has the catalysis function, reduces the reaction temperature, and achieves the purposes of energy conservation and emission reduction.
(5) The laboratory simulation test proves that the iron-carbon composite furnace burden can replace 10-30% of coke for the blast furnace, the cost is 300 yuan lower than that of the traditional coking coal due to the adoption of a large amount of non-caking coking coal, and the comprehensive energy consumption is reduced and the carbon emission is reduced by more than 10% due to the catalysis of indirect reduction reaction of metal Fe in the furnace body of the blast furnace. The production of the iron and carbon composite furnace burden is about 10 hundred million tons per year, the annual coke consumption is 5 hundred million tons per year, if the iron and carbon composite furnace burden is calculated as 10 percent, the cost is saved by 150 hundred million yuan per year, and the product becomes a low-carbon green environment-friendly furnace burden and provides possibility for solving the problem of the difficulty of iron and steel coke.
Drawings
FIG. 1 is a schematic flow chart of the iron-carbon composite furnace burden processing and manufacturing in the invention;
FIG. 2 is a photograph of an iron-carbon composite charge prepared in example 1 of the present invention;
FIG. 3 is an enlarged photograph of a single product of the iron-carbon composite charge prepared in example 1 of the present invention;
FIG. 4 is an AFM image of the iron-carbon composite charge prepared in example 1 of the present invention;
FIG. 5 is a photograph of an iron-carbon composite charge prepared in example 2 of the present invention;
FIG. 6 is a photograph of a cross section of an iron-carbon composite charge prepared in example 2 of the present invention.
Detailed Description
The technical scheme of the invention is described below through specific embodiments with reference to the accompanying drawings. It is to be understood that the reference to one or more steps of the invention does not exclude the presence of other methods and steps before or after the combination of steps, or that other methods and steps may be interposed between the explicitly mentioned steps. It should also be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. Unless otherwise indicated, the numbering of the method steps is for the purpose of identifying the method steps only and is not intended to limit the order of arrangement of the method steps or to limit the scope of the invention, which relative changes or modifications may be regarded as the scope of the invention which may be practiced without substantial technical content modification.
The raw materials and instruments used in the examples are not particularly limited in their sources, and may be purchased on the market or prepared according to conventional methods well known to those skilled in the art.
The schematic flow chart of the processing and manufacturing of the iron-carbon composite furnace burden is shown in figure 1, after non-coking coal, iron ore powder and a high-temperature accelerator are proportioned according to a certain proportion, hot water is put into a powerful mixer for quick mixing, and then the mixture is put into a powerful twin-roll pelleting machine through a conveying belt for pelleting, the pelleting mixed briquettes directly enter a preheating bin, and after being preheated, the mixture is sent into a carbonization chamber on the outer wall of a sleeve-type rotary kiln, and the inner barrel of the rotary kiln is used as a heating energy source. The heat energy is generated by decomposing the material balls to generate volatile gas, and the volatile gas is input into a high-temperature flue gas pipe of the inner container of the rotary kiln after being combusted by a combustion chamber, and the discharged hot waste gas is used as the material ball material for preheating and drying. In order to avoid the temperature of the high-temperature flue gas pipe exceeding a set value, a cold air distribution system is arranged beside the high-temperature flue gas pipe to regulate and stabilize the temperature in the high-temperature pipe. When the carbonized ball material is discharged, water is sprayed for rapid cooling, and the iron-carbon composite furnace material with smooth and homogeneous surface and no burning loss defect is obtained, and the components are as follows:
wherein TFe is total iron content.
Example 1
A preparation method of iron-carbon composite furnace burden comprises the following steps:
mixing according to the following proportion:
dwarfism coal powder: 64 parts;
iron ore powder: 30 parts;
high-temperature asphalt powder: 6 parts;
hot water at 80 ℃): 10 parts;
wherein, the particle size of the dwarf coal powder and the high-temperature asphalt powder is-200 meshes, the particle size of the iron ore powder is-300 meshes, the pelletizing pressure is 500N, and the obtained pellets are baked and roasted for 2.5 hours at 950 ℃ under the condition of not contacting oxygen, so as to obtain the finished iron-carbon composite furnace burden shown in figures 2 and 3.
Through testing, the compressive strength 3550N, the drum strength ID 78% and the reactivity CRI 68% of the iron-carbon composite furnace burden are obtained; fig. 4 is an AFM image of the iron-carbon composite charge prepared in this example, and it can be seen from the figure that the reduced FeOx produces metal Fe and C forming a hinge, and the metal iron is surrounded by a large amount of C solid.
Example 2
A preparation method of iron-carbon composite furnace burden comprises the following steps:
mixing according to the following proportion:
dwarfism coal powder: 66 parts;
iron ore powder: 25 parts;
high-temperature asphalt powder: 9 parts;
hot water at 90 ℃): 10 parts;
wherein, the particle size of the dwarf coal powder and the high-temperature asphalt powder is-300 meshes, the particle size of the iron ore powder is-300 meshes, the pelletizing pressure is 600N, and the obtained pellets are baked and baked for 4.0 hours at 650 ℃ under the condition of not contacting with oxygen, thus obtaining the finished iron-carbon composite furnace burden shown in fig. 5 and 6.
Through testing, the compressive strength 3350N, the drum strength ID 72% and the reactivity CRI 66% of the iron-carbon composite furnace burden are obtained.
Example 3
A preparation method of iron-carbon composite furnace burden comprises the following steps:
mixing according to the following proportion:
dwarfism coal powder: 84 parts;
iron ore powder: 10 parts;
high-temperature asphalt powder: 9 parts;
hot water at 80 ℃): 12 parts;
wherein, the particle size of the dwarf coal powder and the high-temperature asphalt powder is-200 meshes, the particle size of the iron ore powder is-300 meshes, the pelletizing pressure is 500N, and the obtained pellets are baked and baked for 2.5 hours at 1050 ℃ under the condition of not contacting oxygen, thus obtaining the finished iron-carbon composite furnace burden.
Through testing, the compressive strength of the prepared finished iron-carbon composite furnace burden is more than 3200N, and the strength of the rotary drum is more than 75%.
Example 4
A preparation method of iron-carbon composite furnace burden comprises the following steps:
mixing according to the following proportion:
dwarfism coal powder: 72 parts;
iron ore powder: 20 parts;
high-temperature asphalt powder: 8 parts;
hot water at 80 ℃): 8 parts;
wherein, the particle size of the dwarf coal powder and the high-temperature asphalt powder is-200 meshes, the particle size of the iron ore powder is-300 meshes, the pelletizing pressure is 500N, and the obtained pellets are baked and baked for 4 hours at 750 ℃ under the condition of not contacting with oxygen, thus obtaining the finished iron-carbon composite furnace burden.
Through testing, the compressive strength of the prepared finished iron-carbon composite furnace burden is more than 3200N, and the strength of the rotary drum is more than 75%.
Comparative example 1
This comparative example differs from example 1 in that no water was added.
Results: the material is difficult to form during pelletizing.
Comparative example 2
The present comparative example is different from example 1 in that the added water is warm water.
Results: the comparative example was relatively better molded than comparative example 1, but the molding rate was still low, less than 50%, and the transfer process was fragile and difficult to operate.
Comparative example 3
The comparative example is different from example 1 in that no iron ore powder was added.
Results: the graphitized product has low compressive strength, which is lower than 2000N, drum strength ID 13% and reactivity CPI 22%.
Comparative example 4
This comparative example differs from example 1 in that cold asphalt was used instead of high temperature asphalt powder.
Results: the materials are unevenly mixed and dispersed, the molding is difficult, and the carbonized product has loose structure. The cold asphalt replaces high-temperature asphalt powder to cause uneven material dispersion, and the high-temperature asphalt powder is ground powder, so that the materials are convenient to mix, but the specific gravity is light, and the high-temperature asphalt can be dispersed in the materials as much as possible under the action of high-temperature water, thereby playing a role in promoting the subsequent high-temperature carbonization process.
The foregoing descriptions of specific exemplary embodiments of the present invention are presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable one skilled in the art to make and utilize the invention in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (10)
1. The preparation method of the iron-carbon composite furnace burden is characterized in that the iron-carbon composite furnace burden comprises the following raw materials in parts by weight:
61-84 parts of non-coking coal powder;
10-30 parts of iron oxide;
6-9 parts of high-temperature accelerator;
8-12 parts of hot water.
2. The method according to claim 1, wherein the high temperature promoter is high temperature pitch powder and/or high temperature coal tar.
3. The method according to claim 1, wherein the hot water has a temperature of 80 ℃.
4. The method for producing coal according to claim 1, wherein the non-coking pulverized coal is one or more of long flame coal, non-caking coal, and weakly caking coal.
5. The method according to claim 1, wherein the non-coking coal fines have a particle size of-200 mesh;
and/or, the iron oxide has a particle size of-300 mesh;
and/or the granularity of the high-temperature accelerator is-200 meshes.
6. The method according to claim 1, wherein the iron oxide comprises iron oxide powder, iron ore powder, concentrate powder, fine ore after magnetic separation, fe which is not easily magnetic separation 2 O 3 Hematite powder and Fe capable of magnetic separation 3 O 4 One or more of the magnetite powders.
7. The method of manufacturing according to claim 1, comprising:
after the raw materials are uniformly mixed, pelletizing the mixed materials to obtain a pellet;
carbonizing the ball material at 650-1050 ℃;
and directly spraying and cooling the carbonized ball material to obtain the iron-carbon composite furnace burden.
8. The method of claim 7, wherein the pelletizing pressure is greater than or equal to 500N.
9. The method of claim 7, wherein the carbonization comprises high temperature carbonization or low temperature carbonization;
the carbonization temperature of the high-temperature carbonization is 850-1050 ℃ and the time is 2.5-4 h;
the carbonization temperature of the low-temperature carbonization is 650-850 ℃ and the time is 3.5-5 h.
10. An iron-carbon composite charge, characterized in that the iron-carbon composite charge is prepared by the preparation method of any one of claims 1-9, and metal iron in the iron-carbon composite charge is wrapped by C solid;
preferably, the iron-carbon composite furnace burden comprises the following components:
wherein TFe is total iron content.
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