CN117758000A - Eutectic flux for self-fluxing pellets and application method thereof - Google Patents
Eutectic flux for self-fluxing pellets and application method thereof Download PDFInfo
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- 239000008188 pellet Substances 0.000 title claims abstract description 77
- 230000005496 eutectics Effects 0.000 title claims abstract description 51
- 230000004907 flux Effects 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 38
- 238000005453 pelletization Methods 0.000 claims abstract description 27
- 229910052742 iron Inorganic materials 0.000 claims abstract description 17
- 239000000843 powder Substances 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 238000002844 melting Methods 0.000 claims abstract description 6
- 230000008018 melting Effects 0.000 claims abstract description 6
- 239000002245 particle Substances 0.000 claims abstract description 6
- 229910004298 SiO 2 Inorganic materials 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims abstract description 5
- 239000011230 binding agent Substances 0.000 claims description 23
- 239000002131 composite material Substances 0.000 claims description 19
- 239000002994 raw material Substances 0.000 claims description 14
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 9
- 150000002910 rare earth metals Chemical class 0.000 claims description 9
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 7
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 7
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 7
- 239000004571 lime Substances 0.000 claims description 7
- 239000011734 sodium Substances 0.000 claims description 7
- 229910052708 sodium Inorganic materials 0.000 claims description 7
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 7
- 229920000881 Modified starch Polymers 0.000 claims description 6
- 239000004115 Sodium Silicate Substances 0.000 claims description 6
- 239000001913 cellulose Substances 0.000 claims description 6
- 229920002678 cellulose Polymers 0.000 claims description 6
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 6
- 239000010459 dolomite Substances 0.000 claims description 4
- 229910000514 dolomite Inorganic materials 0.000 claims description 4
- 229920002907 Guar gum Polymers 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 239000000665 guar gum Substances 0.000 claims description 3
- 229960002154 guar gum Drugs 0.000 claims description 3
- 235000010417 guar gum Nutrition 0.000 claims description 3
- 238000005245 sintering Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 230000009467 reduction Effects 0.000 abstract description 10
- 239000007791 liquid phase Substances 0.000 abstract description 7
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 238000009792 diffusion process Methods 0.000 abstract description 3
- 238000010304 firing Methods 0.000 abstract description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 3
- 239000011707 mineral Substances 0.000 abstract description 3
- 238000010298 pulverizing process Methods 0.000 abstract description 3
- 239000007787 solid Substances 0.000 abstract description 3
- 238000002425 crystallisation Methods 0.000 abstract description 2
- 230000008025 crystallization Effects 0.000 abstract description 2
- 239000000440 bentonite Substances 0.000 description 8
- 229910000278 bentonite Inorganic materials 0.000 description 8
- 229940092782 bentonite Drugs 0.000 description 8
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 8
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 239000002893 slag Substances 0.000 description 5
- 238000003723 Smelting Methods 0.000 description 4
- 239000002253 acid Substances 0.000 description 4
- 239000012141 concentrate Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000000395 magnesium oxide Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 229920001732 Lignosulfonate Polymers 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- WETINTNJFLGREW-UHFFFAOYSA-N calcium;iron;tetrahydrate Chemical compound O.O.O.O.[Ca].[Fe].[Fe] WETINTNJFLGREW-UHFFFAOYSA-N 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000009149 molecular binding Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229940080314 sodium bentonite Drugs 0.000 description 1
- 229910000280 sodium bentonite Inorganic materials 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention belongs to the technical field of pelletizing ore of iron ore powder, and discloses a eutectic flux for self-fluxing pellets, which comprises the following components in percentage by mass: 20% -50% of CaO and Fe 2 O 3 10%~40%，SiO 2 2% -30% of Re and 1% -20% of Re. The eutectic flux is added before pelletizing and mixing, the added eutectic flux has low melting point, is quickly melted at the firing temperature of the green pellets, and undergoes a fierce physicochemical reaction with surrounding solid oxides to generate eutectic liquid phases containing more components, and mineral powder particles in pellets are bonded together along with the rapid flow, diffusion and cooling crystallization of the eutectic liquid phases in the pellets, so that the purposes of improving the alkalinity of the pellets, the strength of finished pellets, reducing the reduction expansion rate and reducing the reduction pulverization at low temperature are achieved.
Description
Technical Field
The invention belongs to the technical field of pelletizing ore of iron ore powder, and relates to a eutectic flux for self-fluxing pellets and a use method thereof.
Background
Pellets are one of main raw materials for blast furnace ironmaking, and have the advantages of uniform granularity, high strength, suitability for long-distance transportation and storage, good iron grade and good metallurgical performance, and are beneficial to improving the ventilation property of a material column and reducing the coke ratio during smelting. In recent years, the proportion of pellets in blast furnace ironmaking raw materials is increasing. According to the basicity of pellets, acidic pellets (basicity CaO/SiO) 2 <0.6 Self-fluxing pellets (flux-type pellets) (basicity CaO/SiO) 2 =0.6 to 1.2) and magnesia pellets. The acid pellet ore has high grade and good strength, and is convenient for long-distance transportation; meanwhile, most sintering plants produce high-alkalinity sintered ores, and acidic pellets are required to be matched for use so as to meet the requirements of blast furnace smelting. Therefore, the world still produces acid ballsThe agglomerate is mainly.
Pelletizing is a key step in the production of pellets, and is essentially the process of combining small discrete iron ore particles into larger agglomerates. The addition of the binder in the pelleting material can effectively improve the pelleting property of the pelleting material and improve the molecular binding force between particles in the green pellets, thereby improving the strength and the thermal stability of the green pellets. The acid pellet ore is often used as a binder, and the main components of the bentonite are silicon dioxide and aluminum oxide, and the dosage of the bentonite reaches 1.5% -3.5%. According to statistics, the pellet iron grade is reduced by 0.6% when the bentonite dosage is increased by 1%. Therefore, when the pellet ore is used in a blast furnace, lime flux and SiO are required to be added 2 And Al 2 O 3 Performing physical and chemical reaction to generate alkalinity (CaO/SiO) 2 ) 1.0 to 1.3 of blast furnace slag, thereby realizing blast furnace ironmaking effects such as slag-iron separation, desulfurization and the like. Therefore, the use of acid pellets in the blast furnace increases the lime flux amount, slag amount, fuel consumption and decreases the yield. The development of new binders capable of replacing bentonite is currently the main trend of pellet development. Later, people increase the alkalinity of pellets to the range of 0.6-1.2% by adding limestone powder and other methods into the iron concentrate powder to produce self-fluxing pellets, but the method still has the defects of high energy consumption and the like, and limits the application of the self-fluxing pellets.
Disclosure of Invention
Aiming at the technical problems, the invention provides a eutectic flux for self-fluxing pellets, which is added before pelletizing and mixing, has low melting point, is quickly melted at the firing temperature of the pellets, and is subjected to intense physicochemical reaction with surrounding solid oxides to generate eutectic liquid phases containing more components, and mineral powder particles in the pellets are bonded together along with the rapid flow, diffusion and cooling crystallization of the eutectic liquid phases in the pellets, so that the purposes of improving the alkalinity of the pellets, improving the strength of finished pellets, reducing the reduction expansion rate and reducing the reduction pulverization at low temperature are achieved.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
in a first aspect, the present invention provides a eutectic flux for self-fluxing pellets, the eutectic fluxThe agent comprises the following components in percentage by mass: 20-50% of CaO and Fe 2 O 3 10％～40％，SiO 2 2 to 30 percent of rare earth and 2 to 20 percent of rare earth.
The eutectic flux in the technical scheme of the invention also comprises the following components in percentage by mass: al (Al) 2 O 3 2％～30％。
The eutectic flux in the technical scheme of the invention also comprises the following components in percentage by mass: mgO 2-30%.
The eutectic flux is prepared from iron ore, lime, dolomite and rare earth raw materials through crushing, proportioning, mixing and melting, cooling and crystallizing, and crushing. Wherein the mixed melting is carried out in a high-temperature electric arc furnace, the furnace temperature is controlled at 1500-1800 ℃, and the prepared eutectic flux contains eutectic molecules such as calcium ferrite, calcium aluminate, calcium silicate and the like.
The granularity of the eutectic flux in the technical scheme of the invention is 100-200 meshes.
In a second aspect, the invention provides a method for using a eutectic flux for self-fluxing pellets, which comprises the following steps: mixing the eutectic flux and the iron fine powder for sintering, drying to obtain a dry-base pelletizing raw material, conveying the dry-base pelletizing raw material to a pelletizing disc, spraying a composite binder on the pelletizing disc during pelletizing operation to obtain green pellets, and roasting the green pellets to obtain self-fluxing pellets.
The usage amount of the eutectic flux in the technical scheme of the invention accounts for 1-3% of the mass of the iron concentrate powder.
The usage amount of the composite binder in the technical scheme of the invention accounts for 0.03-0.8% of the mass of the dry-basis pelletizing raw material.
The composite binder in the technical scheme of the invention comprises the following components in percentage by mass: 5-15% of sodium humate, 10-15% of guar gum, 20-40% of sodium silicate, 20-40% of cellulose and 20-40% of pregelatinized starch.
The composite binder in the technical scheme of the invention comprises the following components in percentage by mass: 5-15% of sodium humate, 10-15% of petri, 20-40% of sodium silicate, 20-40% of cellulose and 15-30% of pregelatinized starch.
The composite binder in the technical scheme of the invention is not limited to the components, such as water glass, diatomite, slaked lime, borate, fly ash, cement and bentonite in the inorganic binder, and carboxymethyl cellulose, polypropylene resin, lignosulfonate and polyvinyl alcohol in the organic binder, which can be any component of the composite binder.
Compared with the prior art, the invention has the beneficial effects that:
the eutectic flux is added before pelletizing and mixing, the composite binder is added in the pelletizing process, the added eutectic flux has low melting point, is quickly melted at the firing temperature of the pellets, and undergoes a fierce physicochemical reaction with surrounding solid oxides to generate eutectic liquid phases containing more components, and the eutectic liquid phases rapidly flow, diffuse and cool and crystallize in the pellets along with the rapid flow, diffusion and cooling of the eutectic liquid phases, so that mineral powder particles in the pellets are bonded together, and the purposes of improving the alkalinity of the pellets, reducing the strength of finished pellets, reducing the reduction expansion rate and reducing the reduction pulverization at low temperature are achieved.
The eutectic flux replaces part of sodium bentonite binder, so that the sodium load of a blast furnace is reduced, the fuel consumption for roasting pellets is reduced, the amount of blast furnace slag is reduced by about 35kg per ton of pellets, and the yield of the blast furnace can be increased by about 2% per ton of pellets.
Drawings
Fig. 1 is a process flow of producing self-fluxing pellets using the eutectic flux of the present invention.
Detailed Description
The following examples are illustrative of the present invention and are not intended to limit the scope of the invention. The technical means used in the examples are conventional means well known to those skilled in the art unless otherwise indicated. The test methods in the following examples are conventional methods unless otherwise specified.
Example 1
Taking iron concentrate as an example, from Shanxi dynasty county, the main components are: TFe 64.98%, siO 2 6.78％，CaO 0.86％，MgO0.74％，Mn 0.068％，P 0.025％S0.183%, water 10.18% and fineness 97.20%. Two eutectic fluxes and two composite binders are respectively designed according to the components and the contents of the iron concentrate.
In this example, 1t eutectic flux is taken as an example, 400kg of iron ore, 400kg of lime, 180kg of light burned dolomite and 20kg of rare earth are required. Wherein the main components and the contents of the iron ore are as follows: TFe 64.98%, siO 2 6.78%, caO0.86%, mgO 0.74%; the self-produced lime of the factory comprises the following main components in percentage by weight: caO 85.74%, siO 2 2.99 percent, mgO1.86 percent; the rare earth (Re) source is an inner Mongolian ferrule, and the main components and the content are as follows: nd 93.0%; the light burned dolomite comprises the following main components in percentage by weight: caO 44.71%, siO 2 1.20％，MgO 32.04％。
The raw materials are crushed to the grain size of 5 mm-45 mm, the raw materials are mixed and then are sent into an electric arc furnace to be subjected to arc striking, melted for 6-8 h, cooled and crystallized, and crushed to prepare the eutectic flux with 100-200 meshes. The eutectic flux 1 comprises the following components in percentage by weight: caO 38.32%, fe 2 O 3 39.02％，Al 2 O 3 3.01％，SiO 2 4.53 percent of rare earth 1.12 percent; the eutectic flux 2 comprises the following components in percentage by weight: 40.39% of CaO and Fe 2 O 3 38.48％，MgO 3.32％，SiO 2 4.41 percent of rare earth and 1.40 percent of rare earth.
The composite adhesive 1 of this embodiment is: 8kg of sodium humate, 12kg of guar gum, 35kg of sodium silicate, 15kg of cellulose and 30kg of pregelatinized starch; the composite binder 2 is: 8kg of sodium humate, 12kg of petri, 35kg of sodium silicate, 25kg of cellulose and 20kg of pregelatinized starch. The components of the composite binder are all commercial products.
Referring to the process flow chart shown in fig. 1, the two eutectic fluxes are respectively mixed with the iron fine powder, dried to obtain dry-base pelletizing raw materials, the dry-base pelletizing raw materials are conveyed to a pelletizing disc, two composite binders are respectively sprayed to the pelletizing disc during pelletizing operation to obtain green pellets, and then the green pellets are baked to obtain self-fluxing pellets. The bentonite binder was added during pelletization as a comparative example. The green ball quality index was measured as shown in table 1.
TABLE 1 Co-crystal flux Components
As is clear from Table 1, when the eutectic flux is added before the mixture is dried and the composite binder is sprayed during pelletizing, the indexes of green pellet falling times, compressive strength, bursting temperature and the like of the self-fluxing pellets produced and manufactured are equivalent to those of pure bentonite.
The green pellets of numbers 1 to 5 were heated and calcined to detect their compressive strengths at 950℃and 1250℃and the drum strength, reduction expansion rate and low temperature reduction index (RDI+3.15) at 500℃of the standard samples and examples were detected according to the national pellet detection standards, and the detection results are shown in Table 2 below.
TABLE 2 detection index of pellets
As can be seen from Table 2, when the co-crystal flux is added before the mixture is dried, and the composite binder is sprayed in the pelletizing process to pellet, 950 ℃ compressive strength, 1250 ℃ compressive strength, drum strength, reduction expansion rate, 500 ℃ low-temperature reduction degradation index RDI (+3.15) and the like of the obtained self-fluxing pellet finished pellets are equivalent to those of bentonite, so that the requirement of blast furnace production can be met, and the alkalinity also meets the alkalinity requirement of the self-fluxing pellet.
Example two
Smelting was performed with 5 pellets prepared in example 1. Each index was calculated based on 1t pellet, and the results are shown in table 3.
Table 3 various indices of smelting
| Numbering device | Slag amount, kg | Energy consumption, kg | Yield of kg |
| 1 | 71.75 | 23.94 | 568.25 |
| 2 | 2.32 | 0.77 | 637.68 |
| 3 | 3.09 | 1.03 | 636.91 |
| 4 | 3.87 | 1.29 | 636.13 |
| 5 | 4.64 | 1.55 | 635.36 |
In summary, the eutectic flux is added before mixing, and the composite binder is added on the balling disk, so that the grade of pellets is increased, the consumption of lime flux and slag of a blast furnace can be reduced, the coke ratio is reduced, and the yield is improved.
The above-mentioned embodiments are merely preferred embodiments of the present invention, which are not intended to limit the scope of the present invention, and other embodiments can be easily made by those skilled in the art through substitution or modification according to the technical disclosure in the present specification, so that all changes and modifications made in the principle of the present invention shall be included in the scope of the present invention.
Claims (10)
1. The eutectic flux for the self-fluxing pellet is characterized by comprising the following components in percentage by mass: 20% -50% of CaO and Fe 2 O 3 10%~40%，SiO 2 2%~30%，Re 1%~20%。
2. The eutectic flux for self-fluxing pellets of claim 1, further comprising the following components in percentage by mass: al (Al) 2 O 3 2%~30%。
3. The eutectic flux for self-fluxing pellets of claim 1, further comprising the following components in percentage by mass: mgO2% -30%.
4. A eutectic flux for self-fluxing pellets according to any of claims 1 to 3, wherein the eutectic flux is prepared from iron ore, lime, dolomite and rare earth raw materials by crushing, proportioning, mixing and melting, cooling and crystallizing, and crushing.
5. The eutectic flux for self-fluxing pellets of claim 1, wherein the eutectic flux has a particle size of 100 mesh to 200 mesh.
6. The method for using the eutectic flux for the self-fluxing pellets, as claimed in claim 1, is characterized by comprising the following steps: mixing the eutectic flux for sintering ore and the iron fine powder according to any one of claims 1-5, drying to obtain a dry-base pelletization raw material, conveying the dry-base pelletization raw material to a pelletization disc, spraying a composite binder to the pelletization disc during pelletization operation to obtain green pellets, and roasting the green pellets to obtain self-fluxing pellets.
7. The method for using the eutectic flux for the self-fluxing pellets, according to claim 6, wherein the usage amount of the eutectic flux is 1% -3% of the mass of the fine iron powder.
8. The method for using the eutectic flux for self-fluxing pellets of claim 6, wherein the composite binder accounts for 0.03% -0.8% of the mass of the dry-basis pelletizing raw materials.
9. The method for using the eutectic flux for the self-fluxing pellets, according to claim 6, wherein the composite adhesive comprises the following components in percentage by mass: 5-15% of sodium humate, 10-15% of guar gum, 20-40% of sodium silicate, 20-40% of cellulose and 20-40% of pregelatinized starch.
10. The method for using the eutectic flux for the self-fluxing pellets, according to claim 6, wherein the composite adhesive comprises the following components in percentage by mass: 5-15% of sodium humate, 10-15% of petri, 20-40% of sodium silicate, 20-40% of cellulose and 15-30% of pregelatinized starch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311711890.2A CN117758000A (en) | 2023-12-13 | 2023-12-13 | Eutectic flux for self-fluxing pellets and application method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311711890.2A CN117758000A (en) | 2023-12-13 | 2023-12-13 | Eutectic flux for self-fluxing pellets and application method thereof |
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| CN117758000A true CN117758000A (en) | 2024-03-26 |
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