Method for preparing high-alloy sinter by using oxide scale

Abstract

The invention relates to a method for preparing high-alloy sinter by using oxide scale, and belongs to the technical field of ironmaking sinter. In order to solve the problems of reduction obstacles and structural defects in preparation of sinter from high-alloy oxide scales in the prior art, the invention provides a method for preparing high-alloy sinter from oxide scales, which comprises the following steps: crushing oxide scales, blending oxide scale particles, iron ore powder, nickel ore, return mine, solvent and fuel to obtain a sintering mixture, and sintering the sintering mixture in a sintering furnace to obtain the high-alloy sinter from the oxide scales. The finished product sintered ore is obtained through granulation, material distribution ignition, sintering and cooling. By optimizing the raw material ratio and improving the sintering process parameters, the content of alloy elements of Cr, Ni and Mo in the finished sintered ore is increased, and the reducing performance, the soft melting characteristic and the mechanical strength of the sintered ore are remarkably improved. The drum index of the obtained finished product sintered ore reaches 75% or above, the air permeability of the blast furnace charging material is improved, and the dual purposes of resource utilization of the high-alloy oxide scale and improvement of the ironmaking production efficiency are achieved.

Description

Technical Field

[0001] This invention belongs to the field of iron sintering technology, and particularly relates to a method for preparing high alloy sinter using iron oxide scale. Background Technology

[0002] Iron oxide scale generated during the forging of special steel is rich in alloying elements such as Cr, Ni, Mo, and V. Recycling this scale for use in sinter production can improve sinter grade and reduce sintering fuel consumption. High-proportion sintering for alloying element enrichment can reduce steelmaking alloy costs and achieve resource recycling. However, due to its high alloy content, this type of iron oxide scale can have a series of negative effects during sintering. High-alloy iron oxide scale deteriorates the metallurgical properties of sinter, making it difficult to reduce stable oxides such as Cr2O3 and V2O5, thus reducing the reduction efficiency of sinter in the blast furnace. Simultaneously, elements such as Ni and Mo form low-melting-point eutectic phases, widening the softening range of the sinter and affecting blast furnace permeability. Furthermore, elements such as Cr and Ni in high-alloy iron oxide scale inhibit the conversion of Fe2O3 to Fe3O4, leading to insufficient liquid phase formation and a loose crystal structure, thereby reducing the strength of the sinter and consequently affecting the stability and efficiency of blast furnace smelting.

[0003] Therefore, although the recycling of high-alloy iron oxide scale has significant economic and environmental benefits, how to address its negative impact on metallurgical performance during sintering has become a key issue restricting the widespread adoption of this technology. Current technologies typically employ the method of adding large amounts of ordinary iron ore powder to dilute the concentration of alloying elements. While this can alleviate the deterioration of sinter performance to some extent, it reduces the utilization efficiency of the iron oxide scale, increases raw material costs, and fails to fundamentally solve the reduction barriers and structural defects caused by high-alloying elements. Therefore, there is an urgent need to develop a technical solution that can both efficiently utilize high-alloy iron oxide scale and improve the metallurgical performance of sinter, in order to maximize resource utilization and achieve stable and efficient ironmaking production. Summary of the Invention

[0004] To address the reduction barriers and structural defects encountered in the preparation of sinter from high-alloy iron oxide scale in existing technologies, this invention provides a method for preparing high-alloy sinter using iron oxide scale.

[0005] The technical solution of the present invention:

[0006] A method for preparing high-alloy sinter using iron oxide scale includes the following steps:

[0007] Step 1: Crushing the iron oxide scale:

[0008] The sheet-like iron oxide scale produced by hot rolling or forging is crushed, and iron oxide scale particles with a particle size of less than 5 mm are collected for later use.

[0009] Step 2, Ore Mixing:

[0010] The ore is blended according to the following mass percentages: 30-60% iron oxide scale particles, 10-40% iron ore powder, 6-8% nickel ore, 20-30% recycled ore, 2-6% solvent and 1-4% fuel to obtain a sintering mixture;

[0011] Step 3: Mixing and granulation:

[0012] The obtained sintered mixture is fed into a primary cylindrical mixer, water is added to wet the sintered mixture and it is mixed evenly. The evenly mixed sintered mixture is then fed into a secondary cylindrical mixer for granulation to obtain sintered particles.

[0013] Step 4: Ignite the fabric:

[0014] The obtained sintered particles are evenly distributed on the sintering machine trolley to obtain a sintered material layer with a thickness of 500~850mm. The sintering machine is ignited and the ignition temperature is controlled at 1000~1100℃, the ignition time is 1~3min, and the ignition negative pressure is 6000~10000Pa.

[0015] Step 5: Sintering and Cooling

[0016] After the sintering machine is ignited, the sintering negative pressure is controlled at 9000~17000Pa. After sintering, the sintered ore is cooled by an annular cooler, and sintered ore with an average particle size of 5~40mm is screened as finished sintered ore for use in the blast furnace.

[0017] Furthermore, in the sheet-like iron oxide scale described in step one, the mass percentage of Cr is 1~2.1%, the mass percentage of Ni is 0.57~1.28%, and the mass percentage of Mo is 0.281~0.447%.

[0018] Furthermore, the particle size of the iron oxide scale after sieving or crushing in step one is 0.5~5mm.

[0019] Furthermore, the iron ore powder mentioned in step two is a combination of hematite powder and magnetite concentrate; the mass ratio of hematite powder to magnetite concentrate is 1:1 to 1:3. The ore blending generally adheres to the principle of complementary basic characteristics. On this basis, if the proportion of iron oxide scale is further increased, the proportion of magnetite concentrate will be correspondingly reduced. The assimilation temperature of the sintering mixture obtained in step two is ≤1280℃, the liquid phase fluidity is 2 to 4, and the binder phase strength is not less than 800N.

[0020] Furthermore, the returned ore is powder or small particles generated during the crushing, screening, and transfer of sinter, pellets, or lump ore, including blast furnace returned ore and cold returned ore.

[0021] Furthermore, the solvent mentioned in step two is one or a combination of several of limestone powder, dolomite powder, or active lime powder; the basicity of the sintered mixture obtained in step two is 1.8~2.3 (CaO / SiO2), the TFe content is 56~60%, the MgO content is 1.5~2.5%, the Al2O3 content is 1.5~2.3%, and the FeO content is 7~12%.

[0022] Furthermore, the fuel mentioned in step two is one or both of coke powder and anthracite; for every 10% of iron oxide scale contained in the sintering mixture, the fuel ratio is reduced by 0.3%.

[0023] Furthermore, in step three, the water content of the sintering mixture is controlled at 6-8%, and the temperature of the sintering mixture is controlled in the form of steam at a temperature not lower than 55°C.

[0024] Furthermore, the granulation time in step three is 2 to 5 minutes, and the sintered particles with a particle size of not less than 3 mm account for 70 to 80% of the total mass of the sintered particles.

[0025] Furthermore, in step five, the sintering machine speed after ignition is 0.6~1.42m / min; the cooling is to cool the sintered ore to below 150℃ at a cooling rate of 5-20℃ / min.

[0026] Furthermore, in step five, the finished sinter with a particle size of 5-10 mm accounts for less than 23% of the total mass of the finished sinter.

[0027] The beneficial effects of this invention are:

[0028] This invention provides a method for preparing high-alloy sinter using iron oxide scale. By optimizing the raw material ratio and improving the sintering process parameters, the method achieves efficient utilization of high-alloy iron oxide scale, significantly improves the metallurgical properties of the sinter, and enhances its reduction efficiency and structural strength in blast furnace smelting.

[0029] This invention mixes high-alloy iron oxide scale with hematite powder, magnetite concentrate, flux, and fuel in a specific ratio. By controlling the basicity, moisture content, and particle size distribution of the mixture, suitable physicochemical conditions are created for the subsequent sintering process. The particle size of the iron oxide scale is controlled within the range of 0.5~5mm to avoid the negative impact of excessively large or small particles on permeability and strength, thus ensuring a more uniform distribution of the iron oxide scale in the sintering layer and improving permeability and sintering speed. The calcium-magnesium solvent reacts with SiO2 and Al2O3 in the iron oxide scale to generate high-melting-point calcium-aluminate silicates, which dilute the low-melting-point eutectic phase formed by Ni and Mo. Simultaneously, controlling the sintering temperature at 1000~1100℃ and optimizing the holding time further suppresses the excessive formation of low-melting-point phases. A ring cooler is used to rapidly cool the sinter, preventing the low-melting-point eutectic phase from precipitating or forming fine particles, reducing its impact on permeability. Rapid cooling also narrows the softening zone of the sinter, improving the airflow stability within the blast furnace.

[0030] By employing a dynamic fuel ratio adjustment mechanism, the fuel consumption is reduced by 0.3% for every 10% addition of iron oxide scale. This avoids excessive fuel consumption due to the oxidizing properties of the iron oxide scale while ensuring heat balance during sintering, maintaining a stable FeO content of 7-12% in the sinter and ensuring a binder phase strength of no less than 800N. Furthermore, setting the sintering layer thickness to 500-850mm, coupled with a sintering negative pressure of 9000-17000Pa, enhances the automatic heat storage capacity of the layer. Combined with the reducing atmosphere during sintering, this further promotes the conversion of Fe2O3 to Fe3O4, reducing the formation of difficult-to-reduc oxides such as Cr2O3 and V2O5, thereby improving the reducibility of the sinter.

[0031] The synergistic effect of the aforementioned technologies not only increases the alloying element content of Cr, Ni, and Mo in the finished sinter, but also significantly improves its reducibility, softening properties, and mechanical strength. The resulting finished sinter has a drum index exceeding 75%, and its reducibility and low-temperature reduction pulverization index are above 70%, reducing pulverization during transportation and within the blast furnace. After screening, the average particle size of the finished sinter is controlled at 20-25 mm, with 5-10 mm powder accounting for less than 23%, which not only improves the permeability of the blast furnace feed but also further reduces the dust generation rate. This achieves the dual goals of resource utilization of high-alloy iron oxide scale and improved ironmaking production efficiency, providing a practical and feasible technical approach for the large-scale recycling of high-alloy iron oxide scale, and possesses significant economic and environmental value. Attached Figure Description

[0032] Figure 1 A photograph of the finished sintered ore prepared in Example 1. Detailed Implementation

[0033] The technical solution of the present invention will be further described below with reference to embodiments, but it is not limited thereto. Any modifications or equivalent substitutions to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention should be covered within the protection scope of the present invention. In the following embodiments, the process equipment or apparatus not specifically specified are all conventional equipment or apparatus in the art. Unless otherwise specified, the raw materials used in the embodiments of the present invention are all commercially available; unless otherwise specified, the technical means used in the embodiments of the present invention are all conventional means well known to those skilled in the art.

[0034] Example 1

[0035] This embodiment provides a method for preparing high-alloy sinter using iron oxide scale, comprising the following steps:

[0036] Step 1: Crushing the iron oxide scale:

[0037] The sheet iron oxide scale used in this embodiment is produced by the forging workshop. The mass percentage of Cr in the sheet iron oxide scale is 1~2.1%, the mass percentage of Ni is 0.57~1.28%, and the mass percentage of Mo is 0.281~0.447%.

[0038] Use a cone crusher to crush flaky iron oxide scale to a particle size of less than 5 mm with more than 80% of the particles, and collect iron oxide scale particles with a particle size of 0.5~5 mm for later use;

[0039] Step 2, Ore Mixing:

[0040] The ore was blended according to the following mass percentages: 30% iron oxide scale particles, 6% hematite powder, 20% magnetite concentrate, 7% nickel ore, 25.6% recycled ore, 1.8% solvent active lime powder, 3% limestone powder, 3.5% dolomite powder and 3.1% fuel coke powder to obtain the sintering mixture.

[0041] In this embodiment, the return ore includes blast furnace return ore and cold return ore, with a mass ratio of blast furnace return ore to cold return ore of 3:2. Blast furnace return ore is iron-containing powder ore smaller than 5mm formed by screening sinter, pellets, lump ore, and other furnace materials in the blast furnace bins, which has the function of improving the particle size and permeability of sinter; cold return ore is powder smaller than 5mm that is screened out in the finished product process after the sinter has cooled.

[0042] The resulting sintered mixture has an alkalinity of CaO / SiO2 of 2.0, a TFe content of 58.6%, a MgO content of 1.9%, and an Al2O3 content of 1.5%.

[0043] The oxidation of 1 kg of FeO to Fe2O3 releases 1.973 kJ of heat. Therefore, 1 ton of iron oxide scale is equivalent to 0.0294 tons of sintered solid fuel. The calculation is as follows: 1t × 50% × 1.973 kJ × 0.239 kcal / 8000 kcal / kg = 0.0294t. Based on a 10% ratio and an estimated consumption of 110 kg / t, the fuel consumption is reduced by 0.0294t × 110 kg / t = 3.234 kg / t. Since the FeO content of the sinter is already at 8-9%, adding 110 kg / t of iron oxide scale is equivalent to reducing fuel consumption by 110 kg / t × (50%-9%) × 1.973 KJ × 0.239 kcal / 8000 Kcal / kg = 2.658 kg / t. This translates to a 0.3% reduction in the fuel ratio, meaning that for every 10% of iron oxide scale in the sinter mixture, the fuel ratio is reduced by 0.3%.

[0044] Step 3: Mixing and granulation:

[0045] The obtained sintered mixture is fed into a primary cylindrical mixer. Water is added at a ratio of 6.8 ± 0.3% to moisten the sintered mixture and mix it evenly. The temperature of the sintered mixture is controlled by steam at a temperature not lower than 55°C. The evenly mixed sintered mixture is then fed into a secondary cylindrical mixer for granulation. The granulation time is 4 minutes to obtain sintered particles. After drying, sintered particles with a particle size of 3 mm or larger account for 72% of the total mass of the sintered particles.

[0046] Step 4: Ignite the fabric:

[0047] The obtained sintered particles are evenly distributed on the sintering machine trolley to obtain a sintered material layer with a thickness of 850 mm. The sintering machine is ignited and the ignition temperature is controlled at 1050℃, the ignition time is 2 min, and the ignition negative pressure is 6000 Pa.

[0048] Step 5: Sintering and Cooling

[0049] After ignition, the sintering machine speed is controlled at 0.65 m / min. Fuel in the raw materials is burned under the action of exhaust fans, and the sintering negative pressure is controlled at 11000 Pa. An annular cooler is used to cool the sintered ore to below 150℃ at a cooling rate of 6.5℃ / min. Sintered ore with an average particle size of 20-25 mm is screened as finished sintered ore and supplied to the blast furnace. Finished sintered ore with a particle size of 5-10 mm accounts for less than 23% of the total mass of finished sintered ore, with a drum index of 78.76%.

[0050] Using the high-alloy sinter prepared in this embodiment for blast furnace smelting of alloy steels containing Cr, Ni or Mo, combined with 15-30% pellets and lump ore, can increase the enrichment of alloy elements in the current hot metal and reduce the amount of alloy used in steelmaking.

[0051] Example 2

[0052] This embodiment provides a method for preparing high-alloy sinter using iron oxide scale, comprising the following steps:

[0053] Step 1: Crushing the iron oxide scale:

[0054] The sheet iron oxide scale used in this embodiment is produced by the forging workshop. The mass percentage of Cr in the sheet iron oxide scale is 1~2.1%, the mass percentage of Ni is 0.57~1.28%, and the mass percentage of Mo is 0.281~0.447%.

[0055] Use a cone crusher to crush flaky iron oxide scale to a particle size of less than 5 mm with more than 80% of the particles, and collect iron oxide scale particles with a particle size of 0.5~5 mm for later use;

[0056] Step 2, Ore Mixing:

[0057] The ore was blended according to the following mass percentages: 20% iron oxide scale particles, 6% hematite powder, 30% magnetite concentrate, 7% nickel ore, 25.3% recycled ore, 1.8% solvent active lime powder, 3% limestone powder, 3.5% dolomite powder and 3.4% fuel coke powder to obtain the sintering mixture.

[0058] In this embodiment, the returned ore includes blast furnace returned ore and cold returned ore. The dust collector ash is fine powder produced by processes such as ironmaking and steelmaking. The mass ratio of blast furnace returned ore to cold returned ore is 3:2. Blast furnace returned ore is iron-containing powder ore smaller than 5mm formed by screening sinter, pellets, lump ore, and other furnace materials in the blast furnace bins. It has the function of improving the particle size and permeability of sinter. Cold returned ore is powder smaller than 5mm that is screened out after the sinter has cooled in the finished product process.

[0059] The resulting sintered mixture had an alkalinity of CaO / SiO2 of 1.9, a TFe content of 56.01%, a MgO content of 1.89%, and an Al2O3 content of 1.31%.

[0060] Step 3: Mixing and granulation:

[0061] The obtained sintered mixture is fed into a primary cylindrical mixer. Water is added at a ratio of 6.8 ± 0.3% to moisten the sintered mixture and mix it evenly. The temperature of the sintered mixture is controlled by steam at a temperature not lower than 55°C. The evenly mixed sintered mixture is then fed into a secondary cylindrical mixer for granulation. The granulation time is 4 minutes to obtain sintered particles. After drying, sintered particles with a particle size of 3 mm or larger account for 72% of the total mass of the sintered particles.

[0062] Step 4: Ignite the fabric:

[0063] The obtained sintered particles are evenly distributed on the sintering machine trolley to obtain a sintered material layer with a thickness of 850 mm. The sintering machine is ignited and the ignition temperature is controlled at 1050℃, the ignition time is 2 min, and the ignition negative pressure is 6000 Pa.

[0064] Step 5: Sintering and Cooling

[0065] After ignition, the sintering machine speed is controlled at 0.65 m / min. Fuel in the raw materials is burned under the action of exhaust fans, and the sintering negative pressure is controlled at 10000 Pa. An annular cooler is used to cool the sintered ore to below 150℃ at a cooling rate of 6.2℃ / min. Sintered ore with an average particle size of 20-25 mm is screened as finished sintered ore and supplied to the blast furnace. Finished sintered ore with a particle size of 5-10 mm accounts for less than 23% of the total mass of finished sintered ore, with a drum index of 78.68%.

[0066] Comparative Example 1

[0067] This comparative example provides a method for preparing sintered ore using iron oxide scale, comprising the following steps:

[0068] Step 1: Crushing the iron oxide scale:

[0069] The sheet iron oxide scale used in this embodiment is produced by the forging workshop. The mass percentage of Cr in the sheet iron oxide scale is 1~2.1%, the mass percentage of Ni is 0.57~1.28%, and the mass percentage of Mo is 0.281~0.447%.

[0070] Use a cone crusher to crush flaky iron oxide scale to a particle size of less than 5 mm with more than 80% of the particles, and collect iron oxide scale particles with a particle size of 0.5~5 mm for later use;

[0071] Step 2, Ore Mixing:

[0072] The ore mixture is prepared by mass percentage as follows: 2% iron oxide scale particles, 60% magnetite concentrate, 5% nickel ore, 17.5% recycled ore, 1.8% solvent active lime powder, 6.5% limestone powder, 3.2% dolomite powder and 4% fuel coke powder to obtain the sintering mixture.

[0073] In this embodiment, the return ore includes blast furnace return ore and cold return ore, with a mass ratio of blast furnace return ore to cold return ore of 3:2. Blast furnace return ore is iron-containing powder ore smaller than 5mm formed by screening sinter, pellets, lump ore, and other furnace materials in the blast furnace bins, which has the function of improving the particle size and permeability of sinter; cold return ore is powder smaller than 5mm that is screened out in the finished product process after the sinter has cooled.

[0074] The resulting sintered mixture has an alkalinity of CaO / SiO2 of 2.0, a TFe content of 55.86%, a MgO content of 1.8%, and an Al2O3 content of 1.4%.

[0075] Step 3: Mixing and granulation:

[0076] The obtained sintered mixture is fed into a primary cylindrical mixer. Water is added at a ratio of 6.8 ± 0.3% to moisten the sintered mixture and mix it evenly. The temperature of the sintered mixture is controlled by steam at a temperature not lower than 55°C. The evenly mixed sintered mixture is then fed into a secondary cylindrical mixer for granulation. The granulation time is 4 minutes to obtain sintered particles. After drying, sintered particles with a particle size of 3 mm or larger account for 72% of the total mass of the sintered particles.

[0077] Step 4: Ignite the fabric:

[0078] The obtained sintered particles are evenly distributed on the sintering machine trolley to obtain a sintered material layer with a thickness of 850 mm. The sintering machine is ignited and the ignition temperature is controlled at 1000℃, the ignition time is 2 min, and the ignition negative pressure is 6000 Pa.

[0079] Step 5: Sintering and Cooling

[0080] After ignition, the sintering machine speed is controlled at 0.68 m / min. Fuel in the raw materials is burned under the action of exhaust fans, and the sintering negative pressure is controlled at 9500 Pa. An annular cooler is used to cool the sintered ore to below 150℃ at a cooling rate of 6℃ / min. Sintered ore with an average particle size of 20-25 mm is screened as finished sintered ore and supplied to the blast furnace. Finished sintered ore with a particle size of 5-10 mm accounts for less than 23% of the total mass of finished sintered ore, with a drum index of 78.05%.

[0081] The chemical composition and metallurgical properties of the sintered ores prepared in Example 1 and Comparative Example 1 were tested using testing equipment such as wet scrubbing, fluorescence, and rotary drum testing. The results are shown in Table 1.

[0082] Table 1

[0083]

[0084] As shown in Table 1, compared with Comparative Example 1, the contents of alloying elements Cr, Ni, and Mo in the sinters obtained in Examples 1 and 2 increased significantly. This indicates that the method of the present invention can effectively enrich the alloying elements in the iron oxide scale into the sinter, significantly improving the alloying degree of the sinter. Meanwhile, the drum index of the sinter in Example 1 hardly decreased compared with Comparative Example 1. This indicates that the present invention can maintain its mechanical strength well while improving the alloying degree of the sinter, avoiding the problem of a significant decrease in the drum index of the sinter due to the introduction of alloying elements. This lays a good foundation for stabilizing furnace conditions and improving smelting efficiency in subsequent blast furnace smelting. This balance of performance is mainly due to the optimized design of the raw material ratio and the precise control of the sintering process parameters, which allows the alloying elements in the iron oxide scale to be evenly distributed and form a stable bond with other mineral phases during sintering, achieving both effective enrichment of alloying elements and ensuring the structural stability of the sinter. This process of preparing high-alloy sintered ore using iron oxide scale not only realizes the high-value utilization of industrial solid waste, but also reduces the dependence on traditional alloy raw materials, resulting in good economic and environmental benefits.

Claims

1. A method for preparing high-alloy sinter using iron oxide scale, characterized in that, Includes the following steps: Step 1: Crushing the iron oxide scale: The sheet-like iron oxide scale produced by hot rolling or forging is crushed, and iron oxide scale particles with a particle size of less than 5 mm are collected for later use. Step 2, Ore Blending: The ore is blended according to the following mass percentages: 30-60% iron oxide scale particles, 10-40% iron ore powder, 6-8% nickel ore, 20-30% recycled ore, 2-6% solvent and 1-4% fuel to obtain a sintering mixture; Step 3: Mixing and granulation: The obtained sintered mixture is fed into a primary cylindrical mixer, water is added to wet the sintered mixture and it is mixed evenly. The evenly mixed sintered mixture is then fed into a secondary cylindrical mixer for granulation to obtain sintered particles. Step 4: Ignite the fabric: The obtained sintered particles are evenly distributed on the sintering machine trolley to obtain a sintered material layer with a thickness of 500~850mm. The sintering machine is ignited and the ignition temperature is controlled at 1000~1100℃, the ignition time is 1~3min, and the ignition negative pressure is 6000~10000Pa. Step 5: Sintering and Cooling After the sintering machine is ignited, the sintering negative pressure is controlled at 8000~17000Pa. After sintering, the sintered ore is cooled by an annular cooler, and sintered ore with an average particle size of 5~40mm is screened as finished sintered ore for use in the blast furnace.

2. The method for preparing high-alloy sintered ore using iron oxide scale according to claim 1, characterized in that, The flaky iron oxide scale described in step one contains 1-2.1% Cr, 0.57-1.28% Ni, and 0.281-0.447% Mo by mass.

3. A method for preparing high-alloy sintered ore using iron oxide scale according to claim 1 or 2, characterized in that, The particle size of the iron oxide scale described in step one after sieving or crushing is 0.5~5mm.

4. The method for preparing high-alloy sintered ore using iron oxide scale according to claim 3, characterized in that, The iron ore powder mentioned in step two is a combination of hematite powder and magnetite concentrate; the mass ratio of the hematite powder and magnetite concentrate is 1:1 to 1:3, the assimilation temperature of the sintering mixture obtained in step two is ≤1280℃, the liquid phase fluidity is 2 to 4, and the binder phase strength is not less than 800N.

5. The method for preparing high-alloy sintered ore using iron oxide scale according to claim 4, characterized in that, The solvent mentioned in step two is one or a combination of several of limestone powder, dolomite powder or active lime powder; the basicity of the sintered mixture obtained in step two is CaO / SiO2 of 1.8~2.3, TFe content is 56~60%, MgO content is 1.5~2.5%, Al2O3 content is 1.5~2.3%, and FeO content is 7~12%.

6. The method for preparing high-alloy sintered ore using iron oxide scale according to claim 5, characterized in that, The fuel mentioned in step two is one or both of coke powder and anthracite; for every 10% of iron oxide scale contained in the sintering mixture, the fuel ratio is reduced by 0.3%.

7. The method for preparing high-alloy sintered ore using iron oxide scale according to claim 6, characterized in that, In step three, the water content of the sintering mixture is controlled at 6-8%, and the temperature of the sintering mixture is controlled in the form of steam at no less than 55°C.

8. The method for preparing high-alloy sintered ore using iron oxide scale according to claim 7, characterized in that, The granulation time in step three is 2 to 5 minutes, and the sintered particles with a particle size of not less than 3 mm account for 70 to 80% of the total mass of the sintered particles.

9. The method for preparing high-alloy sintered ore using iron oxide scale according to claim 8, characterized in that, The speed of the sintering machine after ignition in step five is 0.6~1.42m / min; the cooling is to cool the sinter to below 150℃ at a cooling rate of 5~20℃ / min.

10. The method for preparing high-alloy sintered ore using iron oxide scale according to claim 9, characterized in that, In step five, the finished sinter with a particle size of 5-10 mm accounts for less than 23% of the total mass of the finished sinter.

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