Production process for realizing fuel segregation based on sintering three-section material distribution

Abstract

The invention discloses a production process for realizing fuel segregation based on sintering three-section material distribution. The production process comprises the following steps: mixing an iron-containing mixture, crushed fuel, a calcium-containing flux, a magnesium-containing flux and a reclaimed material in proportion to obtain a first mixture; performing primary mixing on the first mixture, adding water for mixing, and performing secondary mixing for reinforced granulation; the first mixture obtained after secondary mixing is completed is distributed to a first mixing bin and a second mixing bin through a first plow distributor and a second plow distributor according to the proportion, coking fly ash and the first mixture are additionally added into the second mixing bin to form a second mixture, and the remaining first mixture enters a third mixing bin; and sequentially carrying out three-section material distribution on the sintering pallet for pre-paving the backing material through the mixing bins, and subsequently carrying out ignition, air draft sintering and cooling to obtain the sintered ore. The method has the advantages that the advantages of heat storage, quality improvement, energy conservation and emission reduction under the sintering of the thick material layer are exerted, low burnup under the sintering of the thick material layer is realized, and the sintering burnup is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of sintering, and in particular to a production process for realizing fuel segregation based on sintering three-stage material distribution. Background Art

[0002] Ultra-thick bed sintering is a major sintering technology recognized in the iron-making field for reducing carbon and improving quality. It is a key promotion technology for the new generation of steel manufacturing processes to achieve circular economy and green development. Sintering thick bed operations can give full play to the heat storage effect of the bed and reduce fuel consumption, but it needs to be matched with a suitable fuel segregation distribution process. It is a process technology that distributes a coarse-grained mixture with a lower carbon content in the middle and lower part of the trolley, and a fine-grained mixture with a higher carbon content in the middle and upper part of the trolley. It can effectively utilize the automatic heat storage effect in the sintering bed, reduce fuel consumption, and improve the quality of sintered ore.

[0003] When the material layer thickness increases to more than 900mm, some common industry problems such as sintering ore, quality decline, unobvious energy-saving effect, and failure to give full play to the advantages of ultra-high material layer sintering quality improvement, energy saving and emission reduction have restricted the further development of ultra-thick material layer sintering technology. The reason is that the segregation configuration of the fuel in the segregation cloth has become a key restriction point, that is, how to achieve precise mixing of fine particle mixture and fuel and arrange them on the upper part of the material layer has become a problem that needs to be solved. Common methods include reflective plates, multi-roller cloth, magnetic roller cloth, belt reflective cloth, sieve reflective cloth, air cloth, double-layer segregation cloth, etc. Various methods have been reported and studied at home and abroad, but the actual effects vary. Summary of the invention

[0004] The purpose of the present invention is to provide a production process for achieving fuel segregation based on three-stage sintering, so as to achieve the segregation of consumed fuel in the middle, give full play to the advantages of heat storage and quality improvement, energy saving and emission reduction under the sintering of thick material layers, achieve low fuel consumption under the sintering of thick material layers, and reduce sintering fuel consumption.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions:

[0006] A production process for realizing fuel segregation based on sintering three-stage distribution, characterized in that it comprises the following steps:

[0007] The iron-containing mixed material, the crushed fuel, the calcium-containing flux, the magnesium-containing flux, and the recycled material are mixed in proportion to obtain a first mixture;

[0008] The first mixture is mixed with water and then mixed with water and then granulated;

[0009] After the second mixing is completed, the first mixture is distributed to the first mixing bin and the second mixing bin respectively through the first plough type distributor and the second plough type distributor according to the proportion, the second mixing bin is further added with the coking dust removal ash and the first mixture to form the second mixture, and the remaining first mixture enters the third mixing bin;

[0010] The sintering trolley with pre-laid bottom material is distributed in three stages through the first mixing silo, the second mixing silo and the third mixing silo in turn, and then ignition, ventilation sintering and cooling are carried out to obtain sintered ore with quality that meets the requirements of the blast furnace.

[0011] Preferably, the calcium-containing flux comprises metallurgical lime powder and limestone powder, the recycled material is ore powder, the magnesium-containing flux is selected from one or two of dolomite powder, light-burned dolomite, and magnesite powder, and the iron-containing mixture, crushed fuel, metallurgical lime powder, limestone powder, magnesium-containing flux, and recycled material are respectively proportioned by weight as follows: (70-75): (3.7-4.1): (5-6): (1.5-3.0): (4-9): (8-10).

[0012] Preferably, the first mixture is mixed with water to obtain a water content of 7-8%.

[0013] Preferably, the first mixture distributed by the second plow type distributor and the coking dust ash distributed by the screw feeder enter into a high-power mixer and are stirred evenly before entering into a second mixing silo. The proportion of the first mixture in the second mixture is 99.7-99.8%, the proportion of the coking dust ash is 0.2-0.3%, and the carbon content of the coking dust ash is not less than 82%.

[0014] Preferably, the lower parts of the first mixing silo, the second mixing silo and the third mixing silo are equipped with feeding circular rollers and a five-roller segregation feeding system, and are arranged in sequence along the forward direction of the trolley, with the feeding points being 500 mm apart, and the five-roller segregation feeding system is at an angle of 55° to the horizontal.

[0015] Preferably, the diameter of the feeding round roller is 600 mm, the rotation speed is 7-10 r / min, and the height of the feeding point of the five-roller segregation feeding system corresponding to the first mixing silo, the first mixing silo and the third mixing silo is 350 mm, 850 mm and 1050 mm from the height of the grate bars of the sintering trolley respectively.

[0016] Preferably, the blanking thickness of the first mixing silo is controlled at 200-350mm, the blanking thickness of the second mixing silo is controlled at 400-500mm, the blanking thickness of the third mixing silo is controlled at 200-300mm, the thickness of the bottom material is controlled at 80-100mm, the bottom material is 10-25mm particle size finished sintered ore, and the total material layer thickness is controlled at 1000-1020mm.

[0017] Preferably, a double-layer loosener is arranged along the vertical section of the sintering trolley. The loosener is made of 06Cr25Ni20 material, has a diameter of 50mm and a length of 2.5m. The upper loosener is symmetrically arranged with the lower loosener, and a single upper loosener is located in the middle of two adjacent lower looseners in the height direction.

[0018] Preferably, the ignition uses coke oven gas as the heat source, the ratio of coke oven gas to combustion air is 1:6-8, at 330m 2 Control the coke oven gas flow rate in the sintering machine to 800~1000m 3 / h, adjust the combustion air flow rate and control the furnace temperature at 1050±50℃.

[0019] Preferably, the ferrous iron content of the sintered ore whose quality meets the requirements of blast furnace is controlled within a range of 7.9-9.5%.

[0020] In summary, the beneficial effects of the present invention are as follows: it solves the problems of unclear heat storage, quality improvement and carbon reduction effects in thick layer sintering, and realizes precise control of fuel distribution through the three-stage segregation distribution system, and solves the problem of sintered ore quality segregation due to excess fuel in the lower part and insufficient fuel in the upper part in the current sintering. The upper coal gas ignition provides heat and a reducing atmosphere, the middle high-carbon combustion reaction provides heat and a weak reducing atmosphere, and the lower part relies on partial fuel reaction and the strong heat storage effect of the ultra-high material layer, thereby reducing the sintering fuel consumption. The three-stage batching works synergistically to achieve the purpose of low-carbon sintering of thick material layers. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The present invention is a flow chart of a production process for realizing fuel segregation based on sintering three-stage distribution. DETAILED DESCRIPTION

[0022] The specific implementation manner of the present invention is further described below in conjunction with the accompanying drawings, and this embodiment does not constitute a limitation of the present invention.

[0023] like Figure 1 As shown, a production process for realizing fuel segregation based on sintering three-stage distribution includes the following steps:

[0024] The iron-containing mixed material, the crushed fuel, the calcium-containing flux, the magnesium-containing flux, and the recycled material are mixed in proportion to obtain a first mixture;

[0025] The first mixture is mixed with water for the first time, and then mixed with water for the second time for intensive granulation, wherein the water content of the first mixture after the first mixture is mixed with water is 7-8%;

[0026] After the second mixing is completed, the first mixture is distributed to the first mixing bin and the second mixing bin respectively through the first plough type distributor and the second plough type distributor according to the proportion, the second mixing bin is further added with the coking dust removal ash and the first mixture to form the second mixture, and the remaining first mixture enters the third mixing bin;

[0027] The sintering trolley with pre-laid bottom material is distributed in three stages through the first mixing silo, the second mixing silo and the third mixing silo in turn, and then ignition, ventilation sintering and cooling are carried out to obtain sintered ore with quality that meets the requirements of the blast furnace.

[0028] Calcium-containing flux includes metallurgical lime powder and limestone powder, which are adjusted according to the basicity requirement of sintered ore. The recycled material is ore powder. Magnesium-containing flux is selected from one or two of dolomite powder, light-burned dolomite and magnesite powder, which are adjusted according to the magnesium oxide requirement of sintered ore. The fuel particle size after crushing is required to be more than 75% of -3mm and no more than 25% of -0.5mm. The fuel after crushing is mainly adjusted according to the structure of sintered iron-containing raw materials. The iron-containing mixture, fuel after crushing, metallurgical lime powder, limestone powder, magnesium-containing flux and recycled material are respectively proportioned by weight as follows: (70-75): (3.7-4.1): (5-6): (1.5-3.0): (4-9): (8-10).

[0029] The first mixture distributed by the second plough type distributor and the coking dust ash distributed by the screw feeder enter into a strong mixer and are mixed evenly before entering into a second mixing silo to further achieve an enhanced granulation effect. The proportion of the first mixture in the second mixture is 99.7-99.8%, the proportion of the coking dust ash is 0.2-0.3%, and the carbon content of the coking dust ash is not less than 82%.

[0030] The first mixing silo, the second mixing silo and the third mixing silo are equipped with a discharge round roller and a five-roller segregation feeding system at the bottom, and are arranged in sequence along the forward direction of the trolley. The discharge points are 500mm apart, and the five-roller segregation feeding system forms an angle of 55° with the horizontal.

[0031] The diameter of the feeding round roller is 600mm, the rotation speed is 7-10r / min, and the height of the feeding point of the five-roller segregation feeding system corresponding to the first mixing silo, the first mixing silo and the third mixing silo is 350mm, 850mm and 1050mm from the grate height of the sintering trolley respectively.

[0032] The blanking thickness of the first mixing silo is controlled at 200-350mm, the blanking thickness of the second mixing silo is controlled at 400-500mm, the blanking thickness of the third mixing silo is controlled at 200-300mm, the thickness of the bottom material is controlled at 80-100mm, the bottom material is 10-25mm particle size finished sintered ore, and the total material layer thickness is controlled at 1000-1020mm.

[0033] A double-layer loosener is set along the vertical section of the sintering trolley. The loosener is made of 06Cr25Ni20 material, with a diameter of 50mm and a length of 2.5m. The upper loosener is symmetrically arranged with the lower loosener. The single loosener on the upper layer is located in the middle of the two adjacent looseners on the lower layer in the height direction.

[0034] Taking a 5m wide trolley as an example, 7 looseners are selected on the lower layer, and the distance between them and the grate bars of the sintering trolley is 400mm. The distance between the lower looseners is 500mm, and the fourth loosener is located in the center of the trolley. 6 looseners are selected on the upper layer, and the distance between them and the grate bars of the sintering trolley is 500mm.

[0035] Ignition selects coke oven gas as the heat source, the ratio of coke oven gas to combustion air is 1:6-8, at 330m 2 Control the coke oven gas flow rate in the sintering machine to 800~1000m 3 / h, adjust the combustion air flow rate, control the furnace temperature at 1050±50℃, achieve a certain amount of rich hydrogen and CO gas, and provide heat and partial reducing atmosphere for the sintering upper layer reaction.

[0036] The ferrous iron content of sintered ore that meets the quality requirements of blast furnaces is controlled within a range of 7.9-9.5%, and low-carbon sintering under thick material layers is achieved.

[0037] Example 1

[0038]

[0039] After the iron-containing mixture, calcium-containing flux, magnesium-containing flux, crushed fuel and recycled materials are mixed in the above proportions, after the first mixing and water mixing, and the second mixing and intensive granulation, the moisture content of the first mixture is 7.5%. The first mixture is distributed to the first mixing silo in proportion by the first plough divider, and the second plough divider distributes the first mixture to the strong mixer through the metering belt and enters the second mixing silo. The coking dust is input through the screw feeder at a ratio of 99.8:0.2 with the first mixture. After strong mixing, the high-carbon second mixture is obtained, and the rest enters the third mixing silo. and silos; each mixing silo is unloaded in turn after being unloaded by round rollers and a five-roller segregation feeding system; the feeding thicknesses are 200mm, 420mm, and 320mm, respectively; the thickness of the bottom material of the 10-25mm particle size finished sintered ore is controlled at 80mm, and the total material layer thickness is controlled at 1020m; after ignition by coke oven gas, the furnace temperature is controlled at 1050℃; the sintered ore that meets the requirements of blast furnaces is obtained, with a binary basicity of 2.0, magnesia of 2.4%, ferrous iron of 8.9%, strength of 77%, metallurgical properties of RDI+3.15, and reducibility of more than 70%.

[0040] Embodiment 2:

[0041]

[0042] After the iron-containing mixture, calcium-containing flux, magnesium-containing flux, crushed fuel and recycled materials are mixed in the above proportions, after the first mixing and water mixing, and the second mixing and intensive granulation, the moisture content of the first mixture is 7.5%; the first mixture is distributed to the first mixing silo in proportion by the first plough-type distributor, and the second plough-type distributor distributes the first mixture to the strong mixer through the metering belt and enters the second mixing silo, and the coking dust is input through the screw feeder at a ratio of 99.8:0.2 with the first mixture, and the high-carbon second mixture is obtained after strong mixing, and the rest enters the third mixing silo. Silo; each mixed silo is unloaded in turn after being unloaded by round rollers and a five-roller segregation distribution system; the distribution thicknesses are 200mm, 420mm, and 320mm respectively, the thickness of the bottom material of the 10-25mm particle size finished sintered ore is controlled at 80mm, and the total material layer thickness is controlled at 1020m; after ignition by coke oven gas, the furnace temperature is controlled at 1050℃; the sintered ore that meets the requirements of the blast furnace is obtained, with a binary basicity of 2.05, magnesia of 2.4%, ferrous iron of 8.8%, a strength of 77.01%, metallurgical properties of RDI+3.15, and reducibility of more than 70%.

[0043] Embodiment 3:

[0044]

[0045]

[0046] After the iron-containing mixture, calcium-containing flux, magnesium-containing flux, crushed fuel and recycled materials are mixed in the above proportions, after the first mixing and water mixing, and the second mixing and intensive granulation, the moisture content of the first mixture is 7.5%; the first mixture is distributed to the first mixing silo in proportion by the first plough-type distributor, and the second plough-type distributor distributes the first mixture to the strong mixer through the metering belt and enters the second mixing silo, and the coking dust is input through the screw feeder at a ratio of 99.8:0.2 with the first mixture, and the high-carbon second mixture is obtained after strong mixing, and the rest enters the third mixing silo. Silo; each mixed silo is unloaded in turn after being unloaded by round rollers and a five-roller segregation distribution system; the distribution thicknesses are 200mm, 420mm, and 320mm respectively, the thickness of the bottom material of the 10-25mm particle size finished sintered ore is controlled at 80mm, and the total material layer thickness is controlled at 1020m; after ignition by coke oven gas, the furnace temperature is controlled at 1050℃; the sintered ore that meets the requirements of the blast furnace is obtained, with a binary basicity of 2.04, magnesia of 2.53%, ferrous iron of 9.0%, strength of 77.35%, metallurgical properties of RDI+3.15, and reducibility of more than 70%.

[0047] Embodiment 4:

[0048]

[0049] After the iron-containing mixture, calcium-containing flux, magnesium-containing flux, crushed fuel and recycled materials are mixed in the above proportions, after the first mixing and water mixing, and the second mixing and intensive granulation, the moisture content of the first mixture is 7.5%; the first mixture is distributed to the first mixing silo in proportion by the first plough-type distributor, and the second plough-type distributor distributes the first mixture to the strong mixer through the metering belt and enters the second mixing silo, and the coking dust is input through the screw feeder at a ratio of 99.8:0.1 with the first mixture, and the high-carbon second mixture is obtained after strong mixing, and the rest enters the third mixing silo. Silo; each mixed silo is unloaded in turn after being unloaded by round rollers and a five-roller segregation distribution system; the distribution thicknesses are 200mm, 420mm, and 320mm respectively, the thickness of the bottom material of the 10-25mm particle size finished sintered ore is controlled at 80mm, and the total material layer thickness is controlled at 1020m; after ignition by coke oven gas, the furnace temperature is controlled at 1050℃; the sintered ore that meets the requirements of the blast furnace is obtained, with a binary basicity of 2.04, magnesia of 2.53%, ferrous iron of 8.5%, strength of 76.35%, metallurgical properties of RDI+3.15, and reducibility of more than 70%.

[0050] Embodiment 5:

[0051]

[0052] After the iron-containing mixture, calcium-containing flux, magnesium-containing flux, crushed fuel and recycled materials are mixed in the above proportions, after the first mixing and water mixing, and the second mixing and intensive granulation, the moisture content of the first mixture is 7.5%; the first mixture is distributed to the first mixing silo in proportion by the first plough-type distributor, and the second plough-type distributor distributes the first mixture to the strong mixer through the metering belt and enters the second mixing silo, and the coking dust is input through the screw feeder in a ratio of 99.8:0.2 with the first mixture. After strong mixing, the high-carbon second mixture is obtained, and the rest enters the third mixing silo. and silos; each mixing silo is unloaded in turn after being unloaded by round rollers and a five-roller segregation feeding system; the feeding thicknesses are 200mm, 420mm, and 320mm respectively, the thickness of the bottom material of the 10-25mm particle size finished sintered ore is controlled at 80mm, and the total material layer thickness is controlled at 1020m; after ignition by coke oven gas, the furnace temperature is controlled at 1050℃; the sintered ore that meets the requirements of blast furnaces is obtained with a binary basicity of 2.0, magnesia of 2.4%, ferrous iron of 8.7%, strength of 77%, metallurgical properties of RDI+3.15, and reducibility of more than 70%.

[0053] Comparative Example 1:

[0054] materials Ratio TFe C <![CDATA[SiO2]]> CaO MgO <![CDATA[Al2O3]]> <![CDATA[H2O]]> Iron-containing mixture 73％ 60.33 5.32 0.52 0.29 2.15 8.49 Metallurgical powder ash 5.3％ 0.40 79.00 2.50 0.40 0.50 Limestone powder 1.8％ 1.60 52.42 1.50 2.00 Dolomite powder 6.90％ 1.10 31.20 20.50 0.17 2.00 Crushed fuel 3.8％ 84.00 4.00 0.50 0.20 3.60 2.00 Recycled material (ore powder) 10％ 55.62 5.26 10.51 2.40 2.21 0.50

[0055] After the iron-containing mixed material, calcium-containing flux, magnesium-containing flux, crushed fuel, recycled materials, etc. are mixed in the above proportions, after the first mixing and water mixing, and the second mixing and intensive granulation, the moisture content of the first mixture is 7.5%; after the round roller unloading and the five-roller segregation distribution system, the thickness of the bottom material of the 10-25mm particle size finished sintered ore is controlled at 80mm, and the total material layer thickness is controlled at 1020m; after ignition with coke oven gas, the furnace temperature is controlled at 1050℃; the sintered ore with binary basicity of 2.00, magnesium oxide of 2.40%, ferrous iron of 8.2%, strength of 75.65%, metallurgical properties of RDI+3.15, and reducibility of more than 70% is obtained, and the strength deviation of the sintered ore is

[0056] Comparative Example 2:

[0057] materials Ratio TFe C <![CDATA[SiO2]]> CaO MgO <![CDATA[Al2O3]]> <![CDATA[H2O]]> Iron-containing mixture 73％ 59.66 5.49 0.34 0.26 2.52 8.43 Metallurgical powder ash 5.3％ 0.40 79.00 2.50 0.40 0.50 Limestone powder 1.8％ 1.10 31.20 20.50 0.17 2.00 Dolomite powder 6.90％ 1.10 31.20 20.50 0.17 2.00 Crushed fuel 4.1％ 84.00 4.00 0.50 0.20 3.60 2.00 Recycled material (ore powder) 10％ 55.57 5.27 10.52 2.40 2.22 0.50

[0058] After the iron-containing mixed material, calcium-containing flux, magnesium-containing flux, crushed fuel and recycled material are mixed in the above proportions, after the first mixing and water mixing and the second mixing and intensive granulation, the moisture content of the first mixture is 7.5%; after the round roller unloading and the five-roller segregation distribution system, the thickness of the bottom material of the 10-25mm particle size finished sintered ore is controlled at 80mm, and the total material layer thickness is controlled at 1020m; after ignition with coke oven gas, the furnace temperature is controlled at 1050℃; the sintered ore with binary basicity of 2.00, magnesium oxide of 2.41%, ferrous iron of 8.5%, strength of 77.64%, metallurgical properties of RDI+3.15, and reducibility of more than 70% is obtained, and the fuel consumption of the sintered ore is relatively high.

[0059] The present invention mainly solves the following problems: 1. The heat storage, quality improvement and carbon reduction effects of thick material layer sintering are not obvious; 2. The segregation distribution fails to completely solve the segregation arrangement of carbon, resulting in the segregation of sintered ore quality due to excess fuel in the lower part and insufficient fuel in the upper part, and in order to ensure the quality of the middle and upper parts, the fuel ratio will be increased in the sintering ingredients, resulting in a waste of sintering fuel, which is contrary to the low-carbon sintering process path.

[0060] The present invention adopts three-stage sintering distribution, with a low-carbon mixture in the lower part, which uses the heat storage effect of the material layer to provide heat and the combustion of carbon to provide a weak reducing atmosphere; the middle part is a high-carbon mixture, which uses the combustion of carbon to provide heat and a reducing atmosphere; the upper part uses the combustion of coke oven gas and carbon to provide the heat required for the upper layer reaction; finally, the consumed fuel is segregated in the middle part, giving play to the advantages of heat storage and quality improvement, energy saving and emission reduction under the sintering of thick material layers, achieving low fuel consumption under sintering of thick material layers, and reducing the sintering fuel consumption by 6-8kg / t.

[0061] The present invention is a production method for realizing fuel segregation based on three-stage sintering distribution. After the iron-containing mixed material, crushed fuel, calcium-containing flux, magnesium-containing flux, recycled material and the like are mixed in proportion, the mixed material is mixed by adding water in the first mixing and intensive granulation in the second mixing, and then enters the three mixing bins at the head of the sintering trolley. Round roller distribution is arranged under the first and third mixing bins, and a vertical strong mixer is arranged on the second mixing bin. Coking dust removal ash is sprayed into the mixed material in proportion to increase the carbon content of the mixed material in the second mixing bin. After the round roller segregation distribution is sequentially passed, the mixed material enters the sintering trolley, so as to achieve the segregation distribution of high carbon in the middle part and low carbon in the upper and lower parts along the vertical section of the sintering. The upper part uses the combustion of coke oven gas to provide heat, the middle part relies on the high carbon combustion to supplement heat, and the lower part relies on the heat storage effect of the material layer. The three-stage distribution synergistic effect achieves the purpose of low-carbon sintering of thick material layer.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions should also be deemed to fall within the protection scope of the technical solution of the present invention.

Claims

1. A production process for achieving fuel segregation based on sintering three-stage distribution, characterized in that: The steps include: The iron-containing mixed material, the crushed fuel, the calcium-containing flux, the magnesium-containing flux, and the recycled material are mixed in proportion to obtain a first mixture; The first mixture is mixed with water and then mixed with water and then granulated; After the second mixing is completed, the first mixture is distributed to the first mixing bin and the second mixing bin respectively through the first plough type distributor and the second plough type distributor according to the proportion, the second mixing bin is further added with the coking dust removal ash and the first mixture to form the second mixture, and the remaining first mixture enters the third mixing bin; The sintering trolley with pre-laid bottom material is distributed in three stages through the first mixing silo, the second mixing silo and the third mixing silo in turn, and then ignition, ventilation sintering and cooling are carried out to obtain sintered ore with quality that meets the requirements of the blast furnace.

2. A production process for realizing fuel segregation based on sintering three-stage distribution according to claim 1, characterized in that: The calcium-containing flux comprises metallurgical lime powder and limestone powder, the recycled material is ore powder, the magnesium-containing flux is selected from one or two of dolomite powder, light-burned dolomite, and magnesite powder, and the iron-containing mixed material, crushed fuel, metallurgical lime powder, limestone powder, magnesium-containing flux, and recycled material are respectively proportioned by weight as follows: (70-75): (3.7-4.1): (5-6): (1.5-3.0): (4-9): (8-10).

3. The production process for realizing fuel segregation based on sintering three-stage distribution according to claim 1 is characterized in that: After the first mixture is mixed with water, the water content is 7-8%.

4. The production process for realizing fuel segregation based on sintering three-stage distribution according to claim 1, characterized in that: The first mixture distributed by the second plow type distributor and the coking dust ash distributed by the screw feeder enter into a high-power mixer and are mixed evenly before entering into a second mixing silo. The proportion of the first mixture in the second mixture is 99.7-99.8%, the proportion of the coking dust ash is 0.2-0.3%, and the carbon content of the coking dust ash is not less than 82%.

5. The production process for realizing fuel segregation based on sintering three-stage distribution according to claim 1, characterized in that: The lower parts of the first mixing silo, the second mixing silo and the third mixing silo are equipped with feeding circular rollers and a five-roller segregation feeding system, and are arranged in sequence along the forward direction of the trolley. The feeding points are 500mm apart, and the five-roller segregation feeding system forms an angle of 55° with the horizontal.

6. The production process for realizing fuel segregation based on sintering three-stage distribution according to claim 1, characterized in that: The diameter of the feeding round roller is 600mm, and the rotation speed is 7-10r / min. The height of the feeding point of the five-roller segregation feeding system corresponding to the first mixing silo, the first mixing silo and the third mixing silo is 350mm, 850mm and 1050mm from the grate height of the sintering trolley respectively.

7. The production process for realizing fuel segregation based on sintering three-stage distribution according to claim 1, characterized in that: The blanking thickness of the first mixing silo is controlled at 200~350mm, the blanking thickness of the second mixing silo is controlled at 400~500mm, the blanking thickness of the third mixing silo is controlled at 200~300mm, the thickness of the bottom material is controlled at 80~100mm, the bottom material is 10~25mm particle size finished sintered ore, and the total material layer thickness is controlled at 1000~1020mm.

8. The production process for realizing fuel segregation based on sintering three-stage distribution according to claim 1 is characterized in that: A double-layer loosener is arranged along the vertical section of the sintering trolley. The loosener is made of 06Cr25Ni20 material, has a diameter of 50mm and a length of 2.5m. The upper loosener is symmetrically arranged with the lower loosener. The upper single loosener is located in the middle of the two adjacent looseners in the lower layer in the height direction.

9. The production process for realizing fuel segregation based on sintering three-stage distribution according to claim 1, characterized in that: The ignition uses coke oven gas as the heat source, the ratio of coke oven gas to combustion air is 1:6-8, at 330m 2 Control the coke oven gas flow rate in the sintering machine 800~1000m 3 / h, adjust the combustion air flow rate and control the furnace temperature at 1050±50℃.

10. The production process for realizing fuel segregation based on sintering three-stage distribution according to claim 1, characterized in that: The ferrous iron content of the sintered ore whose quality meets the requirements of blast furnace is controlled within the range of 7.9-9.5%.

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