CN111996367A - Method for utilizing superfine coal powder in sintering and sintering mixture - Google Patents
Method for utilizing superfine coal powder in sintering and sintering mixture Download PDFInfo
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- CN111996367A CN111996367A CN202010879420.7A CN202010879420A CN111996367A CN 111996367 A CN111996367 A CN 111996367A CN 202010879420 A CN202010879420 A CN 202010879420A CN 111996367 A CN111996367 A CN 111996367A
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- sintering
- fuel
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- iron ore
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
Abstract
The invention belongs to the technical field of ferrous metallurgy sintering, and discloses a method for utilizing superfine coal powder in sintering and a sintering mixture, wherein the superfine fuel is obtained by screening the sintering fuel, the superfine fuel is further finely ground to be below 200 meshes and accounting for 60-80%, and then the superfine fuel is mixed with part of iron ore powder for pelletizing, the mixing ratio of the superfine fuel to the iron ore powder is 0.35-0.55% in terms of carbon content (calculated by carbon-oxygen molar ratio), and the diameter of a small pellet is controlled to be 3-8mm and accounting for more than 90%. And mixing the rest iron ore powder, the flux and the coarse grain fuel according to a conventional mode for granulation. After the pellet and the granulated material are mixed, the sintering process is finished in the sintering machine for material distribution sintering, cooling and screening, etc., the sintering ignition negative pressure is 5.5-6.9kPa, the ignition temperature is 1050-minus-one 1150 ℃, the negative pressure in the sintering process is controlled to be 7.5-9.5kPa, and the material layer thickness is controlled to be 850-minus-one 1000 mm. The invention can effectively utilize the superfine coal powder in the sintering process, thereby widening the application of the superfine coal powder and improving the quality of sintered ore.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy sintering, and mainly relates to a method for utilizing superfine coal powder in sintering and a sintering mixture.
Background
The sintering process is to bake iron-containing fine ore and concentrate ore at high temperature into raw materials which have certain granularity, strength and stable chemical components and are suitable for blast furnace smelting, and is an important process for smelting iron and steel at present. The technical indexes of the sinter directly influence the smelting effect, production cost and product quality of the blast furnace. The common sintering fuel crushing process is an open-circuit process, the grain size composition of the sintering fuel cannot be effectively controlled, the fuel is over-crushed, wherein the fuel (namely the superfine coal powder) with the grain size smaller than 1mm reaches more than 40%, the superfine coal powder in the sintering fuel accounts for a relatively large proportion, the superfine coal powder is not directly used as the fuel for combustion in the sintering process at present, but the superfine coal powder is screened out and then used for other use or waste, and if the superfine coal powder is not used for waste, the waste of resources is caused. Since the particle size of the ultra-fine pulverized coal is small, if the directly pulverized fuel containing the ultra-fine pulverized coal is combusted, the ultra-fine pulverized coal deteriorates the air permeability of the fuel, and increases the coal consumption and the sintering quality. The sintering process is also a relatively energy-consuming process, if the superfine coal powder can be reasonably utilized, the purposes of the superfine coal powder can be widened, and meanwhile, the unnecessary transportation problem of the superfine coal powder is also avoided.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a method for utilizing superfine coal powder in sintering and a sintering mixture.
The purpose of the invention is realized by the following technical scheme:
a method for utilizing superfine coal powder in sintering comprises the following steps:
screening the sintered fuel to obtain a first fuel with the particle size of more than 1mm and a second fuel with the particle size of less than or equal to 1 mm;
carrying out primary mixing and secondary mixing on a first fuel, part of iron ore powder and other sintering raw materials to obtain a first mixture, wherein the part of iron ore powder is 55-90% of the iron ore powder by mass;
grinding the second fuel, wherein materials with the particle size of less than 200 meshes account for 60-80% of the mass of the second fuel in the ground second fuel, mixing the ground second fuel with the residual iron ore powder, and pelletizing to obtain mixed material pellets;
uniformly mixing the first mixture with the mixture balls to obtain a final mixture;
the final mix was used for sintering.
Preferably, the fuel is one or a mixture of more of coke powder, semi coke and anthracite.
Preferably, in the first mixture, the content of the iron ore powder with the granularity of 0.5-3.0mm is not less than 70% of the total mass of the part of the iron ore powder.
Preferably, the carbon ratio of the sintering fuel is 2.6-4.3% by the content of fixed carbon, and the carbon ratio in the mixed pellet is 0.35-0.55% by the molar ratio of carbon to oxygen.
Preferably, the final mixture is used for sintering, and during the cloth sintering, the sintering ignition negative pressure is 5.5-6.9kPa, the ignition temperature is 1050-1150 ℃, and the negative pressure in the sintering process is controlled to be 7.5-9.5 kPa.
Preferably, when the final mixture is used for sintering, the thickness of the material layer is controlled to be 850-1000 mm.
The invention also provides a sintering mixture, which comprises the following first mixture and mixed material balls:
the mixed material balls are prepared by mixing and pelletizing a sintering fuel with the particle size of less than or equal to 1mm and a part of iron ore powder in the sintering mixture, wherein in the sintering fuel with the particle size of less than or equal to 1mm, the mass of materials below 200 meshes accounts for 60-80%;
the first mixture is obtained by primary mixing and secondary mixing of a solvent, a sintering fuel with the grain size larger than 1mm and the rest of iron ore powder in the sintering mixture;
wherein the mass of the iron ore powder in the mixture ball accounts for 55-90% of the mass of the iron ore powder in the sintering mixture.
Preferably, the solvent is quicklime and/or limestone.
Preferably, the sinter mix further comprises return fines.
Compared with the prior art, the invention has the following beneficial effects:
the utilization method of the superfine coal powder in sintering of the invention screens the sintering fuel, grinds the second fuel with the grain diameter less than or equal to 1mm and prepares the second fuel and the iron ore powder into mixed material balls, the first mixed material and the mixed material balls are mixed uniformly to obtain a final mixed material, and the obtained final mixed material has relatively uniform components, can reduce the segregation of the sintering ore during sintering, improves the quality of the sintering ore and simultaneously enables the superfine coal powder to be well applied. Wherein, the material below 200 meshes accounts for 60-80% of the mass of the second fuel, so as to obtain the green ball with qualified performance meeting the cloth requirement. The process of the invention is simple, the change of the traditional sintering process is small, and the practicability is strong; improves the structure of well-sintered fuel, enlarges the selection range of fuel, thereby reducing the production cost.
Further, the final mixture is used for sintering, when the material is distributed and sintered, the sintering ignition negative pressure is 5.5-6.9kPa, the ignition temperature is 1050-1150 ℃, and the negative pressure in the sintering process is controlled to be 7.5-9.5 kPa. In the sintering process, compared with conventional sintering, the method has the advantages that the furnace burden granulation effect is improved, part of fuel is wrapped in iron-containing furnace burden, the ignition negative pressure and the sintering negative pressure are both low, and the ignition temperature is controlled to be high.
Furthermore, when the final mixture is used for sintering, the thickness of the material layer is controlled to be 850-1000mm, and compared with the prior art, the thickness of the material layer is larger, so that the self-heat storage capacity of the material layer can be effectively improved, and the sintering fuel consumption is reduced.
Detailed Description
The present invention will be further described with reference to the following examples.
The method for utilizing the superfine coal powder in sintering comprises the following steps:
step 1, screening the fuel before entering a fuel bin, and dividing the fuel into a first fuel with the particle size larger than 1mm and a second fuel with the particle size smaller than or equal to 1 mm.
And 2, carrying out primary mixing and secondary mixing on the first fuel, part of iron ore powder and other sintering raw materials to form a first mixed material. In the first mixture, the mass of the part of iron ore powder accounts for 55-90% of the total mass of the iron ore powder, and the mass content of the iron ore powder with the granularity of 0.5-3.0mm in the part of iron ore powder is not less than 70%. The carbon content of the sintering fuel is 2.6-4.3 percent calculated by the content of fixed carbon, wherein the carbon content of the second mixture is 0.35-0.55 percent calculated by the carbon-oxygen molar ratio
And 3, grinding the second fuel to enable the mass ratio of particles with the particle size of below 200 meshes in the second fuel to be 60% -80% of the mass ratio of the second fuel, mixing the ground second fuel with the rest iron ore powder, pelletizing by a disc pelletizer, and controlling the mass ratio of the pelletizing particles with the diameter of 1-3mm to be more than 90% to obtain the mixed material pellet.
And 4, further uniformly mixing the first mixture and the mixed material balls in a mixing barrel to obtain a final mixture.
And 5, distributing and sintering the final mixture, crushing and cooling the mixture, and screening the whole particles. The sintering ignition negative pressure is 5.5-6.9kpa, the ignition temperature is 1100 ℃ -1150 ℃, and the negative pressure in the sintering process is controlled to be 7.5-9.5 kpa. The thickness of the material layer is controlled to be 850-1000 mm.
The embodiment of the invention takes the sintering mixture of the steel plant as the experimental raw material to carry out the sintering experiment. The steel plant sinter mix formulation is shown in table 1. The following examples were all tested in the proportions shown in Table 1.
TABLE 1
| Components | Iron ore powder | Return ore | Quick lime | Limestone | Coke powder |
| Mass percentage content (%) | 59 | 22 | 3.7 | 10.5 | 4.8 |
Example 1
The method for utilizing the superfine coal powder in sintering comprises the following steps:
step 1, screening the fuel before entering a fuel bin, and dividing the fuel into a first fuel with the particle size larger than 1mm and a second fuel with the particle size smaller than or equal to 1 mm.
And 2, carrying out primary mixing and secondary mixing on the first fuel, part of iron ore powder and other sintering raw materials to form a first mixed material. In the first mixture, the mass of the part of iron ore powder accounts for 55% of the total mass of the iron ore powder, and the mass content of the iron ore powder with the granularity of 0.5-3.0mm in the part of iron ore powder is not less than 70%. The carbon content of the sintering fuel is 3 percent in terms of the fixed carbon content, wherein the carbon content of the second mixture is 0.35 percent in terms of the carbon-oxygen molar ratio
And 3, grinding the second fuel to enable the mass ratio of particles with the particle size of below 200 meshes in the second fuel to be 80% of that of the second fuel, mixing the ground second fuel with the rest iron ore powder, pelletizing by a disc pelletizer, and controlling the mass ratio of the pelletizing particles with the diameter of 1-3mm to be more than 90% to obtain the mixed material pellet.
And 4, further uniformly mixing the first mixture and the mixed material balls in a mixing barrel to obtain a final mixture.
And 5, distributing and sintering the final mixture, crushing and cooling the mixture, and screening the whole particles. The sintering ignition negative pressure is 5.5-6.9kpa, the ignition temperature is 1100 ℃, and the negative pressure in the sintering process is controlled to be 7.5-9.5 kpa. The thickness of the bed was controlled to 850.
The moisture content of the pellets, the vertical sintering speed in the sintering process, the finished product rate of the sintered ore, the drum index and the utilization coefficient of the sintering machine are detected and calculated, and the calculation results are shown in table 2.
Example 2
The method for utilizing the superfine coal powder in sintering comprises the following steps:
step 1, screening the fuel before entering a fuel bin, and dividing the fuel into a first fuel with the particle size larger than 1mm and a second fuel with the particle size smaller than or equal to 1 mm.
And 2, carrying out primary mixing and secondary mixing on the first fuel, part of iron ore powder and other sintering raw materials to form a first mixed material. In the first mixture, the mass of the part of iron ore powder accounts for 70% of the total mass of the iron ore powder, and the mass content of the iron ore powder with the granularity of 0.5-3.0mm in the part of iron ore powder is not less than 70%. The carbon content of the sintering fuel is 2.6 percent in terms of fixed carbon content, wherein the carbon content of the second mixture is 0.4 percent in terms of carbon-oxygen molar ratio
And 3, grinding the second fuel to enable the mass ratio of particles with the particle size of below 200 meshes in the second fuel to be 70% of that of the second fuel, mixing the ground second fuel with the residual iron ore powder, pelletizing by using a disc pelletizer, and controlling the mass ratio of the pelletizing particles with the diameter of 1-3mm to be more than 90% to obtain the mixed material pellet.
And 4, further uniformly mixing the first mixture and the mixed material balls in a mixing barrel to obtain a final mixture.
And 5, distributing and sintering the final mixture, crushing and cooling the mixture, and screening the whole particles. The sintering ignition negative pressure is 5.5-6.9kpa, the ignition temperature is 1150 ℃, and the negative pressure in the sintering process is controlled to be 7.5-9.5 kpa. The thickness of the material layer is controlled to be 1000 mm.
The moisture content of the pellets, the vertical sintering speed in the sintering process, the finished product rate of the sintered ore, the drum index and the utilization coefficient of the sintering machine are detected and calculated, and the calculation results are shown in table 2.
Example 3
The method for utilizing the superfine coal powder in sintering comprises the following steps:
step 1, screening the fuel before entering a fuel bin, and dividing the fuel into a first fuel with the particle size larger than 1mm and a second fuel with the particle size smaller than or equal to 1 mm.
And 2, carrying out primary mixing and secondary mixing on the first fuel, part of iron ore powder and other sintering raw materials to form a first mixed material. In the first mixture, the mass of the part of the iron ore powder accounts for 90% of the total mass of the iron ore powder, and the mass content of the iron ore powder with the granularity of 0.5-3.0mm in the part of the iron ore powder is not less than 70%. The carbon content of the sintering fuel is 4.3 percent in terms of fixed carbon content, wherein the carbon content of the second mixture is 0.55 percent in terms of carbon-oxygen molar ratio
And 3, grinding the second fuel to enable the mass ratio of particles with the particle size of below 200 meshes in the second fuel to be 60% of that of the second fuel, mixing the ground second fuel with the rest iron ore powder, pelletizing by a disc pelletizer, and controlling the mass ratio of the pelletizing particles with the diameter of 1-3mm to be more than 90% to obtain the mixed material pellet.
And 4, further uniformly mixing the first mixture and the mixed material balls in a mixing barrel to obtain a final mixture.
And 5, distributing and sintering the final mixture, crushing and cooling the mixture, and screening the whole particles. The sintering ignition negative pressure is 5.5-6.9kpa, the ignition temperature is 1130 ℃, and the negative pressure in the sintering process is controlled to be 7.5-9.5 kpa. The thickness of the material layer is controlled to be 950 mm.
The moisture content of the pellets, the vertical sintering speed in the sintering process, the finished product rate of the sintered ore, the drum index and the utilization coefficient of the sintering machine are detected and calculated, and the calculation results are shown in table 2.
In the comparative example, the raw material ratios are performed according to the ratios in table 1, under the same sintering conditions as those in example 1, the sintering method of screening, pelletizing and uniformly mixing the fuel provided by the present invention is compared with the sintering effect of the conventional method, the vertical sintering speed, yield and utilization coefficient of the sintering machine of the sintered ore are calculated, the drum index of the sintered ore is detected, and the statistical results are shown in table 2:
TABLE 2
As can be seen from Table 2, the sintered ore produced in examples 1 to 3 of the present invention has improved vertical sintering rate, yield, drum index and utilization factor of the sintering machine, and reduced fuel consumption per unit, as compared with the control group. The invention can obviously improve the quality of the sinter and expand the fuel selection range, thereby reducing the production cost.
In conclusion, the fuel is screened, and the obtained superfine fuel and the concentrate powder are subjected to pelletizing treatment, so that the superfine fuel can be well utilized, the problems of fuel permeability deterioration, fuel consumption increase and the like caused by direct application of superfine coal powder in sintering are solved, the quality of sintered ore is improved, and the environmental protection pressure of sintering production is reduced.
Compared with the prior art, the invention has the following beneficial effects: 1. the invention has simple sintering process, less change to the traditional sintering process and strong practicability; 2. the sintering process of the invention does not add other costs. 3. The invention can also improve the structure of the sintered fuel and expand the selection range of the fuel, thereby reducing the production cost.
Claims (9)
1. A method for utilizing superfine coal powder in sintering is characterized by comprising the following steps:
screening the sintered fuel to obtain a first fuel with the particle size of more than 1mm and a second fuel with the particle size of less than or equal to 1 mm;
carrying out primary mixing and secondary mixing on a first fuel, part of iron ore powder and other sintering raw materials to obtain a first mixture, wherein the part of iron ore powder is 55-90% of the iron ore powder by mass;
grinding the second fuel, wherein materials with the particle size of less than 200 meshes account for 60-80% of the mass of the second fuel in the ground second fuel, mixing the ground second fuel with the residual iron ore powder, and pelletizing to obtain mixed material pellets;
uniformly mixing the first mixture with the mixture balls to obtain a final mixture;
the final mix was used for sintering.
2. The method for utilizing superfine coal powder in sintering according to claim 1, wherein the fuel is one or a mixture of coke powder, semi-coke and anthracite.
3. The method for utilizing superfine coal powder in sintering according to claim 1, wherein the content of iron ore powder with the particle size of 0.5-3.0mm in the first mixture is not less than 70% of the total mass of the part of iron ore powder.
4. The method for utilizing the ultrafine coal powder in the sintering process according to claim 1, wherein the carbon blending ratio of the sintering fuel is 2.6-4.3% in terms of the fixed carbon content, and the carbon blending amount in the mixture pellet is 0.35-0.55% in terms of the carbon-oxygen molar ratio.
5. The method for utilizing ultrafine coal powder in sintering as claimed in claim 1, wherein the final mixture is used for sintering, and during the cloth sintering, the sintering ignition negative pressure is 5.5-6.9kPa, the ignition temperature is 1050-1150 ℃, and the sintering negative pressure is controlled to be 7.5-9.5 kPa.
6. The method for utilizing ultrafine coal powder in sintering according to claim 1, wherein the layer thickness is controlled to be 850-1000mm when the final mixture is used for sintering.
7. A sinter mix, comprising a first mix and mix pellets:
the mixed material balls are prepared by mixing and pelletizing a sintering fuel with the particle size of less than or equal to 1mm and a part of iron ore powder in the sintering mixture, wherein in the sintering fuel with the particle size of less than or equal to 1mm, the mass of materials below 200 meshes accounts for 60-80%;
the first mixture is obtained by primary mixing and secondary mixing of a solvent, a sintering fuel with the grain size larger than 1mm and the rest of iron ore powder in the sintering mixture;
wherein the mass of the iron ore powder in the mixture ball accounts for 55-90% of the mass of the iron ore powder in the sintering mixture.
8. A sinter mix as claimed in claim 7, wherein the solvent is quicklime and or limestone.
9. The sinter mix of claim 7, further comprising return fines.
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| CN114854983A (en) * | 2022-06-08 | 2022-08-05 | 中南大学 | Sintered carbon emission reduction method based on efficient fuel combustion in ultrahigh material bed sintering process |
| CN114934173A (en) * | 2022-05-24 | 2022-08-23 | 武钢集团昆明钢铁股份有限公司 | Reinforced sintering method for fuel fractional addition |
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