CN111549217A - Iron ore sintering method capable of simultaneously improving mechanical performance of sintering ore and reducing emission of nitrogen oxides - Google Patents
Iron ore sintering method capable of simultaneously improving mechanical performance of sintering ore and reducing emission of nitrogen oxides Download PDFInfo
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- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title claims abstract description 129
- 238000005245 sintering Methods 0.000 title claims abstract description 108
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 50
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 37
- 239000000463 material Substances 0.000 claims abstract description 66
- 239000000843 powder Substances 0.000 claims abstract description 25
- 239000012188 paraffin wax Substances 0.000 claims abstract description 23
- 230000008569 process Effects 0.000 claims description 20
- 239000000203 mixture Substances 0.000 claims description 16
- 239000002994 raw material Substances 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000004449 solid propellant Substances 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 238000012360 testing method Methods 0.000 abstract description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 7
- 239000003546 flue gas Substances 0.000 abstract description 7
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 14
- 229910000831 Steel Inorganic materials 0.000 description 13
- 239000010959 steel Substances 0.000 description 13
- 229910002089 NOx Inorganic materials 0.000 description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 9
- 239000010881 fly ash Substances 0.000 description 8
- 239000002893 slag Substances 0.000 description 8
- 238000005406 washing Methods 0.000 description 8
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 7
- 239000002956 ash Substances 0.000 description 7
- 235000012255 calcium oxide Nutrition 0.000 description 7
- 239000000292 calcium oxide Substances 0.000 description 7
- 239000010459 dolomite Substances 0.000 description 7
- 229910000514 dolomite Inorganic materials 0.000 description 7
- 239000011777 magnesium Substances 0.000 description 7
- 229910052749 magnesium Inorganic materials 0.000 description 7
- 239000004575 stone Substances 0.000 description 7
- 239000000446 fuel Substances 0.000 description 6
- 239000003915 liquefied petroleum gas Substances 0.000 description 6
- 230000009467 reduction Effects 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 239000000428 dust Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
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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
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/244—Binding; Briquetting ; Granulating with binders organic
-
- 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
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- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
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Abstract
The invention belongs to the technical field of iron ore sintering, and particularly relates to an iron ore sintering method capable of simultaneously improving the mechanical property of a sintering ore and reducing the emission of nitrogen oxides. The method comprises the steps of batching, primary mixing, secondary mixing, distributing, igniting and sintering, wherein paraffin is added in the secondary mixing step. The inventor finds that the mechanical property of the sinter can be improved and the emission of nitrogen oxides can be obviously reduced by adding a proper amount of paraffin into the secondary mixed material. Specifically, compared with a blank test, the drum index of the sinter can be improved by 1%, the powder smaller than 5mm is reduced by nearly 1%, and the mechanical property of the sinter is improved; meanwhile, compared with a blank test, the total concentration of nitric oxide and nitric oxide in the sintering flue gas is reduced.
Description
Technical Field
The invention belongs to the technical field of iron ore sintering, and particularly relates to an iron ore sintering method capable of simultaneously improving the mechanical property of a sintering ore and reducing the emission of nitrogen oxides.
Background
The sintered ore is the main raw material for blast furnace ironmaking, the drum index is an important index for measuring the quality of the sintered ore, the index is used for measuring the mechanical strength of the sintered ore and indicating the impact resistance and wear resistance of the sintered ore, the higher the drum index is, the better the strength of the sintered ore is, and the stronger the impact resistance and wear resistance is in the transportation process, so that the air permeability is good and the granularity is uniform when the sintered ore enters the blast furnace for smelting, thereby ensuring that the blast furnace obtains good smelting conditions, improving the utilization coefficient of the blast furnace and reducing the smelting cost.
The steel industry belongs to typical high energy consumption, high material consumption and high pollution industries and is one of main sources of air pollution, pollutants discharged by the steel industry account for 10% of the total discharge of the industry, wherein the sintering process is the process with the highest pollution load, the pollution load is as high as 39.04%, and the discharged waste gas accounts for 40% of the total discharge of all the processes.
The sintering process not only takes charge of providing raw materials for blast furnace production, but also has the function of absorbing various return materials, and is also a main process for discharging smoke pollutants, the discharge amount of NOx of the sintering process accounts for more than 50 percent of the discharge amount of the corresponding pollutants in the whole steel production process, and the NOx is accompanied with pollutants such as alkali heavy metals and the like. With the annual increase of the sinter production, the environmental problems caused by the sinter are increasingly highlighted.
In the prior art, in order to improve the benefits of the steel industry and reduce pollution, researches are generally carried out respectively aiming at the aspects of improving the mechanical property of sintered ore and reducing the emission of nitrogen oxides, the two aspects are not organically combined together, and if a method capable of improving the mechanical property of the sintered ore and reducing the emission of nitrogen oxides is provided, the method has important significance for promoting the development of the steel industry.
Disclosure of Invention
Therefore, the present invention is directed to overcoming the disadvantages of the prior art that the mechanical properties of the sintering ore can be simultaneously improved and the emission of nitrogen oxides can be reduced, and to providing an iron ore sintering method that can simultaneously improve the mechanical properties of the sintering ore and reduce the emission of nitrogen oxides.
Therefore, the invention provides the following technical scheme:
the invention provides an iron ore sintering method capable of simultaneously improving the mechanical performance of a sintering furnace and reducing the emission of nitrogen oxides.
Further, the addition amount of the paraffin accounts for 0.13-0.96% of the total mass of the sinter mix.
Further, the addition amount of the paraffin accounts for 0.15-0.48% of the total mass of the sinter mix.
Further, the paraffin wax is added after being pulverized.
Further, the solid fuel accounts for 4-6% of the sinter mix by mass of the total sinter mix.
Further, the solid fuel accounts for 4.23-4.44% of the sinter mix by mass.
Further, the ignition temperature of the ignition step is 1050-1250 ℃, and the ignition time is 90-120 s.
Further, the sintering pressure is 6 to 10 kPa.
Further, in the material distribution step, the thickness of the material layer is 500-800 mm.
Furthermore, in the iron ore sintering method capable of simultaneously improving the mechanical property of the sintering ore and reducing the emission of nitrogen oxides, other components of the sintering mixture are calculated by the conventional process, and no obvious difference exists. Specifically, the sintering mixture can also comprise the following raw materials in percentage by mass:
52-60% of iron ore powder;
10-14% of return fines;
6-8% of fusing agent;
7-9% of water.
Further, the sintering mixture can also comprise fine ore A, wherein the fine ore A is at least one of washing material, groove return material, magnesium stone powder, dedusting ash and steel slag. Wherein the washing material is purchased from the market; the return material comes from return ores under the blast furnace; the fly ash is derived from fly ash collected by dust removal equipment; the steel slag is purchased from the market.
In the invention, the flux is at least one of quicklime, limestone, dolomite and serpentine; the solid fuel is coke powder and/or coal.
In the invention, the operation of primary mixing and secondary mixing is not obviously different from the mixing in the sintering step of the conventional iron ore, and the difference is that paraffin is added into the secondary mixing.
The technical scheme of the invention has the following advantages:
1. the invention provides an iron ore sintering method capable of simultaneously improving mechanical properties of a sintering ore and reducing emission of nitrogen oxides. The inventor finds that the mechanical property of the sinter can be improved and the emission of nitrogen oxides can be obviously reduced by adding a proper amount of paraffin into the secondary mixed material. In particular, NO by examples and blank experimentsxThe data detected are NO and NOxThe highest concentration is 104mg/m respectively3,164mg/m3NO and NOxThe reduction is obvious and is 52.7 percent and 51.6 percent respectively. NO and NOxThe average concentration was 48.5mg/m3And 76.7mg/m3And respectively reduced by 57.8 percent and 56.8 percent. Therefore, the paraffin is added in the secondary mixing step, and the emission reduction effect of the nitrogen oxide is very obvious. Meanwhile, the physical and mechanical properties of the sinter are improved, and the main performance is shown in the rotating drum index and the granularity composition. And paraffin is added in the secondary mixing step, the drum index is improved from 69% to 70%, and the powder with the diameter smaller than 5mm is reduced from 16.07% to 15.13%, so that the mechanical property of the sinter is improved by adding the paraffin in the secondary mixing step.
The iron ore sintering method capable of simultaneously improving the mechanical property of the sintered ore and reducing the emission of nitrogen oxides provided by the invention can further improve the mechanical property of the sintered ore and reduce the content of nitrogen oxides in the iron ore sintering process by limiting the dosage of paraffin.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a graph showing the variation of the concentration of nitrogen oxides in a blank control experiment according to the present invention;
FIG. 2 is a graph showing the change in the concentration of nitrogen oxides in example 1 of the present invention.
Detailed Description
The following examples are provided to further understand the present invention, not to limit the scope of the present invention, but to provide the best mode, not to limit the content and the protection scope of the present invention, and any product similar or similar to the present invention, which is obtained by combining the present invention with other prior art features, falls within the protection scope of the present invention.
The examples do not show the specific experimental steps or conditions, and can be performed according to the conventional experimental steps described in the literature in the field. The reagents or instruments used are not indicated by manufacturers, and are all conventional reagent products which can be obtained commercially.
Example 1
The embodiment provides an iron ore sintering method capable of simultaneously improving the mechanical performance of a sintering ore and reducing the emission of nitrogen oxides, which comprises the following specific operation steps:
preparing materials: the quality proportioning method is to blend the raw materials according to a certain proportion.
Primary mixing: 42kg of iron ore powder, 2.5kg of washing material, 4.8kg of tank returning material, 1.6kg of magnesium stone powder, 0.28kg of dolomite powder, 0.7kg of dedusting ash and 1.22kg of steel slag are mixed by hand.
Secondary material mixing: 53.1kg of the primary mixed material is added with 8.4kg of return mine, 4.7kg of quicklime, 1.4kg of fly ash, 3.15kg of coke powder, 0.19kg of crushed paraffin and 5.6kg of water to be continuously mixed and granulated.
Material distribution: the sinter with the grain diameter of 10-16 mm is arranged on a grate bar of a sintering cup to be used as a bedding material, and the thickness is generally about 20 mm. The size of the sintering cup body is phi 300 multiplied by 1000mm, two mixed materials obtained by mixing and granulating are put into the sintering cup, and the thickness of the sintering material is 700 mm.
And (3) ignition: the fuel used for ignition is liquefied petroleum gas, the ignition temperature is 1150 +/-50 ℃, and the ignition time is 2 min.
And (3) sintering: after ignition is finished, the air quantity of the exhaust fan is 20% of the rated power of the Roots fan, and the negative pressure is generally 6-10 kPa. And after the sintering is finished, when the temperature of the vacuum chamber reaches the highest temperature and then is reduced by 100 ℃, the sintering process is finished.
Example 2
The embodiment provides an iron ore sintering method capable of simultaneously improving the mechanical performance of a sintering ore and reducing the emission of nitrogen oxides, which comprises the following specific operation steps:
preparing materials: the quality proportioning method is to mix the raw materials according to a certain proportion.
Primary mixing: 42kg of iron ore powder, 2.5kg of washing material, 4.8kg of tank returning material, 1.6kg of magnesium stone powder, 0.28kg of dolomite powder, 0.7kg of dedusting ash and 1.22kg of steel slag are mixed by hand.
Secondary material mixing: 53.1kg of the primary mixed material is added with 8.4kg of return ores, 4.7kg of quicklime, 1.4kg of fly ash, 3.1kg of coke powder, 0.28kg of crushed paraffin and 5.6kg of water for continuous mixing and granulation.
Material distribution: the sinter with the grain diameter of 10-16 mm is arranged on a grate bar of a sintering cup to be used as a bedding material, and the thickness is generally about 20 mm. The size of the sintering cup body is phi 300 multiplied by 1000mm, two mixed materials obtained by mixing and granulating are put into the sintering cup, and the thickness of the sintering material is 700 mm.
And (3) ignition: the fuel used for ignition is liquefied petroleum gas, the ignition temperature is 1150 +/-50 ℃, and the ignition time is 2 min.
And (3) sintering: after ignition is finished, the air quantity of the exhaust fan is 20% of the rated power of the Roots fan, and the negative pressure is generally 6-10 kPa. And after the sintering is finished, when the temperature of the vacuum chamber reaches the highest temperature and then is reduced by 100 ℃, the sintering process is finished.
Example 3
The embodiment provides an iron ore sintering method capable of simultaneously improving the mechanical performance of a sintering ore and reducing the emission of nitrogen oxides, which comprises the following specific operation steps:
preparing materials: the quality proportioning method is to blend the raw materials according to a certain proportion.
Primary mixing: 41kg of iron ore powder, 2.4kg of washing material, 5kg of tank returning material, 1.5kg of magnesium stone powder, 0.34kg of dolomite powder, 0.7kg of dedusting ash and 1.16kg of steel slag are mixed by hand.
Secondary material mixing: adding 52.1kg of the mixed material into 8.8kg of return ores, 5.3kg of quicklime, 1.4kg of fly ash, 3.08kg of coke powder, 0.25kg of crushed paraffin and 5.4kg of water, and continuously mixing and granulating.
Material distribution: the sinter with the grain diameter of 10-16 mm is arranged on a grate bar of a sintering cup to be used as a bedding material, and the thickness is generally about 20 mm. The size of the sintering cup body is phi 300 multiplied by 1000mm, two mixed materials obtained by mixing and granulating are put into the sintering cup, and the thickness of the sintering material is 700 mm.
And (3) ignition: the fuel used for ignition is liquefied petroleum gas, the ignition temperature is 1050 +/-50 ℃, and the ignition time is 2 min.
And (3) sintering: after ignition is finished, the air quantity of the exhaust fan is 20% of the rated power of the Roots fan, and the negative pressure is generally 6-10 kPa. And after the sintering is finished, when the temperature of the vacuum chamber reaches the highest temperature and then is reduced by 100 ℃, the sintering process is finished.
Example 4
The embodiment provides an iron ore sintering method capable of simultaneously improving the mechanical performance of a sintering ore and reducing the emission of nitrogen oxides, which comprises the following specific operation steps:
preparing materials: the quality proportioning method is to blend the raw materials according to a certain proportion.
Primary mixing: 43.4kg of iron ore powder, 3kg of washing material, 5.5kg of tank returning material, 1.6kg of magnesium stone powder, 0.4kg of dolomite powder, 0.7kg of dedusting ash and 1.3kg of steel slag are mixed by hand.
Secondary material mixing: adding 55.9kg of the mixed material into 9.8kg of return ores, 5.6kg of quicklime, 1.5kg of fly ash, 3.33kg of coke powder, 0.37kg of crushed paraffin and 6.3kg of water, and continuously mixing and granulating.
Material distribution: the sinter with the grain diameter of 10-16 mm is arranged on a grate bar of a sintering cup to be used as a bedding material, and the thickness is generally about 20 mm. The size of the sintering cup body is phi 300 x 1000mm, the two mixed materials obtained by mixing and granulating are put into the sintering cup, and the thickness of the sintering material is 700 mm.
And (3) ignition: the fuel used for ignition is liquefied petroleum gas, the ignition temperature is 1200 +/-50 ℃, and the ignition time is 2 min.
And (3) sintering: after ignition is finished, the air quantity of the exhaust fan is 20% of the rated power of the Roots fan, and the negative pressure is generally 6-10 kPa. And after the sintering is finished, when the temperature of the vacuum chamber reaches the highest temperature and then is reduced by 100 ℃, the sintering process is finished.
Example 5
The embodiment provides an iron ore sintering method capable of simultaneously improving the mechanical performance of a sintering ore and reducing the emission of nitrogen oxides, which comprises the following specific operation steps:
preparing materials: the quality proportioning method is to blend the raw materials according to a certain proportion.
Primary mixing: 40.6kg of iron ore powder, 2kg of washing material, 4.1kg of tank returning material, 1.6kg of magnesium stone powder, 0.2kg of dolomite powder, 0.7kg of dedusting ash and 1.10kg of steel slag are mixed by hand.
Secondary material mixing: adding 50.3kg of the mixed material into 7.1kg of return ores, 4.2kg of quicklime, 1.3kg of fly ash, 2.8kg of coke powder, 0.11kg of crushed paraffin and 5kg of water, and continuously mixing and granulating.
Material distribution: the sinter with the grain diameter of 10-16 mm is arranged on a grate bar of a sintering cup to be used as a bedding material, and the thickness is generally about 20 mm. The size of the sintering cup body is phi 300 x 1000mm, the two mixed materials obtained by mixing and granulating are put into the sintering cup, and the thickness of the sintering material is 700 mm.
And (3) ignition: the fuel used for ignition is liquefied petroleum gas, the ignition temperature is 1200 +/-50 ℃, and the ignition time is 2 min.
And (3) sintering: after ignition is finished, the air quantity of the exhaust fan is 20% of the rated power of the Roots fan, and the negative pressure is generally 6-10 kPa. And after the sintering is finished, when the temperature of the vacuum chamber reaches the highest temperature and then is reduced by 100 ℃, the sintering process is finished.
Comparative example 1
The comparative example provides an iron ore sintering method, comprising the following specific operation steps:
preparing materials: the quality proportioning method is to blend the raw materials according to a certain proportion.
Primary mixing: 42kg of iron ore powder, 2.5kg of washing material, 4.8kg of tank returning material, 1.6kg of magnesium stone powder, 0.28kg of dolomite powder, 0.7kg of dedusting ash and 1.22kg of steel slag are mixed by hand.
Secondary material mixing: 53.1kg of the primary mixed material is added with 8.4kg of return ores, 4.7kg of quicklime, 1.4kg of fly ash, 3.5kg of coke powder and 5.6kg of water to be continuously mixed and granulated.
Material distribution: sintering ore with the grain diameter of 10-16 mm is arranged on a grate bar of a sintering cup to be used as a bedding material, and the thickness is about 20 mm. The size of the sintering cup body is phi 300 multiplied by 1000mm, two mixed materials obtained by mixing and granulating are put into the sintering cup, and the thickness of the sintering material is 700 mm.
And (3) ignition: the fuel used for ignition is liquefied petroleum gas, the ignition temperature is 1100 +/-50 ℃, and the ignition time is 2 min.
And (3) sintering: after ignition is finished, the air quantity of the exhaust fan is 20% of the rated power of the Roots fan, and the negative pressure is generally 6-10 kPa. And after the sintering is finished, when the temperature of the vacuum chamber reaches the highest temperature and then is reduced by 100 ℃, the sintering process is finished.
Examples of the experiments
1. Testing of nitrogen oxides in sintering flue gas
The concentration of nitrogen oxides in the sintering flue gas is measured by a CHEMIST 600 portable flue gas analyzer produced by Seitron.
The total concentration of nitric oxide, nitrogen dioxide and nitrogen oxides in the sintering flue gas of comparative example 1 (blank) is shown in fig. 1; the concentration of nitrogen dioxide is 2mg/m3Floating up and down. Nitric oxide concentration is initially low and tends to riseAnd reached a peak around the 6 th minute and was maintained at 200mg/m3About, the maximum concentration of NO is 220mg/m3Gradually decreased at 18 minutes and decreased to 1mg/m at 30 minutes3At this point sintering is complete. NOxThe emission law is similar to that of NO, NOxThe highest concentration reaches 339mg/m3. It follows that nitrogen oxides during sintering are mainly derived from nitric oxide. Furthermore, the average NO concentration was about 114.8mg/m3,NOxThe average concentration was 177.7mg/m3. In the sintering flue gas in example 1, NO and NOxThe data for the detection are shown in FIG. 2, NO and NOxThe highest concentration is 104mg/m respectively3,164mg/m3NO and NOxThe reduction is obvious and is 52.7 percent and 51.6 percent respectively. NO and NOxThe average concentration was 48.5mg/m3And 76.7mg/m3And respectively reduced by 57.8 percent and 56.8 percent. Therefore, the emission reduction effect of the nitrogen oxides by adding the paraffin in the secondary mixing step is very obvious. Other embodiments can also obviously reduce the maximum concentration and the average concentration of nitric oxide and nitrogen oxide in the sintering flue gas, and the reduction level is equivalent to that of embodiment 1, and the details are not repeated.
2. Mechanical Property test of sintered Ore
After the sintering test is finished, the falling and drum strength tests are carried out according to the ISO-3271-2007 standard. The specific test results are shown in table 1.
TABLE 1
Test example | Drum index% | Particle size < 5 mm% |
Example 1 | 70.00 | 15.13 |
Example 2 | 69.88 | 15.35 |
Example 3 | 69.75 | 15.39 |
Example 4 | 69.57 | 15.37 |
Example 5 | 69.69 | 15.49 |
Comparative example 1 | 69.00 | 16.07 |
The data in the table show that after the method of replacing coke powder with paraffin is adopted, the drum index is improved to a certain extent, the granularity of the sintering ore is optimized, the powder proportion smaller than 5mm is reduced, the scheme with the best effect is that 10% of coke powder is replaced with paraffin, the drum index is improved by 1%, and the powder smaller than 5mm is reduced by 0.94%.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (10)
1. An iron ore sintering method capable of simultaneously improving mechanical performance of a sintering machine and reducing emission of nitrogen oxides comprises the steps of proportioning, primary mixing, secondary mixing, distributing, igniting and sintering, and is characterized in that paraffin is added in the secondary mixing step.
2. An iron ore sintering process capable of simultaneously improving mechanical properties of a sinter and reducing nitrogen oxide emissions as claimed in claim 1, wherein the paraffin wax is added in an amount of 0.13-0.96% by mass of the sinter mix.
3. An iron ore sintering process capable of simultaneously improving mechanical properties of a sinter and reducing nitrogen oxide emissions as claimed in claim 2, wherein the paraffin wax is added in an amount of 0.15-0.48% by mass of the sinter mix.
4. A method for iron ore sintering capable of simultaneously improving mechanical properties of a sintered ore and reducing nitrogen oxide emissions as claimed in any one of claims 1 to 3, wherein the paraffin wax is added after being crushed.
5. The iron ore sintering process capable of simultaneously improving mechanical properties of a sinter and reducing nitrogen oxide emissions as claimed in claim 4, wherein the solid fuel comprises 4-6% of the sinter mix by mass of the sinter mix.
6. The iron ore sintering process capable of simultaneously improving mechanical properties of a sinter and reducing nitrogen oxide emissions as claimed in claim 5, wherein the solid fuel comprises 4.23-4.44% of the sinter mix by mass of the sinter mix.
7. The iron ore sintering method capable of simultaneously improving mechanical properties of a sintered ore and reducing emission of nitrogen oxides as claimed in any one of claims 1 to 6, wherein the ignition temperature of the ignition step is 1050 ℃ and 1250 ℃, and the ignition time is 90 to 120 s.
8. The iron ore sintering process capable of simultaneously improving mechanical properties of a sintered ore and reducing nitrogen oxide emissions as claimed in claim 7, wherein the sintering pressure is 6-10 kPa.
9. The iron ore sintering method capable of simultaneously improving mechanical properties of a sintered ore and reducing emission of nitrogen oxides as claimed in claim 7, wherein the material layer thickness in the material distribution step is 500-800 mm.
10. The iron ore sintering method capable of simultaneously improving mechanical properties of a sintered ore and reducing emission of nitrogen oxides according to any one of claims 1 to 9, wherein the sintering mixture further comprises the following raw materials by mass:
52-60% of iron ore powder;
10-14% of return fines;
6-8% of fusing agent;
7-9% of water.
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FR1390551A (en) * | 1963-04-25 | 1965-02-26 | Euratom | Process for the production of pellets |
WO2003052149A1 (en) * | 2001-12-17 | 2003-06-26 | Samarco Mineração S/A. | Iron-ore pellets with reduced abrasion, sticking, degradation and dust emission, and a process for producing them |
JP2005154823A (en) * | 2003-11-25 | 2005-06-16 | Nippon Steel Corp | Granulation treatment method for sintering raw material in iron making |
JP2009280833A (en) * | 2008-05-19 | 2009-12-03 | Wakasawan Energ Kenkyu Center | Low-temperature iron-making method allowing high speed smelting |
CN109402384A (en) * | 2018-12-26 | 2019-03-01 | 中天钢铁集团有限公司 | A method of sintering reduces NOx |
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Publication number | Priority date | Publication date | Assignee | Title |
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FR1390551A (en) * | 1963-04-25 | 1965-02-26 | Euratom | Process for the production of pellets |
WO2003052149A1 (en) * | 2001-12-17 | 2003-06-26 | Samarco Mineração S/A. | Iron-ore pellets with reduced abrasion, sticking, degradation and dust emission, and a process for producing them |
JP2005154823A (en) * | 2003-11-25 | 2005-06-16 | Nippon Steel Corp | Granulation treatment method for sintering raw material in iron making |
JP2009280833A (en) * | 2008-05-19 | 2009-12-03 | Wakasawan Energ Kenkyu Center | Low-temperature iron-making method allowing high speed smelting |
CN109402384A (en) * | 2018-12-26 | 2019-03-01 | 中天钢铁集团有限公司 | A method of sintering reduces NOx |
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