CN117025943A - Modified fuel for improving sintering technical index, preparation method and application - Google Patents
Modified fuel for improving sintering technical index, preparation method and application Download PDFInfo
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- CN117025943A CN117025943A CN202310819803.9A CN202310819803A CN117025943A CN 117025943 A CN117025943 A CN 117025943A CN 202310819803 A CN202310819803 A CN 202310819803A CN 117025943 A CN117025943 A CN 117025943A
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- sintering
- combustion agent
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- 239000000446 fuel Substances 0.000 title claims abstract description 153
- 238000005245 sintering Methods 0.000 title claims abstract description 53
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 238000002485 combustion reaction Methods 0.000 claims abstract description 39
- 239000002245 particle Substances 0.000 claims abstract description 38
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 32
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000000463 material Substances 0.000 claims abstract description 26
- 238000002156 mixing Methods 0.000 claims abstract description 22
- 239000004449 solid propellant Substances 0.000 claims abstract description 16
- 229910052742 iron Inorganic materials 0.000 claims abstract description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 12
- 239000002910 solid waste Substances 0.000 claims abstract description 12
- 238000012216 screening Methods 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 10
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000009826 distribution Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 9
- 230000004907 flux Effects 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 9
- 239000000292 calcium oxide Substances 0.000 claims description 7
- 235000012255 calcium oxide Nutrition 0.000 claims description 7
- 239000010881 fly ash Substances 0.000 claims description 4
- 238000004939 coking Methods 0.000 claims description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 2
- 239000011707 mineral Substances 0.000 claims description 2
- 235000010755 mineral Nutrition 0.000 claims description 2
- 239000002351 wastewater Substances 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims 1
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 230000014759 maintenance of location Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 15
- 230000008569 process Effects 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 10
- 239000000243 solution Substances 0.000 description 8
- 238000011049 filling Methods 0.000 description 5
- 239000000428 dust Substances 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000007873 sieving Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to the technical field of iron ore sintering, in particular to a modified fuel for improving sintering technical indexes, a preparation method and application. The specific steps of fuel preparation include: (1) Crushing the raw fuel, and screening to obtain the fuel with the particle size smaller than 1 mm; (2) Fully mixing the fuel with particle size less than 1mm, carbon-containing solid waste and a fuel slow-combustion agent to obtain modified fuel; the fuel slow-combustion agent comprises a solid fuel slow-combustion agent and/or a liquid fuel slow-combustion agent, wherein the mass ratio of the fuel slow-combustion agent in the modified fuel is 3% -10%. The fuel prepared by the invention is used for sintering iron ores, and after fine-fraction fuel is mixed with a slow-combustion agent, the combustion performance (ignition temperature rise and combustion time extension) of the fine-fraction fuel is improved, so that the high-temperature retention time of a sintered upper material layer is prolonged, the quality of the sintered upper material layer is improved, and the sintering return rate is reduced.
Description
Technical Field
The invention relates to the technical field of iron ore sintering, in particular to a modified fuel for improving sintering technical indexes, a preparation method and application.
Background
The fuel used in the iron ore sintering process is mainly solid fuel (coke powder and anthracite powder), and the fuel is slightly different in granularity requirement according to the different ore blending structure and production requirements, and is generally less than 3mm and accounts for 75% -85%. The fuel is generally crushed by a pair of rollers and four rollers to obtain qualified-granularity fuel, and the qualified-granularity fuel participates in the production of sintering ingredients. The long-term production data, investigation and standard comparison show that most of the crushed sintered fuel in the sintering plant has the phenomenon of overcrushing, the proportion of the particles smaller than 1mm is larger than 50%, the proportion of the particles smaller than 0.5mm is larger than 40%, and the stability of sintering production, the improvement of the quality index of the sintered ore and the reduction of energy consumption are extremely unfavorable. Meanwhile, in order to reduce the cost, the application of the carbon-containing dust in the sintering process is gradually normal, which further causes the proportion of the particles smaller than 1mm in the sintered fuel to be increased, further worsens the quality index of the upper sintered material layer, and the heat utilization rate of the fine-particle fuel is low.
In order to improve the quality index of sintered mineral products, the granularity segregation of the sintered mixture and the fuel is needed to be realized. After segregation distribution, the upper material layer fuel is mainly in fine particle size, and the large particle fuel is mostly positioned in the middle and lower material layers. Research shows that the fuel with the particle size smaller than 1mm has flash combustion under the high temperature and high oxidizing atmosphere of sintering ignition exhaust because of fine particle size and large specific surface area, the upper sintering high temperature holding time is short due to the too fast combustion speed, the liquid phase generation amount is small or the liquid phase condensation crystallization speed is fast, the strength of the part of sintered ore is reduced, and the return ore rate is increased.
Aiming at the problem that the ratio of the sintering fine fraction fuel is unfavorable for the improvement of economic and technical indexes, the Chinese patent CN111996367A in the prior art discloses a utilization method of superfine coal powder in sintering and a sintering mixture, superfine fuel is obtained through fuel screening, the superfine fuel is further finely ground to be below 200 meshes, then the superfine fuel is mixed with part of iron ore powder to prepare pellets with the diameter of 3-8mm, and the pellets are mixed with the rest of the sintering mixture and then sintered, so that the application of the superfine fuel in the early sintering process is realized. The method needs to be added with screening, fine grinding, pelletizing, weighing, other matched equipment and the like, and has relatively high investment and operation cost. The crushed sintered fuel is pre-screened, and the fraction smaller than 1mm is finely ground and then is used for blast furnace injection, but the crushed sintered fuel is influenced by coal dust performance, screening efficiency, transportation cost and the like and cannot be popularized and applied.
Disclosure of Invention
Aiming at the technical problem of insufficient combustion of the grade fuel with the particle size smaller than 1mm, the invention provides a modified fuel for improving sintering technical indexes, a preparation method and application.
In a first aspect, the present invention provides a method for preparing a modified fuel for improving sintering technical indexes, which specifically includes the steps of:
(1) Crushing the raw fuel, and screening to obtain the fuel with the particle size of <1mm and the fuel with the particle size of >1 mm;
(2) Fully mixing the fuel with particle size less than 1mm, carbon-containing solid waste and a fuel slow-combustion agent to obtain modified fuel; the fuel slow-combustion agent comprises a solid fuel slow-combustion agent and/or a liquid fuel slow-combustion agent, wherein the mass ratio of the fuel slow-combustion agent in the modified fuel is 3% -10%.
Further, the solid fuel slow-combustion agent is a fine-particle-grade powder material, and comprises any one or more of quicklime powder, dust and fine grinding powder.
Further, the liquid fuel slow-combustion agent is any one or more of coking wastewater, blast furnace slag flushing water, CMC solution and PVA solution.
Further, in the step (2), the <1mm particle size fuel, the carbon-containing solid waste, the solid fuel slow-combustion agent and the water are fully and uniformly mixed in a strong mixer, wherein the mass ratio of the water is 2% -8%; the addition of water can avoid dust generation during the stirring process of adding the solid fuel slow-combustion agent.
Further, in the step (2), the <1mm particle size fuel, the carbon-containing solid waste and the liquid fuel slow-combustion agent are fully and uniformly mixed in a strong mixer.
Further, the step (2) further comprises fully mixing the fly ash or the quicklime with the fuel with the particle size of less than 1mm, the carbon-containing solid waste and the fuel slow-burning agent.
In a second aspect, the present invention provides a modified fuel prepared by the above modified fuel preparation method.
In a third aspect, the present invention provides the use of the modified fuel described above in iron ore sintering.
Further, mixing and granulating the prepared modified fuel, the fuel with the particle size of more than 1mm, the flux, the mixed material and the return ore to obtain a sintered mixture, and then carrying out material distribution, ignition, sintering, crushing, cooling and particle finishing to obtain a finished product of sintered ore and return ore; the modified fuel is paved on the upper layer during the distribution.
The invention has the beneficial effects that:
1. after the fine-fraction fuel is mixed with the slow-combustion agent, the combustion performance (ignition temperature rise and combustion time extension) of the fuel is improved, so that the high-temperature holding time of sintering an upper material layer is prolonged, the quality of sintering ore of the upper material layer is improved, and the sintering return rate is reduced;
2. the fuel heat utilization rate of the particle size fraction of <1mm is improved, and the sintering solid fuel consumption is facilitated;
3. the common solid materials or liquid materials in the steel plant are used as the fuel slow-combustion agent, which is beneficial to reducing gas pollutants (NO x ) Is discharged from the reactor;
4. has higher economic benefit and social benefit; improving the economic and technical indexes of sintering.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a flow chart of the modified fuel of example 1 of the present invention with the addition of a solid fuel retarder for the sintering process.
FIG. 2 is a flow chart of the modified fuel of example 2 of the present invention with the addition of a liquid fuel retarder for the sintering process.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Example 1
A modified fuel added with a solid fuel slow-combustion agent is used for an iron ore sintering process, and comprises the following specific steps:
(1) Crushing the raw fuel, screening to obtain <1mm particle size fuel and >1mm particle size fuel, and independently filling the raw fuel into a bin for later use;
(2) Uniformly mixing the fuel with the particle size of less than 1mm, the quicklime, the carbon-containing solid waste and water in a strong mixer to obtain modified fuel, wherein the mass ratio of the quicklime in the modified fuel is 5%;
(3) And (3) uniformly mixing the modified fuel, the fuel with the particle size of more than 1mm, the flux, the mixed material and the return ore, granulating, and then carrying out material distribution, ignition, sintering, crushing, cooling and granulating to obtain the finished product sintered ore and the return ore.
Example 2
A modified fuel added with a liquid fuel slow-combustion agent is used for an iron ore sintering process, and comprises the following specific steps:
(1) Crushing the raw fuel, screening to obtain <1mm particle size fuel and >1mm particle size fuel, and independently filling the raw fuel into a bin for later use;
(2) Uniformly mixing the <1mm particle size fuel with blast furnace slag flushing water and carbon-containing solid waste in a strong mixer to obtain modified fuel, wherein the mass ratio of the blast furnace slag flushing water in the modified fuel is 6%;
(3) And (3) uniformly mixing the modified fuel, the fuel with the particle size of more than 1mm, the flux, the mixed material and the return ore, granulating, and then carrying out material distribution, ignition, sintering, crushing, cooling and granulating to obtain the finished product sintered ore and the return ore.
Example 3
A modified fuel added with a solid fuel slow-combustion agent is used for an iron ore sintering process, and comprises the following specific steps:
(1) Crushing the raw fuel, screening to obtain <1mm particle size fuel and >1mm particle size fuel, and independently filling the raw fuel into a bin for later use;
(2) Uniformly mixing the <1mm grade fuel with the fly ash, water and carbon-containing solid waste in a mixer to obtain modified fuel, wherein the mass ratio of the fly ash in the modified fuel is 3%, and the mass ratio of the water in the modified fuel is 5%;
(3) And (3) uniformly mixing the modified fuel, the fuel with the particle size of more than 1mm, the flux, the mixed material and the return ore, granulating, and then carrying out material distribution, ignition, sintering, crushing, cooling and granulating to obtain the finished product sintered ore and the return ore.
Example 4
A modified fuel added with a liquid fuel slow-combustion agent is used for an iron ore sintering process, and comprises the following specific steps:
(1) Crushing the raw fuel, screening to obtain <1mm particle size fuel and >1mm particle size fuel, and independently filling the raw fuel into a bin for later use;
(2) Uniformly mixing the <1mm particle size fuel and PVA solution containing carbon solid waste and having the mass fraction of 0.5% in a mixer to obtain modified fuel, wherein the PVA solution has an agglomeration effect, so that the consumption of the solid fuel can be reduced, and the mass ratio of the PVA solution in the modified fuel is 6%;
(3) And (3) uniformly mixing the modified fuel, the fuel with the particle size of more than 1mm, the flux, the mixed material and the return ore, granulating, and then carrying out material distribution, ignition, sintering, crushing, cooling and granulating to obtain the finished product sintered ore and the return ore.
Comparative example 1
The crushed fuel directly participates in sintering ingredients, and finished sinter and return ore are obtained through mixing granulation, material distribution, ignition, sintering, crushing, cooling and finishing.
Comparative example 2
The application of the fuel in the iron ore sintering process comprises the following specific steps:
directly adding quicklime with the mass ratio of 5% after crushing the raw materials without sieving, uniformly mixing with flux, uniformly mixing materials and return ores, granulating, and then carrying out material distribution, ignition, sintering, crushing, cooling and granulating to obtain finished sintered ores and return ores.
Comparative example 3
The application of the fuel in the iron ore sintering process comprises the following specific steps:
(1) Crushing the raw fuel, screening to obtain <1mm particle size fuel and >1mm particle size fuel, and independently filling the raw fuel into a bin for later use;
(2) Mixing the <1mm grade fuel, flux, return ore and quicklime with the mass ratio of 5%, uniformly mixing the mixture with the >1mm grade fuel and sintering mixture, granulating, and then carrying out material distribution, ignition, sintering, crushing, cooling and granulating to obtain the finished product of the sintered ore and the return ore.
The sintering key economic and technical indexes of examples 1-4 and comparative examples 1-3 were measured, and the results are shown in Table 1.
TABLE 1 sintering key economic and technical index
| Project | Solid fuel consumption/(kg/t) | Yield/% | NO x /(mg/m 3 ) |
| Example 1 | 54.24 | 78.25 | 22.29 |
| Example 2 | 54.23 | 78.26 | 22.05 |
| Example 3 | 54.42 | 78.39 | 22.59 |
| Example 4 | 54.12 | 78.72 | 22.36 |
| Comparative example 1 | 56.52 | 76.96 | 26.64 |
| Comparative example 2 | 55.26 | 77.85 | 25.06 |
| Comparative example 3 | 55.35 | 77.68 | 25.23 |
As can be seen from the analysis of examples 1-4 and comparative examples 1-3, the fuel was purified by sieving,<The 1 mm-size fuel is added with the fuel slow-combustion agent to be modified and then is mixed, so that the reduction of solid fuel consumption and the improvement of sinter yield can be realized, and meanwhile, NO x Different degrees of reduction in emission concentration; as can be seen from comparative examples 1 and 2, the sintered fuel is directly added with the fuel slow-combustion agent for modification treatment without sieving, and the effect is not obvious although the solid consumption and the yield index of the sintered ore are improved; comparative example 3 first<Slow combustion of 1mm size grade fuel and flux, return mine and fuelMixing the above materials, and mixing with>Mixing and granulating the 1mm size fuel and other mixtures also affects the economic and technical index of iron ore sintering.
Although the present invention has been described in detail by way of preferred embodiments with reference to the accompanying drawings, the present invention is not limited thereto. Various equivalent modifications and substitutions may be made in the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and it is intended that all such modifications and substitutions be within the scope of the present invention/be within the scope of the present invention as defined by the appended claims.
Claims (8)
1. The preparation method of the modified fuel for improving the sintering technical index is characterized by comprising the following specific steps of:
(1) Crushing the raw fuel, and screening to obtain the fuel with the particle size of <1mm and the fuel with the particle size of >1 mm;
(2) Fully mixing the fuel with particle size less than 1mm, carbon-containing solid waste and a fuel slow-combustion agent to obtain modified fuel; the fuel slow-combustion agent comprises a solid fuel slow-combustion agent and/or a liquid fuel slow-combustion agent, wherein the mass ratio of the fuel slow-combustion agent in the modified fuel is 3% -10%.
2. The method for producing modified fuel according to claim 1, wherein the solid fuel slow-combustion agent is a fine-grained powder material comprising any one or more of quicklime powder, fly ash, and fine-ground mineral powder.
3. The method for producing modified fuel according to claim 1, wherein the liquid fuel slow-combustion agent is any one or more of coking wastewater, blast furnace slag-washing water, CMC solution, and PVA solution.
4. The method for producing modified fuel according to claim 1, wherein step (2) is to mix <1mm size fraction fuel, carbon-containing solid waste, solid fuel retarder and water in a strong mixer sufficiently, the mass ratio of water being 2% -8%.
5. The method for producing a modified fuel according to claim 1, wherein the step (2) is to mix the <1mm size fraction fuel, the carbonaceous solid waste and the liquid fuel retarder sufficiently in a intensive mixer.
6. A modified fuel produced by the modified fuel production method of any one of claims 1 to 5.
7. Use of the modified fuel according to claim 6 in iron ore sintering.
8. The use of the modified fuel according to claim 7 in iron ore sintering, wherein the prepared modified fuel, fuel with the particle size of >1mm, flux, blending material and return ore are mixed and granulated to obtain a sintered mixture, and the sintered mixture is subjected to material distribution, ignition, air draft sintering, crushing, cooling and granulating to obtain finished sintered ore and return ore.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310819803.9A CN117025943A (en) | 2023-07-05 | 2023-07-05 | Modified fuel for improving sintering technical index, preparation method and application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310819803.9A CN117025943A (en) | 2023-07-05 | 2023-07-05 | Modified fuel for improving sintering technical index, preparation method and application |
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| Publication Number | Publication Date |
|---|---|
| CN117025943A true CN117025943A (en) | 2023-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310819803.9A Pending CN117025943A (en) | 2023-07-05 | 2023-07-05 | Modified fuel for improving sintering technical index, preparation method and application |
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| Country | Link |
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| CN (1) | CN117025943A (en) |
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- 2023-07-05 CN CN202310819803.9A patent/CN117025943A/en active Pending
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