CN113278793B - Layered ore blending method for pellet ore - Google Patents
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- CN113278793B CN113278793B CN202110421144.4A CN202110421144A CN113278793B CN 113278793 B CN113278793 B CN 113278793B CN 202110421144 A CN202110421144 A CN 202110421144A CN 113278793 B CN113278793 B CN 113278793B
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- 238000002156 mixing Methods 0.000 title claims abstract description 97
- 239000008188 pellet Substances 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 103
- 239000000843 powder Substances 0.000 claims abstract description 51
- 238000005453 pelletization Methods 0.000 claims abstract description 46
- 229910052595 hematite Inorganic materials 0.000 claims abstract description 28
- 239000011019 hematite Substances 0.000 claims abstract description 28
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 claims abstract description 28
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000007921 spray Substances 0.000 claims abstract description 25
- 238000009736 wetting Methods 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 42
- 229910000278 bentonite Inorganic materials 0.000 claims description 21
- 239000000440 bentonite Substances 0.000 claims description 21
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 21
- 239000002245 particle Substances 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 238000009853 pyrometallurgy Methods 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 235000019580 granularity Nutrition 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur 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
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- 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 a layered ore blending method for pellet ores, and belongs to the technical field of pyrometallurgy. Mixing 15% of hematite powder and 85% of magnetite powder to obtain a mixed material I; carrying out spray pelletizing on the pellets A; mixing 30% of hematite powder and 70% of magnetite powder to obtain a mixed material II; carrying out spray pelletizing on a pellet A obtained by wrapping the mixed wetting material with the obtained mixed material II to prepare a pellet B; mixing 45% of hematite powder and 55% of magnetite powder to obtain a mixed material III; carrying out spray pelletizing on the pellets B obtained by wrapping the mixed wetting material to prepare pellets C; mixing 60% of hematite powder and 40% of magnetite powder to obtain a mixed material IV; and (4) carrying out spray pelletizing on the pellets C obtained by wrapping the mixed wetting material to prepare pellets D. The pellet ore of the invention adopts a specific layered ore blending method, and overcomes the technical problem that the strength of the pellet after roasting is reduced due to uneven internal and external heating.
Description
Technical Field
The invention relates to a layered ore blending method for pellet ores, and belongs to the technical field of pyrometallurgy.
Background
The pellet is a method for preparing artificial block raw materials, and is a process for changing powdery materials into physical property phase chemical compositions which can meet the requirements of the next processing. In the pelletizing process, the material is rolled into balls and the particles are dense, so that physical properties such as density, porosity, shape, size phase mechanical strength and the like of the material are changed, more importantly, chemical and physicochemical properties such as chemical composition, reducibility, expansibility, high-temperature reduction softening property, low-temperature reduction softening property, fusibility and the like are generated, and the metallurgical performance of the material is improved.
Pellets are a more delicate production process than sinter, and some advantages of pellets are that sinter cannot be substituted. For example, pellets are mainly consolidated by mineral solid phase, unlike sintered ore, which is mainly bonded by liquid phase generated by sintering, so that less fuel is required for producing pellets; in addition, because the pellet production saves fuel, the produced carbon dioxide is little, and the pellet production is very favorable for reducing pollution and improving atmospheric environment. At present, the pellet is generally considered to have the following advantages at home and abroad;
1. the granularity is small and uniform, which is beneficial to improving the air permeability of the blast furnace charge column and uniformly distributing the gas.
2. High cold strength (compression and abrasion resistance) and less powder generation during transportation, handling and storage.
3. The iron has high taste, is beneficial to increasing the effective quality of the blast furnace material column, improving the product quality and reducing the coke ratio. 4. Good reducibility and is beneficial to improving the utilization of the chemical energy of the coal gas.
The blast furnace smelting has the following three main requirements on the quality of pellet ore: 1. the iron has high taste, and the content of harmful impurities such as sulfur, phosphorus and the like is low; 2. the mechanical strength is high at normal temperature; 3. excellent high-temperature metallurgical performance. In the prior art, the single mineral has the defects that the single grain is more and the connection is poor, so the strength is difficult to improve.
Disclosure of Invention
Aiming at the problems and the defects in the prior art, the invention provides a layered ore blending method for pellet ores. The pellet ore of the invention adopts a specific layered ore blending method, and overcomes the technical problem that the strength of the pellet after roasting is reduced due to uneven internal and external heating. The invention is realized by the following technical scheme.
A layered ore blending method for pellet ore comprises the following specific steps:
(1) firstly, mixing: mixing 15% of hematite powder of 200-300 meshes and 85% of magnetite powder to obtain a mixed material I;
(2) a mixed pelletizing: adding bentonite 1.5% and water 6% into the mixed material I obtained in the step (1) for mixing and wetting, and then adding water 3% into the mixed material I for spray pelletizing to prepare pellets A with the particle size of 4 +/-0.5 mm;
(3) mixing: mixing 30% of hematite powder with 200-300 meshes and 70% of magnetite powder to obtain a mixed material II;
(4) two-step mixing and pelletizing: adding the mixed material II obtained in the step (3) into mixed material II, namely 1.5% of bentonite and 6% of water for mixing and wetting, wrapping the mixed and wetted material on the pellets A obtained in the step (2), adding water of 3% of the mixed material II for spray pelletizing, and preparing pellets B with the particle size of 8 +/-0.5 mm;
(5) mixing: mixing 45% of hematite powder of 200-300 meshes and 55% of magnetite powder to obtain a mixed material III;
(6) three-mixing pelletizing: adding the mixed material III obtained in the step (5) into mixed material III 1.5% of bentonite and 6% of water for mixing and wetting, wrapping the mixed and wetted material with the pellets B obtained in the step (4), adding water of the mixed material III 3% for spray pelletizing, and preparing pellets C with the particle size of 12 +/-0.5 mm;
(7) and (4) mixing: mixing 60% of hematite powder of 200 meshes-300 meshes with 40% of magnetite powder to obtain a mixed material IV;
(8) four-mixing pelletizing: and (3) adding the mixed material IV obtained in the step (7) into mixed material IV 1.5% of bentonite and 6% of water for mixing and wetting, wrapping the pellets C obtained in the step (6) with the mixed and wetted material, and adding water of 3% of the mixed material IV for spray pelletizing to prepare pellets D with the particle size of 16 +/-0.5 mm.
The pellet D obtained in the step (8) is dried for 1-1.2h at the temperature of 300-.
Since roasting hematite at 1250 ℃ is an endothermic process, magnetite is an exothermic process. Therefore, the invention adopts a layered ore blending method, the inner layer is magnetite, the outer layer is hematite, and the inner layer and the outer layer can be uniformly heated, the thermal explosion rate is reduced, the pellet strength is higher, and the inner component and the outer component are more uniform after roasting through different layered ore blending.
The invention has the beneficial effects that:
(1) the pellet ore of the invention adopts the matching of minerals with different granularities, the grains of the prepared pellet ore are arranged and combined well, the grains can be mixed with each other and are connected end to end, and the whole structure is good.
(2) The pellet prepared by layered ore blending overcomes the technical problem of strength reduction of the roasted pellets caused by uneven internal and external heating, so that the prepared pellet has higher strength.
Drawings
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a diagram of a production apparatus of the present invention.
Detailed Description
The invention is further described with reference to the following drawings and detailed description.
Example 1
As shown in fig. 1 and 2, the layered ore blending method for pellet ore specifically comprises the following steps:
(1) firstly, mixing: mixing 15% of hematite powder of 200-300 meshes and 85% of magnetite powder to obtain a mixed material I;
(2) a mixed pelletizing: adding 1.5% of bentonite and 6% of water into the mixed material I obtained in the step (1), mixing and wetting, then adding 3% of water into the mixed material I, and performing spray pelletizing (a disc pelletizer with the diameter of 1m and the rotating speed of 300 r/min) to prepare pellets A with the diameter of 4 +/-0.5 mm;
(3) mixing: mixing 30% of hematite powder with 200-300 meshes and 70% of magnetite powder to obtain a mixed material II;
(4) two-step mixing and pelletizing: adding the mixed material II obtained in the step (3) into mixed material II 1.5% of bentonite and 6% of water for mixing and wetting, wrapping the mixed and wetted material on the pellet A obtained in the step (2), adding water of the mixed material II 3% for spray pelletizing (a disc pelletizer with the diameter of 1m and the rotating speed of 300 r/min), and preparing to obtain a pellet B with the diameter of 8 +/-0.5 mm;
(5) mixing: mixing 45% of hematite powder of 200-300 meshes and 55% of magnetite powder to obtain a mixed material III;
(6) three-mixing pelletizing: adding the mixed material III obtained in the step (5) into mixed material III 1.5% of bentonite and 6% of water for mixing and wetting, wrapping the mixed and wetted material with the pellets B obtained in the step (4), adding water of mixed material III 3% for spray pelletizing (a disc pelletizer with the diameter of 1m and the rotating speed of 300 r/min), and preparing pellets C with the diameter of 12 +/-0.5 mm;
(7) and (4) mixing: mixing 60% of hematite powder of 200 meshes-300 meshes with 40% of magnetite powder to obtain a mixed material IV;
(8) four-mixing pelletizing: and (3) adding the mixed material IV obtained in the step (7) into mixed material IV 1.5% of bentonite and 6% of water for mixing and wetting, wrapping the mixed and wetted material on the pellets C obtained in the step (6), adding water of the mixed material IV 3% for spray pelletizing (a disc pelletizer with the diameter of 1m and the rotating speed of 300 r/min), and preparing pellets D with the diameter of 16 +/-0.5 mm.
And (3) drying the pellets D obtained in the step (8) for 1h at 300 ℃ in a chain grate, preheating for 10min at 900 ℃ in the chain grate, roasting for 30min at 1250 ℃ in a rotary kiln, and cooling to obtain cooled pellets.
Comparative example 1
Adding 1.5 percent of bentonite and 6 percent of water into hematite powder for mixing and wetting, adding 3 percent of water into the hematite powder for spray pelletizing to prepare pellets with the size of 16 +/-0.5 mm, drying for 1h at 300 ℃ in a pellet grate, preheating for 10min at 900 ℃ in the grate, roasting for 30min at 1250 ℃ in a rotary kiln, and cooling to obtain the cooled pellets.
The cooled pellets of example 1 and comparative example 1 were measured for their compressive strength, and the results are shown in Table 1.
TABLE 1
| Experimental methods | Preheating temperature/. degree.C | Preheating time/min | Roasting temperature/. degree.C | Roasting time/min | Obtaining the compressive strength/(N/piece) |
| Example 1 | 900 | 10 | 1250 | 30 | 3670 |
| Comparative example 1 | 900 | 10 | 1250 | 30 | 3453 |
As can be seen from Table 1, the compression strength of the pellet ore prepared by layered ore blending is 217N higher than that of the directly and uniformly mixed finished product. Compared with direct mixing, the method is greatly improved.
Example 2
As shown in fig. 1 and 2, the layered ore blending method for pellet ore specifically comprises the following steps:
(1) firstly, mixing: mixing 15% of hematite powder of 200-300 meshes and 85% of magnetite powder to obtain a mixed material I;
(2) a mixed pelletizing: adding 1.5% of bentonite and 6% of water into the mixed material I obtained in the step (1), mixing and wetting, then adding 3% of water into the mixed material I, and performing spray pelletizing (a disc pelletizer with the diameter of 1m and the rotating speed of 300 r/min) to prepare pellets A with the diameter of 4 +/-0.5 mm;
(3) mixing: mixing 30% of hematite powder with 200-300 meshes and 70% of magnetite powder to obtain a mixed material II;
(4) two-step mixing and pelletizing: adding the mixed material II obtained in the step (3) into mixed material II 1.5% of bentonite and 6% of water for mixing and wetting, wrapping the mixed and wetted material on the pellet A obtained in the step (2), adding water of the mixed material II 3% for spray pelletizing (a disc pelletizer with the diameter of 1m and the rotating speed of 300 r/min), and preparing to obtain a pellet B with the diameter of 8 +/-0.5 mm;
(5) mixing: mixing 45% of hematite powder of 200-300 meshes and 55% of magnetite powder to obtain a mixed material III;
(6) three-mixing pelletizing: adding the mixed material III obtained in the step (5) into mixed material III 1.5% of bentonite and 6% of water for mixing and wetting, wrapping the mixed and wetted material with the pellets B obtained in the step (4), adding water of mixed material III 3% for spray pelletizing (a disc pelletizer with the diameter of 1m and the rotating speed of 300 r/min), and preparing pellets C with the diameter of 12 +/-0.5 mm;
(7) and (4) mixing: mixing 60% of hematite powder of 200 meshes-300 meshes with 40% of magnetite powder to obtain a mixed material IV;
(8) four-mixing pelletizing: and (3) adding the mixed material IV obtained in the step (7) into mixed material IV 1.5% of bentonite and 6% of water for mixing and wetting, wrapping the mixed and wetted material on the pellets C obtained in the step (6), adding water of the mixed material IV 3% for spray pelletizing (a disc pelletizer with the diameter of 1m and the rotating speed of 300 r/min), and preparing pellets D with the diameter of 16 +/-0.5 mm.
And (3) drying the pellets D obtained in the step (8) for 1.2h at 310 ℃ in a chain grate, preheating for 12min at 910 ℃ in the chain grate, roasting for 32min at 1260 ℃ in a rotary kiln, and cooling to obtain cooled pellets.
Example 3
As shown in fig. 1 and 2, the layered ore blending method for pellet ore specifically comprises the following steps:
(1) firstly, mixing: mixing 15% of hematite powder of 200-300 meshes and 85% of magnetite powder to obtain a mixed material I;
(2) a mixed pelletizing: adding 1.5% of bentonite and 6% of water into the mixed material I obtained in the step (1), mixing and wetting, then adding 3% of water into the mixed material I, and performing spray pelletizing (a disc pelletizer with the diameter of 1m and the rotating speed of 300 r/min) to prepare pellets A with the diameter of 4 +/-0.5 mm;
(3) mixing: mixing 30% of hematite powder with 200-300 meshes and 70% of magnetite powder to obtain a mixed material II;
(4) two-step mixing and pelletizing: adding the mixed material II obtained in the step (3) into mixed material II 1.5% of bentonite and 6% of water for mixing and wetting, wrapping the mixed and wetted material on the pellet A obtained in the step (2), adding water of the mixed material II 3% for spray pelletizing (a disc pelletizer with the diameter of 1m and the rotating speed of 300 r/min), and preparing to obtain a pellet B with the diameter of 8 +/-0.5 mm;
(5) mixing: mixing 45% of hematite powder of 200-300 meshes and 55% of magnetite powder to obtain a mixed material III;
(6) three-mixing pelletizing: adding the mixed material III obtained in the step (5) into mixed material III 1.5% of bentonite and 6% of water for mixing and wetting, wrapping the mixed and wetted material with the pellets B obtained in the step (4), adding water of mixed material III 3% for spray pelletizing (a disc pelletizer with the diameter of 1m and the rotating speed of 300 r/min), and preparing pellets C with the diameter of 12 +/-0.5 mm;
(7) and (4) mixing: mixing 60% of hematite powder of 200 meshes-300 meshes with 40% of magnetite powder to obtain a mixed material IV;
(8) four-mixing pelletizing: and (3) adding the mixed material IV obtained in the step (7) into mixed material IV 1.5% of bentonite and 6% of water for mixing and wetting, wrapping the mixed and wetted material on the pellets C obtained in the step (6), adding water of the mixed material IV 3% for spray pelletizing (a disc pelletizer with the diameter of 1m and the rotating speed of 300 r/min), and preparing pellets D with the diameter of 16 +/-0.5 mm.
And (3) drying the pellets D obtained in the step (8) for 1.1h at 305 ℃ in a chain grate, preheating for 11min at 905 ℃ in the chain grate, roasting for 31min at 1255 ℃ in a rotary kiln, and cooling to obtain cooled pellets.
While the present invention has been described in detail with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, and various changes can be made without departing from the spirit and scope of the present invention.
Claims (1)
1. A layered ore blending method for pellet ore is characterized in that: the method comprises the following specific steps:
(1) firstly, mixing: mixing 15% of hematite powder of 200-300 meshes and 85% of magnetite powder to obtain a mixed material I;
(2) a mixed pelletizing: adding bentonite 1.5% and water 6% into the mixed material I obtained in the step (1) for mixing and wetting, and then adding water 3% into the mixed material I for spray pelletizing to prepare pellets A with the particle size of 4 +/-0.5 mm;
(3) mixing: mixing 30% of hematite powder with 200-300 meshes and 70% of magnetite powder to obtain a mixed material II;
(4) two-step mixing and pelletizing: adding the mixed material II obtained in the step (3) into mixed material II, namely 1.5% of bentonite and 6% of water for mixing and wetting, wrapping the mixed and wetted material on the pellets A obtained in the step (2), adding water of 3% of the mixed material II for spray pelletizing, and preparing pellets B with the particle size of 8 +/-0.5 mm;
(5) mixing: mixing 45% of hematite powder of 200-300 meshes and 55% of magnetite powder to obtain a mixed material III;
(6) three-mixing pelletizing: adding the mixed material III obtained in the step (5) into mixed material III 1.5% of bentonite and 6% of water for mixing and wetting, wrapping the mixed and wetted material with the pellets B obtained in the step (4), adding water of the mixed material III 3% for spray pelletizing, and preparing pellets C with the particle size of 12 +/-0.5 mm;
(7) and (4) mixing: mixing 60% of hematite powder of 200 meshes-300 meshes with 40% of magnetite powder to obtain a mixed material IV;
(8) four-mixing pelletizing: adding the mixed material IV obtained in the step (7) into mixed material IV 1.5% of bentonite and 6% of water for mixing and wetting, wrapping the mixed and wetted material with the pellets C obtained in the step (6), adding water of the mixed material IV 3% for spray pelletizing, and preparing pellets D with the particle size of 16 +/-0.5 mm;
the pellet D obtained in the step (8) is dried for 1-1.2h at the temperature of 300-.
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