CN113528808A - Sintered ore based on high-crystal-water limonite and magnetic separation tailings and production method thereof - Google Patents
Sintered ore based on high-crystal-water limonite and magnetic separation tailings and production method thereof Download PDFInfo
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- CN113528808A CN113528808A CN202110567980.3A CN202110567980A CN113528808A CN 113528808 A CN113528808 A CN 113528808A CN 202110567980 A CN202110567980 A CN 202110567980A CN 113528808 A CN113528808 A CN 113528808A
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- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 238000007885 magnetic separation Methods 0.000 title claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 32
- 238000005245 sintering Methods 0.000 claims abstract description 80
- 238000002156 mixing Methods 0.000 claims abstract description 53
- 239000000463 material Substances 0.000 claims abstract description 46
- 239000013078 crystal Substances 0.000 claims abstract description 27
- 239000012141 concentrate Substances 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 19
- 239000002245 particle Substances 0.000 claims abstract description 17
- 238000005453 pelletization Methods 0.000 claims abstract description 15
- 239000000853 adhesive Substances 0.000 claims abstract description 10
- 230000001070 adhesive effect Effects 0.000 claims abstract description 10
- 239000000843 powder Substances 0.000 claims abstract description 8
- 239000007791 liquid phase Substances 0.000 claims abstract description 6
- 230000003111 delayed effect Effects 0.000 claims abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 21
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 16
- 235000019738 Limestone Nutrition 0.000 claims description 8
- 239000000292 calcium oxide Substances 0.000 claims description 8
- 235000012255 calcium oxide Nutrition 0.000 claims description 8
- 239000010459 dolomite Substances 0.000 claims description 8
- 229910000514 dolomite Inorganic materials 0.000 claims description 8
- 239000006028 limestone Substances 0.000 claims description 8
- 238000002360 preparation method Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 235000010755 mineral Nutrition 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000009770 conventional sintering Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
Classifications
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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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/008—Composition or distribution of the charge
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a sintered ore based on high crystal water limonite and magnetic separation tailings and a production method thereof, wherein the method comprises the following steps: during ore blending, fine-grained concentrate is used as adhesive powder and is adhered to the surface of limonite during sintering and pelletizing, so that the low assimilation temperature of the limonite is delayed, the liquid phase flow is good, and the generation of thin-walled macropores of sintered ores is reduced; the proportion of the magnetic separation tailings in a particle size of 200 meshes is improved, the particle size is reduced, the assimilation temperature of the magnetic separation tailings is reduced, the magnetic separation tailings are used as adhesive materials to be wrapped on the surface of limonite, and sintered ore is finally obtained through sintering. Based on the method, the finally obtained sinter ore quality is greatly improved compared with the prior sinter ore quality, the drum index of the sinter ore is improved to more than 80 percent compared with the prior 78.5 percent, and the effect is obvious.
Description
Technical Field
The invention belongs to the field of sintered ores, and particularly relates to a sintered ore based on high crystal water limonite and magnetic separation tailings and a production method thereof.
Background
With the rising of the common index of international iron ore, the price of imported ore continuously rises, which brings difficulty to the cost reduction and benefit creation of iron and steel enterprises. In order to reduce the production cost, the red steel aims at the low-price limonite and magnetic separation tailings as production raw materials in the aspect of sintering used ores.
The currently used limonite has high crystal water content, high burning loss and lower temperature of gasification, and the ore is easy to shrink to form sintered ore with thin wall and large pores in the sintering process, and the mass addition can negatively influence the sintering product quality; the magnetic separation tailings are mainly a large amount of iron-containing tailings generated in the production process of tin plants, aluminum plants and copper plants in the peripheral region of the red river, but the part of resources belong to typical 'mature ores', the sintering performance is extremely poor, the content of harmful elements is high, if the tailings can be used together with limonite, the wastes can be changed into valuables, and the ore use cost of enterprises can be further reduced.
Disclosure of Invention
In order to solve the technical problems, high-crystal-water limonite is used for sintering, a certain amount of magnetic separation tailings are added, the negative influence on sintering caused by the limonite and the magnetic separation tailings is overcome, various technical and economic indexes of sintering are improved, sintering consumption is low, and the production of high-quality sintered ore is an important subject facing red steel at present.
In order to overcome the defects of the prior art, the invention provides a sintered ore based on high crystal water limonite and magnetic separation tailings and a production method thereof, and the method for producing the sintered ore by using the high crystal water limonite and the magnetic separation tailings is improved from the aspects of optimizing material using structures, improving the uniformly mixing efficiency of sintered materials, improving material temperature, optimizing sintering process parameters and the like, so that the drum strength of the sintered ore is improved, and the consumption is reduced.
Because the high crystal water limonite has high burning loss and lower assimilation temperature, the ore is easy to shrink to form a sintered ore with thin walls and large pores in the sintering process, and the strength of the sintered ore is adversely affected; the magnetic separation tailings have the problems of poor assimilation performance, difficult balling and difficult bonding.
In order to solve the problems, the invention adopts the following technical scheme:
a method for producing sintered ore based on high-crystal-water limonite and magnetic separation tailings comprises the following steps:
during ore blending, fine-grained concentrate is used as adhesive powder and is adhered to the surface of limonite during sintering and pelletizing, so that the low assimilation temperature of the limonite is delayed, the liquid phase flow is good, and the generation of thin-walled macropores of sintered ores is reduced;
the proportion of the magnetic separation tailings in a particle size of 200 meshes is improved, the particle size is reduced, the assimilation temperature of the magnetic separation tailings is reduced, the magnetic separation tailings are used as adhesive materials to be wrapped on the surface of limonite, and sintered ore is finally obtained through sintering.
A method for producing sintered ore based on high-crystal-water limonite and magnetic separation tailings comprises the following steps:
step (1) optimizing ore blending
When high crystal water limonite is used, a certain proportion of fine-grained concentrate is added to obtain a uniformly mixed ore; the uniformly mixed ore comprises the following materials in percentage by mass:
40-70% of high crystal water limonite, not less than 15% of fine-fraction concentrate, 3-8% of magnetic separation tailings and the balance of blast furnace return ores, wherein the total amount is 100%;
step (2) preparation for sintering
Preparing the following materials in percentage by mass:
4-6% of quicklime, 5-7% of dolomite, 3-5% of limestone, 73-77% of blending ore and the balance of coke powder, wherein the total amount is 100%;
step (3) sinter production
Controlling the sintering water content to be 8% -10%, mixing, pelletizing and granulating, wherein the first mixing time is 4-7 min, and the second mixing time is 4-6 min; the ignition temperature is controlled at 1050 ℃ and 1100 ℃, and the ignition time is controlled at 2.5-3 min; the thick material layer is adopted for sintering, and the material pressing operation is carried out on the sintering material surface, so that the material surface shrinkage is reduced, the density of the sintering ore is improved, and the sintering ore is finally obtained.
Furthermore, in the step (1), the proportion of the-200-mesh particle size in the magnetic separation tailings is more than 85%.
Furthermore, in the step (2), the ratio of the coke powder with the granularity less than 3mm is (75 +/-2)%, and the ratio of the coke powder with the granularity less than 1mm is less than or equal to 40%.
Further, in the step (3), the speed of the sintering machine is controlled to be 0.95-1.45m/min, so that the speed of the sintering machine is ensured to be uniform and continuous.
Further, in the step (3), the base number of the basicity of the sintered ore is 2.05-2.5 times; the MgO content in the sintered ore is controlled to be 2.6-3.1%.
The invention also relates to a sintered ore based on high crystal water limonite and magnetic separation tailings, which is prepared from the following components in percentage by mass:
4-6% of quicklime, 5-7% of dolomite, 3-5% of limestone, 73-77% of blending ore and the balance of coke powder, wherein the total amount is 100%;
the uniformly mixed ore comprises the following materials in percentage by mass:
40-60% of high crystal water limonite, not less than 15% of fine-fraction concentrate, 3-8% of magnetic separation tailings and the balance of blast furnace return ores, wherein the total amount is 100%.
The invention also relates to the sintered ore obtained by the production method.
In the invention:
1. optimizing ore blending, improving sintering performance of the blended ore, blending a certain proportion of fine fraction concentrate when high crystal water limonite is used, wherein the use proportion of the high crystal water limonite is 40-60%, and the proportion of the fine fraction concentrate is not lower than 15%.
The melting temperature of fine-fraction concentrate is higher, the melting temperature of limonite is lower, the fine-fraction concentrate is adhered to the surface of the limonite during sintering and pelletizing to form a hard shell, and the accelerated flow of a limonite liquid phase which is easy to assimilate in the sintering process is delayed.
2. The grain size of the magnetic separation tailings with the granularity of-200 meshes is increased from 70 percent to more than 85 percent; the use ratio of the magnetic separation tailings is 3% -8%.
Because the granularity of the magnetic separation tailings with the granularity of-200 mm accounts for about 70 percent, most of the tailings can not be used as spherical cores or adhesive powder, so that the balling property is reduced; by increasing the proportion of-200 mm particle size to more than 85%, most of the powder becomes fine-grained adhesive powder, so that the balling property of sintering balling is improved, and the powder can also be used as a 'hard shell'.
3. Adding a certain proportion of coke powder, wherein the proportion of the particle size of less than 3mm in the coke powder is controlled within the range of (75 +/-2)% and the proportion of the particle size of less than 1mm in the particle size of less than 3mm in the coke powder is less than or equal to 40%.
The proportion of the particle size of the coke powder smaller than 3mm is controlled within (75 +/-2)% mainly for controlling the oversize particle size of the coke powder, so that fuel segregation is easily caused, and meanwhile, the controlled too fine particle size of the coke powder causes short high-temperature retention time; wherein, the proportion of the coke powder with the granularity less than 3mm to the granularity less than 1mm is less than or equal to 40 percent, which mainly controls the granularity of the fuel to be too fine, and is easy to generate 'flash combustion', thus leading to insufficient heat.
4. And controlling the sintering water content to be 8-10%, mixing, pelletizing and granulating, wherein the mixing method adopts secondary mixing, the first mixing time is 4-7 min, and the second mixing time is 4-6 min.
Because limonite is easy to absorb water, sintering moisture must be increased to ensure good pelletizing.
5. The material distribution operation adopts thick material layer sintering, and material pressing operation is carried out on the sintering material surface, so that material surface shrinkage is reduced, and the density of the sintering ore is improved.
6. Because the limonite assimilation temperature is low and the sintered charge surface is over-melted due to too high temperature, the ignition temperature is controlled within the range of 1050-1100 ℃, and the ignition time is controlled within 2.5-3 min.
7. The machine speed of the sintering machine is controlled to be 0.95-1.45m/min, so that the sintering machine is ensured to have uniform and continuous speed, and the quality of the sintered ore is stabilized.
8. The base number of the basicity of the sintered ore is in the range of 2.05-2.5; the MgO content is in the range of 2.6-3.1%.
During ore blending, a certain proportion of fine-fraction concentrate is used, the fine-fraction concentrate has higher assimilation temperature and can be used as adhesive powder, the fine-fraction concentrate is adhered to the surface of limonite during sintering and pelletizing, the assimilation temperature of the limonite is delayed to be low, liquid phase flow is good, and therefore the generation of thin-wall macropores of a sintered ore is reduced; the magnetic separation tailings are poor in assimilation performance, the particle size is reduced by improving the proportion of the magnetic separation tailings to 200 meshes, so that the assimilation temperature of the magnetic separation tailings is reduced, and meanwhile, the magnetic separation tailings can be used as an adhesive to be wrapped on the surface of limonite, so that the quality of sinter is improved.
Compared with the prior art, the invention has the following beneficial effects:
the invention improves the aspects of optimizing the material structure, improving the uniformly mixing efficiency of the sintering material, improving the material temperature, optimizing the sintering process parameters and the like, thereby improving the drum strength of the sintering ore and reducing the consumption. The magnetic separation tailings have the problems of poor assimilation performance, difficult balling and difficult bonding. After the method is adopted, the sinter mineral content is greatly improved compared with the prior art, the sinter tumbler index is improved to more than 80 percent compared with the prior 78.5 percent, and the effect is obvious.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The examples do not specify particular techniques or conditions, and are performed according to the techniques or conditions described in the literature in the art or according to the product specifications. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available by purchase.
Example 1
The method for producing the sintered ore based on the high-crystal-water limonite and the magnetic separation tailings comprises the following steps:
step (1) optimizing ore blending
When high crystal water limonite is used, a certain proportion of fine-grained concentrate is added to obtain a uniformly mixed ore; the blended ore comprises the following materials in mass fraction as shown in table 1:
TABLE 1 blending ratio of ore
| Limonite | Fine fraction concentrate | Magnetic separationTailings | Return ores for blast furnace | Total up to |
| 65 | 17 | 4 | 14 | 100 |
The stacking parameters are shown in table 2:
TABLE 2 blending Ore Stacking parameters
| Item | Build volume (t) | Number of piled layers (layers) | Make heap flow (t/h) |
| Pile forming parameters | 70000 | 240 | 600 |
Step (2) preparation for sintering
The sintering recipe is shown in table 3:
TABLE 3 sintering ratio
| Item | Mixing ore | Coke powder | Dolomite | Limestone | Quick lime |
| Proportioning | 75.6 | 6.1 | 6.5 | 7.3 | 4.5 |
Step (3) sinter production
Controlling the sintering water content to be 9.5%, mixing, pelletizing and granulating, wherein the first mixing time is 5.0min, and the second mixing time is 5.5 min; controlling the ignition temperature to be about 1050 ℃ and the ignition time to be 3 min; the thick material layer is adopted for sintering, and the material pressing operation is carried out on the sintering material surface, so that the material surface shrinkage is reduced, the density of the sintering ore is improved, and the sintering ore is finally obtained.
The agglomerate quality is shown in table 4:
TABLE 4 quality index of sinter
| Item | Tumbler index | Proportion of < 10mm |
| Index (I) | 80.53 | 19.86 |
Example 2
The method for producing the sintered ore based on the high-crystal-water limonite and the magnetic separation tailings comprises the following steps:
step (1) optimizing ore blending
When high crystal water limonite is used, a certain proportion of fine-grained concentrate is added to obtain a uniformly mixed ore; the blended ore comprises the following materials in mass fraction as shown in table 1:
TABLE 1 blending ratio of ore
| Limonite | Fine fraction concentrate | Magnetic separation tailings | Return ores for blast furnace | Total up to |
| 55 | 25 | 6 | 14 | 100 |
The stacking parameters are shown in table 2:
TABLE 2 blending Ore Stacking parameters
| Item | Build volume (t) | Number of piled layers (layers) | Make heap flow (t/h) |
| Pile forming parameters | 70000 | 240 | 600 |
Step (2) preparation for sintering
The sintering recipe is shown in table 3:
TABLE 3 sintering ratio
| Item | Mixing ore | Coke powder | Dolomite | Limestone | Quick lime |
| Proportioning | 75.1 | 5.9 | 6.2 | 7.8 | 5.0 |
Step (3) sinter production
Controlling the sintering water content to be 8.8%, mixing, pelletizing and granulating, wherein the first mixing time is 5min, and the second mixing time is 5.5 min; controlling the ignition temperature at 1060 ℃ and the ignition time at 2.7 min; the thick material layer is adopted for sintering, and the material pressing operation is carried out on the sintering material surface, so that the material surface shrinkage is reduced, the density of the sintering ore is improved, and the sintering ore is finally obtained.
The agglomerate quality is shown in table 4:
TABLE 4 quality index of sinter
| Item | Tumbler index | Proportion of < 10mm |
| Index (I) | 80.79 | 18.34 |
Example 3
The method for producing the sintered ore based on the high-crystal-water limonite and the magnetic separation tailings comprises the following steps:
step (1) optimizing ore blending
When high crystal water limonite is used, a certain proportion of fine-grained concentrate is added to obtain a uniformly mixed ore; the blended ore comprises the following materials in mass fraction as shown in table 1:
TABLE 1 blending ratio of ore
| Limonite | Fine fraction concentrate | Magnetic separation tailings | Return ores for blast furnace | Total up to |
| 45 | 33 | 8 | 14 | 100 |
The stacking parameters are shown in table 2:
TABLE 2 blending Ore Stacking parameters
| Item | Build volume (t) | Number of piled layers (layers) | Make heap flow (t/h) |
| Pile forming parameters | 70000 | 240 | 600 |
Step (2) preparation for sintering
The sintering recipe is shown in table 3:
TABLE 3 sintering ratio
| Item | Mixing ore | Coke powder | Dolomite | Limestone | Quick lime |
| Proportioning | 75.7 | 5.6 | 5.8 | 7.4 | 5.5 |
Step (3) sinter production
Controlling the sintering water content to be 8.2%, mixing, pelletizing and granulating, wherein the first mixing time is 5min, and the second mixing time is 5.5 min; controlling the ignition temperature at 1800 ℃ and the ignition time at 2.5 min; the thick material layer is adopted for sintering, and the material pressing operation is carried out on the sintering material surface, so that the material surface shrinkage is reduced, the density of the sintering ore is improved, and the sintering ore is finally obtained.
The agglomerate quality is shown in table 4:
TABLE 4 quality index of sinter
| Item | Tumbler index | Proportion of < 10mm |
| Index (I) | 81.01 | 17.99 |
Comparative test
Comparative experiment 1: sinter quality not produced using the invention
From the conventional sintering production process, when limonite is used in a large proportion, the liquid phase flow in the limonite sintering process is faster due to the fact that the proportion of fine-fraction concentrate is small or the fine-fraction concentrate is not added, a large number of thin-wall macropores are generated, and the strength of the sintered ore is reduced; if a certain amount of magnetic separation tailings are added when high crystal water limonite is used in a large proportion, the pelletizing performance of the magnetic separation tailings is poor, and the sintering moisture is generally controlled to be 7-8% during conventional sintering, so that the pelletizing effect is poor, and the quality of sintered mineral products is influenced; meanwhile, because the coke powder has fine granularity and short high-temperature retention time, the sintering process of the limonite is endothermic reaction, so that insufficient heat is caused, and finally the quality of the sintered mineral product is reduced.
Production cases in which the invention was not implemented:
step (1) ore blending aspect
When the high crystal water limonite is used, other fine ore and concentrate are added to obtain a uniformly mixed ore; the blended ore comprises the following materials in mass fraction as shown in table 1:
TABLE 1 blending ratio of ore
| Limonite | Concentrate ore | Fine ore | Magnetic separation tailings | Return ores for blast furnace | Total up to |
| 45 | 15 | 21 | 5 | 14 | 100 |
The stacking parameters are shown in table 2:
TABLE 2 blending Ore Stacking parameters
| Item | Build volume (t) | Number of piled layers (layers) | Make heap flow (t/h) |
| Pile forming parameters | 70000 | 240 | 600 |
Step (2) preparation for sintering
The sintering recipe is shown in table 3:
TABLE 3 sintering ratio
| Item | Mixing ore | Coke powder | Dolomite | Limestone | Quick lime |
| Proportioning | 75.4 | 5.5 | 7 | 9.1 | 3.0 |
Step (3) sinter production
Controlling the sintering moisture to be 7.5%, mixing, pelletizing and granulating, wherein the first mixing time is 4min, and the second mixing time is 5 min; the ignition temperature is controlled to be about 1100 ℃, and the ignition time is controlled to be 3 min; and (5) adopting a thick material layer for sintering to finally obtain the sintered ore.
The agglomerate quality is shown in table 4:
TABLE 4 quality index of sinter
| Item | Tumbler index | Proportion of < 10mm |
| Index (I) | 78.69 | 24.31 |
Comparative experiment 2:
the magnetic separation tailings with the particle size of-200 mm accounts for about 70 percent, and the rest is the same as that in the example 1.
Comparative experiment 3:
the ratio of coke powder particle size < 3mm was controlled to 60%, and the rest was the same as in example 1.
Compared with the quality of the sinter produced without using the invention:
TABLE 5 sintered mineral content contrast
| Item | Tumbler index | Proportion of < 10mm |
| Comparative experiment 1 | 78.69 | 24.31 |
| Comparative experiment 2 | 78.62 | 25.61 |
| Comparative experiment 3 | 78.19 | 24.79 |
| Example 1 | 80.53 | 19.86 |
| Example 2 | 80.79 | 18.34 |
| Example 3 | 81.01 | 17.99 |
As shown in Table 5, after the invention is used, the quality of the sintered ore is greatly improved, the physical index is improved, and the production requirement of the blast furnace is met.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A method for producing sinter based on high crystal water limonite and magnetic separation tailings is characterized by comprising the following steps: the method comprises the following steps:
during ore blending, fine-grained concentrate is used as adhesive powder and is adhered to the surface of limonite during sintering and pelletizing, so that the low assimilation temperature of the limonite is delayed, the liquid phase flow is good, and the generation of thin-walled macropores of sintered ores is reduced;
the proportion of the magnetic separation tailings in a particle size of 200 meshes is improved, the particle size is reduced, the assimilation temperature of the magnetic separation tailings is reduced, the magnetic separation tailings are used as adhesive materials to be wrapped on the surface of limonite, and sintered ore is finally obtained through sintering.
2. A method for producing sinter based on high crystal water limonite and magnetic separation tailings is characterized by comprising the following steps: the method comprises the following steps:
step (1) optimizing ore blending
When high crystal water limonite is used, a certain proportion of fine-grained concentrate is added to obtain a uniformly mixed ore; the uniformly mixed ore comprises the following materials in percentage by mass:
40-70% of high crystal water limonite, not less than 15% of fine-fraction concentrate, 3-8% of magnetic separation tailings and the balance of blast furnace return ores, wherein the total amount is 100%;
step (2) preparation for sintering
Preparing the following materials in percentage by mass:
4-6% of quicklime, 5-7% of dolomite, 3-5% of limestone, 73-77% of blending ore and the balance of coke powder, wherein the total amount is 100%;
step (3) sinter production
Controlling the sintering water content to be 8% -10%, mixing, pelletizing and granulating, wherein the first mixing time is 4-7 min, and the second mixing time is 4-6 min; the ignition temperature is controlled at 1050 ℃ and 1100 ℃, and the ignition time is controlled at 2.5-3 min; the thick material layer is adopted for sintering, and the material pressing operation is carried out on the sintering material surface, so that the material surface shrinkage is reduced, the density of the sintering ore is improved, and the sintering ore is finally obtained.
3. The method for producing sintered ore based on high crystal water limonite and magnetic separation tailings according to claim 2, wherein the method comprises the following steps: in the step (1), the proportion of the-200-mesh particle size in the magnetic separation tailings is more than 85%.
4. The method for producing sintered ore based on high crystal water limonite and magnetic separation tailings according to claim 2, wherein the method comprises the following steps: in the step (2), the coke powder with the granularity of less than 3mm accounts for (75 +/-2)%, and the coke powder with the granularity of less than 1mm accounts for less than or equal to 40%.
5. The method for producing sintered ore based on high crystal water limonite and magnetic separation tailings according to claim 2, wherein the method comprises the following steps: in the step (3), the machine speed of the sintering machine is controlled to be 0.95-1.45m/min, so that the speed of the sintering machine is ensured to be uniform and continuous.
6. The method for producing sintered ore based on high crystal water limonite and magnetic separation tailings according to claim 2, wherein the method comprises the following steps: in the step (3), the base number of the basicity of the sinter is 2.05-2.5 times; the MgO content in the sintered ore is controlled to be 2.6-3.1%.
7. The utility model provides a sintering deposit based on high crystal water limonite and magnetic separation tailings which characterized in that: preparing the following materials in percentage by mass:
4-6% of quicklime, 5-7% of dolomite, 3-5% of limestone, 73-77% of blending ore and the balance of coke powder, wherein the total amount is 100%;
the uniformly mixed ore comprises the following materials in percentage by mass:
40-60% of high crystal water limonite, not less than 15% of fine-fraction concentrate, 3-8% of magnetic separation tailings and the balance of blast furnace return ores, wherein the total amount is 100%.
8. Sintered ore obtained by the production method according to any one of claims 1 to 6.
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| CN115181851A (en) * | 2022-06-28 | 2022-10-14 | 鞍钢股份有限公司 | Method for preparing sintered ore from high-crystal-water iron ore powder |
| CN116875798A (en) * | 2023-09-09 | 2023-10-13 | 吕梁建龙实业有限公司 | Iron ore sintering optimization method |
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