CN113789440A - Preparation method of vanadium-titanium pellet ore - Google Patents
Preparation method of vanadium-titanium pellet ore Download PDFInfo
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- CN113789440A CN113789440A CN202111142900.6A CN202111142900A CN113789440A CN 113789440 A CN113789440 A CN 113789440A CN 202111142900 A CN202111142900 A CN 202111142900A CN 113789440 A CN113789440 A CN 113789440A
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- 239000008188 pellet Substances 0.000 title claims abstract description 74
- GFNGCDBZVSLSFT-UHFFFAOYSA-N titanium vanadium Chemical compound [Ti].[V] GFNGCDBZVSLSFT-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 31
- 239000000463 material Substances 0.000 claims abstract description 25
- 238000000227 grinding Methods 0.000 claims abstract description 20
- 238000005453 pelletization Methods 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 238000001238 wet grinding Methods 0.000 claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- 238000007873 sieving Methods 0.000 claims abstract description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical group [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 28
- 239000000843 powder Substances 0.000 claims description 21
- 238000005245 sintering Methods 0.000 claims description 20
- 239000000292 calcium oxide Substances 0.000 claims description 14
- 235000012255 calcium oxide Nutrition 0.000 claims description 14
- 239000012141 concentrate Substances 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000001035 drying Methods 0.000 claims description 10
- 239000000440 bentonite Substances 0.000 claims description 9
- 229910000278 bentonite Inorganic materials 0.000 claims description 9
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 9
- 230000004907 flux Effects 0.000 claims description 9
- 238000009736 wetting Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 5
- 230000029087 digestion Effects 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 15
- 238000002156 mixing Methods 0.000 abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- 238000005054 agglomeration Methods 0.000 abstract description 3
- 230000002776 aggregation Effects 0.000 abstract description 3
- 239000004449 solid propellant Substances 0.000 abstract description 3
- 238000009851 ferrous metallurgy Methods 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 description 11
- 238000003723 Smelting Methods 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000010936 titanium Substances 0.000 description 6
- 229910052719 titanium Inorganic materials 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 239000007791 liquid phase Substances 0.000 description 4
- 239000002609 medium Substances 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 235000019738 Limestone Nutrition 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 3
- 239000006028 limestone Substances 0.000 description 3
- 238000012216 screening Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007596 consolidation process Methods 0.000 description 2
- 238000009837 dry grinding Methods 0.000 description 2
- 235000013312 flour Nutrition 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 206010016173 Fall Diseases 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- MRHSJWPXCLEHNI-UHFFFAOYSA-N [Ti].[V].[Fe] Chemical compound [Ti].[V].[Fe] MRHSJWPXCLEHNI-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- WETINTNJFLGREW-UHFFFAOYSA-N calcium;iron;tetrahydrate Chemical compound O.O.O.O.[Ca].[Fe].[Fe] WETINTNJFLGREW-UHFFFAOYSA-N 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000006562 flour medium Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 239000000080 wetting agent Substances 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
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
-
- 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
-
- 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
- C22B1/214—Sintering; Agglomerating in shaft furnaces
-
- 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
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (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)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a preparation method of vanadium-titanium pellets, belonging to the field of ferrous metallurgy. The preparation method of the vanadium-titanium pellet ore comprises the following steps: a. sieving sintered return ores; b. respectively carrying out fine grinding on the raw materials; c. blending, namely, carrying out wet grinding on the blended raw materials; d. adding the sintered return ores in the step a into a pelletizing disc to manufacture mother balls, then adding the materials subjected to the wet grinding in the step c to wrap the mother balls to obtain green balls with the granularity of 8-16mm, and then roasting. The vanadium-titanium sinter is screened and finely ground, and is prepared in another agglomeration form, so that the utilization efficiency of the sinter is improved, the solid fuel consumption in the iron-making process and the carbon emission in the iron-making process flow are reduced, and the problems of low yield and low drum strength of the existing vanadium-titanium sinter can be effectively solved.
Description
Technical Field
The invention belongs to the field of ferrous metallurgy, and particularly relates to a preparation method of vanadium-titanium pellets.
Background
At present, the vanadium titano-magnetite in China has the characteristics of low TFe, high Mg, Al and Ti contents, poor sintering performance and more high-melting-point CaO.TiO generated in the sintering process2Phase, the liquid phase quantity is insufficient in the sintering process, the shape and the structure of a binding phase are unreasonable, the strength of the sintering ore is poor, the brittleness is high, and vanadium-titanium sintering is causedThe use of the vanadium-titanium sinter seriously restricts the further improvement of the blast furnace smelting technical and economic indexes.
CN104313302A of 28 days of 1 month and 2015 discloses a preparation method of vanadium-titanium pellets, wherein 98-99.5 parts by weight of vanadium-titanium magnetite and 0.5-2.0 parts by weight of binder are mixed to obtain a mixture, then the mixture is pelletized to obtain vanadium-titanium green pellets, the vanadium-titanium green pellets are roasted to obtain vanadium-titanium pellets, and the oxygen enrichment rate is kept at 1-6% in the roasting process. The method further improves the strength of the pellet ore by introducing rich oxygen in the roasting process, and the produced pellet ore can only meet the smelting requirement of the blast furnace with small proportion and by adding other high-alkalinity materials.
26-8-2015 CN104862472A discloses vanadium-titanium pellets and a preparation method thereof, which are characterized in that sea sand vanadium-titanium-iron ore concentrate is mixed with bentonite to obtain a mixture, and then the mixture is sequentially subjected to wet grinding, pelletizing, drying, preheating and oxidizing roasting to obtain the vanadium-titanium pellets. The method provides an application method for the traditional vanadium-titanium pellet preparation technology and only provides a sea sand vanadium-titanium magnetite ore, the produced vanadium-titanium pellets are acid pellets, the pellet reducibility is low, the high-titanium vanadium-titanium sinter return ore cannot be utilized, and the problem of high processing cost of the high-titanium vanadium-titanium sinter cannot be solved.
Therefore, it is necessary to research a new preparation method of vanadium-titanium pellet ore to improve the problems of low yield and low drum strength of vanadium-titanium sinter ore.
Disclosure of Invention
The invention aims to solve the technical problems of low yield and low drum strength of the existing vanadium-titanium sinter.
The technical scheme adopted by the invention for solving the technical problems is as follows: the preparation method of the vanadium-titanium pellet ore comprises the following steps:
a. sieving the sintered return ores according to the grades of 5-3mm, 3-1mm and less than 1 mm;
b. b, respectively carrying out fine grinding on the sintered return ores, vanadium-titanium concentrates, domestic high-powder and medium-powder, secondary resources and the flux which are in the grade of less than 1mm in the step a until the granularity reaches-200 meshes, wherein the percentage of the sintered return ores, the vanadium-titanium concentrates, the domestic high-powder and medium-powder is more than 65%;
c. b, mixing materials, namely, mixing 45-60% of vanadium-titanium concentrate obtained in the step b, 15-20% of domestic high powder, 5-10% of medium powder, 5-10% of sintering return ores, 6-15% of flux and 0.5-1% of bentonite according to the mass percentage of the raw materials required for sintering, and performing wet grinding on the mixed raw materials;
d. adding 3-1 mm-grade sintered return ores in the step a into a pelletizing disc to manufacture mother balls, then adding the materials subjected to wet grinding in the step c to wrap the mother balls to obtain green balls with the granularity of 8-16mm, and then roasting.
In the step a, 5-3mm grade sintered ore is returned to the blast furnace for utilization.
In the step b, a cement mill is adopted for fine grinding.
In the step b, the flux is quicklime and/or activated ash, the finely ground quicklime or activated ash is digested, water is added according to the content of effective CaO contained in the quicklime or activated ash for digestion for 10 min.
In the step c, the proportion of the bentonite with the granularity less than 0.074mm is more than 95 percent.
And c, adopting a high-pressure moistening and grinding machine to moisten and grind for 5 min.
In the step d, a disc pelletizer is adopted for pelletizing, wherein the diameter of the disc pelletizer is 1000 multiplied by 350mm, the rotating speed is 20-25r/min, and the inclination angle is 40-50 degrees and can be adjusted.
And d, spraying atomized water on the surface of the mother ball before adding the abrasive.
In the step d, after the wetting and grinding material is added, atomizing water and the wetting and grinding material are continuously supplemented, so that the green pellets are continuously grown until green pellets with the granularity of 8-16mm are obtained.
Furthermore, in the step d, the green ball moisture is controlled to be 7.5-8.5%.
Furthermore, in the step d, the falling strength of the green ball at 0.5m is controlled to be more than 5 times per green ball, and the compressive strength is controlled to be more than 10N per green ball.
The roasting comprises the following steps: uniformly placing green pellets with the granularity of 8-16mm in a roasting furnace, drying, roasting after preheating, taking out the pellets after roasting, and naturally cooling.
Furthermore, the preheating and roasting are carried out by adopting an experimental high-temperature vertical roasting furnace, the temperature rise speed and the temperature value can be set, and the maximum roasting temperature is 1300 ℃.
Furthermore, the drying temperature is controlled to be 200-; the preheating temperature is 800-.
The invention has the beneficial effects that: the invention provides a novel agglomeration process technical route for carrying out fine grinding, proportioning, wet grinding, uniform mixing, pelletizing and roasting on a vanadium-titanium sintering raw material under the conditions of not reducing the proportion of vanadium-titanium ore smelting based on a blast furnace and not changing a slagging system, and forms a preparation method of vanadium-titanium pellet ore.
According to the invention, through screening and fine grinding treatment of the vanadium-titanium sinter return ores, natural mother balls are provided for the pelletizing process, meanwhile, the utilization efficiency of the sinter return ores is improved, and the problem of high total return ore rate of the high-titanium vanadium-titanium sinter ores is effectively improved; the sintering material is prepared in another agglomeration form, so that the problems of low yield of vanadium-titanium sintering ore and low drum strength are effectively solved, the solid fuel consumption in the iron-making process is reduced, and the carbon emission of the iron-making process flow is further reduced; although the liquid phase quantity in the pellet is increased, the solid-phase consolidation action is poor and the compressive strength is low, more uniform and regular small holes are formed after the liquid phase is cooled, the vanadium-titanium pellet prepared by the sintering material has a remarkable effect of improving the reduction performance of the pellet, and the consumption of blast furnace coke can be further reduced; the vanadium-titanium pellet prepared by the sintering material has no influence on the charging components of the blast furnace, so that the existing blast furnace smelting system is not influenced by adding the vanadium-titanium pellet into the blast furnace, and a foundation is laid for improving the pellet proportion smelting of the blast furnace.
The preparation method of the vanadium-titanium pellet ore can obviously improve the problems of low yield of vanadium-titanium sintered ore and low drum strength, and combines the control of the roasting process of the invention, thereby not only laying a foundation for blast furnace reinforced smelting, but also further reducing the solid fuel consumption in the sintering process, creating conditions for carbon emission reduction of iron and steel enterprises and improving the enterprise competitiveness.
Detailed Description
The technical solution of the present invention can be specifically implemented as follows.
The preparation method of the vanadium-titanium pellet ore comprises the following steps:
a. sieving the sintered return ores according to the grades of 5-3mm, 3-1mm and less than 1 mm;
b. b, respectively carrying out fine grinding on the sintered return ores, vanadium-titanium concentrates, domestic high-powder and medium-powder, secondary resources and the flux which are in the grade of less than 1mm in the step a until the granularity reaches-200 meshes, wherein the percentage of the sintered return ores, the vanadium-titanium concentrates, the domestic high-powder and medium-powder is more than 65%;
c. b, mixing materials, namely, mixing 45-60% of vanadium-titanium concentrate obtained in the step b, 15-20% of domestic high powder, 5-10% of medium powder, 5-10% of sintering return ores, 6-15% of flux and 0.5-1% of bentonite according to the mass percentage of the raw materials required for sintering, and performing wet grinding on the mixed raw materials;
d. adding 3-1 mm-grade sintered return ores in the step a into a pelletizing disc to manufacture mother balls, then adding the materials subjected to wet grinding in the step c to wrap the mother balls to obtain green balls with the granularity of 8-16mm, and then roasting.
In order to reduce the total return rate of the high-titanium type vanadium-titanium sintered ore, it is preferable that in the step a, 5 to 3 mm-grade sintered ore is returned to the blast furnace for use.
In order to achieve better experimental effect, it is therefore preferable that in the step b, a cement mill is used for fine grinding; the flux is quicklime or active ash, the finely ground quicklime or active ash is subjected to digestion treatment, and water is added according to the effective CaO content in the quicklime or active ash for digestion for 10 min.
In order to further improve the pelletizing rate and the pellet production quality of green pellets, it is preferred that in step c, the proportion of the bentonite with the grain size of less than 0.074mm is more than 95%, and the bentonite is used as a binder.
In order to ensure the uniform mixing of various materials and enhance the specific surface area of the pelletizing materials, a high-pressure moistening and grinding machine is preferably adopted for moistening and grinding, and the moistening and grinding time is 5 min.
In order to obtain better green balls, it is preferable that in the step d, a disc pelletizer is used for pelletizing, wherein the disc pelletizer has a diameter of 1000 × 350mm, a rotating speed of 20-25r/min and an adjustable inclination angle of 40-50 °.
In order to improve the yield and the drum strength of the vanadium-titanium sintered ore, it is preferable that atomized water is sprayed on the surface of the mother ball before the wetting agent is added in the step d; after the wetting and grinding material is added, continuously supplementing atomizing water and wetting and grinding the material to continuously grow the green pellets until green pellets with the granularity of 8-16mm are obtained; more preferably, the green ball moisture is controlled to be 7.5-8.5%; the falling strength of green balls at 0.5m is controlled to be more than 5 times per green ball, and the compressive strength is controlled to be more than 10N per green ball.
For better experimental results, it is therefore preferred that the calcination is: uniformly placing green pellets with the particle size of 8-16mm in a roasting furnace, drying, roasting after preheating, taking out the pellets after roasting, and naturally cooling; more preferably, the preheating and roasting are carried out by adopting an experimental high-temperature vertical roasting furnace, the heating speed and the temperature value can be set, and the highest roasting temperature is 1300 ℃; controlling the drying temperature at 200 ℃ and 250 ℃ for 10-20 min; the preheating temperature is 800-.
The technical solution and effects of the present invention will be further described below by way of practical examples.
Examples
The invention provides three groups of examples for preparing vanadium-titanium pellets by adopting the method of the invention and a group of comparative examples for preparing sintered ores by adopting the prior art, wherein the main chemical components of the raw materials adopted in the examples are shown in Table 1.
TABLE 1 main chemical composition of raw materials%
1. Specific experimental procedures for examples 1-3:
a. screening high-titanium vanadium-titanium sintered return ores, wherein the screened grade is three grades of 5-3mm, 3-1mm and less than 1mm, and the part of 5-3mm is used as small-grade sintered ores and directly returned to a blast furnace for smelting;
b. b, putting the sintered return ores, the vanadium-titanium concentrates, the domestic high powder, the medium powder, the secondary resources, the limestone and the active ash which are in the grade of less than 1mm in the step a into an oven for drying, wherein the temperature is set to be 150 ℃, and the drying time is 2 hours; putting the dried material into a cement mill for dry milling treatment, wherein the dry milling time is 7min (the particle size reaches-200 meshes and is more than 65%);
c. mixing, specifically mixing the materials in examples 1-3 as shown in Table 2, putting the mixed materials into a wet grinding machine for fully wet grinding and uniformly mixing for 5min to form a mixed material;
TABLE 2 examples 1-3 pellet feed proportioning%
| Vanadium-titanium concentrate | Domestic high flour | Medium powder | Return ore | Active ash | Limestone | Bentonite clay | R | |
| Example 1 | 55 | 17 | 10 | 5 | 5.5 | 7 | 0.5 | 1.83 |
| Example 2 | 55 | 17 | 9.5 | 5 | 6 | 7 | 0.5 | 1.93 |
| Example 3 | 55 | 17 | 9 | 5 | 6.5 | 7 | 0.5 | 2.03 |
d. B, adding 3-1 mm-grade sintered return ores in the step a into a pelletizing disc for pelletizing mother balls, spraying atomized water on the surface of the sintered return ores for wetting treatment, then adding a mixture to enable the mixture to be gradually wrapped on the outer layer of the return ores and gradually grow to form vanadium-titanium green pellets with proper granularity (8-16mm), and controlling the water content, wherein the diameter of a disc pelletizer is 1000 x 350mm, the rotating speed is 20r/min, and the inclination angle is 48 degrees; detecting the falling strength and the compressive strength of the obtained green pellets, wherein the falling strength detection method comprises the steps of increasing the height of the green pellets to 0.5M, then freely falling the green pellets onto an iron plate, and counting the breakage of the green pellets falling for several times as the falling times; the compression strength detection method comprises the steps of directly placing the green pellets into compression-resistant equipment for detection, wherein the results of moisture control and green pellet strength test are shown in table 3;
table 3 examples 1-3 pellet moisture and strength testing
| Green ball moisture/%) | Compressive strength/N/N | Drop strength/times/piece | |
| Example 1 | 8.0 | 14.69 | 5.3 |
| Example 2 | 8.0 | 16.32 | 6.5 |
| Example 3 | 8.0 | 17.54 | 7.1 |
e. And finally, placing the prepared vanadium-titanium green pellets into a high-temperature vertical roasting furnace for drying, preheating and roasting, wherein the drying temperature is 200 ℃, the time is 10min, the preheating temperature is 800 ℃, the time is 15min, the roasting temperature is 1150 ℃ and the time is 30min, and naturally cooling the completely roasted cooked pellets for 6 h.
2. Preparation procedure of comparative example 1:
the raw materials are proportioned according to the weight percentage, and the specific mixture ratio is as follows: 55% of vanadium-titanium concentrate, 15% of domestic high flour, 8.5% of medium flour, 5% of secondary resource, 5.5% of active ash, 7% of limestone, 4.0% of coke powder and 7.5% of controlled sintering mixture water, uniformly distributing the mixture in a sintering cup for ignition sintering after uniform mixing and granulation, pouring out, cooling and screening after sintering.
3. The sintered ores prepared in examples 1 to 3 and comparative example 1 were subjected to tests for compressive strength, drum strength, yield and chemical composition, the results of which are shown in Table 4, and the results of the other tests are shown in Table 5.
TABLE 4 product ingredient detection/%)
| TFe | SiO2 | CaO | TiO2 | V2O5 | |
| Example 1 | 48.81 | 5.78 | 10.54 | 7.44 | 0.37 |
| Example 2 | 48.60 | 5.70 | 10.98 | 7.44 | 0.37 |
| Example 3 | 48.39 | 5.63 | 11.42 | 7.44 | 0.37 |
| Comparative example 1 | 48.25 | 5.90 | 10.77 | 7.65 | 0.38 |
TABLE 5 results of the remaining tests on the product
From the examples 1-3, it can be seen that as the basicity of the pellets is gradually increased, the falling and compressive strength of the green pellets are gradually improved, mainly because the proportion of the active ash is increased in the mixing process, the active ash has a large specific surface area and can play a role in binding iron-containing materials; in addition, along with the gradual increase of the alkalinity of the pellet ore, the compressive strength and the drum strength of the finished pellet are gradually reduced, the finished product rate and the reduction degree are gradually improved, the main reason is that liquid phases such as calcium ferrite, silicate and the like are generated in the roasting process,the solid phase consolidation is strengthened, but the compressive strength and the falling-down resistance of the material are lower than those of Fe2O3The connection capability of the whiskers leads to the internal porosity of the pellet, the compressive strength is reduced and the reduction degree is increased.
As can be seen from Table 5, the drum strength and the yield of the pellets in examples 1-3 are obviously higher than those in comparative example 1, the method of the invention remarkably improves the problem of poor quality of vanadium-titanium sintered ore, and simultaneously reduces the addition of coke in the pellet roasting process and carbon emission for the iron-making process.
Claims (10)
1. The preparation method of the vanadium-titanium pellet ore is characterized by comprising the following steps:
a. sieving the sintered return ores according to the grades of 5-3mm, 3-1mm and less than 1 mm;
b. b, respectively carrying out fine grinding on the sintered return ores, vanadium-titanium concentrates, domestic high-powder and medium-powder, secondary resources and the flux which are in the grade of less than 1mm in the step a until the granularity reaches-200 meshes, wherein the percentage of the sintered return ores, the vanadium-titanium concentrates, the domestic high-powder and medium-powder is more than 65%;
c. preparing materials, wherein the raw materials required by sintering are as follows by mass percent: 45-60% of vanadium-titanium concentrate obtained in the step b, 15-20% of domestic high powder, 5-10% of medium powder, 5-10% of sintered return ores, 6-15% of flux and 0.5-1% of bentonite, and performing wet grinding on the prepared raw materials;
d. adding 3-1 mm-grade sintered return ores in the step a into a pelletizing disc to manufacture mother balls, then adding the materials subjected to wet grinding in the step c to wrap the mother balls to obtain green balls with the granularity of 8-16mm, and then roasting.
2. The method for preparing vanadium-titanium pellets according to claim 1, characterized in that: in the step a, 5-3mm grade sintered ore is returned to the blast furnace for utilization.
3. The method for preparing vanadium-titanium pellets according to claim 1, characterized in that: in the step b, the flux is quicklime and/or activated ash, the finely ground quicklime or activated ash is digested, water is added according to the content of effective CaO contained in the quicklime or activated ash for digestion for 10 min.
4. The method for preparing vanadium-titanium pellets according to claim 1, characterized in that: in the step c, the proportion of the bentonite with the granularity less than 0.074mm is more than 95 percent.
5. The method for preparing vanadium-titanium pellets according to claim 1, characterized in that: and c, carrying out damp grinding by adopting a high-pressure damp grinding machine for 5 min.
6. The method for preparing vanadium-titanium pellets according to claim 1, characterized in that: d, before adding the abrasive, spraying atomized water on the surface of the mother ball; after the wetting and grinding material is added, atomizing water and the wetting and grinding material are continuously supplemented, so that the green pellets continuously grow until green pellets with the granularity of 8-16mm are obtained.
7. The method for preparing vanadium-titanium pellets according to claim 1, characterized in that: controlling the water content of green pellets to be 7.5-8.5%.
8. The method for preparing vanadium-titanium pellets according to claim 1, characterized in that: in the step d, the falling strength of the green ball with 0.5m is controlled to be more than 5 times per green ball, and the compressive strength is controlled to be more than 10N per green ball.
9. The method for preparing vanadium-titanium pellets according to claim 1, characterized in that: the roasting is to evenly place the green pellets in a roasting furnace, dry and preheat the green pellets, roast the green pellets, and take the green pellets out for natural cooling after the roasting is finished.
10. The method for preparing vanadium-titanium pellets according to claim 9, characterized in that: controlling the drying temperature at 200 ℃ and 250 ℃ for 10-20 min; the preheating temperature is 800-.
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