CN112609071A - Based on MgO/Al2O3Novel sintering ore blending method for regulating calcium ferrite-based binder phase - Google Patents
Based on MgO/Al2O3Novel sintering ore blending method for regulating calcium ferrite-based binder phase Download PDFInfo
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- CN112609071A CN112609071A CN202011199660.9A CN202011199660A CN112609071A CN 112609071 A CN112609071 A CN 112609071A CN 202011199660 A CN202011199660 A CN 202011199660A CN 112609071 A CN112609071 A CN 112609071A
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- Prior art keywords
- mgo
- sintering
- temperature
- calcium ferrite
- liquid phase
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- 238000005245 sintering Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 30
- WETINTNJFLGREW-UHFFFAOYSA-N calcium;iron;tetrahydrate Chemical compound O.O.O.O.[Ca].[Fe].[Fe] WETINTNJFLGREW-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 238000002156 mixing Methods 0.000 title claims abstract description 9
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 9
- 239000011230 binding agent Substances 0.000 title description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 19
- 239000012071 phase Substances 0.000 claims abstract description 19
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 19
- 230000008569 process Effects 0.000 claims abstract description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000007791 liquid phase Substances 0.000 claims abstract description 11
- 230000001276 controlling effect Effects 0.000 claims abstract description 8
- 229910052742 iron Inorganic materials 0.000 claims abstract description 5
- 239000002994 raw material Substances 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 9
- 230000008018 melting Effects 0.000 claims description 9
- 230000015572 biosynthetic process Effects 0.000 claims 3
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000005054 agglomeration Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 230000002776 aggregation Effects 0.000 abstract description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 abstract 3
- 239000000395 magnesium oxide Substances 0.000 abstract 3
- 229910000838 Al alloy Inorganic materials 0.000 abstract 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 abstract 1
- 238000005457 optimization Methods 0.000 abstract 1
- 239000002893 slag Substances 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 239000002131 composite material Substances 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- BYFGZMCJNACEKR-UHFFFAOYSA-N aluminium(i) oxide Chemical compound [Al]O[Al] BYFGZMCJNACEKR-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000010587 phase diagram Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910003112 MgO-Al2O3 Inorganic materials 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000003746 solid phase reaction Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
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
Abstract
The invention belongs to the field of iron ore agglomeration in an iron-making process and discloses a method for preparing a magnesium oxide/aluminum alloy based iron ore agglomeration2O3A novel sintering ore blending method for regulating and controlling a calcium ferrite-based binding phase. The method comprises analyzing the components of the sintering material, and adjusting MgO/Al2O3To a certain extent, the adjusted MgO/Al is verified2O3The liquid phase forming ability of the sintering material. The invention brings technical progress to many aspects such as theoretical foundation perfection, process progress, flow improvement and optimization of sinter production.
Description
Technical Field
The invention belongs to the field of iron ore agglomeration in an iron-making process, relates to a new method for controlling liquid phase generation in a sintering process, and particularly relates to a new sintering ore blending method for regulating and controlling a calcium ferrite-based binder phase based on MgO/Al2O 3.
Background
Blast furnace ironmaking is still an important component of a 'blast furnace-converter' flow in steel production at present, and the proportion of sinter in blast furnace ironmaking raw materials exceeds 70%, so that the quality of the sinter has important influence on smooth operation of a blast furnace and economic benefit of steel enterprises.
In the process of sintering and forming the ore, the strength and the metallurgical performance of the sintered ore are directly influenced by the liquid phase generation rule and the ore phase structure, and the calcium ferrite-based binding phase is mainly composed of the liquid phase in the sintering process, so that the generation and the control of the calcium ferrite-based binding phase are worth vigorous research.
The calcium ferrite-based binding phase is an ore phase structure with higher strength and good reduction performance, is the earliest formed substance in solid phase reaction, and contains CaO and Fe at the temperature of 500-600 DEG C2O3Calcium ferrite begins to be generated, the temperature is increased, and the reaction rate is increased.
Research shows that Al is added in the sintering process2O3Can be dissolved in calcium ferrite to increase the content of composite calcium ferrite, reduce magnetite and silicate, and promote the generation of calcium ferriteWith and Al2O3Can refine the crystal form of calcium ferrite and improve the performance of sintering, mining and metallurgy. On the other hand, Al2O3The existence of a large amount of solid solution composite calcium ferrite is also one of the causes of the deterioration of sintering performance.
In blast furnace smelting, Al is contained in the burden2O3The content is increased, which causes a series of problems of reduced slag desulfurization capability, difficult slag iron separation and the like.
The slag contains a proper amount of MgO, which is important for blast furnace production and mainly represented by: can improve the fluidity of the slag and the desulfurization capability of the slag, inhibit the circulating accumulation of alkali metal in the furnace, improve the alkali discharge rate of the slag and the like. The excessive MgO content in the sintered ore can affect the metallurgical performance of the sintered ore, thereby affecting the production of the blast furnace.
Therefore, under the condition of specific raw materials, MgO and Al in the sintered ore are optimized and controlled2O3In particular of MgO/Al2O3Has important significance.
Disclosure of Invention
The invention aims to provide a catalyst based on MgO/Al2O3The new method for regulating and controlling the sintering and ore blending of calcium ferrite-based binding phase is realized by specific MgO/Al2O3The ranges of MgO and Al are adjusted separately2O3The content of the calcium ferrite is controlled accurately to generate the calcium ferrite-based binding phase.
The second object of the present invention is to control the ratio of MgO/Al2O3The content and the element composition of the sintering raw material are adjusted, and the sintering ore with good metallurgical performance indexes is provided.
The technical scheme of the invention is as follows: based on MgO/Al2O3The novel sintering ore blending method for regulating and controlling the calcium ferrite-based binder phase comprises the following steps of:
based on phase diagram analysis, FeOx-SiO is obtained2-CaO-MgO-Al2O3Optimum MgO/Al in sintering process under five-membered system2O3And (3) a range.
Performing basic chemical analysis and basic sintering performance detection on sintering raw materials, and analyzing MgO and Al of all raw materials in an important way2O3And (4) content.
Based on the optimal MgO/Al2O3And (4) proportioning the sintering raw materials.
And carrying out experimental study and analysis on the fluidity index of the sintering raw material, the liquid phase generation temperature and the melting time.
The composition and microstructure of the mineral phase of the sintered finished product are researched whether to accord with the expected result
The above steps are combined to obtain a catalyst based on MgO/Al2O3A novel sintering ore blending method for regulating and controlling a calcium ferrite-based binding phase.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1 shows a MgO/Al-based alloy2O3A flow chart of a novel sintering ore blending method for regulating and controlling a calcium ferrite-based binding phase.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention will be described in detail below with reference to the attached drawings and specific embodiments according to examples of the present invention, it should be understood that the specific embodiments described herein are only for the purpose of illustration and understanding of the present invention, and are not intended to limit the present invention. The percentages in the invention are all mass percentages except for special descriptions.
In order to explain the technical solution of the present invention in more detail, the following embodiments are described in detail, and it should be particularly noted that the features of the embodiments and examples in the present invention are not limited to the technical solution of the present invention, and the technical features of the embodiments and examples in the present invention may be combined with each other without conflict.
The general idea and implementation steps of the embodiment are as follows:
the main components of a sintering material are shown in Table 1.
TABLE 1 certain sintering raw materials main component
Looking up the phase diagram when MgO/Al2O3The ratio is within the range of 0.49-0.66, the composite calcium ferrite binding phase has better fluidity, the sintering performance is optimal in the range, and the sintering process is smooth.
The sintering raw material MgO/Al is adjusted by adding additive (dolomite powder)2O3Is in the range of 0.49 to 0.66.
By adjusting MgO/Al2O3And (changing between 0.49 and 0.66) analyzing the change rule of the fluidity index, the liquid phase generation temperature and the melting time of the calcium ferrite-based binding phase.
The experimental analysis shows that MgO/Al2O3When the temperature is changed between 0.49 and 0.66, the fluidity index of the calcium ferrite-based binding phase is 0.7 to 1.6, and the liquid phase generation temperature and the melting time are MgO/Al2O3And a minimum value of 0.65.
For different MgO/Al2O3The following proportions are compared in sintering experiments, and MgO/Al2O3When the sintering process is more smooth when the sintering temperature is 0.65, phase detection (xrd) analysis shows that the main mineral composite calcium ferrite has needle-shaped and interlaced microstructure and excellent metallurgical performance.
By combining the above analysis, the ore is sintered to select MgO/Al2O3The optimal ratio is 0.65.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be within the scope of the claims of the present invention.
Claims (9)
1. Based on MgO/Al2O3The new method for regulating and controlling the sintering ore blending of the calcium ferrite-based binding phase is characterized in that: by adjusting MgO and Al2O3In such an amount that MgO/Al as a sintering raw material is contained2O3Within a certain range.
2. The method of claim 1, wherein the MgO/Al is2O3In the range of 0.49-0.65.
3. The method of claim 1, wherein the MgO/Al is adjusted2O3And only adjusting the MgO content aiming at the current iron ore resource.
4. The novel method of claim 1, wherein the control of the calcium ferrite-based bonding is performed by adjusting the fluidity index, the generation temperature and the melting time of the sintering liquid phase.
5. The novel process of claim 4, wherein the fluidity index, the formation temperature and the melting time of the sintering liquid phase are measured by a melting point and melting speed meter.
6. The method of claim 5, wherein the fluidity index is the area of the sample after flowing/the area of the sample before flowing, and the larger the fluidity index is, the stronger the fluidity is.
7. The method of claim 5, wherein the melting time is defined as＝The time taken for the sample to deform until the sample completely flows, namely the time taken in the stage that the shrinkage rate is 10-80%, and the shorter the melting time is, the better the fluidity is.
8. The novel process as claimed in claim 5, wherein the temperature at which the effective liquid phase formation begins corresponds to a shrinkage of 20%, denoted T20(ii) a The temperature at which the shrinkage is 50% corresponds to the effective liquid phase formation termination temperature, denoted T50(ii) a The temperature at which the shrinkage is 80% corresponds to the flow temperature.
9. The novel process as claimed in claim 1, characterized in that the basicity (CaO/SiO) of the pattern is set2Mass ratio) of 2.0 to 2.2.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010707402 | 2020-07-21 | ||
| CN2020107074020 | 2020-07-21 |
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| CN112609071A true CN112609071A (en) | 2021-04-06 |
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| CN202011199660.9A Pending CN112609071A (en) | 2020-07-21 | 2020-10-30 | Based on MgO/Al2O3Novel sintering ore blending method for regulating calcium ferrite-based binder phase |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05214453A (en) * | 1992-01-30 | 1993-08-24 | Nippon Steel Corp | Manufacture of sintered ore |
| JP2003129141A (en) * | 2001-08-15 | 2003-05-08 | Nkk Corp | Sintered ore for blast furnace and manufacturing method therefor |
| CN1962897A (en) * | 2006-11-30 | 2007-05-16 | 武汉钢铁(集团)公司 | Sintered ore capable of improving viscosity of blast furnace slag and process for preparing same |
| CN109680110A (en) * | 2019-01-29 | 2019-04-26 | 北京科技大学 | Optimize MgO in the method for blast furnace ferrous furnace charge sinter and pellet distribution ratio |
-
2020
- 2020-10-30 CN CN202011199660.9A patent/CN112609071A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05214453A (en) * | 1992-01-30 | 1993-08-24 | Nippon Steel Corp | Manufacture of sintered ore |
| JP2003129141A (en) * | 2001-08-15 | 2003-05-08 | Nkk Corp | Sintered ore for blast furnace and manufacturing method therefor |
| CN1962897A (en) * | 2006-11-30 | 2007-05-16 | 武汉钢铁(集团)公司 | Sintered ore capable of improving viscosity of blast furnace slag and process for preparing same |
| CN109680110A (en) * | 2019-01-29 | 2019-04-26 | 北京科技大学 | Optimize MgO in the method for blast furnace ferrous furnace charge sinter and pellet distribution ratio |
Non-Patent Citations (1)
| Title |
|---|
| 胡庆生，张国柱，崔利民: "MgO/Al2O3比对铁矿粉烧结液相生成的影响", 烧结球团, vol. 41, no. 5, pages 19 - 23 * |
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