CN110629019A - Manufacturing method of ultralow-alkalinity high-strength sintered ore - Google Patents
Manufacturing method of ultralow-alkalinity high-strength sintered ore Download PDFInfo
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- CN110629019A CN110629019A CN201810662955.1A CN201810662955A CN110629019A CN 110629019 A CN110629019 A CN 110629019A CN 201810662955 A CN201810662955 A CN 201810662955A CN 110629019 A CN110629019 A CN 110629019A
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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
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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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- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
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Abstract
The invention discloses a method for manufacturing ultra-low alkalinity high-strength sintered ore, mainly aiming at solving the problem of using high SiO in the prior art2The low iron grade of the sinter produced by the content of the iron ore. The invention adopts the technical scheme that the manufacturing method of the ultra-low alkalinity high-strength sintered ore comprises the following steps: 1) preparing a magnesium flux; 2) proportioning, weighing iron ore and magnesium flux, and controlling the binary basicity R of sintered ore21.70-1.80 of SiO in the sintered ore25.0-5.7 wt%, 1.0-1.2 wt% of MgO; 3) uniformly mixing and granulating, namely transferring the primary uniformly mixed material into a secondary uniformly mixing roller for uniformly mixing and granulating to obtain a secondary uniformly mixed material after granulation; 4) and (4) performing air draft sintering on the secondary mixed material, and obtaining a finished sintered ore after sintering. The invention realizes the use of high SiO2The high-strength sintered ore produced by the iron ore with the content has obvious benefit.
Description
Technical Field
The invention relates to a method for manufacturing blast furnace ironmaking raw material sinter, in particular to a method for manufacturing ultralow-alkalinity high-strength sinter, belonging to the technical field of ferrous metallurgy sintering.
Background
The sinter is one of the main iron-containing raw materials for blast furnace iron making in China at present, and the high-grade and high-strength sinter is an important raw material technical guarantee for obtaining excellent technical and economic indexes in blast furnace smelting. For several years, with the increasing competition of the steel market and the deterioration of iron ore resources, many steel plants have to use some high SiO2Iron ore in a content of SiO in the iron ore to reduce cost2The mass content of the compound is more than or equal to 7 percent.
By using high SiO2The content of iron ore is used for producing sintered ore, and according to the traditional sintering process, in order to ensure that the sintered ore has good drum strength to meet the smelting requirement of a blast furnace, the binary alkalinity R is generally required2The control is over 1.95, and is even over 2.0 in many cases, so as to ensure the generation of sufficient bond-phase calcium ferrite; even if the so-called low-alkalinity sintering technology is adopted, the binary alkalinity needs to be controlled to be 1.85 or even more than 1.95, and a large amount of CaO flux still needs to be used, so that the iron grade of the sintered ore is finally low, and the optimization of the technical and economic indexes of the blast furnace is influenced. Theories and practices prove that: the iron grade of the sintered ore entering the blast furnace is reduced by 1 percent, the fuel ratio is increased by 1.5 percent, the yield is reduced by 2.5 percent, the iron slag per ton is increased by 30kg/t, and the coal ratio of the blast furnace is reduced by 15 kg/t.
The prior art is difficult to satisfy the use of high SiO2The technical requirements of producing high-grade high-strength sinter from iron ore generally include high SiO content to control the influence of sinter quality2The mixing proportion of the iron ore is below 3 percent.
In addition, because the alkalinity of the sintered ore is too high, an acid flux such as silica is required to be additionally added in smelting to neutralize the excess CaO so as to meet the requirement of blast furnace slagging, the blast furnace slag ratio is undoubtedly increased, so that the energy consumption of iron making is increased, the stable and smooth operation of furnace conditions is also not facilitated, and the technical and economic indexes of the blast furnace are finally influenced.
Disclosure of Invention
The invention aims to provide a method for manufacturing an ultralow-alkalinity high-strength sintered ore, which mainly solves the problem of using high SiO in the prior art2The invention solves the technical problem that the sintered ore produced by the iron ore has low iron grade, and reduces the production cost of the high-strength sintered ore.
The technical idea of the method is to improve the iron grade of the sinter by reducing the alkalinity of the sinter and improve the SiO in the sinter2The quality content of the sintered ore is reduced to ensure that the sintered ore has good drum strength, and the production technical requirement of the modern blast furnace is met.
The invention adopts the technical scheme that the manufacturing method of the ultra-low alkalinity high-strength sintered ore comprises the following steps:
1) preparing a magnesium flux, crushing dolomite by using a ball mill, and controlling the dolomite with the grain size of less than or equal to 3mm to account for more than 75 percent of the total mass of the dolomite; the dolomite comprises CaCO as the component in percentage by weight3：50-60％，MgCO3: 40-50%, the balance being unavoidable impurities;
2) proportioning, weighing iron ore and magnesium flux, and controlling the binary basicity R of sintered ore21.70-1.80 of SiO in the sintered ore25.0-5.7 wt%, 1.0-1.2 wt% of MgO;
3) mixing and granulating, loading the prepared iron ore and magnesium flux into a mixing roller for primary mixing, adding water during the primary mixing process, stirring, obtaining a primary mixed material, and mixing H in the primary mixed material2The weight percentage of O is 5.9-6.2%; transferring the primary uniformly-mixed material into a secondary uniformly-mixed roller for uniformly mixing and granulating to obtain a secondary uniformly-mixed material;
4) and (4) performing air draft sintering on the secondary mixed material, transferring the secondary mixed material to a sintering trolley for air draft sintering, and obtaining a finished sintered ore after sintering.
The binary basicity R of the sinter produced by the process of the invention21.70-1.80 of SiO in the sintered ore25.0-5.7 wt%, 1.0-1.2 wt% of MgO; TI intensity is more than or equal to 81 percent;
the binary alkalinity R of the sinter of the invention2Is mCaO/mSiO2，mCaOM is the mass of CaO in the sinterSiO2For SiO in sinter2The quality of (c).
The method of the invention is based on the following experimental studies: when sintering SiO in ore blending2When the content is high, a large amount of 2 FeO. SiO is generated in the sintering process2Fayalite and calcium fayalite (CaO)x(FeO)2-xSiO2The silicate binder phase is added, which can obviously increase the drum strength of the sinter; on the other hand, when SiO is in ore blending2At high contents, even if the binary basicity R is controlled to be low2But, however, doThe absolute content of CaO is not low, so that the other main binding phase of calcium ferrite CaO. Fe is generated in the sintering process2O3The generation of the sintered ore can be ensured, which is undoubtedly beneficial to the improvement of the drum strength of the sintered ore; finally, the content of MgO in the sintered ore is controlled to be lower, so that the MgO and the iron oxide can be inhibited from generating magnesium ferrite MgO & Fe2O3Thereby affecting the combination of CaO and iron oxide to reduce the generation amount of calcium ferrite, and magnesium ferrite MgO & Fe2O3The melting temperature of the sintered ore is higher, and a liquid phase is difficult to generate under the condition of a sintering process, so that the control of the MgO content of the sintered ore is also beneficial to improving the drum strength of the sintered ore. Based on the above research mechanism, high SiO2The low alkalinity and the low MgO can ensure that the sintering ore has good drum strength on the premise of improving the grade of the sintering ore as much as possible, and the requirement of modern blast furnace smelting is met.
The method controls the granularity of the MgO flux dolomite to be less than 3mm mostly, which is because the method ensures a certain specific surface area of the flux, improves the efficiency of the contact reaction of CaO in the dolomite and iron oxide in the sintering process, improves the generation condition of calcium ferrite, and improves the generation quantity, thereby improving the strength of the sintered ore.
The method of the invention enlarges the high SiO content2The use ratio of the iron ore in the content is high SiO when producing the sinter2The mass proportion of the iron ore can reach 10-50%, the produced sinter has high drum strength and grade, and can meet 3000m3The requirement of blast furnace smelting.
The high SiO of the invention2Iron ore in the content of SiO2Iron ore with a mass content of more than or equal to 7 percent.
Compared with the prior art, the invention has the following positive effects: 1. the method can effectively improve the iron grade by properly and greatly reducing the alkalinity and MgO in the sintered ore. 2. The method maintains the higher SiO content of the sinter2The content is favorable for 2FeO SiO2Fayalite and calcium fayalite (CaO)x(FeO)2-xSiO2And the generation of silicate binder phase improves the drum strength of the sinter. 3. The method of the inventionHigh-holding sintered ore SiO2Content, i.e. control of lower binary basicity R2But the absolute content of CaO is not low, so that the other main binding phase of calcium ferrite CaO. Fe is generated in the sintering process2O3The formation of (b) can be ensured, which is advantageous for ensuring high drum strength of the sinter. 4. The method of the invention can greatly reduce the MgO content in the sintering ore, reduce the generation of low-strength magnesium ferrite, promote the generation of calcium ferrite, improve the strength of the sintering ore, reduce the alkalinity and SiO2The reduction of (a) has a negative influence on the strength of the sintered ore. 5. The method realizes the use of high SiO2Production of high-strength high-grade sinter from iron ore2The iron ore with the content of more than 7.0 percent is sintered and produced, when the using mass proportion of the iron ore is controlled to be 10-50 percent, the strength and the grade of the sintered ore can also reach higher levels, the requirement of blast furnace smelting is met, the benefit is obvious, the process is simple, and the realization is easy.
Detailed Description
The invention is further described below with reference to specific examples.
Embodiment 1, a method for manufacturing a low-basicity high-strength sintered ore, comprising the steps of:
1) preparing a magnesium flux, crushing dolomite by using a ball mill, and controlling the dolomite with the grain size of less than or equal to 3mm to account for more than 75 percent of the total mass of the dolomite; the dolomite comprises CaCO as the component in percentage by weight3：50-60％，MgCO3: 40-50%, the balance being unavoidable impurities;
2) proportioning, weighing iron ore and magnesium flux, and controlling the binary basicity R of sintered ore21.70, SiO in sinter25.7 percent by weight of MgO, 1.0 percent by weight of MgO;
3) mixing and granulating, loading the prepared iron ore and magnesium flux into a mixing roller for primary mixing, adding water during the primary mixing process, stirring, obtaining a primary mixed material, and mixing H in the primary mixed material2The weight percentage content of O is 6.0 percent; transferring the primary mixed material into a secondary mixing roller for mixingGranulating and obtaining secondary uniform mixture after granulation.
4) And (4) performing air draft sintering on the secondary mixed material, transferring the secondary mixed material to a sintering trolley for air draft sintering, and obtaining a finished sintered ore after sintering.
The quality of the sintered ore of example 1, such as iron grade and strength, is tested, and the quality data of the sintered ore of example 1 are shown in table 1.
Table 1 quality data of sintered ore of example 1 of the present invention
| Categories | Iron grade/% | TI intensity/%) | SiO2/％ | MgO/％ | Binary basicity R2 |
| Example 1 | 58.06 | 82.48 | 5.7 | 1.0 | 1.70 |
| Existing conventional process | 57.5 | 81.45 | 4.96 | 1.65 | 1.93 |
As can be seen from Table 1: the iron grade of the sintered ore produced by the method is increased by more than 0.5 percent, the strength is improved by 1.03 percent, the comprehensive quality is obviously improved, and after the blast furnace is used, the method is favorable for improving the technical and economic indexes of the blast furnace and can create remarkable economic benefit.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (2)
1. A manufacturing method of ultra-low alkalinity high-strength sintered ore is characterized by comprising the following steps:
1) preparing a magnesium flux, crushing dolomite by using a ball mill, and controlling the dolomite with the grain size of less than or equal to 3mm to account for more than 75 percent of the total mass of the dolomite; the dolomite comprises CaCO as the component in percentage by weight3：50-60％，MgCO3: 40-50%, the balance being unavoidable impurities;
2) proportioning, weighing iron ore and magnesium flux, and controlling the binary basicity R of sintered ore21.70-1.80 of SiO in the sintered ore25.0-5.7 wt%, 1.0-1.2 wt% of MgO;
3) mixing and granulating, loading the prepared iron ore and magnesium flux into a mixing roller for primary mixing, adding water during the primary mixing process, stirring, obtaining a primary mixed material, and mixing H in the primary mixed material2The weight percentage of O is 5.9-6.2%; transferring the primary uniformly-mixed material into a secondary uniformly-mixed roller for uniformly mixing and granulating to obtain a secondary uniformly-mixed material;
4) and (4) performing air draft sintering on the secondary mixed material, transferring the secondary mixed material to a sintering trolley for air draft sintering, and obtaining a finished sintered ore after sintering.
2. The method for manufacturing ultra-low alkalinity high-strength sintered ore according to claim 1, wherein the TI strength of the finished sintered ore in the step 4) is not less than 81%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112342372A (en) * | 2020-08-31 | 2021-02-09 | 包头钢铁（集团）有限责任公司 | Method for improving microstructure of sinter |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4511396A (en) * | 1982-09-01 | 1985-04-16 | Nixon Ivor G | Refining of metals |
| RU2266967C1 (en) * | 2004-03-16 | 2005-12-27 | Открытое акционерное общество "Магнитогорский металлургический комбинат" | Method of preparation of fluxes for production of fluxed agglomerate |
| CN1844420A (en) * | 2006-03-14 | 2006-10-11 | 中南大学 | Method for producing sintered mineral with middle and low basicity |
| 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 |
| CN101775451A (en) * | 2010-03-26 | 2010-07-14 | 中南大学 | Blast-furnace smelting method for vanadium titano-magnetite |
| CN102399979A (en) * | 2011-11-10 | 2012-04-04 | 山西太钢不锈钢股份有限公司 | Manufacturing method of low-alkalinity agglomerate |
| CN102586591A (en) * | 2012-03-09 | 2012-07-18 | 中南大学 | Process for producing sintered ore for ironmaking through blast furnace from high-aluminum limonite |
| CN107312899A (en) * | 2017-06-29 | 2017-11-03 | 东北大学 | A kind of blast furnace smelting method of the high vanadium v-ti magnetite concentrate containing chromium type of high-grade |
-
2018
- 2018-06-25 CN CN201810662955.1A patent/CN110629019A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4511396A (en) * | 1982-09-01 | 1985-04-16 | Nixon Ivor G | Refining of metals |
| RU2266967C1 (en) * | 2004-03-16 | 2005-12-27 | Открытое акционерное общество "Магнитогорский металлургический комбинат" | Method of preparation of fluxes for production of fluxed agglomerate |
| CN1844420A (en) * | 2006-03-14 | 2006-10-11 | 中南大学 | Method for producing sintered mineral with middle and low basicity |
| 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 |
| CN101775451A (en) * | 2010-03-26 | 2010-07-14 | 中南大学 | Blast-furnace smelting method for vanadium titano-magnetite |
| CN102399979A (en) * | 2011-11-10 | 2012-04-04 | 山西太钢不锈钢股份有限公司 | Manufacturing method of low-alkalinity agglomerate |
| CN102586591A (en) * | 2012-03-09 | 2012-07-18 | 中南大学 | Process for producing sintered ore for ironmaking through blast furnace from high-aluminum limonite |
| CN107312899A (en) * | 2017-06-29 | 2017-11-03 | 东北大学 | A kind of blast furnace smelting method of the high vanadium v-ti magnetite concentrate containing chromium type of high-grade |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112342372A (en) * | 2020-08-31 | 2021-02-09 | 包头钢铁（集团）有限责任公司 | Method for improving microstructure of sinter |
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