CN101519720A - Method for preparing high titania type high MgO sintering ore - Google Patents
Method for preparing high titania type high MgO sintering ore Download PDFInfo
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Abstract
The invention belongs to the field of metallurgy of iron and steel, particularly relates to a method for preparing high titania type high MgO sintering ore, aiming to provide a method capable of improving the drum strength of high sintering ore. The method comprises the steps of dosing, mixing material for pellet fabrication, distributing material, igniting and sintering. The high titania type high MgO sinter ore comprises the following ingredients by weight: 48-52 percent of Panzhihua high titania type vanadium-titania magnet ore concentrate, 12-16 percent of Australian ore powder, 7.5-11.5 percent of strong flour, 3.5-5.5 percent of sieving powder, 1-3 percent of gas ash, 1-3 percent of steel slag, 4.3-4.7 percent of coke powder, 3.2-5.5 percent of lime stone, and 2.3-3.8 percent of dolomite. Adding dolomite into the sintering mixture can improve the intensity of the sintering ore and the ratio of finished products, improves the performance of sintering ore metallurgy and the performance of blast furnace slag, achieves the aim of improving sintering and blast furnace smelting technical and economical index, and reduces energy consumption of fuel. The method is simple and easy to operate, and highly flexible by only regulating the structure of sintering materials without altering the field process.
Description
Technical field
The invention belongs to the ferrous metallurgy field, be specifically related to high titania type high MgO sintering ore the preparation method.
Background technology
Panzhihua Inon ﹠ Steel's sintering iron-bearing material is mainly Flos Bombacis Malabarici high-Ti type V-Ti magnetite concentrate (accounting for more than 60% of iron-bearing material consumption), and this ore deposit has TiO
2Content height (12%-13%), Al
2O
3High, SiO
2Low, coarse size (0.074mm grain size content only about 50%, and common iron ore concentrate-0.074mm grain size content is general all more than 80%), size composition unreasonable (grain size content is many in the middle of the 0.25mm～0.074mm that is unfavorable for granulating), characteristics such as wetting ability difference belong to the mineral of special hard-to-sinter.Contain more brittle uhligite (CaOTiO in the agglomerate
2), thereby the intensity difference of agglomerate, yield rate is low, the rate of return mine is high.Simultaneously, owing to TiO in blast furnace ironmaking process
2Cross reduction, special difficult problems such as dry slag, the difficult branch of slag iron, iron loss height have been produced, though climb the technical measures that adopted many intensified-sintered and blast-furnace smeltinges since steel is gone into operation, but because Flos Bombacis Malabarici high-titanium type vanadium-titanium magnetite inherent singularity, the effect that obtains is comparatively limited, this is to climb steel vanadium titanium agglomerate yield and quality for a long time to lag behind the ordinary sinter ore deposit always, and the big major cause of blast-furnace smelting difficulty, is to climb " bottleneck " that steel is produced.Therefore, capturing high-titanium type vanadium-titanium magnetite sintering and blast furnace smelting technology difficulty is to improve to climb one of key link of the whole Iron and Steel Production of steel.
The invention human desires is adjusted to improve the barrate strength of agglomerate existing preparation technology.
Summary of the invention
Technical problem solved by the invention provides a kind of preparation method of high titania type high MgO sintering ore, the preparation of this method and agglomerate can improve barrate strength.
This preparation method comprises the steps: that batching → compound makes ball → cloth → igniting sintering, it is characterized in that: ingredients by weight is than adding powder 3.5-5.5%, gas ash 1-3%, slag 1-3%, coke powder 4.3-4.7%, Wingdale 3.2-5.5%, rhombspar 2.3-3.8% for Flos Bombacis Malabarici high-Ti type V-Ti magnetite concentrate 48-52%, Australia breeze 12-16%, domestic product higher-grade breeze 7.5-11.5%, sieve.
Need in advance rhombspar to be broken for granularity during batching less than 3mm.In the past because both at home and abroad at common ore deposit sintering during with addition of rhombspar, because the hardness of rhombspar is bigger, broken difficulty, therefore granularity is thicker, and wherein〉the 3mm grain size content is more, because the fusing point of rhombspar is higher, the reactivity of MgO than CaO a little less than, in sintering process, be difficult for the fusing reaction during coarse size, influence its salinity, cause the agglomerate output and quality to descend.The present invention adopts the fine grinding method, rhombspar is crushed to granularity less than 3mm, because thinner rhombspar is more evenly distributed in compound, easier fusing under the identical temperature condition, improved its mineralising level of response, free MgO reduces, and helps improving the mineral composition and the structure of agglomerate, thereby improves its barrate strength and metallurgical performance.The rhombspar of contriver's practical application be climb the steel limestone mine produce the minus mesh of high magnesium lime (＜40mm), in the past because this part rhombspar granularity was little, the foreign matter content height, use value is low, is at present to stack as waste to throw aside, and is not used, both land occupation, contaminate environment again.
The contriver is at the characteristics of Flos Bombacis Malabarici high-Ti type V-Ti magnetite concentrate, high-titanium type vanadium-titanium magnetite sintering and blast-furnace smelting MgO content have suitably been improved, the result shows, adopting with addition of climbing the alternative part Wingdale of steel limestone mine depleted rhombspar, add the rhombspar of 2.3%～3.8% weight ratio, the Wingdale of 3.2%～4.7% weight ratio in the batching, corresponding agglomerate MgO content is 2.7%～3.2%, and blast furnace slag MgO content is that the effect of smelting in 8.25%～9.28% o'clock is best.In this scope, along with rhombspar proportioning (MgO content) improves, the technico-economical comparison of sintering and blast-furnace smelting improves gradually; Be below or above this scope, then sinter quality and blast-furnace smelting index obviously descend.Therefore, this scope is the optimum processing parameter of high titania type high MgO sintering ore.And adopt with addition of the mode of climbing the alternative part Wingdale of steel limestone mine depleted rhombspar, can improve the technico-economical comparison of sintering and blast-furnace smelting on the one hand, made full use of refuse on the other hand again, help environment protection, kill two birds with one stone.
The beneficial effect of the inventive method:
(1) after employing the inventive method, the magnesium magnetite that contains stable in the agglomerate increases, and variation has taken place in silicate bonding mutually, magnesia silicate minerals (merwinite, forsterite) content increases, help improving sintered ore rotary drum strength and yield rate, wherein, barrate strength can improve 0.41%～1.25%, yield rate can improve 0.28%～1.05%, and output improves 0.01～0.026%.
(2) after employing the inventive method, the CaO white point reduces in the agglomerate, and the solid solution of MgO energy is in β-2CaOSiO
2In, the β of stablizing-2CaOSiO is arranged
2Effect, stop its crystal phase transition, thereby help reducing the storage Pulverization ratio of agglomerate.
(3) after employing the inventive method,, can improve the metallurgical performance of agglomerate because agglomerate mineral composition and structure are improved.
(4) after employing the inventive method, can significantly improve the blast furnace slag performance, reduce iron loss and coke ratio, improve the technico-economical comparison of blast-furnace smelting, particularly, the blast-furnace smelting iron loss reduces by 1.44%～1.96%, coke ratio decline 3.87～6.57kg/tp.
Embodiment
Below by specific description of embodiments of the present invention the explanation but do not limit the present invention.
The raw material that the contriver was used to prepare agglomerate in the past is Flos Bombacis Malabarici sefstromite concentrate, common powdered iron ore (the Australian breeze of import, domestic product higher-grade breeze, sieve add powder, gas ash), flux (Wingdale, unslaked lime), fuel (coke powder, clean fine coal) etc., above raw material is after the sintered material chamber is prepared by a certain percentage by disk feeder, by belt be transported to add water in the drum mixer and mix, granulate after, be transported to material distributing machine cloth again to pallet, sintering is carried out in igniting then.It is as follows to prepare burden: Flos Bombacis Malabarici high-Ti type V-Ti magnetite concentrate 48-52%, Australia breeze 12-16%, domestic product higher-grade breeze 7.5-11.5%, sieve add powder 3.5-5.5%, gas ash 1-3%, slag 1-3%, coke powder 4.3-4.7%, Wingdale 3.2-5.5%, join the 30-40% that returns mine outward, wherein MgO content 2.2-2.5%.
When smelting common ore deposit, carry out overtesting research both at home and abroad, can adopt with addition of serpentine, wagnerite, rhombspar etc. to contain the MgO raw material.The result shows, the effect of MgO when smelting reaches with material condition has very big relation with addition of mode.Because kind, the component difference of raw materials such as each factory's iron ore, MgO mineral are bigger, it is different to the size and the rule of sintering performance influence to improve MgO, suitable MgO value is also different, and the different MgO raw materials that contains reaches also different with addition of the effect of its effect of mode.The contriver has determined to adopt the component concentration in the inventive method to be used to prepare agglomerate by craft screening and component screening, improves the adjustment that only relates to the raw materials for sintering structure, need not transform on-the-spot technical process, and feasibility is strong.
Below by original raw material mix and raw material mix of the present invention compare with the explanation the inventive method beneficial effect.
Make ball → cloth → igniting agglomerating processing step according to batching → compound and carry out sintering, sintered material is as follows:
1 base period of embodiment (not with addition of rhombspar, i.e. original production process) batching:
Flos Bombacis Malabarici high-Ti type V-Ti magnetite concentrate 50%, Australia's breeze 14%, domestic product higher-grade breeze 10.5%, sieve add powder 4.5%, gas ash 2%, slag 2%, coke powder 4.5% Wingdale 5.5%, join outward and return mine 35%.Wherein MgO content 2.5%.
Embodiment 2 technology batchings of the present invention:
Flos Bombacis Malabarici high-Ti type V-Ti magnetite concentrate 50%, Australia's breeze 14%, domestic product higher-grade breeze 9%, sieve add powder 4.5%, gas ash 2%, slag 2%, coke powder 4.5% Wingdale 4.7%, rhombspar 2.3%, join outward and return mine 35%.Wherein MgO content 2.7%.
Embodiment 3 technology batchings of the present invention:
Flos Bombacis Malabarici high-Ti type V-Ti magnetite concentrate 50%, Australia's breeze 14%, domestic product higher-grade breeze 9%, sieve add powder 4.5%, gas ash 2%, slag 2%, coke powder 4.5% Wingdale 4.0%, rhombspar 3.0%, join outward and return mine 35%.Wherein MgO content 2.9%.
Embodiment 4 technology batchings of the present invention:
Flos Bombacis Malabarici high-Ti type V-Ti magnetite concentrate 50%, Australia's breeze 14%, domestic product higher-grade breeze 9%, sieve add powder 4.5%, gas ash 2%, slag 2%, coke powder 4.5% Wingdale 3.2%, rhombspar 3.8%, join outward and return mine 35%.Wherein MgO content 3.2%.
Illustrate: the Australia ore deposit-be Australian breeze, be called for short the Australia ore deposit, be the import rich ore powder, iron divides higher (about TFe62%).
Domestic product higher-grade breeze: promptly domestic product higher-grade rich ore powder, be called for short the high powder of state, iron divides higher (about TFe59%-60%).
Sieve adds powder: i.e. the fine ore of the undersized granule level of lump ore ore deposit after processing treatment, and be called for short sieve and add powder, iron divides medium ((about TFe48%).
Gas ash: i.e. blast furnace gravitational dust collection ash, because air-flow is mainly blast furnace gas in the cleaning shaft, and blast furnace gas is for containing poisonous flammable explosive gas such as CO, so abbreviate gas ash again as, i.e. the ash taken out of of methane gas.Sintering is mainly refuse reclamation with addition of the purpose of gas ash.
Slag: the i.e. converter slag of STEELMAKING PRODUCTION.Sintering is mainly refuse reclamation with addition of the purpose of slag, and sinter quality is had some improvement.
Return mine: i.e. the fine fraction ore deposit that produces in fragmentation, transportation, storage process of agglomerate is generally＜5mm.Sintering sintering is again returned in this part ore deposit again after sieving down, return mine so be called.
Respectively with technology batching (embodiment 2-4) gained agglomerate of the present invention and base period (embodiment 1) contrast:
Embodiment 2 gained agglomerate and blast furnace slag MgO content improve 0.2 and 0.75 percentage point respectively, sintered ore rotary drum strength improves 0.41 percentage point, yield rate improves 0.28 percentage point, and output improves 0.01%, and the agglomerate low temperature reduction degradation index descends 0.43 percentage point; Blast furnace slag viscosity degradation 0.12Pas, melting temperature descends 8 ℃, and sweetening power (Ls) improves 0.92, and iron loss reduces by 1.44 percentage points, coke ratio decline 3.87kg/tp.
Embodiment 3 gained agglomerate and blast furnace slag MgO content improve 0.4 and 1.23 percentage point respectively, sintered ore rotary drum strength improves 0.87 percentage point, yield rate improves 0.76 percentage point, and output improves 0.02%, and the agglomerate low temperature reduction degradation index descends 1.78 percentage points; Blast furnace slag viscosity degradation 0.18Pas, melting temperature descends 13 ℃, and sweetening power (Ls) improves 1.31, and iron loss reduces by 1.71 percentage points, coke ratio decline 4.52kg/tp.
Embodiment 4 agglomerate and blast furnace slag MgO content improve 0.7 and 1.78 percentage point respectively, sintered ore rotary drum strength improves 1.25 percentage points, yield rate improves 1.05 percentage points, and output improves 0.026%, and the agglomerate low temperature reduction degradation index descends 2.4 percentage points; Blast furnace slag viscosity degradation 0.22Pas, melting temperature descends 17 ℃, and sweetening power (Ls) improves 1.85, and iron loss reduces by 1.96 percentage points, coke ratio decline 6.57kg/tp.
To sum up, employing can improve MgO content in agglomerate and the blast furnace slag with addition of rhombspar in sinter mixture, improve sinter strength, yield rate thereby reach, improve agglomerate metallurgical performance and blast furnace slag performance, improve the purpose of sintering and blast furnace smelting technology economic target; Make sintering mineral products, quality and blast-furnace smelting index improve a lot, and blast furnace fuel consumption descend.The inventive method is simple, only relates to the adjustment of raw materials for sintering structure, need not transform on-the-spot technical process, and feasibility is strong.
Claims (6)
- The preparation method of [claim 1] high titania type high MgO sintering ore, comprise the steps: that batching → compound makes ball → cloth → igniting sintering, it is characterized in that: ingredients by weight is than adding powder 3.5-5.5%, gas ash 1-3%, slag 1-3%, coke powder 4.3-4.7%, Wingdale 3.2-5.5%, rhombspar 2.3-3.8% for Flos Bombacis Malabarici high-Ti type V-Ti magnetite concentrate 48-52%, Australia breeze 12-16%, the high powder 7.5-11.5% of state, sieve.
- The preparation method of [claim 2] high titania type high MgO sintering ore according to claim 1 is characterized in that: ingredients by weight is than adding powder 4.5%, gas ash 2%, slag 2%, coke powder 4.5%, rhombspar 2.3%～3.8%, Wingdale 3.2%～4.7% for Flos Bombacis Malabarici high-Ti type V-Ti magnetite concentrate 50%, Australia's breeze 14%, the high powder 9% of state, sieve.
- The preparation method of [claim 3] high titania type high MgO sintering ore according to claim 2 is characterized in that: ingredients by weight is than adding powder 4.5%, gas ash 2%, slag 2%, coke powder 4.5%, rhombspar 2.3%, Wingdale 4.7% for Flos Bombacis Malabarici high-Ti type V-Ti magnetite concentrate 50%, Australia's breeze 14%, the high powder 9% of state, sieve.
- The preparation method of [claim 4] high titania type high MgO sintering ore according to claim 2 is characterized in that: ingredients by weight is than adding powder 4.5%, gas ash 2%, slag 2%, coke powder 4.5%, rhombspar 3.0%, Wingdale 4.2% for Flos Bombacis Malabarici high-Ti type V-Ti magnetite concentrate 50%, Australia's breeze 14%, the high powder 9% of state, sieve.
- The preparation method of [claim 5] high titania type high MgO sintering ore according to claim 2 is characterized in that: ingredients by weight is than adding powder 4.5%, gas ash 2%, slag 2%, coke powder 4.5%, rhombspar 3.8%, Wingdale 3.2% for Flos Bombacis Malabarici high-Ti type V-Ti magnetite concentrate 50%, Australia's breeze 14%, the high powder 9% of state, sieve.
- [claim 6] is characterized in that according to the preparation method of each described high titania type high MgO sintering ore of claim 1-5: need in advance rhombspar to be broken for the granularity less than 3mm during batching.
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| CN101857911A (en) * | 2010-07-16 | 2010-10-13 | 四川省达州钢铁集团有限责任公司 | Method for steelmaking by using converter |
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| CN103243216A (en) * | 2013-05-24 | 2013-08-14 | 攀钢集团攀枝花钢铁研究院有限公司 | Sintering ore and production method thereof |
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| CN101857911A (en) * | 2010-07-16 | 2010-10-13 | 四川省达州钢铁集团有限责任公司 | Method for steelmaking by using converter |
| CN102978384A (en) * | 2012-12-24 | 2013-03-20 | 首钢总公司 | Method for using steel slags during sintering |
| CN102978384B (en) * | 2012-12-24 | 2015-01-21 | 首钢总公司 | Method for using steel slags during sintering |
| CN103243216A (en) * | 2013-05-24 | 2013-08-14 | 攀钢集团攀枝花钢铁研究院有限公司 | Sintering ore and production method thereof |
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| CN104480299A (en) * | 2015-01-14 | 2015-04-01 | 东北大学 | Method for preparing sintered ores by adding waste slag to chromium-containing-type vanadium-titanium magnetite concentrates |
| CN104480299B (en) * | 2015-01-14 | 2017-04-12 | 东北大学 | Method for preparing sintered ores by adding waste slag to chromium-containing-type vanadium-titanium magnetite concentrates |
| CN105603181A (en) * | 2016-02-02 | 2016-05-25 | 四川德胜集团钒钛有限公司 | Method for sintering schreyerite by utilizing steel slag |
| CN109439893A (en) * | 2018-11-20 | 2019-03-08 | 广东广青金属科技有限公司 | Stainless steel slag blast furnace sinter method |
| CN110229938A (en) * | 2019-07-05 | 2019-09-13 | 新疆昆玉钢铁有限公司 | A kind of sintering method under the conditions of special material |
| US20210017035A1 (en) * | 2019-07-21 | 2021-01-21 | Arelac, Inc. | Methods and systems for utilizing calcium compound from calcined limestone |
| US11939227B2 (en) * | 2019-07-21 | 2024-03-26 | Arelac, Inc. | Methods and systems for utilizing calcium compound from calcined limestone |
| US11697598B2 (en) | 2020-02-25 | 2023-07-11 | Arelac, Inc. | Methods and systems for treatment of limestone to form vaterite |
| CN112342373A (en) * | 2020-09-22 | 2021-02-09 | 包头钢铁（集团）有限责任公司 | High-quality low-silicon-content sinter prepared from low-silicon iron concentrate containing fluorine, potassium and sodium and preparation method thereof |
| CN112553388A (en) * | 2020-11-23 | 2021-03-26 | 攀钢集团攀枝花钢铁研究院有限公司 | Furnace charge of high-grade vanadium titano-magnetite and smelting method |
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