CN102409170A - High-mechanical strength carbon-containing pellets for blast furnace and production method for high-mechanical strength carbon-containing pellets - Google Patents
High-mechanical strength carbon-containing pellets for blast furnace and production method for high-mechanical strength carbon-containing pellets Download PDFInfo
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- CN102409170A CN102409170A CN2010102914112A CN201010291411A CN102409170A CN 102409170 A CN102409170 A CN 102409170A CN 2010102914112 A CN2010102914112 A CN 2010102914112A CN 201010291411 A CN201010291411 A CN 201010291411A CN 102409170 A CN102409170 A CN 102409170A
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Abstract
The invention discloses high-mechanical strength carbon-containing pellets for a blast furnace. The pellets comprise the following raw materials in percentage by weight: 80 to 92 percent of magnetite concentrate, 1 to 2 percent of bentonite, 2 to 12 percent of coal dust, 2 to 14 percent of magnesium rock flour and 0.4 to 0.6 percent of MgO/SiO2 which is controlled in the raw materials. The production method for the pellets comprises the following steps of: weighing 80 to 92 percent of magnetite concentrate, 2 to 12 percent of coal dust, 1 to 2 percent of bentonite and 2 to 14 percent of magnesium rock flour according to a proportion and batching to ensure that 0.4 to 0.6 percent of MgO/SiO2 is contained in the mixed materials; spraying water, uniformly mixing, controlling the water content of the mixed materials to be 8 to 9 percent, and steaming for 30 to 60 minutes; preparing green pellets by using a pelletizing machine, screening the green pellets, and thus obtaining qualified screen pellets with the particle size of 9 to 16mm; and roasting at the temperature of between 1,250 and 1,300 DEG C for 10 to 15 minutes, and thus obtaining finished pellets with higher strength. By the method, the strength of the carbon-containing pellets is improved, the carbon-containing pellets with a certain metallization rate are obtained, and extremely high value for energy conservation and consumption reduction of the blast furnace is realized.
Description
Technical field
The invention belongs to iron-smelting raw material pellet agglomeration technology field, particularly a kind of with coal dust and contain MgO material produce blast furnace with high mechanical strength carbonaceous pelletizing and working method thereof.
Background technology
Carbonaceous pelletizing be a kind of self with addition of the pellet of certain content carbonaceous reductant, compare with traditional pelletizing, carbonaceous pelletizing can enlarge the reaction between carbon and oxygen interface; Reduce the diffusion of gas at the solid state reaction interface, himself carbon oxygen directly contacts simultaneously, and gas is got rid of from inside to outside; The oxygenizement that has suppressed oxidizing gas; So one of effective means that the carbonaceous pelletizing production application is a smelter reduces coke ratio, existing research show that the degree of metalization that gets into the blast furnace iron ore improves 1%; Coke ratio reduces 4-5%, therefore receives much concern at steel industry.
Carbonaceous pelletizing generally is used for non-blast-furnace smelting, and one Chinese patent application numbers 200510134295.2 has been announced " composite carbon containing pellet ", it is characterized in that: carbonaceous material 40-80%; MOX 10-42%, rare earth oxide 5-30%, sticker 2-10%; Toughener 1-5%, swelling agent 1-5%, steel processing smear metal 1-4%; Products obtained therefrom drops in the molten steel and uses, but carburetting can reduce and is mingled with.
It is also comparatively common to adopt the pressure ball mode to produce carbonaceous pelletizing, like one Chinese patent application number 200510117645.4 " method of manufacture of composite carbon containing pellet and devices thereof " and application number 94103910.2 " alkalescence, carbon containing, flue dust powder cooled agglomerated pellet ".The ball method of making that adopts in the said patent is the pressure ball mode.
Adopt traditional disk pellet forming process also to have related; People's such as Wu Bin research shows; In blending ratio is under the situation of 13.1%-20.83%, with powdered iron ore, coal dust and sticker uniform mixing, adopts balling disc to prepare green-ball then; And 1100 ℃ of roastings, finally having obtained maximum intensity is the individual finished ball of 293N/.
Mainly there is following problem in the carbonaceous pelletizing working method of the above: 1. the add-on of carbon materials is high, and the carbonaceous pelletizing effect of being produced is similar to metallized pellet, is inappropriate for blast furnace; 2. be on the production technique of non-traditional pelletizing, to produce preparation, increase production cost; 3. adopt traditional technology production, finished ball intensity is lower, can not satisfy the blast furnace requirement.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the objective of the invention is to adopt the method for adding MgO, with lower coal dust addition; Through traditional disk pellet forming process; Production has the carbonaceous pelletizing of certain intensity and degree of metalization, finally in blast furnace, uses, thereby reaches energy-saving and cost-reducing purpose.
Main contents of the present invention are following:
A kind of blast furnace is used the high mechanical strength carbonaceous pelletizing, it is characterized in that, raw material is formed weight percent content and is: magnetite concentrate 80-92%, wilkinite 1-2%, coal dust 2-12%, magnesite powder 2-14%, MgO/SiO in the control raw material
2Be 0.4-0.6.
The chemical ingredients of magnetite concentrate is by weight percentage: TFe 65-69%, FeO 20-31%, SiO
24-7%, CaO 0.01-1%, MgO 0.01-0.5%, Al
2O
30.01-0.5%.
Bentonitic chemical component weight per-cent is: SiO
268-75%, CaO 0.01-4%, MgO 4-14%, Al
2O
312-17%.
The magnesite powder comprises in magnesite stone flour, light-burning magnesium powder, the MgO efflorescence reagent any or several kinds of combinations.
The chemical component weight per-cent of magnesite stone flour and light-burning magnesium powder is SiO
22-5%, CaO2-5%,, MgO 80-95%, Al
2O
30.01-11%.
MgO in the MgO chemically pure reagent＞98%.
Magnesite powder footpath＜0.074mm greater than 90%.
The chemical component weight per-cent of coal dust is: fixed carbon 50-73%, ash content 9-15%, fugitive constituent 15-40%.
A kind of blast furnace is characterized by with the working method of high mechanical strength carbonaceous pelletizing: with magnetite concentrate 80-92%, coal dust 2-12%, wilkinite 1-2% and magnesite powder 2-14% weighing and burden in proportion, and guarantee MgO/SiO in the compound
2Be 0.4-0.6, the water spray mixing is also controlled mixture moisture 8-9%, shelving 30-60 minute; Adopt pelletizer to prepare green-ball then; Green-ball sieve the qualified green-ball of 9-16mm, carry out roasting subsequently, the control maturing temperature is 1250 ℃-1300 ℃; Roasting time 10-15 minute, the final finished ball that obtains to have higher-strength.
Adopt the present invention,, improved carbonaceous pelletizing ore deposit intensity, obtained to have the carbonaceous pelletizing of certain degree of metalization, have very big value for the energy Conservation of Blast Furnace consumption reduction not increasing any facility investment and not changing under the condition of original technology basically.Through check, the finished product low-carbon (LC) magnesium-containing pellets of roasting gained, its physical strength can reach the 1500N/ ball, and degree of metalization can reach about 30%, uses like blast furnace, can reduce coke ratio, energy efficient greatly.
Embodiment
Describe below in conjunction with specific embodiment:
Raw material composition, chemical ingredients and proportioning among table 1 embodiment.
Embodiment 1
Proportioning by table 1 provides is weighed and tentatively dried mixed 10min; It is wetting to spray water then; Make mixture moisture be controlled at 8.1%; Balling disc at
behind shelving 30min prepares green-ball; The gained green-ball carries out roasting at belt machine, 1250 ℃ of maturing temperatures then through the qualified green-ball that screening obtains
; Roasting time 12min obtains finished ball at last.
Embodiment 2
Proportioning by table 1 provides is weighed and tentatively dried mixed 15min; It is wetting to spray water then; Make mixture moisture be controlled at 8.5%; Balling disc at
behind shelving 60min prepares green-ball; The qualified green-ball that the gained green-ball obtains
through screening; In chain grate machine-rotary kiln, carry out roasting then; 1280 ℃ of maturing temperatures, roasting time 10min obtains finished ball at last.
Embodiment 3
Proportioning by table 1 provides is weighed and tentatively dried mixed 15min; It is wetting to spray water then; Make mixture moisture be controlled at 9%; Balling disc at
behind shelving 60min prepares green-ball; The qualified green-ball that the gained green-ball obtains
through screening; In chain grate machine-rotary kiln, carry out roasting then; 1300 ℃ of maturing temperatures, roasting time 13min obtains finished ball at last.
Embodiment 4
Proportioning by table 1 provides is weighed and tentatively dried mixed 15min; It is wetting to spray water then; Make mixture moisture be controlled at 8.3%; Balling disc at
behind shelving 60min prepares green-ball; The qualified green-ball that the gained green-ball obtains
through screening; In chain grate machine-rotary kiln, carry out roasting then; 1280 ℃ of maturing temperatures, roasting time 11min obtains finished ball at last.
Embodiment 5
Proportioning by table 1 provides is weighed and tentatively dried mixed 13min; It is wetting to spray water then; Make mixture moisture be controlled at 8.3%; Balling disc at
behind shelving 60min prepares green-ball; The gained green-ball carries out roasting, 1280 ℃ of maturing temperatures then through the qualified green-ball that screening obtains
in belt machine; Roasting time 15min obtains finished ball at last.
Embodiment 6
Proportioning by table 1 provides is weighed and tentatively dried mixed 13min; It is wetting to spray water then; Make mixture moisture be controlled at 8.3%; Balling disc at
behind shelving 60min prepares green-ball; The gained green-ball carries out roasting, 1300 ℃ of maturing temperatures then through the qualified green-ball that screening obtains
in belt machine; Roasting time 14min obtains finished ball at last.
Embodiment 7
Proportioning by table 1 provides is weighed and tentatively dried mixed 15min, and it is wetting to spray water then, makes mixture moisture be controlled at 8.3%; Adopt the pair roller ball press to prepare green-ball subsequently, the gained green-ball carries out roasting in belt machine, 1300 ℃ of maturing temperatures; Roasting time 12min obtains finished ball at last.
Comparative Examples
Proportioning by table 1 provides is weighed and tentatively dried mixed 13min; It is wetting to spray water then; Make mixture moisture be controlled at 8.4%; Balling disc at
behind shelving 60min prepares green-ball; The gained green-ball carries out roasting, 1250 ℃ of maturing temperatures then through the qualified green-ball that screening obtains
in belt machine; Roasting time 12min obtains finished ball at last.
Table 2 embodiment effect
| Embodiment | Intensity N/ ball | Degree of metalization % |
| Embodiment 1 | 1539 | 23.97 |
| Embodiment 2 | 1630 | 20.70 |
| Embodiment 3 | 2138 | 20.18 |
| Embodiment 4 | 1743 | 22.88 |
| Embodiment 5 | 1842 | 24.28 |
| Embodiment 6 | 1519 | 29.31 |
| Embodiment 7 | 1732 | 32.48 |
| Comparative Examples | 806 | 13.9 |
From above embodiment, can find out, at MgO/SiO
2In the 0.4-0.6 scope, adopt common pellet forming process can prepare and produce the carbonaceous pelletizing that intensity surpasses the 1500N/ ball, and the pelletizing degree of metalization reach as high as 32.48%; Adopt this process means; Can not change under the traditional technology condition, prepare the high quality carbonaceous pelletizing that satisfies the blast furnace demand, if blast furnace uses; Can reduce coke ratio, have important economic implications.
Claims (9)
1. a blast furnace is used the high mechanical strength carbonaceous pelletizing, it is characterized in that: raw material is formed weight percent content and is: magnetite concentrate 80-92%, wilkinite 1-2%, coal dust 2-12%, magnesite powder 2-14%, MgO/SiO in the control raw material
2Be 0.4-0.6.
2. blast furnace according to claim 1 is used the high mechanical strength carbonaceous pelletizing, it is characterized in that: the chemical ingredients of described magnetite concentrate is by weight percentage: TFe 65-69%, FeO20-31%, SiO
24-7%, CaO 0.01-1%, MgO 0.01-0.5%, Al
2O
30.01-0.5%.
3. blast furnace according to claim 1 is used the high mechanical strength carbonaceous pelletizing, it is characterized in that: described bentonitic chemical component weight per-cent is: SiO
268-75%, CaO0.01-4%, MgO 4-14%, Al
2O
312-17%.
4. blast furnace according to claim 1 is used the high mechanical strength carbonaceous pelletizing, it is characterized in that: described magnesite powder comprises in magnesite stone flour, light-burning magnesium powder, the MgO efflorescence reagent any or several kinds of combinations.
5. blast furnace according to claim 1 is used the high mechanical strength carbonaceous pelletizing, it is characterized in that: the chemical component weight per-cent of described coal dust is: fixed carbon 50-73%, ash content 9-15%, fugitive constituent 15-40%.
6. blast furnace according to claim 1 is used the high mechanical strength carbonaceous pelletizing, it is characterized in that: described magnesite powder footpath＜0.074mm greater than 90%.
7. blast furnace according to claim 4 is used the high mechanical strength carbonaceous pelletizing, it is characterized in that: the chemical component weight per-cent of described magnesite stone flour and light-burning magnesium powder is SiO
22-5%, CaO 2-5%,, MgO 80-95%, Al
2O
30.01-11%.
8. blast furnace according to claim 4 is used the high mechanical strength carbonaceous pelletizing, it is characterized in that: MgO＞98% in the described MgO chemically pure reagent.
9. one kind requires the working method of 1 said blast furnace with the high mechanical strength carbonaceous pelletizing according to profit; It is characterized in that:, and guarantee MgO/SiO in the compound magnetite concentrate 80-92%, coal dust 2-12%, wilkinite 1-2% and magnesite powder 2-14% weighing and burden in proportion
2Be 0.4-0.6, the water spray mixing is also controlled mixture moisture 8-9%, shelving 30-60 minute; Adopt pelletizer to prepare green-ball then; Green-ball sieve the qualified green-ball of 9-16mm, carry out roasting subsequently, the control maturing temperature is 1250 ℃-1300 ℃; Roasting time 10-15 minute, the final finished ball that obtains to have higher-strength.
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|---|---|---|---|
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102912119A (en) * | 2012-10-23 | 2013-02-06 | 鞍钢股份有限公司 | Method for preventing self-fluxed pellets from bonding in roasting |
| CN103468838A (en) * | 2013-08-23 | 2013-12-25 | 安阳钢铁股份有限公司 | Blast furnace ironmaking technology adopting high pellet ore proportion |
| CN103509938A (en) * | 2012-06-20 | 2014-01-15 | 鞍钢股份有限公司 | Method for preventing excessive fusion of prereduced sinter |
| CN103509940A (en) * | 2012-06-20 | 2014-01-15 | 鞍钢股份有限公司 | Carbon containing pellet for producing low-sulfur grained iron |
| CN107083461A (en) * | 2012-12-07 | 2017-08-22 | 新日铁住金工程技术株式会社 | The operating method of blast furnace and the manufacture method of molten iron |
| CN110229960A (en) * | 2019-07-02 | 2019-09-13 | 中南大学 | A kind of method that coarse grain iron-stone prepares magnesium-containing pellets |
| CN112159896A (en) * | 2020-09-27 | 2021-01-01 | 酒泉钢铁(集团)有限责任公司 | High-magnesium internal combustion acid pellet ore |
| CN113817918A (en) * | 2021-08-05 | 2021-12-21 | 包头钢铁（集团）有限责任公司 | Method for improving reduction expansion of high-alkali metal and high-F content pellet ore |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103509940B (en) * | 2012-06-20 | 2015-04-08 | 鞍钢股份有限公司 | Carbon containing pellet for producing low-sulfur grained iron |
| CN103509938A (en) * | 2012-06-20 | 2014-01-15 | 鞍钢股份有限公司 | Method for preventing excessive fusion of prereduced sinter |
| CN103509940A (en) * | 2012-06-20 | 2014-01-15 | 鞍钢股份有限公司 | Carbon containing pellet for producing low-sulfur grained iron |
| CN103509938B (en) * | 2012-06-20 | 2015-04-08 | 鞍钢股份有限公司 | Method for preventing excessive fusion of prereduced sinter |
| CN102912119A (en) * | 2012-10-23 | 2013-02-06 | 鞍钢股份有限公司 | Method for preventing self-fluxed pellets from bonding in roasting |
| CN102912119B (en) * | 2012-10-23 | 2015-04-08 | 鞍钢股份有限公司 | Method for preventing self-fluxed pellets from bonding in roasting |
| CN107083461A (en) * | 2012-12-07 | 2017-08-22 | 新日铁住金工程技术株式会社 | The operating method of blast furnace and the manufacture method of molten iron |
| CN107083461B (en) * | 2012-12-07 | 2019-05-10 | 新日铁住金工程技术株式会社 | The operating method of blast furnace and the manufacturing method of molten iron |
| CN103468838A (en) * | 2013-08-23 | 2013-12-25 | 安阳钢铁股份有限公司 | Blast furnace ironmaking technology adopting high pellet ore proportion |
| CN103468838B (en) * | 2013-08-23 | 2015-02-25 | 安阳钢铁股份有限公司 | Blast furnace ironmaking technology adopting high pellet ore proportion |
| CN110229960A (en) * | 2019-07-02 | 2019-09-13 | 中南大学 | A kind of method that coarse grain iron-stone prepares magnesium-containing pellets |
| CN112159896A (en) * | 2020-09-27 | 2021-01-01 | 酒泉钢铁(集团)有限责任公司 | High-magnesium internal combustion acid pellet ore |
| CN113817918A (en) * | 2021-08-05 | 2021-12-21 | 包头钢铁（集团）有限责任公司 | Method for improving reduction expansion of high-alkali metal and high-F content pellet ore |
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Application publication date: 20120411 |