CN102559960B - Steel slag treating method - Google Patents
Steel slag treating method Download PDFInfo
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- CN102559960B CN102559960B CN201210065837.5A CN201210065837A CN102559960B CN 102559960 B CN102559960 B CN 102559960B CN 201210065837 A CN201210065837 A CN 201210065837A CN 102559960 B CN102559960 B CN 102559960B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention provides a steel slag treating method comprising the following steps of: directly mixing thermal-state revolving furnace steel slag with blast furnace slag in an arc furnace in proportion, adjusting the molten slag in the furnace into a proper temperature by virtue of the arcing of the arc furnace, and stirring the molten slag by virtue of arc disturbance, so that acidic oxide and basic oxide in the molten slag are sufficiently reacted with each other; reacting free calcium oxide and free magnesium oxide in the raw steel slag with silicon dioxide component and low-calcium calcium silicate in the blast furnace slag to generate safe calcium silicate and magnesium silicate, quenching the molten slag to form glass-state solid slag which is higher in hydration reactivity and free of short-term or long-term inflation harm, and further finely grinding the solid slag into slag powder which can be safely used for related building material as the blast furnace slag. According to the method, the damage caused by the free calcium oxide and free magnesium oxide in the steel slag can be removed, and a basis is provided for the whole use of the steel slag. The heat energy of the thermal-state molten slag can be sufficiently used, so that the energy source can be saved, the energy consumption can be reduced, the cost can be reduced, and the discharge of CO2 can be reduced, and the method is extremely high in social meaning and economic meaning.
Description
Technical field
The present invention relates to a kind of process for treating steel slag.Particularly relate to slag Free CaO and free magnesium method for innocent treatment, improve steel slag utilization rate.
Background technology
Quickening along with China's industrialization, Development of China's Urbanization, the consumed resource of industrial circle will further strengthen, resources and environment problem will be more outstanding, industrial development faces stern challenge more, and further improve large industrial solid wastes level of comprehensive utilization, will be one of effective way solving resource provisioning, alleviation environmental stress.Within 2011, China's emphasis statistics blast furnace slag generation is 1.5 hundred million t, and slag generation is 5,893 ten thousand t.At present blast furnace slag is fully used at building material industry, but because of the free calcium oxide that exists in slag and the long-term hazards of free magnesium, steel slag utilization is still a difficult problem.Although existing slag slag stewing technique has solved the metal recovery being mingled with in slag, still there is no to eliminate the harm problem of free calcium oxide and free magnesium at all.Therefore large steel slag is still as industrial residue accumulation deposit, has not only caused environmental pollution, also wastes land resources.
Summary of the invention
The invention provides a kind of processing method and eliminated the harm of bessemer furnace slag Free CaO and free magnesium.
Bessemer furnace slag is a kind of waste residue that converter steelmaking produces, the liquid that the state temperature of coming out of the stove is above up to 1400 ℃, the about 40-60% of chemical composition CaO content, SiO
2the about 13-20% of content.Main mine phase is tricalcium silicate (C
3s), Dicalcium Phosphate (Feed Grade) (C
2s), kirschsteinite, free calcium oxide (f-CaO), free magnesium etc.Because the Harmful ingredient contents such as free calcium oxide (f-CaO), free MgO are high, in slag after cooling process, contain that a large amount of crystallizations is thick, the free calcium oxide of compact structure and free magnesium, these free calcium oxides and free magnesium meet after water can be in for a long time continuous hydration volumetric expansion occurs, long-term stability extreme difference while causing steel slag utilization, has seriously restricted the safe utilization of slag.。
A kind of waste residue of output when blast furnace slag is blast furnace production molten iron, the state of coming out of the stove is also the temperature liquid above up to 1400 ℃, the about 30-40% of CaO content in chemical composition, SiO
2the about 30-40% of content, the mineral that reaction forms are mainly low calcium Calucium Silicate powder.
If hot bessemer furnace slag and blast furnace slag are mixed, and slag temperature is remained on more than 1300 ℃, free calcium oxide in slag with and free magnesium will with blast furnace slag in silica component fully react and form safe Calucium Silicate powder and Magnesium Silicate q-agent, thereby eliminated the harm of free calcium oxide and free magnesium.After reacted water quenched slag chilling, air-cooled or other cooling mode chillings, form glassy solids slag or microcrystalline solids slag, further process grinding hydration activity higher and without the active metallurgical slag that can use safely of short-term or the long-term harm of expanding.
A kind of process for treating steel slag, after two kinds of hot slags are come out of the stove, directly in electric furnace, mix and be adjusted to suitable temperature in proportion, utilize electric arc disturbance to stir, various chemical compositions are fully reacted, free calcium oxide in former slag and magnesium oxide react with the silica component in blast furnace slag and generate Calucium Silicate powder and Magnesium Silicate q-agent, have eliminated the potential hazard of free calcium oxide and free magnesium.Reacted molten slag carries out chilling (shrend or air-cooled or other mode chillings), forms hydration activity higher and without the vitreous state slag of short-term or the long-term harm of expanding, can be as blast-furnace slag further processing for the material of construction of being correlated with.The metallic iron being mingled with in slag is discharged after being deposited to furnace bottom in time.
Technical solution of the present invention principle is that free CaO and the free MgO in slag can be generated safe Calucium Silicate powder and Magnesium Silicate q-agent by the low-calcium silicate in blast furnace slag and silica component absorption reaction, thereby has eliminated the harm of free calcium oxide and free magnesium.Bessemer furnace slag and blast furnace slag are mixed to complete reaction, form vitreum and a small amount of crystallite after slag chilling (shrend, air-cooled or other cooling modes), thus form hydration activity higher and without short-term or the long-term harm of expanding can Secure Application active slag.
Present method has been eradicated the harm of slag Free CaO and free magnesium, for slag all utilizes and lays a good foundation.
Present method makes the metallic iron being mingled with in slag obtain good slag iron separation, has improved recovery rate of iron.
Present method makes full use of the heat energy of hot slag, to such an extent as to save energy, minimizing energy consumption, reduces costs, and reduces CO
2discharge, there is high society and economic implications.The ingredients by weight ratio of bessemer furnace slag and blast-furnace slag is: bessemer furnace slag 0-70, blast-furnace slag 30-100.
, contain following steps:
Build electric arc furnace, by blast furnace slag and converter slag, part by weight is converter slag 0-70, and blast furnace slag 30-100, is delivered in electric furnace, electrode starting the arc heating, and in electric arc disturbance electric furnace, two kinds of slags mix promotion reaction,
At furnace bottom or bottom side, have deironing mouth, every 30min-3h emits the liquid metal iron of deposition,
The control electrode starting the arc, guarantees in electric arc furnace 1300 ℃-1600 ℃ of melt temperatures, and insulation 30min-2h reacts completely to basic oxide and acidic oxide,
Electric arc in-furnace slag is become vitreous state or crystallite state slag by chilling from slag notch flows out,
Vitreous state or crystallite state slag be through further broken, grinding, forms hydration activity higher and without the active ground-slag of short-term or the long-term harm of expanding.
Advantage of the present invention is effectively to have eliminated the harm of slag Free CaO and free magnesium, makes the slag can safe utilization, for slag all utilizes and lays the foundation.
Present method is directly utilized hot slag, takes full advantage of dross sensible heat, reduces energy consumption, reduces costs, save energy, minimizing CO
2discharge, has high society and economic implications.
A kind of process for treating steel slag, by hot bessemer furnace slag and blast furnace slag, directly in electric arc furnace, mix in proportion, utilize the electric arc furnace starting the arc that in-furnace slag is adjusted to suitable temperature, and utilize electric arc disturbance to stir slag, slag inner acidic oxide compound and basic oxide are fully reacted, free calcium oxide in former slag and magnesium oxide react generation safe Calucium Silicate powder and Magnesium Silicate q-agent with silica component and low calcium Calucium Silicate powder in blast furnace slag, have eliminated the harm of slag Free CaO and free magnesium.Slag, after chilling, forms hydration activity higher and without the glassy solids slag of short-term or the long-term harm of expanding, solid slag can further be finely ground to ground-slag as blast-furnace slag safely for relevant material of construction.
The technique that present method adopts has been eliminated the harm of slag Free CaO and free magnesium, for slag all utilizes and lays a good foundation.Present method makes full use of the heat energy of hot slag, to such an extent as to save energy, minimizing energy consumption, reduces costs, and reduces CO
2discharge, there is high society and economic implications.It is separated that present method makes slag and the metallic iron being mingled with in blast furnace slag obtain good slag iron, improved metal recovery rate.
Embodiment
Obviously, the many modifications and variations that those skilled in the art do based on aim of the present invention belong to protection scope of the present invention.
The present invention is not subject to the restriction of following example, can determine specific embodiment according to the technique of foregoing invention and actual each Steel Plant's slag situation.
Embodiment 1, and a kind of process for treating steel slag contains following steps:
Near ironworks, build electric arc furnace, by 1400 ℃ of bessemer furnace slags and 1400 ℃ of blast furnace slags by weight ratio: hot bessemer furnace slag 50, blast furnace slag 50 is delivered in electric furnace, electrode starting the arc heating, in electric arc disturbance electric furnace, two kinds of slag liquid mix and promote reaction,
At the every 2h of furnace bottom, emit the metallic iron of deposition,
Adjust 1400 ℃ of-1500 ℃ of insulations of temperature to reacting completely,
Reacted slag is shrend chilling from cinder notch flows out, and oven dry, fragmentation, grinding are made high reactivity ground-slag.
Mineralogical analysis is carried out in sampling, more than 91% is all glassy phase.
The ground-slag preparing mixes 60% and reaches the technical indicator of PO42.5 cement with the cement of portland cement clinker and adjustable solidification agent preparation.
Embodiment 2,
Near ironworks, build electric arc furnace, by liquid bessemer furnace slag and liquid blast furnace slag by weight ratio: hot bessemer furnace slag 70, blast furnace slag 30 is delivered in electric furnace, electrode starting the arc heating, in electric arc disturbance electric furnace, two kinds of slag liquid mix and promote reaction,
At the every 1.5h of furnace bottom, emit the metallic iron of deposition,
Adjust 1300 ℃ of-1500 ℃ of insulations of temperature to reacting completely,
Reacted slag is shrend chilling from cinder notch flows out, and oven dry, fragmentation, grinding are made high reactivity ground-slag.
Mineralogical analysis is carried out in sampling, more than 90% is all glassy phase.
The ground-slag 40% equivalent substitution PO42.5 cement preparing, the strength of cement index of configuration and the strength of cement index of PO42.5 do not reduce.
Embodiment 3,
Near ironworks, build electric arc furnace, the hot steel slag that converter is emitted and liquid blast furnace slag by weight ratio: hot bessemer furnace slag 30, blast furnace slag 70 is delivered in electric furnace, electrode starting the arc heating, in electric arc disturbance electric furnace, two kinds of slag liquid mix and promote reaction,
At the every 3h of furnace bottom, emit the metallic iron of deposition,
Adjust 1300 ℃ of-1500 ℃ of insulations of temperature to reacting completely,
Reacted slag is shrend chilling from cinder notch flows out, and oven dry, fragmentation, grinding are made high reactivity ground-slag.
Mineralogical analysis is carried out in sampling, more than 93% is all glassy phase.
The ground-slag preparing mixes 60% and reaches the technical indicator of PO42.5 cement with the cement of portland cement clinker and adjustable solidification agent preparation.
As mentioned above, embodiments of the invention are explained, but as long as not departing from fact inventive point of the present invention and effect can have a lot of distortion, this will be readily apparent to persons skilled in the art.Therefore, within such variation is also all included in protection scope of the present invention.
Claims (3)
1. a process for treating steel slag, it is characterized in that, hot bessemer furnace slag and blast furnace slag are directly mixed in proportion in electric furnace, described ratio is weight ratio, be specially: bessemer furnace slag 0-70 is not containing 0, blast-furnace slag 30-100 is not containing 100, and be adjusted to suitable temperature, utilize electric arc disturbance to stir slag, slag inner acidic oxide compound and basic oxide are fully reacted, silica component in free calcium oxide in former slag and magnesium oxide and blast furnace slag and low calcium Calucium Silicate powder generate safe Calucium Silicate powder and Magnesium Silicate q-agent, eliminated the harm of slag Free CaO and free magnesium, abundant reacted slag is emitted and is formed vitreous state slag by chilling from electric arc furnace, and it is higher and without the active ground-slag of short-term and the long-term harm of expanding that vitreous state slag is further finely ground to hydration activity, specifically contains following steps:
Build electric arc furnace, blast furnace slag and converter slag are delivered in electric furnace, electrode starting the arc heating, in electric arc disturbance electric furnace, two kinds of slags mix promotion reaction,
At furnace bottom or bottom side, leave deironing mouth, every 30min-3h emits the liquid metal iron of deposition,
The control electrode starting the arc, guarantees in electric arc furnace 1300 ℃-1600 ℃ of melt temperatures, and insulation 30min-2h reacts completely to basic oxide and acidic oxide,
Electric arc in-furnace slag is become glassy solids slag by chilling from slag notch flows out,
Glassy solids slag is through further broken, grinding, forms hydration activity higher and without the active ground-slag of short-term or the long-term harm of expanding.
2. a kind of process for treating steel slag according to claim 1, is characterized in that, hot bessemer furnace slag and blast furnace slag directly utilize, the heat energy that has utilized hot slag to carry.
3. a kind of process for treating steel slag according to claim 1, is characterized in that, with the electric arc furnace starting the arc, adjusts temperature of reaction, and utilizes electrode starting the arc disturbance and stir melt.
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| CN201210065837.5A CN102559960B (en) | 2012-03-13 | 2012-03-13 | Steel slag treating method |
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| CN201210065837.5A CN102559960B (en) | 2012-03-13 | 2012-03-13 | Steel slag treating method |
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| CN102559960B true CN102559960B (en) | 2014-02-19 |
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| CN102766725A (en) * | 2012-08-02 | 2012-11-07 | 山西太钢不锈钢股份有限公司 | Thermal state utilization method of stainless steel continuous casting residue |
| CN104058609A (en) * | 2014-05-30 | 2014-09-24 | 马钢(集团)控股有限公司 | Production method of steel slag composite micropowder |
| CN104446021A (en) * | 2014-11-26 | 2015-03-25 | 攀枝花环业冶金渣开发有限责任公司 | Steel and iron slag micro-powder and production method thereof |
| CN105327926B (en) * | 2015-10-27 | 2017-08-11 | 安徽工业大学 | A kind of method that calcium iron dioxygen carrier is prepared by raw material of converter slag |
| CN106045347B (en) * | 2016-06-02 | 2018-03-30 | 辽宁科技大学 | A kind of method for melting free calcium oxide in resolution converter slag |
| CN106048108B (en) * | 2016-07-18 | 2018-05-04 | 东北大学 | A kind of method of titaniferous mixing slag melting and reducing recycling and modifier treatment |
| CN106048106B (en) * | 2016-07-18 | 2018-05-04 | 东北大学 | A kind of method containing rare earth with the recycling of niobium mixing slag melting and reducing and modifier treatment |
| CN106048109B (en) * | 2016-07-18 | 2018-05-04 | 东北大学 | A kind of method for mixing the recycling of slag melting and reducing and modifier treatment |
| CN106517834B (en) * | 2016-11-25 | 2019-04-16 | 江西理工大学 | A method of utilizing molten blast furnace slag high temperature harmless treatment stainless steel slag |
| CN106925414B (en) * | 2017-03-22 | 2019-08-13 | 福建省建筑科学研究院有限责任公司 | A kind of improvement stainless steel refining slag grinding characters and active method |
| CN107915413A (en) * | 2017-10-19 | 2018-04-17 | 山西恒天镁业有限公司 | A kind of production of magnesium by pidgeonprocess reducing slag innoxious use method |
| CN108642224B (en) * | 2018-05-15 | 2020-06-23 | 鞍钢股份有限公司 | Method for modifying converter slag by using blast furnace slag and molten iron |
| CN110156352A (en) * | 2019-05-17 | 2019-08-23 | 华北理工大学 | A kind of preparation method of air quenching metallurgical slag microballon |
| CN110438273A (en) * | 2019-09-03 | 2019-11-12 | 迁安轧一钢铁集团有限公司 | A kind of processing method of steel slag tailings |
| CN114163147A (en) * | 2021-11-24 | 2022-03-11 | 江苏科技大学 | Method for reducing free calcium oxide in steel slag by using nickel-iron slag and application thereof |
| CN115028378A (en) * | 2022-06-24 | 2022-09-09 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for preparing high-activity micro powder |
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Address after: 101400, No. 9, Long Yun Road, Jingwei Industrial Zone, North Housing Town, Huairou District, Beijing Patentee after: Beijing United Rong Da engineering materials Limited by Share Ltd Address before: 101400, No. 9, Long Yun Road, Jingwei Industrial Zone, North Housing Town, Huairou District, Beijing Patentee before: Beijing Allied Rongda Engineering Material Co., Ltd. |