CN103343179B - Converter steelmaking synthetic slag former - Google Patents

Converter steelmaking synthetic slag former Download PDF

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Publication number
CN103343179B
CN103343179B CN201310319775.0A CN201310319775A CN103343179B CN 103343179 B CN103343179 B CN 103343179B CN 201310319775 A CN201310319775 A CN 201310319775A CN 103343179 B CN103343179 B CN 103343179B
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slag former
converter
converter steelmaking
synthetic slag
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CN103343179A (en
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吴雪健
王海军
蒙李朋
简秋生
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Zhanjiang Shen Shen Technology Industry Co., Ltd.
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MA'ANSHAN HUASHENG METALLURGICAL SCIENCE AND TECHNOLOGY DEVELOPMENT Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Abstract

The invention discloses a converter steelmaking synthetic slag former, belonging to the technical field of converter steelmaking of ferrous metallurgy. The converter steelmaking synthetic slag former consists of the following components in parts by mass: 10-18 parts of converter dust, 25-32 parts of scale, 5-10 parts of gas ash, 3-5 parts of fly ash, 15-25 parts of pellet sieve residue, 10-15 parts of sinter sieve residue, 9-16 parts of waste high-alumina brick, 12-18 parts of bentonite, 30-45 parts of active lime, 6-12 parts of manganese oxide, 5-10 parts of magnesium oxide and 10-15 parts of sodium carbonate. According to the converter steelmaking synthetic slag former, the wastes, such as converter dust, scale, gas ash and fly ash, which are difficult to utilize comprehensively, of a steelworks are used as partial components of the synthetic slag former so as to recycle the wastes, and moreover, the slag forming time is effectively reduced, and the slag can be quickly formed in the initial stage of converter blowing to realize efficient dephosphorization.

Description

Slag former is synthesized in a kind of converter steelmaking
Technical field
The present invention relates to ferrous metallurgy converter steeling technology field, more particularly, relate to the synthetic slag former of a kind of converter steelmaking.
Background technology
Slag making is a requisite ring in steelmaking process, and steel-making and ironmaking will make the impurity in steel reduce, and after these impurity are separated, enter slag, because slag light specific gravity, swim in above molten steel, than being easier to, remove, only need process by skimming just can be separated with molten steel by slag.Slag also has the function that protection molten steel does not directly contact with atmosphere in addition, and slag making adds slag former exactly in steelmaking process, to form slag, and convenient smelting.
Therefore, converter slag-making is the key operation of converter smelting, and Fast Slag Melting is the core content of converter slag-making, and adopting slag former is exactly in order to promote converter Fast Slag Melting, in the slag former using in one's early years, contains CaF 2but, CaF 2not only corrode furnace lining, and contaminate environment.And for reaching better dephosphorization effect, just necessary rapid slagging of steel-making initial stage, forms the slag with certain basicity, low melting point, good fluidity.
Through patent retrieval, Chinese Patent Application No.: 201210426467.3, the applying date: on October 31st, 2012, invention and created name is: a kind of composite fluxing medium for revolving furnace, its each components in mass portion is composed as follows: without calcium chromium slag 68-73 part, white fused alumina 12-15 part and Wingdale 20-23 part.Although this composite fluxing medium has shortened sludging time, improved slagging speed, its dephosphorization effect has much room for improvement.
In addition, Chinese Patent Application No.: 201010266582.X, on August 25 2010 applying date, invention and created name is: converter steelmaking fluoride-free composite fluxing medium, this application case relates to a kind of converter steelmaking fluoride-free composite fluxing medium, and (%) is comprised of following component by weight percentage: A1 2o 325-45, Fe 2o 315-35, B 2o 33-10, MgO5-15, CaO3-15, all the other are impurity and binding agent, its industrial raw material is: red bauxite powder, fine iron breeze, containing boron ore powder, ground dolomite by the component of afore mentioned rules (weight percent) preparation, add binding agent, through mixing-granulate-dry-cooling-pack, be particulate state pelletizing, particle diameter diameter is 30-60mm.Although the slag former in this application case is floride-free, not by Using Metallurgical Solid Wastes recycling, and it is to be improved to change slag speed, and dephosphorization efficiency has much room for improvement.
Summary of the invention
1.. the technical problem that invention will solve
The object of the invention is to overcome in prior art, Using Metallurgical Solid Wastes is difficult to comprehensive utilization, and slag former often contains CaF 2contaminate environment and slagging speed are slow, and the deficiency that dephosphorization effect is poor provides a kind of converter steelmaking to synthesize slag former, not only recycling Using Metallurgical Solid Wastes, and reach the object of rapid slagging, high efficiency dephosphorating.
2.. technical scheme
For achieving the above object, technical scheme provided by the invention is:
Slag former is synthesized in a kind of converter steelmaking of the present invention, and each component forms by following mass parts:
Further, the median size of described converter dust, iron scale, gas ash, flyash, pellet minus mesh, agglomerate minus mesh and waste and old high alumina brick is 32-56 micron.
Further, each component forms by following mass parts:
Further, when described iron scale derives from forging and hot rolling hot-work, the compound that in iron and steel and air, the reaction of oxygen forms, the quality percentage composition of its component is: TFe:73-76%, SiO 2: 3-5%, CaO:5-6%, P:0.04-0.07%, S:0.08-0.1%, all the other are inevitable impurity.
Further, the quality percentage composition of described gas ash composition is: TFe:28-35%, C:25-33%, CaO:7.5-9.7%, SiO 2: 4.5-6%, MgO:1.2-1.8%, Al 2o 3: 2.4-3.8%, all the other are inevitable impurity.
3.. beneficial effect
Adopt technical scheme provided by the invention, compare with existing known technology, there is following unusual effect:
(1) the synthetic slag former of a kind of converter steelmaking of the present invention, Steel Plant's converter dust, iron scale, gas ash, these wastes that are difficult to comprehensive utilization of flyash are used as the part component of synthetic slag former, these refuses are recycled, and pellet minus mesh, agglomerate minus mesh have been effectively utilized, prevent the secondary processing of material, not only reduced the production cost of slag former, meanwhile, refuse has been got utilization;
(2) the synthetic slag former of a kind of converter steelmaking of the present invention, this synthetic slag former shortens sludging time effectively, can bessemerize initial stage rapid slagging, improves dephosphorization effect in smelting process, reaches the object of high efficiency dephosphorating, and dephosphorization efficiency reaches more than 84%;
(3) the synthetic slag former of a kind of converter steelmaking of the present invention, this slag former has been avoided CaF 2use, and be wherein furnished with a certain amount of magnesium oxide, alleviate the erosion of initial stage slag to furnace lining, protection furnace lining, improves furnace life;
(4) the synthetic slag former of a kind of converter steelmaking of the present invention, this synthetic slag former has been avoided CaF 2in the slag making use in period, effectively prevented environmental pollution.
Embodiment
For further understanding content of the present invention, below in conjunction with embodiment, the invention will be further described.
Embodiment 1
The synthetic slag former of a kind of converter steelmaking of the present embodiment, its component and content are as follows: converter dust 13kg, iron scale 28kg, gas ash 8kg, flyash 4kg, pellet minus mesh 20kg, agglomerate minus mesh 13kg, waste and old high alumina brick 12kg, wilkinite 15kg, quickened lime 38kg, manganese oxide 10kg, magnesium oxide 8kg, sodium carbonate 12kg.What deserves to be explained is, the converter dust in the present invention is the ferric charge reclaiming through fly-ash separator from the furnace gas of oxygen coverter.In addition, the gas dust removal system of iron-smelting blast furnace is comprised of two sections of gravitational dust collection and meticulous dedustings, gas ash of the present invention is in the meticulous fly-ash separator of second segment, the dry type grain dust that dry gas cleaning obtains, the quality percentage composition of this gas ash composition is: TFe:32%, C:28%, CaO:8.6%, SiO 2: 5.4%, MgO:1.5%, Al 2o 3: 3.2%, all the other are inevitable impurity.Above-mentioned flyash is that before induced draft fan enters atmosphere by coal-fired flue-gas, chilling is the particulate of vitreum state, through fly-ash separator, and the particulate separated, collection obtains.
When the iron scale of the present embodiment derives from forging and hot rolling hot-work, the compound that in iron and steel and air, the reaction of oxygen forms, the quality percentage composition of its component is: TFe:74%, SiO 2: 4%, CaO:5.5%, P:0.05%, S:0.09%, all the other are inevitable impurity.
In blast furnace production process, if it is too thin to enter furnace charge thing granularity, resistance is large, permeability of stock column is poor, affect smooth operation of furnace, therefore must be by sieving to control the granularity into stove material, pellet minus mesh of the present invention and agglomerate minus mesh, be pellet and agglomerate and enter fines under stove sieve before.Wherein, the quality percentage composition of agglomerate minus mesh composition is: TFe:55.8%, FeO:10.2%, CaO:11%, SiO 2: 8.1%, MgO:1.4%, Al 2o 3: 1.3%, S:0.042%, all the other are inevitable impurity.
Above-mentioned waste and old high alumina brick is aluminium sesquioxide (Al 2o 3) content is higher than the waste of 48% aluminosillicate refractory goods.
The preparation method of the synthetic slag former of the present embodiment, its step is as follows:
(1) taking in mass ratio converter dust 13kg, iron scale 28kg, gas ash 8kg and waste and old high alumina brick 12kg, in grinding machine for grinding, to become median size be respectively 32-56 micron, and the converter dust after above-mentioned grinding, iron scale, gas ash, waste and old high alumina brick are added to water mixing, and taking wilkinite 5kg adds, in stirrer for mixing, stir 20 minutes, stirring velocity is 220r/min, mixes to obtain mixture A;
(2) taking in mass ratio flyash 4kg, pellet minus mesh 20kg, in grinding machine for grinding, to become median size respectively with agglomerate minus mesh 13kg be 32-56 micron, and above-mentioned flyash, pellet minus mesh and agglomerate minus mesh are added to water mixing, and taking wilkinite 4kg adds, in stirrer for mixing, stir 22 minutes, stirring velocity is 230r/min, mixes to obtain mixture B;
(3) take in mass ratio quickened lime 38kg, manganese oxide 10kg, magnesium oxide 8kg and wilkinite 6kg and add in the mixture B obtaining in step (2) and stir, obtain mixture C;
(4) mixture C that the mixture A that weighing sodium carbonate 12kg obtains with step (1) in mass ratio and step (3) obtain is mixed, and after being uniformly mixed, it is carried out at 1350 ℃ to fritting, fritting 80min, and obtain mixture D;
(5), after the mixture D that step (4) obtained is cooling, is broken for 3-8cm and obtains synthetic slag former.
The synthetic slag former of a kind of converter steelmaking of the present embodiment, take 50t converter as example, while entering stove, guarantee the water content <1.2% of synthetic slag former, entering stove add-on is 12kg/t steel, table 1 is for being used the steel-making effect data of the experiment heat of the present embodiment slag former, wherein this experiment heat carries out identical experiment 10 times, data in table 1 are the mean value of 10 identical experiment of experiment heat, wherein contrast heat for using the steel-making effect data of existing slag former, and to enter stove add-on be 12kg/t steel.
Table 1 is used the steel-making effect of the slag former of this composition
As shown in Table 1, compare with the contrast heat of prior art, first slag forms and has shortened more than 78 seconds, and dephosphorization efficiency can reach more than 84%, and molten steel consumption reduction, has saved steelmaking feed, saves production cost.Improved metallurgical effect, for smelting Clean Steel, provide basis, and this reasonable in technology utilized the refuse of iron and steel enterprise, not only reduced the production cost of slag former, meanwhile, refuse has been got utilization, the economic benefit that has increased substantially enterprise, has broad application prospects.
Embodiment 2
The synthetic slag former of a kind of converter steelmaking of the present embodiment, its component and content are as follows: converter dust 10kg, iron scale 25kg, gas ash 5kg, flyash 3kg, pellet minus mesh 15kg, agglomerate minus mesh 10kg, waste and old high alumina brick 9kg, wilkinite 12kg, quickened lime 30kg, manganese oxide 6kg, magnesium oxide 5kg, sodium carbonate 10kg.What deserves to be explained is, the converter dust in the present invention is the ferric charge reclaiming through fly-ash separator from the furnace gas of oxygen coverter.In addition, the gas dust removal system of iron-smelting blast furnace is comprised of two sections of gravitational dust collection and meticulous dedustings, gas ash of the present invention is in the meticulous fly-ash separator of second segment, the dry type grain dust that dry gas cleaning obtains, the quality percentage composition of this gas ash composition is: TFe:35%, C:25%, CaO:9.7%, SiO 2: 6%, MgO:1.2%, Al 2o 3: 2.4%, all the other are inevitable impurity.Above-mentioned flyash is that before induced draft fan enters atmosphere by coal-fired flue-gas, chilling is the particulate of vitreum state, through fly-ash separator, and the particulate separated, collection obtains.
When the iron scale of the present embodiment derives from forging and hot rolling hot-work, the compound that in iron and steel and air, the reaction of oxygen forms, the quality percentage composition of its component is: TFe:76%, SiO 2: 3%, CaO:5%, P:0.07%, S:0.1%, all the other are inevitable impurity.
In blast furnace production process, if it is too thin to enter furnace charge thing granularity, resistance is large, permeability of stock column is poor, affect smooth operation of furnace, therefore must be by sieving to control the granularity into stove material, pellet minus mesh of the present invention and agglomerate minus mesh, be pellet and agglomerate and enter fines under stove sieve before.Wherein, the quality percentage composition of agglomerate minus mesh composition is: TFe:56.2%, FeO:9.3%, CaO:9.7, SiO 2: 8.5%, MgO:1.6%, Al 2o 3: 1.2%, S:0.053%, all the other are inevitable impurity.
Above-mentioned waste and old high alumina brick is aluminium sesquioxide (Al 2o 3) content is higher than the waste of 48% aluminosillicate refractory goods.
The preparation method of the synthetic slag former of the present embodiment, its step is as follows:
(1) taking in mass ratio converter dust 10kg, iron scale 25kg, gas ash 5kg and waste and old high alumina brick 9kg, in grinding machine for grinding, to become median size be respectively 32-56 micron, and the converter dust after above-mentioned grinding, iron scale, gas ash, waste and old high alumina brick are added to water mixing, and taking wilkinite 4kg adds, in stirrer for mixing, stir 18 minutes, stirring velocity is 200r/min, mixes to obtain mixture A;
(2) taking in mass ratio flyash 3kg, pellet minus mesh 15kg, in grinding machine for grinding, to become granularity respectively with agglomerate minus mesh 10kg be 32-56 micron, and above-mentioned flyash, pellet minus mesh and agglomerate minus mesh are added to water mixing, and taking wilkinite 3kg adds, in stirrer for mixing, stir 20 minutes, stirring velocity is 200r/min, mixes to obtain mixture B;
(3) take in mass ratio quickened lime 30kg, manganese oxide 6kg, magnesium oxide 5kg and wilkinite 5kg and add in the mixture B obtaining in step (2) and stir, obtain mixture C;
(4) mixture C that the mixture A that weighing sodium carbonate 10kg obtains with step (1) in mass ratio and step (3) obtain adds water and mixes, and after being uniformly mixed, it is carried out at 1300 ℃ to fritting, fritting 100min, and obtain mixture D;
(5), after the mixture D that step (4) obtained is cooling, is broken for 3-8cm and obtains synthetic slag former.
The synthetic slag former of a kind of converter steelmaking of the present embodiment, its steel-making effect is substantially with embodiment 1, improved metallurgical effect, and utilized to this reasonable in technology the refuse of iron and steel enterprise, not only reduced the production cost of slag former, meanwhile, refuse has been got utilization, the economic benefit that has increased substantially enterprise, has broad application prospects.
Embodiment 3
The synthetic slag former of a kind of converter steelmaking of the present embodiment, its component and content are as follows: converter dust 18kg, iron scale 32kg, gas ash 10kg, flyash 5kg, pellet minus mesh 25kg, agglomerate minus mesh 15kg, waste and old high alumina brick 16kg, wilkinite 18kg, quickened lime 45kg, manganese oxide 12kg, magnesium oxide 10kg, sodium carbonate 15kg.What deserves to be explained is, the converter dust in the present invention is the ferric charge reclaiming through fly-ash separator from the furnace gas of oxygen coverter.In addition, the gas dust removal system of iron-smelting blast furnace is comprised of two sections of gravitational dust collection and meticulous dedustings, gas ash of the present invention is in the meticulous fly-ash separator of second segment, the dry type grain dust that dry gas cleaning obtains, the quality percentage composition of this gas ash composition is: TFe:28%, C:33%, CaO:7.5%, SiO 2: 4.5%, MgO:1.8%, Al 2o 3: 3.8%, all the other are inevitable impurity.Above-mentioned flyash is that before induced draft fan enters atmosphere by coal-fired flue-gas, chilling is the particulate of vitreum state, through fly-ash separator, and the particulate separated, collection obtains.
When the iron scale of the present embodiment derives from forging and hot rolling hot-work, the compound that in iron and steel and air, the reaction of oxygen forms, the quality percentage composition of its component is: TFe:73%, SiO 2: 5%, CaO:6%, P:0.04%, S:0.08%, all the other are inevitable impurity.
In blast furnace production process, if it is too thin to enter furnace charge thing granularity, resistance is large, permeability of stock column is poor, affect smooth operation of furnace, therefore must be by sieving to control the granularity into stove material, pellet minus mesh of the present invention and agglomerate minus mesh, be pellet and agglomerate and enter fines under stove sieve before.Wherein, the quality percentage composition of agglomerate minus mesh composition is: TFe:55.4%, FeO:10.7%, CaO:11.2%, SiO 2: 7.7%, MgO:1.2%, Al 2o 3: 1.5%, S:0.021%, all the other are inevitable impurity.
Above-mentioned waste and old high alumina brick is aluminium sesquioxide (Al 2o 3) content is higher than the waste of 48% aluminosillicate refractory goods.
The preparation method of the synthetic slag former of the present embodiment, its step is as follows:
(1) taking in mass ratio converter dust 18kg, iron scale 32kg, gas ash 10kg and waste and old high alumina brick 16kg, in grinding machine for grinding, to become median size be respectively 32-56 micron, and the converter dust after above-mentioned grinding, iron scale, gas ash, waste and old high alumina brick are added to water mixing, and taking wilkinite 6kg adds, in stirrer for mixing, stir 22 minutes, stirring velocity is 250r/min, mixes to obtain mixture A;
(2) taking in mass ratio flyash 5kg, pellet minus mesh 25kg, in grinding machine for grinding, to become median size respectively with agglomerate minus mesh 15kg be 32-56 micron, and above-mentioned flyash, pellet minus mesh and agglomerate minus mesh are added to water mixing, and taking wilkinite 5kg adds, in stirrer for mixing, stir 25 minutes, stirring velocity is 250r/min, mixes to obtain mixture B;
(3) take in mass ratio quickened lime 45kg, manganese oxide 12kg, magnesium oxide 10kg and wilkinite 7kg add in the mixture B obtaining in step (2) and stir, and obtain mixture C;
(4) mixture C that the mixture A that weighing sodium carbonate 15kg obtains with step (1) in mass ratio and step (3) obtain is mixed, and after being uniformly mixed, it is carried out at 1450 ℃ to fritting, fritting 50min, and obtain mixture D;
(5), after the mixture D that step (4) obtained is cooling, is broken for 3-8cm and obtains synthetic slag former.
The synthetic slag former of a kind of converter steelmaking of the present embodiment, its steel-making effect is substantially with embodiment 1, improved metallurgical effect, and utilized to this reasonable in technology the refuse of iron and steel enterprise, not only reduced the production cost of slag former, meanwhile, refuse has been got utilization, the economic benefit that has increased substantially enterprise, has broad application prospects.

Claims (3)

1. a slag former is synthesized in converter steelmaking, and its spy is being: each component forms by following mass parts:
Wherein:
When described iron scale derives from forging and hot rolling hot-work, the compound that in iron and steel and air, the reaction of oxygen forms, the quality percentage composition of its component is: TFe:73-76%, SiO 2: 3-5%, CaO:5-6%, P:0.04-0.07%, S:0.08-0.1%, all the other are inevitable impurity;
The quality percentage composition of described gas ash composition is: TFe:28-35%, C:25-33%, CaO:7.5-9.7%, SiO 2: 4.5-6%, MgO:1.2-1.8%, Al 2o 3: 2.4-3.8%, all the other are inevitable impurity.
2. the synthetic slag former of a kind of converter steelmaking according to claim 1, is characterized in that: the median size of described converter dust, iron scale, gas ash, flyash, pellet minus mesh, agglomerate minus mesh and waste and old high alumina brick is 32~56 microns.
3. slag former is synthesized in a kind of converter steelmaking according to claim 1 and 2, it is characterized in that: each component forms by following mass parts:
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CN104531927B (en) * 2014-12-11 2016-08-24 马鞍山华盛冶金科技发展有限公司 A kind of solid packing of cast steel cooling wall casting
CN105200190A (en) * 2015-11-05 2015-12-30 攀钢集团攀枝花钢铁研究院有限公司 Desulfurization carburant capable of improving quality of by-product molten iron of titanium slag electric furnace and preparation method
CN111235354B (en) * 2020-04-03 2021-07-06 北京璞域环保科技有限公司 Production process of LF multifunctional deoxidation submerged arc slag

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CN102978385B (en) * 2012-10-31 2013-09-18 高金菊 Carbon-containing pellet for blast furnace
CN103060522B (en) * 2013-02-08 2015-11-25 武钢集团昆明钢铁股份有限公司 A kind of slag former and preparation method being applicable to middle high phosphorus semi-steel dephosphorizing

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Denomination of invention: Preparation method of converter steelmaking synthetic slag former

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