CN104789731B - Semi-steel making slag former and its slagging method - Google Patents
Semi-steel making slag former and its slagging method Download PDFInfo
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Abstract
The present invention relates to semi-steel making slag former and its slagging method, belong to metallurgical technology field.Present invention solves the technical problem that it is to provide semi-steel making slag former.Semi-steel making slag former of the present invention, is consisted of the following components in percentage by weight：Al2O3：20~38%, SiO2：20~30%, the oxide of iron：15~20%, CaO：10~15%, MgO：3~9%, remaining is impurity.Compared with prior art, semi-steel making slag former of the present invention has the characteristics of low cost, reduction slag melting, can promote rapid slagging, improve converter dephosphorization effect.Using semi-steel making slag former of the present invention and slagging method, it can make during semisteel smelting that initial stage, slag formed time control within 2min, endpoint molten steel phosphorus content is controlled within 0.008%.
Description
Technical field
The present invention relates to semi-steel making slag former and its slagging method, belong to metallurgical technology field.
Background technology
China is vanadium titano-magnetite big country, possesses abundant v-ti magnetite ore resources, and the country climbs steel, holds steel, elder brother's steel, prestige steel
Deng iron and steel enterprise smelted using vanadium titano-magnetite, pneumatic steelmaking main material is using after special vanadium extraction by converter blowing
Half steel, carbon weight/mass percentage composition is 3.4%~4.0% in the half steel that vanadium-bearing hot metal obtains after desulfurization vanadium extraction, silicon, manganese in half steel
Heating slagging constituent content is vestige, and the control of sulphur weight/mass percentage composition is within 0.015% in half steel, half steel phosphorus quality percentage
Content is 0.060%~0.080%, therefore semisteel smelting has in converting process that acid slagging material is few, slag system constituent element is single,
And the features such as shortage of heat, cause to form length the time required to slag at initial stage under the conditions of semi-steel making, dephosphorization rate is low.Shortage of heat
Problem can be addressed by adding the method for temperature raising agent, but slagging speed is slow, dephosphorization rate is low, be always that semi-steel making is dashed forward
The problem of going out.
In existing technology, the existing document report of semi-steel making slag former.As patent CN99115048.1 is disclosed again
Slag former is closed, (percentage by weight) steel-smelting sewage sludge 10%~70% is mainly contained, light-burning magnesium powder 30%~90%, can additionally contain
There is silicon powder 1%~8%, precipitated calcium carbonate 6%~8% and other contents are more than 0% material for being less than or equal to 5%.The slag making
Agent has fusing fast, and utilization rate is high, the advantages of protecting furnace lining and recycle steel-smelting sewage sludge.Patent 103484596A discloses one
Kind half steel slag former and preparation method thereof and Semi-steel making method.The composition of the half steel slag former by weight include 40%~
45% SiO2, 15%~20% CaO, 2%~5% MnO, 5%~8% MgO and 20%~35% FeO.Should
Steelmaking slag is quickly formed when half steel slag former can advantageously promote semisteel smelting, is advantageous to converter dephosphorization, sulphur is returned in control converter.
But its steel-making slag at initial stage formation time needs further to be shortened.
Periodical literature " development and application of climbing steel steel-making composite fluxing medium " have devised according to the characteristics of semi-steel making and make
The composition of slag agent and to demonstrate composite fluxing medium main component by contrast test be (percentage by weight) SiO2(47.30%),
Al2O3(7.58%), initial stage, the slag formation time was 4.97min when CaO (11.66%), MnO (7.67%), compared with contrast test heat
Slag at initial stage can be shortened and form time 0.73min, while there is preferable dephosphorization and desulfurization ability using the slag former.The document is this
The early-stage Study of invention, its slag formation time at initial stage need further to be shortened.
The content of the invention
Present invention solves the technical problem that it is to provide semi-steel making slag former.
Semi-steel making slag former of the present invention, is consisted of the following components in percentage by weight：Al2O3：20~38%, SiO2：20
~30%, the oxide of iron：15~20%, CaO：10~15%, MgO：3~9%, remaining is impurity.
Wherein, the oxide of the iron is Fe2O3And FeO.
Further, the granularity of the semi-steel making slag former is 10~50mm.
Preferably, semi-steel making slag former of the present invention consists of the following components in percentage by weight：Al2O3：
20%, SiO2：30%, the oxide of iron：20%, CaO:15%, MgO:9%, remaining is impurity；Or by following weight percent
The component composition of ratio：Al2O3：30%, SiO2：25%, the oxide of iron：18%, CaO：13%, MgO：6%, remaining is impurity；
Or consist of the following components in percentage by weight：Al2O3：38%, SiO2：20%, the oxide of iron：20%, CaO：10%,
MgO：3%, remaining is impurity.
Second technical problem that the present invention solves is to provide the slagging method of semi-steel making.
The slagging method of semi-steel making of the present invention, start in converter smelting and semi-steel making of the present invention is added during oxygen blast
Slag former carries out slag making.
Further, the semi-steel making slag former adds with active lime, dolomitic lime, and in mass ratio, it is living
Property lime and the total addition of dolomitic lime:Semi-steel making slag former addition=1:0.8~1.5.
Further, when occurring returning dry phenomenon in smelting process, 1~2kg/ of semi-steel making slag former of the present invention is added
T steel.
Compared with prior art, semi-steel making slag former of the present invention has the characteristics of low cost, reduction slag melting, can promote
Enter rapid slagging, improve converter dephosphorization effect.Using semi-steel making slag former of the present invention and slagging method, when can make semisteel smelting
Initial stage, slag formed time control within 2min, and endpoint molten steel phosphorus content is controlled within 0.008%.
Embodiment
Semi-steel making slag former of the present invention, is consisted of the following components in percentage by weight：Al2O3：20~38%, SiO2：20
~30%, the oxide of iron：15~20%, CaO：10~15%, MgO：3~9%, remaining is impurity.
Wherein, the oxide of the iron is Fe2O3And FeO.
Further, the granularity of the semi-steel making slag former is preferably 10~50mm.
Further, semi-steel making slag former of the present invention, is preferably consisted of the following components in percentage by weight：Al2O3：
20%, SiO2：30%, the oxide of iron：20%, CaO:15%, MgO:9%, remaining is impurity；Or preferably by following weight
The component composition of percentage：Al2O3：30%, SiO2：25%, the oxide of iron：18%, CaO：13%, MgO：6%, remaining is
Impurity；Or preferably consist of the following components in percentage by weight：Al2O3：38%, SiO2：20%, the oxide of iron：20%,
CaO：10%, MgO：3%, remaining is impurity.
Semi-steel making slag former of the present invention can reduce just slag melting point.Al in slag former2O3, can be by the CaO fusing points in clinker
Minimum to be down to 1395 DEG C, the oxide of iron also has reduction 2CaOSiO2The effect of fusing point, it is minimum to the CaO fusing points in clinker
1155~1205 DEG C can be down to.The SiO contained in slag former2, pass through 3CaO+SiO2=3CaOSiO2Reaction, formed substantial amounts of
3CaO·SiO2Etc. the compound of low melting point, promote lime fusing, the time is formed so as to shorten slag at initial stage.
Semi-steel making slag former of the present invention can use bauxite, quartz sand and iron ore to be mixed according to a certain percentage for raw material
Even pressure ball is made.
The slagging method of semi-steel making of the present invention, start in converter smelting and semi-steel making of the present invention is added during oxygen blast
Slag former carries out slag making.
Wherein, semi-steel making slag former of the present invention adds with active lime, dolomitic lime, in mass ratio, active stone
Ash and the total addition of dolomitic lime:Semi-steel making slag former addition=1:0.8~1.5.
Further, when occurring returning dry phenomenon in smelting process, 1~2kg/ of semi-steel making slag former of the present invention is added
T steel.
Wherein, described to return dry phenomenon and refer in pneumatic steelmaking converting process, because oxygen is pressed high, rifle position is too low, especially in carbon
Fierce mid-term is aoxidized, TFe contents are low to cause dystectic material in slag to separate out, clinker retrogradation, it is impossible to cover metal bath surface
Phenomenon.
Wherein, the active lime, dolomitic lime are the slag making materials that semi-steel making is commonly used.Active lime mainly contains CaO,
Its content is not less than 88wt%.Dolomitic lime is mainly that 35~45%, MgO mass fractions are containing CaO and MgO, CaO mass fraction
35~55%.
The embodiment of the present invention is further described with reference to embodiment, therefore not limited the present invention
System is among described scope of embodiments.
In following examples, active lime and dolomitic lime are purchased from Mining Co., Pangang Group.
Embodiment 1
The 120t converters of certain factory use semi-steel making, and half steel phosphorus content is 0.075%, is converted when converter smelting starts into converter
Enter half steel, and add the slag making materialses such as active lime, dolomitic lime, smelt and start that with oxygen blast process work can be separately added into batches
Property lime, the slag making materials such as dolomitic lime, slag former, active lime, dolomitic lime add total amount be 30kg/ steel, often batch of material add
Enter active lime, dolomitic lime simultaneously by (active lime and dolomitic lime add total amount:Slag making dosage=1:0.8) ratio adds
Enter slag former, the total dosage of slag former is 24kg/ steel, and smelting process is returned dry, and slag former 1kg/t steel, slag making are added to stove quantification
Agent composition is：Al2O3：20%, SiO2：30%, the oxide (Fe of iron2O3And FeO)：20%, CaO:15%, MgO:9%, remaining
For impurity, granularity is 10~50mm.When carrying out slag making using the slag former, initial stage slag to form the time be only 1.9min, terminal steel
Water phosphorus content is 0.006%.
Embodiment 2
The 120t converters of certain factory use semi-steel making, and half steel phosphorus content is 0.065%, is converted when converter smelting starts into converter
Enter half steel, and add the slag making materialses such as active lime, dolomitic lime, smelt and start that with oxygen blast process work can be separately added into batches
Property lime, the slag making materials such as dolomitic lime, slag former.It is 28kg/ steel that active lime, dolomitic lime, which add total amount, is added per batch of material
Enter active lime, dolomitic lime simultaneously by (active lime and dolomitic lime add total amount:Slag making dosage=1:1) ratio adds
Slag former, the total dosage of slag former are 28kg/ steel, and slag former composition is：Al2O3：30%, SiO2：25%, the oxide (Fe of iron2O3
And FeO)：18%, CaO：13%, MgO：6%, remaining is impurity, and granularity is 10~50mm.Slag making is carried out using the slag former
When, the slag formation time at initial stage is only 1.8min, and endpoint molten steel phosphorus content is 0.008%.
Embodiment 3
The 120t converters of certain factory use semi-steel making, and half steel phosphorus content is 0.080%, is converted when converter smelting starts into converter
Enter half steel, and add the slag making materialses such as active lime, dolomitic lime, smelt and start that with oxygen blast process work can be separately added into batches
Property lime, the slag making materials such as dolomitic lime, slag former.It is 25kg/ steel that active lime, dolomitic lime, which add total amount, is added per batch of material
Enter active lime, dolomitic lime simultaneously by (active lime and dolomitic lime add total amount:Slag making dosage=1:1.5) ratio adds
Enter slag former, the total dosage of slag former is 37.5kg/ steel, and slag former composition is：Al2O3：38%, SiO2：20%, the oxide of iron
(Fe2O3And FeO)：20%, CaO：10%, MgO：3%, remaining is impurity, and granularity is 10~50mm.Carried out using the slag former
During slag making, the slag formation time at initial stage is only 1.6min, and endpoint molten steel phosphorus content is 0.006%.
Claims (6)
1. the slagging method of semi-steel making, it is characterised in that：Start to make with addition semi-steel making during oxygen blast in converter smelting
Slag agent carries out slag making；Wherein, the phosphorus weight/mass percentage composition of the half steel is 0.06~0.08%；The semi-steel making slag former
Consist of the following components in percentage by weight：Al2O3：20~38%, SiO2：20~30%, the oxide of iron：15~20%,
CaO：10~15%, MgO：3~9%, remaining is impurity.
2. the slagging method of semi-steel making according to claim 1, it is characterised in that：The oxide of iron is Fe2O3And FeO.
3. the slagging method of semi-steel making according to claim 1, it is characterised in that：The grain of the semi-steel making slag former
Spend for 10~50mm.
4. the slagging method of semi-steel making according to claim 1, it is characterised in that by following components in percentage by weight
Composition：Al2O3：20%, SiO2：30%, the oxide of iron：20%, CaO:15%, MgO:9%, remaining is impurity；Or by with
The component composition of lower percentage by weight：Al2O3：30%, SiO2：25%, the oxide of iron：18%, CaO：13%, MgO：6%,
Remaining is impurity；Or consist of the following components in percentage by weight：Al2O3：38%, SiO2：20%, the oxide of iron：
20%, CaO：10%, MgO：3%, remaining is impurity.
5. the slagging method of the semi-steel making according to any one of Claims 1 to 4, it is characterised in that：The semi-steel making
Slag former adds with active lime, dolomitic lime, and in mass ratio, active lime and the total addition of dolomitic lime:Half steel
Steelmaking slag agent addition=1:0.8~1.5.
6. the slagging method of semi-steel making according to claim 5, it is characterised in that：Occur returning in smelting process and do now
As when, add semi-steel making slag former 1~2kg/t steel.
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| FR2271293B1 (en) * | 1974-05-15 | 1977-06-24 | Lafarge Fondu Int | |
| JP3503176B2 (en) * | 1994-03-31 | 2004-03-02 | Ｊｆｅスチール株式会社 | Hot metal dephosphorizer for injection |
| CN101302578B (en) * | 2008-06-27 | 2010-06-16 | 攀钢集团攀枝花钢铁研究院有限公司 | Composite vanadium extraction and dephosphorization agent for vanadium-containing molten iron and preparation thereof |
| CN103060512B (en) * | 2013-02-07 | 2014-04-02 | 武钢集团昆明钢铁股份有限公司 | Dephosphorizing and steelmaking method of medium-high-phosphorous semisteel by top-blown converter |
| 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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