CN108103270A - Calcium and magnesium base alumina-silica molten steel scavenger and preparation method thereof - Google Patents

Calcium and magnesium base alumina-silica molten steel scavenger and preparation method thereof Download PDF

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CN108103270A
CN108103270A CN201711399948.9A CN201711399948A CN108103270A CN 108103270 A CN108103270 A CN 108103270A CN 201711399948 A CN201711399948 A CN 201711399948A CN 108103270 A CN108103270 A CN 108103270A
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calcium
molten steel
magnesium
fritting
base
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CN108103270B (en
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陈来祥
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MAANSHAN ZHONGKE METALLURGICAL MATERIAL TECHNOLOGY Co Ltd
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MAANSHAN ZHONGKE METALLURGICAL MATERIAL TECHNOLOGY Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04Removing impurities by adding a treating agent
    • C21C7/06Deoxidising, e.g. killing

Abstract

The invention discloses a kind of calcium and magnesium base alumina-silica molten steel scavengers and preparation method thereof, belong to Metallic Materials Held In Shanghai field.The calcium and magnesium base alumina-silica molten steel scavenger of the present invention, is prepared, the mass fraction of component is by pre-melted type unsaturation calcium and magnesium fritting base-material with metallic aluminium, metallic silicon, calcium:CaO:35.7~50.6%, MgO:2.8~12.1%, Al2O3:8.2~29.1%, Al:7~35%, Si:0~8.7%, Ca:0~4.8%, surplus SiO2、Fe2O3, the impurity such as C, total impurities≤5.0%.The deoxidation products that is generated in purification of molten steel processing procedure and other deoxidation type inclusions of molten steel early period can be efficiently absorbed and be excluded with slag, nodularization denaturation treatment is carried out to the small brittle inclusion of only a few remnants simultaneously, it is fused solution slag system in purification of molten steel processing procedure, it is high to completely avoid the molten steel scavenger fusing point of former alundum (Al2O3) or calcium aluminate material and metallic aluminium mixing, lumps in purification of molten steel processing procedure, melt impermeable phenomenon.

Description

Calcium and magnesium base alumina-silica molten steel scavenger and preparation method thereof
Technical field
It is net more specifically to a kind of unsaturated calcium and magnesium base alumina-silica molten steel the invention belongs to Metallic Materials Held In Shanghai field Agent and preparation method thereof.
Background technology
Molten steel scavenger is a kind of metallurgical material used in steelmaking process on specific steel grade, is in steelmaking process So that the molten steel is reached certain quality requirement, generally require to add in molten steel scavenger molten steel is handled.Such as with aluminum deoxidier The molten steel of deoxidation is to use the molten steel scavenger mixed with alundum (Al2O3) or calcium aluminate material with metallic aluminium, the result is that right The product that molten steel carries out deoxidation is Al2O3And increase Als (dissolved aluminum) content in steel while deoxidation.Such purification of molten steel Agent has the defects of its is intrinsic, first, deoxidation products Al2O3Absorbing and eliminating is not easy, it is necessary to increase liquid steel refining process to reach clean The purpose of molten steel;Second is that slag system fusing point is high, 1500 DEG C or more are commonly reached, is not easy to exclude in purification of molten steel processing later stage slag, And slag is sticky, band iron is higher in slag system, adds the iron loss of steel-making;Third, the base-material of such cleanser is with list Only dispersed material mixes rather than pre-synthesis according to a certain ratio.In practical process, because molten steel high temperature and molten steel rush The difference of energy is stirred, makes its quenched effect unstable.
There are many presently disclosed molten steel scavengers, for example, Chinese Patent Application No. is:2007100123232, application is public Open day be the patent application document of on 2 4th, 2009 disclose a kind of metallurgical industry for desulfurization, deoxidation in STEELMAKING PRODUCTION, make The molten steel scavenger of slag --- aluminum calcareous slagging constituent.It is made of following raw materials according:Aluminium 45%, calcium carbonate mineral matter 30%, carbonization Silicon 5%, kaolin 10%, clinker 10%;Above-mentioned raw materials are granulated, granularity<Φ20mm.The aluminum calcareous slagging constituent exists Three-waste pollution is not generated in production process, can desulfurization, deoxidation, slag making, while carbon dioxide is generated in molten steel, it is this Slag class in molten steel can fully be taken to molten steel surface by gas when floating in molten steel, no slag inclusion phenomenon generates, so as to purify steel Water improves steel quality.
The characteristics of patent application is that calcium carbonate generates CO2Gas, which floats, removes impurity, this is only to bulky grain liquid impurities There is certain effect, the existing molten steel bottom argon blowing technology of removing that small solid-state is mingled with cannot all be solved, then calcium carbonate generates Small CO2Gas again can what be.Another feature be the slag making materials provided generally can only during smelting molten steel into Slag, and be directly added into endpoint molten steel and be difficult to slagging, in addition its slag system is using calcium silicates as pith, it is uniform to form melting The rare possibility of slag system.
For another example, Chinese Patent Application No. is:2009101045437, application publication date is the patent Shen on January 20th, 2010 Please file disclose a kind of deoxidation modification agent of molten steel, including following weight percentage components:Metal aluminum shot:Weight percent is 10~60%;Calcium aluminate refining agent:Weight percent is 35~80%;Addition of C aCO3:1~20%;Calcium aluminate refining agent by Al2O3It is formed with CaO, Al2O3Weight percent between CaO is between 0.8~3.5: 1~4.5.The molten steel of the invention takes off Oxygen modification agent solves the problems, such as the nozzle clogging of its welding rod steel production as deoxidation modification agent, is used for as top slag modifier Tapping process ladle top slag modifies and LF makes white slag deoxidization desulfuration, solves thin slab continuous casting and rolling low [Si], low [C] steel Production;It is produced using anhydrous binder compression moulding technique, product is in ellipsoid, and intensity is good, disclosure satisfy that high hopper Feed needs;Without free CaO, CaC2Etc. easy moisture absorption substance, storage time is long.
The characteristics of patent application is to add in calcium aluminate refining agent, and usual calcium aluminate refining agent is during liquid steel refining It is used as slag system, there is desulfurization, deoxidation.If the calcium aluminate (be free of free CaO) of saturation with Al in molten steel2O3Folder It is miscellaneous when colliding, it is impossible to regenerate calcium-aluminate etc and that absorption is caused to be mingled with is indifferent, molten steel is difficult to play purification and is made With.Another feature is using Al other deoxidiers containing Si to be substituted to carry out deoxidation to low Si steel grades, the result is that Al deoxidation products Al2O3It is mingled with, above-mentioned calcium aluminate refining agent again cannot be fully erased, adds harmful brittle inclusion to molten steel instead.
The content of the invention
1. it to solve the problems, such as
For existing molten steel scavenger, there are deoxidation products Al2O3It is not easy that absorbing and eliminating, treatment effect are unstable etc. to be lacked It falls into, a kind of new calcium and magnesium base alumina-silica molten steel scavenger of present invention offer, the calcium and magnesium fritting base-material in cleanser is unsaturated Pre-melted type is sintered, object is mutually uniform, therefore deoxidation products Al2O3Easily captured and absorbed by unsaturated calcium and magnesium fritting base-material, and it is right The other types of deoxidation products of molten steel such as calcium silicates class also has capture and adhesion, thus can effectively purify molten steel, improves The effect and stability of molten steel scavenger processing procedure.
Meanwhile the present invention provides a kind of method for preparing this calcium and magnesium base alumina-silica molten steel scavenger, according to certain ratio Example sintering fritting obtains unsaturated calcium and magnesium fritting base-material, is then mixed to scale with metallic aluminium, metallic silicon, calcium metal again It arrives.
2. technical solution
To solve the above-mentioned problems, the technical solution adopted in the present invention is as follows:
A kind of calcium and magnesium base alumina-silica molten steel scavenger, by pre-melted type unsaturation calcium and magnesium fritting base-material and metallic aluminium, metallic silicon, Calcium metal is prepared, and the mass fraction of component is:CaO:35.7~50.6%, MgO:2.8~12.1%, Al2O3:8.2~ 29.1%th, Al:7~35%, Si:0~8.7%, Ca:0~4.8%, surplus SiO2、Fe2O3, the impurity such as C, total impurities ≤ 5.0%.
Further, the pre-melted type unsaturation calcium and magnesium fritting base-material is by containing CaO materials and containing Al2O3Material and contain Mixed sintering fritting obtains MgO material in proportion, contains CaO in pre-melted type unsaturation calcium and magnesium fritting base-material:56.7~66.1%, MgO:4.1~16.2%, Al2O3:14.5~33.6%, surplus SiO2< 2.6%, Fe2O3< 1.9%, C < 4.5%, it is above-mentioned It is mass fraction.
Further, the material containing CaO is lime, CaO >=90%, SiO in the lime2≤ 3%, it is above-mentioned equal For mass fraction.
Further, it is described to contain Al2O3Material is bauxite, Al in the bauxite2O3>=88%, Fe2O3≤ 1.5%, above-mentioned is mass fraction.
Further, described containing MgO material is magnesia, MgO >=95%, SiO in the magnesia2≤ 2.2%, it is above-mentioned It is mass fraction.
Further, Si, Ca element are further included in the cleanser, element mass fraction is Si:0~8.7%, CaO:0 ~4.8%.
The preparation method of above-mentioned calcium and magnesium base alumina-silica molten steel scavenger, comprises the following steps:
(1) raw material lime and bauxite and magnesia are selected, is crushed respectively, fine grinding;
(2) dispensing, plus bonding agent in proportion, mixing, briquetting;
(3) briquetting is dried, and is put into sintering furnace and is sintered fritting, sintering prefusing temperature control is 1300~1400 DEG C;
(4) the unsaturated calcium and magnesium fritting base-material of fritting is crushed or levigate mixed with metallic aluminium powder, metallic silicon power, metallic calcium powder It closes;
(5) by above-mentioned mixture immediate component packaging or granulation or pressure ball.
Further, raw material is milled to grain size≤0.1mm in step (1).
Further, the bonding agent in step (2) by carboxymethyl cellulose and waterglass according to mass ratio (2-4):1 group Into.
The inherent shortcoming of existing alundum (Al2O3) or the molten steel scavenger of calcium aluminate and metallic aluminium mixing, such as:It is first, de- Oxygen product Al2O3Absorbing and eliminating is not easy, it is necessary to increase liquid steel refining process to achieve the purpose that purifying of steel;Second is that slag system fusing point Height commonly reaches 1500 DEG C or more, is not easy to exclude in purification of molten steel processing later stage slag and slag is sticky, band iron in slag system Amount is higher, adds the iron loss of steel-making;Third, the base-material of such cleanser is mixed according to a certain ratio with independent dispersed material It closes rather than pre-synthesis.In practical process, because molten steel high temperature and molten steel flush the difference of kinetic energy, make its quenched Effect is unstable.
The present invention provides a kind of new calcium and magnesium base alumina-silica molten steel scavenger, and superiority has:(1) molten steel scavenger takes off Oxygen product Al2O3Easily by the capture of unsaturated calcium and magnesium fritting base-material and absorption and to the other types of deoxidation products of molten steel such as silicic acid Calcium class also has capture and adhesion, thus can effectively purify molten steel.(2) there is nodularization change to a small number of remaining small brittle inclusions Property processing effect.(3) fusing point of calcium and magnesium base alumina-silica molten steel scavenger is in molten steel scavenger processing procedure at 1400 DEG C or so Be in a liquid state slag system, is easy to exclude, and reduces the iron loss in purification of molten steel processing procedure to greatest extent.(4) calcium and magnesium base alumina-silica Calcium and magnesium fritting base-material in molten steel scavenger is unsaturated sintering pre-melted type, and object is mutually uniform, effectively increases purification of molten steel The effect and stability of agent processing procedure.
3. advantageous effect
Compared with the prior art, beneficial effects of the present invention are:
(1) present invention uses fritting unsaturation calcium and magnesium fritting base-material to be generated for base-material in purification of molten steel processing procedure Deoxidation products and other deoxidation type inclusions of molten steel early period can be efficiently absorbed and be excluded with slag.
(2) calcium and magnesium base alumina-silica molten steel scavenger of the present invention is with the addition of metallic silicon, calcium for different steel grades, net in molten steel While change, there is the effect of nodularization denaturation treatment to remaining small brittle inclusion, optimize its purification of molten steel effect.
(3) present invention will contain CaO, MgO, Al2O3Associated materials are sintered fritting together, and design adjustment CaO, MgO, Al2O3Composition proportion between three makes it generate calcium-aluminate and calcium and magnesium aluminate unsaturation calcium and magnesium fritting base-material (containing trip From active CaO and MgO), which once runs into deoxidation products such as Al2O3Etc, that is, absorption and salt reaction of formation are generated, And these salts are to be in a liquid state and effectively float under liquid steel temperature, so as to effectively remove Al2O3The small solid inclusions of class, reach To the purpose of purification molten steel.
(4) calcium and magnesium base alumina-silica molten steel scavenger of the present invention is fused solution slag system in purification of molten steel processing procedure, complete It is high that the molten steel scavenger fusing point of former alundum (Al2O3) or calcium aluminate material and metallic aluminium mixing is avoided entirely, in purification of molten steel processing It lumps in the process, melt impermeable phenomenon.
(5) calcium and magnesium base alumina-silica molten steel scavenger of the present invention, rationally designs its amount containing Al, avoids deoxidation of molten steel With the unmatched problem of molten steel Als increments, reduce purification of molten steel needs the other control means taken in the process.
(6) calcium and magnesium base alumina-silica molten steel scavenger of the present invention to the index optimization and stabilization of purification of molten steel processing, is arranged simultaneously Slag is easy, iron loss is few, cost reduction.
(7) calcium and magnesium base alumina-silica molten steel scavenger of the present invention, because of its calcium and magnesium fritting base-material degree of unsaturation and metal aluminum content Precise spraying, and take the preparation process of sintering fritting, the fusing point of entire slag system made to control at 1400 DEG C or so, makes it net Change effect and stability is greatly improved.
Specific embodiment
The present invention is further described below with reference to specific embodiment.
Embodiment 1
Calcium and magnesium base alumina-silica molten steel scavenger, by pre-melted type unsaturation calcium and magnesium fritting base-material and metallic aluminium, metal silico-calcium system Standby to obtain, the mass fraction of component is:CaO:35.7%th, MgO:8.2%th, Al2O3:16.2%th, Al:22.4%th, Si: 8.7%, Ca:4.8%, surplus SiO2、Fe2O3, the impurity such as C, total impurities≤5.0%, wherein pre-melted type unsaturation calcium and magnesium Fritting base-material is by containing CaO materials and containing Al2O3Material and mixed sintering fritting obtains in proportion containing MgO material, material containing CaO is Lime, CaO >=90%, SiO in the lime2≤ 3%, containing Al2O3Material is bauxite, Al in the bauxite2O3>=88%, Fe2O3≤ 1.5%, it is magnesia containing MgO material, MgO >=95%, SiO in magnesia2≤ 2.2%, above-mentioned is mass fraction.This reality It applies in the pre-melted type unsaturation calcium and magnesium fritting base-material in example and contains CaO:55.7%, MgO:12.8%, Al2O3:25.3%, surplus For SiO2< 2.6%, Fe2O3< 1.9%, C < 4.5%, SiO2、Fe2O3, the total impurity levels of C be no more than 6.2%, it is above-mentioned to be Mass fraction.
Molten steel scavenger is prepared in accordance with the following methods:
(1) raw material lime and bauxite and magnesia are selected, crushes respectively, fine grinding, makes grain size≤0.1mm;
(2) (bonding agent is by carboxymethyl cellulose and waterglass according to mass ratio 2 for dispensing plus bonding agent in proportion:1 group Into), mixing, briquetting;
(3) briquetting is dried, and is put into sintering furnace and is sintered fritting, when sintering is first warming up to 800 DEG C or so, heat preservation 1.5 Hour, the crystallization water and volatile impurity are removed, 1300 DEG C or so is then heated to, when sintering 1.5 is small, obtains fritting not Saturation calcium and magnesium fritting base-material;
(4) the unsaturated calcium and magnesium fritting base-material of fritting is crushed or levigate mixed with metallic aluminium powder, metal silicon calcium powder;
(5) by above-mentioned mixture immediate component packaging or granulation or pressure ball.
Each composition quality fraction for the molten steel scavenger being finally prepared is:CaO:35.7%, MgO:8.2%, Al2O3: 16.2%, Al:22.4%, Si:8.7%, Ca:4.8%, SiO2:0.6%, Fe2O3:1.1%, C:1.7%, surplus for some not Evitable impurity, for 120 tons of BOF nominal capacity, steel grade:Q390D, after the purified processing of molten steel, ingredient:C: 0.19%th, Si:0.47%th, Mn:1.58%th, S:0.022%th, P:0.020%th, Als:0.017%, surplus Fe.Compare it DNA vaccine improves 26% than the molten steel scavenger that alundum (Al2O3) is mixed with metallic aluminium, and Als increments improve 16% in steel, are pressed from both sides in steel The miscellaneous total amount range of decrease improves 45%, and the comprehensive cost of purification of molten steel processing reduces by 21% than former technique.
Embodiment 2
Calcium and magnesium base alumina-silica molten steel scavenger, by pre-melted type unsaturation calcium and magnesium fritting base-material and metallic aluminium, metal silico-calcium system Standby to obtain, the mass fraction of component is:CaO:37.8%th, MgO:9.1%th, Al2O3:8.2%th, Al:35%th, Si:4.9%, Ca:2.6%, surplus SiO2、Fe2O3, the impurity such as C, total impurities≤5.0%, wherein pre-melted type unsaturation calcium and magnesium fritting base Material is by containing CaO materials and containing Al2O3Material and mixed sintering fritting obtains in proportion containing MgO material, material containing CaO are lime, should CaO >=90% in lime, SiO2≤ 3%, containing Al2O3Material is bauxite, Al in the bauxite2O3>=88%, Fe2O3≤ 1.5%, it is magnesia containing MgO material, MgO >=95%, SiO in magnesia2≤ 2.2%, above-mentioned is mass fraction.In the present embodiment Pre-melted type unsaturation calcium and magnesium fritting base-material in contain CaO:66.1%, MgO:16.2%, Al2O3:14.5%, surplus SiO2 < 2.6%, Fe2O3< 1.9%, C < 4.5%, SiO2、Fe2O3, the total impurity levels of C be no more than 3.2%, above-mentioned is quality point Number., molten steel scavenger is prepared in accordance with the following methods:
(1) raw material lime and bauxite are selected, crushes respectively, fine grinding, makes grain size≤0.1mm;
(2) (bonding agent is by carboxymethyl cellulose and waterglass according to mass ratio 3 for dispensing plus bonding agent in proportion:1 group Into), mixing, briquetting;
(3) briquetting is dried, and is put into sintering furnace and is sintered fritting, when sintering is first warming up to 900 DEG C or so, and heat preservation 1 is small When, the crystallization water and volatile impurity are removed, 1350 DEG C or so is then heated to, when sintering 1 is small, obtains the unsaturation of fritting Calcium and magnesium fritting base-material;
(4) the unsaturated calcium and magnesium fritting base-material of fritting is crushed or levigate mixed with metallic aluminium powder, metal silicon calcium powder;
(5) by above-mentioned mixture immediate component packaging or granulation or pressure ball.
Each composition quality fraction for the molten steel scavenger being finally prepared is:CaO:37.8%th, MgO:9.1%th, Al2O3: 8.2%th, Al:35%th, Si:4.9%, Ca:2.6%, SiO2:0.4%, Fe2O3:0.8%, C:1.2%, surplus can not for some The impurity avoided, for 300 tons of BOF nominal capacity, steel grade:HR355F, after the purified processing of molten steel, ingredient:C: 0.10%th, Si:0.41%th, Mn:1.17%th, S:0.010%th, P:0.013%th, Als:0.019%, surplus Fe.Compare it DNA vaccine improves 29% than the molten steel scavenger that calcium aluminate is mixed with metallic aluminium, and Als increments improve 28% in steel, are mingled in steel total It measures the range of decrease and improves 33%, the comprehensive cost of purification of molten steel processing reduces by 26% than former technique.
Embodiment 3
Calcium and magnesium base alumina-silica molten steel scavenger, by pre-melted type unsaturation calcium and magnesium fritting base-material and metallic aluminium and metal silico-calcium system Standby to obtain, the mass fraction of component is:CaO:49.2%th, MgO:4.8%th, Al2O3:29.1%th, Al:7%th, Si:3.8%, Ca:2.6%, surplus SiO2、Fe2O3, the impurity such as C, total impurities≤5.0%, wherein pre-melted type unsaturation calcium and magnesium fritting base Material is by containing CaO materials and containing Al2O3Material and mixed sintering fritting obtains in proportion containing MgO material, material containing CaO are lime, should CaO >=90% in lime, SiO2≤ 3%, containing Al2O3Material is bauxite, Al in the bauxite2O3>=88%, Fe2O3≤ 1.5%, it is magnesia containing MgO material, MgO >=95%, SiO in magnesia2≤ 2.2%, above-mentioned is mass fraction.In the present embodiment Pre-melted type unsaturation calcium and magnesium fritting base-material in contain CaO:56.7%, Al2O3:33.6%, MgO:5.4%, surplus SiO2< 2.6%, Fe2O3< 1.9%, C < 4.5%, SiO2、Fe2O3, the total impurity levels of C be no more than 4.3%, above-mentioned is mass fraction.
Molten steel scavenger is prepared in accordance with the following methods:
(1) raw material lime and bauxite and magnesia are selected, crushes respectively, fine grinding, makes grain size≤0.1mm;
(2) (bonding agent is by carboxymethyl cellulose and waterglass according to mass ratio 4 for dispensing plus bonding agent in proportion:1 group Into), mixing, briquetting;
(3) briquetting is dried, and is put into sintering furnace and is sintered fritting, when sintering is first warming up to 850 DEG C or so, heat preservation 1.5 Hour, the crystallization water and volatile impurity are removed, 1400 DEG C or so is then heated to, when sintering 2 is small, obtains the insatiable hunger of fritting With calcium and magnesium fritting base-material;
(4) the unsaturated calcium and magnesium fritting base-material of fritting is crushed or levigate mixed with metallic aluminium powder, metal silicon calcium powder;
(5) by above-mentioned mixture immediate component packaging or granulation or pressure ball.
Each composition quality fraction for the molten steel scavenger being finally prepared is:CaO:49.2%th, MgO:4.7%th, Al2O3: 29.1%th, Al:7%th, Si:3.8%, Ca:2.6%, SiO2:0.5%, Fe2O3:0.7%, C:1.1%, surplus can not for some The impurity avoided, for 150 tons of BOF nominal capacity, steel grade:ML15, after the conditioned processing of molten steel, ingredient:C:0.15%th, Si:0.08%th, Mn:0.47%th, S:0.021%th, P:0.024%th, Als:0.023%, surplus Fe.Compare its DNA vaccine ratio The molten steel scavenger that alundum (Al2O3) is mixed with metallic aluminium improves 33%, and Als increments improve 23% in steel, and total inclusion content drops in steel Width improves 37%, and the comprehensive cost of purification of molten steel processing reduces by 32% than former technique.
Embodiment 4
Calcium and magnesium base alumina-silica molten steel scavenger, by pre-melted type unsaturation calcium and magnesium fritting base-material and metallic aluminium and metal silico-calcium system Standby to obtain, wherein pre-melted type unsaturation calcium and magnesium fritting base-material is by containing CaO materials and containing Al2O3It material and is mixed in proportion containing MgO material It closes sintering fritting to obtain, material containing CaO is lime, CaO >=90%, SiO in the lime2≤ 3%, containing Al2O3Material is aluminium alum Soil, Al in the bauxite2O3>=88%, Fe2O3≤ 1.5%, it is magnesia containing MgO material, MgO >=95%, SiO in magnesia2≤ 2.2%, above-mentioned is mass fraction.Contain CaO in pre-melted type unsaturation calcium and magnesium fritting base-material in the present embodiment:60.6%, Al2O3:20.8%, MgO:14.5%, surplus SiO2< 2.6%, Fe2O3< 1.9%, C < 4.5%, SiO2、Fe2O3, C it is total Impurity level is no more than 4.1%, and above-mentioned is mass fraction.
Calcium and magnesium base alumina-silica molten steel scavenger in the present embodiment, composition quality fraction are:CaO:50.6%, MgO: 12.1%, Al2O3:17.4%, Al:12.8%, Si:2.4%, Ca:1.3%, SiO2:0.9%, Fe2O3:0.6%, C:1.2%, Surplus is some inevitable impurity, for 90 tons of BOF nominal capacity, steel grade:Q345FRD, after the purified processing of molten steel, Its ingredient:C:0.16%th, Si:0.49%th, Mn:1.52%th, S:0.02%th, P:0.021%th, Als:0.017%, surplus Fe. The molten steel scavenger that its DNA vaccine is mixed with metallic aluminium than alundum (Al2O3) that compares improves 27%, and Als increments improve in steel 19%, the total inclusion content range of decrease improves 34% in steel, and the comprehensive cost of purification of molten steel processing is than former technique reduction by 28%.
Embodiment 5
Calcium and magnesium base alumina-silica molten steel scavenger, by pre-melted type unsaturation calcium and magnesium fritting base-material and metallic aluminium and metal silico-calcium system Standby to obtain, wherein pre-melted type unsaturation calcium and magnesium fritting base-material is by containing CaO materials and containing Al2O3It material and is mixed in proportion containing MgO material It closes sintering fritting to obtain, material containing CaO is lime, CaO >=90%, SiO in the lime2≤ 3%, containing Al2O3Material is aluminium alum Soil, Al in the bauxite2O3>=88%, Fe2O3≤ 1.5%, it is magnesia containing MgO material, MgO >=95%, SiO in magnesia2≤ 2.2%, above-mentioned is mass fraction.Contain CaO in pre-melted type unsaturation calcium and magnesium fritting base-material in the present embodiment:64.2%, Al2O3:28.3%, MgO:4.1%, surplus SiO2< 2.6%, Fe2O3< 1.9%, C < 4.5%, SiO2、Fe2O3, C it is total Impurity level is no more than 3.4%, and above-mentioned is mass fraction.
Calcium and magnesium base alumina-silica molten steel scavenger in the present embodiment, composition quality fraction are:CaO:44.5%, MgO: 2.8%, Al2O3:19.5%, Al:30.6%, SiO2:0.8%, Fe2O3:1.2%, C:0.5%, surplus is inevitable for some Impurity, for 100 tons of electric furnace nominal capacity, steel grade:06Cr13Al, after the purified processing of molten steel, ingredient:C:0.07%th, Si:0.78%th, Mn:0.82%th, S:0.023%th, P:0.03%th, Cr:13.2%th, Als:0.21%, surplus Fe.Compare it DNA vaccine improves 23% than the molten steel adjusting material that calcium aluminate is mixed with metallic aluminium, and Als increments improve 25% in steel, are mingled in steel total It measures the range of decrease and improves 29%, the comprehensive cost of purification of molten steel processing reduces by 34% than former technique.

Claims (8)

1. a kind of calcium and magnesium base alumina-silica molten steel scavenger, it is characterised in that:By pre-melted type unsaturation calcium and magnesium fritting base-material and metal Aluminium, metallic silicon, calcium metal are prepared, and the mass fraction of component is:CaO:35.7~50.6%, MgO:2.8~12.1%, Al2O3:8.2~29.1%, Al:7~35%, Si:0~8.7%, Ca:0~4.8%, surplus SiO2、Fe2O3, the impurity such as C, Its total impurities≤5.0%.
2. calcium and magnesium base alumina-silica molten steel scavenger according to claim 1, it is characterised in that:The pre-melted type is unsaturated Calcium and magnesium fritting base-material is by containing CaO materials and containing Al2O3Material and mixed sintering fritting obtains in proportion containing MgO material, pre-melted type is not Contain CaO in saturation calcium and magnesium fritting base-material:56.7~66.1%, Al2O3:14.5~33.6%, MgO:4.1~16.3%, surplus For SiO2< 2.6%, Fe2O3< 1.9%, C < 4.5%, above-mentioned is mass fraction.
3. calcium and magnesium base alumina-silica molten steel scavenger according to claim 2, it is characterised in that:The material containing CaO is Lime, CaO >=90%, SiO in the lime2≤ 3%, above-mentioned is mass fraction.
4. calcium and magnesium base alumina-silica molten steel scavenger according to claim 2, it is characterised in that:Described contains Al2O3Material is Bauxite, Al in the bauxite2O3>=88%, Fe2O3≤ 1.5%, above-mentioned is mass fraction.
5. calcium and magnesium base alumina-silica molten steel scavenger according to claim 2, it is characterised in that:Described is containing MgO material Magnesia, MgO >=95%, SiO in the magnesia2≤ 2.2%, above-mentioned is mass fraction.
6. the preparation method of the calcium and magnesium base alumina-silica molten steel scavenger in Claims 1 to 5 described in any one, including following step Suddenly:
(1) raw material lime and bauxite and magnesia are selected, is crushed respectively, fine grinding;
(2) dispensing, plus bonding agent in proportion, mixing, briquetting;
(3) briquetting is dried, and is put into sintering furnace and is sintered fritting, sintering prefusing temperature control is 1300~1400 DEG C, is obtained The unsaturated calcium and magnesium fritting base-material of fritting;
(4) the unsaturated calcium and magnesium fritting base-material of fritting is crushed or levigate mixed with metallic aluminium powder, metallic silicon power, metallic calcium powder;
(5) by above-mentioned mixture immediate component packaging or granulation or pressure ball.
7. the preparation method of calcium and magnesium base alumina-silica molten steel scavenger according to claim 6, it is characterised in that:Step (1) It is middle that raw material is milled to grain size≤0.1mm.
8. the preparation method of calcium and magnesium base alumina-silica molten steel scavenger according to claim 6, it is characterised in that:Step (2) In bonding agent by carboxymethyl cellulose and waterglass according to mass ratio (2-4):1 composition.
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