CN101173323A - Multifunctional slagging material findings and method for producing the same - Google Patents

Multifunctional slagging material findings and method for producing the same Download PDF

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Publication number
CN101173323A
CN101173323A CNA2007102025075A CN200710202507A CN101173323A CN 101173323 A CN101173323 A CN 101173323A CN A2007102025075 A CNA2007102025075 A CN A2007102025075A CN 200710202507 A CN200710202507 A CN 200710202507A CN 101173323 A CN101173323 A CN 101173323A
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slag
additive
slagging
bessemer furnace
feo
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CN101173323B (en
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陈坤
黄正全
张珉
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Pangang Group Chengdu Iron & Steel Co Ltd
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Pangang Group Chengdu Iron & Steel Co Ltd
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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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

The invention relates to a plurality of assistant materials of slagging materials and a preparation method, belonging to metallurgy field, which is characterized in comprising the components in the following weight matching: steel slag of converter 8.0 to 9.5 shares and addition agent 0.5 to 2 shares; wherein, the addition agent comprises the components in the following weight percentage: Na2CO3 is 5.00 to 10.00 percent, FeO is 70.00 to 80.00 percent and BaCO3 is 10.00 to 20.00 percent. The assistant materials of slagging materials can be used in slagging and also used as slugging agent and dephosphorizing agent. The invention achieves the recycle utilization of the steel slag of converter, therefore has the advantages of lowering the amount of waste slag during steel-making, saving the dosages of current slagging material: lime and dolomite and improving the slagging performance, and also has the advantages of slagging rapid, sludging rapid and dephosphorizing effectively. The invention provides a new method to recycle the steel slag of converter for people.

Description

Multifunctional slagging material findings and preparation method thereof
Technical field
The present invention relates to multifunctional slagging material findings and preparation method thereof, belong to field of metallurgy.
Background technology
Bessemer furnace slag is one of Iron And Steel Industry " three wastes ", and it contains a certain amount of steel scrap and CaO, FeO, useful component resources such as SiO2, MgO, and it is thrown aside in the slag field, has not only wasted resource, has also taken a large amount of soils and has caused environmental pollution.With the bessemer furnace slag Returning utilization, can reduce steelworks waste total amount, and save a large amount of slag making materialses, therefore, the comprehensive utilization of bessemer furnace slag has been included into the important step of steel industry recycling economy development.
At present, the comprehensive utilization ratio of China's bessemer furnace slag only is 36%, and is main as reclaiming slag iron, metallurgical raw material, material of construction and being used for aspect such as the pre-desiliconizing and dephosphorizing of molten iron.
Tangshan Iron and Steel Co adopts the technology of " slag hot application (dropping hammer)-autogenous grinding-magnetic separation " to be used to handle slag, and the magnetic material after the magnetic separation is used for sintering, and non magnetic composition is used to repair the roads, to reach the processing and utilizing of slag.(article source Tang's steel converter slag treatment process technology and effect, the long pretty Gao Yuying of Wang Ji, Hebei metallurgy, 1994 (1) 24-27 of winning of rice steamer).But existing research and report mostly are the elementary utilization of bessemer furnace slag, not really as a kind of material use efficiently.
Summary of the invention
Technical problem solved by the invention is to provide a kind of new scorification material supplementary material, effectively utilizes bessemer furnace slag, reduces waste sludge discharge.
Multifunctional slagging material findings of the present invention is by adding the component content in the additive adjustment slag in bessemer furnace slag, FeO content is increased, and add the component preparation with dephosphorizing and get, this scorification material supplementary material can be used as dissolving agent and dephosphorizing agent use.
Scorification material supplementary material of the present invention contains following components in weight percentage: 8.0～9.5 parts of bessemer furnace slags, 0.5～2.0 part of additive; Wherein, additive contains the component of following weight per-cent: Na 2CO 35.00～10.00%, FeO 70.00～80.00%, BaCO 310.00～20.00%.The scorification material supplementary material for preparing and get contains following components in weight percentage: CaO32.00～45.00%, FeO 20.00～30.00%, BaCO 31.00 SiO～4.00%, 27.00～12.00%, MgO 7.00～9.00%, Na 2CO 30.5～2.00%.
Converter steelmaking slag making materials commonly used is generally lime and rhombspar.The iron protoxide that bessemer furnace slag contains in the scorification material supplementary material of the present invention can provide certain oxygen position, calcium oxide, silicon-dioxide use as alkaline agent, especially the bessemer furnace slag fritting in the scorification material supplementary material of the present invention, scorification material supplementary material of the present invention has following effects:
1, because not molten solid oxide calcium (CaO), solid oxide magnesium (MgO), the free cao (Ca that contains in the scorification material supplementary material of the present invention 2+) and free oxidation magnesium (Mg 2+) be the active principle of slag making materials, so can be used for slag making.
2, use as dissolving agent: because the bessemer furnace slag fusing point low (being about 1320 ℃) of one of raw material of the present invention, add as the slag making materials of fritting, advance stove after burn-off rate fast, can quicken the chemical reaction in molten bath; In addition, SiO2 in the bessemer furnace slag and FeO are effective flux of lime and rhombspar, can improve the slagging speed at initial stage.
3, use as dephosphorizing agent: behind additive, the content of FeO increases in bessemer furnace slag, and the oxygen position of bessemer furnace slag is increased, and makes the molten bath violent agitation, the carrying out of impelling early stageization slag.The requirement lucky and dephosphorizing agent of calcium oxide content and pre-fusibleness matches, and further improves the partition ratio of phosphorus in scorification material supplementary material, improves the dephosphorization effect of scorification material supplementary material of the present invention.
Bessemer furnace slag added make scorification material supplementary material behind the additive and have multiple effect, realized the recycle of bessemer furnace slag, not only reduce steel-making waste total amount, also can save the consumption of existing slag making materials lime and rhombspar, and the characteristics of its quick slagging, rapid slag and high efficiency dephosphorating have been given full play to, improve the slag making performance, a kind of method of new recycle bessemer furnace slag is provided for the public.
Embodiment
Scorification material supplementary material of the present invention is characterized in that: it is made up of following components in weight percentage: 8.0～9.5 parts of bessemer furnace slags, 0.5～2.0 part of additive; Wherein, described additive is made up of the component of following weight per-cent: Na 2CO 35.00～10.00%, FeO 70.00～80.00%, BaCO 310.00～20.00%; The slag making materials for preparing and get contains the component of following weight per-cent: CaO 32.00～45.00%, FeO 20.00～30.00%, BaCO 31.00 SiO～4.00%, 27.00～12.00%, MgO 7.00～9.00%, Na 2COx 0.5～2.00%.
Na in the additive of the present invention 2CO 3, BaCO 3Effect with dephosphorization, FeO provides the oxygen position, and the effect of dephosphorization is also arranged simultaneously, and the additive that the present invention uses is comprehensively brought into play dephosphorization, is changed the effect of slag, is a kind of new high-quality scorification material supplementary material.
Scorification material supplementary material of the present invention is that it comprises the steps: by following method preparation
A, get bessemer furnace slag, fragmentation;
B, take off and state weight percent and take by weighing additive Na 2CO 35.00～10.00%, FeO 70.00～80.00%, BaCO 310.00～20.00%;
C, mix bessemer furnace slag and additive promptly: 8.0～9.5 parts of bessemer furnace slags, 0.5～2.0 part of additive according to the following weight proportioning.
In order to guarantee the flowability of scorification material supplementary material in smelting transport process, it is mixed, be spherical preferably with bessemer furnace slag and additive preparation, as can be with bessemer furnace slag, fragmentation, screening, making its particle diameter after the mixing is 5～30mm, and additive is made the spheroid that particle diameter is 5～30mm.The bessemer furnace slag particle diameter generally is to use for iron making and sintering less than 5mm.
Obviously, according to foregoing of the present invention,,, can also make modification, replacement or the change of other various ways not breaking away under the above-mentioned basic fundamental thought of the present invention prerequisite according to the ordinary skill knowledge and the customary means of this area.
Form by the following examples is described in further detail foregoing of the present invention again.But this should be interpreted as that the scope of the above-mentioned theme of the present invention only limits to following example.All technology that realizes based on foregoing of the present invention all belong to scope of the present invention.
The bessemer furnace slag that is adopted among the embodiment is that the first slag of 30 tons of converters and finishing slag are all collected, and about 400 tons, the block slag through being processed into 5～30mm uses for test, and is on-the-spot respectively at 12 some samplings, is divided into two groups of processing and analyzes, and its composition sees Table 1.
Table 1 bessemer furnace slag composition (weight percent %)
Specimen coding SiO 2 FeO CaO MgO MnO P 2O 5 TiO 2 TFe
Piece sample 1 11.04 16.75 38.70 10.99 3.44 0.751 2.33 23.73
Piece sample 2 9.83 15.84 43.60 11.29 3.12 0.709 2.25 24.14
The scorification material supplementary material preparation method is as follows:
1, bessemer furnace slag is collected with the slag basin, the cooling of spraying water on a small quantity of the red slag of overturning is treated to carry out fragmentation, screening after slag cools off, and being processed into lumpiness is the block slag of 5～30mm;
2, additive is made the ball of 10～30mm, and additive is made up of the component of following weight per-cent: Na 2CO 35.00～10.00%, FeO 70.00～80.00%, BaCO 310.00～20.00%;
3, with bessemer furnace slag and additive in 8.0～9.5: 0.5～2.0 ratio is promptly made scorification material supplementary material by mechanically mixing.
The contriver uses above-mentioned scorification material supplementary material and makes steel test, and the consumption of bessemer furnace slag and additive all adopts above-mentioned preparation method's amount ranges, and 121 stoves have been carried out in test altogether, 20 stoves of taking a sample, and every day first, the stove sample was former technology control sample.
Former process for making is according to 30 tons of converter meters:
1. 30 tons of converter steelmaking slag charges are with addition of amount
Lime adding amount is 1000kg, rhombspar add-on 1000kg.
2. slag charge adding method
Open to blow and added 500～700kg lime, 1000kg rhombspar in 0～3 minute; (lime: 300～500kg) catch carbons added the residue slag charge in preceding 3 minutes.
3. the catch carbon temperature is controlled to be: 1580～1640 ℃; The catch carbon time is controlled to be: 10～12 minutes.
4. terminal temperature is controlled to be: 1680～1750 ℃ of straight carbon steels, low alloy steel are 1690～1750 ℃.
Output of steel is about 30～35 tons/stove.
The process for making of using scorification material supplementary material of the present invention is:
1. 30 tons of converter steelmaking slag charges are with addition of amount
Scorification material supplementary material of the present invention is added by every stove 500～600kg, and lime adding amount is 700～800kg, rhombspar add-on 850～900kg.
2. slag charge adding method
Open to blow and add lime 300～500kg simultaneously, rhombspar 400～600kg and 200kg scorification material supplementary material of the present invention; Open blow 3～5min after, add scorification material supplementary material 300～400kg of the present invention, (lime 200～500kg, rhombspar 250～500kg) catch carbons added all the other slag charges in preceding 3 minutes.
Output of steel is about 30～35 tons/stove.
Blast-melted composition sees Table 2.
The blast-melted composition of table 2 (weight percent %)
Continuous table 2
Figure A20071020250700081
* the data of ruling are former technology correlation data
Table 3 converter Intake Quantity and scorification material supplementary material consumption (ton)
Figure A20071020250700082
Continuous table 3
Figure A20071020250700091
Annotate: the line data are former technology correlation data
From table 3, at duration of test, the Intake Quantity of every day is approaching substantially, adds multifunctional slagging material findings smelting technology and former smelting technology relatively, and the consumption homogeneous phase of lime, rhombspar should reduce to some extent.
This test endpoint composition and temperature see Table 4, as seen add the smelting technology of multifunctional efficient scorification material supplementary material, and the Molten Steel over-oxidation heat reduces greatly, have obtained tangible dephosphorization effect.
Table 4 terminal point composition and temperature
Figure A20071020250700092
Continuous table 4
Figure A20071020250700101
Annotate: the line data are former technology correlation data
Table 5 final slag composition (by weight percentage)
Figure A20071020250700102
Continuous table 5
Figure A20071020250700111
Annotate: the line data are former technology correlation data
The smelting technology and the conventional smelting technology dephosphorization rate that add multi-functional efficient scorification material supplementary material see Table 6.
Table 6 dephosphorization rate
Figure A20071020250700112
Continuous table 6
Figure A20071020250700121
Annotate: the line data are former technology correlation data
In scorification material supplementary material of the present invention, add 7.00% additive in the experiment, as seen from Table 6, compare two kinds of technologies, the average dephosphorization rate of conventional smelting technology is 79.95%, add that the average dephosphorization rate of smelting technology is 88.35% behind the scorification material supplementary material of the present invention, average dephosphorization rate has improved 8.40%.
The average content of TFe, FeO sees Table 7 in the slag after duration of test is smelted.
The average content of TFe, FeO (by weight percentage) in table 7 slag
Figure A20071020250700131
As seen from Table 7, in 30 tons of bessemer furnace slags, add additive and smelt, not only can improve average dephosphorization rate, also can make TFe reduction by 3.00～5.00% in the slag, promptly reduce to blow and decrease about 0.50%.From table 7 analytical results, conventional smelting technology FeO (14.73～22.14%), TFe (20.55～25.50%), add scorification material supplementary material smelting technology FeO of the present invention (13.19～16.92%), TFe (17.13～19.28%), and two kinds of technology Intake Quantity amount of lime basic identical, that add are also basic identical, illustrate that the smelting technology that adds scorification material supplementary material of the present invention is better than the saturating situation of the change of conventional smelting technology slag, steady, the no splash of the omnidistance smelting of smelting technology.
The direct economic benefit of using scorification material supplementary material of the present invention derives from recovery rate of iron and improves, and the reduction of lime, rhombspar consumption.
1. recovery rate of iron improves 0.30%: i.e. the ton steel a=6.00 unit/ton steel that reduces cost;
2. lime, rhombspar consumption reduce: i.e. ton steel b=3.50 unit/ton steel+1.50 yuan/ton steel=5.00 yuan/ton steel that reduces cost;
3. scorification material supplementary material process cost of the present invention: c=2.00 unit/ton steel;
4. additive expense: d=4.00 unit/ton steel.
More than add up to steel of every production can save 5.00 yuan, method of calculation are a+b-c-d.
In sum,, not only reduced lime, rhombspar consumption, saved social resources, and reduced the waste total amount by the recycle of bessemer furnace slag.

Claims (7)

1. multifunctional slagging material findings, it is characterized in that: it contains following components in weight percentage:
8.0～9.5 parts of bessemer furnace slags, 0.5～2.0 part of additive;
Wherein, described additive contains the component of following weight per-cent: Na 2CO 35.00～10.00%, FeO 70.00～80.00%, BaCO 310.00～20.00%.
2. multifunctional slagging material findings according to claim 1, it is characterized in that: it is made up of following components in weight percentage:
8.0～9.5 parts of bessemer furnace slags, 0.5～2.0 part of additive;
Wherein, described additive is made up of the component of following weight per-cent: Na 2CO 35.00～10.00%, FeO70.00～80.00%, BaCO 310.00～20.00%.
3. multifunctional slagging material findings according to claim 1 is characterized in that: it contains the component of following weight per-cent: CaO 32.00～45.00%, FeO 20.00～30.00%, BaCO 31.00 SiO～4.00%, 27.00～12.00%, MgO 7.00～9.00%, Na 2CO 30.5～2.00%.
4. prepare the method for the described multifunctional slagging material findings of claim 2, it is characterized in that: it comprises the steps:
A, get bessemer furnace slag, fragmentation;
B, take off and state weight percent and take by weighing additive: Na 2CO 35.00～10.00%, FeO 70.00～80.00%, BaCO 310.00～20.00%;
C, mix bessemer furnace slag and additive promptly: 8.0～9.5 parts of bessemer furnace slags, 0.5～2.0 part of additive according to the following weight proportioning.
5. preparation method according to claim 4 is characterized in that: with converter slag crushing in the steps A to particle diameter is 5～30mm.
6. preparation method according to claim 4 is characterized in that: it is 5～30mm that the described additive of step B is made particle diameter.
7. preparation method according to claim 4 is characterized in that: the bessemer furnace slag described in the steps A is that particle diameter is the spheroid of 5～30mm; Additive described in the step B is that particle diameter is the spheroid of 5～30mm.
CN2007102025075A 2007-11-13 2007-11-13 Multifunctional slagging material findings and method for producing the same Expired - Fee Related CN101173323B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103031399A (en) * 2012-05-31 2013-04-10 新疆八一钢铁股份有限公司 Method for converter slagging regulation production
CN103215408A (en) * 2013-04-28 2013-07-24 山东广富集团有限公司 Method for converter steelmaking by adding steel slag blocks
CN105112598A (en) * 2015-09-29 2015-12-02 山东钢铁股份有限公司 Method for converter steelmaking by directly using bottom slag produced by converter

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103031399A (en) * 2012-05-31 2013-04-10 新疆八一钢铁股份有限公司 Method for converter slagging regulation production
CN103215408A (en) * 2013-04-28 2013-07-24 山东广富集团有限公司 Method for converter steelmaking by adding steel slag blocks
CN103215408B (en) * 2013-04-28 2015-10-28 山东广富集团有限公司 A kind ofly add the method that slag block carries out converter steelmaking
CN105112598A (en) * 2015-09-29 2015-12-02 山东钢铁股份有限公司 Method for converter steelmaking by directly using bottom slag produced by converter

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