CN1333381A - Composite slag melting agent for steelmaking - Google Patents
Composite slag melting agent for steelmaking Download PDFInfo
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- CN1333381A CN1333381A CN 00109905 CN00109905A CN1333381A CN 1333381 A CN1333381 A CN 1333381A CN 00109905 CN00109905 CN 00109905 CN 00109905 A CN00109905 A CN 00109905A CN 1333381 A CN1333381 A CN 1333381A
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- steel
- slag
- fluorite
- steelmaking
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Abstract
The compound slag-transforming agent for smelting steel is characterized by that the composition of said slag-transforming agent is made of (wt%) fluorite 0-20%, FeO 25-50%, steel smelting sludge 20-40 % and additive 6-12%. Said invention can make molten steel and circulating water of dust-removing system contain less fluoride in the course of transforming slag, can prolong the service life of furnace stack lining, raise steelmaking rate and can reduce environmental pollution.
Description
The invention belongs to the field of smelting of steel, particularly a kind of compound slagging agent that can improve the smelting recovery rate.
Along with the carrying out of smelting, the fusing point of slag, flowability and slag steel interface constantly change in steelmaking process, and therefore the process of steel-making is the process of refining slag.In refining slag process, often change slag simultaneously, so that smelting iron and steel carries out as early as possible.Normally used dissolving agent mainly contains fluorite, Wingdale etc.Because the main component of fluorite is CaF
2, its content of fluoride height has following shortcoming (1). and etch damages bigger to furnace lining greatly to the steel-making furnace lining; (2). in blowing carbon drop process since the superoxide that produces make more steel to be smelt rate low; (3). the fluorine content height of dust-removal system recirculated water, surpass environmental protection standard, cause environmental pollution.
Purpose of the present invention provides a kind of composite slag melting agent for steelmaking.It makes molten steel and dust-removal system recirculated water fluoride few in changing the slag process, can prolong the work-ing life of furnace lining, improves and is smelt rate, and can reduce environmental pollution.
For reaching above-mentioned purpose, the invention is characterized in the consisting of of dissolving agent (below be weight percentage): fluorite 0～20%; FeO25～50%; Steel-smelting sewage sludge 20～40%; Additive 6～12%; The weight percent sum of above-mentioned substance and additive and impurity is absolutely.
Additive is made up of toughener, wedding agent, water reducer, magnesium powder.
Fluorite is a low melting point in the mentioned component of the present invention, and when lesser temps, very fast formation low melting point silicate adds a spot of being beneficial to of fluorite slag in dissolving agent; FeO has the effect of dilution slag, forms calcium ferrite, and at the bottom of its fusing point, the facilitation slag has the effect that replaces fluorite; Mud itself contains FeO and metallic iron, owing to the reductive action of FeO, can increase the rate that is smelt of steel, and mud also has the effect of bonding FeO and fluorite in addition, can make the dissolving agent balling-up, is not taken out of by the flue gas of the rising in the steel melting furnace when going into stove to guarantee dissolving agent; The adding of additive can be accelerated the rate of drying of dissolving agent balling-up at normal temperatures, increases the intensity of dissolving agent; Replace fluorite as dissolving agent with this dissolving agent, the fluorite consumption is significantly reduced, can make that content of fluoride reduces greatly in the molten steel, reduce, prolong the work-ing life of furnace lining the etch of steel-making furnace lining.
The present invention is described further below in conjunction with embodiment, but the present invention is not limited only to these examples
Get material in table 1 ratio, mixed grind to granularity is 15～40mm, adds the water allotment and is pressed into pelletizing.
Each component concentration table of table 1 dissolving agent of the present invention (following is the weight meter)
| Sequence number | Fluorite % | ??FeO％ | Steel-smelting sewage sludge % | Additive % |
| ???1. | ???20 | ???34 | ?????40 | ????6 |
| ???2. | ????0 | ???50 | ?????35 | ????12 |
| ???3. | ???20 | ???50 | ?????20 | ????8 |
| ???4. | ????8 | ???40 | ?????40 | ????12 |
Additive of the present invention is made up of toughener, wedding agent, water reducer, magnesium powder.
According to the requirement of process for making, add or do not add fluorite, the add-on of fluorite is according to the processing requirement adjustment.
This dissolving agent has been smelted Q235-B, A, A32,16MR, 16MR steel grades such as (CR), and its smelting operation is normal, big production that can the applicable variety steel.
Fluorite and this dissolving agentization slag effect compare:
As seen from the above table:
| Kind | Average add-on (Kg) | One fall T (℃) | One falls C (%) | One falls P (%) | One falls S (%) | One falls FeO (%) |
| Fluorite | ????479 | ?1621 | ???0.24 | ??0.032 | ??0.029 | ?16.54 |
| Dissolving agent | ????580 | ?1628 | ???0.40 | ??0.042 | ??0.030 | ?15.24 |
| Relatively (±) | ???+101 | ??-3 | ??-0.16 | ??0.010 | ??0.001 | ?+1.00 |
1. from the content of falling P as can be seen, this dissolving agent effect is good than fluorite;
2. FeO contains and takes temperature from a deslagging, and this dissolving agent is effective than fluorite.
By to a comparative analysis of falling C, P and change slag situation, this dissolving agent effect is better, and basic effect with fluorite is suitable, fully can be with this dissolving agent replacement fluorite slag; After using this dissolving agent, content of fluoride reduces greatly in the molten steel, can reduce steel-making furnace lining etch, prolongs the work-ing life of furnace lining, and the content of fluoride in the recirculated water of dust-removal system reduces greatly, can reach environmental requirement, reduces environmental pollution.
Claims (2)
1. composite slag melting agent for steelmaking is characterized in that the consisting of of dissolving agent (below be weight percentage): fluorite 0～20%; FeO25～50%; Steel-smelting sewage sludge 20～40%; Additive 6～12%; The weight percent sum of above-mentioned substance and additive and impurity is absolutely.
2. composite slag melting agent for steelmaking according to claim 1 is characterized in that additive is made up of toughener, wedding agent, water reducer, magnesium powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00109905 CN1333381A (en) | 2000-07-06 | 2000-07-06 | Composite slag melting agent for steelmaking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00109905 CN1333381A (en) | 2000-07-06 | 2000-07-06 | Composite slag melting agent for steelmaking |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1333381A true CN1333381A (en) | 2002-01-30 |
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ID=4579947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00109905 Pending CN1333381A (en) | 2000-07-06 | 2000-07-06 | Composite slag melting agent for steelmaking |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1333381A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102146500A (en) * | 2010-02-08 | 2011-08-10 | 鞍钢股份有限公司 | Fluxing agent for smelting steel as well as preparation and use methods thereof |
| CN107312909A (en) * | 2016-04-26 | 2017-11-03 | 武汉科技大学 | A kind of desulfurization slag former |
| CN108018417A (en) * | 2017-12-11 | 2018-05-11 | 攀枝花钢城集团有限公司 | Steelmaking converter slagging agent and preparation method thereof |
-
2000
- 2000-07-06 CN CN 00109905 patent/CN1333381A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102146500A (en) * | 2010-02-08 | 2011-08-10 | 鞍钢股份有限公司 | Fluxing agent for smelting steel as well as preparation and use methods thereof |
| CN107312909A (en) * | 2016-04-26 | 2017-11-03 | 武汉科技大学 | A kind of desulfurization slag former |
| CN108018417A (en) * | 2017-12-11 | 2018-05-11 | 攀枝花钢城集团有限公司 | Steelmaking converter slagging agent and preparation method thereof |
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