CN103320575A - Molten-steel desulphurization dephosphorization treatment agent and preparation method - Google Patents
Molten-steel desulphurization dephosphorization treatment agent and preparation method Download PDFInfo
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- CN103320575A CN103320575A CN201310087587XA CN201310087587A CN103320575A CN 103320575 A CN103320575 A CN 103320575A CN 201310087587X A CN201310087587X A CN 201310087587XA CN 201310087587 A CN201310087587 A CN 201310087587A CN 103320575 A CN103320575 A CN 103320575A
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- molten steel
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Abstract
A molten-steel desulphurization dephosphorization treatment agent is characterized in that: the weight percent of the chemical components are: 15-25% of iron oxides FeO+Fe2O3, 10-20% of lithium metal or a lithium compound, 5-10% of CaF2, 8-15% of Al2O3, 0.5-2% of mischmetal, the balance CaO; and wherein the lithium metal or the lithium compound is any one main material of Li, Li2O, LiOH and Li2CO3. A preparation method for the molten-steel desulphurization dephosphorization treatment agent comprises: ball milling and mixing the raw materials, pre-burning the mixture at a temperature of 1100 DEG C-1200 DEG C, smashing the pre-burned raw material mixture to a granularity of 1-2 mm, then stirring and blending uniformly, and getting the agent. The molten-steel desulphurization dephosphorization treatment agent has the advantages of low cost, no added equipment investment, simple operation, easy realization and substantial economic benefit and social benefit.
Description
Technical field
The present invention relates to the smelting molten steel field, particularly the agent of a kind of molten steel desulfurizing dephosphorization treatment and preparation method.
Background technology
For most of steel grades, sulphur is the element that is harmful to.Sulphur content is high in the steel, and the processing characteristics of steel and use properties are reduced greatly, in hot procedure in addition can cause " hot-short " fracture.Its formed sulfide in steel reduces the toughness of steel, and manganese sulfide inclusion is the source region of steel matrix pitting attack, and the hydrogen embrittlement of steel and steel medium sulphide content are mingled with also substantial connection.Phosphorus also is its deleterious effect to most of steel grades, and it reduces impelling strength, the especially low-temperature impact toughness of steel, and manor diameter segregation makes sheet material produce banded structure, causes the anisotropy of sheet material.The sulphur, the phosphorus content that reduce in the steel are of great significance raising product made from steel quality, tool.
Therefore, the molten steel desulfurizing dephosphorization is an important procedure on the STEELMAKING PRODUCTION.It is the key that guarantees steel quality.Patent 200910264035. provides a kind of dephosphorization, sulfur method that adopts in the induction furnace steel-smelting process that utilize, furnace charge melting period and fully the fusing after the initial stage, liquid steel temperature is controlled at is lower than 1450 ℃, the dephosphorizing agent that adopts lime-ferric oxide-boric anhydride to form, molten steel is carried out dephosphorization treatment, phosphorus content in the molten steel can be controlled to below 0.01%; After the dephosphorization task is finished, thoroughly slagging-off, molten steel 1500 ℃ of-1600 ℃ of scopes that are rapidly heated, after molten steel pre-deoxidation and alloying, add the sweetening agent that lime-calcium carbide-the aluminium ash forms, molten steel is carried out desulfurization process, sulphur content in the molten steel can be reduced to below 0.008%.Patent 200610134670.8 documents provide a kind of method of being made dephosphorizing agent by natrium material.Through heating, make its dissolving by materials such as yellow soda ash, sodium sulfate, sodium-chlor, make through the mist projection granulating cooling again.Patent 200810035042.3 documents comprise the steps: 1 by following) the RH dephosphorization, according to free oxygen level and converter operation ladle phosphorus, sulphur content in the initial steel of RH processing beginning, RH keeps vacuum tightness 5-6KPA, adds the dephosphorization pulvis, and the molten steel phosphorus content is 0.005%-0.010%; 2) after dephosphorization finished, vacuum tightness≤72PA entered the decarburization stage; Gas flow is controlled at 1200-1600NL/MIN, temperature 1585-1595 ℃; 3) decarburization finishes, and aluminum deoxidation after the deoxidation, adds sweetening agent, and add-on is 4-8KG/T,
Molten steel desulfurizing; 4) alloying configuration reaches the requirement of the steel grade ultimate constituent; 5) RH vacuum breaker, steel ladle bottom argon blowing stirs, and feeds cored-wire, and deep deoxidation and inclusion modification are processed; 6) after line feeding finished, steel ladle bottom argon blowing stirred, and inclusion is fully floated; 7) stir end, add aluminium powder above the ladle top slag, the top slag carries out abundant deoxidation, further reduces the molten steel total oxygen content.Patent 200910248969.X document provides a kind of pre-melted desulfurizing agent for refining molten steel, is comprised of following several compositions in weight percentage: calcium oxide 55-70%; Alumine 10-25%; Aluminium ash 10-25%.Described aluminium ash is the slag in the aluminium production processed.Its preparation method is said components to be ground make the 0-2mm powder, is mixed in proportion, and through 1450-1600 ℃ of high melt, comes out of the stove after the cooling, is broken into the 0-70mm particle and gets final product.Its impurity SiO
2≤ 8%, Fe
2O
3≤ 1.5%, MgO≤1.2%, CaF
2≤ 3%, moisture≤0.5%.Its effect is: (1) fusing point is low, and molten speed is fast; (2) desulfurization degree can reach more than 60%; (3) doctor solution consumption reduces about 50%; (4) can be used for molten steel, desulfurizing iron; (5) floride-free or little fluorine; Environmental.Patent 02139690.6 document discloses a kind of New Desulphurizers and manufacturing process thereof that can be used for molten iron or molten steel desulfurizing, this sweetening agent is mainly by sulphophile agent, reductor, heat-generating agent, soda acid and fusing point conditioning agent, reaction promotor, reaction product stablizer and binding agent form, come into operation after mixing rear mechanical-moulded drying by its weight percent, tap a blast furnace or tapping process in, can directly this sweetening agent be joined in iron bag or the ladle, do not need other equipment, easy and simple to handle, and also has certain deoxidation effect, in sweetening process, do not lower the temperature, desulfurization product is stable, do not produce back the sulphur phenomenon, desulfurization degree is stable, can apply in metallurgy and machinery industry.Patent 03112433.X document discloses a kind of iron and steel composite desulfurizing agent, by the calcium oxide of 20-75%, and the Calcium Fluoride (Fluorspan) of 5-20%, the carbide of calcium of 10-60% and the barium carbonate of 3-10% form.Wherein calcium oxide and carbide of calcium are through Passivation Treatment.Than carbide of calcium sweetening agent manufacturing cost decline 20-60%; Owing to having introduced barium carbonate, improve the stability of desulfurization slag medium sulphide content simultaneously, effectively prevented time sulphur phenomenon; Desulphurization reaction speed obviously improves, and sweetening effectiveness is good.The desulfurizing and refining that can be widely used in smelting industry molten steel and molten iron.
Above-mentioned document be that the molten steel desulfurizing dephosphorizing agent exists or production cost is high, or desulfurization dephosphorization efficient is low, can not realize economical and efficiently desulfurization dephosphorization.Advantage of the present invention is the characteristics in conjunction with molten steel, realizes high efficiency dephosphorating, desulfurization by slag making, has increased substantially the quality of molten steel.Simultaneously, adopt molten steel treating agent desulfurization dephosphorization cost of the present invention low, need not increase facility investment, simple to operate, be easy to realize to have significant economic benefit and social benefit.The inventive method is simple, the desulfurization dephosphorization agent effect of making is very good, desulfurization dephosphorization efficient is high, according to the existing working condition of contriver place company, the contriver provides the desulfurization dephosphorization agent of a kind of steel treatment of desulfurization dephosphorization successful, commercial test results shows that desulfurization dephosphorization can be reduced to below the 18ppm, and minimum is 10ppm, has effectively solved existing method and has made the practical problems that the desulfurization dephosphorization agent exists.
Summary of the invention
The purpose of this invention is to provide a kind of steel treatment desulfurization dephosphorization agent and preparation method for the liquid steel refining operation.
The invention provides the agent of a kind of molten steel desulfurizing dephosphorization treatment, it is characterized in that: chemical component weight per-cent is: ferric oxide FeO+Fe
2O
3: 15-25%; Metallic lithium or its compound 10-20%; CaF
2: 5%-10%; Al
2O
3: 8%-15%; Mishmetal: 0.5-2%, clout are CaO.
Described metallic lithium or its compound are Li, Li
2O, LiOH, Li
2CO
3In any one major ingredient.
The size range of described sweetening agent is 1-2mm.
A kind of preparation method who prepares molten steel desulfurizing dephosphorization treatment claimed in claim 1 agent is characterized in that: described raw material ball milling is mixed and the pre-burning mixture, and calcined temperature is 1100 ℃-1200 ℃; It is 1-2mm that raw mix after the pre-burning is crushed to size range.
Dark desulfurization sweetening agent adds deep desulfurizer as best take tapping the time, and when sweetening agent adds first bag during the end, ladle itself has the high temperature more than 1000 ℃, CaCO
3, Li
2CO
3Deng decomposing first, reduced function, all emit molten steel after, therefore the undermixing of molten steel and sweetening agent also affects function, adds the deep desulfurizer effect best when putting into molten steel.
Under identical condition, the add-on of dark desulfurization dephosphorization agent is take the 2-3kg/t steel as best, and consumption is minimum and effect is best.When condition changed, consumption was adjusted slightly to some extent, and each desulfurization amount is below 18ppm, and minimum is 10ppm.
Advantage of the present invention:
Molten steel desulfurizing dephosphorization treatment of the present invention agent and preparation method for the molten steel desulfurizing dephosphorization of liquid steel refining operation, in conjunction with the characteristics of molten steel, realize high efficiency dephosphorating, desulfurization by slag making, have increased substantially the quality of molten steel.Adopt molten steel treating agent desulfurization dephosphorization cost of the present invention low, need not increase facility investment, simple to operate, be easy to realize to have significant economic benefit and social benefit.Method is simple, and the desulfurization dephosphorization agent effect of making is very good, and desulfurization dephosphorization efficient is high, and desulfurization dephosphorization can be reduced to below the 18ppm, and minimum is 10ppm, has effectively solved existing method and has made the practical problems that the desulfurization dephosphorization agent exists.
Embodiment
Embodiment 1
The present embodiment provides the agent of a kind of molten steel desulfurizing dephosphorization treatment, it is characterized in that: chemical component weight per-cent is: ferric oxide FeO+Fe
2O
3: 15%; Metallic lithium 10%; CaF
2: 5%%; Al
2O
3: 8%%; Mishmetal: 0.5%, clout is CaO.
The size range of described sweetening agent is 1-2mm.
A kind of preparation method who prepares molten steel desulfurizing dephosphorization treatment claimed in claim 1 agent is characterized in that: described raw material ball milling is mixed and the pre-burning mixture, and calcined temperature is 1100 ℃-1200 ℃; It is 1-2mm that raw mix after the pre-burning is crushed to size range.
Embodiment 2
The present embodiment provides the agent of a kind of molten steel desulfurizing dephosphorization treatment, it is characterized in that: chemical component weight per-cent is: ferric oxide FeO+Fe
2O
3: 20%; Li
2O15%; CaF
2: 5%-10%; Al
2O
3: 8%-15%; Mishmetal: 0.5-2%, clout are CaO.
A kind of preparation method who prepares molten steel desulfurizing dephosphorization treatment claimed in claim 1 agent is characterized in that: described raw material ball milling is mixed and the pre-burning mixture, and calcined temperature is 1100 ℃-1200 ℃; It is 1-2mm that raw mix after the pre-burning is crushed to size range.
Embodiment 3
The present embodiment provides the agent of a kind of molten steel desulfurizing dephosphorization treatment, it is characterized in that: chemical component weight per-cent is: ferric oxide FeO+Fe
2O
3: 25%; Li
2CO
320%; CaF
2: 5%-10%; Al
2O
3: 8%-15%; Mishmetal: 0.5-2%, clout are CaO.
A kind of preparation method who prepares molten steel desulfurizing dephosphorization treatment claimed in claim 1 agent is characterized in that: described raw material ball milling is mixed and the pre-burning mixture, and calcined temperature is 1100 ℃-1200 ℃; It is 1-2mm that raw mix after the pre-burning is crushed to size range.
Claims (4)
1. molten steel desulfurizing dephosphorization treatment agent is characterized in that: chemical component weight per-cent is: ferric oxide FeO+Fe
2O
3: 15-25%; Metallic lithium or compound 10-20%; CaF
2: 5%-10%; Al
2O
3: 8%-15%; Mishmetal: 0.5-2%, clout are CaO.
2. according to molten steel desulfurizing dephosphorization treatment claimed in claim 1 agent, it is characterized in that: described metallic lithium or compound are Li, Li
2O, LiOH, Li
2CO
3In any one major ingredient.
3. according to claim 1 or 2 described molten steel desulfurizing dephosphorization treatment agent, it is characterized in that: the size range of described sweetening agent is 1-2mm.
4. preparation method who prepares molten steel desulfurizing dephosphorization treatment claimed in claim 1 agent is characterized in that: described raw material ball milling is mixed and the pre-burning mixture, and calcined temperature is 1100 ℃-1200 ℃; It is 1-2mm that raw mix after the pre-burning is crushed to size range, and restir is mixed evenly to be formed.
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|---|---|---|---|
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| CN201310087587XA CN103320575A (en) | 2013-03-19 | 2013-03-19 | Molten-steel desulphurization dephosphorization treatment agent and preparation method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109852756A (en) * | 2019-03-06 | 2019-06-07 | 安徽工业大学 | A kind of efficient chromium-containing molten iron pretreatment dephosphorizing agent of few fluorine |
| CN109913618A (en) * | 2019-04-30 | 2019-06-21 | 无锡汇蓝新材料科技有限公司 | It is a kind of for electric furnace or the composite core-spun yarn of ladle dephosphorization treatment |
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| JPS60215710A (en) * | 1984-04-11 | 1985-10-29 | Kobe Steel Ltd | Method for adjusting carbon content of molten steel |
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| CN101892352A (en) * | 2010-07-27 | 2010-11-24 | 辽宁天和矿产有限公司 | Arc furnace deep dephosphorization technology and deep dephosphorization agent thereof |
| CN102010933A (en) * | 2010-11-05 | 2011-04-13 | 钢铁研究总院 | Molten iron dephosphorization agent manufactured by using converter dry-method dust-removal ash as raw material |
| CN102352424A (en) * | 2011-11-07 | 2012-02-15 | 西峡县旭日保护材料有限公司 | Production method of desulfurizing agent for deep desulfurization |
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2013
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| JPS60215710A (en) * | 1984-04-11 | 1985-10-29 | Kobe Steel Ltd | Method for adjusting carbon content of molten steel |
| CN101649371A (en) * | 2009-08-26 | 2010-02-17 | 武汉科技大学 | Desulfurating agent for out-of-furnace treatment and preparation method thereof |
| CN101643811A (en) * | 2009-08-28 | 2010-02-10 | 昆明钢铁控股有限公司 | Method for producing low-phosphorous molten iron by high-phosphorous reduced iron |
| CN101880753A (en) * | 2010-06-10 | 2010-11-10 | 衡阳华菱钢管有限公司 | Strong desulphurizer containing BaO and Li2O, production method thereof and method for deeply desulfurizing liquid steel |
| CN101892352A (en) * | 2010-07-27 | 2010-11-24 | 辽宁天和矿产有限公司 | Arc furnace deep dephosphorization technology and deep dephosphorization agent thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109852756A (en) * | 2019-03-06 | 2019-06-07 | 安徽工业大学 | A kind of efficient chromium-containing molten iron pretreatment dephosphorizing agent of few fluorine |
| CN109913618A (en) * | 2019-04-30 | 2019-06-21 | 无锡汇蓝新材料科技有限公司 | It is a kind of for electric furnace or the composite core-spun yarn of ladle dephosphorization treatment |
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Application publication date: 20130925 |