CN102876840A - Steelmaking siliceous premelting composite deoxidation and desulfurization agent and preparation method thereof - Google Patents
Steelmaking siliceous premelting composite deoxidation and desulfurization agent and preparation method thereof Download PDFInfo
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- CN102876840A CN102876840A CN2012102262688A CN201210226268A CN102876840A CN 102876840 A CN102876840 A CN 102876840A CN 2012102262688 A CN2012102262688 A CN 2012102262688A CN 201210226268 A CN201210226268 A CN 201210226268A CN 102876840 A CN102876840 A CN 102876840A
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Abstract
The invention relates to a low-cost steelmaking siliceous premelting composite deoxidation and desulfurization agent and a preparation method thereof. The composite deoxidation and desulfurization agent mainly adopts industrial wastes rich in calcium oxide and silicon as raw materials. The preparation method comprises the following steps: making the industrial wastes into powders; mixing the powders according to a given proportion; placing the mixture in a high-temperature kiln for heating, wherein the heating is electric heating with a DC (direct-current) or AC (alternating current) arc, and the melting temperature is 1,450 to 1,650 DEG C; crystallizing and cooling the mixture after melting and discharging the mixture; and breaking the mixture to prepare the lumpy low-melting-point premelting composite deoxidation and desulfurization agent which is rich in Si and CaO and has the granularity of 0 to 70 mm. The composite deoxidation and desulfurization agent is low in melting point and high in melting speed and sulfur capacity, and is added during the process of tapping or refining molten steel in an LF furnace to carry out composite deoxidation and desulfurization on the molten steel; since the composite deoxidation and desulfurization agent is formed through high-temperature melting, is stable in performance, is not liable to deterioration, water absorption and pulverization, is low-fluorine, and is not only convenient to store and transport but also beneficial to environmental protection and reduction of pollution; and since the composite deoxidation and desulfurization agent is prepared from the industrial wastes, the cost is low, and the deoxidation and desulfurization effects are superior to those of other types of desulfurizers.
Description
Technical field
The invention belongs to the STEELMAKING PRODUCTION technical field, particularly a kind of low-cost steel-making siliceous complex deoxidization sweetening agent of pre-molten and preparation method thereof.
Background technology
At present, the method for behind stove molten steel being carried out deoxidation has multiple, mainly contains: the aluminium deoxidation method generally is that the molten steel in the ladle adds metallic aluminium when tapping, and this deoxidation method method is fairly simple, but deoxidation effect is unstable; Silicon deoxidation method generally is to add material in tapping forward direction ladle, and this method of deoxidation is also fairly simple, and deoxidation effect is also unstable, and can make molten steel increase silicon; Also have the methods such as silicocalcium deoxidation method, heart yearn deoxidation method, these method deoxidation effects are better, but cost is higher.
At present, the method of behind stove molten steel being carried out desulfurization mainly contains: lime+fluorite method, both in ladle, added lime simultaneously with addition of the part fluorite, and this refining desulfuration method is fairly simple, but fluorite can be to environment, and affects the work-ing life of refractory materials; Lime+aluminium vanadine method has both added lime simultaneously with addition of part aluminium vanadine in ladle, this refining desulfuration method is also fairly simple, and without the pollution of fluorite, very little to the etch of anti-material, but lime is difficult for fusing, bad desulfurization effects; Also having a kind of method is lime+calcium aluminate method, both in ladle, added lime simultaneously with addition of partially sintering type or preliminary melting type calcium aluminate, adopt this method lime fusing fast, sweetening effectiveness is good, and environmental, but the sintered type calcium aluminate easily absorbs airborne moisture and the efflorescence of making moist, and the production energy consumption of preliminary melting type calcium aluminate is more, cost is higher.If use CaO-CaF
2Not only the impact on refractory corrosion is larger for the base pre-melted slag, and pollutes the environment.
Chinese patent 98101510.7 discloses a kind of aluminium-contained premelting slag and preparation method thereof and has contained molten steel desulfurizer and the scavenging agent of this slag, aluminium-contained premelting slag in this patent not with the lime fritting interior, because the fusing point of lime is higher, merely pre-melted slag and the lime of this patent are used with, fusing time is longer in refining process, be unfavorable for rapid slagging and desulfurization, and contain in the pre-melted slag the larger fluorite of anti-material erosion, if mix use with lime etc., be difficult for preserving, the very easy moisture absorption can make molten steel increase hydrogen, affects the quality of steel.
Chinese patent CN97121984.2 discloses a kind of prescription and manufacture method thereof of low silicon content aluminium-calcium slag, although this aluminium calcium slag has rational chemical constitution, low melting point, without advantages such as free calcium oxide, good fluidities, but because S, Si content are higher in the raw materials used burnt silicon, cause its Sulfur capacity coefficient to reduce, limit the performance of its desulfidation, be unfavorable for the dark desulfurization of molten steel.
Chinese patent CN02120744.5 discloses a kind of pre-molten low-melting point composite calcium aluminate desulfurizer and preparation method thereof, in the production of this composite desulfurizing agent, and melting after the first passivation of palpus, operation is loaded down with trivial details, and cost is higher.
Chinese patent CN200710023020.0 discloses a kind of preliminary melting type vacuum smelting sweetening agent and preparation method thereof, this sweetening agent adopts the method for first fritting, rear mix, inhomogeneous, the unsettled situation of effect that component is prone to, and operation is more loaded down with trivial details, and cost is higher.
Chinese patent CN200310103105. discloses a kind of pre-molten refining scavenging agent and production technique thereof, this premelt molten steel cleaning agent, although reached certain sweetening effectiveness, but the erosion of the refractory materials that high fluorite content brings, not only had a strong impact on the work-ing life of furnace lining or ladle lining, and unfavorable environmental protection, application is limited by very large.
Summary of the invention
The objective of the invention is to overcome the defective of above-mentioned deoxidation, sulfur method existence, a kind of environment protection, low cost steel-making pre-molten complex deoxidization sweetening agent and preparation method thereof of being produced as main raw material with trade waste is provided.
In order to reach the foregoing invention purpose, technical scheme of the present invention is as follows, and the preparation method of this pre-molten complex deoxidization sweetening agent may further comprise the steps:
The first step: prepare raw material, raw material comprises the material that is rich in calcium oxide and the material that is rich in silicon;
Second step: the raw material of preparing in the first step is made respectively powder;
The 3rd step: mix, the powder for preparing in the second step is mixed by a certain percentage;
The 4th step: melting adds the powder that mixes in the high temperature kiln type of heating: electrically heated, and direct current or alternating current arc carry out melting 1450～1650 ℃ of temperature;
The 5th step: come out of the stove post crystallization cooling of melting;
The 6th step: broken moulding, through fragmentation, make and be rich in CaO and Si, granularity are the block low melting point pre-molten complex deoxidization sweetening agent of 0～70mm.
Wherein, the various trade wastes such as carbide slag, calcium lime powder, paper white sludge, calcium powder that comprise the raw mineral materialss such as calcite, Wingdale, rhombspar and be rich in calcium oxide of the material that is rich in calcium oxide in the raw material.The waste silicon powder that produces in the raw mineral materials such as the material silicon lime stone that is rich in silicon in the raw material, silicon breeze and the Industrial processes, useless silica brick etc. are rich in the trade waste of silicon.Trade waste is chief component in the above-mentioned raw materials, and raw mineral materials is less important integral part.And the weight percentage ranges of above-mentioned two class materials is respectively: the material that is rich in silicon is 30%～60%; The material that is rich in calcium oxide is 40%～70%.
At last, the low cost steel-making for preparing with the composition range of pre-molten complex deoxidization sweetening agent is: (Si herein is except SiO to Si
2Si composition mutually, SiO
2Calculate separately mutually) 35～55%, CaO30～50%, SiO
2≤ 8%, F
-≤ 2%, other content of impurities≤5%.
During use, in the steel-making tapping process, add complex deoxidization sweetening agent of the present invention, perhaps at LF (Ladle Furnace ladle refining furnace) stove molten steel is carried out adding complex deoxidization sweetening agent of the present invention in the refining process, reach the purpose of molten steel being carried out the complex deoxidization desulfurization.
The invention has the beneficial effects as follows: because the raw material of pre-melted refining slag has extensively adopted carbide slag, calcium lime powder, paper white sludge, calcium powder etc. to be rich in the various trade wastes of calcium oxide among the present invention, and the waste silicon powder that produces in the Industrial processes, useless silica brick etc. are rich in the trade waste of silicon, therefore have the low characteristics of production cost.
Simultaneously, pre-molten complex deoxidization sweetening agent of the present invention, low, the molten speed of fusing point is fast, sulfur capacity is high, and deoxidization desulfuration is effective; Simultaneously since pre-melted refining slag high-temperature fusion of the present invention form, stable performance, never degenerate, do not absorb water, not efflorescence, low fluorine, not only be convenient to store and transportation, also favourable environmental protection reduces pollution.Thereby under the prior art condition, improve the deoxidation of molten steel sweetening effectiveness, improve the quality of products, reduce production costs, optimize work situation, boost productivity.
Embodiment
Below, describe the preferred embodiments of the present invention in detail.Need to prove before this, employed term or word can not limited interpretation be the implication in common implication or the dictionary in this specification and claims book, and should be based in order to illustrate that in the best way principle that its invention contriver can suitably define the concept of term is interpreted as meeting implication and the concept of the technology of the present invention thought.Thereupon, the structure that represents among the embodiment that this specification sheets is put down in writing is one of most preferred embodiment of the present invention, can not represent technological thought of the present invention fully, therefore should be understood that to have for the present invention various equivalents and the variation that can replace.
Total preparation:
Raw material: adopt the material be rich in calcium oxide, the various trade wastes such as carbide slag, calcium lime powder, paper white sludge, calcium powder that comprise the raw mineral materials such as calcite, Wingdale, rhombspar and be rich in calcium oxide, 40～70% (weight); And the material that is rich in silicon comprises that the waste silicon powder that produces in the raw mineral materials such as wollastonite, silicon breeze and the Industrial processes, useless silica brick etc. are rich in the trade waste of silicon, 30～60% (weight).Trade waste is chief component in the above-mentioned raw materials, and raw mineral materials is less important integral part.
Preparation: the trade waste that will be rich in first calcium oxide is made powder with the trade waste that is rich in silicon, mix by a certain percentage again, then add in the high temperature kiln, type of heating: alternating current arc electrically heated, 1450～1650 ℃ of smelting temperatures, after melting is come out of the stove, the crystallization cooling, through fragmentation, make and be rich in Si and CaO, granularity are the carbonaceous pre-molten complex deoxidization sweetening agent of 0～70mm.
In the actual production, because the calcic raw material is different from the silicon-containing material weight ratio, should select different smelting temperatures, this is because the fusing point of silicon class raw material is low than the fusing point of calcium oxide raw material, it then is just can know by great many of experiments that but the optimum temps of different ratios of raw materials is selected, can not just can obtain by simple computation or imagination, this is inventive point of the present invention place just also.
Below provide the several exemplary embodiments under the different working conditions, because the obtained raw material during actual production varies, particularly should do suitable adjustment for the concrete technology parameter in the production stage in certain situation that the class raw material is many, other raw materials are few, this also illustrates, and suitability of the present invention is extensive, cost is low, easy to control.
Embodiment one:
Raw material: be rich in calcium oxide trade waste 40%, be rich in the trade waste 60% (weight) of silicon.
Preparation: the trade waste that will be rich in first calcium oxide is made powder with the trade waste that is rich in silicon, mix by a certain percentage again, then add in the high temperature kiln, type of heating: alternating current arc electrically heated, 1450 ℃ of smelting temperatures, after melting is come out of the stove, the crystallization cooling, through fragmentation, make and be rich in Si and CaO, granularity are the carbonaceous pre-molten complex deoxidization sweetening agent of 0～70mm.
Use: in tapping process, add the pre-molten complex deoxidization sweetening agent of 1.5kg/ ton steel in the ladle, after the refining, oxygen content in steel 13ppm, the desulfurization degree of molten steel reaches 80%.
Embodiment two:
Raw material: be rich in calcium oxide trade waste 70% (weight), be rich in the trade waste 30% (weight) of silicon.
Preparation: the trade waste that will be rich in first calcium oxide is made powder with the trade waste that is rich in silicon, mix by a certain percentage again, then add in the high temperature kiln, type of heating: alternating current arc electrically heated, 1650 ℃ of smelting temperatures, after melting is come out of the stove, the crystallization cooling, through fragmentation, make and be rich in Si and CaO, granularity are the carbonaceous pre-molten complex deoxidization sweetening agent of 0～70mm.
Use: in tapping process, add the pre-molten complex deoxidization sweetening agent of 1.5kg/ ton steel in the ladle, after the refining, oxygen content in steel 15ppm, the desulfurization degree of molten steel reaches 75%.
Embodiment three:
Raw material: be rich in calcium oxide trade waste 50% (weight), be rich in the trade waste 50% (weight) of silicon.
Preparation: the trade waste that will be rich in first calcium oxide is made powder with the trade waste that is rich in silicon, mix by a certain percentage again, then add in the high temperature kiln, type of heating: alternating current arc electrically heated, 1550 ℃ of smelting temperatures, after melting is come out of the stove, the crystallization cooling, through fragmentation, make and be rich in Si and CaO, granularity are the carbonaceous pre-molten complex deoxidization sweetening agent of 0～70mm.
Use: at the LF stove molten steel is carried out in the refining process, add the pre-molten complex deoxidization sweetening agent of 2.0kg/ ton steel, after the refining, oxygen content in steel 13ppm, the desulfurization degree of molten steel reaches 85%.
Be described and illustrate with reference to embodiment although it should be noted that the present invention, and in embodiment, provided low-cost steel-making with the composition of siliceous pre-molten complex deoxidization sweetening agent and concrete preparation method thereof.But and do not mean that the present invention is limited to the embodiment of these descriptions.Those skilled in the art can therefrom derive many different variants, and they all will be covered in the true spirit and scope of claim of the present invention.
Claims (8)
1. a low-cost steel-making is characterized in that: the composition range of described pre-molten complex deoxidization sweetening agent: Si 35～55%, CaO 30～50%, SiO with siliceous pre-molten complex deoxidization sweetening agent
2≤ 8%, F
-≤ 2%, other content of impurities≤5%.
2. a low-cost steel-making is with the preparation method of siliceous pre-molten complex deoxidization sweetening agent, and it is characterized in that: the preparation method may further comprise the steps:
The first step: prepare raw material, raw material comprises the material that is rich in calcium oxide and the material that is rich in silicon;
Second step: the raw material of preparing in the first step is made respectively powder;
The 3rd step: mix, the powder for preparing in the second step is mixed by a certain percentage;
The 4th step: melting adds the powder that mixes in the high temperature kiln type of heating: electrically heated, and direct current or alternating current arc carry out melting 1450～1650 ℃ of temperature;
The 5th step: come out of the stove post crystallization cooling of melting;
The 6th step: broken moulding, through fragmentation, make and be rich in CaO and Si, granularity are the block low melting point pre-molten complex deoxidization sweetening agent of 0～70mm.
3. a kind of low-cost steel-making according to claim 2 is with the preparation method of siliceous pre-molten complex deoxidization sweetening agent, it is characterized in that: the material that the raw material in the first step is rich in calcium oxide comprises the raw mineral materialss such as calcite, Wingdale, rhombspar and is rich in the various trade wastes such as the carbide slag of calcium oxide, calcium lime powder, paper white sludge, calcium powder, and wherein trade waste is chief component.
4. a kind of low-cost steel-making according to claim 2 is with the preparation method of siliceous pre-molten complex deoxidization sweetening agent, it is characterized in that: the material that the raw material in the first step is rich in silicon comprises that the waste silicon powder that produces in the raw mineral materials such as wollastonite, silicon breeze and the Industrial processes, useless silica brick etc. are rich in the trade waste of silicon, and wherein trade waste is chief component.
According to claim 3 or 4 described a kind of low-cost steel-making with the preparation method of siliceous pre-molten complex deoxidization sweetening agent, it is characterized in that: the weight percentage ranges that the raw material in the first step is rich in the material of silicon is 30%～60%; The weight percentage ranges that is rich in the material of calcium oxide is 40%～70%.
6. a kind of low-cost steel-making according to claim 5 is with the preparation method of siliceous pre-molten complex deoxidization sweetening agent, it is characterized in that: in the raw material that adopts, be rich in the weight percent of material of calcium oxide about 40%, be rich in the weight percent of material of silicon when 60% left and right sides, smelting temperature is controlled at 1450 ℃～1470 ℃, preferred 1450 ℃.
7. a kind of low-cost steel-making according to claim 5 is with the preparation method of siliceous pre-molten complex deoxidization sweetening agent, it is characterized in that: in the raw material that adopts, be rich in the weight percent of material of calcium oxide about 70%, be rich in the weight percent of material of silicon when 30% left and right sides, smelting temperature is controlled at 1630 ℃～1650 ℃, preferred 1650 ℃.
8. a kind of low-cost steel-making according to claim 5 is with the preparation method of siliceous pre-molten complex deoxidization sweetening agent, it is characterized in that: the material that is rich in calcium oxide in the raw material that adopts is close with the weight percent of the material that is rich in silicon, be that the two is all when 50% left and right sides, smelting temperature is controlled at 1530 ℃～1570 ℃, preferred 1550 ℃.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108570533A (en) * | 2018-05-17 | 2018-09-25 | 山东钢铁股份有限公司 | A kind of deoxidation slag charge suitable for Si killed steel |
| CN112374875A (en) * | 2020-11-12 | 2021-02-19 | 郑州东豫新材料科技有限公司 | Silica brick based on tunnel kiln desulfurization solid waste reclaimed material as mineralizer and preparation method thereof |
| CN114875194A (en) * | 2022-04-25 | 2022-08-09 | 武汉钢铁有限公司 | Molten iron lime-based KR high-efficiency desulfurizing agent and preparation method thereof |
| CN115057648A (en) * | 2022-06-24 | 2022-09-16 | 浙大宁波理工学院 | Foaming agent for aerated concrete and aerated concrete |
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| CN101463413A (en) * | 2009-01-14 | 2009-06-24 | 沈阳万水工贸有限公司 | Composite type ladle top slag modifier and production method thereof |
| CN102296153A (en) * | 2011-08-22 | 2011-12-28 | 辽宁天和科技股份有限公司 | Novel premelting dephosphorization agent for steel making and preparation method thereof |
| CN102296152A (en) * | 2011-08-22 | 2011-12-28 | 辽宁天和科技股份有限公司 | Novel converter steelmaking dephosphorization agent and preparation method thereof |
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| JP2002060832A (en) * | 2000-08-08 | 2002-02-28 | Nippon Magnetic Dressing Co Ltd | Calcium aluminate-based desulfurizing agent |
| CN101463413A (en) * | 2009-01-14 | 2009-06-24 | 沈阳万水工贸有限公司 | Composite type ladle top slag modifier and production method thereof |
| CN102296153A (en) * | 2011-08-22 | 2011-12-28 | 辽宁天和科技股份有限公司 | Novel premelting dephosphorization agent for steel making and preparation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108570533A (en) * | 2018-05-17 | 2018-09-25 | 山东钢铁股份有限公司 | A kind of deoxidation slag charge suitable for Si killed steel |
| CN108570533B (en) * | 2018-05-17 | 2019-11-15 | 山东钢铁股份有限公司 | A kind of deoxidation slag charge suitable for Si killed steel |
| CN112374875A (en) * | 2020-11-12 | 2021-02-19 | 郑州东豫新材料科技有限公司 | Silica brick based on tunnel kiln desulfurization solid waste reclaimed material as mineralizer and preparation method thereof |
| CN114875194A (en) * | 2022-04-25 | 2022-08-09 | 武汉钢铁有限公司 | Molten iron lime-based KR high-efficiency desulfurizing agent and preparation method thereof |
| CN114875194B (en) * | 2022-04-25 | 2023-11-14 | 武汉钢铁有限公司 | Molten iron lime-based KR efficient desulfurizing agent and preparation method thereof |
| CN115057648A (en) * | 2022-06-24 | 2022-09-16 | 浙大宁波理工学院 | Foaming agent for aerated concrete and aerated concrete |
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Application publication date: 20130116 |