CN103451368B - A kind of method that steel is carried out desulfurization - Google Patents
A kind of method that steel is carried out desulfurization Download PDFInfo
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- CN103451368B CN103451368B CN201210181325.5A CN201210181325A CN103451368B CN 103451368 B CN103451368 B CN 103451368B CN 201210181325 A CN201210181325 A CN 201210181325A CN 103451368 B CN103451368 B CN 103451368B
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Abstract
The present embodiments relate to field of metallurgy, particularly to a kind of method that steel is carried out desulfurization, in order to conveniently realize the sulfur content reduced in steel.The method that steel carries out desulfurization that the embodiment of the present invention provides includes: in converter, molten iron is carried out electric furnace steel making and obtains molten steel；In ladle refining furnace LF, with binary slag system, described molten steel is carried out desulfurization process, then pass through ternary slag system to carrying out the molten steel after desulfurization process with binary slag system and again carry out desulfurization process.The embodiment of the present invention achieves the sulfur content that only just can reduce in steel with existing steelmaking equipment without the equipment separately building molten iron pretreatment, thus simplifying the technique that steel carries out desulfurization, reduces the difficulty of realization.
Description
Technical field
The present invention relates to field of metallurgy, particularly to a kind of method that steel is carried out desulfurization.
Background technology
Along with the fast development of economic construction, market is more and more higher to the prescription of steel.Quality in order to improve steel is accomplished by reducing the content of sulfur in steel, especially when manufacturing deck of boat steel, Z-direction steel, gap-free atom IF steel and pipe line steel, the requirement of sulfur content in steel is higher.
At present, in order to reduce the sulfur content in steel, general iron and steel enterprise all adopted the method for molten iron pretreatment to carry out desulfurization before molten iron adds converter, such as: throw method, blowing process or KR (KambaraReactor) paddling process.It is need to carry out in the equipment of molten iron pretreatment that steel is carried out desulfurization by the method adopting molten iron pretreatment.
In sum, the method that steel is carried out desulfurization adopted at present, owing to needing to build the equipment of molten iron pretreatment so that steel carries out the complex process of desulfurization, it is achieved difficulty is higher.
Summary of the invention
Embodiments provide a kind of method that steel is carried out desulfurization, in order to conveniently realize the sulfur content reduced in steel.
A kind of method that steel is carried out desulfurization that the embodiment of the present invention provides, including:
In converter, molten iron is carried out electric furnace steel making and obtain molten steel；
In ladle refining furnace LF, with binary slag system, described molten steel is carried out desulfurization process, when needing the sulfur content in described molten steel is reduced to below 30PPM, desulfurization process is again carried out to carrying out the molten steel after desulfurization process with binary slag system by ternary slag system, wherein, described binary slag system is the binary slag system of calcia-silica CaO-SiO2.
In being embodied as, the content of CaO range for 55%～65%, SiO2Content range for 15%～25%.
It is preferred that the content of CaO is 62%, SiO2Content be 20%.
It is preferred that ternary slag system is calcia-silica-aluminium oxide CaO-SiO2-Al2O3Ternary slag system.
In being embodied as, the content of CaO range for 50%～60%, SiO2Content range for less than 13%, Al2O3Content range for 25%～35%.
It is preferred that the content of CaO is 55%, SiO2Content be 8%, Al2O3Content be 28%.
It is preferred that after by slag system molten steel being carried out desulfurization process in ladle refining furnace LF, also include:
In vacuum outgas VD stove, molten steel is carried out Calcium treatment.
In enforcement, molten iron is carried out after electric furnace steel making obtains molten steel in converter, also include before by slag system molten steel being carried out desulfurization process in ladle refining furnace LF: molten steel is carried out pre-deoxidation process.
In embodiments of the present invention, molten steel is obtained owing to molten iron being carried out electric furnace steel making in converter；In ladle refining furnace LF, by slag system, molten steel is carried out desulfurization process, achieve the sulfur content that only just can reduce in steel with existing steelmaking equipment without the equipment separately building molten iron pretreatment, thus simplifying the technique that steel is carried out desulfurization, reduce the difficulty of realization.
Accompanying drawing explanation
Fig. 1 is the method flow schematic diagram that steel is carried out desulfurization by the embodiment of the present invention；
Fig. 2 is the detailed process schematic diagram that steel is carried out the method for desulfurization process by the embodiment of the present invention.
Detailed description of the invention
The embodiment of the present invention, carries out electric furnace steel making to molten iron in converter and obtains molten steel；In ladle refining furnace LF, by slag system, molten steel is carried out desulfurization process.Owing to the sulfur content that just can complete to reduce in steel in existing steelmaking equipment is without the equipment separately building molten iron pretreatment, thus simplifying the technique that steel is carried out desulfurization, reduce the difficulty of realization.
Below in conjunction with Figure of description, the embodiment of the present invention is described in further detail.
As it is shown in figure 1, the method that steel is carried out desulfurization by the embodiment of the present invention comprises the following steps:
Step 101, in converter, molten iron is carried out electric furnace steel making and obtain molten steel；
Step 102, in ladle refining furnace LF, with binary slag system, described molten steel is carried out desulfurization process, then pass through ternary slag system to carrying out the molten steel after desulfurization process with binary slag system and again carry out desulfurization process.
It is preferred that can determine according to demand specifically to adopt desulfurization several times:
Such as molten steel can be carried out once desulfurization；After molten steel can also being carried out once desulfurization, then molten steel is carried out secondary desulfuration；After molten steel can also being carried out secondary desulfuration, then molten steel is carried out deep desulfurization, i.e. third time desulfurization.
It is preferred that binary slag system is calcia-silica CaO-SiO2。
In being embodied as, the content of CaO range for 55%～65%, SiO2Content range for 15%～25%.
It is preferred that the content of CaO is 62%, SiO2Content be 20%.
It is preferred that utilize binary slag system CaO-Al2O3High alkalinity characteristic molten steel is carried out desulfurization.
It is preferred that with binary slag system CaO-Al2O3Sulfur content in molten steel is taken off to 39PPM.
In being embodied as, with CaO-SiO2When molten steel is carried out desulfurization process by binary slag system, when the sulfur content in molten steel takes off to 30PPM (ppm)～50PPM, can cause cannot continuing, with binary slag system, molten steel is carried out desulfurization due to saturation effect, so if desired the sulfur content in molten steel being reduced to below 30PPM, in addition it is also necessary to ternary slag system, molten steel is carried out secondary desulfuration.
It is preferred that ternary slag system is calcia-silica-aluminium oxide CaO-SiO2-Al2O3。
In being embodied as, the content of CaO range for 50%～60%, SiO2Content range for less than 13%, Al2O3Content range for 25%～35%.
It is preferred that the content of CaO is 55%, SiO2Content be 8%, Al2O3Content be 28%.
It is preferred that ternary slag system has high sulfur capacity characteristic, sulfur partition ratio is more than 250.
It is preferred that ternary slag system CaO-SiO2-Al2O3Main mine mutually for low melting point (12CaO 7Al that fusing point is 1535 DEG C2O3) and low melting point (the 3CaO Al of 1415 DEG C2O3)。
Preferably, due to when deoxidation products Al2O3 or SiO2 in (12CaO 7Al2O3) and (3CaO Al2O3) with molten steel meets, the fusing point Low melting point eutectic C2S-C12A7-CA at 1335oC will be generated, so (12CaO 7Al2O3) and (3CaO Al2O3) has the ability of very strong absorption deoxidation products SiO2 and Al2O3.
Preferably, owing to the fusing point of (12CaO 7Al2O3) Yu (3CaO Al2O3) is low and ionic radius big, so (12CaO 7Al2O3) and (3CaO Al2O3) also has the ability of very strong absorption sulfide and nitride.
It is preferred that due to (12CaO 7Al2O3) and (3CaO Al2O3) there is very strong absorption deoxidation products SiO2And Al2O3Ability and there is the ability of very strong absorption sulfide and nitride, so ternary slag system CaO-SiO2-Al2O3There is good desulphurizing ability and there is the ability that stronger absorption is mingled with.
It is preferred that with ternary slag system CaO-SiO2-Al2O3Sulfur content in molten steel is taken off to 18PPM～20PPM.
It is preferred that with ternary slag system CaO-SiO2-Al2O3Sulfur content in molten steel is taken off to 18PPM.
It is preferred that sulfur content is reduced to below 20PPM in steel after desulfurization, it is possible to meet the market requirement to steel quality.
In enforcement, when making binary slag system, the basicity of slag of LF stove is different from the basicity of slag of LF stove when making ternary slag system.
Obtain molten steel can carry out with making in ladle refining furnace LF binary slag system and ternary slag system simultaneously it is preferred that molten iron to be carried out electric furnace steel making in converter, it is also possible to do not carrying out in the same time.
It is preferred that owing to the sulfur content that just can complete to reduce in steel in existing steelmaking equipment LF stove is without the equipment separately building molten iron pretreatment, thus simplifying the technique that steel is carried out desulfurization, reduce the difficulty of realization.And owing to need not separately build the equipment of molten iron pretreatment, also a saving the cost of steel-making.
It is preferred that in order to reduce after molten steel can carry out desulfurization process by slag system by sulfur content in molten steel in ladle refining furnace LF further, molten steel is carried out Calcium treatment in vacuum outgas VD stove.
It is preferred that molten steel is carried out Calcium treatment according to the sulfur content in steel, thus molten steel is carried out deep desulfurization.
Specifically, the content of calcium is 1.5～2.0 times of the content of sulfur.
It is preferred that the position of feeding calcium line is selected in the center of two blocks of air bricks.
It is preferred that calcium and molten steel can mix within the shortest time, thus reaching best desulfurized effect.
It is preferred that after molten steel is carried out Calcium treatment, reduce further the sulfur content in molten steel.
It is preferred that the sulfur content in molten steel can take off to 16PPM～17PPM.
It is preferred that sulfur content is reduced to below 20PPM in steel after desulfurization, it is possible to meet the market requirement to steel quality.
It is preferred that in guaranteeing the steel after desulfurization the ratio of calcium and sulfur more than 1.5 while, must also ensure that in steel, calcium is not more than 30ppm, thus ensureing in steel that refractory material will not be produced to corrode thus producing to be mingled with by calcium.
It is preferred that owing to the sulfur content that just can complete to reduce in steel in existing steelmaking equipment VD stove is without the equipment separately building molten iron pretreatment, thus simplifying the technique that steel is carried out desulfurization, reduce the difficulty of realization.And owing to need not separately build the equipment of molten iron pretreatment, also a saving the cost of steel-making.
It is preferred that molten iron is carried out after electric furnace steel making obtains molten steel in converter, also include before by slag system molten steel being carried out desulfurization process in ladle refining furnace LF: molten steel is carried out pre-deoxidation process.
It is preferred that by adding deoxidizer, such as aluminum Al block, molten steel is carried out pre-deoxidation.
As in figure 2 it is shown, the method that steel is carried out desulfurization process by the embodiment of the present invention comprises the following steps:
Step 201, in converter, molten iron is carried out electric furnace steel making and obtain molten steel；
Step 202, when electric furnace steel tapping, molten steel is carried out pre-deoxidation；
Step 203, in LF stove, with binary slag system, molten steel is carried out desulfurization process；
Step 204, in LF stove, again carry out desulfurization process by ternary slag system to carrying out the molten steel after desulfurization process with binary slag system；
Step 205, in vacuum outgas VD stove, molten steel is carried out Calcium treatment.
Preferably, after three desulfurization, sulfur content in molten steel can take off to 16PPM～17PPM, lower than 20PPM, disclosure satisfy that the market requirement to steel quality, and three desulfurization all complete in existing steelmaking equipment, it is not necessary to separately build the equipment of molten iron pretreatment, thus simplifying the technique that steel is carried out desulfurization, reduce the difficulty of realization.And owing to need not separately build the equipment of molten iron pretreatment, also a saving the cost of steel-making.
Although preferred embodiments of the present invention have been described, but those skilled in the art are once know basic creative concept, then these embodiments can be made other change and amendment.So, claims are intended to be construed to include preferred embodiment and fall into all changes and the amendment of the scope of the invention.Obviously, the present invention can be carried out various change and modification without deviating from the spirit and scope of the present invention by those skilled in the art.So, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (7)
1. the method that steel is carried out desulfurization, it is characterised in that the method includes:
In converter, molten iron is carried out electric furnace steel making and obtain molten steel；
In ladle refining furnace LF, with binary slag system, described molten steel is carried out desulfurization process, when needing the sulfur content in described molten steel is reduced to below 30PPM, desulfurization process is again carried out to carrying out the molten steel after desulfurization process with binary slag system by ternary slag system, wherein, described binary slag system is calcia-silica CaO-SiO2Binary slag system, the content of described CaO range for 55%～65%, described SiO2Content range for 15%～25%.
2. the method for claim 1, it is characterised in that the content of described CaO is 62%, described SiO2Content be 20%.
3. the method for claim 1, it is characterised in that described ternary slag system is calcia-silica-aluminium oxide CaO-SiO2-Al2O3Ternary slag system.
4. method as claimed in claim 3, it is characterised in that the content of described CaO range for 50%～60%, described SiO2Content range for less than 13%, described Al2O3Content range for 25%～35%.
5. method as claimed in claim 3, it is characterised in that the content of described CaO is 55%, described SiO2Content be 8%, described Al2O3Content be 28%.
6. the method as described in as arbitrary in Claims 1 to 5, it is characterised in that after by slag system described molten steel being carried out desulfurization process in ladle refining furnace LF, also include:
Molten steel after desulfurization being processed in vacuum outgas VD stove carries out Calcium treatment.
7. the method as described in as arbitrary in Claims 1 to 5, it is characterized in that, molten iron is carried out after electric furnace steel making obtains molten steel in converter, also include before by slag system described molten steel being carried out desulfurization process in ladle refining furnace LF: the molten steel obtained is carried out pre-deoxidation process.
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| CN110982988B (en) * | 2019-12-25 | 2021-08-13 | 河钢股份有限公司承德分公司 | Desulfurization method for promoting contact of steel slag in LF refining furnace and steel-making method |
| CN112011668B (en) * | 2020-08-30 | 2021-11-12 | 中南大学 | Production process for improving desulfurization efficiency in EAF-LF molten steel refining process |
| CN113088612A (en) * | 2021-03-15 | 2021-07-09 | 石家庄钢铁有限责任公司 | Method for pretreating and desulfurizing molten iron by using LF (ladle furnace) |
| CN113151635A (en) * | 2021-03-30 | 2021-07-23 | 江苏永钢集团有限公司 | Production process of steel pipe for crane boom |
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