CN1056415C - Aluminium-contained premelting slag and preparation method therefor, and molten steel desulfurizer and purifier containing same - Google Patents
Aluminium-contained premelting slag and preparation method therefor, and molten steel desulfurizer and purifier containing same Download PDFInfo
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Abstract
The present invention relates to premelting slag with aluminium, a preparation method, and a molten steel desulfurizer with the slag, and a purifier with the slag, which belongs to the technical field of steel production. The premelting slag with aluminium of the present invention is placed in a metallurgy smelting furnace and is heated; after the premelting slag with aluminium is completely smelted, any kind or more than one kind of AlF3 or CaF2 or CaCl2 or AlCl3 is added for continuous heating; when the temperature of smelting solution exceeds 1450 DEG C, a slag adjusting agent of SiO2 and MgO is added; the slag is adjusted according to the components of finial slag; the obtained components of the premelting slag with aluminium (weight percentage) are 12% to 15% of metal Al, 65% to 75% of Al2O3, 2% to 10% of the SiO2, 2% to 6% of the MgO and 3% to 10% of any kind or more than one kind of the AlF3 or the CaF2 or the CaCl2 or the AlCl3; after the premelting slag with aluminium is uniformly mixed with CaO, CaC2, CaCO3, C, etc., different types of desulfurizers of the premelting slag with aluminium can be prepared; different types of molten steel purifiers of the premelting slag with aluminium can be obtained by directly using the premelting slag with aluminium or mixing the premelting slag with aluminium, Si-Fe, Be, BaO or mixed rare earth oxide.
Description
The invention relates to aluminum-containing slag, a preparation method thereof, and a molten steel desulfurizing agent and a purifying agent containing the slag.
At present, the metals Al and Al are frequently used in the steel-making process2O3And desulfurizing and deoxidizing the aluminum slag containing other impurities. However, the aluminum slag is powder, so that the aluminum slag is inconvenient to use and easy to take away by smoke dust, and the utilization rate of the aluminum slag is low. For this purpose, US5385601 presents a method for premelting aluminium slags for the manufacture of calcium aluminate used as a desulphurizing agent. However, the product obtained by the method is suitable for desulfurization and not suitable for deoxidation and purification of molten steel, and has high cost.
The invention aims to provide an aluminum-containing premelting slag and a preparation method thereof, wherein the aluminum-containing premelting slag comprises the following chemical components: metal Al, Al2O3，SiO2，MgO，AlF3Or CaF2Or CaCl2Or AICl3Any one or more of them. The preparation method of the aluminum-containing premelting slag comprises the following steps of taking aluminum slag generated in the processing and smelting process of electrolytic aluminum and aluminum products as raw materials, and after part of aluminum is recovered from the aluminum slag, the rest part of the aluminum slag comprises the following components: 15-18% of Al, Al2O360～70％，SiO25-8 percent of aluminum-containing slag, 3-5 percent of MgO and other small amount of oxide impurities, melting the aluminum-containing slag, and adding a small amount of chloride, fluoride activator and SiO2And MgO and the like to obtain the aluminum-containing premelting slag which is easy to form slag.
Another object of the invention is to provide a desulphurating agent formulated with an aluminium-containing premelting slag, obtained by adding other metallurgical auxiliary materials, such as CaO, CaC, to the aluminium-containing premelting slag2、CaCO3And C, preparing different types of aluminum-containing premelting slag desulfurizing agents after uniformly mixing, and further enhancing the metallurgical property of the aluminum-containing premelting slag and improving the desulfurizing effect when in use.
Another object of the present invention is to provide a molten steel purifying agent prepared from aluminum-containing pre-melted slag, whichcan be obtained by adding other metallurgical auxiliary materials such as Si-Fe, BaO or mixed rare earth oxide into the aluminum-containing pre-melted slag. When in use, the metallurgical performance of the aluminum-containing premelting slag can be further enhanced, the slagging speed is improved, and the capability of capturing oxide inclusions in molten steel is enhanced.
In addition, the aluminum-containing premelting slag of the invention can also be directly used as a molten steel purifying agent.
The purpose of the invention is realized as follows:
the chemical components of the aluminum-containing premelting slag of the invention are (weight percent):
12-15% of metal Al, and Al2O365～75％，SiO22～10％，MgO 2～6％，AlF3Or CaF2Or CaCl2Or AlCl33 to 10% of one or more of them.
The preparation method of the aluminum-containing premelting slag comprises the following steps:
the method takes the aluminum slag generated in the processing and smelting process of electrolytic aluminum and aluminum products as raw materials, and after part of aluminum is recovered from the aluminum slag, the rest part is composed of the following components: 15-18% of Al, Al2O360～70％，SiO25-8 percent of aluminum-containing slag, 3-5 percent of MgO and a small amount of other oxide impurities, then putting the aluminum-containing slag into a metallurgical melting furnace, heating to 1350-1430 ℃, and adding AlF according to a melting slag sample after the aluminum-containing slag is melted3、CaF2、CaCl2Or AlCl3Any one or more of them, heating continuously, and meltingWhen the temperature of the liquid exceeds 1450 ℃, SiO is added2And MgO slag modifier according to the final slag componentCarrying out slag mixing; and keeping the liquid slag for more than 30 minutes to ensure that the liquid slag is discharged after being sufficiently and uniformly, thereby obtaining the aluminum-containing pre-melted slag.
After the slag is discharged, air cooling or natural cooling is adopted, and then a crusher is used for processing powdery aluminum-containing pre-melted slag with the granularity of less than 0.1 mm.
Preparing lime base and CaC from the powdery aluminum-containing premelting slag2Two types of desulfurizing agents were molded:
1. aluminium-containing premelting slag lime base desulfurizing agent
Mixing the powdery aluminum-containing premelting slag with powdery CaO and CaCO3And C, fully and uniformly mixing to prepare the aluminum-containing premelted slag lime-based desulfurizer, which comprises the following components in percentage by weight:
8-22% of aluminum-containing premelting slag, 55-70% of CaO and CaCO36～20％，C 1～3％。
The powdery CaO and CaCO3And the granularity of C is less than or equal to 0.6 mm.
2. Aluminium-containing premelting slag CaC2Shaped desulfurizer
Mixing the powdery aluminum-containing premelting slag and powdery CaC2、CaO、CaCO3Mixing with C, and making into aluminum-containing premelted slag CaC2The desulfurizer comprises the following components in percentage by weight:
8-22% of aluminum-containing premelting slag and CaC220～35％，CaO 40～58％，CaCO36～20％，C 1～3％。
The powdery CaC2、CaO、CaCO3And the granularityof C is less than or equal to 0.6 mm.
The CaC added in the preparation process of the desulfurizer2CaO is not affected by moisture or hydrolysis. The water content of all the raw materials is less than 0.05%, and if necessary, the raw materials can be dried and baked before processing.
The powdery aluminum-containing premelting slag is used for preparing the following four molten steel purifiers:
1. the aluminum-containing premelting slag can be directly used as a molten steel purifying agent.
2. Aluminum-containing premelting slag Si-Fe molten steel purifying agent
Mixing the powdery aluminum-containing premelting slag with 75% of Si-Fe to ensure that the components are as follows (by weight percent):
40-48% of aluminum-containing premelting slag and 52-60% of 75% Si-Fe.
The granularity of the 75 percent Si-Fe is less than or equal to 1 mm.
3. Aluminum-containing premelted slag BaO molten steel purifying agent
Mixing the powdery aluminum-containing premelting slag and powdery BaO to ensure that the components are as follows (by weight percent):
80-85% of aluminum-containing premelting slag and 15-20% of BaO.
4. Molten steel purifying agent containing aluminium premelting slag mixed with rare earth oxide
Mixing the powdery aluminum-containing premelting slag and powdery mixed rare earth oxide to ensure that the components are as follows (by weight percent):
95-97% of aluminum-containing premelting slag and 3-5% of mixed rare earth oxide.
The aluminum-containing premelting slag, the desulfurizing agent and the molten steel purifying agent are described below:
one, 12-15% of metal Al, Al2O365～75％，SiO22～l0％，MgO 2～6％，AlF3Or CaF2Or CaCl2Or AlCl33-10% of one or more aluminum-containing pre-melted slag.
In CaO-Al2O3In the phase diagram, the main structure of the aluminum-containing premelting slag is 12 CaO.7Al2O3Is a low melting point solid solution, and then AlF is added3Or CaF2Or CaCl2Or AlCl3Then the melting point is further reducedLow.
Secondly, an aluminum-containing premelting slag desulfurizer
1. The aluminum-containing premelting slag lime-based desulfurizer consists of aluminum-containing premelting slag, CaO and CaCO3And C, which is mainly used for the desulfurization of molten iron and molten steel of a blast furnace type. Spraying the aluminum-containing premelting slag desulfurizer into molten iron or molten steel, and premelting Al and Al in the aluminum-containing premelting slag2O3，SiO2And MgO and the like under the catalytic action of chloride or fluoride, rapidly forms 12 CaO.7 Al with elements such as CaO and the like2O3The multi-element slag system is mainly used, which is very beneficial to the diffusion of S ions in the slag;meanwhile, metal Al and CaO react rapidly, and the chemical equation is as follows:
2. The aluminum-containing premelting slag CaC2Shaped desulfurizing agent for removing premelting slag and CaC containing aluminium2、CaO、CaCO3And in addition to C, CaC2It is mainly used for the desulfurization of molten iron and molten steel of blast furnace type. Added CaC2The compound is a strong desulphurizer, and the chemical reaction formula is as follows:
the aluminum-containing premelting slag desulfurizer can meet higher alkalinity, low oxidability and low melting point, so the thermodynamic condition is superior to that of the common desulfurizer, and the slagging speed and the CaC in the metallurgical desulfurization process2The utilization rate of CaO is higher than that of a common desulfurizer, generally 2 times of that of the common desulfurizer, and the treatment temperature is lower than that of the common desulfurizer, so that thermodynamic and kinetic conditions of desulfurization reaction are greatly improved, and the method is very favorable for a metallurgical process.
The aluminium-containing premelting slag desulfurizer of the invention uses a jet machine to produce N2As a carrier (N)2The pressure is 6-8 Mpa/cm2) Spraying the mixture into a ladle for desulfurization. The spray gun is inserted into molten iron, and the insertion depth is 1/3-1/2 of the height of the molten iron. The amount of the desulfurizing agent is different according to the original sulfur content of the molten iron and the temperature of the molten iron, and is generally usedThe amount is 8-12 kg/ton iron. Selecting an aluminum-containing premelted slag lime base or CaC according to the requirements of different sulfur contents for smelting steel seeds2A molded desulfurizing agent. In general, [ S]after desulfurization of molten iron is required]Using CaC at 0.005 or less2Shaped desulfurizer, S after desulfurization of molten iron]When the desulfurization rate is less than or equal to 0.01, the aluminum-containing premelting slag lime-based desulfurizer is used, and the desulfurization rate can reach 80-95%.
Aluminum-containing premelted slag molten steel purifying agent
1. The aluminum-containing premelting slag can be directly used as a molten steel purifying agent
The aluminum-containing premelting slag is made of metal Al and Al2O3，SiO2，MgO，AlF3Or CaF2Or CaCl2Or AlCl3Any one or more of them.
In the molten steel purification process, the deoxidation depth of the molten steel is very important, and the deoxidation products are removedThe limiting part of the process. Because the aluminum-containing premelting slag is used as the molten steel purifying agent, the premelting slag has low melting point, good activity and high slagging speed, and the slag has Al with stronger deoxidizing capacity, so that the deoxidizing capacity of the steel slag can be greatly improved. The low-melting-point active slag is used for capturing and quickly floating oxides in the molten steel, so that deoxidation products in the molten steel can be removed, and the cleanliness of the molten steel is improved. In addition, because the aluminum-containing premelting slag contains chemical compounds such as halogen compounds and the like, the aluminum-containing premelting slag has good spreadability, is beneficial to covering the surface of molten steel, reduces the contact surface of the molten steel and air, reduces the oxidation of oxygen in the air to the surface of the molten steel, and plays a role in protecting the molten steel. Small amount of SiO2MgO can reduce the melting point of the whole slag phase to form a multi-component compound.
2. The aluminum-containing premelting slag Si-Fe molten steel purifying agent consists of aluminum-containing premelting slag and Si-Fe.
The aluminum-containing pre-melted slag in the purifying agent has the function as described above, the Si-Fe mixed in the aluminum-containing pre-melted slag is matched with the Al in the aluminum-containing pre-melted slag, the deoxidizing capacity to molten steel can be enhanced, and the Si-Fe added can reduce the cost of the purifying agent.
3. The molten steel purifying agent of the aluminum-containing premelting slag BaO consists of the aluminum-containing premelting slag and the BaO.
The aluminum-containing premelting slag in the purifying agent has the function as described above, and after powdery BaO is mixed into the aluminum-containing premelting slag, strip-shaped silicon-aluminum oxide inclusions in steel can be spheroidized and uniform, so that the mechanical property of the steel is improved, the quality of the steel and the processing performance of steel are improved, and the aim of purifying molten steel is fulfilled.
4. The molten steel purifying agent of the mixed rare earth oxide containing the aluminum premelting slag consists of the aluminum-containing premelting slag and the mixed rare earth oxide.
The aluminum-containing premelting slag in the purifying agent has the function as described above, and after the rare earth oxide is mixed into the aluminum-containing premelting slag, strip-shaped silicon-aluminum oxide inclusions in steel can be spheroidized and uniform, and the inclusions are dispersed, so that the mechanical property of the steel is improved, the quality of the steel and the processing performance of steel are improved, and the aim of purifying molten steel is fulfilled.
The four aluminum-containing premelted slag molten steel purifiers are suitable for all molten steel.
The aluminum-containing premelting slag molten steel purifiers can be used for converter steelmaking, electric furnace steelmaking or external refining (LF, LF-VD, RH and the like) ladles, for example, when the 1 st aluminum-containing premelting slag molten steel purifiers are used, in the converter steelmaking process, the molten steel is poured into the ladles from the upper side of the ladles when the molten steel is about 1/5, the aluminum-containing premelting slag molten steel purifiers are added, the adding amount is 2-4 kg/t of steel according to the difference of steel types, for example, when the aluminum-containing premelting slag purifiers are used in the electric furnace steelmaking process, two adding methods are adopted according to the difference of steel tapping methods, namely, ① EBT steel tapping method is adopted, the aluminum-containing premelting slag purifiers are added into the ladles before steel tapping, the adding amount is 3-5 kg/t of steel, for ② for non-EBT steel tapping method, the aluminum-containing premelting slag purifiers are added into the furnace during the reduction period, the steel and the molten steel is refined during external refining (LF, LF-VD and RH and the molten steel surface purifiers are added into the ladles, wherein the molten steel surface refining (LF.
The aluminum-containing premelting slag, the desulfurizer and the molten steel purifying agent have the following effects:
compared with the existing aluminum slag or pre-melted aluminum slag, the aluminum-containing pre-melted slag has low cost and wide application.
Two, instituteThe two aluminum-containing premelting slag desulfurizing agents have the desulfurizing effects that: the desulfurization rate of the aluminum-containing premelting slag lime-based desulfurizer can reach 75-95%. The desulfurization time is about 15 minutes, theThe dosage of the desulfurizer is different according to the original sulfur content of the molten iron and the temperature of the molten iron, and the general dosage is 8-12 kg per ton of iron; the aluminum-containing premelting slag CaC2The desulfurization rate of the desulfurizer can reach 75-95%. The desulfurization time is about 15 minutes, the dosage of the desulfurizer is different according to the original sulfur content of the molten iron and the temperature of the molten iron, and the dosage is generally 8-12 kg per ton of iron.
And thirdly, the four aluminum-containing premelted slag molten steel purifiers have the following using effects:
1. in the converter steelmaking process, the oxygen content of molten steel is less than or equal to 30-40 ppm [ O], the total oxygen content in steel is less than 60ppm, and the oxide inclusion grade in steel billet is less than 0.5 grade.
2. In the electric furnace steelmaking process, the oxygen content in the steel reaches [ O]less than or equal to 20ppm, and the total oxygen content in the steel is less than 50 ppm.
3. During the external refining, molten steel purifying agent is added to replace deoxidant to further deoxidize, so that the oxygen content in steel is less thanor equal to 20ppm and the total oxygen content in steel is less than 50 ppm.
Example (b):
1. examples of aluminium-containing premelting slags
33kg of a catalyst containing Al and Al as metals2O3The slag material is firstly melted in a medium frequency induction furnace at 1380 ℃, and AlF is added according to a melted slag sample after the aluminum slag is melted3And AlCl31.1kg each, heating, and adding 3kg SiO when the melt temperature exceeds 1450 deg.C2And 2kgMgO slag modifier, which is used for completely melting the slag and carrying out slag modification according to the final slag components; keeping the liquid slag for 40 minutes, and discharging the slag after the liquid slag is sufficiently and uniformly; the final slag comprises the following components (in percentage by weight):
metal Al 12%, Al2O370％，SiO27％，MgO 5％，AlF33％，AlCl33％。
After slag discharge, air cooling is adopted, and then a crusher is used for processing powdery aluminum-containing pre-melted slag with the granularity of less than 0.1 mm.
2. Examples of desulfurizing agent for premelted slag containing aluminum
(1) Aluminum-containing premelting slag lime-based desulfurizing agent
Adding CaO and CaCO powder with granularity less than or equal to 0.6mm into the aluminum-containing premelting slag3And C, fully and uniformly mixing the components and packaging the mixture to prepare the aluminum-containing premelted slag lime-based desulfurizer, wherein the mixture ratio (weight percent) of the aluminum-containing premelted slag lime-based desulfurizer is as follows:
12 percent of aluminum-containing premelting slag, 65 percent of CaO and CaCO320％，C 3％
The aluminum-containing premelting slag lime-based desulfurizer is used for desulfurizing blast furnace molten iron, the molten iron amount is 300 tons, the sulfur agent addition amount is 3000kg, the sulfur content of the original molten iron is 0.025 percent, and the molten iron temperature is 1350 ℃. Inserting a spray gun made of refractory material into a molten iron ladle car, wherein the insertion depth is 1.6m and is 7MPa/cm2N of pressure2The desulfurizer with the granularity of less than or equal to 0.6mm is blown into molten iron by a carrier, the blowing time is 15 minutes, the sulfur content in the blown molten iron is 0.004, the desulfurization rate is 84%, and the desulfurization time is 15 minutes.
(2) Aluminium-containing premelting slag CaC2Shaped desulfurizer
Adding the aluminum-containing premelting slag into powder CaC with the granularity less than or equal to 0.6mm2、CaO、CaCO3And C, fully mixing the mixture and packaging the mixture to prepare the aluminum-containing premelting slag CaC2The desulfurizer is prepared from the following components in percentage by weight:
12% of pre-melted slag containing aluminium and CaC225％，CaO 50％，CaCO310％，C 3％。
The aluminum-containing premelting slag lime-based desulfurizer is used for desulfurizing blast furnace molten iron, the molten iron amount is 300 tons, the sulfur agent addition amount is 3000kg, the sulfur content of the original molten iron is 0.025 percent, and the molten iron temperature is 1350 ℃. Inserting a spray gun made of refractory material into a molten iron ladle car, wherein the insertion depth is 1.6m and is 7MPa/cm2N of pressure2The desulfurizer with the granularity of less than or equal to 0.6mm is injected into molten iron by a carrier, the injection time is 15 minutes, the sulfur content in the molten iron after injection is 0.0035, and the desulfurization rate is 86 percentThe desulfurization time was 15 minutes.
3. Examples of aluminum-containing premelted slag molten steel purifiers
(1) And uniformly mixing the powdery aluminum-containing premelting slag and portland cement with the granularity less than 1mm, and punching the mixture into a blocky molten steel purifying agent, wherein the blocky degree of the briquetting is 50 mm. The weight portions of the components are as follows:
aluminum-containing premelting slag: portland cement 1: 5%
In the converter steelmaking, 30 tons of molten steel which is qualified in smelting is poured into a ladle, and when about 1/5 tons of molten steel is poured, 90kg of the block-shaped molten steel purifying agent is poured into the ladle from the side upper side of the ladle while a pre-deoxidizer added according to a conventional method is cancelled, so that the oxygen content of the molten steel is reduced to 35ppm, the total oxygen content of the steel is 55ppm, and the oxide inclusion grade of the steel billet is 0.4 grade.
(2) Mixing the powder aluminum-containing premelting slag with 75% of Si-Fe with the granularity less than or equal to 1mm, and enabling the mixture ratio to be (weight%):
45 percent of aluminum-containing premelting slag and 55 percent of 75 percent of Si-Fe
Then evenly mixing the cleaning agent with a Portland cement binder with the granularity less than 1mm, and punching the cleaning agent into blocks, wherein the block degree of the blocks is 50 mm.
The weight portion ratio of the mixture of the aluminum-containing premelting slag and 75% of Si-Fe to the Portland cement is as follows: (aluminium-containing premelting slag + 75% Si-Fe) and silicate cement 1: 6%
When the block-shaped molten steel purifying agent is used in electric furnace steelmaking, two adding methods are adopted according to different tapping modes:
① EBT steel tapping method, adding it into ladle before tapping, adding 4kg/t steel, then injecting 30 tons of qualified molten steel into ladle, the oxygen content in steel is 18ppm, total oxygen content in steel is 45 ppm.
② for non-EBT tapping, the steel was charged into the furnace during the reduction phase in an amount of 4kg/t steel, and the steel and slag were mixed out during tapping and poured into a ladle, resulting in an oxygen content [ O]-17 ppm and a total oxygen content of 47ppm in the steel.
(3) Mixing the powdery aluminum-containing premelting slag with powdery BaO to ensure that the mixture ratio is (weight percent):
83 percent of aluminum-containing premelting slag and 17 percent of BaO
Then evenly mixing the cleaning agent with a Portland cement binder with the granularity less than 1mm, and punching the cleaning agent into blocks, wherein the block degree of the blocks is 50 mm.
The weight portion ratio of the mixture containing the aluminum premelting slag and the BaO and the Portland cement obtained by the mixture ratio is as follows:
(aluminium-containing premelting slag + BaO) and silicate cement 1: 5%
In the process of external refining (LF), 30 tons of qualified molten steel is poured into a ladle, the massive molten steel purifying agent is added into the surface of steel slag to producereducing slag, deoxidizer is replaced, and the molten steel is refined, wherein the adding amount is 1.5kg/t steel. As a result, the oxygen content in the molten steel was 18ppm and the total oxygen content in the steel was 48 ppm.
4. Mixing the powdery aluminum-containing premelting slag and powdery mixed rare earth oxide according to the following mixture ratio (weight percent):
96 percent of aluminum-containing premelting slag and 4 percent of mixed rare earth oxide
Then evenly mixing the molten steel cleaning agent with a Portland cement binder with the granularity less than 1mm, and rolling the mixture into a blocky molten steel cleaning agent, wherein the blocky degree of the briquetting is 50 mm.
The weight portion ratio of the mixture of the aluminum-containing premelting slag and the mixed rare earth oxide to the portland cement obtained by the mixture ratio is as follows:
(aluminium-containing premelting slag + BaO) and silicate cement 1: 5%
In the process of external refining (LF), 30 tons of qualified molten steel is poured into a ladle, the massive molten steel purifying agent is added into the surface of steel slag to produce reducing slag, deoxidizer is replaced, and the molten steel is refined, wherein the adding amount is 1.5kg/t steel. As a result, the oxygen content in the molten steel became 17ppm (O), and the total oxygen content in the steel was 47 ppm.
Claims (10)
1. An aluminium-containing premelting slag, which comprises the following components (by weight percent):
12-15% of metal Al, and Al2O365～75％，SiO22～10％，MgO 2～6％，AlF3Or CaF2Or CaCl2Or AlCl33 to 10% of one or more of them.
2. An aluminium-containing premelt slag according to claim 1 wherein the aluminium-containing premelt slag has a particle size of less than 0.1 mm.
3. A method for preparing the pre-melted slag containing aluminum as claimed in claim 1, wherein the aluminum slag generated in the process of processing and smelting the electrolytic aluminum and the aluminum products is used as a raw material, after a part of aluminum is recovered from the aluminum slag, the rest part of the aluminum slag is composed of: 15-18% of metal Al, and Al2O360～70％，SiO25-8 percent of aluminum-containing slag, 3-5 percent of MgO and a small amount of other oxide impurities, then putting the aluminum-containing slag into a melting furnace, heating the aluminum-containing slag to 1350-1430 ℃, and adding AlF according to a slag sample of a molten slag after the aluminum-containing slag is molten down3、CaF2、CaCl2Or AlCl3Heating, and adding SiO when the melt temperature exceeds 1450 deg.C2And MgO slag modifier, which is used for modifying slag according to the final slag component, keeping the liquid slag for more than 30 minutes, and discharging the slag after the liquid slag is fully and uniformly, wherein the final slag component is the aluminum-containing pre-melted slag in claim 1.
4. An aluminium-containing premelting slag desulphurating agent as claimed in claim 1, having a composition (in% by weight):
8-22% of aluminum-containing premelting slag, 55-70% of CaO and CaCO36～20％，C 1～3％。
5. An aluminium-containing premelting slag desulphurating agent as claimed in claim 1, having a composition (in% by weight):
8-22% of aluminum-containing premelting slag and CaC220～35％，CaO 40～58％，CaCO36～20％，C 1～3％。
6. The aluminum-containing premelting slag desulfurizing agent according to claim 4 or 5, wherein said aluminum-containing premelting slag desulfurizing agentCaO、CaCO3、CaC2And the granularity of C is less than or equal to 0.6 mm.
7. An aluminum-containing premelted slag molten steel cleaning agent as defined in claim 1, which comprises (by weight%):
40-48% of aluminum-containing premelting slag and 52-60% of 75% Si-Fe.
8. The aluminum-containing premelted slag molten steel scavenger according to claim 7, wherein said 75% Si-Fe has a particle size of 1mm or less.
9. An aluminum-containing premelted slag molten steel cleaning agent as defined in claim 1, which comprises (by weight%):
80-85% of aluminum-containing premelting slag and 15-20% of BaO.
10. An aluminum-containing premelted slag molten steel cleaning agent as defined in claim 1, which comprises (by weight%):
95-97% of aluminum-containing premelting slag and 3-5% of mixed rare earth oxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98101510A CN1056415C (en) | 1998-04-07 | 1998-04-07 | Aluminium-contained premelting slag and preparation method therefor, and molten steel desulfurizer and purifier containing same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98101510A CN1056415C (en) | 1998-04-07 | 1998-04-07 | Aluminium-contained premelting slag and preparation method therefor, and molten steel desulfurizer and purifier containing same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1201072A CN1201072A (en) | 1998-12-09 |
| CN1056415C true CN1056415C (en) | 2000-09-13 |
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| CN98101510A Expired - Fee Related CN1056415C (en) | 1998-04-07 | 1998-04-07 | Aluminium-contained premelting slag and preparation method therefor, and molten steel desulfurizer and purifier containing same |
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Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1324150C (en) * | 2005-03-30 | 2007-07-04 | 上海宝越耐火材料有限公司 | Slag from aluminum smelting for making clean steel and method for preparing same |
| CN100422349C (en) * | 2005-10-11 | 2008-10-01 | 梅一峰 | Prefused refined slag modified aluminium slag ball and its preparing method |
| WO2009152643A1 (en) * | 2008-06-19 | 2009-12-23 | 鞍钢股份有限公司 | An additive used in secondary refining process, the producing method and the application thereof |
| CN100552052C (en) * | 2008-07-11 | 2009-10-21 | 鞍钢股份有限公司 | Process for preparing fine oxide dispersion steel |
| CN100552053C (en) * | 2008-07-17 | 2009-10-21 | 鞍钢股份有限公司 | Method for preparing fine oxide dispersion steel |
| CN101319269B (en) * | 2008-07-23 | 2010-09-08 | 鞍钢股份有限公司 | Process method for refining process desulfurization |
| CN101838720B (en) * | 2009-03-16 | 2011-11-30 | 上海梅山钢铁股份有限公司 | Composite modification material for reducing oxidizability of molten low-carbon-aluminum killed steel |
| CN102344996A (en) * | 2010-08-06 | 2012-02-08 | 丹东泓辉科大高温材料有限公司 | Aluminium-silica type refined pre-smelting slag |
| CN102002550A (en) * | 2010-12-09 | 2011-04-06 | 湖南华菱湘潭钢铁有限公司 | Slag modifier for converter refining |
| CN102181605A (en) * | 2011-04-07 | 2011-09-14 | 重庆钢铁(集团)有限责任公司 | Molten steel deoxidizing modifier |
| CN102528004A (en) * | 2012-02-23 | 2012-07-04 | 西北工业大学 | Supercooled IN718 high-temperature alloy purifying agent and preparation method for same |
| CN103966453A (en) * | 2013-01-30 | 2014-08-06 | 郑州威尔特材有限公司 | Method for producing premelting-type calcium aluminate from electrolytic aluminum waste residue |
| CN103243197B (en) * | 2013-05-13 | 2014-12-31 | 涟源市飞达冶金炉料厂 | Novel direct continuous casting slag washing mixed material and preparation process thereof |
| CN111363888B (en) * | 2020-03-20 | 2021-11-23 | 莱芜钢铁冶金生态工程技术有限公司 | KR desulfurizer as well as preparation method and application thereof |
| CN111286582A (en) * | 2020-03-24 | 2020-06-16 | 芜湖新兴铸管有限责任公司 | Composite refined pellet, preparation method thereof and steelmaking slagging method |
| CN111979376B (en) * | 2020-09-24 | 2022-11-04 | 李杉 | Lime-based molten iron desulfurizing agent and preparation method thereof |
| CN113388716B (en) * | 2021-05-24 | 2022-10-18 | 鞍钢股份有限公司 | Fluorine-free composite molten iron desulfurizing agent and preparation method thereof |
| CN113403451A (en) * | 2021-05-24 | 2021-09-17 | 鞍钢股份有限公司 | Fluorine-free spherical slag for molten iron desulphurization and preparation method thereof |
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| US4941914A (en) * | 1989-05-18 | 1990-07-17 | Elkem Metals Company | Desulfurization agent |
| JPH06200317A (en) * | 1992-12-28 | 1994-07-19 | Kawasaki Steel Corp | Method for melting high cleanliness steel |
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| US5407459A (en) * | 1993-09-23 | 1995-04-18 | Alcan International Limited | Process for the preparation of calcium aluminates from aluminum dross residues |
| JPH08290915A (en) * | 1995-03-24 | 1996-11-05 | Hoogovens Staal Bv | Method for processing aluminum floating sludge and residue of alminum floating sludge into calcium alminate |
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Patent Citations (5)
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| US4941914A (en) * | 1989-05-18 | 1990-07-17 | Elkem Metals Company | Desulfurization agent |
| JPH0741824A (en) * | 1991-08-21 | 1995-02-10 | Kawasaki Steel Corp | Production of high cleanliness steel |
| JPH06200317A (en) * | 1992-12-28 | 1994-07-19 | Kawasaki Steel Corp | Method for melting high cleanliness steel |
| US5407459A (en) * | 1993-09-23 | 1995-04-18 | Alcan International Limited | Process for the preparation of calcium aluminates from aluminum dross residues |
| JPH08290915A (en) * | 1995-03-24 | 1996-11-05 | Hoogovens Staal Bv | Method for processing aluminum floating sludge and residue of alminum floating sludge into calcium alminate |
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| CN1201072A (en) | 1998-12-09 |
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