CN111069543B - Low-carbon alkaline molten steel heat-preservation covering agent and preparation method thereof - Google Patents
Low-carbon alkaline molten steel heat-preservation covering agent and preparation method thereof Download PDFInfo
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- CN111069543B CN111069543B CN201911342454.6A CN201911342454A CN111069543B CN 111069543 B CN111069543 B CN 111069543B CN 201911342454 A CN201911342454 A CN 201911342454A CN 111069543 B CN111069543 B CN 111069543B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material
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Abstract
The invention belongs to the technical field of ferrous metallurgy auxiliary materials, and particularly discloses a low-carbon alkaline molten steel heat-preservation covering agent and a preparation method thereof, wherein the low-carbon alkaline molten steel heat-preservation covering agent comprises the following components in percentage by mass: 35-50% of LF refining tailings, 25-40% of blast furnace slag particles, 5-10% of coke powder, 8-15% of unexpanded vermiculite and 5-10% of fluorite. The preparation method comprises the following steps: weighing the components according to the mass percentage, mixing and then carrying out wet grinding to obtain the low-carbon alkaline molten steel heat-preservation covering agent. The covering agent is low in development cost and realizes efficient utilization of LF refining tailings.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy auxiliary materials, in particular to a low-carbon alkaline molten steel heat-preservation covering agent and a preparation method thereof.
Background
The LF refined steel slag is rich in CaO and A1 generated after the high-quality steel is subjected to external LF refining after the steel is tapped from a converter2O3、SiO2Alkaline or highly alkaline slag. At present, LF refining steel slag is treated by adopting a converter steel slag treatment process, and most of the slag is treatedAfter the iron is recovered, the residual tailings are not reasonably utilized, and can only be stacked in large quantity, so that the method not only occupies land and pollutes the environment, but also leads to the condition of being rich in CaO and A12O3、SiO2And the waste and the loss of useful resources.
The molten steel heat-preserving covering agent is a molten steel heat-preserving material added to the surface of molten steel after steel is tapped from a steel-making furnace in order to avoid the phenomenon that the temperature of the molten steel is too fast in the casting process because the molten steel is directly exposed in air. The traditional molten steel heat-preservation covering agent uses carbonized rice hulls, but the carbonized rice hulls have high carbon content, are not easy to form a liquid slag layer, have poor secondary oxidation prevention effect and are easy to cause recarburization of molten steel. With the increasing smelting of low-carbon and ultra-low-carbon steel, the requirements on the molten steel heat-insulating covering agent are higher and higher, and the development of low-carbon alkaline heat-insulating covering agent with low cost is urgently needed.
Disclosure of Invention
The invention aims to provide a low-carbon alkaline molten steel heat-preservation covering agent which is low in development cost and realizes efficient utilization of LF refining tailings. The invention is rich in CaO and A12O3、SiO2The LF refining tailings are used as a basis and are added with blast furnace slag particles, coke powder, unexpanded vermiculite, fluorite and other auxiliary materials produced by iron and steel enterprises to produce the medium-carbon or low-carbon alkaline molten steel heat-insulating covering agent with low cost, so that the problem of recycling of the LF refining slag is solved, and the purposes of environment protection and clean production are achieved.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the low-carbon alkaline molten steel heat-preservation covering agent is characterized by comprising the following components in percentage by mass: 35-50% of LF refining tailings, 25-40% of blast furnace slag particles, 5-10% of coke powder, 8-15% of unexpanded vermiculite and 5-10% of fluorite.
In the invention, the medium-carbon alkaline molten steel heat-preservation covering agent is a uniform powdery substance, wherein the proportion of the part with the particle size of less than 1mm is not less than 70 percent by mass, the proportion of the part with the particle size of 1-2 mm is less than 30 percent by mass, and the moisture content is not higher than 1 percent by mass.
In the present invention,the LF refining tailings are the tailings left after cooling, crushing and magnetic separation of LF external refining steel slag, and minerals contained in the tailings are tricalcium silicate (C)3S), dicalcium silicate (C)2S), calcium aluminate (C)12A7) Belongs to the calcium aluminate slag system; the CaO content in the tailings is more than 45 percent by mass, and Al2O3The mass content is more than 15 percent.
In the present invention, the blast furnace slag granules are granulated blast furnace slag quenched by the charla method. The slag particles are melt which is mainly composed of calcium magnesium silicate and calcium magnesium aluminosilicate and is formed by combining gangue, fuel ash, added slag former and the like in iron ore during blast furnace smelting, and the melt is quenched by a drawing method to obtain water-quenched blast furnace slag particles, wherein the appearance of the water-quenched blast furnace slag particles is light yellow, and the alkalinity coefficient is more than 1.
In the invention, the coke powder is metallurgical coke powder, the mass content of fixed carbon is more than 80%, and the mass content of ash is more than 10%.
In the invention, the unexpanded vermiculite is a layered structure magnesium-containing aluminosilicate secondary metamorphic mineral, is mica-like in appearance, is a layered structure silicate, and can expand by more than 20 times when heated to more than 300 ℃.
The invention also provides a preparation method of the medium-carbon alkaline molten steel heat-preservation covering agent, which comprises the following steps:
weighing the components according to the mass percent, mixing and then carrying out wet grinding to obtain the medium-carbon alkaline molten steel heat-preservation covering agent.
Preferably, the duration of the wet-milling is 40 to 60 minutes.
Compared with the prior art, the invention has the beneficial effects that:
the invention skillfully utilizes the rich CaO and A1 in the LF refining tailings2O3、SiO2The low-carbon alkaline molten steel heat-preservation covering agent is produced by adding the blast furnace slag particles, the coke powder, the unexpanded vermiculite and the fluorite which are solid wastes, so that the high-efficiency full utilization of LF refining tailings is realized, and the improvement of the production environment of a steel plant and the implementation of circular economic work are facilitated; the production cost of the low-carbon alkaline molten steel heat-preservation covering agent is greatly reduced by more than 50%, and the economic benefit is remarkable.
Drawings
FIG. 1 is a flow chart of the preparation method of the low-carbon alkaline molten steel heat-preserving covering agent of the invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the detailed description.
Example 1:
as shown in figure 1, the low-carbon alkaline molten steel heat-preservation covering agent prepared by using LF refining tailings provided by the invention comprises the following raw materials in percentage by mass: 50% of LF refining tailings, 25% of blast furnace slag, 10% of coke powder, 8% of unexpanded vermiculite and 7% of fluorite.
The LF external refining tailings are tailings left after cooling, crushing and magnetic separation of LF external refining steel slag, and the main minerals of the tailings comprise C3S、C2S、C12A7The silicate and aluminate belong to the category of calcium aluminate slag system, the main chemical components of the silicate and aluminate are that CaO content is more than 45 percent, and Al2O3The content is more than 15 percent, the content of Fe and C is little, and the powder is formed after cooling.
The blast furnace slag particles are melts which are mainly formed by combining gangue, fuel ash, added slag-forming agent and the like in iron ores during blast furnace smelting, and are formed by quenching treatment through a drawing method, so that water-quenched blast furnace slag particles are obtained, the appearance of the water-quenched blast furnace slag particles is light yellow, and the alkalinity coefficient is more than 1.
The coke powder is powder of metallurgical coke, the mass content of fixed carbon is more than 80%, and the mass content of ash is more than 10%.
The unexpanded vermiculite is a layered structure magnesium-containing aluminosilicate secondary metamorphic mineral, is mica-like in appearance, is a layered structure silicate, and can expand by more than 20 times when heated to a temperature of more than 300 ℃.
A preparation method of a low-carbon alkaline molten steel heat-preservation covering agent comprises the following steps:
1) weighing various raw materials according to the mass percentage of the raw materials, and adding the raw materials into a lubricating and grinding device;
2) and carrying out damp grinding on the mixture for 40 minutes by using damp grinding equipment to obtain the low-carbon alkaline molten steel heat-preservation covering agent.
The low-carbon alkaline molten steel heat-preservation covering agent obtained in the embodiment is a powdery substance with uniform quality, the proportion of powder particles with the particle size of less than 1mm is not less than 70% by mass, the proportion of powder particles with the particle size of 1-2 mm is less than 30% by mass, and the water content of the low-carbon alkaline molten steel heat-preservation covering agent is not more than 1% by mass.
Example 2:
as shown in figure 1, the low-carbon alkaline molten steel heat-preservation covering agent prepared by using LF refining tailings provided by the invention comprises the following raw materials in percentage by mass: 35% of LF refining tailings, 40% of blast furnace slag, 5% of coke powder, 15% of unexpanded vermiculite and 5% of fluorite.
The LF external refining tailings are tailings left after cooling, crushing and magnetic separation of LF external refining steel slag, and the main minerals of the tailings comprise C3S、C2S、C12A7The silicate and aluminate belong to the category of calcium aluminate slag system, the main chemical components of the silicate and aluminate are that CaO content is more than 45 percent, and Al2O3The content is more than 15 percent, the content of Fe and C is little, and the powder is formed after cooling.
The blast furnace slag particles are melts which are mainly formed by combining gangue, fuel ash, added slag-forming agent and the like in iron ores during blast furnace smelting, and are formed by quenching treatment through a drawing method, so that water-quenched blast furnace slag particles are obtained, the appearance of the water-quenched blast furnace slag particles is light yellow, and the alkalinity coefficient is more than 1.
The coke powder is powder of metallurgical coke, the mass content of fixed carbon is more than 80%, and the mass content of ash is more than 10%.
The unexpanded vermiculite is a layered structure magnesium-containing aluminosilicate secondary metamorphic mineral, is mica-like in appearance, is a layered structure silicate, and can expand by more than 20 times when heated to 300 ℃.
A preparation method of a low-carbon alkaline molten steel heat-preservation covering agent comprises the following steps:
1) weighing various raw materials according to the mass percentage of the raw materials, and adding the raw materials into a lubricating and grinding device;
2) and carrying out damp grinding on the mixture for 60 minutes by using damp grinding equipment to obtain the low-carbon alkaline molten steel heat-preservation covering agent.
The low-carbon alkaline molten steel heat-preservation covering agent obtained in the embodiment is a powdery substance with uniform quality, the proportion of powder particles with the particle size of less than 1mm is not less than 70% by mass, the proportion of powder particles with the particle size of 1-2 mm is less than 30% by mass, and the water content of the low-carbon alkaline molten steel heat-preservation covering agent is not more than 1% by mass.
Example 3:
as shown in figure 1, the molten steel heat-preservation covering agent prepared by using LF refining tailings provided by the invention comprises the following raw materials in percentage by mass: 40% of LF refining tailings, 30% of blast furnace slag, 8% of coke powder, 12% of unexpanded vermiculite and 10% of fluorite.
The LF external refining tailings are tailings left after cooling, crushing and magnetic separation of LF external refining steel slag, and the main minerals of the tailings comprise C3S、C2S、C12A7The silicate and aluminate belong to the category of calcium aluminate slag system, the main chemical components of the silicate and aluminate are that CaO content is more than 45 percent, and Al2O3The content is more than 15 percent, the content of Fe and C is little, and the powder is formed after cooling.
The blast furnace slag particles are melts which are mainly formed by combining gangue, fuel ash, added slag-forming agent and the like in iron ores during blast furnace smelting, and are formed by quenching treatment through a drawing method, so that water-quenched blast furnace slag particles are obtained, the appearance of the water-quenched blast furnace slag particles is light yellow, and the alkalinity coefficient is more than 1.
The coke powder is powder of metallurgical coke, the mass content of fixed carbon is more than 80%, and the mass content of ash is more than 10%.
The unexpanded vermiculite is a layered structure magnesium-containing aluminosilicate secondary metamorphic mineral, is mica-like in appearance, is a layered structure silicate, and can expand by more than 20 times when heated to 300 ℃.
A preparation method of a low-carbon alkaline molten steel heat-preservation covering agent comprises the following steps:
1) weighing various raw materials according to the mass percentage of the raw materials, and adding the raw materials into a lubricating and grinding device;
2) and carrying out damp grinding on the mixture for 50 minutes by using damp grinding equipment to obtain the low-carbon alkaline molten steel heat-preservation covering agent.
The low-carbon alkaline molten steel heat-preservation covering agent obtained in the embodiment is a powdery substance with uniform quality, the proportion of powder particles with the particle size of less than 1mm is not less than 70% by mass, the proportion of powder particles with the particle size of 1-2 mm is less than 30% by mass, and the water content of the low-carbon alkaline molten steel heat-preservation covering agent is not more than 1% by mass.
The method can be realized by upper and lower limit values and interval values of intervals of process parameters (such as temperature, time and the like), and embodiments are not listed.
The percentages not specified in the present invention are mass percentages. Conventional technical knowledge in the art can be used for the details which are not described in the present invention.
Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. Unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features. The description is only for the purpose of facilitating understanding of the present invention and should not be construed as specifically limiting the present invention.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. The low-carbon alkaline molten steel heat-preservation covering agent is characterized by comprising the following components in percentage by mass: 35-50% of LF refining tailings, 25-40% of blast furnace slag particles, 5-10% of coke powder, 8-15% of unexpanded vermiculite and 5-10% of fluorite;
the low-carbon alkaline molten steel heat-preservation covering agent is a uniform powdery substance, wherein the part with the particle size of less than 1mm accounts for not less than 70% by mass, the part with the particle size of 1-2 mm is not higher than 30% by mass, and the water content is not higher than 1% by mass;
the LF refining tailings are the tailings left after cooling, crushing and magnetic separation of LF external refining steel slag, and minerals contained in the tailings comprise tricalcium silicate, dicalcium silicate and calcium aluminate, and the LF refining tailings belong to a calcium aluminate slag system; the CaO content in the tailings is more than 45 percent by mass, and Al2O3The mass content is more than 15 percent;
the blast furnace slag particles are melts which are formed by combining gangue and fuel ash in iron ores during blast furnace smelting and added slag forming agents and mainly comprise calcium magnesium silicate and calcium magnesium aluminosilicate, and water quenching blast furnace slag particles are prepared after the water quenching treatment by a drawing method, and the alkalinity coefficient is larger than 1.
2. The low-carbon alkaline molten steel heat-preserving covering agent as claimed in claim 1, wherein the coke powder is powder of metallurgical coke, and has a fixed carbon content of more than 80% by mass and an ash content of more than 10% by mass.
3. The low-carbon alkaline molten steel heat-preserving covering agent as claimed in claim 1, wherein the unexpanded vermiculite is a silicate with a layered structure, and expands 20 times or more in volume when heated to 300 ℃.
4. The preparation method of the low-carbon alkaline molten steel heat-preservation covering agent of claim 1, comprising the following steps of:
weighing the components according to the mass percentage, mixing and then carrying out wet grinding to obtain the low-carbon alkaline molten steel heat-preservation covering agent.
5. The method of claim 4, wherein the duration of the attrition is from 40 to 60 minutes.
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| CN116586576B (en) * | 2023-07-14 | 2023-10-10 | 张家口汇德冶金材料有限公司 | Continuous casting large round billet low-carbon steel covering slag and preparation method thereof |
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