CN114737025A - RH top slag modifier and preparation method thereof - Google Patents

RH top slag modifier and preparation method thereof Download PDF

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Publication number
CN114737025A
CN114737025A CN202210249314.XA CN202210249314A CN114737025A CN 114737025 A CN114737025 A CN 114737025A CN 202210249314 A CN202210249314 A CN 202210249314A CN 114737025 A CN114737025 A CN 114737025A
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China
Prior art keywords
modifier
percent
slag
top slag
raw materials
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王庆社
余振西
刘显
张冰冰
韦伟
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Xixia Yaohui Metallurgical Material Co ltd
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Xixia Yaohui Metallurgical Material Co ltd
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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
    • C21C7/10—Handling in a vacuum
    • 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
    • C21C7/0006—Adding metallic additives
    • 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
    • C21C7/0025—Adding carbon material
    • 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
    • C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
    • 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
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/06—Deoxidising, e.g. killing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The invention belongs to the technical field of steel preparation, and particularly relates to an RH top slag modifier and a preparation method thereof. The RH top slag modifier contains the following components in percentage by mass: 10 to 45 percent; al (Al)2O3: 10 to 35 percent; 15-30% of CaO; MgO: 3 to 10 percent; does not contain CaF and CaCO3. Wherein Al and Al2O3The sum of the mass percentages is more than 40 percent and less than 70 percent. Al and Al2O3The mass ratio is 1: (0.4-0.7). The invention does not contain CaF and CaCO3The modifier adjusts the slag property of the slag in the steel ladle, effectively reduces the FeO content in the slag, has strong capability of absorbing molten steel inclusions, improves the purity of the molten steel, forms the characteristics of low-melting-point steel ladle top slag, increases the surface tension of the modified slag liquid, can quickly adhere to the inclusions in the molten steel, and has good slag turning effect so as to achieve the effect of removing slagAnd solves the comprehensive problem of removing the impurities. Meanwhile, the components and the ratio of the modifier are adjusted to perform relevant adjustment on the smoking condition of the modifier, so that the smoking condition of the modifier is solved.

Description

RH top slag modifier and preparation method thereof
Technical Field
The invention belongs to the technical field of steel preparation, and particularly relates to an RH top slag modifier and a preparation method thereof.
Background
Currently, the situation of the iron and steel industry in the world is extremely severe, and most iron and steel companies are in the situation of micro-profit or loss. In order to improve the product competitiveness and seek for survival and development under the situation of cold winter, on one hand, steel enterprises are required to develop markets to obtain profits, and on the other hand, the steel enterprises are required to internally improve the quality and reduce the cost.
When steel is prepared, high-oxidizing slag is brought in during the tapping process of the primary smelting furnace, the high-oxidizing slag can cause alloy loss in the alloying process, and meanwhile, the dissolution probability of refractory materials is increased, and serious secondary pollution is caused to molten steel; and the ladle top slag contains higher FeO, and the recovery of metal resources in the top slag can also increase the economic benefit. The use of the ladle top slag modifier can reduce the oxidability of the ladle top slag, improve the alkalinity of the slag and improve the impurity adsorption capability of the top slag, and is an important means for smelting pure steel. The conventional ladle top slag modification process is to modify the ladle top slag in the converter tapping process or in a converter argon blowing station, and the main process characteristics are as follows: and (4) not deoxidizing the converter steel tapping, adding lime into the ladle in the converter steel tapping process, and adding a modifier to the slag surface of the top slag of the ladle after the steel tapping is finished. The ladle top slag modification process has the following problems: firstly, the modifier is not easy to melt uniformly on the slag surface of the top slag of the steel ladle, and the smoke generated by the reaction of the modifier and the steel slag in the stirring process of blowing argon gas at the bottom of the steel ladle is large, so that the environment is polluted, and the human health and the environmental protection are not facilitated; secondly, in order to pursue lower steel slag oxidability, the addition amount of the modifier is larger, which is not beneficial to saving cost; thirdly, the calcium-aluminum ratio of the top slag is not easy to be stably controlled, and the modification effect of the top slag of the steel ladle is influenced.
Disclosure of Invention
The invention aims to provide an RH top slag modifier and a preparation method thereof, and aims to solve the problems of high FeO content, difficulty in slag turning and serious smoke generation in the conventional ladle top slag modification process. The invention selects the material which does not contain CaF and CaCO3The modifier adjusts the slag property of the slag in the steel ladle, effectively reduces the FeO content in the slag, has strong capability of absorbing molten steel inclusions, and improves the purity of the molten steelThe modified slag liquid has the characteristics of high surface tension, quick adhesion to inclusions in molten steel, good slag turning effect and capability of solving the comprehensive problem of removing the inclusions. Meanwhile, the components and the ratio of the modifier are adjusted to perform relevant adjustment on the smoking condition of the modifier, so that the smoking condition of the modifier is solved.
In one aspect, the invention provides an RH top slag modifier, which contains Al and Al2O3CaO, MgO, CaF and CaCO are not contained3。
The RH top slag modifier of the invention may contain SiO2C, P, S, Al is a reactive metal, and the aluminum has strong deoxidizing capacity and can quickly deoxidize, thereby being beneficial to quickly balancing the transmission of oxygen from molten steel to top slag. When Al is used as a modifier, Al is oxidized by oxygen in the air, and the utilization efficiency is low, resulting in high use cost. The deoxidation product of the Al-based ladle slag modifier is Al2O 3. Al can remove oxygen in the ladle top slag, and the oxidability of the top slag is reduced, so that secondary oxidation of molten steel brought by a post-process treatment process is reduced. The dosage of Al influences the reaction speed of the modifier, the smoke generation condition, the addition amount of the modifier, the top slag amount, the slag turning, the temperature drop of the molten steel and the like. One or more of (a). Other inevitable impurities may also be contained.
Wherein the content of the first and second substances,
Al 2O3the fluidity of the molten slag can be changed, the material proportion of the top slag of the steel ladle is controlled, and impurities are adsorbed; has great influence on the melting point of the modifier.
SiO may be present in the modifier2， SiO2Has partial slagging function, is easy to be reduced by Al, reduces the Al efficiency, can also influence the alkalinity of top slag, and can also influence other effective components.
Carbon can be added into the modifier, which can keep the reducing atmosphere of the slag, reduce the activity of FeO in the modified slag, and the carbon in the slag exists in the form of carbide, thereby stabilizing the reducing performance of the slag and reducing the loss and secondary oxidation of aluminum.
S and P in the modifier are impurity components brought by various raw materials, are harmful elements and have the content as low as possible.
Further, the mass percent of Al in the RH top slag modifier is 10 to 45%, preferably 15 to 43%, preferably 25 to 41%, more preferably 35 to 40%, and specific values of the mass percent of Al may be selected, for example, 45%, 44%, 43%, 42%, 41%, 40%, 38%, 36%, 34%, 32%, 30%, 25%, 20%, 15%, 10%, and the like.
Further, Al in the RH top slag modifier2O3The mass percent of (B) is 10-35%, preferably 15-30%, preferably 18-27%, more preferably 20-25%, and a specific value of Al can be selected2O3The mass percentage of (b) is, for example, 35%, 32%, 28%, 26%, 24%, 22%, 20%, 18%, 16%, 13%, 10%, etc.
Further, the mass percent of CaO in the RH top slag modifier is 15 to 30%, preferably 12 to 25%, preferably 15 to 23%, more preferably 18 to 22%, and specific values of the mass percent of CaO may be selected, for example, 30%, 28%, 26%, 24%, 22%, 20%, 19%, 18%, 17%, 16%, 15%, etc.
Further, the mass percent of MgO in the RH top slag modifier is 3 to 10%, preferably 4 to 9%, preferably 5 to 8%, more preferably 6 to 7%, and specific values of the mass percent of MgO may be selected, for example, 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, and the like.
Further, Al and Al in the RH top slag modifier2O3The sum of the mass percentages is more than 40 percent and less than 70 percent; preferably greater than 50%, less than 68%; more preferably greater than 55%, less than 65%; specific values of Al and Al can be selected2O3The sum of the mass percentages is, for example, 40%, 43%, 46%, 49%, 50%, 52%, 54%, 56%, 58%, 60%, 63%, 65%, 66%, 69%, 70%, etc.
Further, Al and Al in the RH top slag modifier2O3The mass ratio is 1: (0.4-0.7); preferably 1: (0.5-0.65); specific values of Al and Al can be selected2O3Mass ratio, for example, 1:0.4, 1:0.7, 1:0.5, 1:0.52, 1:0.53, 1:0.548, 1:0.55, 1:0.6, 1:0.65, 1:0.7, etc.
Further, the RH top slag modifier contains, by mass percent, Al: 10 to 45 percent;Al2O3: 10 to 35 percent; 15-30% of CaO; MgO: 3 to 10 percent; does not contain CaF and CaCO3. Wherein Al and Al2O3The sum of the mass percentages is more than 40 percent and less than 70 percent. Al and Al2O3The mass ratio is 1: (0.4-0.7).
Further, SiO2The content is less than or equal to 8wt percent. The content of C is less than or equal to 4wt percent. The content of P is less than or equal to 0.5wt percent. The content of S is less than or equal to 0.5 percent.
The applicant has found that the effect of the modifier is greatly influenced by the modifier particle size of the modifier system of the invention when studying the modifier system, and the applicant selects the modifier particle size in the range of 35mm to 50mm, preferably 37mm to 45mm, and can select the particle size in the range of any point value of 35mm, 36mm, 37mm, 38mm, 39mm, 40mm, 41mm, 42mm, 43mm, 44mm and 45mm after integrating the technical effects of the modifier.
The invention also provides a preparation method of the RH top slag modifier, which comprises the following steps:
step 1: preparing raw materials;
step 2: preparing raw materials;
and step 3: stirring the raw materials of the ingredients to obtain an ingredient mixture;
and 4, step 4: and (5) pressing the mixture of the ingredients into balls to obtain a finished product.
Further comprising the step 5: and packaging the finished product obtained by pressing the balls.
Further, the step 1 of preparing raw materials comprises selecting raw materials qualified in inspection, and conveying the raw materials to a storage bin through a conveying device for storage and marking for later use.
Further, the step 2 of material proportioning comprises automatic proportioning, the proportioning of the raw materials is input into a control room computing system, the quality of each raw material is calculated, and then the blanking system is automatically controlled and the raw materials are conveyed to a mixing device. Wherein, the mixing device is a closed mixing device with a stirrer. According to the production tonnage of every 1000kg, the error of the production quality of every crop is required to be less than or equal to 5.0 kg.
Further, in the process of stirring the raw materials of the ingredients in the step 3 to obtain the ingredient mixture, the stirring time is controlled to be 1-60 min, and the rotating speed of the stirrer is 30-1000 rpm. The stirring can be performed by a stirrer. Two or more than two stirrers can be adopted for stirring successively for continuous production.
Further, the step 4 of pressing the mixture to obtain a finished product comprises the steps of putting the uniformly stirred mixture into a storage container, conveying the mixture to a high-position bin of a ball press machine through a spiral feeding system, adjusting the rotating speed and pressure of a pair roller of the ball press machine, opening a feeding spiral below the high-position bin, pressing balls, and performing sampling inspection on the obtained finished product to ensure that the quality is qualified and meet the required standard.
Further, the step 5 of packaging the finished product obtained by pressing the ball comprises the step of directly conveying the finished product to a finished product bin through a conveying device at a feed opening of the ball pressing machine for packaging. According to the packaging requirements, the packaging error of each small bag is less than or equal to 0.5 kg/bag, and the packaging error of each ton is less than or equal to 2 kg/ton. And then storing the packaged finished product in a warehouse, and taking waterproof and moistureproof measures.
The beneficial technical effects are as follows: the invention does not contain CaF and CaCO3The modifier adjusts the slag property of the slag in the steel ladle, effectively reduces the FeO content in the slag, has strong capability of absorbing molten steel inclusions, improves the purity of the molten steel, and forms the top slag of the low-melting steel ladle, the surface tension of the modified slag liquid is increased, the modified slag liquid can be quickly adhered to the inclusions in the molten steel, has good slag turning effect, and solves the comprehensive problem of removing the inclusions. Meanwhile, the components and the ratio of the modifier are adjusted to perform relevant adjustment on the smoking condition of the modifier, so that the smoking condition of the modifier is solved.
The content of FeO in the top slag modified by the RH top slag modifier is greatly reduced, and the top slag modifier can control the content of FeO in the top slag to be below 6 percent, thereby having wide application prospect.
The invention selects Al2O3 of 1:0.4-0.7, so that the invention has better FeO content reduction and better smoking technical effect. The invention selects 40-70% of Al and Al2O3 total amount, so that the invention has better FeO content reduction, better slag turning effect and smoke scoring technical effect. The particle size of the modifier is 35-50mm, so that the modifier can be increased to reduce the FeO content in the top slag.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
Example 1:
an RH top slag modifier comprises the following raw materials in parts by weight: al: 42 parts of (A); al (Al)2O3: 23 parts; 22.4 parts of CaO; MgO: 4.2 parts of a mixture; SiO 2: 6.5 parts; c: 1.8 parts; p: 0.03 part; s: 0.07 part; does not contain CaF and CaCO3。
The preparation method comprises the following steps: (1) the raw materials are inspected to be qualified and are conveyed to a storage bin through a conveying device to be stored and marked for later use;
(2) inputting the ratio of each raw material into a calculation system of a control room, calculating the quality of each raw material, automatically controlling a blanking system and conveying the raw materials to a mixing device; wherein the mixing device is a closed mixing device with a stirrer; according to the production tonnage of every 1000kg, the error of the production quality of every crop is required to be less than or equal to 5.0 kg.
(3) In the process of stirring in the mixing device to obtain the ingredient mixture, the stirring time is controlled to be 20min, and the rotating speed of the stirrer is 50 revolutions per minute; the stirring adopts two stirrers to stir in sequence for continuous production;
(4) putting the uniformly stirred ingredient mixture into a storage container, conveying the ingredient mixture to a high-position bin of a ball press machine by a spiral feeding system, adjusting the rotating speed and pressure of a double roller of the ball press machine, opening a feeding spiral below the high-position bin, pressing balls, performing sampling inspection on the obtained finished product, ensuring that the quality is qualified, meeting the required standard, and sieving to select a product with the particle size range of 35-50 mm;
(5) and the step of packaging the finished product with the selected required particle size range comprises the step of directly conveying the finished product to a finished product bin by a conveying device at a feed opening of a ball press machine for packaging. And according to the packaging requirements, the packaging error of each small bag is less than or equal to 0.5 kg/bag, and the packaging error of each ton is less than or equal to 2 kg/ton. And then storing the packaged finished product in a warehouse, and taking waterproof and moistureproof measures.
Example 2:
an RH top slag modifier comprises the following raw materials (by weight portion): al: 45 parts of (1); al (Al)2O3: 25 parts of (1); 15.6 parts of CaO; MgO: 7.0 parts; SiO 2: 4.6 parts; c: 2.7 parts; p: 0.03 part; s: 0.07 part; does not contain CaF and CaCO3。
The preparation method comprises the following steps: (1) the raw materials are inspected to be qualified and are conveyed to a storage bin through a conveying device to be stored and marked for later use;
(2) inputting the ratio of each raw material into a calculation system of a control room, calculating the quality of each raw material, automatically controlling a blanking system and conveying the raw materials to a mixing device; wherein the mixing device is a closed mixing device with a stirrer; according to the production tonnage of every crop of 1000kg, the error of the production quality of every crop is required to be less than or equal to 5.0 kg.
(3) In the process of stirring in the mixing device to obtain the ingredient mixture, the stirring time is controlled to be 20min, and the rotating speed of the stirrer is 50 revolutions per minute; the stirring adopts two stirrers to stir in sequence for continuous production;
(4) putting the uniformly stirred ingredient mixture into a storage container, conveying the ingredient mixture to a high-position bin of a ball press machine by a spiral feeding system, adjusting the rotating speed and pressure of a double roller of the ball press machine, opening a feeding spiral below the high-position bin, pressing balls, performing sampling inspection on the obtained finished product, ensuring that the quality is qualified, meeting the required standard, and sieving and selecting a product with the particle size range of 35-50 mm;
(5) and the step of packaging the finished product with the selected required particle size range comprises the step of directly conveying the finished product to a finished product bin by a conveying device at a feed opening of a ball press machine for packaging. And according to the packaging requirements, the packaging error of each small bag is less than or equal to 0.5 kg/bag, and the packaging error of each ton is less than or equal to 2 kg/ton. And then storing the packaged finished product in a warehouse, and taking waterproof and moistureproof measures.
Example 3:
an RH top slag modifier comprises the following raw materials (by weight portion): al: 36 parts of (a); al (Al)2O3: 24.3 parts of a mixture; 30 parts of CaO; MgO: 6.5 parts; SiO 2: 2.1 parts; c: 1.0 part; p: 0.03 part; s: 0.07 part; does not contain CaF and CaCO3。
The preparation method comprises the following steps: (1) the raw materials are inspected to be qualified and are conveyed to a storage bin through a conveying device to be stored and marked for later use;
(2) inputting the ratio of each raw material into a calculation system of a control room, calculating the quality of each raw material, automatically controlling a blanking system and conveying the raw materials to a mixing device; wherein the mixing device is a closed mixing device with a stirrer; according to the production tonnage of every 1000kg, the error of the production quality of every crop is required to be less than or equal to 5.0 kg.
(3) In the process of stirring in the mixing device to obtain the ingredient mixture, the stirring time is controlled to be 20min, and the rotating speed of the stirrer is 50 revolutions per minute; the stirring adopts two stirrers to stir in sequence for continuous production;
(4) putting the uniformly stirred ingredient mixture into a storage container, conveying the ingredient mixture to a high-position bin of a ball press machine by a spiral feeding system, adjusting the rotating speed and pressure of a double roller of the ball press machine, opening a feeding spiral below the high-position bin, pressing balls, performing sampling inspection on the obtained finished product, ensuring that the quality is qualified, meeting the required standard, and sieving and selecting a product with the particle size range of 35-50 mm;
(5) and the step of packaging the finished product with the selected required particle size range comprises the step of directly conveying the finished product to a finished product bin by a conveying device at a feed opening of a ball press machine for packaging. And according to the packaging requirements, the packaging error of each small bag is less than or equal to 0.5 kg/bag, and the packaging error of each ton is less than or equal to 2 kg/ton. And then storing the packaged finished product in a warehouse, and taking waterproof and moistureproof measures.
Example 4:
an RH top slag modifier comprises the following raw materials in parts by weight: al: 43 parts of a mixture; al (aluminum)2O3: 23.6 parts; 20 parts of CaO; MgO: 5.1 parts; SiO 2: 5.2 parts of; c: 3.0 parts of (B); p: 0.03 part; s: 0.07 part; does not contain CaF and CaCO3。
The preparation method comprises the following steps: (1) the raw materials are inspected to be qualified and are conveyed to a storage bin through a conveying device to be stored and marked for later use;
(2) inputting the ratio of each raw material into a calculation system of a control room, calculating the quality of each raw material, automatically controlling a blanking system and conveying the raw materials to a mixing device; wherein the mixing device is a closed mixing device with a stirrer; according to the production tonnage of every 1000kg, the error of the production quality of every crop is required to be less than or equal to 5.0 kg.
(3) In the process of stirring in the mixing device to obtain the ingredient mixture, the stirring time is controlled to be 20min, and the rotating speed of the stirrer is 50 revolutions per minute; the stirring adopts two stirrers to stir in sequence for continuous production;
(4) putting the uniformly stirred ingredient mixture into a storage container, conveying the ingredient mixture to a high-position bin of a ball press machine by a spiral feeding system, adjusting the rotating speed and pressure of a double roller of the ball press machine, opening a feeding spiral below the high-position bin, pressing balls, performing sampling inspection on the obtained finished product, ensuring that the quality is qualified, meeting the required standard, and sieving and selecting a product with the particle size range of 35-50 mm;
(5) and the step of packaging the finished product with the selected required particle size range comprises the step of directly conveying the finished product to a finished product bin by a conveying device at a feed opening of a ball press machine for packaging. And according to the packaging requirements, the packaging error of each small bag is less than or equal to 0.5 kg/bag, and the packaging error of each ton is less than or equal to 2 kg/ton. And then storing the packaged finished product in a warehouse, and taking waterproof and moistureproof measures.
First, embodiment performance test: after the converter smelting is finished, slag stopping and tapping are carried out, and after the tapping amount is finished, a top slag modifier is added into a steel ladle according to the amount of 2.0kg of molten steel per ton. And taking ladle top slag for detection before refining. The modifier used was the modifier described in examples 1-4 of the present invention.
And (3) modifying the detection result of the slag sample, wherein the detection result takes the mass percentage content of the materials as a unit:
principal Components TFe FeO Al2o3 SiO2 CaO MnO
Example 1 3.41 4.36 29.4 4.30 34.10 2.27
Example 2 4.52 5.38 29.8 3.79 45.62 3.7
Example 3 5.02 5.78 29.48 3.4 37.85 3.25
Example 4 5.55 5.9 23.12 7.2 44.2 2.32
The content of FeO in the top slag modified by the RH top slag modifier of the embodiments 1-4 is greatly reduced, and the top slag modifier obtained by the invention can control the content of FeO in the top slag to be below 6 percent, thereby having wide application prospect.
Di, Al and Al2O3Influence of dose ratio
The following is about Al and Al in the system of the invention2O3Study on the influence of the dosage ratio on the top slag after modification. Specifically, the applicant controlled Al and Al based on example 12O3The total amount is 65 parts and other conditions are unchanged, only Al and Al are changed2O3The ratio of the amounts was compared to the test of the modified top slag. See in particular the table below, in which test a4 is inventive example 1.
Smoke score when modifying with modifier addition: 1 minute: adding a slag modifier into the steel tapping to emit dense smoke, wherein the duration is more than 4 min; and 2, dividing: adding a slag modifier into the steel tapping to emit dense smoke, wherein the duration is more than 3min and less than 4 min; and 3, dividing: adding a slag modifier into the steel tapping to emit dense smoke, wherein the duration is more than 2min and less than 3 min; and 4, dividing: adding a slag modifier into the steel tapping to emit dense smoke, wherein the duration is more than 1.5min and less than 2 min; and 5, dividing: adding slag modifier into the steel, and discharging dense smoke for less than 1.5min
Test of Test a1 Test a2 Test a3 Test a4
Al:Al2O3 1:0.9 1:0.1 1:0.3 1:0.548
FeO content 6.59 4.05 3.83 4.36
Smoking scoring 5 1 2 4
According to the table analysis, the technical effects of reducing FeO content and having better smoking score are achieved by using the proper Al to Al2O3 in the range of 1:0.4-0.7, and the Al2O3 in the ratio of 1:0.4-0.7 is selected, so that the invention has better FeO content reduction and better smoking technical effect. The applicant speculates through a large number of experimental processes that although the Al content is increased when the Al2O3 is higher than the Al content, the sharp reaction of adding a large amount of Al into the molten steel top slag easily generates a large amount of smoke, so that the smoke scoring effect is poor. When Al2O3 with lower Al content is used, the Al content is reduced, which is not beneficial to reducing the FeO content of the top slag.
Third, influence of the total amount of Al and Al2O3
In order to further investigate the effect of the total amount of Al and Al2O3 on the modifier of the invention, the applicant conducted the following studies. Wherein, the applicant controls Al and Al on the basis of example 12O3The ratio was 1:0.548 and other conditions were unchanged, with only Al and Al being changed2O3The total dosage is compared with the test of the top slag after modification. See in particular the table below, in which test b4 is inventive example 1.
Grading the turned slag after adding the modifier: and 4, dividing: the method is easy; and 3, dividing: generally; and 2, dividing: difficulty; score 1 is difficult.
Test of Test b1 Test b2 Test b3 Test b4
Total amount of Al and Al2O3 20 80 90 65
FeO content% 9.35 4.07 4.12 4.36
Slag turnover scoring 4 2 1 3
Smoking scoring 5 2 1 4
The analysis of the contents in the table shows that the proper total amount of Al and Al2O3 is 40-70%, so that the technical effects of reducing the content of FeO, better slag turning effect and smoke score are achieved, and the technical effects of reducing the content of FeO, better slag turning effect and smoke score are achieved by selecting 40-70% of Al and the total amount of Al2O 3.
Fourth, influence of particle size of modifier
In order to further investigate the influence of the particle size of the modifier on the modifier of the present invention, the applicants conducted the following studies. The applicant compared the FeO content test in the upgraded top slag by changing only the sieving particle size condition while keeping the other conditions unchanged based on example 1. See in particular the table below, in which test c3 is inventive example 1.
Test of Test c1 Test c2 Test c3 Test c4
The particle diameter of the modifier is mm 10-30 60-90 35-50 37-45
FeO content% 5.58 5.24 4.36 4.25
Analysis of the contents in the table shows that the modifier has better effect of reducing the FeO content in the top slag in the particle size range of 35-50 mm. When the particle size of the modifier system is more than 50mm or less than 35mm, the effect of the modifier system on reducing the FeO content in the top slag is influenced to a greater or lesser extent. The applicant speculates that the effect may be reduced because the melting time is too long due to the non-uniform release of particles in the molten steel, and the modification effect may be deteriorated because the feeding speed of the modifier with a larger particle size is increased; too large a particle size will result in too fast a release rate of active ingredients from the modifier, and a non-uniform modifying effect of the modifier, resulting in a reduced FeO content.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. An RH top slag modifier is characterized in that: according to the mass percentage, the material contains Al: 10 to 45 percent; al (Al)2O3: 10 to 35 percent; 15-30% of CaO; MgO: 3 to 10 percent; free of CaF and CaCO3(ii) a Wherein Al and Al2O3The sum of the mass percentages is more than 40 percent and less than 70 percent; al and Al2O3The mass ratio is 1: (0.4-0.7).
2. An RH top slag modifier according to claim 1, wherein: the mass percent of Al in the modifier is 15-43%, preferably 25-41%, more preferably 35-40%.
3. An RH top slag modifier according to claim 1, wherein: al in the modifier2O3The mass percentage of (B) is 15-30%, preferably 18-27%, more preferably 20-25%.
4. As in claimSolving 1 the RH top slag modifier, which is characterized in that: al and Al in the modifier2O3The sum of the mass percentages is more than 50 percent and less than 68 percent; preferably greater than 55% and less than 65%.
5. An RH top slag modifier according to claim 1, wherein: al and Al in the modifier2O3The mass ratio is 1: (0.5-0.65).
6. An RH top slag modifier according to claim 1, wherein: the particle size of the modifier is in the range of 35mm-50mm, preferably 37-45 mm.
7. A process for the preparation of the RH topping modifier of any one of claims 1 to 6 wherein: the method comprises the following steps: step 1: preparing raw materials; and 2, step: preparing raw materials; and step 3: stirring the raw materials of the ingredients to obtain an ingredient mixture; and 4, step 4: pressing the mixture into balls to obtain a finished product; and/or step 5: and packaging the finished product obtained by pressing the balls.
8. The method of claim 7, wherein the step 2 of compounding the raw materials comprises automatically compounding, inputting the raw material ratios into a control room computing system, calculating the mass of each raw material, and automatically controlling a blanking system and delivering the raw materials to a mixing device.
9. A method for preparing RH top slag modifier according to claim 7, wherein in the step 3, when the raw materials of the ingredients are stirred, the stirring can be performed by one stirrer, or two or more stirrers are sequentially stirred for continuous production.
10. The method for preparing the RH top slag modifier of claim 7, wherein the step 1 raw material preparation comprises selecting qualified raw materials, and conveying the raw materials to a storage bin through a conveying device for storage and marking for later use;
the step 2 of material proportioning comprises automatic material proportioning, the proportion of each raw material is input into a control room computing system, the quality of each raw material is calculated, then a blanking system is automatically controlled, and the raw materials are conveyed to a mixing device; the error of the production quality of each crop is required to be less than or equal to 5.0kg according to the production tonnage of each crop of 1000 kg;
in the process of stirring the raw materials of the ingredients in the step 3 to obtain the ingredient mixture, the stirring time is controlled to be 1-60 min, and the rotating speed of the stirrer is 30-1000 rpm; the stirring can be carried out by adopting one stirrer, and two or more than two stirrers can be adopted for stirring in sequence for continuous production;
the step 4 of pressing the mixture to obtain a finished product comprises the steps of putting the uniformly stirred mixture into a storage container, conveying the mixture to a high-position bin of a ball press machine by a spiral feeding system, adjusting the rotating speed and pressure of a double roller of the ball press machine, opening a feeding spiral below the high-position bin, pressing balls, and performing sampling inspection on the obtained finished product to ensure that the quality is qualified and meets the required standard;
the step 5 of packaging the finished product obtained by pressing the ball comprises the step of directly conveying the finished product to a finished product bin through a conveying device at a feed opening of a ball pressing machine, and packaging; according to the packaging requirements, the packaging error of each small bag is less than or equal to 0.5 kg/bag, and the packaging error per ton is less than or equal to 2 kg/ton; and then storing the packaged finished product in a warehouse, and taking waterproof and moistureproof measures.
CN202210249314.XA 2022-03-15 2022-03-15 RH top slag modifier and preparation method thereof Pending CN114737025A (en)

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