CN116445685A - KR desulfurizing agent product and preparation method thereof - Google Patents
KR desulfurizing agent product and preparation method thereof Download PDFInfo
- Publication number
- CN116445685A CN116445685A CN202310263477.8A CN202310263477A CN116445685A CN 116445685 A CN116445685 A CN 116445685A CN 202310263477 A CN202310263477 A CN 202310263477A CN 116445685 A CN116445685 A CN 116445685A
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- China
- Prior art keywords
- materials
- strip
- shaped
- desulfurizing
- product
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Links
- 230000003009 desulfurizing effect Effects 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 title description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 54
- 239000000463 material Substances 0.000 claims abstract description 31
- 229910052742 iron Inorganic materials 0.000 claims abstract description 27
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 24
- 238000003756 stirring Methods 0.000 claims abstract description 23
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 18
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 18
- 239000004571 lime Substances 0.000 claims abstract description 18
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 17
- 239000011575 calcium Substances 0.000 claims abstract description 17
- 229910052751 metal Inorganic materials 0.000 claims abstract description 17
- 239000002184 metal Substances 0.000 claims abstract description 17
- 239000002893 slag Substances 0.000 claims abstract description 15
- 238000003825 pressing Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000005096 rolling process Methods 0.000 claims abstract description 6
- 238000012216 screening Methods 0.000 claims abstract description 6
- 238000007670 refining Methods 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 239000002994 raw material Substances 0.000 claims description 9
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 2
- 230000036632 reaction speed Effects 0.000 abstract description 7
- 238000009628 steelmaking Methods 0.000 abstract description 3
- 239000000047 product Substances 0.000 description 25
- 229910052717 sulfur Inorganic materials 0.000 description 9
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical group [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 8
- 239000011593 sulfur Substances 0.000 description 7
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 4
- 238000006477 desulfuration reaction Methods 0.000 description 4
- 230000023556 desulfurization Effects 0.000 description 4
- 239000010436 fluorite Substances 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
-
- 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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
- C21C1/025—Agents used for dephosphorising or desulfurising
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to the field of steelmaking, in particular to a KR desulfurizing agent product and a preparation method thereof, comprising the following steps: step one: stirring and mixing 10-20% of metal calcium slag and 80-90% of lime uniformly, and adding the mixed materials into a feed hopper; pressing the materials into a sheet rolling unit through a forced feeder, pressing the materials into strip-shaped or cylindrical lump materials through a groove between a roller and a roll in a hydraulic system, guiding the strip-shaped or cylindrical lump materials into a crusher to be crushed, crushing the strip-shaped or cylindrical lump materials through a pressing strip of a granulating device, and screening the crushed strip-shaped or cylindrical lump materials through a screening system to obtain finished products; step two: adding the finished product into a stirring molten iron pretreatment furnace, desulfurizing molten iron, wherein the rotation speed of a stirring head is 90-120 r/min, the refining time is 8-15min, the temperature is 1240-1350 ℃, and the product does not need premelting. The method of the invention is used for desulfurizing molten iron, and has the advantages of high desulfurizing reaction speed and high desulfurizing efficiency.
Description
Technical Field
The invention relates to the field of steelmaking, in particular to a KR desulfurizing agent product and a preparation method thereof.
Background
The traditional KR desulfurizing agent consists of lime and fluorite, and F is in serious corrosion resistance of fluorite to a hot-metal ladle - The ions easily loosen human bones after entering water, and in recent years, the fluorite price is gradually increased to cause continuous increase of steelmaking cost. The product has the advantages of no erosion to the hot metal ladle, stable components and certain fluxing and strippingThe fluorite substitute with sulfur function is produced. The desulfurization efficiency of the novel KR desulfurizing agent product is improved to a certain extent compared with that of the traditional KR desulfurizing agent.
The invention aims to provide a novel desulfurization product for molten iron pretreatment and a preparation method thereof, and the product has high desulfurization efficiency, can not cause serious corrosion to a molten iron tank and a stirring head, can prolong the service life of the stirring head and reduce the comprehensive production cost.
Disclosure of Invention
The invention aims at solving the problems and provides a KR desulfurizing agent product and a preparation method thereof.
The purpose of the invention is realized in the following way: a KR desulfurizing agent product comprises the following raw materials in percentage by weight: 10-20% of metal calcium slag and 80-90% of lime; the physicochemical indexes of the KR desulfurizing agent product are CaO:80% -86%, al 2 O 3 ：4%-10%，SiO 2 Less than or equal to 2.0 percent, S less than or equal to 0.015 percent; the particle size of the KR desulfurizer product is 0.5-1.2mm.
A method for preparing a KR desulfurizing agent product, comprising the steps of: step one: stirring and mixing 10-20% of metal calcium slag and 80-90% of lime uniformly, and adding the mixed materials into a feed hopper; pressing the materials into a sheet rolling unit through a forced feeder, pressing the materials into strip-shaped or cylindrical lump materials through a groove between a roller and a roll in a hydraulic system, guiding the strip-shaped or cylindrical lump materials into a crusher to be crushed, crushing the strip-shaped or cylindrical lump materials through a pressing strip of a granulating device, and screening the crushed strip-shaped or cylindrical lump materials through a screening system to obtain finished products; step two: adding the finished product into a stirring molten iron pretreatment furnace, desulfurizing molten iron, wherein the rotation speed of a stirring head is 90-120 r/min, the refining time is 8-15min, the temperature is 1240-1350 ℃, and the product does not need premelting.
The granularity of the raw material calcium slag and lime is less than 5mm, the CaO content of lime is 90-92%, and the activity is 350-400ml.
The beneficial effects of the invention are as follows: the method for desulfurizing molten iron has the advantages of high desulfurizing reaction speed, high desulfurizing efficiency, more than one time of the reaction speed, 15 percent of desulfurizing rate improvement and relatively lower desulfurizing cost compared with the traditional KR desulfurizing agent. The invention can reduce the impurity sulfur from 50ppm to 5ppm by one-time refining, and the sulfur removal efficiency reaches more than 90%.
Drawings
The invention is further described below with reference to the accompanying drawings.
Fig. 1 is a flow chart of the production process of the present invention.
Description of the embodiments
The chemical composition of the novel KR desulfurizing agent of the invention comprises metal calcium slag besides ordinary lime, the metal calcium slag is a residue left after high-purity lime and high-purity metal aluminum powder are extruded and pelletized and then calcined and reduced to metal calcium under the protection of inert gas, and the main components are CaO and Al 2 O 3 Calcium aluminate material, siO 2 The calcium aluminate which is a byproduct of the preparation of the metal calcium has lower melting point, high-temperature fluidity, self functions of desulfurization, dephosphorization, degassing and the like, and has no corrosion to refractory materials, and the novel KR desulfurizing agent is added into molten iron in a stirring method, so that the particle size of the desulfurizing agent is correspondingly required. The method for desulfurizing molten iron has the advantages of high desulfurizing reaction speed, high desulfurizing efficiency, more than one time of reaction speed, 15 percent improvement of desulfurizing rate and relatively lower desulfurizing cost compared with the traditional KR desulfurizing agent. In addition, the temperature drop of the molten iron is small.
The technical scheme is as follows: the novel KR desulfurizing agent comprises the following raw materials in percentage by weight: 10-20% of metal calcium slag and 80-90% of lime; the granularity of the raw material calcium slag and lime is less than 5mm. The proportion of the granularity of the novel KR desulfurizer finished product of 0.5-1.2mm is more than or equal to 80 percent, and the proportion of the granularity of less than or equal to 0.5mm and the granularity of more than or equal to 1.2mm are both less than 5 percent. The physicochemical index of the novel KR desulfurizing agent product is CaO 80% -86%, al 2 O 3 4%-10%，SiO 2 ≤2.0%，S≤0.015%。
The required raw materials comprise 10-20% of calcium metal slag and 80-90% of lime, the required raw materials are crushed and ground to be less than 5mm, the required raw materials are uniformly mixed and stirred according to a certain proportion, and the mixture is crushed into a finished product with the thickness of 0.5-1.2mm through a granulation device layering. The novel KR desulfurizing agent is added into a stirring type molten iron treatment furnace to desulfurize molten iron, the rotating speed of a stirring head is 90-120 r/min, the treatment time is 8-15min, the temperature is 1240-1350 ℃, and the product does not need premelting. The product has high desulfurizing reaction speed and desulfurizing efficiency, and compared with the traditional KR desulfurizing agent, the reaction speed is doubled by more than one time, the desulfurizing rate can be improved by 15 percent, and the desulfurizing cost is relatively low. The invention can reduce the impurity sulfur from 50ppm to 5ppm by one-time treatment, and the sulfur removal efficiency reaches more than 90%.
Example 1
10% of calcium metal slag and 90% of lime are fed into a mixer through a metering belt according to a proportion, and the mixed materials are added into a feed hopper; the material is pressed into a sheet rolling unit through a forced feeder and is pressed into strip-shaped or cylindrical lump materials through a groove between the rollers in a hydraulic system. And then the strip-shaped or cylindrical blocks are guided into a crusher to be crushed and sieved into 0.5-1.2mm finished products.
The finished product is added into a stirring type molten iron pretreatment furnace according to the addition amount of 0.5kg/t iron/0.001 percent S, the molten iron is desulfurized, the rotation speed of a stirring head is 115 revolutions per minute, the stirring time is 15 minutes, the temperature is 1300 ℃, and the sulfur content of the molten iron is reduced from 47ppm to 3.5ppm.
Example 2
15% of calcium metal slag and 85% of lime are fed into a mixer through a metering belt according to a proportion, and the mixed materials are added into a feed hopper; the material is pressed into a sheet rolling unit through a forced feeder and is pressed into strip-shaped or cylindrical lump materials through a groove between the rollers in a hydraulic system. And then the strip-shaped or cylindrical blocks are guided into a crusher to be crushed and sieved into 0.5-1.2mm finished products.
The finished product is added into a stirring type molten iron pretreatment furnace according to the addition amount of 0.5kg/t iron/0.001 percent S, the molten iron is desulfurized, the rotation speed of a stirring head is 115 revolutions per minute, the stirring time is 15 minutes, the temperature is 1300 ℃, and the sulfur content of the molten iron is reduced from 38ppm to 2ppm.
Example 3
Feeding 20% of metal calcium slag and 80% of lime into a mixer through a metering belt according to a proportion, and adding the mixed materials into a feed hopper; the material is pressed into a sheet rolling unit through a forced feeder and is pressed into strip-shaped or cylindrical lump materials through a groove between the rollers in a hydraulic system. And then the strip-shaped or cylindrical blocks are guided into a crusher to be crushed and sieved into 0.5-1.2mm finished products.
Adding the finished product into a stirring type molten iron pretreatment furnace according to the adding amount of 0.5kg/t iron/0.001% S, desulfurizing the molten iron, stirring for 15min at the rotating speed of a stirring head of 115 revolutions per minute, and reducing the sulfur content of the molten iron from 17ppm to 1ppm at the temperature of 1300 ℃.
The above embodiments are merely examples of the present invention, but the present invention is not limited to the above embodiments, and any changes or modifications within the scope of the present invention are intended to be included in the scope of the present invention.
Claims (3)
1. A KR desulfurizing agent product, characterized in that: the KR desulfurizing agent comprises the following raw materials in percentage by weight: 10-20% of metal calcium slag and 80-90% of lime; the physicochemical indexes of the KR desulfurizing agent product are CaO:80% -86%, al 2 O 3 ：4%-10%，SiO 2 Less than or equal to 2.0 percent, S less than or equal to 0.015 percent; the particle size of the KR desulfurizer product is 0.5-1.2mm.
2. A preparation method of a KR desulfurizing agent product is characterized by comprising the following steps: the method comprises the following steps:
step one: stirring and mixing 10-20% of metal calcium slag and 80-90% of lime uniformly, and adding the mixed materials into a feed hopper; pressing the materials into a sheet rolling unit through a forced feeder, pressing the materials into strip-shaped or cylindrical lump materials through a groove between a roller and a roll in a hydraulic system, guiding the strip-shaped or cylindrical lump materials into a crusher to be crushed, crushing the strip-shaped or cylindrical lump materials through a pressing strip of a granulating device, and screening the crushed strip-shaped or cylindrical lump materials through a screening system to obtain finished products;
step two: adding the finished product into a stirring molten iron pretreatment furnace, desulfurizing molten iron, wherein the rotation speed of a stirring head is 90-120 r/min, the refining time is 8-15min, the temperature is 1240-1350 ℃, and the product does not need premelting.
3. The method for preparing the KR desulfurizing agent product according to claim 2, which is characterized in that: the granularity of the raw material calcium slag and lime is less than 5mm, the CaO content of lime is 90-92%, and the activity is 350-400ml.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310263477.8A CN116445685A (en) | 2023-03-17 | 2023-03-17 | KR desulfurizing agent product and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310263477.8A CN116445685A (en) | 2023-03-17 | 2023-03-17 | KR desulfurizing agent product and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116445685A true CN116445685A (en) | 2023-07-18 |
Family
ID=87119261
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310263477.8A Pending CN116445685A (en) | 2023-03-17 | 2023-03-17 | KR desulfurizing agent product and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116445685A (en) |
-
2023
- 2023-03-17 CN CN202310263477.8A patent/CN116445685A/en active Pending
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