CN117344077A - High-efficiency composite functional desulfurizing agent for molten iron pretreatment and preparation method thereof - Google Patents
High-efficiency composite functional desulfurizing agent for molten iron pretreatment and preparation method thereof Download PDFInfo
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- CN117344077A CN117344077A CN202310705424.7A CN202310705424A CN117344077A CN 117344077 A CN117344077 A CN 117344077A CN 202310705424 A CN202310705424 A CN 202310705424A CN 117344077 A CN117344077 A CN 117344077A
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- desulfurizing agent
- molten iron
- mixture
- composite functional
- aluminum
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 48
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 33
- 230000003009 desulfurizing effect Effects 0.000 title claims abstract description 28
- 239000002131 composite material Substances 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 238000002203 pretreatment Methods 0.000 title description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 26
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 25
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 23
- 230000023556 desulfurization Effects 0.000 claims abstract description 23
- 239000011593 sulfur Substances 0.000 claims abstract description 23
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims abstract description 20
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910021532 Calcite Inorganic materials 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 13
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 12
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 12
- 239000011230 binding agent Substances 0.000 claims abstract description 12
- 239000004571 lime Substances 0.000 claims abstract description 12
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims abstract description 10
- 235000017557 sodium bicarbonate Nutrition 0.000 claims abstract description 10
- 239000006227 byproduct Substances 0.000 claims abstract description 9
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 9
- 238000003723 Smelting Methods 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims description 36
- 238000003756 stirring Methods 0.000 claims description 11
- 238000000605 extraction Methods 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 7
- 238000005303 weighing Methods 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 5
- 235000020985 whole grains Nutrition 0.000 claims description 5
- PNXOJQQRXBVKEX-UHFFFAOYSA-N iron vanadium Chemical compound [V].[Fe] PNXOJQQRXBVKEX-UHFFFAOYSA-N 0.000 claims description 4
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical group [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 3
- 239000005011 phenolic resin Substances 0.000 claims description 3
- 229920001568 phenolic resin Polymers 0.000 claims description 3
- 238000007670 refining Methods 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 2
- 238000012216 screening Methods 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 15
- 230000008569 process Effects 0.000 abstract description 12
- 238000005260 corrosion Methods 0.000 abstract description 6
- 230000007797 corrosion Effects 0.000 abstract description 6
- 230000033764 rhythmic process Effects 0.000 abstract description 6
- 239000000047 product Substances 0.000 abstract description 5
- 238000009628 steelmaking Methods 0.000 abstract description 5
- 239000011819 refractory material Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000002893 slag Substances 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 229910052720 vanadium Inorganic materials 0.000 description 5
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
- 239000010436 fluorite Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- GFNGCDBZVSLSFT-UHFFFAOYSA-N titanium vanadium Chemical compound [Ti].[V] GFNGCDBZVSLSFT-UHFFFAOYSA-N 0.000 description 2
- 241001536352 Fraxinus americana Species 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000013020 final formulation Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 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
- 238000000465 moulding Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 238000010792 warming Methods 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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
- C21C1/025—Agents used for dephosphorising or desulfurising
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)
Abstract
The invention relates to a steelmaking desulfurizing agent, in particular to a high-efficiency composite functional desulfurizing agent for molten iron pretreatment and a preparation method thereof, wherein the composite functional desulfurizing agent comprises the following components: 60-80% of ultralow-carbon low-sulfur lime, 15-25% of aluminum ash serving as a byproduct of aluminum smelting industry, 10-20% of calcite, 1-5% of baking soda, 0.3-0.5% of binder and 1-6mm of product granularity, and is used for pretreatment of molten iron KR in steelmaking. Compared with a common KR desulfurizing agent, the end point sulfur of pretreatment desulfurization is reduced to below 0.002 percent from 0.010 percent, the unit consumption is less than 0.26 kg/(ton iron multiplied by sulfur), and the temperature in the pretreatment process is reduced to below 35 ℃ from 45-55 ℃; and meanwhile, an environment-friendly fluxing agent is used, so that corrosion of refractory materials is reduced, overhaul amount is reduced, and production rhythm is improved.
Description
Technical Field
The invention relates to a steelmaking desulfurizing agent, in particular to a high-efficiency composite functional desulfurizing agent for molten iron pretreatment and a preparation method thereof.
Background
Sulfur is one of the harmful elements in steel, and its main hazard is: resulting in hot embrittlement of the steel and anisotropy of the rolled steel, the sulfur content in the steel must be severely limited.
The pretreatment desulfurization of molten iron mainly refers to desulfurization treatment of molten iron before the molten iron enters a converter in steelmaking production. The cost of molten iron desulfurization is low, such as one kilogram of sulfur is removed in a blast furnace, a converter and an external refining device, and is 2.6 times, 16.9 times and 6.1 times of that of molten iron desulfurization respectively.
And (3) converting a certain steel mill to smelt vanadium-titanium magnetite, wherein the temperature of the blast furnace vanadium-titanium molten iron is lower than that of common ore molten iron, and the sulfur content is higher. On the premise of not greatly changing the steelmaking rhythm, in order to realize the vanadium extraction of the full quantity of molten iron, all molten iron is required to be deeply desulfurized, so that precious vanadium extraction time can be strived for a converter, and huge desulfurization pressure is brought to the molten iron pretreatment process. Meanwhile, the customers require to use fluorine-free or fluorine-less materials, so that corrosion to refractory materials is reduced (overhaul amount is reduced), and further, the vanadium extraction efficiency of the full molten iron is improved.
The product developed by the invention meets the requirements of three low and one high, realizes deep desulfurization of molten iron, strives for precious vanadium extraction time for a converter, and improves the vanadium extraction efficiency of full molten iron. Has the following advantages: low consumption: low unit consumption and low temperature drop. Low pollution: and the flux is fluorine-free or fluorine-less, so that corrosion to the refractory is reduced. Low cost: the cost of desulfurization cannot be increased much more than existing/common. High efficiency: the desulfurization effect is as high as possible, and the production rhythm is improved.
Disclosure of Invention
The invention aims at providing a high-efficiency composite functional desulfurizing agent for molten iron pretreatment and a preparation method thereof.
The purpose of the invention is realized in the following way: a high-efficiency composite functional desulfurizing agent for molten iron pretreatment comprises: 60-80% of ultra-low carbon low sulfur lime, 15-25% of aluminum ash which is an industrial byproduct of aluminum smelting, 10-20% of calcite, 1-5% of baking soda and 0.3-0.5% of binder.
The preparation method of the composite functional desulfurizing agent for high-efficiency molten iron pretreatment comprises the following steps: step one: crushing and crushing ultralow-carbon low-sulfur lime and white aluminum ash serving as an industrial byproduct of aluminum smelting, uniformly mixing the crushed and crushed white aluminum ash according to the ratio of 4:1, spraying 0.3-0.5% of binder, uniformly mixing the mixture again, rolling the mixture into strips through a high-pressure roller press, naturally dropping the strips into a whole grain crusher to crush the strips, screening out a mixture A with the qualified granularity of 1-6mm, and forming unqualified powder through external circulation into the roller press again; step two: the calcite is crushed and sieved to obtain qualified granularity of 1-6mm, and then is uniformly mixed with baking soda according to the proportion of 4:1 to form a mixture B; step three: and respectively weighing the mixture A and the mixture B by weighing, mixing according to the proportion of 5:1 to form a composite functional desulfurizing agent, adding the composite functional desulfurizing agent into a hot metal ladle, stirring the composite functional desulfurizing agent by a KR stirring head, and performing deep desulfurization pretreatment before full-scale molten iron vanadium extraction.
The ultra-low carbon low sulfur lime is as follows: c is less than 0.2%, S is less than 0.02%, caO is more than or equal to 90%, aluminum refining industry byproduct white aluminum ash is 20-40% of metallic aluminum, aluminum oxide is 50-70%, and calcite is CaCO 3 More than or equal to 95 percent, and the binder is phenolic resin.
The beneficial effects of the invention are as follows: 1. the product meets the requirement point of a client: the desulfurization effect is as high as possible, the fluoride-free fluxing agent is not used, and the production rhythm is improved. The performance index is compared as follows.
2. The white aluminum ash blocks which are byproducts of aluminum smelting industry are adopted to play roles of environment-friendly fluxing and metal aluminum heating agents on one hand, and on the other hand, the fluxing agent cost is reduced. (note: about half the price of fluorite)
3. The mineral calcite is adopted as the gas generating agent in a large proportion, so that the deep diffusion stirring effect is realized, the use proportion of the small threo is reduced, and the cost of a finished product is reduced.
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 mixture A according to the invention.
FIG. 2 is a flow chart of the production process of the mixture B according to the invention.
FIG. 3 is a flow chart of the KR treatment process of the present invention.
Description of the embodiments
The invention has the functions of desulfurization and slagging, environment-friendly fluxing, gas generation and stirring, heating and warming, low cost, low pollution, low unit consumption, high efficiency and the like. After the KR desulfurizing agent is put into use, compared with a common KR desulfurizing agent, the end point sulfur of pretreatment desulfurization is reduced to below 0.002 percent from 0.010 percent, the unit consumption is less than 0.26 kg/(ton iron multiplied by sulfur), and the temperature in the pretreatment process is reduced to below 35 ℃ from 45-55 ℃; and meanwhile, an environment-friendly fluxing agent is used, so that corrosion of refractory materials is reduced, overhaul amount is reduced, and production rhythm is improved.
1. In order to improve the desulfurization effect and increase the sulfur capacity, the ultra-low carbon low sulfur metallurgical lime (patent ZL2012 1 0358390.0) is designed to replace the original ordinary lime used by the customer side, and meanwhile, the lime adding proportion is improved. On one hand, the alkalinity is improved, and the sulfur capacity is further improved; on the other hand, the content of sulfur carried in lime is reduced.
2. And the fluorite is replaced by the environment-friendly fluoride-free fluxing agent, so that corrosion to the refractory is reduced.
3. To increase production cadence, one starts by improving desulfurization kinetics: on one hand, a small amount of gas generating agent is added to play a role in deep diffusion and stirring; on the other hand, a trace amount of heat generating agent is added to improve the pretreatment temperature of molten iron.
4. The final formulation scheme is as follows: novel KR desulfurizing agent = slag former + environment-friendly fluxing agent + gas generator + heat generator + binder.
5. The environment-friendly fluxing agent and the heating agent adopt white aluminum ash, namely a compound with low melting point formed by aluminum oxide and calcium oxide, and meanwhile, the white aluminum ash contains a small amount of metal aluminum to generate heat in the oxidation process of molten iron, so that the pretreatment temperature of the molten iron is improved.
6. The gas generating agent adopts high-purity mineral calcite powder (the calcium carbonate content is more than or equal to 98 percent) and baking soda, plays a role in deep diffusion and stirring in the process of thermal decomposition of molten iron, and simultaneously additionally provides the alkalinity of slag to promote desulfurization.
7. The slag former and the environment-friendly fluxing agent (containing a heat generating agent) are crushed and crushed, then are mixed uniformly according to a proportion, are sprayed with a binder, are mixed uniformly again, are rolled into strips with the thickness of 100mm multiplied by 10mm multiplied by 6mm by a high-pressure roller press, naturally fall into a whole grain crusher to be crushed, are screened out a mixture A with qualified granularity, and are subjected to external circulation to enter the roller press again for molding.
8. The high-grade calcite is crushed and sieved to obtain qualified granularity (1-6 mm), and the qualified granularity is uniformly mixed with sodium bicarbonate according to a proportion to form a mixture B.
9. In the use process, the proportion of the mixture A and the mixture B is controlled by metering the feeding amount to form the composite functional desulfurizing agent, and the composite functional desulfurizing agent enters a KR pretreatment process to desulfurize molten iron.
The production process of the composite functional desulfurizing agent comprises the following steps: 1) The production process of the mixture A comprises the following steps: the slag former and the environment-friendly fluxing agent (containing a heat generating agent) are crushed and crushed, uniformly mixed according to a proportion, sprayed with a binder, uniformly mixed again, rolled into strips with the thickness of 100mm multiplied by 10mm multiplied by 6mm by a high-pressure roller press, naturally dropped into a whole grain crusher to be crushed, screened out a mixture A with qualified granularity, stored in a high-level bin a, and the unqualified powder enters the roller press again to be molded through external circulation. 2) The production process of the mixture B comprises the following steps: the high-grade calcite is crushed and sieved to obtain qualified granularity (1-6 mm), and then the qualified granularity is uniformly mixed with sodium bicarbonate according to a proportion to form a mixture B, and the mixture B enters a high-level storage bin B. 3) And (3) KR treatment process.
Examples
1. And (3) preparing and producing the composite functional desulfurizing agent.
(1) Raw material preparation, wherein the mass ratio of the components is as follows: 60-80% of ultra-low carbon low sulfur lime (C is less than 0.2%, S is less than 0.02%, caO is more than or equal to 90%), 15-25% of aluminum white ash (metal aluminum 20-40% and alumina 50-70%) which is an industrial byproduct of aluminum smelting, and calcite (CaCO) 3 More than or equal to 95 percent) of 10 to 20 percent, sodium bicarbonate of 1 to 5 percent and a binder (phenolic resin) of 0.3 to 0.5 percent.
(2) And distributing the raw materials to produce a mixture A and a mixture B according to the production process of the drawing. 1) The production process of the mixture A comprises the following steps: the slag former and the environment-friendly fluxing agent (containing a heat generating agent) are crushed and crushed, uniformly mixed according to the proportion of 4:1, sprayed with a binder, uniformly mixed again, rolled into strips with the thickness of 100mm multiplied by 10mm multiplied by 6mm by a high-pressure roller press, naturally dropped into a whole grain crusher to be crushed, screened out a mixture A with qualified granularity, stored in a high-level bin a, and the unqualified powder enters the roller press again to be molded through external circulation. 2) The production process of the mixture B comprises the following steps: the high-grade calcite is crushed and sieved to obtain qualified granularity (1-6 mm), and then the qualified granularity and the baking soda are uniformly mixed according to the proportion of 4:1 to form a mixture B, and the mixture B enters a high-level storage bin B.
2. Using process
And (3) respectively weighing the mixture A and the mixture B by metering, and controlling the ratio of the mixture A to the mixture B to be 5:1 to form the composite functional desulfurizing agent. And (5) performing desulfurization stirring treatment in the KR process.
3. Effect of use
And respectively weighing the mixture A and the mixture B by weighing, mixing according to the proportion of 5:1, adding into a hot metal ladle, and stirring by a KR stirring head to perform deep desulfurization pretreatment before full-quantity molten iron vanadium extraction. Through a large-batch molten iron desulfurization pretreatment (for full-scale molten iron vanadium extraction) test, the test effect is as follows: 1) The end point sulfur (post sulfur) of the pretreatment desulfurization is reduced from 0.010 percent to less than 0.002 percent, and the unit consumption is less than 0.26 kg/(ton iron x sulfur); 2) The temperature drop in the pretreatment process is reduced from 45-55 ℃ to below 35 ℃; 3) And the environment-friendly fluxing agent is used, so that corrosion of refractory materials is reduced, overhaul amount is reduced, and production rhythm is improved.
(1) The desulfurization and temperature drop conditions before the test are shown in the following table.
(2) The desulfurization and temperature drop conditions of the product are shown in the following table.
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 high-efficiency composite functional desulfurizing agent for molten iron pretreatment is characterized in that: comprising the following steps: 60-80% of ultra-low carbon low sulfur lime, 15-25% of aluminum ash which is an industrial byproduct of aluminum smelting, 10-20% of calcite, 1-5% of baking soda and 0.3-0.5% of binder.
2. A preparation method of a composite functional desulfurizing agent for high-efficiency molten iron pretreatment is characterized by comprising the following steps: the method comprises the following steps:
step one: crushing and crushing ultralow-carbon low-sulfur lime and white aluminum ash serving as an industrial byproduct of aluminum smelting, uniformly mixing the crushed and crushed white aluminum ash according to the ratio of 4:1, spraying 0.3-0.5% of binder, uniformly mixing the mixture again, rolling the mixture into strips through a high-pressure roller press, naturally dropping the strips into a whole grain crusher to crush the strips, screening out a mixture A with the qualified granularity of 1-6mm, and forming unqualified powder through external circulation into the roller press again;
step two: the calcite is crushed and sieved to obtain qualified granularity of 1-6mm, and then is uniformly mixed with baking soda according to the proportion of 4:1 to form a mixture B;
step three: and respectively weighing the mixture A and the mixture B by weighing, mixing according to the proportion of 5:1 to form a composite functional desulfurizing agent, adding the composite functional desulfurizing agent into a hot metal ladle, stirring the composite functional desulfurizing agent by a KR stirring head, and performing deep desulfurization pretreatment before full-scale molten iron vanadium extraction.
3. The high-efficiency composite functional desulfurizing agent for molten iron pretreatment according to claim 1, which is characterized in that: the ultra-low carbon low sulfur lime is as follows: c is less than 0.2%, S is less than 0.02%, caO is more than or equal to 90%, aluminum refining industry byproduct white aluminum ash is 20-40% of metallic aluminum, aluminum oxide is 50-70%, and calcite is CaCO 3 More than or equal to 95 percent, and the binder is phenolic resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310705424.7A CN117344077A (en) | 2023-06-15 | 2023-06-15 | High-efficiency composite functional desulfurizing agent for molten iron pretreatment and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310705424.7A CN117344077A (en) | 2023-06-15 | 2023-06-15 | High-efficiency composite functional desulfurizing agent for molten iron pretreatment and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
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| CN117344077A true CN117344077A (en) | 2024-01-05 |
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ID=89358201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310705424.7A Pending CN117344077A (en) | 2023-06-15 | 2023-06-15 | High-efficiency composite functional desulfurizing agent for molten iron pretreatment and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117344077A (en) |
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2023
- 2023-06-15 CN CN202310705424.7A patent/CN117344077A/en active Pending
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