CN116949239A - Converter smelting method for replacing light burned dolomite with RH gunning mix waste refractory - Google Patents
Converter smelting method for replacing light burned dolomite with RH gunning mix waste refractory Download PDFInfo
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- CN116949239A CN116949239A CN202310803720.0A CN202310803720A CN116949239A CN 116949239 A CN116949239 A CN 116949239A CN 202310803720 A CN202310803720 A CN 202310803720A CN 116949239 A CN116949239 A CN 116949239A
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- Prior art keywords
- slag
- burned dolomite
- waste refractory
- gunning
- light burned
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- 229910000514 dolomite Inorganic materials 0.000 title claims abstract description 67
- 239000010459 dolomite Substances 0.000 title claims abstract description 67
- 239000002699 waste material Substances 0.000 title claims abstract description 64
- 238000003723 Smelting Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000002893 slag Substances 0.000 claims abstract description 94
- 239000000463 material Substances 0.000 claims abstract description 92
- 239000011819 refractory material Substances 0.000 claims abstract description 51
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 21
- 239000001301 oxygen Substances 0.000 claims abstract description 21
- 238000007664 blowing Methods 0.000 claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 15
- 239000010959 steel Substances 0.000 claims abstract description 15
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 230000001502 supplementing effect Effects 0.000 claims abstract description 11
- 230000009467 reduction Effects 0.000 claims abstract description 8
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 7
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 7
- 239000004571 lime Substances 0.000 claims description 7
- 239000000654 additive Substances 0.000 claims 1
- 230000000996 additive effect Effects 0.000 claims 1
- 238000004064 recycling Methods 0.000 abstract description 9
- 230000007797 corrosion Effects 0.000 description 10
- 238000005260 corrosion Methods 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 230000008901 benefit Effects 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 4
- 230000008092 positive effect Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005272 metallurgy Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/36—Processes yielding slags of special composition
-
- 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
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The application relates to the technical field of recycling of RH gunning material waste refractory resources and converter smelting, in particular to a converter smelting method for replacing light burned dolomite with RH gunning material waste refractory. The method comprises the following steps: obtaining slag auxiliary materials; the method comprises the steps of taking light burned dolomite as a first slag auxiliary material, replacing at least part of light burned dolomite with RH gunning material waste refractory material to be taken as a second slag auxiliary material, controlling the replacement ratio of the RH gunning material waste refractory material to the light burned dolomite, and supplementing a third slag auxiliary material according to the reduction amount of the light burned dolomite; according to the volume of oxygen blowing, the slag auxiliary materials are added in stages according to the corresponding addition amount, so as to carry out converter smelting on molten steel. The application solves the technical problem that the existing RH gunning mix waste refractory is difficult to fully utilize in high efficiency.
Description
Technical Field
The application relates to the technical field of recycling of RH gunning material waste refractory resources and converter smelting, in particular to a converter smelting method for replacing light burned dolomite with RH gunning material waste refractory.
Background
The annual consumption of refractory materials in the steel industry in China is approximately 1000 ten thousand tons, and the annual consumption of waste refractory materials is approximately 400 ten thousand tons. Most of the waste refractory materials are directly sold or buried, only a small amount of the waste refractory materials are reused, and the comprehensive utilization rate is low. The recycling of the waste refractory material is one of the problems to be solved in the development of green low carbon of iron and steel enterprises, and the recycling of the waste refractory material can not only realize circular economy and improve the economic benefit of enterprises, but also bring remarkable environmental and social benefits.
The RH gunning mix is used for gunning an RH dip pipe, a large amount of RH gunning mix waste refractory materials are generated in the maintenance process of the RH dip pipe, the current refractory materials are sold as waste refractory materials, the characteristics of the materials are not fully combined for recycling, low carbon emission reduction is not facilitated, the development of metallurgical green is realized, and certain influence is caused on environmental protection. The content of MgO in the RH gunning mix waste refractory material is 60-90%, the content of Al2O3 is 10-30%,
the MgO content of converter slag needs to be controlled at 7-13% to reduce the corrosion of the furnace lining by the slag, the main source of MgO in the slag is light-burned dolomite which is added into the furnace and has an MgO content of 30-38% and the consumption of about 19kg/t per ton of steel, so that the method for recycling the resources of the RH gunning material waste refractory can be developed by combining the characteristics of the RH gunning material waste refractory.
Disclosure of Invention
The application provides a converter smelting method for replacing light burned dolomite with RH gunning material waste refractory, which aims to solve the technical problem that the existing RH gunning material waste refractory is difficult to be fully utilized with high efficiency.
In a first aspect, the application provides a converter smelting method for replacing light burned dolomite with RH gunning mix waste refractory, which comprises the following steps:
obtaining slag auxiliary materials; the method comprises the steps of taking light burned dolomite as a first slag auxiliary material, replacing at least part of light burned dolomite with RH gunning material waste refractory material to be taken as a second slag auxiliary material, controlling the replacement ratio of the RH gunning material waste refractory material to the light burned dolomite, and supplementing a third slag auxiliary material according to the reduction amount of the light burned dolomite;
according to the volume of oxygen blowing, the slag auxiliary materials are added in stages according to the corresponding addition amount, so as to carry out converter smelting on molten steel.
Optionally, the replacement ratio of the RH gunning mix waste refractory material to the light burned dolomite is 1:2-2.5.
Optionally, the supplementing the third slag auxiliary material according to the reduction amount of the light burned dolomite comprises:
supplementing a third slag auxiliary material with the first weight when the light burned dolomite is reduced by 1 ton; wherein the first weight is 500-700kg.
Optionally, the first weight is 550-650kg.
Optionally, the third slag auxiliary material is lime.
Optionally, the adding the slag auxiliary materials according to the volume of oxygen blowing in stages and the corresponding adding amount to perform converter smelting on molten steel comprises the following steps:
when the volume of oxygen blowing reaches 4-8%, adding the slag auxiliary materials with the first-stage adding amount;
when the volume of oxygen blowing reaches 18-22%, adding the residual slag auxiliary materials to perform converter smelting on molten steel.
Optionally, the first stage is added in an amount of 75-85 wt%.
Optionally, the first stage is added in an amount of 80 wt%.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
according to the converter smelting method for replacing light-burned dolomite with the RH gunning refractory waste refractory material, provided by the embodiment of the application, aiming at the defects that the current refractory material is sold as the waste refractory material, the characteristics of the material are not fully combined for recycling, low carbon emission reduction is not facilitated, the metallurgical green development is realized, and certain influence is caused on environmental protection, the converter smelting is carried out by replacing at least part of light-burned dolomite with the RH gunning refractory waste refractory material as slag auxiliary materials, so that the comprehensive utilization of the resources of the RH gunning refractory waste refractory material is realized, the consumption of light-burned dolomite in the converter smelting process is reduced, the effective utilization of the resources is realized while the smelting cost is reduced, the assistance of green metallurgy is realized, and the low carbon emission reduction is realized.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic flow chart of a converter smelting method for replacing light burned dolomite with RH gunning refractory waste refractory provided by the embodiment of the application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Various embodiments of the application may exist in a range of forms; it should be understood that the description in a range format is merely for convenience and brevity and should not be construed as a rigid limitation on the scope of the application; it is therefore to be understood that the range description has specifically disclosed all possible sub-ranges and individual values within that range. For example, it should be considered that a description of a range from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5, and 6, wherever applicable. In addition, whenever a numerical range is referred to herein, it is meant to include any reference number (fractional or integer) within the indicated range.
In the present application, unless otherwise specified, terms such as "upper" and "lower" are used specifically to refer to the orientation of the drawing in the figures. In addition, in the description of the present specification, the terms "include", "comprising" and the like mean "including but not limited to". Relational terms such as "first" and "second", and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Herein, "and/or" describing an association relationship of an association object means that there may be three relationships, for example, a and/or B, may mean: a alone, a and B together, and B alone. Wherein A, B may be singular or plural. Herein, "at least one" means one or more, and "a plurality" means two or more. "at least one", "at least one" or the like refer to any combination of these items, including any combination of single item(s) or plural items(s). For example, "at least one (individual) of a, b, or c," or "at least one (individual) of a, b, and c," may each represent: a, b, c, a-b (i.e., a and b), a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple, respectively.
Unless otherwise specifically indicated, the various raw materials, reagents, instruments, equipment and the like used in the present application are commercially available or may be prepared by existing methods.
In a first aspect, the present application provides a converter smelting method for replacing light burned dolomite with RH gunning mix waste refractory, referring to fig. 1, the method includes:
the MgO content of converter slag needs to be controlled at 7-13% to reduce the corrosion of the furnace lining by the slag, the main source of MgO in the slag is light-burned dolomite which is added into the furnace and has an MgO content of 30-38% and the consumption of about 19kg/t per ton of steel, so that the method for recycling the resources of the RH gunning material waste refractory can be developed by combining the characteristics of the RH gunning material waste refractory.
S1, obtaining slag auxiliary materials; the method comprises the steps of taking light burned dolomite as a first slag auxiliary material, replacing at least part of light burned dolomite with RH gunning material waste refractory material to be taken as a second slag auxiliary material, controlling the replacement ratio of the RH gunning material waste refractory material to the light burned dolomite, and supplementing a third slag auxiliary material according to the reduction amount of the light burned dolomite;
in some embodiments, the replacement ratio of the RH gunning mix waste refractory to the light burned dolomite is 1:2-2.5.
The RH gunning mix is applied to converter smelting by utilizing the component characteristics of 60-90% of MgO in the waste refractory material, and is added in the blowing process to replace light burned dolomite so as to supplement the MgO content in slag. Firstly, recycling RH gunning material waste refractory materials, conveying the RH gunning material waste refractory materials with the particle size being adapted to a high-level bin of a converter, and calculating the addition amount of slag auxiliary materials before converter smelting based on the component characteristics of the RH gunning material waste refractory materials, such as 60-90% of MgO, 30-38% of light burned dolomite and 48-52% of CaO, wherein the RH gunning material waste refractory materials are utilized to replace the MgO content in the light burned dolomite supplementary slag.
The replacement ratio of the RH gunning material waste refractory material to the light burned dolomite is controlled to be 1: 2-2.5: the MgO content in the converter slag is effectively supplemented, and the corrosion of the converter refractory is reduced. If the ratio of the substitution is too high, the MgO content in the converter slag is reduced to a certain extent, and the corrosion of the furnace lining is aggravated; if the ratio of the substitute is too low, the MgO content of the slag is increased to a certain extent, the effect of increasing the viscosity of the slag is poor, and the completion of smelting tasks is not facilitated. Specifically, the substitution ratio may be 1:2. 1:2.3, 1:2.5, etc.
In some embodiments, the supplementing the third slag supplementary material according to the reduced amount of the light burned dolomite comprises:
supplementing a third slag auxiliary material with the first weight when the light burned dolomite is reduced by 1 ton; wherein the first weight is 500-700kg.
In some embodiments, the first weight is 550-650kg.
In some embodiments, the third slag adjunct is lime.
The third slag auxiliary material with the weight of 500-700kg is supplemented when the light burned dolomite is reduced by 1 ton: supplementing the CaO content in the slag ensures the completion of the dephosphorization task. If the weight of the third slag auxiliary material is too high, the CaO content in the slag is increased to a certain extent, the viscosity of the slag is high, and the slag melting effect is poor; the third slag auxiliary material has the advantages that the weight is too low, the CaO content in the slag can be reduced to a certain extent, the CaO activity in the slag is low, and the dephosphorization effect is poor. Specifically, the weight of the third slag auxiliary material can be 500kg, 600kg, 700kg and the like. Preferably, the weight of the third slag auxiliary material is 550-650kg.
The lime is selected as the third slag auxiliary material and has the positive effects that: the alkalinity of slag is improved, dephosphorization task is completed, and corrosion to the revolving furnace refractory is reduced.
S2, adding the slag auxiliary materials according to the volume of oxygen blowing in stages and the corresponding addition amount to perform converter smelting on the molten steel.
In some embodiments, the adding the slag auxiliary materials according to the volume of oxygen blowing in stages and corresponding adding amounts to perform converter smelting on molten steel comprises:
when the volume of oxygen blowing reaches 4-8%, adding the slag auxiliary materials with the first-stage adding amount;
when the volume of oxygen blowing reaches 18-22%, adding the residual slag auxiliary materials to perform converter smelting on molten steel.
When the volume of oxygen blown by the converter reaches 4-8%, adding the first-stage slag auxiliary materials, and the positive effects are that: improves the slag melting effect, promotes early slag formation and dephosphorizes efficiently when the temperature of molten steel is low.
When the volume of oxygen blown by the converter reaches 18-22%, adding the rest slag auxiliary materials, and the positive effects are that: the CaO and MgO contents in the slag are supplemented, the alkalinity of the slag is improved, the return drying of the slag is reduced, and the slag melting and dephosphorization effects are improved; the MgO content in the final slag of the converter is controlled to be 7-13%, so that the corrosion of the slag to the lining of the converter is reduced, and the comprehensive utilization of resources of the RH gunning material waste refractory is realized.
In some embodiments, the first stage is added in an amount of 75 to 85 weight percent.
In some embodiments, the first stage addition is 80 wt%.
The positive effect of controlling the adding amount of the first-stage slag auxiliary materials to be 75-85% by weight is that: the CaO and MgO in the slag in the earlier stage of smelting are ensured to be improved to the target level, the slag formation in the earlier stage of smelting is promoted, the dephosphorization effect is improved, and the corrosion of refractory materials is reduced. If the adding amount of the slag auxiliary materials is too high in the stage, carbon-oxygen reaction is limited to a certain extent, and even blowing reaction of a converter is possibly interrupted; if the adding amount of slag auxiliary materials is too low in the stage, the CaO and MgO contents of slag in the earlier stage of smelting are lower than the target level to a certain extent, the dephosphorization effect in the earlier stage of smelting is poor, the slag alkalinity is low, and the furnace lining is eroded. Specifically, the addition amount of the slag auxiliary materials at the stage can be 75 wt%, 80 wt%, 85 wt% and the like. Preferably, the addition amount of the slag auxiliary materials in the stage is 80 weight percent.
The application will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present application and are not intended to limit the scope of the present application. The experimental procedures, which are not specified in the following examples, are generally determined according to national standards. If the corresponding national standard does not exist, the method is carried out according to the general international standard, the conventional condition or the condition recommended by the manufacturer.
Example 1
The method comprises the steps of smelting a certain heat, detecting the MgO content of an RH spray-repairing waste refractory material to 70%, the MgO content of the light-burned dolomite to 36%, the CaO content to 50%, and calculating to obtain the light-burned dolomite addition 4500kg by combining molten iron components, wherein the heat uses the RH spray-repairing waste refractory material to replace the light-burned dolomite, the RH spray-repairing waste refractory material to replace 1944kg of the light-burned dolomite is pre-calculated to be added to 1000kg of the RH spray-repairing waste refractory material before smelting, the supplementary lime 1143kg is added, namely 1000kg of the MgO raw and auxiliary materials, namely the RH spray-repairing waste refractory material and 2556kg of the light-burned dolomite, when the oxygen blowing amount of a converter reaches 6%, 80% of slag auxiliary materials, namely 800kg of the RH spray-repairing waste refractory material and 2045kg of the light-burned dolomite are added, and when the oxygen blowing amount of the converter reaches 20%, the residual slag auxiliary materials of 20% are added, namely 200kg of the RH spray-repairing refractory material and 511kg of the light-burned dolomite, the MgO content of the final slag component MgO of the converter is 11%, the smelting process is normal, and obvious corrosion of a converter lining is not seen through the converter lining.
Example 2
Smelting a certain heat, detecting 75% of MgO content of an RH spray-repairing waste refractory material, 35% of light-burned dolomite, 50% of CaO content, and calculating to obtain 4300kg of light-burned dolomite by combining molten iron components, wherein the heat uses the RH spray-repairing waste refractory material to replace the light-burned dolomite, the heat is pre-calculated to add 1500kg of the RH spray-repairing waste refractory material to replace 3210kg of light-burned dolomite, 1888kg of supplementary lime, namely 1500kg of MgO raw and auxiliary materials, namely 1200kg of RH spray-repairing waste refractory material and 1090kg of light-burned dolomite, when the oxygen blowing amount of a converter reaches 6%, 80% of slag auxiliary materials, namely 1200kg of RH spray-repairing waste refractory material and 872kg of light-burned dolomite, and when the oxygen blowing amount of the converter reaches 20%, adding the rest 20% of slag auxiliary materials, namely 300kg of RH spray-repairing refractory material and 218kg of light-burned dolomite, wherein the MgO content of the final slag component of the converter is 12%, the smelting process of the converter is normal, and no obvious corrosion of the converter lining is observed through the converter lining.
Example 3
Smelting a certain heat, detecting 76% of MgO content of an RH gunning material waste refractory material, 34% of light burned dolomite, 49% of CaO content, and calculating to obtain 4200kg of light burned dolomite by combining molten iron components, wherein 1600kg of RH gunning material waste refractory material is used for replacing light burned dolomite in the heat, 3200kg of light burned dolomite is replaced by precalculated addition of the original auxiliary materials before smelting, 1868kg of supplementary lime, namely 1600kg of MgO type original auxiliary materials, namely the RH gunning material waste refractory material, 1000kg of light burned dolomite, 80% of slag auxiliary materials, namely 1280kg of RH gunning material waste refractory material and 800kg of light burned dolomite are added when the oxygen blowing amount of the converter is 6%, and the rest 20% of slag auxiliary materials, namely 320kg of RH gunning material refractory material and 200kg of light burned dolomite are added when the oxygen blowing amount of the converter is 20%, the MgO content of the final slag component of the converter is 12.5%, the smelting process of the converter is normal, and obvious corrosion of the converter lining is not seen through the converter lining.
By adopting the method provided by the embodiment of the application, the RH gunning material waste refractory material is used for converter smelting instead of at least part of light burned dolomite as slag auxiliary material, so that the comprehensive utilization of resources of the RH gunning material waste refractory material is realized, the consumption of light burned dolomite in the converter smelting process is reduced, the smelting cost is reduced, the effective utilization of resources is realized, the power-assisted green metallurgy is realized, and the emission is reduced at low carbon.
The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The converter smelting method for replacing light burned dolomite with RH gunning refractory waste refractory is characterized by comprising the following steps of:
obtaining slag auxiliary materials; the method comprises the steps of taking light burned dolomite as a first slag auxiliary material, replacing at least part of light burned dolomite with RH gunning material waste refractory material to be taken as a second slag auxiliary material, controlling the replacement ratio of the RH gunning material waste refractory material to the light burned dolomite, and supplementing a third slag auxiliary material according to the reduction amount of the light burned dolomite;
according to the volume of oxygen blowing, the slag auxiliary materials are added in stages according to the corresponding addition amount, so as to carry out converter smelting on molten steel.
2. The method according to claim 1, wherein the replacement ratio of the RH gunning mix waste refractory and the light burned dolomite is 1:2-2.5.
3. The method according to claim 1, wherein the supplementing of the third slag supplementary material according to the reduced amount of the light burned dolomite comprises:
supplementing a third slag auxiliary material with the first weight when the light burned dolomite is reduced by 1 ton; wherein the first weight is 500-700kg.
4. A method according to claim 3, wherein the first weight is 550-650kg.
5. A method according to claim 1 or 3, wherein the third slag additive is lime.
6. The method according to claim 1, wherein the step of adding the slag supplementary material in stages according to the volume of the blown oxygen in a corresponding addition amount to perform converter smelting on the molten steel comprises:
when the volume of oxygen blown by the converter reaches 4-8%, adding the slag auxiliary materials with the first-stage adding amount;
when the volume of oxygen blown by the converter reaches 18-22%, adding the residual slag auxiliary materials to perform converter smelting on the molten steel.
7. The method of claim 6, wherein the first stage is added in an amount of 75-85 wt%.
8. The method according to claim 6 or 7, wherein the first stage addition is 80 wt%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310803720.0A CN116949239A (en) | 2023-07-03 | 2023-07-03 | Converter smelting method for replacing light burned dolomite with RH gunning mix waste refractory |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310803720.0A CN116949239A (en) | 2023-07-03 | 2023-07-03 | Converter smelting method for replacing light burned dolomite with RH gunning mix waste refractory |
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| CN116949239A true CN116949239A (en) | 2023-10-27 |
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| CN202310803720.0A Pending CN116949239A (en) | 2023-07-03 | 2023-07-03 | Converter smelting method for replacing light burned dolomite with RH gunning mix waste refractory |
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| CN (1) | CN116949239A (en) |
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- 2023-07-03 CN CN202310803720.0A patent/CN116949239A/en active Pending
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