CN117778669A - Method for gasifying dephosphorization and recycling dephosphorization slag of converter final slag - Google Patents
Method for gasifying dephosphorization and recycling dephosphorization slag of converter final slag Download PDFInfo
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- CN117778669A CN117778669A CN202311797203.3A CN202311797203A CN117778669A CN 117778669 A CN117778669 A CN 117778669A CN 202311797203 A CN202311797203 A CN 202311797203A CN 117778669 A CN117778669 A CN 117778669A
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- 239000002893 slag Substances 0.000 title claims abstract description 210
- 238000000034 method Methods 0.000 title claims abstract description 60
- 238000004064 recycling Methods 0.000 title claims abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 109
- 239000010959 steel Substances 0.000 claims abstract description 109
- 238000002309 gasification Methods 0.000 claims abstract description 31
- 238000005245 sintering Methods 0.000 claims abstract description 28
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 21
- 238000003723 Smelting Methods 0.000 claims abstract description 18
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 13
- 239000007921 spray Substances 0.000 claims abstract description 12
- 238000007664 blowing Methods 0.000 claims abstract description 11
- 238000010079 rubber tapping Methods 0.000 claims abstract description 10
- 238000003756 stirring Methods 0.000 claims abstract description 7
- 239000000571 coke Substances 0.000 claims description 31
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 17
- 229910052799 carbon Inorganic materials 0.000 claims description 13
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 21
- 239000011574 phosphorus Substances 0.000 abstract description 21
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 20
- 239000007789 gas Substances 0.000 description 10
- 239000000463 material Substances 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 235000019738 Limestone Nutrition 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 239000004615 ingredient Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000006028 limestone Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000002241 glass-ceramic Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002686 phosphate fertilizer Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- 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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- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a method for gasifying and dephosphorizing converter final slag and recycling dephosphorized slag, which comprises the following steps: (1) After the converter smelting is completed and tapping is carried out, the steel slag is completely left in the converter; (2) Taking a steel slag sample, analyzing steel slag components, and according to steel slag FeO and P in a converter 2 O 5 Calculating the dosage of the carbonaceous dephosphorizing agent by the MnO content; (3) Adding a carbonaceous dephosphorizing agent into the converter at one time by a high-level bin to carry out gasification dephosphorization; (4) Lowering the spray gun to the slag adjusting gun position, and carrying out top-bottom combined blowing of nitrogen in the whole process to stir the steel slag in the furnace; (5) Pouring out 1/2-3/4 of dephosphorized slag after dephosphorization of the steel slag is finished; the dumped dephosphorization slag can be recycled to the sintering process; (6) Lifting the spray gun to a slag splashing furnace protection gun position, and performing slag splashing furnace protection operation; (7) After the slag splashing protection is finished, the residual dephosphorization slag is completely remained in the furnace for smelting of the next furnace. The method effectively solves the problem that the steel slag is difficult to utilize caused by the enrichment of the steel slag and the phosphorus.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy and metallurgical slag recycling, in particular to a method for gasifying dephosphorization of converter final slag and recycling dephosphorization slag.
Technical Field
In recent years, with the rapid development of the steel industry, the converter slag amount is increased year by year, and most enterprises adopt a stacking treatment method due to the high phosphorus content of the converter slag, so that the slag accumulation amount is huge, and a great amount of waste of latent heat and valuable components of the slag is brought. The components of the converter slag mainly comprise CaO, mgO, siO 2 、FeO、P 2 O 5 And the like, the treated steel slag is used as road building raw materials, cement micro powder, glass ceramics, agricultural phosphate fertilizer, sintered return ores and the like, but is limited by treatment cost and related industry standards, and the recycling utilization rate of the converter steel slag is less than 30%. The phosphorus enrichment limits the recycling of converter slag inside the steel plant. How to remove phosphorus in steel slag and recycle the phosphorus is always a research hot spot.
The gasification dephosphorization of converter steel slag is a relatively advanced slag treatment process proposed in recent years. The patent application with the application number of 202210259006.5 proposes a method for gasification dephosphorization and thermal recycling of converter slag, which is characterized in that in the whole process of converter smelting, hydrogen is blown to dephosphorize in a bottom blowing manner, slag is remained after tapping is finished, hydrogen is blown to dephosphorize in a bottom blowing manner continuously, meanwhile, top lance hydrogen is blown to stir, gasify and dephosphorize, the phosphorus content in the slag is reduced, dephosphorized slag is directly used for the next furnace smelting, and the phosphorus content in steel slag is reduced to 0.65-0.95%. The patent application with the application number of 201810938915.5 proposes a gasification dephosphorization and recycling method in a semisteel smelting converter final slag furnace, wherein the converter final slag is completely left in the furnace after the tapping of the converter, a SiC dephosphorization agent is added into the converter, dephosphorization is carried out by means of good dynamic conditions during slag splashing protection, and the gasification dephosphorization rate is improved, but the highest dephosphorization rate is only 30%. The patent application with the application number of 201810532361.9 proposes a dephosphorization converter final slag gasification dephosphorization method and a smelting method, 2/3 steel slag is remained in a converter after converter tapping is finished, coke powder and aluminum ash which is blown from the bottom are added to the top as dephosphorization agents, nitrogen is blown from the top and the bottom in a combined way, gasification dephosphorization efficiency is optimized in the slag adjustment operation and slag splashing furnace protection process, and the steel slag gasification dephosphorization rate is 25% -30%. The patent application with the application number of 201711182613.1 proposes a method for carrying out slag-retaining gasification dephosphorization and a cyclic utilization smelting method, after tapping, a part of slag is retained in a converter, 1/2 dephosphorization agent coke powder is added before slag splashing protection, 1/2 dephosphorization agent coke powder is added after nitrogen blowing of a gun begins, meanwhile, slag splashing is carried out through full-process bottom blowing of nitrogen gas for gasification dephosphorization, the highest gasification dephosphorization rate is only 42.02%, and the residual dephosphorization slag in the converter is used for the next smelting. The patent application with the application number of 201510561089.3 provides a method for protecting the converter by splashing slag of converter gas, which adopts the converter gas to replace nitrogen for protecting the converter by splashing slag, realizes rapid and efficient gasification dephosphorization during splashing slag protection, and reduces the steelmaking cost. The patent application with the application number of 200610012514.4 proposes a method for gasifying and removing phosphorus in slag in the slag protection process of a converter, wherein a carbonaceous dephosphorizing agent is added before the slag protection process for dephosphorizing, the dynamic condition in the slag splashing period is fully utilized, but the highest gasifying dephosphorizing rate only reaches 31.36%.
The invention is superior to the existing converter slag gasification dephosphorization process, which mainly adopts reducing agents such as silicon, coke powder and the like, has higher cost, is carried out in a slag splashing furnace protection stage after converter smelting is finished, is limited by the dephosphorization capability of slag in the smelting process, and is difficult to promote dephosphorization effect on the whole. In addition, the prior art fails to deeply and efficiently utilize the dephosphorized steel slag, and further needs to optimize the dephosphorization process of the steel slag to improve the dephosphorization rate and seek an efficient method for high-quality utilization of the converter steel slag.
The method for gasifying and dephosphorizing the converter final slag and recycling the dephosphorized slag, which is provided by the method, can solve or alleviate one or more problems in the prior art.
Disclosure of Invention
The invention aims to provide a method for gasifying and dephosphorizing converter final slag and recycling dephosphorized slag, which uses relatively cheap semi-coke as dephosphorizing agent and removes the semi-coke in a gasifying and dephosphorizing mode in the process of re-blowing nitrogen at the top and bottom of the converterPhosphorus in the whole furnace steel slag and returning the dephosphorized steel slag to the sintering process, so that the consumption of sintering auxiliary materials can be reduced, the cost can be saved, and the CO in the sintering process can be reduced 2 Is arranged in the air.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
a method for gasifying and dephosphorizing converter final slag and recycling dephosphorized slag comprises the following steps:
(1) After the converter smelting is completed and tapping is carried out, the steel slag is completely left in the converter;
(2) Taking a steel slag sample, analyzing steel slag components, and according to steel slag FeO and P in a converter 2 O 5 Calculating the consumption of the carbonaceous dephosphorizing agent required by the MnO content;
(3) Adding a carbonaceous dephosphorizing agent into the converter at one time by a high-level bin to carry out gasification dephosphorization;
(4) Lowering the spray gun to the slag adjusting gun position, and carrying out top-bottom combined blowing of nitrogen in the whole process to stir the steel slag in the furnace, so that the carbonaceous dephosphorizing agent is fully contacted with the steel slag, and the dynamic conditions of gasification dephosphorization of the steel slag are enhanced;
(5) Pouring out 1/2-3/4 of dephosphorized slag after dephosphorization of the steel slag is finished; the dumped dephosphorization slag can be recycled to the sintering process;
(6) Lifting the spray gun to a slag splashing furnace protection gun position, and performing slag splashing furnace protection operation;
(7) After the slag splashing protection is finished, the residual dephosphorization slag is completely remained in the furnace for smelting of the next furnace.
Further, the carbonaceous dephosphorizing agent is semi-coke.
Further, the fixed carbon content of the semi coke is 78-86%.
Further, the invention uses the semi-coke to reduce P in the steel slag 2 O 5 The required carbon equivalent of FeO and MnO is 1.2 times, and the specific calculation formula is as follows:
wherein: w (C): adding amount of semi coke, kg; w (slag): the weight of steel slag in the converter, kg; w (P) 2 O 5 % of the following: steel slag P 2 O 5 Content,%; w (FeO%): steel slag FeO content,%; w (MnO%): the MnO content of steel slag,%; a: fixed carbon content of semi coke; 0.3: based on laboratory results, the FeO reduction rate was calculated at 0.3; 1.2: reduction of P in steel slag 2 O 5 FeO and MnO require 1.2 times the carbon equivalent.
Further, the granularity of the semi coke is 0.1-8 mm.
Further, the gasification dephosphorization process of the steel slag in the step (3) lasts for 20-40 min.
The technical scheme of the invention is as follows:
according to the method, part of phosphorus is gasified and removed from the converter steel slag in the furnace, the low-phosphorus steel slag left in the furnace plays a role in reducing slag consumption in smelting of the next furnace, and the poured part can improve the proportion of the mixture during sintering, so that the problem that the steel slag is difficult to utilize due to the enrichment of the phosphorus in the steel slag is effectively solved.
The phosphorus element in the steel slag mainly comes from molten steel, and is calculated by theoretical balance of phosphorus element material flow in a blast furnace-converter process, and the phosphorus element in the molten steel mainly comes from blast furnace molten iron, converter slag-forming flux, converter slag remaining and slag protecting and scrap steel, and accounts for 67.7%, 0.4%, 32.0% and 0.003% respectively. The proportion of phosphorus carried by the slag left in the converter and the proportion of phosphorus carried by the slag guard are reduced, the proportion of phosphorus carried by the blast furnace molten iron is increased, and the phosphorus content of the sintered ore in the furnace is further widened, so that the sintered ore can be matched with dephosphorized steel slag with certain phosphorus content, the high-quality utilization of the back-matched sintering of the dephosphorized steel slag is realized, and meanwhile, the cost and the CO brought by the consumption of CaO-containing auxiliary materials in the sintering process can be reduced 2 And (5) discharging.
Compared with other prior art, the invention has the following advantages:
(1) The dephosphorization agent adopted in the gasification dephosphorization of the steel slag is semi-coke, and has high activity, low sulfur content, good dephosphorization effect and low purchase cost;
(2) The whole dephosphorization process of the steel slag is carried out in a converter, the reaction dynamics condition is excellent, the gasification dephosphorization rate is 50-65%, the dephosphorization rate is high, the waste heat of the steel slag and the inside of the converter is fully utilized, and the heat efficiency of the converter is improved;
(3) The phosphorus content of the slag and the slag protection slag remained in the converter after dephosphorization is low, the blast furnace molten iron with high phosphorus content can be received, and meanwhile, the lime consumption can be reduced by the slag retention operation of the converter;
(4) The gasification dephosphorization of the steel slag can generate a large amount of CO which enters the converter gas, so that the calorific value of the converter gas is increased;
(5) The dephosphorized steel slag is matched with sintering, so that the consumption of sintering auxiliary materials can be reduced, and further the production cost and the CO of the sintering process are reduced 2 And (5) discharging.
Drawings
FIG. 1 is a specific schematic diagram of gasification dephosphorization and dephosphorization slag back-mixing sintering cyclic utilization of converter final slag.
Detailed Description
Specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which are incorporated in and constitute a part of this application, and together with the examples of the invention illustrate embodiments of the invention.
Examples
The converter of a certain enterprise steel mill is 100 tons, and the final slag gasification dephosphorization method of the converter, as shown in figure 1, comprises the following steps:
(1) After tapping of the converter is finished, the steel slag is completely left in the converter;
(2) Taking a steel slag sample and analyzing steel slag components as shown in table 1;
the components and performance indexes of the carbon dephosphorization agent semi coke are shown in table 2;
in this example, about 7 tons of steel slag were produced by 100 ton converter smelting, and FeO and P in Table 1 were calculated from 7 tons of steel slag 2 O 5 The MnO content and the fixed carbon content of the semi-coke in Table 2 are substituted into a calculation formula, and the calculation formula is as follows:
the calculated amount of semi coke was 263kg.
(3) 263kg of semi-coke with granularity of 0.1-3 mm is added into the converter in a bag mode at one time from a high-level bin;
(4) Lowering the spray gun to the slag adjusting gun position, and carrying out top-bottom combined blowing of nitrogen in the whole process to stir the steel slag in the furnace, so that the semi-coke is fully contacted with the steel slag, and the dynamic conditions of gasification dephosphorization of the steel slag are enhanced;
(5) Pouring out 1/2 of dephosphorized slag after dephosphorizing the steel slag for 40min, returning to a sintering process to serve as sintering auxiliary materials, and fully utilizing CaO in the steel slag;
(6) Lifting the spray gun to a slag splashing furnace protection gun position, regulating the nitrogen flow to a slag splashing furnace protection level, and performing slag splashing furnace protection operation;
taking converter gasified dephosphorization slag, and accounting to obtain steel slag with a gasification dephosphorization rate of 64.62 percent and a dephosphorization rate higher, wherein 818kg of CO and 434kg of metal Fe are generated by dephosphorization of 7 tons of steel slag, wherein CO enters converter gas, and the calorific value of the converter gas is improved.
The back-matched sintering proportion of dephosphorization steel slag is 6%, the cost is reduced by 66.65 yuan through reducing auxiliary material consumption in each ton of sintering by accounting production, and the calcium ash used in the sintering ingredients is obtained by decomposing limestone and generating CO 2 ：CaCO 3 →CaO+CO 2 Back-mixing 6% dephosphorized steel slag to produce CO of each ton of sinter 2 The discharge amount was reduced by 9.17kg.
Examples
The converter of a certain enterprise steel mill is 100 tons, and the final slag gasification dephosphorization method of the converter, as shown in figure 1, comprises the following steps:
(1) After tapping of the converter is finished, the steel slag is completely left in the converter;
(2) Taking a steel slag sample and analyzing steel slag components as shown in table 3;
the components and performance indexes of the carbon dephosphorization agent semi coke are shown in table 4;
in this example, about 6.5 tons of steel slag was produced by 100 tons of converter smelting, and FeO and P in Table 3 were calculated from 6.5 tons of steel slag 2 O 5 The MnO content, and the fixed carbon content of the semi coke in Table 4 are substituted into a calculation formula, and the calculation formula is as follows:
the calculated amount of semi coke was 254kg.
(3) 254kg of semi coke is added into the converter in a bag mode at one time from a high-level bin, and the granularity of the semi coke is 2-6 mm;
(4) Lowering the spray gun to the slag adjusting gun position, and carrying out top-bottom combined blowing of nitrogen in the whole process to stir the steel slag in the furnace, so that the semi-coke is fully contacted with the steel slag, and the dynamic conditions of gasification dephosphorization of the steel slag are enhanced;
(5) Pouring out 1/2 of dephosphorized slag after dephosphorizing the steel slag for 30min, returning to a sintering process to serve as sintering auxiliary materials, and fully utilizing CaO in the steel slag;
(6) Lifting the spray gun to a slag splashing furnace protection gun position, regulating the nitrogen flow to a slag splashing furnace protection level, and performing slag splashing furnace protection operation;
taking converter gasified dephosphorization slag, and accounting to obtain steel slag with a gasification dephosphorization rate of 58.69 percent and a dephosphorization rate higher, wherein 6.5 tons of steel slag are dephosphorized to generate 736kg of CO and 355kg of metal Fe, wherein the CO enters converter gas, and the calorific value of the converter gas is improved.
The back-matched sintering proportion of dephosphorization steel slag is 5%, each ton of sintering is produced by accounting, the consumption of auxiliary materials is reduced, the cost is reduced by 56.33 yuan, the calcium ash used for sintering the ingredients is obtained by decomposing limestone, and CO is produced 2 ：CaCO 3 →CaO+CO 2 Back-mixing 5% dephosphorized steel slag to produce CO of each ton of sinter 2 The discharge amount was reduced by 6.74kg.
Examples
The converter of a certain enterprise steel mill is 100 tons, and the final slag gasification dephosphorization method of the converter, as shown in figure 1, comprises the following steps:
(1) After tapping of the converter is finished, the steel slag is completely left in the converter;
(2) Taking a steel slag sample and analyzing steel slag components as shown in table 5;
the components and performance indexes of the carbon dephosphorization agent semi coke are shown in table 6;
in this example, about 7.5 tons of steel slag were produced by 100 ton converter smelting, and FeO and P in Table 5 were calculated on 7.5 tons of steel slag 2 O 5 The MnO content and the fixed carbon content of the semi coke in Table 6 are substituted into a calculation formula, and the calculation formula is as follows:
the calculated amount of semi coke was 267kg.
(3) 267kg of semi-coke with the granularity of 4-8 mm is added into the converter in a bag mode at one time from a high-level bin;
(4) Lowering the spray gun to the slag adjusting gun position, and carrying out top-bottom combined blowing of nitrogen in the whole process to stir the steel slag in the furnace, so that the semi-coke is fully contacted with the steel slag, and the dynamic conditions of gasification dephosphorization of the steel slag are enhanced;
(5) Pouring 3/4 of dephosphorized slag after dephosphorizing the steel slag for 20min, returning to a sintering process to be used as sintering auxiliary materials, and fully utilizing CaO in the steel slag;
(6) Lifting the spray gun to a slag splashing furnace protection gun position, regulating the nitrogen flow to a slag splashing furnace protection level, and performing slag splashing furnace protection operation;
taking converter gasified dephosphorization slag, and accounting to obtain the steel slag with the gasification dephosphorization rate of 52.31 percent and the dephosphorization rate of higher, wherein 7.5 tons of steel slag are dephosphorized to generate 804kg of CO and 372kg of metal Fe, wherein the CO enters converter gas, and the calorific value of the converter gas is improved.
The back-mixing sintering proportion of the dephosphorization steel slag is 4 percent, and the dephosphorization steel slag is sintered byAccounting production reduces auxiliary material consumption per ton of sintering, reduces the cost by 44.32 yuan, and calcium ash used for sintering ingredients is decomposed by limestone and generates CO 2 ：CaCO 3 →CaO+CO 2 4% dephosphorization steel slag is back matched to produce CO of each ton of sinter 2 The discharge amount was reduced by 2.43kg.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. The method for gasifying and dephosphorizing the final slag of the converter and recycling the dephosphorized slag is characterized by comprising the following steps of:
(1) After the converter smelting is completed and tapping is carried out, the steel slag is completely left in the converter;
(2) Taking a steel slag sample, analyzing steel slag components, and according to steel slag FeO and P in a converter 2 O 5 The MnO content and the fixed carbon content of the carbonaceous dephosphorizing agent are calculated, and the required dosage of the carbonaceous dephosphorizing agent is calculated;
(3) Adding a carbonaceous dephosphorizing agent into the converter at one time by a high-level bin to carry out gasification dephosphorization;
(4) Lowering the spray gun to the slag adjusting gun position, and carrying out top-bottom combined blowing of nitrogen in the whole process to stir the steel slag in the furnace so as to fully contact the carbonaceous dephosphorizing agent with the steel slag;
(5) Pouring out 1/2-3/4 dephosphorization slag after dephosphorization of the steel slag is finished; the dumped dephosphorization slag can be recycled to the sintering process;
(6) Lifting the spray gun to a slag splashing furnace protection gun position, and performing slag splashing furnace protection operation;
(7) After the slag splashing protection is finished, the residual dephosphorization slag is completely remained in the furnace for smelting of the next furnace.
2. The method for gasifying and dephosphorizing converter final slag according to claim 1, wherein the carbonaceous dephosphorizing agent is semi-coke.
3. The method for gasifying and dephosphorizing converter final slag according to claim 2, wherein the fixed carbon content of the semi coke is 78-86%.
4. The method for gasifying and dephosphorizing converter final slag according to claim 2, wherein the amount of semi coke is calculated according to the following formula:
；
wherein: w (C): adding amount of semi coke, kg;
w (slag): the weight of steel slag in the converter, kg;
W(P 2 O 5 % of the following: steel slag P 2 O 5 Content,%;
w (FeO%): steel slag FeO content,%;
w (MnO%): the MnO content of steel slag,%;
a: fixed carbon content of semi coke.
5. The method for gasifying and dephosphorizing converter final slag according to claim 2, wherein the granularity of the semi coke is 0.1-8 mm.
6. The method for gasifying and dephosphorizing converter final slag according to claim 1, wherein the gasifying and dephosphorizing process in the step (3) lasts 20-40 min.
7. The method for gasifying and dephosphorizing converter final slag according to claim 1, wherein the gasification dephosphorization rate is 50-65%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311797203.3A CN117778669A (en) | 2023-12-26 | 2023-12-26 | Method for gasifying dephosphorization and recycling dephosphorization slag of converter final slag |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311797203.3A CN117778669A (en) | 2023-12-26 | 2023-12-26 | Method for gasifying dephosphorization and recycling dephosphorization slag of converter final slag |
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| CN117778669A true CN117778669A (en) | 2024-03-29 |
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| Country | Link |
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2023
- 2023-12-26 CN CN202311797203.3A patent/CN117778669A/en active Pending
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