CN112877496B - A method for achieving efficient dephosphorization during the dephosphorization period by controlling the phase of the slag forming process - Google Patents
A method for achieving efficient dephosphorization during the dephosphorization period by controlling the phase of the slag forming process Download PDFInfo
- Publication number
- CN112877496B CN112877496B CN202110048115.8A CN202110048115A CN112877496B CN 112877496 B CN112877496 B CN 112877496B CN 202110048115 A CN202110048115 A CN 202110048115A CN 112877496 B CN112877496 B CN 112877496B
- Authority
- CN
- China
- Prior art keywords
- dephosphorization
- slag
- steel
- converter
- oxygen supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
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
-
- 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
- C21C5/30—Regulating or controlling the blowing
-
- 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
本发明公开了一种通过控制成渣过程物相实现脱磷期高效脱磷的方法，属于转炉炼钢技术领域。本发明通过控制成渣过程中液相(主要为FeO和Ca3Fe2O5)和固相(主要为2CaO·SiO2，2CaO·SiO2‑3CaO·P2O5)的种类、尺寸以及不同时时间下固液相比例，所述的2CaO·SiO2固相的尺寸≤5μm，2CaO·SiO2‑3CaO·P2O5固相的尺寸≤50μm。本发明的控制方法有效提高脱磷期脱磷效率，使得脱磷时间≤5min，脱磷率≥75％，并有效降低原辅料加入量和生产成本。
The invention discloses a method for realizing efficient dephosphorization in the dephosphorization period by controlling the physical phase of the slag forming process, and belongs to the technical field of converter steelmaking. The invention controls the type, size and solid-liquid ratio of the liquid phase (mainly FeO and Ca 3 Fe 2 O 5 ) and the solid phase (mainly 2CaO·SiO 2 , 2CaO·SiO 2 ‑3CaO·P 2 O 5 ) in the slag forming process, and the size of the 2CaO·SiO 2 solid phase is ≤5μm, and the size of the 2CaO·SiO 2 ‑3CaO·P 2 O 5 solid phase is ≤50μm. The control method of the invention effectively improves the dephosphorization efficiency in the dephosphorization period, so that the dephosphorization time is ≤5min, the dephosphorization rate is ≥75%, and the amount of raw and auxiliary materials added and the production cost are effectively reduced.
Description
Technical Field
The invention relates to the technical field of converter steelmaking, in particular to a method for realizing efficient dephosphorization in a dephosphorization period by controlling a slag forming process phase.
Background
Phosphorus is generally considered as a harmful element in steel, and causes a series of problems such as "cold shortness" and a sharp drop in low-temperature toughness of steel. Therefore, one of the main efforts in steelmaking is to remove phosphorus in an economically efficient manner. In 2018, the crude steel yield of China is about 9 hundred million tons, for dephosphorization, the produced slag is about 9000 ten thousand tons (average about 100kg/t steel), more than 4500 ten thousand tons of lime is consumed, and dephosphorization slag is difficult to recycle, so that the problems of great resource waste and environmental pollution are caused.
In recent years, with the increasing competition among iron and steel enterprises and the increasing emphasis of national environmental protection, in order to reduce production cost and reduce pollution to the environment, iron and steel enterprises at home and abroad start to adopt a double-slag and slag-remaining smelting process for production successively, and the process not only can reduce raw and auxiliary material consumption and production cost, but also can reduce slag discharge, and has the advantages of economy and environmental protection. The process divides the traditional converter smelting into two stages, wherein the first stage is mainly used for dephosphorization, deslagging is carried out after dephosphorization is finished, then the second stage smelting is carried out, tapping is carried out after smelting is finished, decarburization slag is recycled to the next furnace for use, and the realization of efficient dephosphorization in the dephosphorization period is the key of the process.
In order to solve the high-efficiency dephosphorization problem in the dephosphorization period, chinese patent CN103243192A discloses a converter smelting method for rapidly and efficiently dephosphorizing dephosphorization slag with lower alkalinity, and the dephosphorization is realized mainly by low gun position, high oxygen supply strength and batch addition of iron ore, but the following problems (1) the dephosphorization rate in the dephosphorization period is not high; (2) The iron content in the slag is high due to the adoption of low gun position and high flow operation, so that the production cost is increased. Chinese patent CN102618689a discloses a "process technology method for producing ultra-low phosphorus molten steel by high-efficiency low-cost converter", which mainly increases dephosphorization rate by prolonging preliminary converting time, but reduces production efficiency.
Therefore, the existing patent mainly improves the dephosphorization rate by adjusting an oxygen lance or prolonging blowing time, has the defects of low dephosphorization efficiency, influence on production rhythm and the like, and needs to be further improved.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to solve the problem of lower dephosphorization rate in the dephosphorization period of the double slag and residual slag smelting process of the existing converter, provides a method for realizing high-efficiency dephosphorization in the dephosphorization period by controlling the phase of a slag forming process, controls each process in the dephosphorization period in the double slag and residual slag smelting process, the oxygen supply amount, the oxygen supply intensity and the lime addition amount in the dephosphorization period are controlled, so that the types, the proportions and the sizes of the intermediate phases of the slag formation in the dephosphorization process are controlled, and the dephosphorization efficiency in the dephosphorization period is effectively improved.
2. Technical proposal
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
the invention relates to a method for realizing efficient dephosphorization in a dephosphorization period by controlling a slag forming process phase, which comprises the following steps:
Step a, controlling the slag remaining amount of the upper furnace to be 50-80 kg/ton of steel;
Step b, the weight percentage of the raw materials added with the metal main material is 80-91% of molten iron, and the balance is scrap steel;
step c, adding iron oxide into the converter before converting, wherein the addition amount of the iron oxide is 20-45kg/t steel;
Step d, converter converting dephosphorization, wherein the oxygen supply amount in the dephosphorization period is 22% -28% of the total oxygen supply amount of smelting furnace time, low gun position operation is adopted, and the oxygen supply intensity is controlled to be 3.0-3.5 Nm 3/min/ton of steel; lime is not added when w Si is less than or equal to 0.4% in molten iron in the dephosphorization period of the converter; when the weight of the lime in molten iron is less than 0.4 percent and less than or equal to 0.7 percent, the lime is added in an amount of 3-5 kg/ton of steel; when the weight of lime in molten iron is less than 0.7% and less than w Si, the lime is added in an amount of 6-10 kg/ton steel;
E, deslagging after the dephosphorization period is finished, and controlling the deslagging amount to be more than or equal to 60%;
Step f, converting and decarbonizing the converter, wherein the oxygen supply amount in the decarbonizing period of the converter is 72-78% of the total oxygen supply amount of the smelting furnace, and the oxygen supply intensity is controlled to be 3.0-3.5 Nm 3/min/ton of steel; lime is added in an amount of 10-20 kg/ton of steel, and light burned dolomite is added in an amount of 5-10 kg/ton of steel; the binary alkalinity of the converter decarbonization slag is 3.0-4.0; the mass fraction of MgO in the slag is 7.0-10.0%;
And g, tapping after blowing of the converter is finished, and reserving slag for splashing slag and protecting the converter.
Preferably, when the total oxygen supply of converter converting dephosphorization is 0% -10%, the lime addition is controlled to be 10% -30%, and the solid phase proportion in slag is 0-20%; when the oxygen supply is 11% -17%, the lime addition is controlled to be 30% -40%, and the solid phase proportion in the slag is 21-32%; when the oxygen supply is more than 17%, the lime addition is controlled to be 40-60%, and the solid phase proportion in the slag is more than 32%.
Preferably, the binary alkalinity of slag in the converting dephosphorization period of the converter is 1.2-1.8, and the slag forming process is liquid phase-solid phase; the temperature of the molten pool is 1330-1400 ℃.
Preferably, the liquid phase in the slag in the converter converting dephosphorization period is mainly FeO and Ca 3Fe2O5, and the solid phase is mainly 2CaO.SiO 2,2CaO·SiO2-3CaO·P2O5.
Preferably, the size of 2 CaO.SiO 2 solid phase in slag in the converter converting dephosphorization period is less than or equal to 5 mu m, and the size of 2 CaO.SiO 2-3CaO·P2O5 solid phase is less than or equal to 50 mu m.
Preferably, in the step c, the iron oxide is iron scale, ore or sinter, and the FeO content is more than or equal to 90%.
Preferably, in the converting dephosphorization period of the step d, the low lance position is H 0+H0*(0.05～0.18),H0 which is the height of the molten steel surface in the converter.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) According to the method for realizing the efficient dephosphorization in the dephosphorization period by controlling the slag forming process phase, each process in the dephosphorization period in the double slag and slag reserving smelting process is controlled, and the oxygen supply amount, the oxygen supply strength and the lime addition amount in the dephosphorization period are controlled, so that the type, the proportion and the size of the slag forming process phase are controlled in the dephosphorization process, the dephosphorization efficiency in the dephosphorization period is effectively improved, the dephosphorization time is less than or equal to 5min, and the dephosphorization rate is more than or equal to 75%;
(2) According to the method for realizing high-efficiency dephosphorization in the dephosphorization period by controlling the slag forming process phase, oxygen is supplied by adopting a low gun position in the dephosphorization period, and meanwhile, lime with corresponding amount is added according to different silicon contents in molten iron; in addition, in the whole dephosphorization period, the lime adding amount is controlled according to the injected oxygen supply amount, so that 2CaO.SiO 2 in the whole process is gradually formed, and the size of a solid phase in slag is controlled, so that phosphorus in molten iron is convenient to enter the solid phase, and a good dephosphorization effect is achieved;
(3) According to the method for realizing the efficient dephosphorization in the dephosphorization period by controlling the slag forming process phase, in order to further control the generation of solid phase in slag, the binary alkalinity of slag in the converter converting dephosphorization period is controlled to be 1.2-1.8, and the temperature of a molten pool is further controlled to be 1330-1400 ℃, so that the generation of 2 CaO-SiO 2,2CaO·SiO2-3CaO·P2O5 solid phase in the slag is favorably controlled, and the size of the solid phase in the slag is further controlled, so that the dephosphorization time can be effectively shortened, and the dephosphorization effect is improved;
(4) According to the method for realizing high-efficiency dephosphorization in the dephosphorization period by controlling the slag forming process phase, in the dephosphorization period, the gun position is always controlled to be at a low gun position, and the whole molten pool can be stirred in the process of oxygen injection, so that the FeO content in slag can be rapidly reduced; meanwhile, due to the existence of disturbance, the oxygen supply intensity of the injected oxygen is controlled to a certain extent, so that the generated 2 CaO/SiO 2 is more in quantity and small in size, and the dephosphorization effect is improved.
Drawings
FIG. 1 shows the appearance of slag when the oxygen supply amount was 9% in example 1 of the present invention.
Detailed Description
For a further understanding of the present invention, the present invention will be described in detail with reference to the drawings and examples.
Example 1
The method for realizing high-efficiency dephosphorization in the dephosphorization period by controlling the phase of the slag forming process is carried out on a 150-ton converter, and the experimental process is a smelting process of double slag and remained slag, and comprises the following specific steps:
(a) After the blowing of the previous furnace is finished, controlling the slag remaining to be 54kg/t steel, and splashing slag to solidify the slag;
(b) Adding scrap steel into a converter, adding molten iron, and controlling the mass percent of the scrap steel to be as follows: 90.2% of molten iron and 9.8% of scrap steel, and the concrete is shown in table 1;
(c) Before the converter is opened and blown, 25kg/t of steel ore is added, and the FeO content is more than or equal to 90 percent;
(d) Converter blowing dephosphorization, and determining the lime addition amount in the dephosphorization period of the converter according to the condition of molten iron entering the converter, wherein the lime addition amount is 0kg/t steel as w [ Si ] in the molten iron of the embodiment is less than or equal to 0.4%, and the concrete addition amount is shown in Table 2;
The oxygen supply amount in the dephosphorization period is 24% of the total oxygen supply amount of smelting furnace, the liquid level of a molten pool is 1.5m, the gun position is controlled to be 1.65m, the oxygen supply intensity is controlled to be 3.2Nm 3/min/ton of steel, and the alkalinity in slag is controlled to be 1.29;
(e) Pouring slag after the dephosphorization period is finished, and controlling the slag pouring amount to be 65%; the conditions of slag and molten iron in the dephosphorization period are shown in Table 3;
(f) Blowing and decarbonizing in a converter, wherein the oxygen supply amount in the decarbonizing period of the converter is 76% of the total oxygen supply amount of smelting furnace times, the oxygen supply intensity is controlled to be 3.5Nm 3/min/ton of steel, the lime addition amount is controlled to be 18.3 kg/ton of steel, and the light burned dolomite addition amount is controlled to be 7.5 kg/ton of steel; the smelting index of the converter is shown in table 4;
(g) Tapping after blowing of the converter is finished, and reserving slag for slag splashing and furnace protection.
Table 1 conditions of the metal charge in the smelting furnace of the converter
Table 2 technological parameters of converter converting desilication and dephosphorization period
TABLE 3 dephosphorization stage slag and molten iron conditions
Table 4 converter smelting index
In addition, it is noted that the slag morphology of this example at 9% oxygen supply during dephosphorization can be seen from FIG. 1 that the size of the 2 CaO. SiO 2 solid phase produced is 5 μm or less and the size of the 2 CaO. SiO 2-3CaO·P2O5 solid phase is 50 μm or less.
Compared with the process of double slag and residual slag in the comparative example, the method has the advantages of shortening dephosphorization time, reducing converter lime consumption, steel material consumption and terminal molten steel phosphorus content, and greatly improving dephosphorization rate in dephosphorization period, wherein the dephosphorization time is shortened by 1min, the consumption of lime is reduced by 9kg// t steel, the dephosphorization rate in dephosphorization period is improved from 57.69% to 76.15%, the dephosphorization rate is improved by 18.46%, the terminal phosphorus content is reduced by 0.013%, and the steel material consumption is reduced by 4kg/t steel.
Example 2
The method for realizing high-efficiency dephosphorization in the dephosphorization period by controlling the phase of the slag forming process is carried out on a 150-ton converter, and the experimental process is a smelting process of double slag and remained slag, and comprises the following specific steps:
(a) After the blowing of the previous furnace is finished, controlling the slag remaining to be 72kg/t steel, and splashing slag to solidify the slag;
(b) Adding scrap steel into a converter, adding molten iron, and controlling the mass percent of the scrap steel to be as follows: 85.3% of molten iron, 14.7% of scrap steel and a specific table 1;
(c) 34kg/t of steel oxide scale is added before the converter is opened and blown, and the FeO content is more than or equal to 90 percent;
(d) Converter blowing dephosphorization, and determining the lime addition amount in the dephosphorization period of the converter according to the condition of molten iron entering the converter, wherein the lime addition amount is 0kg/t steel as w [ Si ] in the molten iron of the embodiment is less than or equal to 0.4%, and the concrete addition amount is shown in Table 2;
the oxygen supply amount in the dephosphorization period is 26% of the total oxygen supply amount of smelting furnace, the liquid level of a molten pool is 1.5m, the gun position is controlled to be 1.69m, the oxygen supply intensity is controlled to be 3.1Nm 3/min/ton of steel, and the alkalinity in slag is controlled to be 1.35;
(e) Pouring slag after the dephosphorization period is finished, and controlling the slag pouring amount to be 63%; the conditions of slag and molten iron in the dephosphorization period are shown in Table 3;
(f) Blowing and decarbonizing in a converter, wherein the oxygen supply amount in the decarbonizing period of the converter is 74 percent of the total oxygen supply amount of smelting furnace times, the oxygen supply intensity is controlled to be 3.5Nm 3/min/ton of steel, the lime addition amount is controlled to be 19.4 kg/ton of steel, and the light burned dolomite addition amount is controlled to be 7.9 kg/ton of steel; the smelting index of the converter is shown in table 4;
(g) Tapping after blowing of the converter is finished, and reserving slag for slag splashing and furnace protection.
Compared with the process of double slag and slag remaining in the comparative example, the method has the advantages of shortening dephosphorization time, reducing converter lime consumption, steel material consumption and terminal molten steel phosphorus content, greatly improving dephosphorization rate in dephosphorization period, wherein the dephosphorization time is shortened by 0.7min, the lime consumption is reduced by 7.9kg// t steel, the dephosphorization rate in dephosphorization period is improved from 57.69% to 80.67%, the dephosphorization rate is improved by 22.98%, the terminal phosphorus content is reduced by 0.014%, and the steel material consumption is reduced by 4kg/t steel.
Example 3
The method for realizing high-efficiency dephosphorization in the dephosphorization period by controlling the phase of the slag forming process is carried out on a 150-ton converter, and the experimental process is a smelting process of double slag and remained slag, and comprises the following specific steps:
(a) After the blowing of the previous furnace is finished, controlling the slag remaining to be 68kg/t steel, and splashing slag to solidify the slag;
(b) Adding scrap steel into a converter, adding molten iron, and controlling the mass percent of the scrap steel to be as follows: 89.8% of molten iron and 10.2% of scrap steel, and the concrete is shown in table 1;
(c) Before the converter is opened and blown, 36kg/t of steel sinter is added, and the FeO content is more than or equal to 90 percent;
(d) Converter blowing dephosphorization, and determining the lime addition amount in the dephosphorization period of the converter according to the molten iron feeding condition, wherein the lime addition amount is preferably 3.5kg/t steel because w Si is more than 0.4 and less than or equal to 0.7% in the molten iron of the embodiment, and the concrete addition amount is shown in Table 2;
the oxygen supply amount in the dephosphorization period is 24% of the total oxygen supply amount of smelting furnace, the liquid level of a molten pool is 1.5m, the gun position is controlled to be 1.70m, the oxygen supply intensity is controlled to be 3.1Nm 3/min/ton of steel, and the alkalinity in slag is controlled to be 1.69;
It is worth to say that the lime addition amount in the dephosphorization period of the embodiment is controlled, and when the oxygen supply amount reaches 9%, the lime addition amount is 1.0kg/t steel; when the oxygen supply reaches 15% from 9%, the lime addition amount is 1.4kg/t steel; when the oxygen supply reaches 24% from 15%, the lime is added in an amount of 1.1kg/t steel. The research shows that in the whole dephosphorization period, lime is continuously added in stages, and simultaneously the low gun position, the binary alkalinity, the temperature and the oxygen supply strength are controlled, so that the generated 2 CaO-SiO 2 is gradually more in quantity and small in size, and the dephosphorization effect is improved. If the addition amount of lime is too large in each stage, the particle size of the generated 2CaO.SiO 2 is larger, and the dephosphorization effect is reduced.
In addition, the research shows that in the whole dephosphorization period, when the total oxygen supply is 0% -10%, the lime addition is controlled to be 10% -30%, and the solid phase proportion in the slag is 0-20%; when the oxygen supply is 11% -17%, the lime addition is controlled to be 30% -40%, and the solid phase proportion in the slag is 21-32%; when the oxygen supply is more than 17%, the lime addition is controlled to be 40-60%, the solid phase proportion in the slag is more than 32%, and the dephosphorization effect is better.
(E) Pouring slag after the dephosphorization period is finished, and controlling the slag pouring amount to be 70%; the conditions of slag and molten iron in the dephosphorization period are shown in Table 3;
(f) Blowing and decarbonizing in a converter, wherein the oxygen supply amount in the decarbonizing period of the converter is 76% of the total oxygen supply amount of smelting furnace times, the oxygen supply intensity is controlled to be 3.5Nm 3/min/ton of steel, the lime addition amount is controlled to be 18.0 kg/ton of steel, and the light burned dolomite addition amount is controlled to be 6.8 kg/ton of steel; the smelting index of the converter is shown in table 4;
(g) Tapping after blowing of the converter is finished, and reserving slag for slag splashing and furnace protection.
Compared with the process of double slag and slag remaining in the comparative example, the method has the advantages of shortening dephosphorization time, reducing converter lime consumption, steel material consumption and terminal molten steel phosphorus content, and greatly improving dephosphorization rate in dephosphorization period, wherein the dephosphorization time is shortened by 1min, the lime consumption is reduced by 5.8kg// t steel, the dephosphorization rate in dephosphorization period is improved from 57.69% to 75.00%, the dephosphorization rate is improved by 17.31%, the terminal phosphorus content is reduced by 0.014%, and the steel material consumption is reduced by 3kg/t steel.
Example 4
The method for realizing high-efficiency dephosphorization in the dephosphorization period by controlling the phase of the slag forming process is carried out on a 150-ton converter, and the experimental process is a smelting process of double slag and remained slag, and comprises the following specific steps:
(a) After the blowing of the previous furnace is finished, controlling the slag remaining to be 76kg/t steel, and splashing slag to solidify the slag;
(b) Adding scrap steel into a converter, adding molten iron, and controlling the mass percent of the scrap steel to be as follows: 80.5% of molten iron and 19.5% of scrap steel, and the concrete is shown in table 1;
(c) 42kg/t of steel ore is added before the converter is opened and blown, and the FeO content is more than or equal to 90 percent;
(d) Converter blowing dephosphorization, and determining the lime addition amount in the dephosphorization period of the converter according to the condition of molten iron entering the converter, wherein the addition amount of the lime is preferably 8.4kg/t steel because w [ Si ] in the molten iron of the embodiment is more than 0.7%, and the concrete addition amount is shown in Table 2;
The oxygen supply amount in the dephosphorization period is 23% of the total oxygen supply amount of smelting furnace, the liquid level of a molten pool is 1.5m, the gun position is controlled to be 1.75m, the oxygen supply intensity is controlled to be 3.1Nm 3/min/ton of steel, and the alkalinity in slag is controlled to be 1.58;
It is worth to say that the lime addition amount in the dephosphorization period of the embodiment is controlled, and when the oxygen supply amount reaches 9%, the lime addition amount is 3.2kg/t steel; when the oxygen supply reaches 15% from 9%, the lime addition amount is 4.0kg/t steel; when the oxygen supply reaches 24% from 15%, the lime is added in an amount of 1.2kg/t steel.
(E) Pouring slag after the dephosphorization period is finished, and controlling the slag pouring amount to be 68%; the conditions of slag and molten iron in the dephosphorization period are shown in Table 3;
(f) Blowing and decarbonizing in a converter, wherein the oxygen supply amount in the decarbonizing period of the converter is 77% of the total oxygen supply amount of smelting furnace times, the oxygen supply intensity is controlled to be 3.5Nm 3/min/ton of steel, the lime addition amount is controlled to be 17.2 kg/ton of steel, and the light burned dolomite addition amount is controlled to be 6.5 kg/ton of steel; the smelting index of the converter is shown in table 4;
(g) Tapping after blowing of the converter is finished, and reserving slag for slag splashing and furnace protection.
Compared with the process of double slag and slag remaining in the comparative example, the method has the advantages of shortening the dephosphorization time, reducing the converter lime consumption, the steel material consumption and the phosphorus content of the final molten steel, greatly improving the dephosphorization rate in the dephosphorization period, shortening the dephosphorization time by 1.2min, reducing the lime consumption by 1.7kg// t steel, improving the dephosphorization rate in the dephosphorization period from 57.69% to 78.46%, improving the dephosphorization rate by 18.46%, reducing the phosphorus content in the final point by 0.012%, and reducing the steel material consumption by 4kg/t steel.
The invention and its embodiments have been described above by way of illustration and not limitation, and the invention is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present invention.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110048115.8A CN112877496B (en) | 2021-01-14 | 2021-01-14 | A method for achieving efficient dephosphorization during the dephosphorization period by controlling the phase of the slag forming process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110048115.8A CN112877496B (en) | 2021-01-14 | 2021-01-14 | A method for achieving efficient dephosphorization during the dephosphorization period by controlling the phase of the slag forming process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112877496A CN112877496A (en) | 2021-06-01 |
| CN112877496B true CN112877496B (en) | 2024-11-22 |
Family
ID=76048447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110048115.8A Active CN112877496B (en) | 2021-01-14 | 2021-01-14 | A method for achieving efficient dephosphorization during the dephosphorization period by controlling the phase of the slag forming process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112877496B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116024399A (en) * | 2021-10-26 | 2023-04-28 | 上海梅山钢铁股份有限公司 | A method for smelting leftover molten steel in a rotary furnace |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109371200A (en) * | 2018-10-29 | 2019-02-22 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Smelting method for rapidly dephosphorizing molten iron by spraying iron oxide red at bottom of converter |
| CN110938726A (en) * | 2018-09-21 | 2020-03-31 | 上海梅山钢铁股份有限公司 | Method for smelting low-phosphorus molten steel by converter |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1046139C (en) * | 1997-10-08 | 1999-11-03 | 冶金工业部钢铁研究总院 | Pre-dephosporizing method for molten iron |
| CN1189575C (en) * | 2003-07-04 | 2005-02-16 | 钢铁研究总院 | Converter steelmaking process |
| CN101298634A (en) * | 2008-06-24 | 2008-11-05 | 西安建筑科技大学 | A pre-melted hot metal pretreatment dephosphorization agent |
| CN101831525B (en) * | 2010-05-19 | 2012-01-25 | 首钢总公司 | Dephosphorization method for molten iron |
| CN102965463B (en) * | 2012-11-21 | 2014-05-28 | 首钢总公司 | Efficient dephosphorization process for converter |
| CN104250672B (en) * | 2014-05-29 | 2016-04-20 | 莱芜钢铁集团有限公司 | A kind of method of combined blown converter high efficiency dephosphorating |
| CN105671248B (en) * | 2016-03-22 | 2018-04-24 | 首钢集团有限公司 | A kind of smelting process of converter high efficiency dephosphorating |
| CN106987683B (en) * | 2017-04-18 | 2019-03-05 | 安徽工业大学 | A kind of high efficiency dephosphorating solid particle additive and the method using solid additive smelting high phosphorus hot metal production Low-phosphorus Steel |
| CN108165705A (en) * | 2017-12-19 | 2018-06-15 | 北京科技大学 | A kind of method of producing ultra-low phosphoretic steel by molten steel dephosphorising outside furnace |
| CN111719032B (en) * | 2019-03-21 | 2021-10-26 | 本钢板材股份有限公司 | Converter less-slag smelting method |
-
2021
- 2021-01-14 CN CN202110048115.8A patent/CN112877496B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110938726A (en) * | 2018-09-21 | 2020-03-31 | 上海梅山钢铁股份有限公司 | Method for smelting low-phosphorus molten steel by converter |
| CN109371200A (en) * | 2018-10-29 | 2019-02-22 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Smelting method for rapidly dephosphorizing molten iron by spraying iron oxide red at bottom of converter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112877496A (en) | 2021-06-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103205524B (en) | Method for smelting low-sulfur steel from semi-steel | |
| CN105525055B (en) | A kind of control method of converter less-slag melting carbon period splash | |
| CN102212643A (en) | Converter less-slag smelting process | |
| CN103498016B (en) | Dephosphorization agent prepared by taking slag of decarbonization furnace as raw material and molten iron dephosphorization method | |
| CN115323099B (en) | Steelmaking method for recycling magnetic separation steel slag by converter | |
| CN110938726A (en) | Method for smelting low-phosphorus molten steel by converter | |
| CN1291657A (en) | Flux and process for forming slag of converter | |
| CN112877496B (en) | A method for achieving efficient dephosphorization during the dephosphorization period by controlling the phase of the slag forming process | |
| CN110699511B (en) | Method for smelting high-silicon molten iron | |
| CN112708717A (en) | Method for smelting low-phosphorus molten steel by single-converter duplex method | |
| CN108754063B (en) | Dephosphorization production process for H08A series steel | |
| CN113088617B (en) | Converter steelmaking method | |
| CN106987683B (en) | A kind of high efficiency dephosphorating solid particle additive and the method using solid additive smelting high phosphorus hot metal production Low-phosphorus Steel | |
| CN109112250B (en) | A kind of semi-steel smelting converter final slag furnace gasification dephosphorization and recycling method | |
| CN112695155A (en) | Steelmaking process of molten iron containing vanadium and titanium | |
| CN1064714C (en) | Method for reforming slags system of smelting steel with low-Si molten iron or semisteel by using slag inclusion of converter as slag modifier | |
| CN115261550B (en) | Converter smelting method of low-silicon molten iron | |
| CN110564908A (en) | double-slag dephosphorization and steel-making method for semisteel converter | |
| CN112899430B (en) | Method for improving energy utilization efficiency of converter | |
| CN112779378A (en) | Low-iron-consumption duplex less-slag smelting method for single converter | |
| CN111218538B (en) | Method for efficiently utilizing high-manganese pig iron | |
| CN112458237B (en) | Steelmaking method for reducing slag quantity and modifying slag components on line | |
| CN119144791B (en) | A refining slag-removing agent, preparation method and smelting method for low-carbon steel wire | |
| CN111304399B (en) | A method of using refining slag for converter smelting | |
| CN116622939A (en) | Smelting method for reducing consumption of converter steel and iron materials |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |