CN110724784A - Low-silicon high-phosphorus molten iron converter smelting method - Google Patents
Low-silicon high-phosphorus molten iron converter smelting method Download PDFInfo
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- CN110724784A CN110724784A CN201910970753.8A CN201910970753A CN110724784A CN 110724784 A CN110724784 A CN 110724784A CN 201910970753 A CN201910970753 A CN 201910970753A CN 110724784 A CN110724784 A CN 110724784A
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- lance
- slag
- molten iron
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- 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
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- 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
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- Manufacturing & Machinery (AREA)
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- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention relates to the technical field of metallurgy, in particular to a low-silicon high-phosphorus molten iron converter smelting method, which comprises the following operations: after the converter is ignited successfully, lowering the lance position of the oxygen lance to a basic lance position of 1.3m, adding a first batch of slag, wherein the first batch of slag comprises 2/3 of the total amount of active lime, all light-burned dolomite, all silica and sintered ore, the active lime is added according to the slag alkalinity controlled at 2.6-3.0, the silica is added according to the equivalent amount of 0.35 percent of silicon contained in molten iron, and the sintered ore is added according to the amount of 500kg per furnace; the oxygen lance is controlled by a variable lance pressure method, the early lance position is 1.3m, and the flow rate is 24000m 3/h; the lance position in the process is 1.4-1.5m, the slagging lance position is 1.7-1.8m, and the oxygen flow is 22000m 3/h; the position of a late carbon drawing gun is 1.1m, and the flow rate is 24000m 3/h; the end point carbon is reduced to 0.08 percent, and 100-200kg of sintering ore is added one minute before the lance is lifted. The process method provided by the invention has low cost, can promote slag melting of the converter and improve dephosphorization efficiency, controls the end point phosphorus to be less than or equal to 0.20%, and reduces the problems of gun return and flue sticking.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a low-silicon high-phosphorus molten iron converter smelting method.
Background
The smelting of the low-silicon molten iron can obviously reduce the coke ratio of the blast furnace and improve the yield of the blast furnace, and the molten iron silicon of the blast furnace is generally controlled to be 0.1-0.2%; meanwhile, the converter can reduce lime consumption and iron loss in slag, so that a plurality of domestic blast furnaces are promoted to adopt a low-silicon molten iron smelting scheme; in the later industrial era, the country promotes short-flow steelmaking by electric furnaces, and newly enters a plurality of electric furnace steel plants, the price of scrap steel is 350 yuan/ton higher than that of molten iron, and the smelting of low-silicon molten iron can reduce the scrap steel ratio and the production cost. Meanwhile, in order to reduce the production cost, a certain proportion of steel slag fine powder is added in the blast furnace during sintering ore blending, so that the molten iron has high phosphorus (more than or equal to 0.17 percent) and the low-silicon molten iron has less slag and high alkalinity during blowing, the process returns to dry and sticks a gun and a flue seriously, the dephosphorization rate is low, the end point phosphorus is high, and waste products with high phosphorus often appear. The existing blowing scheme of low-silicon high-phosphorus molten iron generally adopts a method of adding ferrosilicon into a converter, increasing the silicon content of the molten iron, reducing the alkalinity and melting point of slag and promoting slag melting, wherein the adding of the ferrosilicon into the converter is equivalent to the increasing of the silicon content of the molten iron, but the price of ferrosilicon alloy is 6500 yuan/ton, and when the silicon content of the molten iron is increased by 0.1%, 1.3kg/t of the ferrosilicon needs to be added, so that the cost is increased by 9 yuan; the silicon content of molten iron is high, chemical heat in the furnace is redundant, waste steel consumption is inevitably increased, and smelting cost is further increased.
Disclosure of Invention
The invention aims to solve the technical problem of providing a low-silicon high-phosphorus molten iron converter smelting method which has low cost, can promote slagging and dephosphorization, and reduces the problems of dry return, gun sticking and flue sticking in the smelting process.
The invention is realized by the following technical scheme:
a low-silicon high-phosphorus molten iron converter smelting method comprises the following operations:
after the converter is ignited successfully, the lance position of the oxygen lance is lowered to 1.3m of the basic lance position, and a first batch of slag is added immediately, wherein the first batch of slag comprises 2/3 of the total amount of active lime, all of light-burned dolomite and silica and sinter which are added, wherein the active lime is added according to the control of the alkalinity of the slag at 2.6-3.0, and the addition amount of the light-burned dolomite is equal to the slag amount multiplied by the target magnesia content in the slag divided by the magnesia content in the dolomite; silica is added according to the equivalent proportion of 0.35 percent of silicon contained in molten iron, the sintered ore is added according to the proportion of 500kg per furnace by 300-;
after the first batch is opened, the oxygen lance is raised to 1.4 meters, and a second batch, namely the residual 1/3 active lime is added immediately;
the oxygen lance is controlled by a variable lance pressure method, the early lance position is 1.3m, and the flow rate is 24000m 3/h; the lance position in the process is 1.4-1.5m, the slagging lance position is 1.7-1.8m, and the oxygen flow is 22000m 3/h; the position of a late carbon drawing gun is 1.1m, and the flow rate is 24000m 3/h;
after the flame at the converter mouth is contracted, the lance is lowered to pull carbon, the end point carbon is reduced to about 0.08%, and 100-200kg of sinter (or ore) is added one minute before the lance is lifted.
Optimally, silica is added according to the adding amount of (0.35% -molten iron Si%) multiplied by 2.14 multiplied by 1000 multiplied by molten iron.
Preferably, the total amount of lime is added as (2.14 × R × 0.35% × 1000 × amount of molten iron) ÷ CaO% (effective), where R is the basicity of the slag.
Advantageous effects of the invention
The smelting method of the low-silicon high-phosphorus molten iron converter is adopted for smelting, the alkalinity of the slag is kept between 2.6 and 3.0, the melting point of the slag is low, and the process is easy to melt the slag;
the variable-gun and variable-pressure operation is adopted, so that the slagging is further promoted, the return drying is prevented in the middle period, the slagging in the whole process is good, and the gun sticking and the flue sticking are avoided;
the silica is added according to the equivalent proportion of 0.35 percent of silicon contained in the molten iron, the slag amount is increased to 60-70kg/t, the dephosphorization rate of the converter is improved, high-phosphorus waste products are avoided, and the cost is lower.
Detailed Description
A low-silicon high-phosphorus molten iron converter smelting method comprises the following operations:
after the converter is ignited successfully, the lance position of the oxygen lance is lowered to 1.3m of the basic lance position, and a first batch of slag is added immediately, wherein the first batch of slag comprises 2/3 of the total amount of active lime, all of light-burned dolomite and silica and sinter which are added, wherein the active lime is added according to the control of the alkalinity of the slag at 2.6-3.0, and the addition amount of the light-burned dolomite is equal to the slag amount multiplied by the target magnesia content in the slag divided by the magnesia content in the dolomite; silica is added according to 0.35 percent of silicon contained in molten iron, 500kg of sintered ore is added per furnace according to 300-fold sand, the slag melting is promoted by using the jet flow stirring action of oxygen, the proper slag alkalinity is controlled, the enough slag amount is ensured, and 500kg of the 300-fold sand sintered ore is added in the first batch of slag material, so that the oxidability of the slag is increased, and the slag melting of the converter is further promoted;
after the oxygen lance adopts the first batch to open slag, the oxygen lance is raised to 1.4 meters, and the second batch, namely the residual 1/3 active lime, is added immediately;
the process gun position is controlled by a variable gun pressure method, the early gun position is 1.3m, and the flow rate is 24000m 3/h; the lance position in the process is 1.4-1.5m, the slagging lance position is 1.7-1.8m, and the oxygen flow is 22000m 3/h; the position of a late carbon drawing gun is 1.1m, and the flow rate is 24000m 3/h; the basic gun position of the gun position in the process is improved by 10-20cm (the normal basic gun position is 1.3m, and the low-silicon molten iron is blown by 1.4-1.5m) compared with the normal silicon content (more than or equal to 0.3%) of molten iron, the gun is lifted immediately after slag is opened in the early stage, the gun is lowered to the basic gun position after slag is melted, the dynamic adjustment and the slag melting in the whole process are carried out, the slag forming way of the high-iron oxide is further realized, and the phenomenon that the slag is dried back, sticks to the gun and sticks to a flue is avoided.
After the flame at the converter mouth is contracted, the lance is lowered to pull carbon, the end point carbon is reduced to about 0.08%, and 100-200kg of sinter (or ore) is added one minute before the lance is lifted. Further increasing the oxidability of the slag and improving the dephosphorization rate.
Optimally, silica is added according to the (0.35% -molten iron Si%) multiplied by 2.14 multiplied by 1000 multiplied by the adding amount of molten iron, and the slag alkalinity and the slag amount are further accurately controlled.
Optimally, the total amount of lime is added according to the division of (2.14 multiplied by R multiplied by 0.35 percent multiplied by 1000 multiplied by the amount of the molten iron) ÷ CaO%, wherein R is the alkalinity of the slag, and the alkalinity of the slag can be accurately controlled to be kept between 2.6 and 3.0 by controlling the adding amount of the lime.
Because the silica is added according to the Si percent of the molten iron being 0.35 percent in the early stage, the alkalinity and the melting point of the slag are reduced, and the slag melting is promoted; the sintered ore is added in the early stage, so that the iron oxide in the slag is increased, the melting point of the slag is reduced, and early-stage slag opening is promoted; the process is high in lance position and high in ferric oxide slagging way, so that the slag is prevented from drying; 100 kg of sintered ore (or ore) and 200kg of sand are added before the end point lance lifting, so that the oxidability of molten steel and slag is increased, and the dephosphorization rate is improved; the end point carbon is reduced to about 0.08 percent, the oxidability of slag and molten steel is properly increased, the dephosphorization efficiency is improved, and the end point phosphorus is less than or equal to 0.020 percent;
in conclusion, the low-silicon high-phosphorus molten iron converter smelting method protected by the invention has low cost, can promote slagging and dephosphorization, and reduces the problems of gun adhesion and flue adhesion during the smelting process.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A low-silicon high-phosphorus molten iron converter smelting method is characterized by comprising the following operations:
after the converter is ignited successfully, the lance position of the oxygen lance is lowered to 1.3m of the basic lance position, and a first batch of slag is added immediately, wherein the first batch of slag comprises 2/3 of the total amount of active lime, all of light-burned dolomite and silica and sinter which are added, wherein the active lime is added according to the control of the alkalinity of the slag at 2.6-3.0, and the addition amount of the light-burned dolomite is equal to the slag amount multiplied by the target magnesia content in the slag divided by the magnesia content in the dolomite; silica is added according to the equivalent proportion of 0.35 percent of silicon contained in molten iron, the sintered ore is added according to the proportion of 500kg per furnace by 300-;
after the first batch is opened, the oxygen lance is raised to 1.4 meters, and a second batch, namely the residual 1/3 active lime is added immediately;
the oxygen lance is controlled by a variable lance pressure method, the early lance position is 1.3m, and the flow rate is 24000m 3/h; the lance position in the process is 1.4-1.5m, the slagging lance position is 1.7-1.8m, and the oxygen flow is 22000m 3/h; the position of a late carbon drawing gun is 1.1m, and the flow rate is 24000m 3/h;
after the flame at the converter mouth is contracted, the lance is lowered to pull carbon, the end point carbon is reduced to about 0.08%, and 100-200kg of sintering ore is added one minute before the lance is lifted.
2. The converter smelting method of low-silicon high-phosphorus molten iron according to claim 1, wherein the silica is added according to the adding amount of (0.35% -molten iron Si%) × 2.14 × 1000 × molten iron.
3. The method of claim 1, wherein the total amount of lime is added as (2.14 xr x 0.35% × 1000 × amount of molten iron) ÷ effective calcium oxide content of lime, where R is the basicity of the slag.
4. The converter smelting method of low-silicon high-phosphorus molten iron according to claim 1, wherein the process adopts variable-gun pressure-changing operation, the gun is lifted to the position of a slagging gun in the middle period for slagging, and drying is avoided; after slagging is finished, the lance is lowered to 1.4m and is dynamically controlled according to the conditions of the flame and the slag sheets at the furnace mouth.
5. The method for smelting a low-silicon high-phosphorus molten iron by a converter as claimed in claim 1, wherein the end point carbon is controlled to be about 0.08%, 100-200kg of sintering ore is added 1 minute before lance lifting to increase the oxidability of slag and improve the dephosphorization efficiency.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111560558A (en) * | 2020-06-29 | 2020-08-21 | 盐城市联鑫钢铁有限公司 | Process method for reducing steelmaking cost by converting molten iron into molten steel |
| CN112280924A (en) * | 2020-10-10 | 2021-01-29 | 山东莱钢永锋钢铁有限公司 | Method for controlling temperature in converter smelting |
| CN112322822A (en) * | 2020-10-16 | 2021-02-05 | 包头钢铁（集团）有限责任公司 | Converter single slag smelting method for low-silicon high-phosphorus molten iron |
| CN115323100A (en) * | 2022-07-29 | 2022-11-11 | 鞍钢股份有限公司 | Method for reducing slag adhesion of oxygen lance in converter smelting |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111560558A (en) * | 2020-06-29 | 2020-08-21 | 盐城市联鑫钢铁有限公司 | Process method for reducing steelmaking cost by converting molten iron into molten steel |
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| CN112280924B (en) * | 2020-10-10 | 2022-03-08 | 山东莱钢永锋钢铁有限公司 | Method for controlling temperature in converter smelting |
| CN112322822A (en) * | 2020-10-16 | 2021-02-05 | 包头钢铁（集团）有限责任公司 | Converter single slag smelting method for low-silicon high-phosphorus molten iron |
| CN115323100A (en) * | 2022-07-29 | 2022-11-11 | 鞍钢股份有限公司 | Method for reducing slag adhesion of oxygen lance in converter smelting |
| CN115323100B (en) * | 2022-07-29 | 2023-07-14 | 鞍钢股份有限公司 | Method for reducing slag sticking of oxygen lance in converter smelting |
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