CN112877497A - Smelting control method for converter slag retention double-slag smelting - Google Patents
Smelting control method for converter slag retention double-slag smelting Download PDFInfo
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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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- 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
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills
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Abstract
The invention relates to a smelting control method for converter slag retention double-slag smelting, belonging to the technical field of steel making. The method comprises the steps of pretreating molten iron and steel scrap, carrying out slag retention operation, controlling the effective calcium oxide amount and the light-burned dolomite amount of the front furnace slag, controlling oxygen supply in the early stage of converting, carrying out secondary slagging operation, controlling the lime addition amount and the light-burned dolomite amount of secondary slagging, controlling the oxygen supply of the secondary slagging and obtaining secondary slagging target slag; according to the invention, a nitrogen slagging double-slag smelting method is adopted, so that the phosphorus-containing and high-silicon dioxide slag in the early stage can be effectively removed, the dephosphorization efficiency is improved, the consumption of lime and light-burned dolomite is reduced, the consumption of lime and light-burned dolomite is within 32kg/t, the dephosphorization efficiency of the converter is 90-95%, and the splashing rate is below 1%.
Description
Technical Field
The invention relates to a smelting control method for converter slag retention double-slag smelting, belonging to the technical field of steel making.
Background
The slagging method for converter smelting comprises a single slag method and a double slag method, wherein the double slag method has the advantages that most of furnace slag in the converter can be discharged by slag discharge in the early stage, the aim of removing harmful elements is fulfilled, meanwhile, splashing can be effectively controlled by reducing the amount of the slag, and the loss of metal materials can be reduced. However, the difficulty of slag remaining and double slag smelting is how to accurately calculate the material addition amount in the early stage, which is very important for improving the dephosphorization efficiency, accurately controlling the slag components, discharging the generated slag in a foaming manner and reducing the influence of the slag components on the furnace lining.
In the prior art, the influence of slag components on a furnace lining cannot be effectively reduced due to the lack of accurate calculation of the material addition amount in the early stage.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a smelting control method for converter slag-remaining double-slag smelting, which can accurately calculate the material adding amount in the early stage.
The technical scheme adopted by the invention is as follows: a smelting control method for converter slag retention double-slag smelting comprises the following steps:
the method comprises the following steps: pretreating molten iron and scrap steel: the silicon content of the molten iron is controlled to be 0.25-0.6%, the scrap steel is light broken scrap steel, the length and width of the scrap steel are within 10cm, and the proportion of the molten iron is more than 80%;
step two: carrying out slag remaining operation: the retention proportion of the amount of the front furnace slag is 70-100%, wherein the content of magnesium oxide in the front furnace slag is controlled to be 5-6%;
step three: controlling the effective calcium oxide amount and the light-burned dolomite amount of the front furnace slag: the effective calcium oxide amount = the amount of the slag of the earlier-stage slag (the mass percentage of the calcium oxide of the slag of the front-stage slag-the mass percentage of SiO2 of the slag of the front-stage slag: SiO2 curing coefficient), wherein the binary alkalinity CaO/SiO is 21.2-1.5, the yield of the lime is 0.95, and the calcium oxide content of the lime is 85-95%; the method comprises the following steps of (1) light-burned dolomite amount = early-stage slag amount, early-stage slag magnesium oxide content-front-furnace slag amount, front-furnace slag magnesium oxide content)/light-burned dolomite magnesium oxide content, wherein the light-burned dolomite magnesium oxide content is 30-35%;
step three: controlling oxygen supply at the early stage of blowing: the early-stage oxygen supply flow is 3.5-4.0 m3/t.min, the early-stage oxygen lance position is controlled within 200-220 cm, and the early-stage oxygen supply time is controlled within 4 minutes;
step four: blowing nitrogen and slagging: after oxygen supply of the oxygen lance is stopped, blowing nitrogen into the furnace, wherein the total amount of the supplied gas is 3-4.0 cubic meters per ton of molten iron, the strength of the nitrogen is 3.5-3.8 cubic meters per t.min, and the gas supply time is 40-60 seconds; when nitrogen is blown into the furnace, the height between the oxygen lance nozzle and the molten iron liquid level is 2.0-5.0 m; after the nitrogen supply in the furnace is finished, rapidly reversing the furnace and discharging slag, wherein the final slag discharging angle range is 87-90 degrees;
step five: carrying out secondary slagging operation: performing secondary slagging and normal smelting;
step six: controlling the addition amount of lime for secondary slagging and the amount of light-burned dolomite:
the secondary slagging lime addition = mass of sio2 in the slag after the early-stage slag discharge and target slag final slag alkalinity/calcium oxide content of lime/lime yield;
wherein, the mass of sio2 in the slag after the early slag tapping (= (molten iron amount, molten iron silicon content and scrap steel amount, scrap steel silicon content) = 2.14 (1-slag tapping proportion); the final slag alkalinity of the secondary slagging slag is controlled to be 2.8-3.5, and the magnesium oxide of the secondary slagging slag is controlled to be 5.5-6.5%;
step seven: controlling oxygen supply for secondary slagging: the flow rate of oxygen supply for secondary slagging adopts a control method of early weakening and late stage, the oxygen supply intensity is controlled within 2.5-2.8 m3/t.min within 2 minutes after the secondary slagging is started to be blown, the oxygen supply intensity is controlled within 2.8-3.5 m3/t.min within 2-4 minutes after the secondary slagging is started to be blown, and the oxygen supply intensity is controlled within 3.8-4 m3/t.min after 4 minutes after the secondary slagging is started to be blown;
wherein the lance position of the oxygen lance is controlled to be 190-250 cm, and the lance position is controlled to be 180-190 cm by 10% oxygen content at the blowing end stage;
step eight: obtaining secondary slagging target slag: the final slag alkalinity of secondary slagging target slag is controlled to be 2.8-3.5, the end point temperature is controlled to be 1590-1600 ℃, the mass percentage of dynamic carbon is controlled to be 0.2-0.3%, and the dynamic temperature is controlled to be 1560-1580 ℃;
step nine: and finishing the double-slag smelting.
The scheme is further improved in that: the lime amount = (molten iron amount, molten iron silicon content, 2.14+ scrap steel amount, scrap steel silicon content, 2.14) the early-stage slag target alkalinity/lime calcium oxide content/lime yield-the early-stage furnace slag effective calcium oxide-the early-stage required light-burned dolomite amount, the calcium oxide content of the light-burned dolomite.
The scheme is further improved in that: the pre-slag amount = molten iron amount, molten iron silicon content, 2.14+ scrap steel amount, molten iron manganese content, 72/56+ scrap steel amount, molten iron manganese content, 72/56+ molten iron phosphorus content, 142/62 + early dephosphorization efficiency + (molten iron silicon content, 2.14+ scrap steel amount, molten iron silicon content, 2.14+ molten iron manganese content, 72/56+ scrap steel amount, molten iron manganese content, 72/56+ molten iron phosphorus content, 142/62 + early dephosphorization efficiency), the early-stage total iron content of the slag + pre-slag amount; wherein the content of the total iron in the early-stage slag is 30 percent, and the early-stage dephosphorization efficiency is 55 percent.
The scheme is further improved in that: the amount of the light-burned dolomite added for secondary slagging = (the total amount of the slag after secondary slagging, the target magnesium oxide content of the slag-the slag discharging proportion, the total amount of the slag before slag discharging)/(1-the target magnesium oxide content of the slag);
wherein, the total amount of the slag after secondary slagging = (1-slagging proportion) × the total amount of the slag before slagging + the addition amount of secondary slagging lime, and the total amount of the slag before slagging = the amount of the front slag + the lime amount of the front furnace slag.
The invention has the beneficial effects that: by controlling the content of magnesium oxide in the front furnace slag, controlling the oxygen supply intensity of the current furnace, controlling the binary alkalinity and magnesium oxide content of the front furnace slag, the binary alkalinity and magnesium oxide content of the secondary slagging slag and controlling the proportion of the secondary slagging and slag retention, comprehensively considering factors influencing the slag amount of the furnace slag, accurately calculating the slag amount of the front furnace slag, and further accurately calculating the adding amounts of the front-stage, secondary slagging lime and light-burned dolomite; by adopting a nitrogen slagging double-slag smelting method, phosphorus and high silicon dioxide slag in the early stage can be effectively removed, the dephosphorization efficiency is improved, the consumption of lime and light-burned dolomite is reduced, the consumption of the lime and the light-burned dolomite is within 32kg/t, the dephosphorization efficiency of the converter is 90-95%, and the splashing rate is below 1%.
Detailed Description
Through the description of the embodiments, the detailed implementation of the present invention, such as the mutual positions and connection relationships between the related parts, the functions and operating principles of the parts, the operation and using method, etc., will be further described in detail to help those skilled in the art to more completely, accurately and deeply understand the concept and technical solution of the present invention.
Examples
A smelting control method for converter slag retention double-slag smelting comprises the following steps:
the method comprises the following steps: pretreating molten iron and scrap steel: the silicon content of the molten iron is controlled to be 0.25-0.6%, the scrap steel is light broken scrap steel, the length and width of the scrap steel are within 10cm, and the proportion of the molten iron is more than 80%;
step two: carrying out slag remaining operation: the retention proportion of the amount of the front furnace slag is 70-100%, wherein the content of magnesium oxide in the front furnace slag is controlled to be 5-6%;
step three: controlling the effective calcium oxide amount and the light-burned dolomite amount of the front furnace slag: the effective calcium oxide amount = the amount of the slag of the earlier-stage slag (the mass percentage of the calcium oxide of the slag of the front-stage slag-the mass percentage of SiO2 of the slag of the front-stage slag: SiO2 curing coefficient), wherein the binary alkalinity CaO/SiO is 21.2-1.5, the yield of the lime is 0.95, and the calcium oxide content of the lime is 85-95%; the method comprises the following steps of (1) light-burned dolomite amount = early-stage slag amount, early-stage slag magnesium oxide content-front-furnace slag amount, front-furnace slag magnesium oxide content)/light-burned dolomite magnesium oxide content, wherein the light-burned dolomite magnesium oxide content is 30-35%;
step three: controlling oxygen supply at the early stage of blowing: the early-stage oxygen supply flow is 3.5-4.0 m3/t.min, the early-stage oxygen lance position is controlled within 200-220 cm, and the early-stage oxygen supply time is controlled within 4 minutes;
step four: blowing nitrogen and slagging: after oxygen supply of the oxygen lance is stopped, blowing nitrogen into the furnace, wherein the total amount of the supplied gas is 3-4.0 cubic meters per ton of molten iron, the strength of the nitrogen is 3.5-3.8 cubic meters per t.min, and the gas supply time is 40-60 seconds; when nitrogen is blown into the furnace, the height between the oxygen lance nozzle and the molten iron liquid level is 2.0-5.0 m; after the nitrogen supply in the furnace is finished, rapidly reversing the furnace and discharging slag, wherein the final slag discharging angle range is 87-90 degrees;
step five: carrying out secondary slagging operation: performing secondary slagging and normal smelting;
step six: controlling the addition amount of lime for secondary slagging and the amount of light-burned dolomite:
the secondary slagging lime addition = mass of sio2 in the slag after the early-stage slag discharge and target slag final slag alkalinity/calcium oxide content of lime/lime yield;
wherein, the mass of sio2 in the slag after the early slag tapping (= (molten iron amount, molten iron silicon content and scrap steel amount, scrap steel silicon content) = 2.14 (1-slag tapping proportion); the final slag alkalinity of the secondary slagging slag is controlled to be 2.8-3.5, and the magnesium oxide of the secondary slagging slag is controlled to be 5.5-6.5%;
step seven: controlling oxygen supply for secondary slagging: the flow rate of oxygen supply for secondary slagging adopts a control method of early weakening and late stage, the oxygen supply intensity is controlled within 2.5-2.8 m3/t.min within 2 minutes after the secondary slagging is started to be blown, the oxygen supply intensity is controlled within 2.8-3.5 m3/t.min within 2-4 minutes after the secondary slagging is started to be blown, and the oxygen supply intensity is controlled within 3.8-4 m3/t.min after 4 minutes after the secondary slagging is started to be blown;
wherein the lance position of the oxygen lance is controlled to be 190-250 cm, and the lance position is controlled to be 180-190 cm by 10% oxygen content at the blowing end stage;
step eight: obtaining secondary slagging target slag: the final slag alkalinity of secondary slagging target slag is controlled to be 2.8-3.5, the end point temperature is controlled to be 1590-1600 ℃, the mass percentage of dynamic carbon is controlled to be 0.2-0.3%, and the dynamic temperature is controlled to be 1560-1580 ℃;
step nine: and finishing the double-slag smelting.
Lime amount = (molten iron amount, molten iron silicon content, 2.14+ scrap steel amount, scrap steel silicon content, 2.14) slag target alkalinity at the early stage/lime content/lime yield-effective calcium oxide of the slag in the front furnace-required light-burned dolomite amount at the early stage/calcium oxide content of the light-burned dolomite.
The amount of the pre-slag, the amount of the iron liquid, the amount of the silicon of the steel scrap, 2.14+ the amount of the iron liquid, the amount of the manganese of the iron liquid, 72/56+ the amount of the steel scrap, the amount of the manganese of the steel scrap, 72/56+ the amount of the iron liquid, the amount of the phosphorus of the iron liquid, 142/62 + the amount of the pre-dephosphorization efficiency (the amount of the iron liquid, the amount of the silicon of the iron liquid, 2.14+ the amount of the steel scrap, the amount of the silicon of the steel scrap, 2.14+ the amount of the iron liquid, the amount of the manganese of the iron liquid, 72/56+ the amount of the steel scrap, the amount of the manganese of the steel scrap, the amount of the iron liquid, the amount of the phosphorus of the iron liquid, 72/56+ the amount of the iron liquid, the phosphorus, 142/62 + the amount; wherein the content of the total iron in the early-stage slag is 30 percent, and the early-stage dephosphorization efficiency is 55 percent.
The amount of the light-burned dolomite added for secondary slagging = (the total amount of the slag after secondary slagging, the target magnesium oxide content of the slag-the slag discharging proportion, the total amount of the slag before slag discharging)/(1-the target magnesium oxide content of the slag);
wherein, the total amount of the slag after secondary slagging = (1-slagging proportion) × the total amount of the slag before slagging + the addition amount of secondary slagging lime, and the total amount of the slag before slagging = the amount of the front slag + the lime amount of the front furnace slag.
The present invention is not limited to the above embodiments, and any technical solutions formed by equivalent substitutions fall within the scope of the present invention.
Claims (4)
1. A smelting control method for converter slag retention double-slag smelting is characterized by comprising the following steps:
the method comprises the following steps: pretreating molten iron and scrap steel: the silicon content of the molten iron is controlled to be 0.25-0.6%, the scrap steel is light broken scrap steel, the length and width of the scrap steel are within 10cm, and the proportion of the molten iron is more than 80%;
step two: carrying out slag remaining operation: the retention proportion of the amount of the front furnace slag is 70-100%, wherein the content of magnesium oxide in the front furnace slag is controlled to be 5-6%;
step three: controlling the effective calcium oxide amount and the light-burned dolomite amount of the front furnace slag:
the effective calcium oxide amount = the amount of the slag of the earlier-stage slag (the mass percentage of the calcium oxide of the slag of the front-stage slag-the mass percentage of SiO2 of the slag of the front-stage slag: SiO2 curing coefficient), wherein the binary alkalinity CaO/SiO is 21.2-1.5, the yield of the lime is 0.95, and the calcium oxide content of the lime is 85-95%;
the method comprises the following steps of (1) light-burned dolomite amount = early-stage slag amount, early-stage slag magnesium oxide content-front-furnace slag amount, front-furnace slag magnesium oxide content)/light-burned dolomite magnesium oxide content, wherein the light-burned dolomite magnesium oxide content is 30-35%;
step three: controlling oxygen supply at the early stage of blowing: the early-stage oxygen supply flow is 3.5-4.0 m3/t.min, the early-stage oxygen lance position is controlled within 200-220 cm, and the early-stage oxygen supply time is controlled within 4 minutes;
step four: blowing nitrogen and slagging: after oxygen supply of the oxygen lance is stopped, blowing nitrogen into the furnace, wherein the total amount of the supplied gas is 3-4.0 cubic meters per ton of molten iron, the strength of the nitrogen is 3.5-3.8 cubic meters per t.min, and the gas supply time is 40-60 seconds; when nitrogen is blown into the furnace, the height between the oxygen lance nozzle and the molten iron liquid level is 2.0-5.0 m; after the nitrogen supply in the furnace is finished, rapidly reversing the furnace and discharging slag, wherein the final slag discharging angle range is 87-90 degrees;
step five: carrying out secondary slagging operation: performing secondary slagging and normal smelting;
step six: controlling the addition amount of lime for secondary slagging and the amount of light-burned dolomite:
the secondary slagging lime addition = mass of sio2 in the slag after the early-stage slag discharge and target slag final slag alkalinity/calcium oxide content of lime/lime yield;
wherein, the mass of sio2 in the slag after the early slag tapping (= (molten iron amount, molten iron silicon content and scrap steel amount, scrap steel silicon content) = 2.14 (1-slag tapping proportion); the final slag alkalinity of the secondary slagging slag is controlled to be 2.8-3.5, and the magnesium oxide of the secondary slagging slag is controlled to be 5.5-6.5%;
step seven: controlling oxygen supply for secondary slagging: the flow rate of oxygen supply for secondary slagging adopts a control method of early weakening and late stage, the oxygen supply intensity is controlled within 2.5-2.8 m3/t.min within 2 minutes after the secondary slagging is started to be blown, the oxygen supply intensity is controlled within 2.8-3.5 m3/t.min within 2-4 minutes after the secondary slagging is started to be blown, and the oxygen supply intensity is controlled within 3.8-4 m3/t.min after 4 minutes after the secondary slagging is started to be blown;
wherein the lance position of the oxygen lance is controlled to be 190-250 cm, and the lance position is controlled to be 180-190 cm by 10% oxygen content at the blowing end stage;
step eight: obtaining secondary slagging target slag: the final slag alkalinity of secondary slagging target slag is controlled to be 2.8-3.5, the end point temperature is controlled to be 1590-1600 ℃, the mass percentage of dynamic carbon is controlled to be 0.2-0.3%, and the dynamic temperature is controlled to be 1560-1580 ℃;
step nine: and finishing the double-slag smelting.
2. The smelting control method for the converter retained slag double-slag smelting according to claim 1 is characterized in that: the lime amount = (molten iron amount, molten iron silicon content, 2.14+ scrap steel amount, scrap steel silicon content, 2.14) the early-stage slag target alkalinity/lime calcium oxide content/lime yield-the early-stage furnace slag effective calcium oxide-the early-stage required light-burned dolomite amount, the calcium oxide content of the light-burned dolomite.
3. The smelting control method for the converter retained slag double-slag smelting according to claim 1 is characterized in that: the pre-slag amount = molten iron amount, molten iron silicon content, 2.14+ scrap steel amount, molten iron manganese content, 72/56+ scrap steel amount, molten iron manganese content, 72/56+ molten iron phosphorus content, 142/62 + early dephosphorization efficiency + (molten iron silicon content, 2.14+ scrap steel amount, molten iron silicon content, 2.14+ molten iron manganese content, 72/56+ scrap steel amount, molten iron manganese content, 72/56+ molten iron phosphorus content, 142/62 + early dephosphorization efficiency), the early-stage total iron content of the slag + pre-slag amount; wherein the content of the total iron in the early-stage slag is 30 percent, and the early-stage dephosphorization efficiency is 55 percent.
4. The smelting control method for the converter slag-remaining double-slag smelting according to claim 1, characterized by comprising the following steps: the amount of the light-burned dolomite added for secondary slagging = (the total amount of the slag after secondary slagging, the target magnesium oxide content of the slag-the slag discharging proportion, the total amount of the slag before slag discharging)/(1-the target magnesium oxide content of the slag);
wherein, the total amount of the slag after secondary slagging = (1-slagging proportion) × the total amount of the slag before slagging + the addition amount of secondary slagging lime, and the total amount of the slag before slagging = the amount of the front slag + the lime amount of the front furnace slag.
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