CN107663561A - A kind of smelting process of steel scrap stove external heat reuse - Google Patents
A kind of smelting process of steel scrap stove external heat reuse Download PDFInfo
- Publication number
- CN107663561A CN107663561A CN201710876831.9A CN201710876831A CN107663561A CN 107663561 A CN107663561 A CN 107663561A CN 201710876831 A CN201710876831 A CN 201710876831A CN 107663561 A CN107663561 A CN 107663561A
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- steel scrap
- iron
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- scrap
- bag
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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
- C21C5/56—Manufacture of steel by other methods
- C21C5/562—Manufacture of steel by other methods starting from scrap
- C21C5/565—Preheating of scrap
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/005—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with heating or cooling means
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a kind of smelting process of steel scrap stove external heat reuse, including 1. first solid steel scrap is loaded into iron bag, again coal gas is passed through into the Ladle-casting apparatus being arranged on outside iron bag, the solid steel scrap in iron bag is preheated using coal gas, temperature >=900 DEG C of solid scrap steel preheating, the time of preheating is 70~100min；2. it is to be transported the iron bag equipped with solid steel scrap after preheating out of Ladle-casting apparatus using transfer tool, then the high temperature liquid iron in ladle is blended into the iron bag equipped with solid steel scrap using overhead traveling crane, the solid steel scrap in iron bag is all melted, finally the molten iron after all melting in iron bag is poured into converter and smelted.The present invention one is reduction of the unit consumption of molten iron, adds converter smelting furnace charge steel scrap ratio；Second, smelting temperature when improving converter smelting, shortens smelting cycle, production efficiency is improved；Third, protection resource, saves the energy, reduces environmental pollution.
Description
Technical field
The invention belongs to iron and steel smelting technology field, and in particular to a kind of smelting process of steel scrap stove external heat reuse.
Background technology
The iron-bearing material source of steel and iron industry mainly has two, first, iron ore, second, steel scrap, the former is natural resources,
The latter is the regenerated resources of recovery.At present, in large-scale integrated iron and steel works, from iron ore enter factory to coking, sintering, ironmaking and
Steel-making, in whole technological process energy resource consumption and disposal of pollutants be concentrated mainly on ironmaking and preceding process, typically constitute from comprehensive energy consumption
60%, that is to say, that can save the energy 60% using steel scrap direct steelmaking, wherein often use 1 ton of steel scrap can less with 2 tons of pig iron,
The raw coal of 0.4 ton of coke or 1 ton or so can be saved.As can be seen here, steel mill should use molten iron less as far as possible, use steel scrap, both
Be advantageous to protect resource, be advantageous to save the energy, reduce environmental pollution, promote the sustainable development of resource.However, existing
Using in the technology of scrap smelting, when improving converter smelting furnace charge steel scrap ratio, converter steelmaking process heat is often caused
The phenomenon of deficiency, in order to improve the smelting temperature of smelting converter, typically using two ways, first, adding the gain of heat in converter
Agent, such as Antaciron, coke, another kind add coke, and above two mode is found during the use of reality, adds silicon
Ferroalloy can increase the quantity of slag and reduce iron, manganese yield, and sulphur can be increased by adding coke, and two kinds of heat gaining methods all have heat utilization
Rate is low, adds the defects of steel scrap ratio is limited.Therefore, a kind of smelting cycle that can effectively shorten steel scrap is developed, is reduced
Smelting cost, and can dramatically increase converter smelting steel scrap ratio, ensure the stove external heat reuse of the stable steel scrap of smelting temperature
Smelting process is desirability.
The content of the invention
In order to solve problem present in background technology, it is an object of the invention to a kind of smelting that can effectively shorten steel scrap
The cycle is refined, reduces smelting cost, and can dramatically increases converter smelting steel scrap ratio, ensures that the stable steel scrap stove of smelting temperature is additional
The smelting process of hot reuse.
The object of the present invention is achieved like this, a kind of smelting process of steel scrap stove external heat reuse, comprises the following steps:
1. first solid steel scrap is loaded into iron bag, then coal gas is passed through into the Ladle-casting apparatus being arranged on outside iron bag, utilizes coal gas pair
Solid steel scrap in iron bag is preheated, temperature >=900 DEG C of solid scrap steel preheating, and the time of preheating is 70~100min；
2. the iron bag equipped with solid steel scrap after preheating is transported out of Ladle-casting apparatus using transfer tool, then using overhead traveling crane by iron
High temperature liquid iron in water bag is blended into the iron bag equipped with solid steel scrap, the solid steel scrap in iron bag is all melted, and finally will
Molten iron after all melting in iron bag, which is poured into converter, to be smelted.
Further, step 2. in, in the iron bag useful load of solid steel scrap account for be blended into high temperature liquid iron quality 5~
8%。
Preferably, step 2. in, temperature >=1320 DEG C of the high temperature liquid iron.
Preferably, step 1. in, in the coal gas CO content be 27%.
Further, step 1. in, the solid steel scrap is when choosing, it is necessary to which to remove silt, resistance to material, greasy dirt etc. miscellaneous
Matter.
Further, step 1. in, caused waste gas and smog are by dedusting during the solid scrap steel preheating in iron bag
Cigarette system is received to absorb.
The present invention preheats first with coal gas to solid steel scrap, then adds high temperature liquid iron to promote the solid after preheating to give up
On the one hand the unit consumption of molten iron greatly reduces compared with traditional smelting process in steel fast melt, this smelting process, increase
Converter smelting furnace charge steel scrap ratio, furnace temperature is low, smelting cycle is long when on the other hand solving the smelting of tradition steel-making, smelt into
The problems such as this height, the quantity of slag are big, low production efficiency, effectively raises smelting temperature during converter smelting, can guarantee that smelting completely
Temperature equalization it is stable, it is average to be shortened 5 minutes per the smelting furnace duration of heat compared with traditional method, it is further to shorten
Smelting cycle, improves production efficiency.The smelting process of the present invention is simple, and the cost of investment is low, and easily implements, Ji Nengbao
Resource is protected, saves the energy, and can reduces environmental pollution, and can produce preferable economic benefit, use easy to spread.
Embodiment
With reference to embodiment, the present invention is further illustrated, but the present invention is not any limitation as in any way,
Based on present invention teach that any conversion or replacement made, belong to protection scope of the present invention.
Embodiment 1：
The smelting process of steel scrap stove external heat reuse described in the present embodiment 1, exemplified by applied to 60 tons of converters, is blended into molten iron
Amount is generally 45~50t or so, then the loaded weight of scrap steel preheating is 2~4t, and concrete technology step is as follows:
1. first 2~4 tons of solid steel scrap is loaded into iron bag, the solid steel scrap is when choosing, it is necessary to remove silt, resistance to
The impurity such as material, greasy dirt, then coal gas is passed through into the Ladle-casting apparatus being arranged on outside iron bag, CO content is 27% in coal gas, utilizes coal
Gas preheats to the solid steel scrap in iron bag, and the temperature of solid scrap steel preheating is 900 DEG C, and the time of preheating is 100min；
2. the iron bag equipped with solid steel scrap after preheating is transported out of Ladle-casting apparatus using transfer tool, it is preferable that transfer tool
For train, iron bag is placed aboard, after the solid scrap steel preheating in iron bag is complete, is unwrapped out iron using train, is then utilized
The high temperature liquid iron of 45~50t in ladle is blended into the iron bag equipped with solid steel scrap by overhead traveling crane, and the temperature of high temperature liquid iron is
1320 DEG C, the useful load of solid steel scrap, which accounts for, in iron bag is blended into the 5~8% of high temperature liquid iron quality, makes the solid steel scrap in iron bag whole
Melt, finally the molten iron after all melting in iron bag is poured into converter and smelted.
Embodiment 2：
The smelting process of steel scrap stove external heat reuse described in the present embodiment 2, exemplified by applied to 60 tons of converters, is blended into molten iron
Amount is generally 45~50t or so, then the loaded weight of scrap steel preheating is 2~4t, and concrete technology step is as follows:
1. first 2~4t solid steel scrap is loaded into iron bag, the solid steel scrap choose when, it is necessary to remove silt, resistance to material,
The impurity such as greasy dirt, then coal gas is passed through into the Ladle-casting apparatus being arranged on outside iron bag, CO content is 27% in the coal gas, utilizes coal
Gas preheats to the solid steel scrap in iron bag, 960 DEG C of the temperature of solid scrap steel preheating, and time of preheating is 80min, in iron bag
Solid scrap steel preheating during caused waste gas and smog cigarette system received by dedusting absorbed；
2., using transfer tool the iron bag equipped with solid steel scrap after preheating is transported out of Ladle-casting apparatus, then utilize overhead traveling crane will
The high temperature liquid iron of 45~50t in ladle is blended into the iron bag equipped with solid steel scrap, the dress of solid steel scrap in the iron bag
Carrying capacity, which accounts for, is blended into the 5~8% of high temperature liquid iron quality, and the temperature of the high temperature liquid iron is 1340 DEG C, makes the solid steel scrap in iron bag complete
Portion melts, and finally pours into converter the molten iron after all melting in iron bag and smelts.
Embodiment 3：
The smelting process of steel scrap stove external heat reuse described in the present embodiment 3, exemplified by applied to 60 tons of converters, is blended into molten iron
Amount is generally 45~50t or so, then the loaded weight of scrap steel preheating is 2~4t, and concrete technology step is as follows:
1. first 2~4t solid steel scrap is loaded into iron bag, the solid steel scrap choose when, it is necessary to remove silt, resistance to material,
The impurity such as greasy dirt, then coal gas is passed through into the Ladle-casting apparatus being arranged on outside iron bag, the solid steel scrap in iron bag is carried out using coal gas
Preheating, 980 DEG C of the temperature of solid scrap steel preheating, time of preheating are 70min, are produced during the solid scrap steel preheating in iron bag
Waste gas and smog cigarette system is received by dedusting and absorbed；
2. the iron bag equipped with solid steel scrap after preheating is transported out of Ladle-casting apparatus using transfer tool, then using overhead traveling crane by iron
The high temperature liquid iron of 45~50t in water bag is blended into the iron bag equipped with solid steel scrap, the loading of solid steel scrap in the iron bag
Amount, which accounts for, is blended into the 5~8% of high temperature liquid iron quality, and the temperature of the high temperature liquid iron is 1360 DEG C, makes the solid steel scrap in iron bag whole
Melt, finally the molten iron after all melting in iron bag is poured into converter and smelted.
Above-described embodiment 1~3 is that solid steel scrap is preheated first with coal gas, then to add high temperature liquid iron pre- to promote
Solid steel scrap fast melt after heat, greatly reduces the consumption of molten iron compared with traditional method, averagely often smelts a stove and gives up
Duration of heat of steel shortens 5 minutes, shortens smelting cycle, and production efficiency is also just faster.
Claims (6)
1. a kind of smelting process of steel scrap stove external heat reuse, comprises the following steps:
1. first solid steel scrap is loaded into iron bag, then coal gas is passed through into the Ladle-casting apparatus being arranged on outside iron bag, utilizes coal gas pair
Solid steel scrap in iron bag is preheated, temperature >=900 DEG C of solid scrap steel preheating, and the time of preheating is 70~100min；
2. the iron bag equipped with solid steel scrap after preheating is transported out of Ladle-casting apparatus using transfer tool, then using overhead traveling crane by iron
High temperature liquid iron in water bag is blended into the iron bag equipped with solid steel scrap, the solid steel scrap in iron bag is all melted, and finally will
Molten iron after all melting in iron bag, which is poured into converter, to be smelted.
A kind of 2. smelting process of steel scrap stove external heat reuse according to claim 1, it is characterised in that：In step 2.
In, the useful load of solid steel scrap, which accounts for, in the iron bag is blended into the 5~8% of high temperature liquid iron quality.
A kind of 3. smelting process of the stove external heat reuse of steel scrap according to claim 1, it is characterised in that：In step 2.
In, temperature >=1320 DEG C of the high temperature liquid iron.
A kind of 4. smelting process of steel scrap stove external heat reuse according to claim 1, it is characterised in that：In step 1.
In, CO content is 27% in the coal gas.
A kind of 5. smelting process of steel scrap stove external heat reuse according to claim 1, it is characterised in that：In step 1.
In, the solid steel scrap is when choosing, it is necessary to remove the impurity such as silt, resistance to material, greasy dirt.
A kind of 6. smelting process of steel scrap stove external heat reuse according to claim 1, it is characterised in that：In step 1.
In, caused waste gas and smog are received cigarette system by dedusting and absorbed during the solid scrap steel preheating in iron bag.
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| CN201710876831.9A CN107663561A (en) | 2017-09-25 | 2017-09-25 | A kind of smelting process of steel scrap stove external heat reuse |
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| CN201710876831.9A CN107663561A (en) | 2017-09-25 | 2017-09-25 | A kind of smelting process of steel scrap stove external heat reuse |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108611460A (en) * | 2018-06-06 | 2018-10-02 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method that scrap steel preheating method, semisteel smelting increase hot metal output |
| CN108676946A (en) * | 2018-06-14 | 2018-10-19 | 邯郸钢铁集团有限责任公司 | A kind of whole process reduces the smelting process of molten steel consumption |
| CN108728176A (en) * | 2018-04-16 | 2018-11-02 | 东北大学 | A kind of method of gas reforming in scrap steel preheating system |
| CN109182641A (en) * | 2018-09-30 | 2019-01-11 | 四川德胜集团钒钛有限公司 | A kind of method that semisteel smelting reduces iron loss |
| CN109439835A (en) * | 2018-12-28 | 2019-03-08 | 云南玉溪仙福钢铁（集团）有限公司 | Improve steel-making scrap iron and steel use than method |
| CN109593905A (en) * | 2018-12-04 | 2019-04-09 | 天津钢铁集团有限公司 | Steel scrap baking method in a kind of Converter |
| CN109852760A (en) * | 2018-12-03 | 2019-06-07 | 江苏省沙钢钢铁研究院有限公司 | A kind of converter preheating scrap improves the smelting process of scrap ratio |
| CN110628980A (en) * | 2019-08-27 | 2019-12-31 | 江苏省沙钢钢铁研究院有限公司 | Smelting method for improving scrap steel ratio by preheating scrap steel in iron ladle through oxygen combustion gun |
| CN113604727A (en) * | 2021-08-11 | 2021-11-05 | 宝武集团鄂城钢铁有限公司 | Smelting method for improving yield of scrap steel metal based on BOF-CC process |
| CN115704055A (en) * | 2021-08-10 | 2023-02-17 | 上海梅山钢铁股份有限公司 | Method for smelting molten steel by converter with large scrap steel ratio |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108728176A (en) * | 2018-04-16 | 2018-11-02 | 东北大学 | A kind of method of gas reforming in scrap steel preheating system |
| CN108728176B (en) * | 2018-04-16 | 2020-11-03 | 东北大学 | Method for modifying coal gas in scrap steel preheating system |
| CN108611460A (en) * | 2018-06-06 | 2018-10-02 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method that scrap steel preheating method, semisteel smelting increase hot metal output |
| CN108676946A (en) * | 2018-06-14 | 2018-10-19 | 邯郸钢铁集团有限责任公司 | A kind of whole process reduces the smelting process of molten steel consumption |
| CN109182641A (en) * | 2018-09-30 | 2019-01-11 | 四川德胜集团钒钛有限公司 | A kind of method that semisteel smelting reduces iron loss |
| CN109852760A (en) * | 2018-12-03 | 2019-06-07 | 江苏省沙钢钢铁研究院有限公司 | A kind of converter preheating scrap improves the smelting process of scrap ratio |
| CN109593905A (en) * | 2018-12-04 | 2019-04-09 | 天津钢铁集团有限公司 | Steel scrap baking method in a kind of Converter |
| CN109439835A (en) * | 2018-12-28 | 2019-03-08 | 云南玉溪仙福钢铁（集团）有限公司 | Improve steel-making scrap iron and steel use than method |
| CN109439835B (en) * | 2018-12-28 | 2021-01-05 | 云南玉溪仙福钢铁（集团）有限公司 | Method for improving utilization ratio of steelmaking scrap |
| CN110628980A (en) * | 2019-08-27 | 2019-12-31 | 江苏省沙钢钢铁研究院有限公司 | Smelting method for improving scrap steel ratio by preheating scrap steel in iron ladle through oxygen combustion gun |
| CN115704055A (en) * | 2021-08-10 | 2023-02-17 | 上海梅山钢铁股份有限公司 | Method for smelting molten steel by converter with large scrap steel ratio |
| CN113604727A (en) * | 2021-08-11 | 2021-11-05 | 宝武集团鄂城钢铁有限公司 | Smelting method for improving yield of scrap steel metal based on BOF-CC process |
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Application publication date: 20180206 |