CN102978337A - Method for slagging by using limestone for continuous steelmaking furnace - Google Patents
Method for slagging by using limestone for continuous steelmaking furnace Download PDFInfo
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- CN102978337A CN102978337A CN2012105777489A CN201210577748A CN102978337A CN 102978337 A CN102978337 A CN 102978337A CN 2012105777489 A CN2012105777489 A CN 2012105777489A CN 201210577748 A CN201210577748 A CN 201210577748A CN 102978337 A CN102978337 A CN 102978337A
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- wingdale
- slag
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- limestone
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Abstract
The invention relates to a method for slagging by using limestone for a continuous steelmaking furnace. According to the method, limestone with diameter of 20 to 70mm is added in batch through a high-level bulk material system according to the conditions of in-furnace oxygen supply strength, molten-steel adding speed, alkalinity of slag, and temperature of a molten pool during smelting; the limestone chemically reacts by absorbing the heat of a high-temperature molten pool as follows: CaCO3+Q=CaO+CO2, and the product CaO meets the requirement on production of alkaline slag; the limestone absorbs the heat and is decomposed and reduce the temperature of molten pool; and the limestone is chemically decomposed by absorbing the heat at high temperature, thus forming the slag. By adopting the method, the amount of added hot metal can be greatly increased, the hot metal ratio is up to 90%, the heat under large amounts of hot metal can be fully utilized at the same time; the technology of electric melting of a Consteel electric furnace is removed, so that the cost of steel per ton is remarkably reduced, the steel structure of the electric furnace is more flexibility, and the benefit is provided for solving problems that the waste steel is poor in quality and the resource is not abundant. The method for slagging through the limestone reduces the processes of coasting the lime, and therefore, the purpose of energy conservation is realized, and social benefit is remarkable.
Description
Technical field
The invention belongs to steelmaking technical field, relate to and a kind ofly solve high ferro in the steelmaking process than the continuous steelmaking electric furnace slagging with Lime stone method more than needed of bringing heat.
Background technology
At present steel-making is made the most lime that use of basic slag and is made starting material.In recent years because the scrap resources price is high and the impact of steel market depression, larger variation has occured in continuous steelmaking electric furnace Consteel technique iron and steel stock structure, electric furnace colleague most enterprises is with a certain proportion of liquid iron charging (about 50-60%), a certain proportion of steel scrap of arranging in pairs or groups, utilize the sensible heat of molten iron and the chemical heat of chemical reaction to reach the reduction energy consumption, save the purpose of cost.Pursue the needs that high hot metal ratio is Reducing Cost in Enterprises.Because the Consteel electric furnace has scrap steel preheating, if adopt traditional slag material-lime, then the ton steel water consumes 850kg, just the basic heat balance that realizes.Will further improve the molten iron ratio, reduce the steel scrap consumption, the heat energy surplus then occur, superfluous heat energy all brings great infringement to Processes and apparatus, and this also is the basic reason that hot metal ratio is difficult to improve again.
Summary of the invention
In order to overcome the above-mentioned shortcoming of prior art
,The invention provides and a kind ofly can solve high hot metal ratio and bring heat problem more than needed can satisfy again the slag making technological method of basic slag steel-making, the unslaked lime stone that namely adopts roasting lime to use carries out steelmaking slagging, utilize heat more than needed in the molten bath, the Wingdale decomposition is become the slagging process of lime, efficiently solve the high hot metal ratio of consteel electric furnace and cause heat problem more than needed, stablized technique, improved simultaneously production capacity, reduce energy consumption, also reduced the continuous steelmaking electric furnace slagging with Lime stone method of production cost.
The technical solution adopted for the present invention to solve the technical problems is: a kind of continuous steelmaking electric furnace slagging with Lime stone method, in smelting process, add speed, basicity of slag, bath temperature situation according to oxygen supply intensity, molten iron in the stove, the Wingdale that in batches adds diameter 20 ㎜～70 ㎜ by high-order balk cargo system, Wingdale is through absorbing the heat energy generation chemical reaction in high temperature molten bath, CaCO
3+ Q=CaO+CO
2, product C aO has satisfied the requirement of making basic slag, and the Wingdale thermal endothermic decomposition reduces bath temperature, and decomposition occurs in heat absorption under high temperature action, forms slag.
Determine the add-on of Wingdale according to the requirement of silicone content, heat surplus capacity and the steel grade phosphorus of molten iron, the add-on of Wingdale={ (Si content * iron water amount in the molten iron+steel scrap Si content * steel scrap amount) * 60 * R }/CaO content in 28 * Wingdale,
Basicity R=CaO/ SiO wherein
2Si is all oxidized: Si+ O
2=SiO
2Basicity R scope 2～2.5; Molecular weight: Si=28; SiO
2=60; CaO content 51%～53% in the Wingdale.
Determine adding mode and method, the adding mode adopts 100kg～1000kg to add in batches; Basicity and bath temperature that adition process is looked slag add in smelting process as required.
The physical and chemical reaction that occurs after Wingdale adds: CaCO
3+ Q=CaO+CO
2, absorb the heat energy in the molten bath, in certain scope, reduced the temperature in molten bath, the smelting temperature of continuous steelmaking electric furnace is controlled at 1520
0C-1660
0C, it is temperature required to satisfy decomposition of limestone, and product C aO forms slag.
Positively effect of the present invention is: after adopting the technical matters of slagging with Lime stone, the Consteel electric furnace can increase substantially the add-on of molten iron, hot metal ratio can reach 90%, take full advantage of simultaneously the heat energy of high iron water amount, cancelled the technique that the Consteel electric furnace send electric smelting, it is remarkable that the ton steel reduces cost, it is Electric Furnace Steelmaking the next item up important breakthrough, the iron and steel stock structure of electric furnace becomes more flexible, and it is of poor quality to be conducive to solve steel scrap, the situation that resource is relatively nervous.Reduce the lime-roasting operation with slagging with Lime stone simultaneously, reach energy-conservation purpose, social benefit is also obvious.
Description of drawings
Fig. 1 is composition (mean value) table that adopts Wingdale.
Fig. 2 is that continuous steelmaking is smelted the hot metal composition table that adds.
Fig. 3 uses the actual amount of lime table of continuous steelmaking electric furnace slag-making of the present invention.
Fig. 4 is the terminal point sample ingredient table of continuous steelmaking electrosmelting HRB335 steel grade behind use the present invention.
Embodiment
The present invention is further described below in conjunction with embodiment and accompanying drawing.
Referring to Fig. 1 to Fig. 4, a kind of continuous steelmaking electric furnace slagging with Lime stone method, in smelting process, add speed, basicity of slag, bath temperature situation according to oxygen supply intensity, molten iron in the stove, the Wingdale that in batches adds diameter 20 ㎜～70 ㎜ by high-order balk cargo system, Wingdale is through absorbing the heat energy generation chemical reaction in high temperature molten bath, CaCO
3+ Q=CaO+CO
2Product C aO has satisfied the requirement of making basic slag, and the Wingdale thermal endothermic decomposition reduces bath temperature, and decomposition occurs in heat absorption under high temperature action, form slag, reached and to solve high hot metal ratio and bring heat problem more than needed can satisfy the purpose of making the basic slag processing requirement again.
Calculate the add-on of Wingdale according to the requirement of silicone content, heat surplus capacity and the steel grade phosphorus of molten iron.
Calculation formula is:
The add-on of Wingdale={ (Si content * iron water amount in the molten iron+steel scrap Si content * steel scrap amount) * 60 * R }/CaO content in 28 * Wingdale,
Annotate: basicity R=CaO/ SiO2; Si is all oxidized: Si+ O2=SiO2; Basicity R scope 2～2.5; Molecular weight: Si=28; SiO2=60; CaO content 51%～53% in the Wingdale.
Determine adding mode and method, the adding mode adopts 100kg～1000kg to add in batches; Basicity and bath temperature that adition process is looked slag add in smelting process as required.
The physical and chemical reaction that occurs after Wingdale adds: CaCO
3+ Q=CaO+CO
2, absorb the heat energy in the molten bath, in certain scope, reduced the temperature in molten bath.The smelting temperature of Consteel electric furnace is controlled at 1520
0C-1660
0C, it is temperature required to satisfy decomposition of limestone, and product C aO forms slag.
Embodiment is from angle practical, strong operability, mainly determines add-on and adding opportunity according to flowability, the bath temperature of hot metal composition, slag.
Implementation comprises the steps:
(1) enterprise procurement specification Wingdale (diameter 20 ㎜～70 ㎜).
(2) Wingdale transports and lifts to the high compartment of balk cargo.
(3) analyze hot metal composition, press the average basicity R of slag 〉=2 controls, determine roughly add-on of this stove steel Wingdale.
(4) every stove steel divides many batches to add Wingdale in smelting cycle according to circumstances, and every batch adds 100-1000 kg.
(5) Consteel eaf process characteristics are to stay steel, remaining slag operation, and therefore every stove steel is everlasting 1620 at the initial smelting period bath temperature than high pass
0C-1660
0The C scope adds first 1000 kg Wingdales and reduces bath temperature.
(6) smelt mid-term along with bath temperature, basicity of slag, the slag fluidity changing conditions in time adds Wingdale in batches, so that satisfy the tapping condition.
By above experiment, the present invention adopts slagging with Lime stone technique, can effectively reduce production costs, and satisfy the process for making demand, and the economic benefit of generation is very considerable.
Claims (4)
1. continuous steelmaking electric furnace slagging with Lime stone method, it is characterized in that: in smelting process, add speed, basicity of slag, bath temperature situation according to oxygen supply intensity, molten iron in the stove, the Wingdale that in batches adds diameter 20 ㎜～70 ㎜ by high-order balk cargo system, Wingdale is through absorbing the heat energy generation chemical reaction in high temperature molten bath, CaCO
3+ Q=CaO+CO
2, product C aO has satisfied the requirement of making basic slag, and the Wingdale thermal endothermic decomposition reduces bath temperature, and decomposition occurs in heat absorption under high temperature action, forms slag.
2. continuous steelmaking electric furnace slagging with Lime stone method as claimed in claim 1, it is characterized in that: the add-on of determining Wingdale according to the requirement of silicone content, heat surplus capacity and the steel grade phosphorus of molten iron, the add-on of Wingdale={ (Si content * iron water amount in the molten iron+steel scrap Si content * steel scrap amount) * 60 * R }/CaO content in 28 * Wingdale
Basicity R=CaO/ SiO wherein
2Si is all oxidized: Si+ O
2=SiO
2Basicity R scope 2～2.5; Molecular weight: Si=28; SiO
2=60; CaO content 51%～53% in the Wingdale.
3. continuous steelmaking electric furnace slagging with Lime stone method as claimed in claim 1, it is characterized in that: determine adding mode and method, the adding mode adopts 100kg～1000kg to add in batches; Basicity and bath temperature that adition process is looked slag add in smelting process as required.
4. continuous steelmaking electric furnace slagging with Lime stone method as claimed in claim 1 is characterized in that: the physical and chemical reaction that occurs after Wingdale adds: CaCO
3+ Q=CaO+CO
2, absorb the heat energy in the molten bath, in certain scope, reduced the temperature in molten bath, the smelting temperature of continuous steelmaking electric furnace is controlled at 1520
0C-1660
0C, it is temperature required to satisfy decomposition of limestone, and product C aO forms slag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105777489A CN102978337A (en) | 2012-12-27 | 2012-12-27 | Method for slagging by using limestone for continuous steelmaking furnace |
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|---|---|---|---|
| CN2012105777489A CN102978337A (en) | 2012-12-27 | 2012-12-27 | Method for slagging by using limestone for continuous steelmaking furnace |
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| CN102978337A true CN102978337A (en) | 2013-03-20 |
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| CN2012105777489A Pending CN102978337A (en) | 2012-12-27 | 2012-12-27 | Method for slagging by using limestone for continuous steelmaking furnace |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104498667A (en) * | 2014-12-09 | 2015-04-08 | 广东韶钢松山股份有限公司 | Slagging method of sintering return mines of continuous steelmaking electric furnace |
| CN107236843A (en) * | 2017-05-23 | 2017-10-10 | 舞阳钢铁有限责任公司 | The method that electric stove door badly bleeding is controlled under the conditions of high hot metal ratio |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4843770B1 (en) * | 1970-02-18 | 1973-12-20 | ||
| JP2005089839A (en) * | 2003-09-18 | 2005-04-07 | Jfe Steel Kk | Method for refining molten steel |
| CN101709351A (en) * | 2009-11-28 | 2010-05-19 | 山西太钢不锈钢股份有限公司 | Method for oxygen blast of electric furnace |
| CN101787412A (en) * | 2010-02-10 | 2010-07-28 | 武汉科技大学 | Bottom dusting electrical furnace steelmaking process |
| CN102634637A (en) * | 2012-05-16 | 2012-08-15 | 中天钢铁集团有限公司 | Operation technology for electric furnace converter |
-
2012
- 2012-12-27 CN CN2012105777489A patent/CN102978337A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4843770B1 (en) * | 1970-02-18 | 1973-12-20 | ||
| JP2005089839A (en) * | 2003-09-18 | 2005-04-07 | Jfe Steel Kk | Method for refining molten steel |
| CN101709351A (en) * | 2009-11-28 | 2010-05-19 | 山西太钢不锈钢股份有限公司 | Method for oxygen blast of electric furnace |
| CN101787412A (en) * | 2010-02-10 | 2010-07-28 | 武汉科技大学 | Bottom dusting electrical furnace steelmaking process |
| CN102634637A (en) * | 2012-05-16 | 2012-08-15 | 中天钢铁集团有限公司 | Operation technology for electric furnace converter |
Non-Patent Citations (1)
| Title |
|---|
| 刘炀等: "电弧炉采用石灰石单渣冶炼工艺的研究", 《钢铁研究》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104498667A (en) * | 2014-12-09 | 2015-04-08 | 广东韶钢松山股份有限公司 | Slagging method of sintering return mines of continuous steelmaking electric furnace |
| CN107236843A (en) * | 2017-05-23 | 2017-10-10 | 舞阳钢铁有限责任公司 | The method that electric stove door badly bleeding is controlled under the conditions of high hot metal ratio |
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Application publication date: 20130320 |