CN112143850A - Sintered ore for electric furnace washing of smelting cord steel and furnace washing method thereof - Google Patents
Sintered ore for electric furnace washing of smelting cord steel and furnace washing method thereof Download PDFInfo
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- CN112143850A CN112143850A CN201910573929.6A CN201910573929A CN112143850A CN 112143850 A CN112143850 A CN 112143850A CN 201910573929 A CN201910573929 A CN 201910573929A CN 112143850 A CN112143850 A CN 112143850A
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- sintered ore
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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
- C21C5/52—Manufacture of steel in electric furnaces
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
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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
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention discloses a sintered ore for washing an electric furnace for smelting cord steel and a washing method thereof, wherein the sintered ore comprises the following main raw materials in percentage by weight of Fe 55-65%, FeO 5-15%, and SiO21~11%、CaO6~16%、MgO0~10%、Al2O31~3%、K2O0~2%、Na2O0-2%, S0-1%, P0-1.2%. The sintered ore is prepared through the processes of heating and breaking, stirring and mixing, cooling and screening. The furnace washing method of the sinter comprises the following steps: (1) loading the finished sintered ore into an elevated bunker; (2) after smelting 10-12 furnaces of cord steel by an electric furnace, putting the cord steel into a finished sintered ore washing furnace in batches; (3) and observing the fluidity of the slag after the finished sintered ore is put into the electric furnace, putting the next batch of finished sintered ore when the fluidity of the slag is poor until the hearth of the electric furnace is recovered to be normal, and controlling the alkalinity of the slag to be 1.5-2.0. In the invention, a small amount of sinter is added in a certain period of smelting the cord steel by the electric furnace, so that the fluidity of the slag is improved, and the method is goodThe furnace bottom rising is restrained, good conditions are created for the electric furnace to continuously smelt the cord steel, and the purpose of washing the electric furnace is achieved.
Description
Technical Field
The invention relates to the field of steel smelting, in particular to a sintered ore for washing an electric furnace for smelting cord steel and a furnace washing method thereof.
Background
The cord steel is the most widely developed product in rubber framework materials and is also the product with the greatest production difficulty in metal products. The definition of cord steel in the standard by the international bureau of standardization for synthetic fibres is: "a structure consisting of two or more steel filaments, or a combination of strands or filaments. "
The production of the cord steel has very strict requirements on the control of non-metallic inclusions, in order to reduce the generation of non-deformed inclusions in molten steel, acid slag smelting is adopted to inhibit aluminum return in the refining process, and the cord steel is smelted by an electric furnace, so that the alkalinity of final slag needs to be controlled, the phenomenon of furnace bottom rising can occur when the cord steel is produced for a long time, the furnace space is reduced along with the furnace bottom rising, the standardized operation of the electric furnace is greatly limited, and the reduction of the steel output is caused.
Disclosure of Invention
The invention provides a sintered ore for washing an electric furnace for smelting cord steel and a furnace washing method thereof, which are used for solving the problem that normal smelting operation is influenced due to the fact that the furnace bottom of the electric furnace for producing the cord steel rises for a long time.
The sintered ore for the electric furnace washing of the cord steel smelting furnace comprises the following main raw materials in percentage by weight of Fe 55-65%, FeO 5-15%, and SiO21～11％、CaO6～16％、MgO0～10％、Al2O31～3％、K2O0～2％、Na2O0-2%, S0-1% and P0-1.2%, wherein the sintered ore is prepared by the working procedures of heating and breaking, stirring and mixing, cooling and screening.
Preferably, the temperature for heating and cracking is 1000-1200 ℃; the cooling temperature is 120 ℃, and finished sintered ore with the granularity of less than 5mm is screened out.
A furnace washing method of a sinter for electric furnace washing of smelting cord steel comprises the following steps:
1) loading the finished sintered ore into an elevated bunker;
2) after smelting 10-12 furnaces of cord steel by an electric furnace, putting the cord steel into a finished sintered ore washing furnace in batches;
3) and observing the fluidity of the slag after the finished sintered ore is put into the electric furnace, putting the next batch of finished sintered ore when the fluidity of the slag is poor until the hearth of the electric furnace is recovered to be normal, and controlling the alkalinity of the slag to be 1.5-2.0.
Preferably, after 10-12 furnace cord steel is smelted by the electric furnace, 2-4 batches of finished sintered ore are put into the electric furnace for furnace washing.
Preferably, the input amount of the sintered ore in each batch is 200-400 kg, and the input amount of the sintered ore in each batch is 1000-1200 kg.
More preferably, the electric furnace smelting cord steel adopts a batching process with molten iron ratio of 70-80% and scrap steel ratio of 15-20%.
The furnace washing principle of adding sinter: after molten iron is added by electric furnace heat, the carbon adding amount in the furnace is increased, the oxygen supply intensity in the smelting process is increased, the carbon-oxygen reaction in the furnace is more violent, the slag phase oxygen transfer rate of a molten pool in the furnace is less than the oxygen consumption rate of the carbon-oxygen reaction, the back drying phenomenon occurs because FeO is quickly consumed in slag, the electric furnace smelts cord steel for a long time, slag is easy to deposit and is retained around the furnace bottom and the furnace wall, so that slag materials are bonded into blocks under the high-temperature condition and are connected into pieces and difficult to be discharged out of the furnace, the thickness of a slag layer is gradually thickened, the hearth is reduced, the normal smelting operation is seriously hindered, and after the hearth is reduced (expanded), the problem that the smelting process can occur:
1. under the condition that the oxygen blowing intensity of an oxygen lance is not changed, a hearth is reduced due to furnace expansion, carbon-oxygen reaction (C + O is CO) in the furnace is aggravated, the decarburization speed is high, the carbon content in molten steel is seriously insufficient in the later period of smelting steel in each furnace, foam slag is difficult to make, the molten steel is gradually oxidized, and the carbon at the end point of tapping cannot be guaranteed.
2. Under the condition that the total loading amount is not changed, the furnace expansion leads to the reduction of the depth of a molten pool, a large amount of molten steel is mixed at the furnace door to be discharged along with the molten steel, the yield of the molten steel is seriously influenced, and the steel discharge amount cannot be ensured.
Wherein, the melting and decomposition of the sinter are endothermic reactions, which must be added in a proper amount in batches when the molten pool reaches a certain high temperature. Otherwise, the more the addition, the larger the temperature drop of the molten pool, the more the decarburization reaction speed is inhibited, and after the temperature is raised again, the reaction speed is rapidly raised, the boiling is caused, and the molten steel is easy to run out of the furnace door.
Therefore, in view of the above problems, periodic furnace washing is required in the continuous production process. The main components of the sintered ore are iron oxides, mainly Fe2O3, Fe3O4, CaO, SiO2 and the like, the TFe content is more than 55%, the sintered ore is added during drying, namely FeO is directly provided for the slag, the drying return phenomenon generated by violent carbon-oxygen reaction in the oxidation process can be effectively relieved, the furnace bottom rising is inhibited, the accumulated slag in the furnace is removed through the reaction of continuously adding 2-4 furnace steel, the furnace hearth is recovered to be normal, and the reaction mechanism is as follows: [C] + (FeO) ═ Fe (liquid) + CO.
The invention has the beneficial effects that: a small amount of sinter is added in a certain period of smelting the cord steel by the electric furnace, so that the fluidity of the slag is improved, the rising of the furnace bottom is well inhibited, good conditions are created for continuously smelting the cord steel by the electric furnace, and the aim of washing the electric furnace is fulfilled.
Detailed Description
The present invention will be further described with reference to the following examples;
a certain steel mill adopts an FUCHS vertical electric furnace to produce the cord steel, when 10-12 furnace cord steel is smelted, the production is forced to stop because the furnace bottom rises seriously, other varieties are changed, the continuity of the production is not facilitated, and therefore, the furnace washing is carried out through the following steps:
1) the raw materials comprise Fe57.01 percent, FeO 9.4 percent and SiO in percentage by weight25.15％、CaO10.12％、MgO1.65％、Al2O31.72％、K2O0.044％、Na2Finished sintered ore package of 0.045% of O, 0.026% of S and 0.076% of PEntering a high-level stock bin;
2) after smelting 10 furnace cord steel by the electric furnace, putting the electric furnace into finished sintered ore in batches for washing, wherein the total mass of the finished sintered ore is 1000-1200 kg;
3) and observing the fluidity of the slag after the finished sintered ore is put into the electric furnace, when the fluidity of the slag is poor, putting the finished sintered ore into the electric furnace in batches for washing until the hearth of the electric furnace is recovered to be normal, and controlling the alkalinity of the slag to be 1.5.
The batch conditions for finished sinter addition are as follows:
| furnace batch number | First batch (kg) | Second batch (kg) | Third batch (kg) | Fourth batch (kg) | Total (kg) |
| 1950005653 | 300 | 300 | 300 | 300 | 1200 |
| 1950005654 | 200 | 300 | 300 | 200 | 1000 |
| 1950005655 | 200 | 300 | 200 | 300 | 1000 |
Furnace washing end point control (LX72A)
| Furnace batch number | End point C (%) | End point P (%) | End point S (%) | End point Mn (%) | End point Si (%) | End point T (. degree. C.) |
| 1950005653 | 0.15 | 0.010 | 0.012 | 0.12 | 0.008 | 1622 |
| 1950005654 | 0.22 | 0.009 | 0.011 | 0.14 | 0.006 | 1619 |
| 1950005655 | 0.19 | 0.011 | 0.010 | 0.15 | 0.007 | 1620 |
The furnace hearth changes before and after washing the stove compare the analysis table:
therefore, the finished product of the sintered ore is used for washing the furnace, the end point control of the electric furnace meets the process requirements of the cord steel, the end point components and the end point temperature control are not adversely affected, the total loading quantity and the steel tapping quantity of the electric furnace before and after washing the furnace are respectively improved to the normal level of the furnace, and the effect of washing the furnace is achieved.
Claims (6)
1. The sintered ore for the electric furnace washing of the smelting cord steel is characterized in that: the weight percentage of the main raw materials of the sinter is Fe 55-65%, FeO 5-15%, SiO21~11%、CaO6~16%、MgO0~10%、Al2O31~3%、K2O0~2%、Na2O0-2%, S0-1%, P0-1.2%; the sintered ore is prepared by the working procedures of heating, breaking, stirring, mixing, cooling and screening.
2. The sintered ore for washing the furnace of the electric furnace for smelting the cord steel according to claim 1, wherein: the heating and cracking temperature is 1000-1200 ℃, the cooling temperature is 120 ℃, and the finished sintered ore with the granularity of less than 5mm is screened out.
3. A method for washing sintered ore for an electric furnace for washing cord steel according to any one of claims 1 to 2, characterized by comprising the steps of:
1) loading the finished sintered ore into an elevated bunker;
2) after smelting 10-12 furnaces of cord steel by an electric furnace, putting the cord steel into a finished sintered ore washing furnace in batches;
3) and observing the fluidity of the slag after the finished sintered ore is put into the electric furnace, putting the next batch of finished sintered ore when the fluidity of the slag is poor until the hearth of the electric furnace is recovered to be normal, and controlling the alkalinity of the slag to be 1.5-2.0.
4. The method of washing sintered ore for washing electric furnace for smelting cord steel according to claim 3, characterized by comprising: after smelting 10-12 furnace cord steel, 2-4 batches of finished sintered ore are put into the electric furnace for washing.
5. The method of washing sintered ore for washing electric furnace for smelting cord steel according to claim 3, characterized by comprising: the input amount of each batch of the sintered ore is 200-400 kg, and the input amount of each batch of the sintered ore is 1000-1200 kg.
6. The method of washing sintered ore for washing electric furnace for smelting cord steel according to claim 3, characterized by comprising: the electric furnace smelting of the cord steel adopts a batching process with molten iron ratio of 70-80% and scrap steel ratio of 15-20%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910573929.6A CN112143850A (en) | 2019-06-28 | 2019-06-28 | Sintered ore for electric furnace washing of smelting cord steel and furnace washing method thereof |
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| CN201910573929.6A CN112143850A (en) | 2019-06-28 | 2019-06-28 | Sintered ore for electric furnace washing of smelting cord steel and furnace washing method thereof |
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| CN112143850A true CN112143850A (en) | 2020-12-29 |
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Citations (7)
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| CN101451211A (en) * | 2007-12-07 | 2009-06-10 | 江苏沙钢集团有限公司 | Method for smelting tire cord steel by electric arc |
| CN103556068A (en) * | 2013-11-14 | 2014-02-05 | 德龙钢铁有限公司 | Method for producing weather-resisting steel by using low-grade nickel ores |
| 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 |
| CN104878157A (en) * | 2015-07-03 | 2015-09-02 | 衡阳华菱钢管有限公司 | High ratio hot metal charging electric furnace smelting method using sintered ore as modifier |
| CN104988258A (en) * | 2015-07-14 | 2015-10-21 | 江苏永钢集团有限公司 | Mixed sintering ore |
| WO2018014364A1 (en) * | 2016-07-18 | 2018-01-25 | 东北大学 | Method for smelting reduction production and tempering of titaniferous mixed slag |
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| CN101451211A (en) * | 2007-12-07 | 2009-06-10 | 江苏沙钢集团有限公司 | Method for smelting tire cord steel by electric arc |
| CN103556068A (en) * | 2013-11-14 | 2014-02-05 | 德龙钢铁有限公司 | Method for producing weather-resisting steel by using low-grade nickel ores |
| 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 |
| CN104878157A (en) * | 2015-07-03 | 2015-09-02 | 衡阳华菱钢管有限公司 | High ratio hot metal charging electric furnace smelting method using sintered ore as modifier |
| CN104988258A (en) * | 2015-07-14 | 2015-10-21 | 江苏永钢集团有限公司 | Mixed sintering ore |
| WO2018014364A1 (en) * | 2016-07-18 | 2018-01-25 | 东北大学 | Method for smelting reduction production and tempering of titaniferous mixed slag |
| CN109055661A (en) * | 2018-09-14 | 2018-12-21 | 中航上大高温合金材料有限公司 | A kind of production technology of low-phosphorous stainless steel |
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