CN100350058C - Application of preprocessed molten iron in electric steelmaking - Google Patents
Application of preprocessed molten iron in electric steelmaking Download PDFInfo
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- CN100350058C CN100350058C CNB2005100482734A CN200510048273A CN100350058C CN 100350058 C CN100350058 C CN 100350058C CN B2005100482734 A CNB2005100482734 A CN B2005100482734A CN 200510048273 A CN200510048273 A CN 200510048273A CN 100350058 C CN100350058 C CN 100350058C
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- molten iron
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Abstract
The present invention relates to an application of preprocessing liquid iron in electric furnace steelmaking. The present invention has the ordinal following steps: preprocessing is carried out to liquid iron; the liquid iron is added in a liquid iron preconditioner and is added with lime with weight equal to 1.08% to 1.36% of that of the liquid iron; oxygen blowing is carried out for 6 to 15 min to the liquid iron; lime with weight equal to 4.0% to 4.8% of that of the liquid iron, and dolomite with weight equal to 0.7% to 0.85% of that of the liquid iron are added stage by stage; oxygen blowing continues to be carried out for 16 to 20 min under pressure at 0.6 to 0.8MPa; when the temperature of the liquid iron is more than 1650 DEG C, through analyses, the liquid iron comprises the components of the following percentage: 2.00 to 2.50 of C, Si equal to or less than 0.20, S equal to or less than 0.050, P equal to or less than 0.050, unavoidable impurities and Fe, and the liquid iron becomes preprocessing liquid iron; the 35 to 38 of preprocessing liquid iron, 25 to 28 of ordinary liquid iron and 35 to 38 of scrap steel are added in electric furnaces for carrying out electric transmission, oxygen blowing and smelting; when the components of the liquid steel reaches the specifications of smelting varieties, the liquid steel is tapped. Compared with ordinary liquid iron electric furnace steelmaking methods, the present invention shortens smelting time and saves electric energy.
Description
Technical field
The present invention relates to the application method of a kind of molten iron in Electric furnace steel making.
Background technology
The raw material of electrosmelting is generally steel scrap and molten iron, and the proportioning of steel scrap and molten iron is steel scrap 5-6, molten iron 4-5.Steel scrap 35-42 ton in general every stove, molten iron 28-35 ton, the total Intake Quantity of iron and steel stock is 70 tons because cold burden steel scrap Intake Quantity is big, the molten iron amount of being blended into is few and to be blended into temperature low, converted molten iron after, can't form the molten bath in the electric furnace.Thereby electric furnace early stage can not in time insert oxygen gun blowing, carry out strengthening smelting, thereby electric power feeding time prolongs, current consumption increases, tap to tap time is longer, the throughput of furnace equipment can not be given full play to.If reduce the Intake Quantity of steel scrap, increase hot metal ratio, then change clear carbon height.Molten oxygen phase decarburized amount greatly not only makes the oxygen consumption increase, and prolong tap to tap time, and throughput still can not improve.And cause big splash easily, cause many adverse consequencess.
Summary of the invention
In order to overcome the above-mentioned deficiency that existing common molten iron is used in Electric furnace steel making, the invention provides the application method of a kind of decarburization intensification preprocessed molten iron in Electric furnace steel making, compare with common molten iron electric furnace steelmaking method, shortened tap to tap time, saves energy.
Technical scheme of the present invention is to divide the molten oxygen phase of electric furnace two portions to carry out, be the said hot metal pretreatment device of the present invention with special molten steel decarburization heat riser earlier, molten iron is carried out being blended into electric furnace after decarburization heats up, the steel scrap Intake Quantity reduces in the electric furnace, increased hot metal ratio simultaneously, shortened the time of furnace melting steel scrap, make and to form the molten bath rapidly after having converted molten iron, advance the rifle oxygen blast and improve opportunity, and improved the oxygen rifle and opened blowing temp, can make the electrosmelting bubble level more abundant like this, realize the omnidistance foam operation of electric furnace, thereby shorten the heat, reduce energy consumption of electric furnace, increase production capacity.
Steps in sequence of the present invention is as follows:
1 hot metal pretreatment
A equipment is hot metal pretreatment device body
General molten steel pretreatmenting container body: volume 17m
3Treatment capacity 25t; Treatment time 20-25min; Heat size is than 0.68; Treater height overall 4.5m; Oxygen-blowing gun position 600-800mm; Weight: box hat 20t, build magnesia carbon brick on furnace shell and various magnesia mould material 28t by laying bricks or stones, add up to gross weight 48t.Hot metal pretreatment device body and converter are basic identical, replace with converter or other stove.
Water cooled oxygen lance: length 7500mm adopts three hole de laval oxygen rifle M=1.85, body of a gun diameter of phi 133mm, oxygen flow 2400-2500m
3/ h, oxygen pressure 0.6-0.8Mpa, cooling water flow 〉=38t/h, the Inlet and outlet water temperature difference≤10 ℃.Join in the hot metal pretreatment device body blast-melted.
The b converting process: preprocessed molten iron amount general provision is 25 tons, and omnidistance oxygen-blowing gun position is controlled at 600-800mm; Half a minute is carried rifle to the 1000mm slag splashing before the blow off.Promptly add lime 270-340Kg after the following rifle oxygen blast igniting and (be weight of molten iron 1.08%-1.36%, the lime of hot metal charging weight 1.14%-1.26% according to circumstances, generally add 1.2% lime), the rifle position is controlled at 700-800mm, and oxygen is pressed 0.6-0.7Mpa blowing 5min.Open and blow 6-15min, the rifle position is adjusted into 600-700mm, looks reaction in furnace situation oxygen pressure-controlled at 0.6-0.8Mpa; Add lime 1000-1200Kg (for weight of molten iron 4.0%-4.8%) in three batches, rhombspar 200Kg (being weight of molten iron 0.8%-1.0%) adds rhombspar when first adds lime, add once every 5-6min.Two batches of slag charges add should guarantee that batch slag chargeization good (gentle in voice in the stove, ejecta is not with the iron sparkless, illustrates that promptly the slag fusing is good) is principle opportunity.Open and blow 16-20min, the oxygen pressure-controlled is about 0.6Mpa, and visual fusion slag flowability is added lime 200-300Kg (for weight of molten iron 0.8%-1.2%), rhombspar 100Kg (being weight of molten iron 0.35%-0.45%).Half a minute is carried rifle and carries out slag splashing to 1000mm before the blow off.Blowing promptly stopped oxygen blast in 20 minutes, and thermometric, sampling analysis molten iron composition reach requirement, can go out station.
The main chemical (weight part %) of general molten iron that iron work supplies is
C3.80-4.20 Si0.60-1.00 S≤0.070 P≤0.070
All the other are unavoidable impurities and Fe temperature 〉=1200 ℃.
The Chemical Composition of molten iron after the decarburization hyperthermic treatment (weight part %) is
C2.00-2.50 Si≤0.20 S≤0.050 P≤0.050
All the other are unavoidable impurities and Fe temperature 〉=1600 ℃.
2, be blended into electrosmelting
A electric furnace batching (weight part) is:
Preprocessed molten iron 25 common molten iron 18-25
Medium-sized light material steel scrap 23-28
General 1 part is 1 ton, and the electric furnace Intake Quantity is generally 70 tons.
B Electric furnace steel making batching is packed into earlier after a material basket (23-28 part) steel scrap directly is blended into after the decarburization hyperthermic treatment 25 parts of molten iron, send electric 3-5 minute, is blended into 18 parts of the untreated common molten iron of next jar again.
The c oxygen blast is smelted
Enter the water cooled oxygen lance oxygen blast from fire door, oxygen pressure is controlled at 0.6-0.7Mpa; Oxygen flow is 2400-2500m
3/ h.Smelt after 18-22 minute, temperature reaches 1640 ℃-1680 ℃, get the molten steel sample analysis, when molten steel composition reaches the kind regulation that electric furnace smelts, as after refining LZ50 (railroad industry axletree special-purpose steel) steel grade and reaching requirement, C 〉=0.30%, P≤0.015%, T=1640 ℃-1680 ℃, molten steel can be come out of the stove.
The present invention is when smelting, the preprocessed molten iron that adds preliminary desulfurization dephosphorization, increased the hot metal ratio in the electric furnace, reduce the molten steel inclusion content, increased the physics heat in the electric furnace stove, obviously shortened the time of furnace melting, impel the early stage slagging fast of electric furnace, the condition of having optimized electric furnace dephosphorization in early stage has realized that electric furnace whole process makes foam, has shortened the electrosmelting time significantly, thereby has significantly reduced the consumption of electric energy when smelting.The present invention respectively sees Table 1 at electric furnace smelting method in the contrast of throughput, tap to tap time and the main economic and technical indices in January, 04 to September in February, 05 to May and existing molten iron, table 2 and table 3.
Table 1
| During this time | Average monthly output (t) | Operating rate % | Electric furnace average tap to tap time (minute) | Monthly average stove number |
| Existing method | 24894.082 | 81.06 | 79 | 445 |
| The present invention | 31104.228 | 83.81 | 66 | 551 |
| Relatively | 6210.146 | 2.75 | -13 | 106 |
Table 2
| During this time | Fettling (minute) | Charging (minute) | Melting (minute) | Tapping (minute) | Altogether (minute) |
| Existing method | 5 | 12 | 41 | 21 | 79 |
| The present invention | 4 | 22 | 21 | 19 | 66 |
| Relatively | -1 | 10 | -20 | -2 | 13 |
Table 3
| Project | Unit | The present invention and existing method loss per ton steel are relatively | ||
| Before the transformation | After the transformation | Relatively | ||
| Lime | Kg/t | 90.685 | 87.794 | -2.891 |
| Fluorite | Kg/t | 4.405 | 2.81 | -1.595 |
| Φ 500mm electrode | Kg/t | 3.536 | 3.132 | -0.404 |
| Hot metal ladle refractory brick | Unit/t | 0.605 | 8.93 | 8.325 |
Embodiment
Describe the specific embodiment of the present invention in detail below in conjunction with embodiment, but the specific embodiment of the present invention is not limited to following embodiment.
Embodiment one
1 hot metal pretreatment
With the common molten iron of 24t, temperature is 1320 ℃, and major ingredient (weight %) is
C 3.80-4.20 Si 0.601.00 S≤0.070 P≤0.070
All the other are unavoidable impurities and Fe
Pour the molten long-pending 17m that is into
3The hot metal pretreatment device in, add 300 kilograms in lime, adopt Lavalle, the three holes water cooled oxygen lance of long 7500mm, with the pressure of 0.7Mpa, 2450m
3The flow of/h is blown into oxygen, adds lime 1000-1200 kilogram more in batches, and 200 kilograms of rhombspars, omnidistance cooling water flow are 40t/h, handles 20min, and the temperature of molten iron reaches 1650 ℃, when the composition of molten iron (%) reaches following the requirement by analysis
C 2.00-2.50 Si ≤0.20 S≤0.050 P≤0.050
All the other are unavoidable impurities and Fe, and promptly processing cost is invented said preprocessed molten iron.
2 are blended into electrosmelting
The a batching
The preprocessed molten iron 24t molten iron 22t that is untreated
Medium-sized light material steel scrap 23.7t
B is added to the medium-sized light material steel scrap of 23.7t in the electric furnace, directly adds the preprocessed molten iron of 24t, adds untreated molten iron 22t again, connects power supply and send.
The c oxygen blast is smelted
Entering water cooled oxygen lance from fire door, is 0.6Mpa with air pressure, and flow is 2450m
3Behind/h oxygen blast gas the 15min, thermometric is 1670 ℃, gets the analysis of molten steel sample, and composition reaches the regulation C=0.41% P=0.010% of the LZ50 steel grade of electric furnace refining, and the electric furnace molten steel is come out of the stove.
Claims (2)
1, the application method of a kind of preprocessed molten iron in Electric furnace steel making, its steps in sequence is as follows:
The I hot metal pretreatment
Join in the hot metal pretreatment device blast-melted, add the lime of weight of molten iron 1.08%-1.36%, with Lavalle, three holes water cooled oxygen lance, with the pressure of 0.6-0.8Mpa, flow 2400-2500m
3/ h is blown into oxygen 6-15min, the lime that in batches adds weight of molten iron 4.0%-4.8% again, the rhombspar of weight of molten iron 0.7%-0.85% is with the pressure continuation oxygen blast 16-20min of 0.6-0.8Mpa, the temperature of molten iron reaches more than 1600 ℃, when the composition of molten iron (%) reaches following the requirement by analysis
C 2.00-2.50 Si ≤0.20 S≤0.050
P≤0.050
All the other are unavoidable impurities and Fe, become decarburization intensification preprocessed molten iron;
II is blended into electrosmelting
A prepare burden (weight part)
Preprocessed molten iron 25 common molten iron 18-25
Medium-sized light material steel scrap 23-28
B is added to medium-sized light material steel scrap in the electric furnace, directly adds preprocessed molten iron, adds untreated molten iron again, connects power supply and send;
The c oxygen blast is smelted
Oxygen pressure is controlled at 0.6-0.7Mpa; Oxygen flow is 2400-2500m
3/ h smelted after 18-22 minute, and temperature reaches 1640 ℃-1680 ℃, gets the molten steel sample analysis, and when molten steel composition reached the kind regulation that electric furnace refines, molten steel was come out of the stove.
2, the application method of molten iron according to claim 1 in Electric furnace steel making, it is characterized in that: during hot metal pretreatment, after in the blast-melted hot metal pretreatment device that joins similar converter, add the lime of weight of molten iron 1.14%-1.26%, use the water cooled oxygen lance oxygen blast of Lavalle, three holes again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100482734A CN100350058C (en) | 2005-12-30 | 2005-12-30 | Application of preprocessed molten iron in electric steelmaking |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100482734A CN100350058C (en) | 2005-12-30 | 2005-12-30 | Application of preprocessed molten iron in electric steelmaking |
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| CN1804050A CN1804050A (en) | 2006-07-19 |
| CN100350058C true CN100350058C (en) | 2007-11-21 |
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| CN101962699A (en) * | 2010-10-30 | 2011-02-02 | 山西太钢不锈钢股份有限公司 | High-iron proportion steel-making method of electric furnace with eccentric bottom |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5594410A (en) * | 1979-01-13 | 1980-07-17 | Nippon Steel Corp | Continuous molten iron pretreating method |
| JPH03274216A (en) * | 1990-03-23 | 1991-12-05 | Nkk Corp | Dephosphorize pre-treating method for molten iron |
| JPH0741824A (en) * | 1991-08-21 | 1995-02-10 | Kawasaki Steel Corp | Production of high cleanliness steel |
| CN1470653A (en) * | 2003-07-04 | 2004-01-28 | 钢铁研究总院 | Converter steelmaking process |
-
2005
- 2005-12-30 CN CNB2005100482734A patent/CN100350058C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5594410A (en) * | 1979-01-13 | 1980-07-17 | Nippon Steel Corp | Continuous molten iron pretreating method |
| JPH03274216A (en) * | 1990-03-23 | 1991-12-05 | Nkk Corp | Dephosphorize pre-treating method for molten iron |
| JPH0741824A (en) * | 1991-08-21 | 1995-02-10 | Kawasaki Steel Corp | Production of high cleanliness steel |
| CN1470653A (en) * | 2003-07-04 | 2004-01-28 | 钢铁研究总院 | Converter steelmaking process |
Non-Patent Citations (1)
| Title |
|---|
| 顶底吹氧气转炉使用预处理铁水生产纯净钢 郭新春.钢铁钒钛，第1期 1985 * |
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Owner name: SHANXI TAIGANG STAINLESS STEEL CO., LTD. Free format text: FORMER OWNER: TAIYUAN IRON AND STEEL (GROUP) CO LTD Effective date: 20070629 |
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Effective date of registration: 20070629 Address after: 030003 No. 2 lawn street, Taiyuan, Shanxi Applicant after: Shanxi Taigang Stainless Steel Co., Ltd. Address before: 030003 No. 2, sharp lawn, Taiyuan City, Shanxi Province Applicant before: Taiyuan Iron & Steel (Group) Co., Ltd. |
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