CN1789431A - Method for reclaiming residue steel and slag of molten steel container - Google Patents
Method for reclaiming residue steel and slag of molten steel container Download PDFInfo
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- CN1789431A CN1789431A CNA2005100225773A CN200510022577A CN1789431A CN 1789431 A CN1789431 A CN 1789431A CN A2005100225773 A CNA2005100225773 A CN A2005100225773A CN 200510022577 A CN200510022577 A CN 200510022577A CN 1789431 A CN1789431 A CN 1789431A
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- ladle
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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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- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
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- Treatment Of Steel In Its Molten State (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses the recovery method of waste steel and residue, comprising the following steps: after tapping the ladle, decanting the waste steel and residue into foundry ladle, mixing them with the iron melt which is already in the foundry ladle, stirring, and then entering the mixture into the electric-arc steel furnace or converter. The advantages of the method are following: saving the raw material and energy resource and eliminating the pollution; improving the manufacturing environment of workplace and depressing the intensity of labor; increasing the purity of continuous casting molten steel.
Description
Technical field
The invention belongs to metallurgical technology field, relate to a kind of steel-making surplus steel of ladle and method that waste residue is made steel utilized, also relate to a kind of recoverying and utilizing method of making steel surplus steel and recrement in the ladle simultaneously.
Background technology
The ladle external refining is a steel-smelting technology that generally adopts, for the deoxidation of molten steel, desulfurization etc., must use a large amount of high basicity slags, wherein slag amount is generally greater than 15 kilograms of/ton steel, and the calcium oxide in the slag (following also can be called for short " CaO ") content is generally greater than 45%.Certainly also contain other compound in the ladle slag, as magnesium oxide (MgO), aluminium sesquioxide (Al
2O
3), silicon oxide (SiO
2) and a spot of ferric oxide (FeO) and manganese oxide (MnO) etc.In order to improve the quality of continuous casting steel billet, in the casting process of steel-making, must strict control ladle slag enter tundish, avoid the pollution of ladle slag to molten steel, for this reason, when molten steel flows into tundish, must leave a certain amount of surplus steel in the ladle, the density that prevents the covering of molten steel face is less, and slag flows into tundish with molten steel, influences the purity of continuous casting molten steel.In actual production, the requirement for height of general surplus molten steel must be greater than 100 millimeters, and with respect to 100 tons ladle, all the other steel amounts then can reach more than 2 tons.Usually, after the ladle tapping finishes, surplus steel and slag in the ladle will be introduced in the slag ladle, transport steelshop, then by certain slag treatment technology, the steel in the slag ladle be separated with slag.After Yu Gang presses the certain size cutting, add in the steel melting furnace and melt down; Slag is used to make material of construction or is used to repair the roads, fill out sea etc. then after treatment.Yet, after the slag sub-argument, generally still have a large amount of surplus steel to remain in the slag, these residual steel particles not only influence the utilization of slag as material of construction, but also have wasted a large amount of iron resourcess; Simultaneously, because the slag of ladle refining furnace has reductibility, wherein contain a large amount of free calcium oxides, can expand by nature at slag ladle and spoil area, make original blocky slag efflorescence, therefore, easily cause the environmental pollution of waste residue transportation, stacking process or slag treating processes, compare with the oxidisability slag, handle more difficultly, and two, three times seriously polluted.In the existing steel-smelting technology, owing to still can not carry out fully effectively recycling to surplus steel and recrement, this have not only caused the waste of a large amount of energy and resource in the steelmaking process, but also can cause certain pollution to environment.
Summary of the invention
The object of the present invention is to provide a kind of recovery method of making steel surplus steel of ladle and recrement, it can be recycled the surplus steel and the recrement that produce in the steelmaking process once more, thereby reaches energy-saving and cost-reducing, reduce pollution effects.
Further purpose of the present invention is to provide a kind of recovery method of making steel surplus steel of ladle and recrement, and it can make iron liquid in the base iron bag and the surplus steel of initiate ladle and slag thorough mixing easily.
For realizing purpose of the present invention, a kind of recovery method of making steel surplus steel of ladle and recrement, in steelmaking process, after the ladle tapping finishes, all pour into liquid surplus steel and recrement remaining in the ladle in the hot metal ladle, and making molten iron and molten iron slag thorough mixing in initiate surplus steel and recrement and the base iron bag by stirring, hot metal ladle is blended in electric furnace arrangement for producing steel or the converter after stir process again.
For realizing further purpose of the present invention, a kind of recovery method of making steel surplus steel of ladle and recrement also comprises: be that mode by induction stirring realizes mixing between molten iron in described initiate surplus steel and recrement and the base iron bag and the molten iron slag.
Advantage of the present invention is: by direct recovery and the utilization to surplus steel and recrement in the ladle, can reach the effect that saves material with the energy, and can thoroughly eliminate the pollution of slag to environment; Simultaneously, because no slag ladle in the workshop also can improve the production environment and the working strength of workers in workshop; In addition, owing in casting process, can allow the surplus steel of more ladle, therefore also help to improve the purity of continuous casting molten steel.
Description of drawings
Be described in further detail in conjunction with the accompanying drawings the present invention being made steel the recovery method of surplus steel of ladle and recrement down:
Synoptic diagram when Fig. 1 pours surplus steel and recrement into hot metal ladle for the present invention makes steel in the recovery method of surplus steel of ladle and recrement;
Fig. 2 makes steel the synoptic diagram of the induction stirring in the recovery method of surplus steel of ladle and recrement for the present invention;
Fig. 3 makes steel the synoptic diagram of the another kind of induction stirring in the recovery method of surplus steel of ladle and recrement for the present invention;
Surplus steel and recrement are poured the synoptic diagram that hot metal ladle and hot metal ladle induction stirring are carried out simultaneously in Fig. 4 ladle of the present invention;
Fig. 5 adopts churned mechanically synoptic diagram in the inventive method;
Fig. 6 pours the synoptic diagram that hot metal ladle and hot metal ladle mechanical stirring are carried out simultaneously into for surplus steel in the ladle of the present invention and recrement;
Fig. 7 is induction stirring and mechanical stirring structure combining synoptic diagram in the hot metal ladle of the present invention;
Fig. 8 eliminates the synoptic diagram of solidified shell for adopting blow oxygen in the hot metal ladle of the present invention.
Among the figure: 1, ladle, 2, ladle lid, 3, recrement, 4, Yu Gang, 5, molten iron, 6, hot metal ladle, 7, the molten iron slag, 8, solidified shell, 9, electromagnetic mixing apparatus, 10, mechanical stirring device, 11, stirring arm, 12, oxygen lance, 13, oxygen.
Embodiment
The recovery method of surplus steel of steel-making ladle of the present invention and recrement, its primary process is: in steelmaking process, after treating that the ladle tapping finishes, all pour into liquid recrement in the ladle and Yu Gang in the hot metal ladle, adopt methods such as induction stirring, mechanical stirring then, make molten iron and molten iron slag and surplus steel of initiate ladle and recrement thorough mixing in the base iron bag, in steelshop, on the spot, directly and fully high basicity slag of liquid state and the surplus steel of ladle are recycled.Because the fusing point of molten iron is lower, generally below 1350 ℃, and the fusing point that newly adds the surplus steel of ladle is higher, generally more than 1450 ℃, after surplus steel of ladle and recrement adding, just can on the molten iron liquid level of hot metal ladle, form one deck solidified shell, therefore, must adopt stirring method just can make molten iron and molten iron slag and surplus steel of initiate ladle and recrement thorough mixing in the base iron bag.Initiate high basicity liquid slag under agitation condition with the base iron bag in the molten iron slag mix mutually, changed the slag composition on the molten iron liquid level, basicity in the molten iron slag improves, and makes it obtain the thermodynamic condition that carries out desulfurization greater than 0.04% molten iron for sulphur content; During desulfurization, calcium oxide in the slag and the reaction of Salmon-Saxl in the molten iron generate more stable sulfurated lime, and enter the slag phase.Under good agitation condition, molten iron fully contacts with slag, and the dynamic conditions of desulfurizing iron is also abundant.Hot metal ladle is blended in electric furnace arrangement for producing steel or the converter after stir process again, just can make recrement and Yu Gang in the liquid ladle all be recovered utilization.Because surplus steel can all be recycled, therefore, in the ladle tapping process, Yu Gangliang can control by the upper limit, allows to leave more surplus steel, so just can help improving the purity of continuous casting molten steel.
Embodiment one
As shown in Figure 1, a kind of recovery method of making steel surplus steel of ladle and recrement is when steel-making, after ladle 1 tapping finishes, be moved to hot metal ladle 6 places that have molten iron 5 immediately, remove ladle lid 2 then, the ladle 1 of tumbling immediately is poured into liquid recrement 3 and Yu Gang 4 in the ladle 1 in the hot metal ladle 6 together.Because the temperature of molten iron 5 is lower in the hot metal ladle 6, and surplus steel 4 fusing points of unmixed are higher, therefore, on molten iron 5 liquid levels of hot metal ladle 6, will form one deck solidified shell 8, thereby influence mixing between original molten iron 5 in initiate surplus steel 4 and recrement 3 and the hot metal ladle 6 and the molten iron slag 7.
In the present embodiment, for make initiate surplus steel 4 and recrement 3 can with original molten iron 5 in the hot metal ladle 6 and molten iron slag 7 thorough mixing, can adopt the method for induction stirring that it is fully stirred, as shown in Figure 2, adopt an external placed type linear electromagnetic whipping appts 9 to be arranged on the outside of hot metal ladle 6, molten iron 5 in hot metal ladle 6 applies an electromagnetic field, under the effect of electromagnetic force, can make the molten iron 5 in the hot metal ladle 6 form circulation up and down.As shown in Figure 3, also can adopt the molten iron 5 in 9 pairs of hot metal ladle of electromagnetic mixing apparatus 6 to apply an electromagnetic field effect that horizontally rotates, under the promotion of magnetic field force, make the molten iron 6 in the hot metal ladle 6 horizontally rotate motion.Certainly, also can make electromagnetic mixing apparatus 9 molten iron in the hot metal ladle 65 be applied electromagnetic field effect power, make molten iron 5 mix motion by specific pattern by other mode.Under the abundant effect of electromagnetic force, molten iron 5 in the hot metal ladle 6 is well stirred and thorough mixing, solidified shell 8 on base iron 5 liquid levels owing to fusing point reduces and dissolving disappearance rapidly, thereby can make molten iron 5 and molten iron slag 7 thorough mixing in initiate surplus steel 4 and recrement 3 and the base iron bag 6.
In the present embodiment, after ladle 1 tapping finishes, the time marquis who all pours liquid surplus steel 4 remaining in the ladle 1 and recrement 3 into hot metal ladle, also can adopt induction stirring simultaneously, to improve the efficient of induction stirring, initiate molten steel and slag are more promptly mixed with molten iron and molten iron slag in the base iron bag, and concrete structure as shown in Figure 4.
Embodiment two
The present invention also can adopt the mechanical mixing method of hot metal ladle, when ladle 1 tapping finishes, and after having poured the liquid recrement 3 in the ladle 1 and Yu Gang 4 into hot metal ladle 6 together, adopt mechanical stirring device to stir again, make original molten iron 5 and molten iron slag 7 thorough mixing in initiate surplus steel 4 and recrement 3 and the hot metal ladle 6.As shown in Figure 5, mechanical stirring device 10 stirs iron liquid from hot metal ladle 6 tops are immersed in a stirring arm 11 of being made by refractory materials the molten iron 5 of certain depth the hot metal ladle 6, make iron liquid be rotated motion.Under the effect of stirring arm 11, iron liquid is well stirred, and thorough mixing, the solidified shell 8 on base iron 5 liquid levels because fusing point reduces, disappears and dissolve rapidly.
Certainly, in the present embodiment, the two carries out method of operating simultaneously also can to adopt hot metal ladle 6 mechanical stirring and liquid recrement 3 and Yu Gang 4 to pour hot metal ladle 6 into, promptly, when in hot metal ladle 6, pouring recrement 3 and Yu Gang 4 into, carry out mechanical stirring, thereby improve stirring efficiency and mixing velocity thereof, as shown in Figure 6.
Embodiment three
In the recovery method of invention surplus steel of described steel-making ladle and recrement, the also method that can adopt hot metal ladle induction stirring and mechanical stirring to combine, as shown in Figure 7, the bottom of hot metal ladle 6 is provided with electromagnetic mixing apparatus 9, top is provided with mechanical stirring device 10, with this stirring of strengthening molten iron 5 and slag with mix.Can before stirring arm 11 inserts molten iron 5 stirrings, stir with electromagnetic mixing apparatus 9 earlier, weaken the solidified shell 8 of molten iron 5 liquid levels, and then strengthen the mixing of molten iron 5 and molten iron slag 7 with mechanical stirring device 10.
In addition, among the present invention, also can adopt the oxygen blown method of molten iron 5 liquid levels in hot metal ladle 6, eliminate molten iron 5 liquid levels middle part solidified shell 8 fast.As shown in Figure 8, the oxygen lance 12 of water-cooled or deflection type is reduced to the middle part of the solidified shell 8 of molten iron 5 liquid levels from hot metal ladle 6 tops, be blown into oxygen 13, utilize the heat that the reaction of carbon and chemistry of silicones produces in oxygen and the molten iron 5 to make this solidified shell 8 fusings, and under the promotion of Oxygen Flow, the solidified shell 8 at molten iron 5 liquid levels middle part is rapidly disappeared.This technology can be used with the hot metal ladle mechanical mixing method, and the solidified shell 8 on the molten iron liquid level is thicker, when stirring arm 11 can not be inserted in the molten iron 5 smoothly, can use this technology, eliminates the solidified shell 8 at molten iron 5 liquid levels middle part fast.
Except that adopting blow oxygen to eliminate the method for solidified shell, also can adopt other mechanical means to eliminate the solidified shell of molten iron liquid level in the present invention.As adopt mechanical force to smash solidified shell, make the stirring arm 11 of mechanical stirring device 10 can insert iron liquid inside smoothly and stir.
In the various embodiments described above, for fusing point and the flowability that reduces slag, can be before ladle slag be poured hot metal ladle 6 into or ladle slag pour into and add some additives in hot metal ladle 6 processes, as iron scale, the dust-removing powder of continuous casting and steel rolling, Calcium Fluoride (Fluorspan) and soda powder etc.After adding Calcium Fluoride (Fluorspan) and soda powder, can reduce the fusing point of slag, and can improve the sweetening power of slag; Add and contain ferric oxide more steel rolling iron scale and dedusting ash, the carbon in the iron liquid will restore ferric oxide, add iron scale or dedusting ash, not only can improve the flowing property of slag, but also the iron in the recyclable additive.
Claims (8)
1, a kind of recovery method of making steel surplus steel of ladle and recrement, in steelmaking process, after ladle (1) tapping finishes, last liquid surplus steel (4) and recrement (3) in the ladle (1) all poured in the hot metal ladle (6), and make molten iron (5) and molten iron slag (7) thorough mixing in initiate surplus steel (4) and recrement (3) and the base iron bag (6) by stirring, molten iron (5) in the hot metal ladle (6) is blended in electric furnace arrangement for producing steel or the converter after stir process again.
2, a kind of recovery method of making steel surplus steel of ladle and recrement according to claim 1, it is characterized in that: after described ladle (1) tapping finishes, earlier liquid surplus steel (4) and recrement (3) remaining in the ladle (1) are all poured in the hot metal ladle (6), and then made molten iron (5) and molten iron slag (7) thorough mixing in initiate surplus steel (4) and recrement (3) and the base iron bag (6) by stirring.
3, a kind of recovery method of making steel surplus steel of ladle and recrement according to claim 1, it is characterized in that: after described ladle (1) tapping finishes, when all pouring liquid surplus steel (4) remaining in the ladle (1) and recrement (3) into hot metal ladle (6), make molten iron (5) and molten iron slag (7) thorough mixing in initiate surplus steel (4) and recrement (3) and the base iron bag (6) by stirring.
4, according to claim 1,2 or 3 described a kind of recovery methods of making steel surplus steel of ladle and recrement, it is characterized in that: be that mode by induction stirring realizes mixing between molten iron (5) in surplus steel of described new adding (4) and recrement (3) and the base iron bag (6) and the molten iron slag (7).
5, according to claim 1,2 or 3 described a kind of recovery methods of making steel surplus steel of ladle and recrement, it is characterized in that.Mixing between molten iron (5) in described new adding surplus steel (4) molten steel and recrement (3) and the base iron bag (6) and the molten iron slag (7) is that the mode by mechanical stirring (non-electromagnetism) realizes.
6, a kind of recovery method of making steel surplus steel of ladle and recrement according to claim 5, it is characterized in that: before mechanical stirring, adopt oxygen lance (12) to hot metal ladle (6) middle part oxygen blast earlier, carbon and silicon generation chemical reaction by oxygen (13) and molten iron (5) liquid level also produces heat, the solidified shell (8) on iron liquid surface is melted, and then use the stirring arm (11) of mechanical stirring device (10) to probe into iron liquid and stir.
7, according to claim 1,2 or 3 described a kind of recovery methods of making steel surplus steel of ladle and recrement, it is characterized in that: molten iron (5) in surplus steel of described new adding (4) and recrement (3) and the base iron bag (6) and the mixing between the molten iron slag (7) are to realize by the mode that induction stirring and mechanical stirring combine.
8, a kind of recovery method of making steel surplus steel of ladle and recrement according to claim 1, it is characterized in that: remaining liquid surplus steel (4) and recrement (3) are poured hot metal ladle (6) into before or in the process in described ladle (1), can add some additives therein, as iron scale, the dust-removing powder of continuous casting and steel rolling, Calcium Fluoride (Fluorspan) and soda powder etc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100225773A CN1789431A (en) | 2005-12-10 | 2005-12-10 | Method for reclaiming residue steel and slag of molten steel container |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100225773A CN1789431A (en) | 2005-12-10 | 2005-12-10 | Method for reclaiming residue steel and slag of molten steel container |
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| CN1789431A true CN1789431A (en) | 2006-06-21 |
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| CNA2005100225773A Pending CN1789431A (en) | 2005-12-10 | 2005-12-10 | Method for reclaiming residue steel and slag of molten steel container |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101239384B (en) * | 2007-02-06 | 2010-05-19 | 宝山钢铁股份有限公司 | Separation method of casting residue and molten steel |
| CN101956043A (en) * | 2010-10-13 | 2011-01-26 | 山西太钢不锈钢股份有限公司 | Method for recycling steelmaking slag |
| CN102896310A (en) * | 2012-10-23 | 2013-01-30 | 鞍钢股份有限公司 | Method for separating and recycling casting residues |
| CN104726629A (en) * | 2013-12-20 | 2015-06-24 | Posco公司 | Method and apparatus for manufacturing molten iron |
| CN105087853A (en) * | 2015-09-21 | 2015-11-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for steel-making and slagging of semi-steel in converter |
| CN108842020A (en) * | 2018-07-05 | 2018-11-20 | 山西太钢不锈钢股份有限公司 | For the pretreated sulfur method of molten iron |
| CN109112252A (en) * | 2018-10-05 | 2019-01-01 | 若羌县圣地石棉尾料再利用科技开发有限公司 | A kind of method that electric furnace utilizes smelting of metal particle ferroalloy and special steel |
| CN109280739A (en) * | 2018-11-21 | 2019-01-29 | 达力普石油专用管有限公司 | A method of promoting electric furnace molten steel recovery rate |
| CN109852764A (en) * | 2019-04-01 | 2019-06-07 | 山东钢铁集团日照有限公司 | A kind of LF refining top slag thermal state utilization method |
| CN112251549A (en) * | 2020-11-26 | 2021-01-22 | 南京鹏昆环保科技有限公司 | Slag smelting furnace for separating molten steel and steel slag and separation method |
| CN113102712A (en) * | 2021-04-15 | 2021-07-13 | 马鞍山钢铁股份有限公司 | Steel ladle casting residue recycling method suitable for ultra-low carbon steel |
-
2005
- 2005-12-10 CN CNA2005100225773A patent/CN1789431A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101239384B (en) * | 2007-02-06 | 2010-05-19 | 宝山钢铁股份有限公司 | Separation method of casting residue and molten steel |
| CN101956043A (en) * | 2010-10-13 | 2011-01-26 | 山西太钢不锈钢股份有限公司 | Method for recycling steelmaking slag |
| CN102896310A (en) * | 2012-10-23 | 2013-01-30 | 鞍钢股份有限公司 | Method for separating and recycling casting residues |
| CN102896310B (en) * | 2012-10-23 | 2015-11-18 | 鞍钢股份有限公司 | Method for separating and recycling casting residues |
| CN104726629A (en) * | 2013-12-20 | 2015-06-24 | Posco公司 | Method and apparatus for manufacturing molten iron |
| CN105087853A (en) * | 2015-09-21 | 2015-11-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for steel-making and slagging of semi-steel in converter |
| CN108842020A (en) * | 2018-07-05 | 2018-11-20 | 山西太钢不锈钢股份有限公司 | For the pretreated sulfur method of molten iron |
| CN109112252A (en) * | 2018-10-05 | 2019-01-01 | 若羌县圣地石棉尾料再利用科技开发有限公司 | A kind of method that electric furnace utilizes smelting of metal particle ferroalloy and special steel |
| CN109280739A (en) * | 2018-11-21 | 2019-01-29 | 达力普石油专用管有限公司 | A method of promoting electric furnace molten steel recovery rate |
| CN109280739B (en) * | 2018-11-21 | 2020-10-02 | 达力普石油专用管有限公司 | Method for improving molten steel yield of electric furnace |
| CN109852764A (en) * | 2019-04-01 | 2019-06-07 | 山东钢铁集团日照有限公司 | A kind of LF refining top slag thermal state utilization method |
| CN112251549A (en) * | 2020-11-26 | 2021-01-22 | 南京鹏昆环保科技有限公司 | Slag smelting furnace for separating molten steel and steel slag and separation method |
| CN113102712A (en) * | 2021-04-15 | 2021-07-13 | 马鞍山钢铁股份有限公司 | Steel ladle casting residue recycling method suitable for ultra-low carbon steel |
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