CN109609721B - A kind of method that converter recycles the hot casting residue of ladle - Google Patents
A kind of method that converter recycles the hot casting residue of ladle Download PDFInfo
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- CN109609721B CN109609721B CN201811557461.3A CN201811557461A CN109609721B CN 109609721 B CN109609721 B CN 109609721B CN 201811557461 A CN201811557461 A CN 201811557461A CN 109609721 B CN109609721 B CN 109609721B
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- hot
- slag
- casting residue
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- steel
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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
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/44—Refractory linings
- C21C5/441—Equipment used for making or repairing linings
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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
- C21C5/28—Manufacture of steel in the converter
- C21C5/36—Processes yielding slags of special composition
-
- 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
- C21C2200/00—Recycling of waste material
Abstract
The invention discloses a kind of methods that converter recycles the hot casting residue of ladle, belong to technical field of ferrous metallurgy, solve the problems, such as that casting residue in the prior art and its own waste heat can not efficiently use.The method of the present invention includes following steps: the hot casting residue remained in ladle after molten steel is cast returns to pneumatic steelmaking process and carries out recycling；The basicity of hot casting residue is 6~8.Method energy-saving and environmental protection of the invention effectively, steadily realize that casting residue is hot to be recycled using the casting residue of liquid continuous casting, it can reduce steel technology, efficiently use clinker sensible heat, improve efficiency, STEELMAKING PRODUCTION cost is reduced, it is obvious to improve steel quality, environmental benefit.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, recycle the hot casting residue of ladle more particularly to a kind of converter
Method.
Background technique
The substance that molten steel remains in ladle after casting is referred to as casting residue.
In the prior art, usually casting residue is directly ploughed under in slag ladle, is fetched water after being cooled to room temperature, carry out the separation of slag steel,
Bulk slag steel, which sorts out, returns to steel making working procedure progress secondary smelting；It separates steel slag and carries out magnetic separation, magneticly elect that carry out steel slag same
Sample enters steel making working procedure and uses as the metal material smelted, and remaining tailings is retained stand-by.
But limitation existing for the above method, the period of the processing such as cooling, broken, steel slag separation, magnetic separation is long, cold
But it needs to spray a large amount of water during, and without thermal energy in effective use slag, causes the waste of the energy.Meanwhile it handling scene and holding
It is also easy to produce a large amount of steam and dust, seriously affects ambient enviroment.Further, since not only polluted in treated tailings environment,
A large amount of soils are occupied, and contain a large amount of free calcium oxides and free magnesium, are unable to get good utilization.
Currently, the casting residue circulation Jing Guo LF refining process is ploughed under preparation by part steel mill is again introduced into LF refining process
It in ladle, is produced, remaining molten steel not only can be made full use of subsequently into LF refining process, additionally it is possible to benefit
Part LF furnace technology slag making materials are substituted with high alkalinity clinker, save portion of flux cost.But the above method, it needs to reinforce
The control precision of molten steel tank emptying retains certain space and volume for the steel slag of recycling, also, more for refinery practice type
Steel mill, applicability is not strong, and the utilization rate of casting residue is not high, organization of production, steel-making smelt, rhythm of production control require it is special
Setting, can not form normalization orderly management and popularization.Simultaneously as casting residue sulfur capacity limits LF refining close to saturation
The further desulfurization of process, and casting residue accumulation necessarily leads to discarded phenomenon to a certain extent.
Alternatively, part steel mill is using casting residue as converter semisteel smelting fluxing agent, still, since there is still a need for match for semisteel smelting
Plus acidic slag former carries out slag making, and semisteel smelting shortage of heat itself, and the cold conditions fluxing agent and slag former of addition melt heat absorption,
Smelting molten steel peroxidating is exacerbated, steel technology is high, and oxide is mingled with increase in steel.
Summary of the invention
In view of above-mentioned analysis, the present invention is intended to provide a kind of method that converter recycles the hot casting residue of ladle, solution
The problem of certainly casting residue and its own waste heat can not efficiently use in the prior art.
The purpose of the present invention is mainly achieved through the following technical solutions:
The present invention provides a kind of method that converter recycles the hot casting residue of ladle, include the following steps: molten steel
The hot casting residue remained in ladle after casting returns to pneumatic steelmaking process and carries out recycling；Hot casting residue
Basicity be 6~8.
In a kind of possible design, the above method includes the following steps:
Step 1: after converter tapping, vessel slag being carried out to splash slag in converter, vessel slag, which splashes to do, all to be stayed in converter, position
In the furnace bottom and furnace lining of converter；
Step 2: operation of skimming is carried out after pre-processing in hot-metal bottle to desulfurizing iron, by hot casting residue and after skimming
Molten iron mixing is blended into converter, carries out converter smelting.
It in a kind of possible design, in step 1, after converter tapping, splashes before slag, magnesium ball is added into vessel slag,
The mass ratio of magnesium ball and steel is 2.0~4.2kg/t.
In a kind of possible design, the chemical composition mass percent of magnesium ball includes: MgO >=70%, CaO≤1.5%,
SiO2≤ 5%, loss on ignition≤25%, the partial size of magnesium ball is 20~60mm.
In a kind of possible design, splashing the slag time is 3~5min.
In a kind of possible design, step 2 includes the following steps: to carry out after pre-processing desulfurizing iron in hot-metal bottle
Take off slag operation；Hot-metal bottle is transported to molten steel after furnace to receive across the ladle equipped with hot casting residue to be hoisted to the charging of hot-metal bottle
It at mouthful and pours into molten iron surface, then hot-metal ladle and carriage is shipped back molten iron and is received across molten iron is blended into converter and carries out converter smelting.
In a kind of possible design, in step 2, after skimming, the reserved head room > 300mm of hot-metal bottle.
In a kind of possible design, in step 2, converter smelting is carried out using single slag or double slag techniques.
In a kind of possible design, in step 2, converter smelting, the lime in smelting process are carried out using single slag technique
Adding manner are as follows: in 0~3min of initial smelting period, be added without lime；3min is to once stone is added in furnace, point 3~5 batches
Ash, the lime adding amount of every batch of are 5~15kg/t steel；It once falls after furnace, the lime adding amount filled into is 5~10kg/t
Steel.
In a kind of possible design, in step 2, converter smelting, the lime in smelting process are carried out using double slag techniques
Adding manner are as follows: in 0~3min of initial smelting period, be added without lime；A batch lime, stone is added to intermediate slag in 3min
The additional amount of ash is 5~15kg/t steel；Slag is fallen to once lime is added in furnace, point 2~4 batches in centre, and the lime of every batch of adds
Entering amount is 5~15kg/t steel, is once fallen after furnace, the lime adding amount filled into is 5~10kg/t steel.
Compared with prior art, the present invention has the beneficial effect that:
A) method that converter provided by the invention recycles the hot casting residue of ladle, energy-saving and environmental protection, effectively, steadily
It realizes that casting residue is hot to be recycled using the casting residue of liquid continuous casting, can reduce steel technology, efficiently use clinker
Sensible heat improves efficiency, reduces STEELMAKING PRODUCTION cost, and it is obvious to improve steel quality, environmental benefit.
B) method that converter provided by the invention recycles the hot casting residue of ladle, casting residue mainly include the steel of recycling
The carbonization rice husk layer of water, recrement and recrement surface, wherein the molten steel of recycling accounts for about overall weight 40~50%；Recrement accounts for about
The 35~45% of overall weight, main chemical compositions CaO, Al2O3、MgO、P2O5And SiO2Deng generally with affinability；Carbon
Change rice husk layer and accounts for about the 5~10% of overall weight.By recycling the hot casting residue of ladle, weight in hot casting residue is accounted for
40~50% molten steel recycles, and reduces steel technology, reduces production cost.The slag temperature of hot casting residue is reachable
1000 DEG C or more, sensible heat with higher can effectively utilize clinker sensible heat, reduce oxygen consumption in pneumatic steelmaking process, and
And the main component fixed carbon in carbonization rice husk has concurrent heating effect to be conducive to converter to be rapidly heated slugging by burning, hot casting
Recrement belongs to pre-melted slag, improves slugging early period efficiency.P in hot casting residue2O5And SiO2It is partially reduced, and clinker has
There are high alkalinity, high phosphorus to hold, lime consumption can be reduced and be conducive to dephosphorization in converter, while the Al that casting residue contains2O3, be conducive to
Initial smelting period rapid slagging, the FeO content in casting residue is low generally between 0.05%~0.17%, basicity generally 6~8,
Casting residue, which can increase the quantity of slag these conditions, simultaneously may advantageously facilitate the progress of desulphurization reaction.Meanwhile the above method is realized substantially
The complete alternation of ladle hot casting residue utilizes, in casting residue in free calcium oxide and free magnesium and molten iron silicon through peroxidating
The SiO of generation2Reaction generates the slag making materials such as calcium silicates and monticellite, alleviates waste sludge discharge environmental pressure and handling
With environmental benefit is obvious.
C) method that converter provided by the invention recycles the hot casting residue of ladle, since the basicity of casting residue is (general
It is 6~8) it is usually above the basicity (2.8~3.5 or so) of converter smelting, the casting residue of high alkalinity is conducive to the dephosphorization rate of converter
With the raising of desulfurization degree；Secondly, casting residue be pre-melted slag, initial smelting period can rapid slagging removing molten iron in [P] and [S]；
Meanwhile recycling for hot casting residue increases the converter slag-making quantity of slag, is also conducive to the raising of converter dephosphorization rate and desulfurization degree.
D) in the prior art, casting residue is returned into LF refining process, LF refining process has bottom to mix heated by electrodes process, right
The headroom control precision of ladle wants strict control to prevent molten steel from overflowing and keeping subsequent and pours stabilization.And the present invention is by casting residue
Pneumatic steelmaking process is returned to, hot-metal bottle does not have bottom blowing stirring, requires opposite decrease to the headroom control of hot-metal bottle.
E) method that converter provided by the invention recycles the hot casting residue of ladle is only the circulation for changing casting residue
Land use systems do not need to be transformed to existing weaponry and equipment, have preferable market application prospect.
Other features and advantages of the present invention will illustrate in the following description, also, partial become from specification
It obtains it is clear that understand through the implementation of the invention.The objectives and other advantages of the invention can be by written explanation
Specifically noted structure is achieved and obtained in book, claims and attached drawing.
Detailed description of the invention
Attached drawing is only used for showing the purpose of specific embodiment, and is not to be construed as limiting the invention, in entire attached drawing
In, identical reference symbol indicates identical component.
Fig. 1 is the flow diagram for the method that converter of the invention recycles the hot casting residue of ladle.
Specific embodiment
Specifically describing the preferred embodiment of the present invention with reference to the accompanying drawing, wherein attached drawing constitutes the application a part, and
Together with embodiments of the present invention for illustrating the principle of the present invention.
The present invention provides a kind of methods that converter recycles the hot casting residue of ladle, walk referring to Fig. 1, including as follows
Rapid: the hot casting residue remained in ladle after molten steel is cast returns to pneumatic steelmaking process and carries out recycling；
The mass percent of hot casting residue ingredient includes: the molten steel 40~50%, recrement 35~45% and recrement surface of recycling
Carbonization rice husk layer 5~10%；The basicity of hot casting residue is 6~8.
Compared with prior art, the method that converter provided by the invention recycles the hot casting residue of ladle, energy conservation, ring
It protects, effectively, steadily realize using the casting residue of liquid continuous casting that casting residue is hot to be recycled, can reduce iron and steel stock and disappear
Consumption efficiently uses clinker sensible heat, improves efficiency, reduces STEELMAKING PRODUCTION cost, and it is obvious to improve steel quality, environmental benefit.
Specifically, casting residue mainly includes molten steel, recrement and the carbonization rice husk layer on recrement surface of recycling, wherein
The molten steel of recycling accounts for about overall weight 40~50%；Recrement accounts for about the 35~45% of overall weight, main chemical compositions CaO,
Al2O3、MgO、P2O5And SiO2Deng generally with affinability；Carbonization rice husk layer accounts for about the 5~10% of overall weight.By following
Ring utilizes the hot casting residue of ladle, and the molten steel that weight in hot casting residue accounts for 40~50% is recycled, iron and steel stock is reduced
Consumption, reduces production cost.For the slag temperature of hot casting residue up to 1000 DEG C or more, sensible heat with higher can effective benefit
With clinker sensible heat, reduce oxygen consumption in pneumatic steelmaking process, also, the main component fixed carbon in carbonization rice husk is by burning
There is concurrent heating effect to be conducive to converter to be rapidly heated slugging, hot casting residue belongs to pre-melted slag, improves slugging early period efficiency.Hot casting
P in recrement2O5And SiO2It is partially reduced, and there is clinker high alkalinity, high phosphorus to hold, and can reduce lime consumption and be conducive to
Dephosphorization in converter, while the Al that casting residue contains2O3, be conducive to initial smelting period rapid slagging, the FeO content low one in casting residue
As between 0.05%~0.17%, basicity is generally 6~8, while casting residue can increase the quantity of slag these conditions and be conducive to promote
Into the progress of desulphurization reaction.Meanwhile the above method realizes the complete alternation utilization of the hot casting residue of ladle, casting residue middle reaches substantially
The SiO generated from silicon in calcium oxide and free magnesium and molten iron through peroxidating2Reaction generates calcium silicates and monticellite etc.
Slag making materials, alleviate waste sludge discharge environmental pressure and processing cost, and environmental benefit is obvious.
Also, since the basicity of casting residue (generally 6~8) (2.8~3.5 is left usually above the basicity of converter smelting
It is right), the casting residue of high alkalinity is conducive to the raising of the dephosphorization rate and desulfurization degree of converter；Secondly, casting residue is pre-melted slag, smelting
Early period can rapid slagging removing molten iron in [P] and [S]；Meanwhile recycling for hot casting residue increases converter slag-making slag
Amount, is also conducive to the raising of converter dephosphorization rate and desulfurization degree.
In addition, in the prior art, casting residue is returned to LF refining process, LF refining process has bottom to mix heated by electrodes mistake
Journey wants strict control to prevent molten steel from overflowing and keeping subsequent the headroom control precision of ladle and pours stabilization.And the present invention will
Casting residue returns to pneumatic steelmaking process, and hot-metal bottle does not have bottom blowing stirring, requires opposite decrease to the headroom control of hot-metal bottle.
In addition, the above method be only change casting residue recycle mode, existing weaponry and equipment is not needed to be transformed,
With preferable market application prospect.
Specifically, the above method includes the following steps:
Step 1: after converter tapping, vessel slag being carried out to nitrogen in converter and splashes slag, vessel slag, which splashes to do, all stays in converter
It is interior, positioned at the furnace bottom and furnace lining of converter；
Step 2:, will to operation of skimming is carried out after desulfurizing iron pretreatment in hot-metal bottle by the way of KR stirring desulphurization
Hot casting residue mixes with the molten iron after skimming and is blended into converter, carries out converter smelting using " single slag " or " double slags " technique, needs
Illustrate, requires to add by adjusting rifle position height, oxygen flow, slag former in smelting process according to different steel grade smelting processes
Enter the measures such as amount, total oxygen-supplying amount to reach the temperature for smelting steel grade, carbon content, sulfur content and phosphorus content requirement.
In step 1, before splashing slag, magnesium ball can be added into vessel slag, the mass ratio of magnesium ball and steel is 2.0~
4.2kg/t contains higher Al this is because the basicity of hot casting residue is 6~82O3, Al2O3Fusing point it is lower, be added magnesium
Ball can be improved the viscosity of vessel slag, can preferably be attached to the furnace bottom and furnace lining of converter, is conducive to improve and splashes slag blanket
Erosion resisting, be conducive to safeguard converter lining durability.
In order to form effective clinker protective layer, the chemical composition mass percent of above-mentioned magnesium ball on furnace lining are as follows:
MgO >=70%, CaO≤1.5%, SiO2≤ 5%, loss on ignition≤25%, partial size is 20~60mm.For returning for hot casting residue
It receives and utilizes, the usage amount of magnesium ball is increased in slag splashing, meanwhile, splashing the slag time is 3~5min, and more conventional heat also extends
0.5~1min.The content of MgO in clinker can be made to increase in this way, since MgO is high-melting-point substances, 2800 DEG C of fusing point, furnace
The raising of content of MgO, makes slag viscosity become larger in slag, and refractoriness improves, and clinker is made to have suitable viscosity and refractoriness, clinker
It is more easily combined together with furnace lining, forms effective clinker protective layer on furnace lining, to improve lining durability, reduction disappears
Consumption.
In order to avoid the addition of hot casting residue causes the substance in hot-metal bottle to be more than the safe altitude of hot-metal bottle, step 2
In, after skimming, hot-metal bottle needs reserved head room > 300mm.
Illustratively, step 2 includes the following steps: for hot-metal bottle to be transported to molten steel after furnace and receives across will be equipped with more than hot casting
The ladle handling of slag so far and pours into molten iron surface, then hot-metal ladle and carriage is shipped back molten iron and is received across molten iron, which is blended into converter, to be needed
Hot casting residue is poured into hot-metal bottle from ladle, the reason is that can just carry out converter iron making operation, operational sequence in this way
It is simple and convenient.
In step 2, when being smelted using " single slag " technique, the adding manner of lime in smelting process are as follows: in initial smelting period
0~3min, be added without lime；To primary furnace (time point that thermometric samples in smelting process), point 3~5 batches add 3min
Enter lime, the lime adding amount of every batch of is 5~15kg/t steel；It once falling after furnace, the lime adding amount that fills into is 5~
10kg/t steel.
In step 2, when being smelted using " double slags " technique, the adding manner of lime in smelting process are as follows: in initial smelting period
0~3min, be added without lime；To centre, slag, one batch lime of addition, the additional amount of lime are 5~15kg/t steel to 3min；
Slag is fallen to primary furnace in centre, and lime is added in point 2~4 batches, and the lime adding amount of every batch of is 5~15kg/t steel, once
After furnace, the lime adding amount filled into is 5~10kg/t steel.
This is because hot casting residue recycles basicity of slag of heat itself relatively up to 6~8, while containing in slag
High level Al2O3, be conducive to initial smelting period rapid slagging, and itself high-temperature residual heat promotes initial smelting period rapid slagging to be conducive to
Dephosphorization and desulfurization, thus for conventional heat early period can reduction lime adding amount, and do not influence dephosphorization and desulfurization effect.
Lime 5~10kg/t steel once is added after furnace, lime is added under high temperature, the melting efficiency of lime improves, and is conducive to improve furnace
Basicity of slag, high efficiency dephosphorating desulfurization, to reach the temperature of steel grade needs, carbon content, sulfur content continues to blow on the basis of phosphorus content range
0.5~1.5min is refined, the gas for use of blowing is oxygen, and main benefit is control oxygen-supplying amount appropriate to reach terminal ingredient
With the requirement of temperature.
Embodiment 1
The hot casting residue of ladle is carried out using " single slag " technique to recycle.
Step 1: being tested using 120 tons of converters, remaining slag operation is used after tapping, the magnesium of average 350kg is added
Ball, splashing the slag time is averaged 3.8min, finishing slag splash it is dry all stays in converter, the molten iron equipped with casting residue is blended into converter and is carried out
" single slag " technological operation.
Step 2: casting residue is averaged 3.4 tons of additional amount, and tap is 125 tons average, when lower rifle blowing slag charge starts fusing, opens
Begin a small amount of multiple batches of addition lime, and lime adding amount be averaged 33.41kg/t steel (wherein one afterwards addition lime be averaged 950kg),
Light dolomite 13.40kg/t steel, sinter 5.5kg/t steel, magnesium ball are averaged 10.07kg/t steel.Oxygen supply time is average
14.09min (wherein one afterwards be averaged oxygen supply time 0.86min), oxygen demand 46.43Nm3/ t, coal-gas recovering 95.31Nm3/t.Smelting
The refining period is 36.9min.
The heat of the hot circulation utilization method of casting residue is not used to be compared (as shown in table 1 with 42 furnaces carried out simultaneously
Known to), overall cost ton steel can save 39.43 yuan/t steel.The recycling of liquid casting residue is limited by rhythm of production, so also according to every
Its about 10 tank of recycling calculates, then escapable cost: 30 × 12 × 10 × 125 × 39.43=1774.35, ten thousand yuan/year.
Table 1 " single slag " tests heat, and whether there is or not use to recycle influence of the casting residue to cost
Embodiment 2
Hot casting residue is carried out using " double slags " technique to recycle.
Step 1: being tested using 120 tons of converters, remaining slag operation is used after tapping, the magnesium of average 320kg is added
Ball, splashing the slag time is averaged 3.5min, finishing slag splash it is dry all stays in converter, the molten iron equipped with casting residue is blended into converter and is carried out
" double slags " technological operation.
Step 2: casting residue is averaged 3.3 tons of additional amount, and tap is 125.1 tons average, when lower rifle blowing slag charge starts fusing,
Start a small amount of multiple batches of addition lime, the lime adding amount 28.99kg/t steel that be averaged (wherein one lime is added afterwards is averaged
850kg), light dolomite 13.69kg/t steel, sinter 9.35kg/t steel, magnesium ball are averaged 7.12kg/t steel.Oxygen supply time is average
14.56min (wherein one afterwards be averaged oxygen supply time 1.05min), oxygen demand 46.1Nm3/ t, coal-gas recovering 86.45Nm3/t.Smelting
The refining period is 41.3min.
The heat of the hot circulation utilization method of casting residue is not used to be compared (as shown in table 2 with 36 furnaces carried out simultaneously
Known to), overall cost ton steel can save 22.02 yuan/t steel.The recycling of liquid casting residue is limited by rhythm of production, so according to daily
It recycles about 10 tanks to calculate, then escapable cost: 30 × 12 × 10 × 125.1 × 22.02=991.69, ten thousand yuan/month.
Table 2 " double slags " test heat has not using the influence for recycling casting residue to cost
Embodiment 3
The hot casting residue of ladle is carried out using " single slag " technique to recycle.
Step 1: being tested using 120 tons of converters, remaining slag operation is used after tapping, 250kg (i.e. 2kg/t is added
Steel) magnesium ball, splash slag time 3min, finishing slag splash it is dry all stays in converter, the molten iron equipped with casting residue is blended into converter and is carried out
" single slag " technological operation.
Step 2: 4 tons of casting residue additional amount, 125 tons of tap, when lower rifle blowing slag charge starts fusing, starting more batches a small amount of
(wherein one lime 625kg, i.e. 5kg/t steel is added) in secondary addition lime, lime adding amount 44kg/t steel afterwards, light dolomite
12kg/t steel, sinter 8.1kg/t steel, magnesium ball are averaged 9.05kg/t steel.The oxygen supply time 14.9min that is averaged (is wherein supplied after one
Oxygen time 0.5min), oxygen demand 45.4Nm3/ t, coal-gas recovering 96.6Nm3/t.Smelting cycle is 37.5min.
The heat of the hot circulation utilization method of casting residue is not used to be compared (as shown in Table 3) with another furnace, it is whole
Body cost ton steel can save 34.08 yuan/t steel.
Table 3 " single slag " tests heat, and whether there is or not use to recycle influence of the casting residue to cost
Embodiment 4
Hot casting residue is carried out using " double slags " technique to recycle.
Step 1: being tested using 120 tons of converters, remaining slag operation is used after tapping, 496kg (i.e. 4kg/t is added
Steel) magnesium ball, splash slag time 5min, finishing slag splash it is dry all stays in converter, the molten iron equipped with casting residue is blended into converter and is carried out
" double slags " technological operation.
Step 2: 4 tons of casting residue additional amount, 124 tons of tap, when lower rifle blowing slag charge starts fusing, starting more batches a small amount of
(wherein one lime 1240kg, i.e. 10kg/t steel is added) in secondary addition lime, lime adding amount 24.2kg/t steel afterwards, light-burned white clouds
Stone 17kg/t steel, sinter 7.5kg/t steel, magnesium ball 9.1kg/t steel.Oxygen supply time 14.9min (wherein one after oxygen supply time
1.5min), oxygen demand 48.3Nm3/ t, coal-gas recovering 86.8Nm3/t.Smelting cycle is 38.5min.
It does not use the heat of the hot circulation utilization method of casting residue to be compared with 1 furnace carried out simultaneously (as shown in table 4 may be used
Know), overall cost ton steel can save 26.22 yuan/t steel.
Table 4 " double slags " test heat has not using the influence for recycling casting residue to cost
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.
Claims (5)
1. a kind of method that converter recycles the hot casting residue of ladle, which is characterized in that remain in after molten steel is cast
Hot casting residue in ladle returns to pneumatic steelmaking process and carries out recycling；
The mass percent of the hot casting residue ingredient includes: the molten steel 40~50% of recycling, recrement 35~45% and remaining
The carbonization rice husk layer 5~10% on slag surface；The main chemical compositions of recrement are CaO, Al2O3、MgO、P2O5And SiO2；It is described hot
The basicity of casting residue is 6~8；
Described method includes following steps:
Step 1: after converter tapping, vessel slag being carried out to splash slag in converter, vessel slag, which splashes to do, all to be stayed in converter, is located at and is turned
The furnace bottom and furnace lining of furnace；
Step 2: carrying out operation of skimming after pre-processing in hot-metal bottle to desulfurizing iron, the molten iron by hot casting residue and after skimming
Mixing is blended into converter, carries out converter smelting；
It in the step 1, after converter tapping, splashes before slag, magnesium ball, the chemical composition matter of the magnesium ball is added into vessel slag
Measuring percentage includes: MgO >=70%, CaO≤1.5%, SiO2≤ 5%, loss on ignition≤25%, the partial size of the magnesium ball is 20~
60mm；
The step 2 includes the following steps: to carry out operation of skimming after pre-processing desulfurizing iron in hot-metal bottle；Hot-metal bottle is transported
After to furnace molten steel receive across, will be transported at the feed inlet of hot-metal bottle and pour into molten iron surface equipped with the ladle of hot casting residue, then
Hot-metal ladle and carriage be shipped back molten iron receive across, by molten iron be blended into converter carry out converter smelting；
In the step 2, converter smelting is carried out using single slag or double slag techniques；
In the step 2, the list slag technique carries out the addition side that converter smelting includes the following steps: the lime in smelting process
Formula are as follows: in 0~3min of initial smelting period, be added without lime；3min is to once lime, every batch of is added in furnace, point 3~5 batches
Lime adding amount be 5~15kg/t steel；It once falls after furnace, the lime adding amount filled into is 5~10kg/t steel.
2. the method that converter according to claim 1 recycles the hot casting residue of ladle, which is characterized in that the magnesium ball
Mass ratio with steel is 2.0~4.2kg/t.
3. the method that converter according to claim 1 recycles the hot casting residue of ladle, which is characterized in that described to splash slag
Time is 3~5min.
4. the method that converter according to any one of claims 1 to 3 recycles the hot casting residue of ladle, feature exist
In, in the step 2, after skimming, the reserved head room > 300mm of hot-metal bottle.
5. the method that converter according to claim 1 recycles the hot casting residue of ladle, which is characterized in that the step
In 2, using double slag techniques carry out converter smelting, the adding manner of lime in smelting process are as follows: initial smelting period 0~
3min is added without lime；To centre, slag, one batch lime of addition, the additional amount of lime are 5~15kg/t steel to 3min；It is intermediate
Slag is to furnace is once fallen, and lime is added in point 2~4 batches, and the lime adding amount of every batch of is 5~15kg/t steel, once fall furnace it
Afterwards, the lime adding amount filled into is 5~10kg/t steel.
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| JP2653301B2 (en) * | 1991-12-05 | 1997-09-17 | 住友金属工業株式会社 | Reusing method of low P converter slag |
| CN103060512B (en) * | 2013-02-07 | 2014-04-02 | 武钢集团昆明钢铁股份有限公司 | Dephosphorizing and steelmaking method of medium-high-phosphorous semisteel by top-blown converter |
| CN103333980A (en) * | 2013-07-12 | 2013-10-02 | 鞍钢股份有限公司 | Recycling method of casting slag |
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