CN103820598A - Slag-regulating and converter-protecting method of boric sludge for slag-splashing converter protection - Google Patents
Slag-regulating and converter-protecting method of boric sludge for slag-splashing converter protection Download PDFInfo
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- CN103820598A CN103820598A CN201310600425.1A CN201310600425A CN103820598A CN 103820598 A CN103820598 A CN 103820598A CN 201310600425 A CN201310600425 A CN 201310600425A CN 103820598 A CN103820598 A CN 103820598A
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Abstract
The invention belongs to the field of metallurgy of iron and steel, and in particular relates to a slag-regulating and converter-protecting method of boric sludge for slag-splashing converter protection. The boric sludge and coke powder are mixed and pressed into a ball according to the mass fraction of 100 : (8-12), and the ball serves as a slag regulating agent for a slag-splashing converter protection process. The slag-splashing converter protection process employing the slag regulating agent comprises the following steps: firstly, after steel is tapped from a converter and slag is remained in the converter, adding the coke powder into the converter according to the slag remaining quantity and the content of iron oxide in the slag to reduce the iron oxide in the slag; secondly, adding the slag regulating agent according to the slag remaining quantity of the converter, wherein the addition quantity accounts for 10-20 percent of the mass fraction of the slag remaining quantity; finally, adding magnesia into the converter to control the content of MgO in the slag to be 20-25 percent, performing gun-dropping nitrogen-blowing, and then performing slag-splashing converter protection. According to the method, the adhesion stability of the slag to a converter wall can be remarkably improved, the high temperature resistance and the welding corrosion of slag steel can be remarkably improved, the slag-splashing converter protection effect is improved, and the lining life of the converter is greatly prolonged.
Description
The invention belongs to ferrous metallurgy field, specially refer to residue adjustment and the furnace retaining method of a kind of boron mud for slag splashing.
Background technology
First LTV steel company of the U.S. has invented converter protecting method with splash slag, the method is after converter tapping, to leave part finishing slag, and add appropriate slag supplying agent, make slag there is suitable viscosity and higher refractoriness, then with the high pressure nitrogen slag of jetting, make slag sputter adhere to furnace wall and form new fire-resistant resist layer, thereby reach protection furnace lining and improve the object in furnace life; Generally speaking, the furnace life while not adopting slag splashing seldom exceedes 5000 heats, but implements after slag splashing technique, and more than furnace life generally can reach ten thousand stoves, more than even reaching 50,000 stoves, therefore, protecting method with splash slag is able to extensive popularization.
In slag splashing technique, the link of most critical is the residue adjustment processing of slag, the slag supplying agent that joins converter in prior art is generally MgO and reductive agent, and MgO can improve viscosity and the sintering point (being refractoriness) of slag, and reductive agent plays the effect of ferric oxide in reducing slag, the same viscosity of slag and the fusing point of slag of improving, slag viscosity after modified is high, fusing point is high, is conducive to furnace wall dross, and after residue adjustment in slag MgO content high, refractoriness is high, and dry slag layer high temperature resistance erosional competency strengthens.
But, the outstanding problem that slag splashing exists at present has two: the one, and after residue adjustment, the iron oxide content of slag is more than 8%, the refractoriness that slag blanket is spattered in impact, in addition, ferric oxide plays and improves slag wettability and adhering effect in slag, its content reduces, and dross effect worsens, and the iron oxide content that therefore in prior art, slag blanket fire performance is spattered in impact can not reduce; The 2nd, the content of magnesia after residue adjustment in slag is on the low side, generally be no more than 12%, this is also the optimum value of obtaining for current slag splashing residue adjustment, further improve magnesium oxide, refractoriness improves, but because adhesivity, the wettability of slag decline, dross effect worsens equally, therefore,, in existing Technology of Slag Splashingfor Furnace Maintenance, the content of magnesia that improves slag splashing dross layer fire performance can not improve; In a word, for existing slag removing and furnace protecting technology, need to study new residue adjustment method, first need to guarantee that under the wettability of slag and the prerequisite of tack, iron oxide content in slag blanket is spattered in reduction, improves the refractoriness of spattering slag blanket, studies have shown that, spattering wustite in slag blanket is to reduce the main reason of spattering slag blanket refractoriness, but ferric oxide improves slag wettability, tack while being current slag splashing again, guarantees the stable major components of dross layer; In addition, improve refractoriness and the life-span of spattering slag blanket, need to guarantee, under the prerequisite of slag wettability, tack and dross layer stability, further to improve content of magnesia in slag, to improve refractoriness; Therefore, need research can substitute ferric oxide and improve the slag supplying agent that spatters slag charge wettability, tack and stability, and improve and spatter the resistivity against fire of slag blanket and the erosion of resistance to slag to greatest extent, this need to develop new slag splashing residue adjustment method.
Summary of the invention
The object of this invention is to provide residue adjustment and the furnace retaining method of a kind of boron mud for slag splashing, solve that current slag splashing residue adjustment rear oxidation iron level can not reduce and content of magnesia can not improve caused spattering that slag blanket resistivity against fire is poor, dross weak effect, spatter the problem of slag blanket high temperature resistance and slag corrode poor performance.
The object of the invention is to realize by following technical proposal:
Boron mud is for residue adjustment and the furnace retaining method of slag splashing, and its feature is as follows:
Deslagging after converter steelmaking tapping, adopts and stays slag not stay steel operation, and staying the quantity of slag is 4 ~ 6% of converter volume capacity, then enters residue adjustment step, and its key step is:
A), converter tapping stays after slag, according to staying iron oxide content in the quantity of slag and slag to add coke powder in stove, the add-on of coke powder will meet is down to the iron oxide content in slag below 1%;
B), according to staying the quantity of slag to add boron mud-carbon ball slag supplying agent of the present invention in stove, boron mud-carbon ball be boron mud and coke powder by massfraction than 100:(8-12) the spherical material that is pressed into after batch mixing, its granularity is 10-30mm, and the add-on of boron mud-carbon ball is in stove, to stay the 10-20% of quantity of slag massfraction;
C), then in stove, add magnesia, the add-on of magnesia will make the MgO in slag be controlled in the scope of 20%-25%;
D), finally fall rifle nitrogen flushing, implement slag splashing, this step is without particular requirement, and the method adopting with conventional slag splashing is identical.
For guaranteeing result of use of the present invention, limit as follows to adopted ingredient requirement:
The component target of the boron mud using is: B
2o
3quality percentage composition is less than 1.5 %, and the quality percentage composition of MgO is greater than 50%.
The component target of the coke powder using: fixed carbon >90%, ash content, impurity, moisture sum are less than 10%.
The quality percentage composition >90% of MgO in the magnesia using.
In the present invention, the Main Function of boron mud-carbon ball is to improve wettability and the adhesion property of slag, and our experimental study proves, boron mud ball can improve the wettability of slag and the effect of adhesion property is more remarkable than ferric oxide, reduce the density of spattering slag blanket slag charge, the dross effect while improving slag splashing simultaneously; In addition, magnesium oxide in boron mud improves the refractoriness of spattering slag blanket, in boron mud, allocate coke powder into and make boron mud-carbon ball, under furnace high-temperature effect, ferric oxide in boron mud is reduced, there is the direct-reduction-carburizing reagent of silicon-dioxide simultaneously, the silicon carbide generating further improves stability and the resistivity against fire of spattering slag blanket, therefore, the effect of boron mud ball replaces ferric oxide completely, the ferric oxide spattering in slag charge can be down to below 1%, even 0, this has improved fire performance and the stability of slag splashing furnace protecting material greatly; In addition, when available technology adopting contains the slag splashing furnace protecting material of ferric oxide, in slag, magnesian content is generally 12%, can not exceed 15%, this has limited the refractoriness of spattering slag blanket, because continue to improve magnesium oxide, the tack of slag declines, dross difficulty, and the present invention adds the residue adjustment of boron mud-carbon ball, spatter slag blanket wettability and adhesion property and improve, the add-on optimum range of magnesia is 20%-25%, this is to spatter the wettability of slag blanket with suitable containing oxidation scum, has stable dross effect.
In residue adjustment method of the present invention the selection of each material and add-on determine according to being described as follows:
Coke powder: in residue adjustment method of the present invention, ferric oxide total amount in furnace retaining material is reduced to below 1%, need according to staying iron oxide content in the quantity of slag and slag to calculate the add-on of determining coke powder.
Boron mud-carbon ball: boron mud-carbon ball has two aspect effects, the one, wettability and the tack of raising slag, substitute the ferric oxide spattering in slag charge completely; On the other hand, improve the refractory composition spattering in slag blanket, the add-on of boron mud-carbon ball is in stove, to stay the 10-20% of quantity of slag massfraction; In boron mud-carbon ball, boron mud is pressed massfraction than 100:(8-12 with the ratio of carbon), the ferric oxide in boron mud and dioxide-containing silica and while being greater than 35%, mixed carbon comtent capping, boron mud compares 100:12 with the ratio of carbon by massfraction; And when the ferric oxide in boron mud and dioxide-containing silica with while being less than 25%, mixed carbon comtent removes the limit, boron mud compares 100:8 with the ratio of carbon by massfraction; In boron mud, ferric oxide and dioxide-containing silica sum are in the time of 25%-35%, and the mixed carbon comtent in boron mud-carbon ball should be greater than 8 and be less than 12.
Magnesia: magnesia main component is MgO, the MgO in raising slag can improve fusing point and the viscosity of slag, the fire-resistant corrosion resisting property that is conducive to spatter slag dross and improves dross layer; The add-on of magnesia will make the MgO in slag be controlled in the scope of 20%-25%.
advantage of the present invention
Compared with prior art, adopt advantage of the present invention as follows:
1. the present invention is down to ferric oxide in slag splashing furnace protecting material below 1%, slag blanket non-oxidation iron is spattered in realization, solve and had the problem of spattering slag blanket high temperature resistance and slag corrode poor performance causing because of ferric oxide, boron mud-carbon ball has effectively improved wettability and the tack of slag in addition, further improve the fire-resistant corrosion resisting property of dross effect and dross layer, guarantee that lining life is more than 20,000 stoves.
2. adopt the present invention, the magnesium oxide spattering in slag blanket can be brought up to 20-25%, is enhanced about more than once than magnesian content in slag splashing furnace protecting material in prior art, has solved content of magnesia in prior art and can not improve the caused low problem of slag blanket life-span of spattering.
3. boron mud-carbon ball of the present invention residue adjustment, improving slag splashing furnace protecting material to aspect furnace wall wettability and tack, effect is better than ferric oxide completely, magnesium oxide and high-melting-point carbide in boron mud-carbon ball, become the aggregate component in slag splashing furnace protecting material, improve fire performance and the dross stability of dross layer.
4. residue adjustment method of the present invention is simple, and raw material sources are wide, and cost is low, does not increase the investment of equipment casthouse equipment, has reduced fettling, scarfing cinder equal time, has improved the production efficiency of converter, has distinct economic.
Embodiment
Below in conjunction with embodiment, the invention will be further elaborated; Embodiment is only for the present invention is described, rather than limits by any way the present invention.
embodiment 1
For 20 tons of converter smeltings of domestic certain factory, implement the present invention, operation steps is as follows:
(1) bessemerize while end, deslagging side is shaken in converter, sampling analysis, and in slag, ferric oxide is 20%;
(2) tapping at 1680 ℃, tapping adopts stays slag not stay steel operation, stays the quantity of slag to be controlled at 5% of converter volume capacity, is 400Kg according to calculating the quantity of slag;
(3) gone out after steel, shake positive converter, in stove, add slag splashing slag supplying agent to carry out residue adjustment processing, first add coke powder 10Kg, the coke powder adding is in theory 6Kg, consider scaling loss, the add-on of determining coke powder is 10Kg, ferric oxide in slag is reduced completely, get slag specimen and do XRD analysis, ferric oxide total amount <0.8% in slag, because coke powder is excessive, in slag, ferric oxide should be reduced in theory completely, when analysis, in slag, there are trace or a small amount of ferric oxide, that slag specimen has a small amount of shim in sampling process, in sampling and sample making course, due in slag, remaining iron is oxidized, then add boron mud-carbon ball, in boron mud-carbon ball, the ratio of the massfraction of boron mud and coke powder is 100:11.5, and the add-on of boron peat ball is in stove, to stay 15% of quantity of slag massfraction, i.e. 60Kg, then in stove, add magnesia, the add-on 60Kg of magnesia, add after magnesia, in stove, in slag splashing furnace protecting material, the massfraction of MgO is 20%, then implement slag splashing operation, high pressure nitrogen is blown in stove with oxygen rifle to enforcement slag splashing, the processing parameter that slag splashing adopts is as follows: the distance between nitrogen flushing rifle rifle head and the furnace bottom top of the slag is controlled within the scope of 0.5 ~ 1.5m, takes to change rifle position, be blown into the pressure-controlling of nitrogen at 1.3MPa, the flow that is blown into nitrogen is 120Nm
3/ min, the time that is blown into nitrogen is 3min.
Implementation result: after slag splashing completes, in fire door observation stove, spatter slag situation, find that thickness of slag layer is spattered in furnace wall even, compared with prior art, dross layer is even, and stove inwall is level and smooth, without naked brick and dross layer obscission, implement one time slag splashing, the life-span of spattering slag blanket improves 20% than prior art, changes 5 stove one dross into by 4 original stove one dross.
embodiment 2
For 80 tons of converter smeltings of domestic certain factory, implement the present invention, operation steps is as follows:
(1) bessemerize while end, deslagging side is shaken in converter, sampling analysis, and in slag, ferric oxide is 18%;
(2) tapping at 1670 ℃, tapping adopts stays slag not stay steel operation, stays the quantity of slag to be controlled at 6% of converter volume capacity, is 800Kg left and right according to calculating the quantity of slag;
(3) gone out after steel, shake positive converter, in stove, add slag splashing slag supplying agent to carry out residue adjustment processing, first add coke powder 20Kg, ferric oxide in slag is reduced completely, the coke powder adding is in theory 12Kg, consider scaling loss, the add-on of determining coke powder is 20Kg, ferric oxide in slag is reduced completely, get slag specimen and do XRD analysis, ferric oxide total amount <0.5% in slag, because coke powder is excessive, in slag, ferric oxide should be reduced in theory completely, when analysis, in slag, there are trace or a small amount of ferric oxide, that slag specimen has a small amount of shim in sampling process, in sampling and sample making course, due in slag, remaining iron is oxidized, then add boron mud-carbon ball, in boron mud-carbon ball, the ratio of the massfraction of boron mud and coke powder is 100:11, and the add-on of boron peat ball is in stove, to stay 10% of quantity of slag massfraction, i.e. 80Kg, then in stove, add magnesia, the add-on 100Kg of magnesia, add after magnesia, in stove, in slag splashing furnace protecting material, the massfraction of MgO is 25%, then implement slag splashing operation, high pressure nitrogen is blown in stove with oxygen rifle to enforcement slag splashing, the processing parameter that slag splashing adopts is as follows: the distance between nitrogen flushing rifle rifle head and the furnace bottom top of the slag is controlled within the scope of 0.5 ~ 1.5m, takes to change rifle position, be blown into the pressure-controlling of nitrogen at 1.5MPa, the flow that is blown into nitrogen is 140Nm
3/ min, the time that is blown into nitrogen is 3min.
Implementation result: after slag splashing completes, in fire door observation stove, spatter slag situation, find that thickness of slag layer is spattered in furnace wall even, compared with prior art, dross layer is even, and stove inwall is level and smooth, without naked brick and dross layer obscission, implement one time slag splashing, the life-span of spattering slag blanket improves 20% than prior art, changes 5 stove one dross into by 4 original stove one dross.
embodiment 3
For 85 tons of converter smeltings of domestic certain factory, implement the present invention, operation steps is as follows:
(1) bessemerize while end, deslagging side is shaken in converter, sampling analysis, and in slag, ferric oxide is 15%;
(2) tapping at 1670 ℃, tapping adopts stays slag not stay steel operation, stays the quantity of slag to be controlled at 4% of converter volume capacity, is 650Kg left and right according to calculating the quantity of slag;
(3) gone out after steel, shake positive converter, in stove, add slag splashing slag supplying agent to carry out residue adjustment processing, first add coke powder 18Kg, ferric oxide in slag is reduced completely, the coke powder adding is in theory 10Kg, consider scaling loss, the add-on of determining coke powder is 18Kg, ferric oxide in slag is reduced completely, get slag specimen and do XRD analysis, ferric oxide total amount <0.4% in slag, because coke powder is excessive, in slag, ferric oxide should be reduced in theory completely, when analysis, in slag, there are trace or a small amount of ferric oxide, that slag specimen has a small amount of shim in sampling process, in sampling and sample making course, due in slag, remaining iron is oxidized, then add boron mud-carbon ball, in boron mud-carbon ball, the ratio of the massfraction of boron mud and coke powder is 100:12, and the add-on of boron peat ball is in stove, to stay 20% of quantity of slag massfraction, i.e. 130Kg, then in stove, add magnesia, the add-on 100Kg of magnesia, add after magnesia, in stove, in slag splashing furnace protecting material, the massfraction of MgO is 20%, then implement slag splashing operation, high pressure nitrogen is blown in stove with oxygen rifle to enforcement slag splashing, the processing parameter that slag splashing adopts is as follows: the distance between nitrogen flushing rifle rifle head and the furnace bottom top of the slag is controlled within the scope of 0.5 ~ 1.5m, takes to change rifle position, be blown into the pressure-controlling of nitrogen at 1.5MPa, the flow that is blown into nitrogen is 140Nm
3/ min, the time that is blown into nitrogen is 3min.
Implementation result: after slag splashing completes, in fire door observation stove, spatter slag situation, find that thickness of slag layer is spattered in furnace wall even, compared with prior art, dross layer is even, and stove inwall is level and smooth, without naked brick and dross layer obscission, implement one time slag splashing, the life-span of spattering slag blanket improves 20% than prior art, changes 5 stove one dross into by 4 original stove one dross.
Claims (7)
1. a boron mud is for residue adjustment and the furnace retaining method of slag splashing, it is characterized in that: slag splashing is front to staying slag to carry out residue adjustment processing in stove, boron mud-carbon ball that residue adjustment adopts boron mud and coke powder to make, and further improve the magnesian amount in slag charge of spattering with magnesia, reduce the amount of spattering ferric oxide in slag charge with coke powder, then implement slag splashing.
2. a kind of boron mud as claimed in claim 1 is for residue adjustment and the furnace retaining method of slag splashing, it is characterized in that: boron mud-carbon ball that residue adjustment adopts boron mud and coke powder to make, wherein, boron mud and coke powder are pressed massfraction than 100:(8-12) batch mixing pressure ball, the add-on of boron mud-carbon ball is in stove, to stay the 10-20% of quantity of slag massfraction.
3. a kind of boron mud as claimed in claim 2 is for residue adjustment and the furnace retaining method of slag splashing, it is characterized in that: when the ferric oxide in boron mud and dioxide-containing silica with while being greater than 35%, mixed carbon comtent capping, boron mud compares 100:12 with the ratio of carbon by massfraction; And when the ferric oxide in boron mud and dioxide-containing silica with while being less than 25%, mixed carbon comtent removes the limit, boron mud compares 100:8 with the ratio of carbon by massfraction; In boron mud, ferric oxide and dioxide-containing silica sum are in the time of 25%-35%, and the mixed carbon comtent in boron mud-carbon ball should be greater than 100:8 and be less than 100:12.
4. a kind of boron mud as claimed in claim 1, for residue adjustment and the furnace retaining method of slag splashing, is characterized in that comprising the steps:
Deslagging after converter steelmaking tapping, adopts and stays slag not stay steel operation, and staying the quantity of slag is 4 ~ 6% of converter volume capacity, then enters residue adjustment step, and its key step is:
A), converter tapping stays after slag, according to staying iron oxide content in the quantity of slag and slag to add coke powder in stove, the add-on of coke powder will meet is down to the iron oxide content in slag below 1%;
B), according to staying the quantity of slag to add boron mud-carbon ball slag supplying agent of the present invention in stove, boron mud-carbon ball be boron mud and coke powder by massfraction than 100:(8-12) the spherical material that is pressed into after batch mixing, its granularity is 10-30mm, and the add-on of boron mud-carbon ball is in stove, to stay the 10-20% of quantity of slag massfraction;
C), then in stove, add magnesia, the add-on of magnesia will make the MgO in slag be controlled in the scope of 20%-25%;
D), finally fall rifle nitrogen flushing, implement slag splashing.
5. a kind of boron mud as claimed in claim 1, for residue adjustment and the furnace retaining method of slag splashing, is characterized in that: the component target of the boron mud using is: B
2o
3quality percentage composition is less than 1.5 %, and the quality percentage composition of MgO is greater than 50%.
6. a kind of boron mud as claimed in claim 1, for residue adjustment and the furnace retaining method of slag splashing, is characterized in that: the component target of the coke powder using: fixed carbon >90%, ash content, impurity, moisture sum are less than 10%.
7. a kind of boron mud as claimed in claim 1, for residue adjustment and the furnace retaining method of slag splashing, is characterized in that: the quality percentage composition >90% of MgO in the magnesia using.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310600425.1A CN103820598B (en) | 2013-11-25 | 2013-11-25 | A kind of boron mud is used for residue adjustment and the furnace retaining method of slag splashing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310600425.1A CN103820598B (en) | 2013-11-25 | 2013-11-25 | A kind of boron mud is used for residue adjustment and the furnace retaining method of slag splashing |
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| CN103820598A true CN103820598A (en) | 2014-05-28 |
| CN103820598B CN103820598B (en) | 2015-08-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105219920A (en) * | 2014-06-23 | 2016-01-06 | 鞍钢股份有限公司 | A kind of boracic spheroid additive and preparation method thereof |
| CN111778378A (en) * | 2020-07-13 | 2020-10-16 | 唐山飞迪冶金材料有限公司 | Converter slag splashing furnace protecting material and using method thereof |
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|---|---|---|---|---|
| US20060105901A1 (en) * | 2004-11-17 | 2006-05-18 | Stein Joseph L | Slag conditioner composition, process for manufacture and method of use in steel production |
| CN101033496A (en) * | 2007-04-03 | 2007-09-12 | 江苏大学 | Alkaline oxygen converter steelmaking slagging fluxing agent and its preparing method and slagging method |
| CN102127612A (en) * | 2011-02-15 | 2011-07-20 | 江苏大学 | Slag adjusting and furnace protecting method for controlling rising of converter bottom and furnace wall slag deposition |
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2013
- 2013-11-25 CN CN201310600425.1A patent/CN103820598B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060105901A1 (en) * | 2004-11-17 | 2006-05-18 | Stein Joseph L | Slag conditioner composition, process for manufacture and method of use in steel production |
| CN101033496A (en) * | 2007-04-03 | 2007-09-12 | 江苏大学 | Alkaline oxygen converter steelmaking slagging fluxing agent and its preparing method and slagging method |
| CN102127612A (en) * | 2011-02-15 | 2011-07-20 | 江苏大学 | Slag adjusting and furnace protecting method for controlling rising of converter bottom and furnace wall slag deposition |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105219920A (en) * | 2014-06-23 | 2016-01-06 | 鞍钢股份有限公司 | A kind of boracic spheroid additive and preparation method thereof |
| CN111778378A (en) * | 2020-07-13 | 2020-10-16 | 唐山飞迪冶金材料有限公司 | Converter slag splashing furnace protecting material and using method thereof |
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