CN105642850A - Continuous casting crystallizer covering slag for ASP medium-carbon steel and a preparation method thereof - Google Patents
Continuous casting crystallizer covering slag for ASP medium-carbon steel and a preparation method thereof Download PDFInfo
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- CN105642850A CN105642850A CN201610131980.8A CN201610131980A CN105642850A CN 105642850 A CN105642850 A CN 105642850A CN 201610131980 A CN201610131980 A CN 201610131980A CN 105642850 A CN105642850 A CN 105642850A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
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Abstract
The invention discloses continuous casting crystallizer covering slag for ASP medium-carbon steel and a preparation method thereof. The covering slag comprises the following raw materials in percentage by weight: 0-6% of glass powder, 10-30% of premelting materials, 10-30% of wollastonite, 10.5-15.5% of fluorite, 4-8% of white alkali, 4-8% of carbon black, 4.5-8.5% of graphite, 0-5% of sodium fluoride, 5-8% of manganese carbonate, 4-9% of magnesia, 8-12% of bauxite, 0.5-3% of cryolite, 1-3% of adhesive, and 0.3-1% of water reducing agent. The covering slag optimizes the ratio, guarantees a certain melting speed while guaranteeing the insulation effect, has a certain liquid slag layer thickness, is uniformly consumed, guarantees smooth actuation of a continuous casting process, and produces an excellent casting blank.
Description
Technical field
The present invention relates to a kind of covering slag, especially relate to a kind of ASP medium carbon steel continuous crystallizer protecting slag and preparation method thereof.
Background technology
Along with the progress of science and technology, continuous casting technology is progressively to move to maturity. But, constantly perfect due to steel-smelting technology, make steel tempo increase, stove tap increases, and compared with steel-making and follow-up steel rolling ability, the production capacity of conticaster is still the restricted link in whole steel manufacture process. For this, in the last few years, the commonly used continuously casting and continuously rolling technology of domestic and international iron and steel enterprise. Continuous casting and rolling due to its technique simplify, with short production cycle, lumber recovery is higher, be suitable to produce product with hot Dai Leng etc., receive and favor widely, there is vast potential for future development. But high pulling rate technology also brings many new difficult problems to continuous casting process; most important it is exactly; increase along with casting speed; continuous casting functional protective material relative consumption reduces; can cause that the lubrication between crystallizer wall and solidified shell is uneven, it is uneven to conduct heat; and then cause surface defect of bloom, even there is bonding steel leakage, particularly in astable continuous casting period.
In casting process, can covering slag play due effect, depends primarily on performance and the ratio etc. of allocated into raw material. Mold flux property is had material impact by the selection of covering slag slag charge. It is typically chosen raw material and should follow following several principles: 1. the chemical composition of raw material should be stablized as far as possible, and should as close possible to the chemical constituent scope of the covering slag selected. 2. the kind of basic material is unsuitable too much, to avoid preparation process excessively complicated, is beneficial to the performance adjusting bits. 3. bulk density is little, has good heat-insulating property. 4. there are the physical and chemical performances such as suitable melt temperature, viscosity, basicity. 5.Al2O3Content is low as far as possible, to ensure that covering slag absorbs the ability of field trash. 6. should not polluting molten steel, S, P, C, Fe content is low as far as possible.
The viscosity of continuous casting covering slag, includes melt cinder inflow to the metallurgical behavior occurred in crystallizer and consumption, lubrication, field trash absorption etc. produce material impact. Generally, covering slag requires have certain heat transfer property, good heat-insulating property, good nonmetal absorption, good lubrication and stable performance.When covering slag viscosity is too high, it is difficult to flowing into the gap between molten steel meniscus and crystallizer, covering slag slag film is thin and uneven, and consumption is little, easily cause lubrication, conduct heat bad, may result in green shell generation longitudinal crack. When covering slag viscosity is too low, flux film can being made blocked up, slag non-uniform film thickness, lubrication and heat transfer inequality can occur equally, lobe increases.
Chinese patent CN103785805A discloses a kind of square billet middle low carbon steel high intensity continuous crystallizer protecting slag and production method thereof, and described covering slag composition (unit: wt%) including: CaO29 ~ 32, SiO228 ~ 31, MgO1.6 ~ 2.2, Fe2O31.6 ~ 2.5, Al2O36.5 ~ 8.5, Na2O4.5 ~ 6.5, F4.5 ~ 6.5, CGu11.5 ~ 13.5; This method production cost is low, can improve again quality and the yellow phosphorus waste slag utilization rate of covering slag, and after producing, strand one-level qualification rate improves 2.4 ~ 2.9% on year-on-year basis. Chinese patent CN103785806A discloses a kind of slab high intensity continuous crystallizer protecting slag and production method thereof, and described covering slag composition (unit: wt%) including: SiO226-29, CaO32-36, MgO1.5-2.5, Al2O33-5, Na2O8-10, F8.5-10.5, CGu3-5, Fe2O3�� 1.5; The method production cost is low, can improve again quality and the yellow phosphorus waste slag utilization rate of covering slag, and ambient contribution is big, and after testing, strand one-level qualification rate improves 2.2-2.7% on year-on-year basis.
But, the production of above-mentioned patent high intensity continuous crystallizer protecting slag is all with wollastonite, bauxites etc. are base material, with fluorite, soda etc. are flux, with graphite, white carbon blacks etc. are carbonaceous material, join sanlose (CMC) again or dextrin is binding agent, but disperse impaired performance when CMC is more than 300 DEG C, and normally granulation tower tower temperature is about 700 DEG C, owing to product particle intensity is at 260 ~ 290Pa, product particle intensity difference causes that product balling ratio is about 85%, product balling ratio is low, dust is more, a part of dust is reclaimed by dedusting, a part of dust flies away in atmosphere, cause environmental pollution.
Summary of the invention
In view of this, it is an object of the invention to for the deficiencies in the prior art, it is provided that a kind of ASP medium carbon steel continuous crystallizer protecting slag and preparation method thereof, improve viscosity, improve heat transfer and the lubricant effect of covering slag, reduce steel surface defect.
For reaching above-mentioned purpose, the present invention by the following technical solutions:
A kind of ASP medium carbon steel continuous crystallizer protecting slag, as follows including raw material and weight percentage thereof: glass dust: 0% ~ 6%, pre-melt: 10% ~ 30%; wollastonite: 10% ~ 30%, fluorite: 10.5% ~ 15.5%, white alkali: 4% ~ 8%; carbon black: 4% ~ 8%; graphite: 4.5% ~ 8.5%, sodium fluoride: 0% ~ 5%, manganese carbonate: 5% ~ 8%; magnesia: 4% ~ 9%; aluminum vanadine: 8% ~ 12%, cryolite: 0.5% ~ 3%, binding agent: 1% ~ 3% and water reducer: 0.3% ~ 1%.
Preferably, a kind of ASP medium carbon steel continuous crystallizer protecting slag, as follows including raw material and weight percentage thereof: glass dust: 0% ~ 6%; pre-melt: 10% ~ 30%, wollastonite: 10% ~ 30%, fluorite: 10.5% ~ 15.5%; white alkali: 4% ~ 8%, carbon black: 6%, graphite: 6.5%; sodium fluoride: 0% ~ 5%; manganese carbonate: 5% ~ 8%, magnesia: 4% ~ 9%, aluminum vanadine: 8% ~ 12%; cryolite: 0.5% ~ 3%, binding agent: 1% ~ 3% and water reducer: 0.3% ~ 1%.
Preferably, described binding agent is the mixture of oxidized starch adhesive and drier, and the weight ratio of described oxidized starch adhesive and drier is: 100:1 ~ 5.
Preferably, described drier is organic drier polyvinyl alcohol.
Preferably, described water reducer is polycarboxylic acid water reducing agent.
Preferably, the fusion temperature of described covering slag: 1050 DEG C ~ 1100 DEG C, the viscosity when 1300 DEG C is: 0.25 ~ 0.4Pa.s, the basicity (CaO/SiO of described covering slag2) it is 0.7��0.8.
Its preparation method, comprises the following steps that 1) glass dust, pre-melt, wollastonite, fluorite, white alkali, sodium fluoride, manganese carbonate, magnesia, aluminum vanadine and cryolite are pulverized and mix homogeneously; 2) in step 1) mixed material, add binding agent, water reducer, white carbon black and the fusing of graphite entering slag hearth, obtain melt cinder; 3) melt cinder is through Water Quenching, dry, pulverizing; 4) remix, mist projection granulating.
It should be noted that the viscosity of continuous casting covering slag, the metallurgical behavior occurred is included melt cinder inflow and consumption, lubrication, field trash absorption etc. produce material impact in crystallizer. Generally, covering slag requires have certain heat transfer property, good heat-insulating property, good nonmetal absorption, good lubrication and stable performance. When covering slag viscosity is too high, it is difficult to flowing into the gap between molten steel meniscus and crystallizer, covering slag slag film is thin and uneven, and consumption is little, easily cause lubrication, conduct heat bad, may result in green shell generation longitudinal crack. When covering slag viscosity is too low, flux film can being made blocked up, slag non-uniform film thickness, lubrication and heat transfer inequality can occur equally, lobe increases.
The invention has the beneficial effects as follows:
1. proportion optimizing in the production decision of the present invention, it is ensured that while heat insulation effect, it is ensured that certain burn-off rate, thus making it have certain liquid slag layer thickness, makes covering slag be consumed equably, so that it is guaranteed that continuous casting process direct motion, produces the strand of high-quality.
2. add but when covering slag is allocated into a small amount of Li2O��B2O3Time, the viscosity of covering slag is with Al in slag2O3The amplitude of variation that content increases is less, adds a small amount of Li2O��B2O3Can suitably adjust the viscosity of covering slag.
3. oxidized starch adhesive starch oxidized after decrease the quantity of hydroxyl in molecule, improve the carboxyl-content in starch and carbonyl content, the quantity of hydroxyl in molecule is decreased after starch is oxidized, increase along with carboxyl-content, freeze-thaw stability is more and more stronger, gel strength reduces, thus reducing the degree of polymerization of starch, adds the water solublity of starch, cohesive force and stability. Containing substantial amounts of secondary hydroxyl and a small amount of acetoxyl group in polyvinyl alcohol molecule structure, utilizing polyvinyl alcohol and starch molecule " grafting ", polyvinyl alcohol is the unique polyhydroxylated polymer that can be dissolved in water, has excellent film property and emulsibility, glue-line intensity is high, good toughness. Porous and water absorption surface are had strong cementitiousness by its solution, so the binding agent so prepared has the advantages such as better cementability, mobility and freezing property of anticoagulant.
4. the water-reducing rate of poly carboxylic acid series water reducer is high, especially by high-performance water reducing agent and large dosage active fine additive compound, makes the service behaviour of material obtain bigger improving, advantageously reduces merit construction costs, improves construction quality.
Detailed description of the invention
Embodiment 1
A kind of ASP medium carbon steel continuous crystallizer protecting slag, as follows including raw material and weight percentage thereof: glass dust: 6%, pre-melt: 12%; wollastonite: 11.5%, fluorite: 10.5%, white alkali: 7%; carbon black: 5.5%, graphite: 6.5%, sodium fluoride: 5%; manganese carbonate: 8%; magnesia: 9%, aluminum vanadine: 12%, cryolite: 3%; binding agent: 3%, water reducer: 1%.Wherein, binding agent is the mixture of oxidized starch adhesive and drier, and drier is organic drier polyvinyl alcohol, and the weight ratio of oxidized starch adhesive and polyvinyl alcohol is: 100:1, water reducer is polycarboxylic acid water reducing agent.
Its preparation method, comprises the following steps that 1) by the powder body of glass dust, pre-melt, wollastonite, fluorite, white alkali, sodium fluoride, manganese carbonate, magnesia, aluminum vanadine and cryolite pulverizing 200 ~ 300 orders, and mix homogeneously; 2) in step 1) mixed material, add binding agent, water reducer, white carbon black and the fusing of graphite entering slag hearth, obtain melt cinder; 3) melt cinder is through Water Quenching, 500 ~ 800 DEG C of dry, pulverizing; 4) remix, mist projection granulating.
The fusion temperature of this covering slag: 1050 DEG C, the viscosity when 1300 DEG C is: 0.25Pa.s, and the basicity (CaO/SiO2) of covering slag is 0.7. This ASP medium carbon steel continuous casting covering slag is used for A steel mill, and surface quality defect is 0.36%.
Embodiment 2
A kind of ASP medium carbon steel continuous crystallizer protecting slag, as follows including raw material and weight percentage thereof: glass dust: 1%, pre-melt: 25%; wollastonite: 25%, fluorite: 11%, white alkali: 8%; carbon black: 4%, graphite: 4.5%, sodium fluoride: 1%; manganese carbonate: 1%, magnesia: 4%, aluminum vanadine: 8%; cryolite: 0.5%; binding agent: 1%, water reducer: 0.5%, Li2O0.5% and B2O35%. Binding agent is Oxytarch. The mixture of binding agent and drier, drier is organic drier polyvinyl alcohol, and the weight ratio of oxidized starch adhesive and polyvinyl alcohol is: 100:2, water preparation is polycarboxylic acid water reducing agent.
Its preparation method, comprises the following steps that 1) by the powder body of glass dust, pre-melt, wollastonite, fluorite, white alkali, sodium fluoride, manganese carbonate, magnesia, aluminum vanadine and cryolite pulverizing 200 ~ 300 orders, and mix homogeneously; 2) in step 1) mixed material, add binding agent, water reducer, white carbon black and the fusing of graphite entering slag hearth, obtain melt cinder; 3) melt cinder is through Water Quenching, 500 ~ 800 DEG C of dry, pulverizing; 4) remix, mist projection granulating.
The fusion temperature of this covering slag: 1060 DEG C, the viscosity when 1300 DEG C is: 0.30Pa.s, and the basicity (CaO/SiO2) of covering slag is 0.75. This ASP medium carbon steel continuous casting covering slag is used for A steel mill, and surface quality defect is 0.13%.
Embodiment 3
A kind of ASP medium carbon steel continuous crystallizer protecting slag, as follows including raw material and weight percentage thereof: pre-melt: 29%, wollastonite: 20%; fluorite: 10.5%, white alkali: 6%, carbon black: 5%; graphite: 5%; sodium fluoride: 5%, manganese carbonate: 5%, magnesia: 4%; aluminum vanadine: 8%; cryolite: 0.5%, binding agent: 1%, water reducer: 1%. Wherein, binding agent is the mixture of oxidized starch adhesive and drier, and drier is organic drier polyvinyl alcohol, and the weight ratio of oxidized starch adhesive and polyvinyl alcohol is: 100:3, water reducer is polycarboxylic acid water reducing agent.
Its preparation method, comprises the following steps that 1) by the powder body of glass dust, pre-melt, wollastonite, fluorite, white alkali, sodium fluoride, manganese carbonate, magnesia, aluminum vanadine and cryolite pulverizing 200 ~ 300 orders, and mix homogeneously; 2) in step 1) mixed material, add binding agent, water reducer, white carbon black and the fusing of graphite entering slag hearth, obtain melt cinder; 3) melt cinder is through Water Quenching, 500 ~ 800 DEG C of dry, pulverizing; 4) remix, mist projection granulating.
The fusion temperature of this covering slag: 1100 DEG C, the viscosity when 1300 DEG C is: 0.4Pa.s, and the basicity (CaO/SiO2) of covering slag is 0.7.This ASP medium carbon steel continuous casting covering slag is used for A steel mill, and surface quality defect is 0.33%.
Embodiment 4
A kind of ASP medium carbon steel continuous crystallizer protecting slag, as follows including raw material and weight percentage thereof: glass dust: 4%, pre-melt: 23%; wollastonite: 27%, fluorite: 13.5%, white alkali: 4%; carbon black: 4%; graphite: 4.5%, manganese carbonate: 5%, magnesia: 4%; aluminum vanadine: 8%; cryolite: 1%, binding agent: 1.7%, water reducer: 0.3%. Wherein, binding agent is the mixture of oxidized starch adhesive and drier, and drier is organic drier polyvinyl alcohol, and the weight ratio of oxidized starch adhesive and polyvinyl alcohol is: 100:4, water reducer is polycarboxylic acid water reducing agent.
Its preparation method, comprises the following steps that 1) by the powder body of glass dust, pre-melt, wollastonite, fluorite, white alkali, sodium fluoride, manganese carbonate, magnesia, aluminum vanadine and cryolite pulverizing 200 ~ 300 orders, and mix homogeneously; 2) in step 1) mixed material, add binding agent, water reducer, white carbon black and the fusing of graphite entering slag hearth, obtain melt cinder; 3) melt cinder is through Water Quenching, 500 ~ 800 DEG C of dry, pulverizing; 4) remix, mist projection granulating.
The fusion temperature of this covering slag: 1050 DEG C, the viscosity when 1300 DEG C is: 0.25Pa.s, and the basicity (CaO/SiO2) of covering slag is 0.8. This ASP medium carbon steel continuous casting covering slag is used for A steel mill, and surface quality defect is 0.35%.
Embodiment 5
A kind of ASP medium carbon steel continuous crystallizer protecting slag, as follows including raw material and weight percentage thereof: glass dust: 2%, pre-melt: 15%; wollastonite: 13%, fluorite: 10.5%, white alkali: 8%; carbon black: 8%, graphite: 8.5%, sodium fluoride: 5%; manganese carbonate: 8%; magnesia: 7.5%, aluminum vanadine: 9%, cryolite: 2.5%; binding agent: 2%, water reducer: 1%. Wherein, binding agent is the mixture of oxidized starch adhesive and drier, and drier is organic drier polyvinyl alcohol, and the weight ratio of oxidized starch adhesive and polyvinyl alcohol is: 100:5, water reducer is polycarboxylic acid water reducing agent.
Its preparation method, comprises the following steps that 1) by the powder body of glass dust, pre-melt, wollastonite, fluorite, white alkali, sodium fluoride, manganese carbonate, magnesia, aluminum vanadine and cryolite pulverizing 200 ~ 300 orders, and mix homogeneously; 2) in step 1) mixed material, add binding agent, water reducer, white carbon black and the fusing of graphite entering slag hearth, obtain melt cinder; 3) melt cinder is through Water Quenching, 500 ~ 800 DEG C of dry, pulverizing; 4) remix, mist projection granulating.
The fusion temperature of this covering slag: 1070 DEG C, the viscosity when 1300 DEG C is: 0.4Pa.s, and covering slag basicity (CaO/SiO2) is 0.8. This ASP medium carbon steel continuous casting covering slag is used for A steel mill, and surface quality defect is 0.40%.
Embodiment 6
A kind of ASP medium carbon steel continuous crystallizer protecting slag, as follows including raw material and weight percentage thereof: glass dust: 5%, pre-melt: 25%; wollastonite: 10%, fluorite: 12.5%, white alkali: 7%; carbon black: 6%, graphite: 4.5%, sodium fluoride: 2%; manganese carbonate: 7%; magnesia: 6%, aluminum vanadine: 10%, cryolite: 2%; binding agent: 2%, water reducer: 1%. Wherein, binding agent is the mixture of oxidized starch adhesive and drier, and drier is organic drier polyvinyl alcohol, and the weight ratio of oxidized starch adhesive and polyvinyl alcohol is: 100:1, water reducer is polycarboxylic acid water reducing agent.
Its preparation method, comprises the following steps that 1) by the powder body of glass dust, pre-melt, wollastonite, fluorite, white alkali, sodium fluoride, manganese carbonate, magnesia, aluminum vanadine and cryolite pulverizing 200 ~ 300 orders, and mix homogeneously;2) in step 1) mixed material, add binding agent, water reducer, white carbon black and the fusing of graphite entering slag hearth, obtain melt cinder; 3) melt cinder is through Water Quenching, 500 ~ 800 DEG C of dry, pulverizing; 4) remix, mist projection granulating.
The fusion temperature of this covering slag: 1080 DEG C, the viscosity when 1300 DEG C is: 0.33Pa.s, and the basicity (CaO/SiO2) of covering slag is 0.8. This ASP medium carbon steel continuous casting covering slag is used for A steel mill, and surface quality defect is 0.33%.
Embodiment 7
A kind of ASP medium carbon steel continuous crystallizer protecting slag, as follows including raw material and weight percentage thereof: glass dust: 3%, pre-melt: 15%; wollastonite: 15%, fluorite: 15%, white alkali: 5%; carbon black: 6%, graphite: 6%, sodium fluoride: 5%; manganese carbonate: 6%; magnesia: 7%, aluminum vanadine: 10%, cryolite: 3%; binding agent: 3%, water reducer: 1%. Wherein, binding agent is the mixture of oxidized starch adhesive and drier, and drier is organic drier polyvinyl alcohol, and the weight ratio of oxidized starch adhesive and polyvinyl alcohol is: 100:2, water reducer is polycarboxylic acid water reducing agent.
Its preparation method, comprises the following steps that 1) by the powder body of glass dust, pre-melt, wollastonite, fluorite, white alkali, sodium fluoride, manganese carbonate, magnesia, aluminum vanadine and cryolite pulverizing 200 ~ 300 orders, and mix homogeneously; 2) in step 1) mixed material, add binding agent, water reducer, white carbon black and the fusing of graphite entering slag hearth, obtain melt cinder; 3) melt cinder is through Water Quenching, 500 ~ 800 DEG C of dry, pulverizing; 4) remix, mist projection granulating.
The fusion temperature of this covering slag: 1090 DEG C, the viscosity when 1300 DEG C is: 0.30Pa.s, and the basicity (CaO/SiO2) of covering slag is 0.7. This ASP medium carbon steel continuous casting covering slag is used for A steel mill, and surface quality defect is 0.30%.
Embodiment 8
A kind of ASP medium carbon steel continuous crystallizer protecting slag, as follows including raw material and weight percentage thereof: glass dust: 6%, pre-melt: 10%; wollastonite: 20%, fluorite: 10.5%, white alkali: 4%; carbon black: 4%, graphite: 8.5%, sodium fluoride: 5%; manganese carbonate: 8%; magnesia: 5%, aluminum vanadine: 12%, cryolite: 3%; binding agent: 3%, water reducer: 1%. Wherein, binding agent is the mixture of oxidized starch adhesive and drier, and drier is organic drier polyvinyl alcohol, and the weight ratio of oxidized starch adhesive and polyvinyl alcohol is: 100:5, water reducer is polycarboxylic acid water reducing agent.
Its preparation method, comprises the following steps that 1) by the powder body of glass dust, pre-melt, wollastonite, fluorite, white alkali, sodium fluoride, manganese carbonate, magnesia, aluminum vanadine and cryolite pulverizing 200 ~ 300 orders, and mix homogeneously; 2) in step 1) mixed material, add binding agent, water reducer, white carbon black and the fusing of graphite entering slag hearth, obtain melt cinder; 3) melt cinder is through Water Quenching, 500 ~ 800 DEG C of dry, pulverizing; 4) remix, mist projection granulating.
The fusion temperature of this covering slag: 1100 DEG C, the viscosity when 1300 DEG C is: 0.35Pa.s, and the basicity (CaO/SiO2) of covering slag is 0.7. This ASP medium carbon steel continuous casting covering slag is used for A steel mill, and surface quality defect is 0.23%.
What finally illustrate is, above example is only in order to illustrate technical scheme and unrestricted, other amendments that technical scheme is made by those of ordinary skill in the art or equivalent replace, without departing from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of scope of the presently claimed invention.
Claims (7)
1. an ASP medium carbon steel continuous crystallizer protecting slag, it is characterised in that: include raw material and weight percentage is as follows: glass dust: 0% ~ 6%, pre-melt: 10% ~ 30%; wollastonite: 10% ~ 30%, fluorite: 10.5% ~ 15.5%, white alkali: 4% ~ 8%; carbon black: 4% ~ 8%; graphite: 4.5% ~ 8.5%, sodium fluoride: 0% ~ 5%, manganese carbonate: 5% ~ 8%; magnesia: 4% ~ 9%; aluminum vanadine: 8% ~ 12%, cryolite: 0.5% ~ 3%, binding agent: 1% ~ 3% and water reducer: 0.3% ~ 1%.
2. a kind of ASP medium carbon steel continuous crystallizer protecting slag as claimed in claim 1, it is characterised in that: include raw material and weight percentage is as follows: glass dust: 0% ~ 6%, pre-melt: 10% ~ 30%; wollastonite: 10% ~ 30%, fluorite: 10.5% ~ 15.5%, white alkali: 4% ~ 8%; carbon black: 6%; graphite: 6.5%, sodium fluoride: 0% ~ 5%, manganese carbonate: 5% ~ 8%; magnesia: 4% ~ 9%; aluminum vanadine: 8% ~ 12%, cryolite: 0.5% ~ 3%, binding agent: 1% ~ 3% and water reducer: 0.3% ~ 1%.
3. a kind of ASP medium carbon steel continuous crystallizer protecting slag according to claim 1 and 2, it is characterised in that: described binding agent is the mixture of oxidized starch adhesive and drier, and the weight ratio of described oxidized starch adhesive and drier is: 100:1 ~ 5.
4. a kind of ASP medium carbon steel continuous crystallizer protecting slag according to claim 3, it is characterised in that: described drier is organic drier polyvinyl alcohol.
5. a kind of ASP medium carbon steel continuous crystallizer protecting slag according to claim 1 and 2, it is characterised in that: described water reducer is polycarboxylic acid water reducing agent.
6. a kind of ASP medium carbon steel continuous crystallizer protecting slag according to claim 1 and 2; it is characterized in that: the fusion temperature of described covering slag: 1050 DEG C ~ 1100 DEG C; viscosity when 1300 DEG C is: 0.25 ~ 0.4Pa.s, the basicity (CaO/SiO of described covering slag2) it is 0.7��0.8.
7. one kind as arbitrary in claim 1 ~ 6 as described in the preparation method of covering slag, it is characterised in that: comprise the following steps that 1) glass dust, pre-melt, wollastonite, fluorite, white alkali, sodium fluoride, manganese carbonate, magnesia, aluminum vanadine and cryolite are pulverized and mix homogeneously; 2) in step 1) mixed material, add binding agent, water reducer, white carbon black and the fusing of graphite entering slag hearth, obtain melt cinder; 3) melt cinder is through Water Quenching, dry, pulverizing; 4) remix, mist projection granulating.
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| CN106583673A (en) * | 2016-12-16 | 2017-04-26 | 河南通宇冶材集团有限公司 | Continuous-casting mold flux for decreasing sticking steel breakouts and preparation method thereof |
| CN107931552A (en) * | 2017-12-28 | 2018-04-20 | 西峡龙成冶金材料有限公司 | The continuous-casting crystallizer especially used covering slag of ESP medium carbon steel |
| CN110976797A (en) * | 2019-12-25 | 2020-04-10 | 河南通宇冶材集团有限公司 | Micro-carbon covering slag for medium-high carbon steel of square and rectangular billets and preparation method thereof |
| CN111360217A (en) * | 2020-04-27 | 2020-07-03 | 西峡龙成冶金材料有限公司 | Special continuous casting crystallizer covering slag for CSP sheet billet alloy peritectic steel and application thereof |
| CN111496201A (en) * | 2020-05-26 | 2020-08-07 | 武汉钢铁有限公司 | Anti-sticking coating for copper plate of continuous casting crystallizer and continuous casting crystallizer with anti-sticking coating |
| CN112605356A (en) * | 2020-12-16 | 2021-04-06 | 西峡龙成冶金材料有限公司 | Special covering slag for austenitic stainless steel continuous casting crystallizer and application thereof |
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