CN111531140B - High titanium oxide continuous casting covering slag for titanium-containing steel - Google Patents
High titanium oxide continuous casting covering slag for titanium-containing steel Download PDFInfo
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Abstract
The invention belongs to the technical field of metallurgy, and particularly relates to a metallurgical preparation methodRelates to a high titanium oxide continuous casting protective slag for titanium-containing steel. Aiming at the problems that the high titanium steel produced by the existing continuous casting covering slag is easy to react, the covering slag is denatured, the continuous casting production is influenced, and the like, the invention provides the high titanium oxide covering slag for the titanium-containing steel, which comprises the following chemical components: 31-45% of (CaO + BaO + MgO + SrO) and SiO29～13％，Al2O318～26％，(NaF+CaF2+BaF2)10～16％，Li2O 5～10％，B2O32～4％，C 5～10％，TiO210 to 20 percent. The balance being unavoidable impurities. The invention also provides a raw material combination and a preparation method of the high titanium oxide protective slag for preparing titanium-containing steel. TiO in the continuous casting mold flux of the invention2Saturation, reactivity is low, can show the deterioration degree that reduces the covering slag, guarantees that the steel continuous casting process is smooth, casts out the titanium-containing steel casting blank that surface quality is excellent, improves the continuous casting stove number for the continuous casting stove number reaches more than 3 stoves, improves production efficiency, practices thrift the cost, has important meaning.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to high-titanium-oxide continuous casting mold powder for titanium-containing steel.
Background
In the continuous casting process, the main functions of the crystallizer casting powder comprise: (1) lubricating between the casting blank and the wall of the crystallizer; (2) controlling and improving heat transfer between the casting blank and the crystallizer; (3) secondary oxidation of the molten steel is prevented; (4) the heat insulation and heat preservation reduce the heat loss of the molten steel; (5) absorb and dissolve non-metallic inclusions in the molten steel. The lubrication and heat transfer effects are the most critical, and the breakout is directly influenced.
The titanium-containing steel has the characteristics of high strength, high toughness, high wear resistance and the like due to the precipitation of TiC, and has wide application prospect. But the continuous casting production of the titanium-containing steel is a difficult problem at home and abroad at present. One of the main factors is that titanium in steel is easy to react with the covering slag to produce TiO during continuous casting2And further, physical properties of the mold flux, including melting point, viscosity, etc., are deteriorated, resulting in solidification of the mold flux at the liquid level of the mold, failing to play a role of lubricating the continuous casting slab and causing steel leakage. At present, titanium-containing steel continuous casting covering slag on the market is mainly designed for steel with the Ti content of less than 0.1 percent, and after the Ti content of steel increases, the reaction of titanium and the covering slag is easier to carry out, so that high-titanium steel (with the Ti content of 0.1 to up to e)0.8%) is difficult to perform, and usually only one furnace is used for continuous casting.
The patent CN110315039A discloses an application of fluorine-free covering slag in titanium-containing steel continuous casting, and provides a covering slag for avoiding slag rings and fish formation on the surface of molten steel and/or nodulation at a nozzle during titanium-containing steel continuous casting, wherein CaO is 30-45%, and SiO is2 25～40％，Al2O3 2～6％，(MgO+Na2O)8～15％，Li2O 0～2％，B2O3 4～8％，(Fe2O3+ MnO) 6-10%. By introducing appropriate amounts of B2O3Controlled oxidation of formed TiO2And the precipitation of the high-melting-point perovskite crystal phase can be inhibited. However, at higher Ti contents in the steel, excessive TiO will be formed 2So that B2O3And (4) deficiency.
Patent CN104399922A discloses a novel corrosion-resistant alloy steel continuous casting covering slag and application thereof, and Al is added in a proper amount2O3And TiO 22In an amount to reduce reactivity between slag steels, wherein Al2O3 10～14％，TiO21-6%, but the content of other reactive components of the covering slag is still high, SiO2、(Na2O+Li2O) is 23-31% and 10-15%, respectively, TiO2The content is low, and the steel slag reaction is serious.
The patent CN102248141A discloses a high-alkalinity crystallizer covering slag for a niobium, vanadium and titanium containing low-alloy wide and thick plate blank and a manufacturing method thereof, wherein the covering slag comprises 38-45% of CaO and SiO2 20～27％，MgO 1～3％，Al2O3 3～5％，Fe2O3 0.75～0.96％，Na2O 4～7％，Li2O 1～3％，F～7-9%, MnO 1-4%, and C5-8%. SiO in the covering slag2And Na2The content of O component is still high, and TiO is not contained2The reactivity of the steel slag is high, and the performance of the casting powder is deteriorated.
The patent CN108127094A discloses a non-reactive covering slag for high titanium steel, which is mainly composed of components which do not react with Ti in molten steel, and comprises 9-16% of CaO and Al2O3 15～30％，BaO 20～32％，Li2O 5～12％，MgO≤2％，F～8～15％，TiO2 4～10％，C 2～12％，(Na2O+K2O+SiO2) Less than or equal to 3 percent. Because the covering slag does not contain SiO basically2In order to reduce the alkalinity, the melting temperature is controlled, and the CaO content is also lower, so that the casting powder system is changed; but TiO 22The content is less than 10 percent, and the method is only suitable for steel grades with low titanium content.
Patent CN107498013A discloses a TiO-containing material 2High-aluminium steel protecting slag and its application, TiO-contained2The high-aluminum steel casting powder comprises the following oxides in percentage by mass: 30-45% of CaO and Al2O3 16～24.5％，SiO28～16％，Na2O 8～15％，Li2O 1～5％，MgO 2～6％，BaO 3～7％，F-6～10％，TiO2 2.7～7％，(CaO+BaO)/Al2O3Is 1.0 to 2.1. The casting powder has low melting point and viscosity and good crystallization property. The covering slag is particularly suitable for continuous casting of high-aluminum steel with the Al content of 1.5-2.5% by mass. The invention is only suitable for the steel containing aluminum.
Therefore, the various covering slags have corresponding defects, and are only suitable for high-aluminum steel or SiO2High content of easily mixed TiO2Reaction of, or TiO2The content is low and is not saturated, and the prior art does not have a covering slag which can solve all the problems.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the high titanium steel produced by the existing continuous casting covering slag is easy to react, so that the modification of the covering slag is caused, the smooth running of the continuous casting production is influenced, and the multi-furnace continuous casting can not be carried out, thereby reducing the cost and the like.
The technical scheme for solving the technical problems is as follows: provides a high titanium oxide protective slag for titanium-containing steel. The chemical components of the material comprise: 31-45% of (CaO + BaO + MgO + SrO) and SiO2 9～13％，Al2O3 18～26％，(NaF+CaF2+BaF2)10～16％，Li2O 5～10％，B2O3 2～4％，C 5～10％，TiO210 to 20 percent. The balance being unavoidable impurities.
Preferably, in the titanium-containing steel high-titanium-oxide mold flux, the chemical components of the mold flux include: 31-35% of (CaO + BaO + MgO + SrO) and SiO 2 9～11％，Al2O3 18～22％，(NaF+CaF2+BaF2)10～13％，Li2O 5～7％，B2O3 2～3％，C 5～7％，TiO212-18% and the balance of unavoidable impurities.
More preferably, in the titanium-containing steel-use high titanium oxide mold flux, the chemical composition of the mold flux comprises: calculated by weight percentage, 32 percent of (CaO + BaO + MgO + SrO), and SiO2 9％，Al2O3 20％，(NaF+CaF2+BaF2)10％，Li2O 6％，B2O32％，C 6％，TiO215%, and the balance unavoidable impurities.
Wherein, in the high titanium oxide covering slag for titanium-containing steel, CaO/SiO of the covering slag21.5 to 3.3.
In the high titanium oxide covering slag for the titanium-containing steel, the covering slag comprises the following raw materials: 33-46% of (limestone + barium carbonate + magnesium carbonate + strontium oxide), 14-18% of bauxite, (barium fluoride + sodium fluoride + fluorite) 10-12%, 6-9% of quartz sand, 7-15% of titanium dioxide, 10-13% of lithium carbonate, 2-5% of boron oxide and 3-4% of carbonaceous material.
In the titanium-containing steel high-titanium-oxide covering slag, the carbonaceous material is formed by mixing graphite and carbon black according to the weight ratio of 1: 1.
Wherein, in the high titanium oxide protective slag for titanium-containing steel, CaCO in limestone3>95 percent; al in bauxite2O3>76％，SiO2<5 percent; BaCO in barium carbonate3>94 percent; MgCO in magnesium carbonate3>90 percent; SrCO in strontium carbonate3>93 percent; NaF in sodium fluoride>96 percent; BaF in barium fluoride2>96 percent; CaF in fluorite 2 85～90％，SiO2<5.0％，S<0.06 percent; TiO in titanium dioxide2>96 percent; SiO in quartz sand2>95 percent; li in lithium carbonate2CO3>97 percent; c in carbonaceous material>95% of carbon black, wherein the carbon black is more than 1%.
Wherein, in the high titanium oxide protective slag for titanium-containing steel, the viscosity of the protective slag is 0.1-0.3 Pa.S.
Wherein in the high titanium oxide protective slag for titanium-containing steel, the melting point of the protective slag is 900-1100 ℃.
Wherein, in the titanium-containing steel high titanium oxide covering slag, the titanium content in the titanium-containing steel is 0.1-0.8%.
The invention also provides a preparation method of the covering slag, which comprises the following steps:
a. weighing the raw materials according to the weight ratio;
b. mixing the rest raw materials except the carbonaceous materials, preserving heat for 30-50 min at 1350-1450 ℃ to fully and uniformly melt the raw materials, cooling and drying to obtain a pre-melted material;
c. crushing the pre-melted material, adding a carbon material with a formula amount, adding water and a binder, and grinding for 40-60 min to prepare slurry;
d. and (3) feeding the slurry into a spray particle drying tower for granulation, and preparing to obtain a finished product of the covering slag when the moisture content is less than or equal to 0.5% and the granularity reaches 0.01-2 mm.
In the preparation method of the covering slag, the particle size after crushing in the step c is 200-mesh sieve, the amount of added water is 0.9-1.1 times of the weight of the dry materials, and the amount of added binder is 1.6-2% of the weight of the dry materials.
Wherein, in the preparation method of the covering slag, the binder in the step C is organic solution C3H8O3。
Compared with the prior art, the invention has the following beneficial effects:
the invention provides the covering slag suitable for the continuous casting of the high titanium steel with the titanium content of 0.1-0.8%, and through reasonable raw material design, CaO/SiO in the covering slag is prepared21.5 to 3.3, viscosityThe temperature is 0.1-0.3 Pa.S, the melting point is 900-1100 ℃, and the general performance requirements of the continuous casting mold flux are met; in addition, TiO in the continuous casting mold flux of the invention2Saturation, reactivity is low, can show the deterioration degree that reduces the covering slag, guarantees that the steel continuous casting process is smooth, casts out the titanium-containing steel casting blank that surface quality is excellent, improves the continuous casting stove number for the continuous casting stove number reaches more than 3, compares the covering slag that can only pour a stove now, reduction in production cost. The high alkalinity and the low viscosity of the casting powder can improve the Al absorption of the casting powder2O3The ability to entrain; can effectively coordinate and control the lubricating and heat transfer characteristics. The invention provides a new continuous casting covering slag for the continuous casting of high titanium steel, so that the continuous casting quantity of the high titanium steel is increased, the production efficiency is improved, the cost is saved, and the invention has important significance.
Detailed Description
The invention provides a high titanium oxide protective slag for titanium-containing steel. The chemical components of the material comprise: in weight percent, TiO2 10～20％，(CaO+BaO+MgO+SrO)35～50％，SiO2 9～13％，Al2O3 20～28％，(NaF+CaF2+BaF2)10～20％，Li2O 6～10％，B2O32-4%, C6-10%, and the balance of inevitable impurities.
Preferably, in the titanium-containing steel high-titanium-oxide mold flux, the chemical components of the mold flux include: 35-45% of (CaO + BaO + MgO + SrO) and SiO2 9～11％，Al2O3 20～25％，(NaF+CaF2+BaF2)10～15％，Li2O 6～8％，B2O3 2～3％，C 6～8％，TiO212-18% and the balance of inevitable impurities.
More preferably, in the titanium-containing steel-use high titanium oxide mold flux, the chemical composition of the mold flux comprises: by weight percentage, (CaO + BaO + MgO + SrO) 40%, SiO2 9％，Al2O3 21％，(NaF+CaF2+BaF2)10％，Li2O 7％，B2O32.3％，C 6％，TiO215%, the balance being unavoidableThe impurities of (1).
The high titanium oxide covering slag for titanium-containing steel is added with 10-20% of TiO2To make TiO in the covering slag2Saturation, avoids the reaction of Ti and the easily oxidized components in the casting powder, thereby keeping the stable performance of the casting powder, improving the number of continuous casting furnaces and reducing the production cost.
Reactive component SiO in the casting powder of the invention2The content is set to be 9-13%. In one aspect, SiO2The content is lower than that of the traditional covering slag, and the reactivity of a slag steel interface can be reduced to a certain extent so as to slow down the performance deterioration of the covering slag; on the other hand, SiO2Is a main network former, SiO with proper content 2The stability of the structure and the performance of the casting powder can be effectively kept.
Reactive component B in the covering slag of the invention2O3The mass percentage of the steel slag is controlled to be less than 4 percent, so that the reactivity of a slag steel interface can be effectively reduced. B is2O3Is a typical cosolvent in the mold flux, but reacts with Ti in molten steel to cause the performance deterioration of the mold flux, thereby minimizing or avoiding B in the mold flux2O3Is added. Because the covering slag of the invention contains a proper amount of network forming body SiO2And Al2O3And with appropriate amounts of cosolvents F and Li2O, thus in B2O3Under the condition of less or no casting powder, the casting powder still has certain glass property and lower melting point viscosity, and meets the continuous casting requirement of titanium-containing steel, and the number of continuous casting furnaces reaches more than 3.
The component Li in the continuous casting protective slag2The mass percent of O is 6-10%, and Li2The addition of O can effectively and stably coordinate the performance of the mold flux. Li2O does not react with Ti in molten steel and has obvious effect of regulating the performance of the casting powder, so Li2O is a good choice of a cosolvent in the titanium-containing steel mold flux.
Therefore, the components in the casting powder are mutually matched, and under the combined action, the CaO/SiO of the casting powder is ensured21.5 to 3.3, 0.1 to 0.3 Pa.S of viscosity and 900 to 1100 ℃ of melting point, not only can effectively coordinate and control the lubricating and heat transfer characteristics, Also has strong absorption of Al2O3The ability to entrain.
In the high titanium oxide covering slag for the titanium-containing steel, the covering slag comprises the following raw materials: 33-46% of (limestone + barium carbonate + magnesium carbonate + strontium oxide), 14-18% of bauxite, (barium fluoride + sodium fluoride + fluorite) 10-12%, 6-9% of quartz sand, 7-15% of titanium dioxide, 10-13% of lithium carbonate, 2-5% of boron oxide and 3-4% of carbonaceous material.
In the titanium-containing steel high-titanium-oxide covering slag, the carbonaceous material is formed by mixing graphite and carbon black according to the weight ratio of 1: 1.
Wherein, in the high titanium oxide protective slag for titanium-containing steel, CaCO in limestone3>95 percent; al in bauxite2O3>76％，SiO2<5 percent; BaCO in barium carbonate3>94 percent; MgCO in magnesium carbonate3>90 percent; SrCO in strontium carbonate3>93 percent; NaF in sodium fluoride>96 percent; BaF in barium fluoride2>96 percent; CaF in fluorite2 85～90％，SiO2<5.0％，S<0.06 percent; TiO in titanium dioxide2>96 percent; SiO in quartz sand2>95 percent; li in lithium carbonate2CO3>97 percent; c in carbonaceous material>95% of carbon black, wherein the carbon black is more than 1%.
The raw materials for preparing the casting powder adopted by the invention are common raw materials, have wide sources and low cost. When the invention is used, the raw materials do not need to be matched, and all the raw materials which can ensure that the chemical components and the performance meet the requirements of the protective slag can be adopted.
Wherein, in the titanium-containing steel high titanium oxide covering slag, the titanium content in the titanium-containing steel is 0.1-0.8%.
The invention also provides a preparation method of the covering slag, which comprises the following steps:
a. weighing the raw materials according to the weight ratio;
b. mixing the rest raw materials except the carbonaceous material, preserving heat for 30-50 min at 1350-1450 ℃ to ensure that the raw materials are fully and uniformly melted, cooling and drying to obtain a pre-melted material;
c. crushing the pre-melted material, adding a carbonaceous material with a formula amount, adding water and a binder, and grinding for 40-60 min to prepare slurry;
d. and (3) feeding the slurry into a spray particle drying tower for granulation, and preparing to obtain a finished product of the covering slag when the moisture content is less than or equal to 0.5% and the granularity reaches 0.01-2 mm.
In the preparation method of the covering slag, the particle size after crushing in the step c is 200-mesh sieve, the amount of added water is 0.9-1.1 times of the weight of the dry materials, and the amount of added binder is 1.6-2% of the weight of the dry materials.
Wherein, in the preparation method of the covering slag, the binder in the step C is organic solution C3H8O3。
The following examples are intended to illustrate specific embodiments of the present invention without limiting the scope of the invention to the examples.
Example 1 continuous casting of high titanium oxide mold flux for titanium-containing steel according to the present invention
The specific operation mode is as follows:
the method is used for producing steel containing 0.11 percent of titanium, and the main components of the mold flux are as follows: calculated by weight percentage, CaO 26.8 percent, BaO 5 percent and SiO2 13％，Al2O3 18.3％，BaF2 10.2％，Li2O 6.5％，B2O3 4％，C 6.4％，TiO210.5 percent. The physical properties are as follows: melting point 950 deg.C, viscosity 0.202 Pa.S at 1300 deg.C.
The crystallizer casting powder for titanium-containing steel continuous casting is prepared from the following raw materials: according to weight percentage, 35 percent of limestone, 15 percent of bauxite, 5 percent of barium carbonate, 8 percent of calcium fluoride, 7 percent of titanium dioxide, 13 percent of lithium carbonate, 4.2 percent of boron oxide, 8.5 percent of quartz sand and 4.5 percent of carbonaceous material (graphite and carbon black).
The raw materials are proportioned according to the requirements of chemical components, ground into fine powder and uniformly mixed, and then are subjected to pre-melting treatment to form complex solid solution among all the materials and release CO in carbonate2And water volatile matter, cooling, crushing and grinding into grain sizeAnd (3) adding fine powder smaller than 200 meshes into the mixture, adding a proper amount of carbon black and graphite carbon materials, mechanically mixing, and obtaining granular finished slag through spray drying equipment.
The obtained casting powder is used for producing a titanium-containing steel ([ Ti ] ═ 0.11%) plate blank, and the result shows that the liquid level condition of a crystallizer is good in the casting process, the performance of the casting powder is stable, the surface and the subcutaneous quality of the produced casting blank are good, the original qualified rate of the casting blank reaches more than 99%, and the number of continuous casting furnaces is more than 5.
Example 2 continuous casting of high titanium oxide mold flux for titanium-containing Steel according to the invention
The specific operation mode is as follows:
the method is used for producing steel containing 0.8 percent of titanium, and the main components of the casting powder are as follows: by weight percentage, CaO 26%, MgO 2.0%, SrO 3%, SiO2 9％，Al2O3 18.3％，CaF2 5.1％，BaF2 5％，Li2O 5％，B2O3 2％，C 5％；TiO219.5 percent. The physical properties are as follows: the melting point is 990 ℃, the viscosity is 0.142 Pa.S at 1300 ℃.
The crystallizer casting powder for titanium-containing steel continuous casting is prepared from the following raw materials: 36 percent of limestone, 17.6 percent of bauxite, 2.4 percent of magnesium carbonate, 3.4 percent of strontium carbonate, 2.3 percent of barium fluoride, 2.5 percent of calcium fluoride, 14.6 percent of titanium dioxide, 10 percent of lithium carbonate, 2.4 percent of boron oxide, 6.4 percent of quartz sand and 3.8 percent of carbonaceous material (graphite and carbon black).
The raw materials are proportioned according to the requirements of chemical components, ground into fine powder and uniformly mixed, and then are subjected to pre-melting treatment to form complex solid solution among all the materials and release CO in carbonate2And water volatile matters are cooled and crushed by water, and then ground into fine powder with the particle size of less than 200 meshes, and then proper carbon black and graphite carbon materials are added for mechanical mixing, and granular finished slag is obtained by spray drying equipment.
The obtained casting powder is used for producing a titanium-containing steel ([ Ti ] ═ 0.8%) plate blank, and the result shows that the liquid level condition of a crystallizer is good in the casting process, the performance of the casting powder is stable, the surface and the subcutaneous quality of the produced casting blank are good, the original qualified rate of the casting blank reaches more than 90%, and the number of continuous casting furnaces is 3.
Example 3 continuous casting of high titanium oxide mold flux for titanium-containing Steel according to the invention
The specific operation mode is as follows:
the method is used for producing steel containing 0.5 percent of titanium, and the main components of the casting powder are as follows: according to weight percentage, CaO 20%, MgO 3%, SrO 5%, BaO 2%, SiO2 11％，Al2O3 18％，CaF2 3％，BaF2 3％，NaF 5％，Li2O 7％，B2O3 3％，C 5％，TiO215 percent. The physical properties are as follows: melting point 960 deg.C, viscosity 0.18Pa · S at 1300 deg.C.
The crystallizer casting powder for titanium-containing steel continuous casting is prepared from the following raw materials: by weight percentage, limestone 26%, magnesium carbonate 3%, strontium carbonate 5.5%, barium carbonate 2.5%, bauxite 16%, calcium fluoride 2%, barium fluoride 2%, sodium fluoride 5%, titanium dioxide 10%, lithium carbonate 12%, boron oxide 3.2%, quartz sand 7.5%, and carbonaceous material 4% (graphite and carbon black).
The raw materials are proportioned according to the requirements of chemical components, ground into fine powder and uniformly mixed, and then are subjected to pre-melting treatment to form complex solid solution among all the materials and release CO in carbonate2And water volatile matters are cooled, crushed and ground into fine powder with the particle size of less than 200 meshes, then proper carbon black and graphite carbon materials are added, mechanical mixing is carried out, and granular finished slag is obtained through spray drying equipment.
The obtained casting powder is used for producing a titanium-containing steel ([ Ti ] ═ 0.5%) plate blank, and the result shows that the liquid level condition of a crystallizer is good in the casting process, the performance of the casting powder is stable, the surface and the subcutaneous quality of the produced casting blank are good, the original qualified rate of the casting blank reaches more than 96%, and the number of continuous casting furnaces is more than 4.
Comparative example 4 continuous casting using mold flux outside the scope of the present invention
The specific operation mode is as follows:
the method is used for producing steel containing 0.8 percent of titanium, and the main components of the casting powder are as follows: by weight percentage, CaO 30%, BaO 5.0%, SiO2 19％，Al2O3 20.3％，BaF2 10.5％，Li2O 6％，B2O3 6％，C 6％；TiO28.5 percent. The physical properties are as follows: melting point 1044 deg.C, viscosity 0.16 Pa.S at 1300 deg.C.
The crystallizer casting powder for titanium-containing steel continuous casting is prepared from the following raw materials: by weight percentage, limestone 40%, bauxite 17.2%, barium carbonate 4.8%, barium fluoride 3.6%, titanium dioxide 6.6%, lithium carbonate 10.2%, boron oxide 3.4%, quartz sand 10%, and carbonaceous material 5.2% (graphite and carbon black).
The raw materials are proportioned according to the requirements of chemical components, ground into fine powder and uniformly mixed, and then are subjected to pre-melting treatment to form complex solid solution among all the materials and release CO in carbonate2And water volatile matters are cooled and crushed by water, and then ground into fine powder with the particle size of less than 200 meshes, and then proper carbon black and graphite carbon materials are added for mechanical mixing, and granular finished slag is obtained by spray drying equipment.
The obtained casting powder is used for producing a titanium-containing steel ([ Ti ] ═ 0.8%) slab, and the results show that the crystallizer liquid level fluctuation is large in the casting process, the performance of the casting powder is unstable, the slagging phenomenon exists, the surface and the subcutaneous quality of the produced casting blank are poor, the original qualified rate of the casting blank reaches 48%, and the continuous casting cannot be carried out.
Claims (10)
1. The high titanium oxide protective slag for the titanium-containing steel is characterized by comprising the following chemical components: 31-45% of (CaO + BaO + MgO + SrO) and SiO2 9％，Al2O3 18～26％，(NaF+CaF2+BaF2)10～16％，Li2O 6.5～10％，B2O3 2～3％，C 5～10％，TiO210.5-20%, and the balance of unavoidable impurities.
2. The high titanium oxide mold flux for titanium-containing steel according to claim 1, wherein the chemical composition comprises: 31-35% of (CaO + BaO + MgO + SrO) and SiO2 9％，Al2O3 18～22％，(NaF+CaF2+BaF2)10～13％，Li2O 6.5～7％，B2O3 2～3％，C 5～7％，TiO212-18% and the balance of inevitable impurities.
3. The high titanium oxide mold flux for titanium-containing steel according to claim 1, characterized in that the chemical composition comprises: by weight percentage, (CaO + BaO + MgO + SrO) 32%, SiO2 9％，Al2O3 20％，(NaF+CaF2+BaF2)10％，Li2O 6.5％，B2O3 2％，C 6％，TiO215%, and the balance unavoidable impurities.
4. The high titanium oxide mold flux for titanium-containing steel according to claim 1, characterized in that: CaO/SiO of the covering slag21.5 to 3.3.
5. The high titanium oxide mold flux for titanium-containing steel according to claim 1, characterized in that: the casting powder comprises the following raw materials: 33-46% of (limestone + barium carbonate + magnesium carbonate + strontium oxide), 14-18% of bauxite, (barium fluoride + sodium fluoride + fluorite) 10-12%, 6-9% of quartz sand, 7-15% of titanium dioxide, 10-13% of lithium carbonate, 2-5% of boron oxide and 3-4% of carbonaceous material.
6. The high titanium oxide mold flux for titanium-containing steel according to claim 5, characterized in that: the carbonaceous material is formed by mixing graphite and carbon black according to the weight ratio of 1: 1.
7. The high titanium oxide mold flux for titanium-containing steel according to claim 5, characterized in that: CaCO in the limestone3>95 percent; al in bauxite2O3>76％，SiO2<5 percent; BaCO in barium carbonate3>94 percent; MgCO in magnesium carbonate3>90 percent; SrCO in strontium carbonate3>93 percent; NaF in sodium fluoride>96 percent; fluorineBaF in barium sulfide2>96 percent; CaF in fluorite2 85～90％，SiO2<5.0％，S<0.06 percent; TiO in titanium dioxide2>96 percent; SiO in quartz sand2>95 percent; li in lithium carbonate2CO3>97 percent; c in carbonaceous material>95% of carbon black, wherein the carbon black is more than 1%.
8. The method for producing a mold flux according to any one of claims 1 to 7, characterized by comprising the steps of:
a. weighing the raw materials according to the weight ratio;
b. mixing the rest raw materials except the carbonaceous materials, preserving heat for 30-50 min at 1350-1450 ℃ to fully and uniformly melt the raw materials, cooling and drying to obtain a pre-melted material;
c. crushing the pre-melted material, adding a carbon material with a formula amount, adding water and a binder, and grinding for 40-60 min to prepare slurry;
d. and (3) feeding the slurry into a spray particle drying tower for granulation, and preparing to obtain a finished product of the covering slag when the moisture content is less than or equal to 0.5% and the granularity reaches 0.01-2 mm.
9. The method for producing mold flux according to claim 8, characterized in that: and c, sieving the crushed particles with a 200-mesh sieve, wherein the added water accounts for 0.9-1.1 times of the weight of the dry materials, and the added binder accounts for 1.6-2% of the weight of the dry materials.
10. The method for producing mold flux according to claim 8, characterized in that: step C, the binder is organic solution C3H8O3。
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| CN113102702B (en) * | 2021-04-09 | 2022-05-31 | 东北大学 | High-basicity low-reactivity continuous casting covering slag for high-titanium steel and preparation method thereof |
| CN113714477A (en) * | 2021-09-09 | 2021-11-30 | 张家口汇德冶金材料有限公司 | Formula and production process of low-carbon covering slag containing titanium stainless steel |
| CN113953472B (en) * | 2021-11-02 | 2023-02-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Continuous casting covering slag for high titanium steel and preparation method thereof |
| CN114029462B (en) * | 2021-11-15 | 2023-03-28 | 东北大学 | Rare earth oxide-containing continuous casting mold flux for high-titanium low-aluminum steel and preparation method thereof |
| CN114713782B (en) * | 2022-05-10 | 2024-04-02 | 江苏嘉耐高温材料股份有限公司 | Premelting crystallizer covering slag for rare earth stainless steel and preparation method |
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