CN114769533A - Function protection material for continuous casting crystallizer for industrial pure iron - Google Patents
Function protection material for continuous casting crystallizer for industrial pure iron Download PDFInfo
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- CN114769533A CN114769533A CN202210344781.0A CN202210344781A CN114769533A CN 114769533 A CN114769533 A CN 114769533A CN 202210344781 A CN202210344781 A CN 202210344781A CN 114769533 A CN114769533 A CN 114769533A
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- pure iron
- continuous casting
- industrial pure
- casting mold
- crystallizer
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 86
- 239000000463 material Substances 0.000 title claims abstract description 49
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 43
- 238000009749 continuous casting Methods 0.000 title claims abstract description 34
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 24
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000000843 powder Substances 0.000 claims abstract description 21
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 18
- 238000002844 melting Methods 0.000 claims abstract description 17
- 230000008018 melting Effects 0.000 claims abstract description 17
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 239000011230 binding agent Substances 0.000 claims abstract description 8
- 239000006229 carbon black Substances 0.000 claims abstract description 6
- 239000010439 graphite Substances 0.000 claims abstract description 6
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 6
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 5
- 239000010436 fluorite Substances 0.000 claims abstract description 5
- 239000010456 wollastonite Substances 0.000 claims abstract description 5
- 229910052882 wollastonite Inorganic materials 0.000 claims abstract description 5
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052656 albite Inorganic materials 0.000 claims abstract description 4
- 229910001570 bauxite Inorganic materials 0.000 claims abstract description 4
- 229910052796 boron Inorganic materials 0.000 claims abstract description 4
- 239000011521 glass Substances 0.000 claims abstract description 4
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims abstract description 4
- 229910052808 lithium carbonate Inorganic materials 0.000 claims abstract description 4
- 239000002893 slag Substances 0.000 claims description 40
- 239000000126 substance Substances 0.000 claims description 14
- 230000001681 protective effect Effects 0.000 claims description 12
- 229910000272 alkali metal oxide Inorganic materials 0.000 claims description 8
- 238000005469 granulation Methods 0.000 claims description 6
- 230000003179 granulation Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- ODLMAHJVESYWTB-UHFFFAOYSA-N propylbenzene Chemical compound CCCC1=CC=CC=C1 ODLMAHJVESYWTB-UHFFFAOYSA-N 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 6
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 5
- 229910052593 corundum Inorganic materials 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000011573 trace mineral Substances 0.000 claims description 4
- 235000013619 trace mineral Nutrition 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 238000000498 ball milling Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 238000004537 pulping Methods 0.000 claims description 3
- 229910052681 coesite Inorganic materials 0.000 claims description 2
- 229910052906 cristobalite Inorganic materials 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 229910052682 stishovite Inorganic materials 0.000 claims description 2
- 229910052905 tridymite Inorganic materials 0.000 claims description 2
- 238000005266 casting Methods 0.000 abstract description 21
- 230000000694 effects Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000004321 preservation Methods 0.000 abstract description 4
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 230000004907 flux Effects 0.000 description 7
- 239000007788 liquid Substances 0.000 description 7
- 238000003723 Smelting Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000003575 carbonaceous material Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Inorganic materials [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000001050 lubricating effect Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 229910018557 Si O Inorganic materials 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical group [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 229910001515 alkali metal fluoride Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- AYJRCSIUFZENHW-DEQYMQKBSA-L barium(2+);oxomethanediolate Chemical compound [Ba+2].[O-][14C]([O-])=O AYJRCSIUFZENHW-DEQYMQKBSA-L 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000006148 magnetic separator Substances 0.000 description 1
- 230000005499 meniscus Effects 0.000 description 1
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- 239000003223 protective agent Substances 0.000 description 1
- 229910052701 rubidium Inorganic materials 0.000 description 1
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 description 1
- 239000003238 silicate melt Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 238000004017 vitrification Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a function protection material for a continuous casting crystallizer for industrial pure iron, which is prepared from the following raw materials in percentage by weight: 30.0-36.0% of premelting material, 15.0-17.0% of wollastonite, 9.0-12.0% of albite powder, 2.0-3.0% of lithium carbonate, 14.0-16.0% of fluorite, 2.0-3.0% of dead burned magnesia, 3.0-5.0% of boron glass powder, 2.0-4.0% of graphite carbon, 2.0-4% of imported carbon black, 5.0-8.0% of bauxite and 2.0-3.5% of binding agent. The casting powder disclosed by the invention not only ensures the heat preservation effect and the melting effect, but also effectively avoids the problems of recarburization and carburization of the surface of a casting blank, and ensures that the production is smooth and the qualified rate of the surface of the casting blank reaches more than 99%.
Description
Technical Field
The invention relates to the technical field of metallurgical auxiliary materials, in particular to a function protection material for a continuous casting crystallizer for industrial pure iron.
Background
The continuous casting covering slag is used as an important metallurgical auxiliary material for guaranteeing the smooth continuous casting, has obvious influence on the smooth continuous casting production and the quality guarantee of casting blanks, and has a continuous casting ratio of over 95 percent internationally along with the rapid development of continuous casting technology. The industrial pure iron is pure iron with the iron content of more than 99 percent and the carbon content of 0.04 percent, and requires low smelting harmful elements. The industrial pure iron is classified into electrician pure iron (electromagnetic pure iron), raw material pure iron (furnace charge pure iron) and military pure iron. The electrician pure iron has good conductivity and magnetic conductivity, and is mainly used for the production and manufacture of electromagnetic products (such as electromagnetic clutches, electromagnetic relays, electromagnetic brakes, electromagnetic valves, magnetic locks, electromagnetic switches, high-voltage switches and the like), instruments and meters, machine tool electric appliances, hot galvanizing pots, magnetic separators, iron removers and the like. The raw material pure iron has the carbon content of less than 0.002 percent, the P content of less than 0.005 percent and the S content of less than 0.004 percent, and is mainly used for smelting rubidium precision alloy, high-temperature alloy, ultra-low carbon stainless steel, electrothermal alloy and the like. The military pure iron product is mainly used on various precision instruments, spacecrafts and elements of national defense advanced science and technology, and has optimal vacuum property and airtightness. With the rapid development of industrial technology, the high-end application field of industrial pure iron becomes wider and wider. Because of the product characteristics of the industrial pure iron, the carbon content is very low, and therefore, the smelting and casting processes are very sensitive to carbon elements. However, carbon is an important component in the continuous casting mold flux, controls the melting and heat preservation functions of the mold flux, and the carbon distribution amount must be sufficiently low when designing the formula in order to avoid the carbon in the continuous casting mold flux from polluting molten steel. The content of industrial pure iron carbon is less than 0.04%, no peritectic reaction is generated in the solidification process, but the solidification shrinkage is large at a meniscus. Therefore, the emphasis of the industrial pure iron continuous casting mold flux is also on lubrication, and the mold flux absorption capacity is required to be good to prevent slag inclusion and slag adhesion on the surface of a casting slab. Therefore, the industrial pure iron mold flux must satisfy the following requirements:
1. the melting speed is high, and a stable three-layer structure of a powder slag layer, a sintering layer and a liquid slag layer can be formed as soon as possible when the powder slag layer, the sintering layer and the liquid slag layer are added into a crystallizer, so that the consumption of liquid slag can be supplemented quickly and timely;
2. the proper viscosity is designed to promote the uniform inflow of the casting powder, a slag film with proper thickness and uniform distribution is formed between the wall of the crystallizer and the blank shell, the blank shell is prevented from being directly contacted with the wall of the crystallizer so as to reduce the friction force, the heat dissipation of the crystallizer is uniform, the bonding steel leakage is prevented, and the defect on the surface of a casting blank is avoided;
3. ensuring the sufficient thickness of a slag layer and preventing liquid slag from flowing into fluctuation and involving semi-molten materials when the pulling speed fluctuates;
4. the slag protecting agent has good function of absorbing floating inclusions in molten steel, enables the uniformity of the molten slag to be stable, and prevents the modification of the protecting slag in the middle and later casting periods;
5. has the capability of preventing the surface of the billet from being carburized and partially carburized.
Patent document CN 101745615A discloses a continuous casting mould for bloom low carbon steelThe crystal function protection material comprises the following raw materials: the melting material, barium carbonate, sodium carbonate, fluorite, wollastonite, graphite carbon, fused magnesia, carbon black and bentonite respectively account for 46 percent, 5.0 percent, 7.0 percent, 4.0 percent, 18.0 percent, 10.0 percent, 4.0 percent and 2.0 percent by weight, and the melting material comprises the components of SiO according to the weight percentage228％、CaO 40％、Al2O3 4.0％、R29.0 percent of O, 7 percent of F, 5.0 percent of MgO, and the balance of ignition loss. The invention has good spreadability, heat preservation and melting performance in the crystallizer; the heat transfer capacity in the crystallizer is stable and uniform, and the requirement of the pulling speed in a fluctuation range is met; the test slag strips are small, the phenomenon of uneven inflow is improved, the functional protection material has good lubricity, and the adhesive steel leakage is prevented. However, the binary alkalinity of the protective material is higher, the melting speed of the protective material is low, the lubricity is poor, and the carbon content is high, so that the protective material is not suitable for continuous casting of industrial pure iron.
Disclosure of Invention
In view of this, the present invention provides a functional protection material for a continuous casting mold for industrial pure iron, which is directed to the defects of the prior art.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a function protection material of a continuous casting crystallizer for industrial pure iron is prepared from the following raw materials in percentage by weight: 30.0-36.0% of premelting material, 15.0-18.0% of wollastonite, 9.0-12.0% of albite powder, 2.0-3.0% of lithium carbonate, 13.0-16.0% of fluorite, 2.0-3.0% of dead burned magnesia, 3.0-5.0% of boron glass powder, 2.0-4.0% of graphite carbon, 2.0-4.0% of carbon black, 5.0-8.0% of bauxite and 2.0-3.5% of binding agent.
Further, the pre-melting material comprises the following chemical components in percentage by weight: SiO 22 42-46％，CaO 18-22％，Al2O3 8-10％，R2O 10-14％、F—8-10 percent of MgO 2.2-3.7 percent of trace elements in balance, wherein R2O＝K2O+Na2O。
Furthermore, the binary alkalinity of the functional protection material of the continuous casting crystallizer for the industrial pure iron is 0.70-0.85, the hemispherical point 1060-1130 ℃ and the viscosity at 1300 ℃ is 0.50-0.80Pa s.
Further, the binder is a 1-51% strength aqueous solution of phenyl propane.
Furthermore, the chemical components and the weight percentage of the chemical components of the continuous casting crystallizer function protection material special for the industrial pure iron are SiO2 37.0-40.0％，CaO 28.0-32.0％，Al2O3 4.5-7.0％，R2O 5.5-9.0％、F—5.0-7.0 percent of MgO, 2.0-3.0 percent of MgO, 5.0-7.0 percent of free carbon and the balance of trace elements, wherein R is2O＝K2O+Na2O。
Further, the preparation method of the continuous casting crystallizer function protection material for the industrial pure iron comprises the following steps:
step 1: crushing each solid raw material into fine powder of 200-400 meshes;
and 2, step: adding clear water to enable the pulping concentration to be 57-63%, and then carrying out ball milling for more than or equal to 60 min;
and 3, step 3: and (4) carrying out spray granulation to obtain the hollow granular covering slag.
Preferably, the spray granulation temperature is 400-600 ℃, the particle diameter of the covering slag is 0.15-1.0 mm, and the water content of the covering slag is less than or equal to 0.30%.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, a large amount of pre-melting materials are added into the casting powder, so that the casting powder has higher melting stability; in order to prevent carburetion, the adding amount of the carbonaceous material is controlled, a small amount of imported carbon black is used to match with graphite carbon, so that the skeleton effect is well achieved, the melting speed is controlled, and meanwhile, the sufficient heat preservation effect is ensured; according to the invention, the carbonate of the alkali metal is added into the covering slag, and the heat release quantity of the molten steel in the crystallizer is utilized to ensure that the carbonate absorbs heat and decomposes, so that the melting speed of the covering slag is reduced; by adding the chemical flux, the vitrification characteristic of the functional protection material can be improved, the lubricating capability of the functional protection material is improved, the melting uniformity of the functional protection material can be improved, and good melting characteristic can be obtained; according to the invention, the covering slag is added with the high-quality binder, the binder burns before the carbonaceous material and emits gas, so that the consumption of the carbonaceous material is reduced, and meanwhile, the residues after the binder burns and the carbonaceous material jointly prevent the base material from forming sintered blocks and slag strips, so that the melting speed of the covering slag can be controlled, the thickness of a slag layer is kept stable, and the quality of a casting blank is improved. According to the invention, various raw materials are used together, and the obtained covering slag has the binary alkalinity of 0.70-0.85, is proper and has a good lubricating effect; the hemisphere point is 1060-; the viscosity is 0.50-0.80 Pa.s at 1300 ℃, the viscosity is moderate, the slag film on the surface of the solidified shell of the casting blank at the upper part of the crystallizer is in a viscous flow state, the depth of vibration marks and slag inclusion of vibration mark troughs are reduced, the adhesive force of slag to the vibration marks is reduced, the inflow of liquid slag is well controlled, and the quality of the casting blank is improved.
2. According to the invention, a composite silicate structure is formed among chemical components of the covering slag, Si-O tetrahedrons are connected by sharing two corners to form a long chain, and when MgO, CaO, Na2O, F-divalent or monovalent alkali metal oxide and fluoride are added into a silicate melt, the network structure of the Si-O tetrahedrons is damaged, and the deformation resistance of the chain is reduced due to the increase of fractures, so that the crystallization temperature of the covering slag is reduced, and the surface tension is improved. The viscosity-temperature curve has a gentle trend in the cooling process at 1300 ℃, the slag film is slowly crystallized and solidified, and the friction force in the slag film lubricating process is lower, so that the blank shell scratches caused by large friction force are reduced, and the phenomena of breaking and steel leakage in the casting process are reduced; the invention can stabilize the liquid level of the crystallizer well, the obtained casting powder can not only meet the requirement of the crystallizer lubrication during low-temperature casting, but also ensure better stability of the slag, better casting blank quality, no carburization and no carburization, and can meet the requirement of users.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to some specific embodiments. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the description of the embodiments of the invention given above, are within the scope of protection of the invention.
The raw materials and weight percentages thereof for the functional protective materials of the continuous casting crystallizer for industrial pure iron of examples 1 to 7 of the present invention are shown in table 1.
The chemical compositions and weight percentages of the functional protective materials for the continuous casting crystallizer for industrial pure iron of the embodiments 1-7 of the present invention are shown in table 2.
The chemical composition and weight percent of the pre-melted materials of examples 1-7 of the present invention are shown in Table 3.
The physical and chemical properties of the continuous casting mold function protecting materials for industrial pure iron of examples 1 to 7 of the present invention are shown in Table 4.
The preparation method of the continuous casting crystallizer function protection material for the industrial pure iron comprises the following steps: respectively crushing the pre-melted material, wollastonite, albite powder, lithium carbonate, fluorite, dead burned magnesia, boron glass powder, graphite carbon, carbon black and bauxite into fine powder of 200-400 meshes, mixing, adding clear water to make the pulping concentration reach 57-63%, adding 1-51% phenyl propane aqueous solution, then ball-milling for more than or equal to 60min, and carrying out spray granulation to obtain hollow granular mold powder, wherein the spray granulation temperature is 400-600 ℃, the particle diameter of the mold powder is 0.15-1.0 mm, and the moisture content of the mold powder is less than or equal to 0.30%.
TABLE 1 weight percentages (wt%) of various raw materials of the functional protective materials of examples 1 to 7 of the present invention
TABLE 2 weight percents (wt%) of chemical components of the functional protective materials of examples 1 to 7 of the present invention
TABLE 3 weight percent (wt%) chemical composition of premelted materials of inventive examples 1-7
TABLE 4 Properties of the functional protective materials of examples 1 to 7 according to the invention
Application test
The process flow of casting industrial pure iron in a certain steel plant is as follows: converter smelting → LF → RH → square billet continuous casting, wherein the square billet continuous casting is 6 machines 6 of well smelting design and flows 8 meters of arc square billet conticaster, crystallizer copper pipe effective length 900mm, the pouring section: 200 × 220mm, casting pull rate: 1.0-1.6m/min, and the chemical composition of the industrial pure iron using the functional protective material of examples 1-7 of the present invention is shown in Table 5 below.
TABLE 5 composition of industrial pure iron and molten steel of the present invention
The field test shows that: the functional protection material can be well spread in the crystallizer, the flame is moderate, the melting is uniform, the slag strips are few, the thickness of liquid slag is 6-10mm, the consumption of each ton of steel slag is 0.28-0.35 Kg/ton, the surface quality of a casting blank is good, the surface non-cleaning rate is more than 98 percent, and the requirements of users can be met.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. A function protection material of a continuous casting crystallizer for industrial pure iron is characterized by being prepared from the following raw materials in percentage by weight:
30.0-36.0% of premelting material, 15.0-18.0% of wollastonite, 9.0-12.0% of albite powder, 2.0-3.0% of lithium carbonate, 13.0-16.0% of fluorite, 2.0-3.0% of dead burnt magnesia, 3.0-5.0% of boron glass powder, 2.0-4.0% of graphite carbon, 2.0-4.0% of carbon black, 5.0-8.0% of bauxite and 2.0-3.5% of binder.
2. The continuous casting mold function protecting material for industrial pure iron according to claim 1, wherein: the pre-melting material comprises the following chemical components in percentage by weight: SiO 22 42-46％，CaO 18-22％，Al2O3 8-10％，R2O 10-14％、F—8-10 percent of MgO 2.2-3.7 percent of trace elements in balance, wherein R2O＝K2O+Na2O。
3. The continuous casting mold function protecting material for industrial pure iron according to claim 1, wherein: the binary alkalinity of the continuous casting crystallizer function protection material for the industrial pure iron is 0.70-0.85, the hemispherical point 1060-1130 ℃, and the viscosity at 1300 ℃ is 0.50-0.80 Pa.s.
4. The functional protective material for a continuous casting mold for industrial pure iron according to claim 1, wherein: the binder is a 1-51% concentration phenyl propane aqueous solution.
5. The continuous casting mold function protecting material for industrial pure iron according to claim 1, wherein: the chemical components and the weight percentage of the chemical components of the continuous casting crystallizer function protection material special for the industrial pure iron are SiO2 37.0-40.0％，CaO 28.0-32.0％，Al2O3 4.5-7.0％，R2O 5.5-9.0％、F—5.0-7.0%, MgO 2.0-3.0%, free carbon 5.0-7.0%, and trace elements in balance, wherein R2O＝K2O+Na2O。
6. The method for preparing a functional protective material for a continuous casting mold for industrial pure iron according to claim 1, comprising the steps of:
step 1: crushing each solid raw material into fine powder of 200-400 meshes;
and 2, step: adding clear water to make the pulping concentration 57-63%, and then carrying out ball milling for more than or equal to 60 min;
and 3, step 3: and (4) carrying out spray granulation to obtain the hollow granular covering slag.
7. The method for preparing a functional protective material for a continuous casting mold for industrial pure iron according to claim 6, wherein: in the step 3, the temperature of spray granulation is 400-600 ℃, the particle diameter of the covering slag is 0.15-1.0 mm, and the water content of the covering slag is less than or equal to 0.30%.
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| CN202210344781.0A CN114769533A (en) | 2022-03-31 | 2022-03-31 | Function protection material for continuous casting crystallizer for industrial pure iron |
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| CN202210344781.0A CN114769533A (en) | 2022-03-31 | 2022-03-31 | Function protection material for continuous casting crystallizer for industrial pure iron |
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| CN202210344781.0A Pending CN114769533A (en) | 2022-03-31 | 2022-03-31 | Function protection material for continuous casting crystallizer for industrial pure iron |
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| CN102009141A (en) * | 2010-08-09 | 2011-04-13 | 河南省西保冶材集团有限公司 | Function protection material for medium and low carbon tool and die steel special continuous casting crystallizer |
| CN102019384A (en) * | 2010-12-08 | 2011-04-20 | 西峡龙成冶金材料有限公司 | High-viscosity continuous casting protective slag for solving slag inclusion on surface of low-carbon steel |
| CN104588602A (en) * | 2015-02-27 | 2015-05-06 | 河南省西保冶材集团有限公司 | Function protection material of special continuous casting crystallizer for internal combustion engine intake valve steel |
| CN104624997A (en) * | 2015-03-04 | 2015-05-20 | 西峡龙成冶金材料有限公司 | Continuous casting mold flux for boron containing steel |
| CN111230058A (en) * | 2020-03-31 | 2020-06-05 | 西峡县西保冶金材料有限公司 | Continuous casting crystallizer function protection material for air valve steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE3742415C1 (en) * | 1987-12-15 | 1988-12-01 | Frank & Schulte Gmbh | Covering bulk material for covering liquid pig iron or steel in metallurgical vessels |
| JPH04294849A (en) * | 1991-03-20 | 1992-10-19 | Shinagawa Refract Co Ltd | Mold powder for continuous casting |
| CN101837436A (en) * | 2010-04-07 | 2010-09-22 | 河南省西保冶材集团有限公司 | Function protecting material for special ASP ultra-low carbon continuous casting crystallizer |
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| CN104588602A (en) * | 2015-02-27 | 2015-05-06 | 河南省西保冶材集团有限公司 | Function protection material of special continuous casting crystallizer for internal combustion engine intake valve steel |
| CN104624997A (en) * | 2015-03-04 | 2015-05-20 | 西峡龙成冶金材料有限公司 | Continuous casting mold flux for boron containing steel |
| CN111230058A (en) * | 2020-03-31 | 2020-06-05 | 西峡县西保冶金材料有限公司 | Continuous casting crystallizer function protection material for air valve steel |
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