CN1300649A - Slag-stopping plate for tundish in conticasing - Google Patents

Slag-stopping plate for tundish in conticasing Download PDF

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CN1300649A
CN1300649A CN00135406A CN00135406A CN1300649A CN 1300649 A CN1300649 A CN 1300649A CN 00135406 A CN00135406 A CN 00135406A CN 00135406 A CN00135406 A CN 00135406A CN 1300649 A CN1300649 A CN 1300649A
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slag
weir plate
weight
weir
castable
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CN1167528C (en
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江泓
谭松山
王晓刚
戚新明
方丽玲
戚真健
曹志远
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YIXING REFRACTORY EQUIPMENT AND MATERIAL FACTORY
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
    • C04B35/6303—Inorganic additives
    • C04B35/6306—Binders based on phosphoric acids or phosphates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/71—Ceramic products containing macroscopic reinforcing agents
    • C04B35/74—Ceramic products containing macroscopic reinforcing agents containing shaped metallic materials
    • C04B35/76—Fibres, filaments, whiskers, platelets, or the like
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
    • C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Ceramic Products (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

A slag-stopping plate for ladle in conticasting is prepared from magnesium oxide-base refractory (92-98 Wt.%), fine SiO2 powder (2-8) and polyphosphate (0.05-1 wt.%) as disperser through moulding. Its advantages include high.high-temp resistance and durability to corrosion and flush and low pollution to molten steel.

Description

Slag-stopping weir plate for continuous casting tundish
The present invention relates to a refractory material using magnesium oxide as base material, in particular it is applicable to slag-stopping weir plate for continuous casting tundish in steelmaking.
Theoretical research and production practice of steel enterprises show that after slag containing iron oxide, manganese oxide and silicon oxide in a steel ladle flows into a tundish from the steel ladle, the slag can cause burning loss of easily oxidized alloy elements such as aluminum, titanium and the like in molten steel, and generate alumina inclusions to influence the purity of the molten steel. One of the effective methods for producing pure steel in the continuous casting process is to adopt a tundish purification technology, namely, the most extensive application is to install a calcium oxide filter and arrange a slag-stopping weir plate in a tundish. The slag-stopping weir plate for the tundish has the functions of improving the flow field of molten steel, promoting impurities in steel to float upwards, simultaneously blocking slag falling of a steel ladle in an impact area and impurities generated by refractory erosion, and improving the internal quality of the molten steel. The initial weir plate of the tundish is made of magnesium or siliceous heat insulation plate, which is organically combined by resin or inorganically combined by sulfuric acid and phosphate and is formed by mechanical pressing, the heat insulation plate has small integral volume, is a light flat plate, has poor temperature resistance and molten steel scouring resistance, and is gradually modified into a heavy, large-volume, non-mechanical pressing and complex-structure weir plate in the continuous casting production of the tundish with larger and larger capacity. The tundish weir plate widely used at present is generally a high-alumina plate, and the tundish weir plate has high temperature resistance and scouring resistance, so that the use requirement of the tundish is met, and the tundish weir plate is suitable for multi-furnace continuous casting. On the premise that the steel yield is continuously increased and the continuous casting ratio is continuously improved, the high-aluminum weir plate is limited by materials, the strength is not very high, the molten steel scouring resistance of the high-aluminum weir plate is influenced, and if a bonding agent is added to improve the strength, the temperature resistance is reduced, so that the durability of the traditional high-aluminum weir plate is limited and is generally about 5 continuous casting; another consequence of the high alumina weir plates being limited by their material is that their resistance to slag erosion cannot be further improved. Nevertheless, the high-alumina weir plate has an absolute advantage in multi-furnace continuous casting compared with the heat insulation plate with poor temperature resistance, durability and water resistance, and is widely adopted. The weir plate is set for the purpose of purifying molten steel, the traditional high-aluminium weir plate has a certain effect of removing the inclusion in the molten steel, but the oxygen content brought into the molten steel is higher, and it can not reach the ultra-pure steel level which can make five elements in the molten steel lower than 80ppm and average T0 lower than 17.5ppm, so that the high-aluminium weir plate is unfavorable for smelting pure steel and ultra-pure steel, in addition, the high-aluminium weir plate and calcium oxide filter used when smelting fine steel product can not be directly built by matching, and it has great inconvenience by means of magnesium brick liner, in the continuous casting process of smelting pure steel and ultra-pure steel, along with the alkalization of tundish refractory material, the high-aluminium weir plate will be eliminated day by day, and replaced by weir plate made of alkaline refractory material, most typically, the magnesium weir plate with perfect technology, it uses magnesium oxide as base material, magnesium cement or polyphosphate as binding agent, the chemical combination is carried out, and the reaction mechanism is as follows (taking sodium hexametaphosphate as a binding agent as an example):
Figure A0013540600031
the method is well known in the same industry that the pollution of the magnesium weir plate to the molten steel is obviously lower than that of the high-aluminum weir plate, and related data suggest that compared with the high-aluminum weir plate, the oxygen content brought into the molten steel by the magnesium weir plate can be reduced by 5 times (refer to figures 1 and 2), the slag erosion resistance is also obviously superior to that of high-aluminum, the service life of the weir plate is prolonged, the refractory consumption is reduced, aluminum oxide in the molten steel can be absorbed, the inclusion is further reduced, and meanwhile, the problem of inconvenience brought to the site due to the fact that a magnesium brick filter layer needs to be built when a calcium oxide filter is installed on the high-aluminum weir plate is solved. However, the chemically bonded magnesium weir plate has disadvantages in practical use, and referring to FIG. 3, MgO-P2O5The system formed is devoid of high melting compounds and sodium is taken in by the binder to form NaMgPO4The melting point of the compound is only 1260 ℃, the temperature resistance requirement of the tundish cannot be met (the temperature of the tundish is 1500 ℃), and a small amount of calcium can be added into the compoundSalts such as calcium aluminate cement, calcium carbonate, etc., by adjusting the CaO/P of the matrix2O5In order to obtain the look like Na2CaMg(PO4)2、NaCaPO4And Na2O·CaO·Ca3(PO4)2·SiO2Such as a high melting point binder phase, suitable for use in a continuous casting tundish. Although the temperature resistance can be improved to a certain extent, the chemical bonding magnesium weir plate can not solve the hydration resistance problem, even if a layer of hydration-resistant coating is coated on the surface of the weir plate, the effect is still not ideal in the using process, the surface treatment process is complex, the chemical bonding magnesium weir plate is not as good as a high-aluminum weir plate in the durability, and the continuous casting ratio is low, so the weir plate is not suitable for continuous casting tundishes, is particularly not suitable for being applied to occasions with higher use requirements such as an electric furnace steelmaking plasma heating tundish and the like, and is also the reason that the high-aluminum weir plate is still widely adopted in the continuous casting tundishes nowadays.
The invention aims to overcome the defects and provides the slag-stopping weir plate for the continuous casting tundish, which has high temperature resistance, strong durability, excellent hydration resistance, low oxygen content brought into molten steel, easy storage, transportation and installation and is suitable for smelting pure steel.
The invention has the innovation points that the basic refractory product, namely the magnesia refractory material is selected as the main material,the silicon dioxide micropowder is used as the bonding agent, and the condensation bonding (namely the ultrafine powder bonding) of the magnesia refractory material is realized, so that the problems of low temperature resistance, low durability, easy hydration and the like of the chemically bonded magnesia weir plate are solved, and the magnesia weir plate which has the high-temperature resistance for bearing the use of a steel-making tundish, is superior to a high-aluminum weir plate in durability and has no hydration problem is obtained. The slag-stopping weir plate for continuous casting tundish is made up by using magnesium oxide as base material and adopting the processes of casting and forming, and is characterized by that its main material is formed from 92-98 wt% of magnesium refractory material and 2-8 wt% of silicon dioxide micropowder, and its added dispersing agent polymerized phosphate whose content is 0.05-1% of weight of main material of casting material. The magnesia refractory material is sintered magnesite, fused magnesite or other magnesite with MgO content over 94%, and has critical grain size controlled within 7mm, including grains greater than 1mm accounting for 55-65% and grains smaller than 0.074mm accounting for 25-30%; SiO of fine silica powder2The content is required to be above 88%, and the medium-diameter particle size (namely 50% of particle material size) is not more than 1.5 μm, too muchThe high-temperature performance of the weir plate can be influenced by more micro powder, and the strength of the weir plate is reduced by less micro powder, so that the adding amount of the silicon dioxide micro powder is controlled to be 2-8%, preferably 3-5%; the polymeric phosphate used as the dispersant may be selected from sodium tripolyphosphate, sodium hexametaphosphate, etc. of industrial grade or more, and in order to achieve a better dispersing effect, the polymeric phosphate is preferably added in an amount of 0.1 to 0.5% by weight based on the weight of the castable main material. Referring to FIG. 4, the matrix phase bound with the fine silica powder itself ensures CaO/SiO2More than 2, thus obtaining the serpentine 3 MgO.2SiO with high low-temperature strength2·2H2O and high temperature bonding phase forsterite 2 MgO. SiO2The reaction mechanism is as follows:the proportion of the fine silica powder as a binder to the magnesia refractory material determines the CaO/SiO content of the matrix2Less than 1, the matrix composition falls within the range of MgO-2 MgO. SiO2-CaO·MgO·SiO2The solidification temperature of the corresponding invariant point in the formed triangular part is 1502 ℃, which is suitable for the service temperature of the tundish, although the refractory property is inferior to CaO/SiO2The combined phase is more than 2, but the forsterite phase is superior to calcium silicate minerals in terms of volume stability and ferrite corrosion resistance, and a combination with better comprehensive performance can be obtained. The durability of the magnesium weir plate combined by adopting the superfine powder is greatly improved compared with that of the chemical combination, and industrial tests show that the service life of the magnesium weir plate is more than 6 continuous casting and better than that of the high-aluminum weir plate, and more than 30 percent of the magnesium weir plate combined by the superfine powder can also reach 10 continuous casting; in addition, the ultra-fine powder hydration and the free MgO generate stable crystals, and the problem of easy hydration of the chemically combined magnesium weir plate is solved.
In order to improve the volume stability of the magnesium weir plate, the castable is added with an expansion material, the content of the expansion material is 0-5% of the weight of the main material of the castable, the preferred addition amount is 1-4%, the commonly used expansion material can be kyanite, andalusite, sillimanite, quartz sand and the like, and the best effect is quartz sand.
In order to adapt to the use environment of the tundish, particularly to bear thermal shock from sudden rise of baking temperature to molten steel temperature during casting and improve the defect of poor inherent thermal shock property of the magnesium refractory, steel fibers are added into the castable to play a role in resisting explosion and toughening a weir plate and prevent the weir plate from cracking during baking, particularly when a large-volume weir plate is cast, the steel fibers are particularly required to be used, and the adding amount of the steel fibers is 0-3 percent of the weight of the main material of the castable, and is preferably 1-3 percent.
In order to make the material have good preparation performance, the casting material can be added with a coagulation regulator to realize coagulation acceleration or coagulation retardation, the addition amount of the coagulation regulator is 0-0.3% of the weight of the main material of the casting material, and Li can be selected according to the actual condition during preparation2CO3、Ca(OH)2Accelerators such as LiOH, retarders such as boric acid and tartaric acid.
The addition of a small amount of the explosion-proof agent into the castable can improve the air permeability of the weir plate and solve the cracking problem during baking, the addition of the explosion-proof agent is usually 0-0.5% of the weight of the main material of the castable, and the optional explosion-proof agent is metal aluminum, an AC foaming agent, silica sol, organic fiber and the like.
FIG. 1 is a diagram showing a slag equilibrium of molten steel at 1500 ℃.
FIG. 2 is a graph showing the change of the molten steel flow rate O2FIG. 2 (a).
FIG. 3 shows MgO-P2O5And (4) a system phase diagram.
FIG. 4 shows CaO-MgO-SiO2And (4) a system phase diagram.
The present invention is further illustrated by the following examples.
Example 1, 97 parts of magnesium raw material, 3 parts of silica micropowder, 0.2 part of sodium tripolyphosphate, 2 parts of quartz sand and 0.4 part of composite anti-aeration agent are taken, the castable is dry-mixed for 3 minutes and wet-mixed for 3 minutes in a stirrer, is vibrated and cast into test blocks with the sizes of 40 multiplied by 160mm and 50 multiplied by 50mm, is dried at the temperature of 110 ℃, and is subjected to heat treatment at the temperature of 600 ℃ multiplied by 3 hours, 1200 ℃ multiplied by 3 hours and 1500 ℃ multiplied by 3 hours to test the physical and chemical properties, and simultaneously is compared with the physical and chemical properties of a magnesium weir plate combined (chemically combined) with sodium hexametaphosphate with similar components, and the detailed table I is provided.
Magnesium weir with two combination formsProperties of the Panel
Binding of sodium hexametaphosphate Bonding of silica micropowder
110℃×24h Bulk Density (g/cm)3) Breaking strength (Mpa) Compressive strength (Mpa) 2.78 8.3 74.5 2.84 ＞10.5 109.4
600℃×3h Bulk Density (g/cm)3) Line change rate (%) Breaking strength (Mpa) Compressive strength (Mpa) 2.76 -1.13 6.9 64.8 2.82 -0.03 7.1 65.2
1200℃×3h Bulk Density (g/cm)3) Line change rate (%) Breaking strength (Mpa) Compressive strength (Mpa) 2.76 -0.19 5.4 39 2.80 +0.05 3.7 37.4
1500℃×3h Bulk Density (g/cm)3) Line change rate (%) Breaking strength (Mpa) Compressive strength (Mpa) 2.79 -0.35 6.2 42.8 2.80 +0.06 8.5 66.8
Refractoriness under load (4% deformation) DEG C 1450 1520
Amount of added water (%) 6.7 5.3
As can be seen from the table I, the strength of the magnesium weir plate combined with the silicon dioxide micropowder after heat treatment at different temperatures is higher than that of the magnesium weir plate combined with sodium hexametaphosphate or equivalent to that of the magnesium weir plate combined with the sodium hexametaphosphate, and the refractoriness under load is higher than 70 ℃, so that the magnesium weir plate combined with the silicon dioxide micropowder has better mechanical scouring resistance and high-temperature performance.
The hydration resistance test of the magnesium weir plate combined with the silicon dioxide micropowder is carried out, and the experimental result is shown in tables 2 and 3.
TABLE 2 numbering description
1# Drying test block at 110 ℃ for 24h
2# Drying the test block at 110 deg.C for 24 hr, storing in room for 7 days, and collecting the dried test block at 110 deg.CDrying for 24h
3# Drying the test block at 110 ℃ for 24h, storing the test block indoors for 28 days, and drying the test block at 110 ℃ for 24h
4# Drying the test block at 110 ℃ for 24h, storing the test block indoors for 250 days, and drying the test block at 110 ℃ for 24h
5# Drying the test block at 110 ℃ for 24h, soaking the test block in cold water for 7 days, and drying the test block at 110 ℃ for 24h
Wire transformer Chemical conversion rate Based on the first drying at 110 ℃ for 24h
TABLE 3 hydration resistance test
1# 2# 3# 4# 5#
Breaking strength (Mpa) ＞10.5 ＞10.5 ＞10.5 ＞10.5 ＞10.5
Compressive strength (Mpa) 104.1 106.5 107.4 102.6 126.9
Line change rate (%) ±0 ±0 ±0 ±0
As can be seen from tables 2 and 3, the test blocks stored for a long time and soaked in water have unchanged shape and size, and particularly, the strength after soaking is improved, so that the test blocks have good hydration resistance and are convenient to store and transport.
Example 2, 95 parts of magnesium material, 5 parts of fine silica powder, 0.3 part of sodium hexametaphosphate, 3 parts of quartz sand, 1.5 parts of steel fiber, and 0.2 part of Li2CO3And 0.3 part of the composite anti-aeration agent, and performing industrial test on the prepared weir plate in a Bao steel 60T tundish, wherein the test result and the comparison data of the high-alumina weir plate are shown in Table 4.
TABLE 4 comparison of Industrial tests on two Weir plates
High-aluminum weir plate Magnesium weir plate
Chemical composition Al2O3％ 70.57
MgO％ 90.42
Fe2O3％ 0.63
Bulk density g/cm3 110℃，24h 2.5 2.85
1500℃，24h 2.83
Compressive strength MPa 110℃，24h 38.5 118.7
1500℃，24h 65.0
The linear change rate is 1500 ℃, 3 h% +0.15
Effect of purifying molten steel The pollution to molten steel is great Oxygen content brought into molten steel Mass ratio high aluminum weir plate 5 times lower
Durability Can be continuously cast by 5 The method can be used for continuously casting more than 6, more than 30% of the total amount can be used by 10 Continuous casting
As can be seen from Table 4, the magnesium weir plate combined by the silicon dioxide micropowder has incomparable advancement compared with the high-aluminum weir plate in both physical and chemical properties, molten steel purification effect and service performance; particularly, a triple weir test is additionally arranged on the basis of a double weir according to the requirements of Bao steel, and compared with magnesium and high-aluminum materials, the result shows that a high-aluminum weir plate with the same thickness is broken and floats upwards in use, while the magnesium weir plate not only shows convenience in assembling a calcium oxide filter, but also shows little melting loss at a slag line part after being used, and can be suitable for multi-furnace continuous casting, and the magnesium weir plate is matched with an alkaline refractory material for use, so that the ultra-pure steel with 5 major elements below 80PPm is successfully smelted.
The slag-stopping weir plate for the continuous casting tundish, which takes magnesium oxide as a base material and silicon dioxide micropowder as a binding agent for casting molding, can bear the high temperature used by the tundish, has strong durability, especially can embody the durability of erosion resistance and scouring resistance when used as a triple weir, and the magnesium weir plate combined by the micropowder solves the hydration problem of magnesium refractory.

Claims (10)

1. The slag-stopping weir plate for continuous casting tundish is made up by using magnesium oxide as base material and adopting the processes of casting and forming, and is characterized by that its main material is formed from 92-98 wt% of magnesium refractory material and 2-8 wt% of silicon dioxide micropowder, and its added dispersing agent polymerized phosphate whose content is 0.05-1% of weight of main material of casting material.
2. The slag weir of claim 1, wherein the magnesia refractory has an MgO content of 94% or more and a critical particle size of 7mm, wherein particles larger than 1mm comprise 55-65% and particles smaller than 0.074mm comprise 25-30%.
3. The slag weir of claim 2 wherein the SiO of the fine silica powder2The content is more than or equal to 88 percent, and the medium diameter granularity is less than or equal to 1.5 mu m.
4. The slag weir of claim 1, wherein the preferred amount of fine silica powder is 3 to 5%.
5. The slag-stopping weir plate according to claim 1, wherein the dispersant polyphosphate is added in an amount of 0.1-0.5% by weight of the castable main material.
6. A slag weir according to any one of claims 1, 4 and 5, wherein the castable material includes an intumescent material in an amount of 0 to 5% by weight of the castable material, preferably 1 to 4% by weight.
7. The slag weir of claim 6 wherein the intumescent material is quartz sand.
8. A weir plate according to claim 1 or 7, wherein the castable material is loaded with steel fibres in an amount of 0-3% by weight of the main castable material, preferably 1-3% by weight.
9. The slag-stopping weir plate according to claim 1 or 8, wherein a pour control agent is added to the pouring material, and the content of the pour control agent is 0-0.3% of the weight of the main material of the pouring material.
10. The slag-stopping weir plate according to claim 1 or 9, wherein a small amount of an explosion-proof agent is added to the castable, and the content of the explosion-proof agent is 0-0.5% of the weight of the castable main material.
CNB00135406XA 2000-12-13 2000-12-13 Slag-stopping plate for tundish in conticasing Expired - Fee Related CN1167528C (en)

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CN1317237C (en) * 2005-10-27 2007-05-23 武汉钢铁(集团)公司 Refractory castable in use for homogeneous stopper plug of floating plug, and preparation method
CN101798235A (en) * 2010-03-30 2010-08-11 唐庆华 Methods of preparing and using wet vibration material
CN101869970A (en) * 2010-05-31 2010-10-27 莱芜钢铁集团有限公司 Continuous casting tundish slag blocking wall of composite material and production technology
CN102584305A (en) * 2012-03-19 2012-07-18 苏州宝蠡耐火材料有限公司 Floating plug
CN102659430A (en) * 2012-04-23 2012-09-12 洛阳市科创耐火材料有限公司 Silica sol combined magnesium tundish prefabricated member and manufacturing method thereof
CN103302259A (en) * 2013-07-01 2013-09-18 莱芜钢铁集团有限公司 Continuous-casting tundish slag stopping dam and manufacturing method thereof
CN106588055A (en) * 2016-12-20 2017-04-26 郑州安联凯实业有限公司 Heat-conduction anti-abrasion fireproof material
CN109987951A (en) * 2019-04-24 2019-07-09 郑州市瑞沃耐火材料有限公司 The production method of clean steel smelting slag blocking dart
CN117226084A (en) * 2023-09-12 2023-12-15 中钢集团洛阳耐火材料研究院有限公司 Method for reducing alumina inclusion in tundish molten steel

Cited By (11)

* Cited by examiner, † Cited by third party
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CN1317237C (en) * 2005-10-27 2007-05-23 武汉钢铁(集团)公司 Refractory castable in use for homogeneous stopper plug of floating plug, and preparation method
CN101798235A (en) * 2010-03-30 2010-08-11 唐庆华 Methods of preparing and using wet vibration material
CN101798235B (en) * 2010-03-30 2012-07-18 唐庆华 Methods of preparing and using wet vibration material
CN101869970A (en) * 2010-05-31 2010-10-27 莱芜钢铁集团有限公司 Continuous casting tundish slag blocking wall of composite material and production technology
CN102584305A (en) * 2012-03-19 2012-07-18 苏州宝蠡耐火材料有限公司 Floating plug
CN102659430A (en) * 2012-04-23 2012-09-12 洛阳市科创耐火材料有限公司 Silica sol combined magnesium tundish prefabricated member and manufacturing method thereof
CN103302259A (en) * 2013-07-01 2013-09-18 莱芜钢铁集团有限公司 Continuous-casting tundish slag stopping dam and manufacturing method thereof
CN106588055A (en) * 2016-12-20 2017-04-26 郑州安联凯实业有限公司 Heat-conduction anti-abrasion fireproof material
CN109987951A (en) * 2019-04-24 2019-07-09 郑州市瑞沃耐火材料有限公司 The production method of clean steel smelting slag blocking dart
CN117226084A (en) * 2023-09-12 2023-12-15 中钢集团洛阳耐火材料研究院有限公司 Method for reducing alumina inclusion in tundish molten steel
CN117226084B (en) * 2023-09-12 2024-05-07 中钢集团洛阳耐火材料研究院有限公司 Method for reducing alumina inclusion in tundish molten steel

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