A ladle tank rim casting material and use method thereof

Abstract

The invention discloses a ladle tank edge castable, which includes the following components by weight: 4-8 parts of CA-60 cement; 4-12 parts of CA-75 cement; 10-20 parts of clay waste; 25-30 parts of high-aluminum skateboard polishing recycled powder; 5-10 parts of waste ladle high-aluminum low-silicon steel pipe crushing material; 10-25 parts of waste brick slag tailings; 2-4 parts of kyanite; 5-6 parts of alumina micropowder; 8-9 parts of silicon micropowder; 0.2-0.3 parts of deflocculating agent; 0.5-2 parts of reinforcing agent. The invention also provides a method for using a ladle tank edge castable. The invention has the characteristics of high strength, low cost, good safety performance and environmental protection, good anti-stripping and anti-corrosion, stable quality, and not easy to pulverize, which improves the service life of the ladle tank, reduces the labor intensity of workers, reduces material consumption and industrial waste treatment costs, and effectively improves the recycling rate of recycled material tailings in steel mills and refractory material plants and the work efficiency of workers.

Description

Technical Field

[0001] The invention relates to the technical field of refractory casting materials, in particular to a ladle rim casting material and a use method thereof. Background Art

[0002] The main function of the amorphous refractory material used in the ladle tank is to compress the refractory bricks of the lower ladle slag line to prevent the refractory bricks of the ladle slag line from loosening and falling off. During use, the ladle tank edge generally does not contact the molten steel (slag), but sometimes due to fluctuations in the amount of steel tapped, the molten steel directly contacts the tank edge when the amount of steel tapped is large. Therefore, the refractory material in this part is required to have good medium and high temperature strength, and have certain anti-stripping and anti-erosion capabilities. At present, the ladle tank edge castables actually used in production at home and abroad generally have the disadvantages of high cost and short life.

[0003] The recycling of waste materials is an important direction for the selection of raw materials for ladle tank castings. The high-aluminum skateboard polishing recycled powder is mainly the grinding waste generated by the skateboard workshop during the grinding and polishing process on the milling machine. The high-aluminum low-silicon steel pipe of the scrap ladle is a kind of waste material replaced during the steel smelting process due to wear, damage or other reasons during use. The waste brick slag tailings mainly come from the waste slag line bricks and wall tiles generated after the daily minor and major repairs of the molten steel tank. The high-aluminum skateboard polishing recycled powder, waste brick slag tailings, etc. generated by the existing refractory material factory are all treated as industrial waste, which causes waste of resources and environmental pollution, and also increases the cost of garbage disposal for enterprises.

[0004] At present, aluminum carbon tank edge materials are often used in the lap of steel ladles and iron ladles for smelting molten steel, and are used to seal and fix the refractory lining of the ladle, which is easily affected by molten steel and slag erosion. For a long time, 88 special high-alumina bauxite, coke gemstone, etc. have been mainly used for production. However, these materials have poor self-flowing properties, resistance to slag erosion, and anti-flaking properties, and low strength, instability, and easy powdering, resulting in a short service life and high cost of this type of aluminum carbon lap edge material. CN112341222A discloses "a molten iron ladle castable and its preparation method", in which CA-50 cement and CA-70 cement are compounded to make a molten iron ladle castable with low apparent porosity and high strength. However, the molten iron ladle castable cannot meet the performance requirements for use in the ladle rim, and the method disclosed in CN112341222A is not suitable for ladle rim castables.

[0005] In summary, how to achieve the effective recycling of high-aluminum skateboard polishing regeneration powder, waste brick slag tailings, etc. and how to find a higher performance ladle tank rim casting material are technical problems that technical personnel in this field need to solve urgently. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a ladle tank rim castable and a use method thereof, which has the characteristics of high strength, low cost, good safety performance and environmental protection, good anti-stripping and corrosion resistance, stable quality and not easy to pulverize, thereby improving the service life of the ladle tank, reducing the labor intensity of workers, reducing material consumption and industrial waste treatment costs, and effectively improving the recycling rate of recycled material tailings in steel mills and refractory material plants and the work efficiency of workers.

[0007] The technical solution provided by the present invention is as follows:

[0008] A ladle rim castable comprises the following components in parts by weight:

[0009] 4-8 parts of CA-60 cement;

[0010] 4-12 parts of CA-75 cement;

[0011] 10-20 parts of clay waste;

[0012] 25-30 parts of high aluminum skateboard polishing regeneration powder;

[0013] 5-10 portions of crushed high-aluminum and low-silicon steel pipes from scrap steel ladle;

[0014] 10-25 parts of waste brick slag tailings;

[0015] 2 to 4 parts of kyanite;

[0016] 5-6 parts of alumina powder;

[0017] Silica powder 8-9 parts;

[0018] 0.2-0.3 parts of deflocculant;

[0019] Enhancer 0.5 to 2 parts.

[0020] CA-60 cement usually has a higher alumina content, which means that its performance in refractory castables may be better, especially in terms of high temperature and wear resistance. CA-60 aluminate cement refractory castables have the characteristics of rapid hardening and high strength. Generally, the maximum use temperature of CA-60 cement refractory castables is 1500℃. Compared with CA-50 cement, CA-60 cement refractory castables have more stable performance at high temperatures, better erosion resistance and wear resistance, and are suitable for more demanding high temperature environments. After standard curing, the compressive strength is about 30MPa in 1 day, 42MPa in 3 days, and 50MPa in 7 days, which is higher than that of CA-50 cement refractory castables. This is because the hydration heat released by cement containing more calcium promotes the rapid hydration reaction of calcium. CA-60 cement refractory castables, like CA-50 cement refractory castables, also have the problem of low strength at medium temperature. After 1200℃, sintering occurs due to the increase in the amount of liquid phase, and the castable forms a ceramic binder, so the strength increases with the increase in heating temperature. The linear change and linear expansion coefficient of CA-60 cement refractory castable after combustion are more stable than those of CA-50 cement refractory castable, and the refractory performance under load and refractory is higher.

[0021] CA-75 cement is a hydraulic binder with an alumina content of about 75%. It has a higher alumina content than CA-70 cement. In particular, the reasonable combination of CA phase (monocalcium aluminate) and CA2 phase (dicalcium aluminate) makes this series of products not only give amorphous refractory materials high mechanical properties, but also make them have excellent high-temperature performance. Its performance in refractory castables is better than that of CA-70 cement, especially in terms of high temperature and wear resistance. It is characterized by high medium and high temperature strength, the highest use temperature (refractory) is 1750℃-2000℃ (the refractoriness of CA-70 cement is generally 1580-1620℃), the refractory castable prepared with it has a high refractoriness under load, high temperature strength, and good resistance to slag erosion; at the same time, due to its high purity and low impurity content, it has a strong ability to resist erosion by reducing media such as CO, H2, and CH4. After standard curing, the compressive strength is about 60MPa in 1 day, 80MPa in 3 days and 100MPa in 7 days, which is higher than the performance of CA-70 cement refractory castable. (After standard curing, the compressive strength of CA-70 cement is 45-50MPa in 1 day, 55-60 MPa in 3 days and 80-90 MPa in 7 days) This helps to achieve faster construction and earlier commissioning in refractory castables. Although CA-70 cement is suitable for a variety of refractory castables, CA-75 cement is more suitable for high-performance and high-demand applications due to its higher purity and performance.

[0022] The castable used for the ladle tank of the present invention adopts a combination of CA-60 cement and CA-75 cement, and its performance is significantly better than the existing combination of CA-50 cement and CA-70 cement. Although the existing castable for hot metal ladle uses CA-50 cement and CA-70 cement for bonding to improve strength and reduce the cost of cement, after comparing the improvement of the formula by using CA-60 cement and CA-75 cement in the castable for the ladle tank edge, the overall physical properties have been further improved and are more cost-effective. It not only effectively reduces the total amount of cement added and the amount of water added, increases the bulk density of the castable and reduces the apparent porosity, improves the mechanical properties of the material, has the characteristic of high strength, reduces the spalling period and slag resistance of the ladle tank edge, improves the thermal shock resistance and service life of the ladle tank, reduces the manual labor intensity. In addition, it also reduces the total amount of cement used, reduces material consumption, and greatly reduces the cost of the castable.

[0023] Preferably, the CA-60 cement comprises the following components by weight percentage:

[0024] 0 < SiO2 ≤ 0.3%, 60% ≤ Al2O3 < 68%, 0 < alkali metal oxides ≤ 0.50%, 0 < S ≤ 0.20% and 0 < Cl ≤ 0.1%, and the alkali metal oxides are at least one of K2O and Na2O.

[0025] Preferably, the CA-75 cement comprises the following components by weight percentage:

[0026] 0 < SiO2 ≤ 0.3%, 73% ≤ Al2O3 < 75%, 0 < Fe2O3 ≤ 0.3%, 0 < alkali metal oxides ≤ 0.50%, 0 < S ≤ 0.20% and 0 < Cl ≤ 0.1%, and the alkali metal oxides are at least one of K2O and Na2O.

[0027] Preferably, the high-alumina slide plate polishing recycled powder comprises the following components by weight percentage:

[0028] Al2O3 ≥ 75%, Fe2O3 ≤ 1%, C ≥ 5%, MgO ≤ 1.05%, H2O ≤ 1.0%.

[0029] Preferably, the crushed material of waste ladle high-alumina low-silicon through steel pipe comprises the following components by weight percentage:

[0030] SiO2 ≥ 9.0%, Al2O3 ≥ 75%, Fe2O3 ≤ 0.2%, C ≥ 10%, H2O ≤ 1.0%.

[0031] Preferably, the reinforcing agent is Q195 bow-shaped steel fiber, and the particle size of the steel fiber is 0.2 - 20 mm.

[0032] Preferably, the particle size of the clay waste is 0-5 mm, the particle size of the waste brick slag tailings is 0.088-10 mm; the particle size of the kyanite is 0.2-1 mm; the particle size of the alumina micropowder is 2-5 um; the particle size of the silicon micropowder is 0.15-5 um; the deflocculant is sodium tripolyphosphate, and the particle size of the deflocculant is not greater than 0.088 mm.

[0033] A method for using the ladle tank rim castable as described above comprises the following steps:

[0034] S1, dry-mixing the components of the ladle tank castable to form a dry mixture, and then adding water to the dry mixture for wet mixing to form a mixture to make the ladle tank castable;

[0035] S2. Lay a layer of high-alumina bricks in the ladle tank as a permanent layer. After the permanent layer bricks are laid, lay the aluminum-magnesium-carbon tank edge bricks, and weld the pressed iron blocks around the tank edge bricks;

[0036] S3, fill the ladle tank along the castable material obtained in S1 into the gap of the tank edge bricks, then fill and smooth the tank edge material, and after forming, naturally cure in the air for a period of time;

[0037] S4. After the curing is completed, baking treatment is carried out to obtain the finished product of the ladle tank rim castable.

[0038] Preferably, the amount of water added to the dry mix in step S1 is 8-12% of the total mass of the dry mix.

[0039] Preferably, in step S3, after the ladle tank is filled with the castable material into the gaps of the tank edge bricks, a vibrating rod is used to vibrate uniformly around the tank edge bricks.

[0040] The present invention has the following advantages over the prior art:

[0041] 1. The present invention prepares a new ladle rim casting material by compounding CA-60 cement and CA-75 cement, adding self-produced high-quality high-aluminum skateboard polishing recycled powder, waste ladle high-aluminum low-silicon steel pipe recycled material, waste brick slag tailings and clay waste bricks. Under the condition of ensuring the construction performance and green strength of the casting material, the amount of cement added and the amount of water added can be effectively reduced, the volume density of the casting material can be increased and the apparent porosity can be reduced. The casting material has the characteristics of high strength, low cost, good safety performance, good spalling resistance, good corrosion resistance, stable quality and not easy to pulverize. The carbon content in the material is beneficial to the slag erosion resistance of the ladle rim casting material, and the high strength is conducive to cleaning the slag accumulated on the ladle rim without causing the ladle rim casting material to hang off, thereby prolonging the service life of the ladle rim, reducing the labor intensity of workers, and reducing the material consumption and industrial waste treatment costs.

[0042] 2. The present invention adopts two kinds of waste materials, namely, high-aluminum skateboard polishing regeneration powder and scrap steel ladle high-aluminum low-silicon steel pipe regeneration material, which has the following advantages: the raw materials of high-aluminum skateboard polishing regeneration powder and scrap steel ladle high-aluminum low-silicon steel pipe regeneration material are mainly imported Anmai plate-shaped corundum particles and fine powder. The advantage of plate-shaped corundum particles as refractory raw materials is that the density is relatively low, and there are tiny intracrystalline pores (closed pores 1-10μm). These crystalline pores can not be penetrated by slag and can greatly improve the thermal shock resistance of aggregate. Compared with ordinary fused white corundum, it has very good spalling resistance and particle strength. At the same time, after high-temperature (1650℃-1800℃) heat treatment, the castable containing plate-shaped corundum has much higher thermal shock resistance and flexural strength than ordinary fused corundum castables; at the same time, the ladle tank along the castable is polished by the heightened aluminum slide plate and the high-aluminum and low-silicon steel pipe recycled material of the waste ladle can not only fill the gap and significantly reduce the porosity of the castable, but also improve the room temperature, medium and high temperature compressive strength and flexural strength and enhance the slag resistance. DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0044] An embodiment of the present invention provides a ladle rim castable, which comprises the following components in parts by weight:

[0045] 4-8 parts of CA-60 cement;

[0046] 4-12 parts of CA-75 cement;

[0047] 10-20 parts of clay waste;

[0048] 25-30 parts of high aluminum skateboard polishing regeneration powder;

[0049] 5-10 portions of crushed high-aluminum and low-silicon steel pipes from scrap steel ladle;

[0050] 10-25 parts of waste brick slag tailings;

[0051] 2 to 4 parts of kyanite;

[0052] 5-6 parts of alumina powder;

[0053] Silica powder 8-9 parts;

[0054] 0.2-0.3 parts of deflocculant;

[0055] 0.5 to 2 parts of enhancer.

[0056] In this embodiment, the ladle tank edge castable is made by compounding CA-60 cement and CA-75 cement, adding self-produced high-quality high-aluminum slide plate polished recycled powder, crushed material of waste ladle high-aluminum low-silicon through-pipe, waste brick slag tailings and clay waste bricks to form a new ladle tank edge castable. Under the condition of ensuring the construction performance and green strength of the castable, the cement addition amount and water addition amount can be effectively reduced, the bulk density of the castable can be increased and the apparent porosity can be reduced. It has the characteristics of high strength, low cost, good safety performance, good spalling resistance, good erosion resistance, stable quality and not easy to powder. Since the material contains carbon, it is beneficial to the slag erosion resistance of the ladle edge castable, and the high strength is beneficial to cleaning the slag accumulation on the ladle edge without scraping off the ladle edge castable, improving the service life of the ladle tank, reducing the labor intensity of workers and reducing the material consumption.

[0057] In this embodiment, the CA-60 cement includes the following components by weight percentage:

[0058] 0 < SiO2 ≤ 0.3%, 60% ≤ Al2O3 < 68%, 0 < Fe2O3 ≤ 3.0%, 0 < alkali metal oxides ≤ 0.50%, 0 < S ≤ 0.20% and 0 < Cl ≤ 0.1%, and the alkali metal oxides are at least one of K2O and Na2O.

[0059] In this embodiment, the CA-75 cement includes the following components by weight percentage:

[0060] 0 < SiO2 ≤ 0.3%, 73% ≤ Al2O3 < 75%, 0 < Fe2O3 ≤ 0.3%, 0 < alkali metal oxides ≤ 0.50%, 0 < S ≤ 0.20% and 0 < Cl ≤ 0.1%, and the alkali metal oxides are at least one of K2O and Na2O.

[0061] In this embodiment, the high-aluminum slide plate polished recycled powder includes the following components by weight percentage:

[0062] Al2O3 ≥ 75%, Fe2O3 ≤ 1%, C ≥ 5%, MgO ≤ 1.05%, H2O ≤ 1.0%.

[0063] In this embodiment, the crushed material of waste ladle high-aluminum low-silicon through-pipe includes the following components by weight percentage:

[0064] SiO2 ≥ 9.0%, Al2O3 ≥ 75%, Fe2O3 ≤ 0.2%, C ≥ 10%, H2O ≤ 1.0%.

[0065] In this embodiment, the reinforcing agent is steel fiber, specifically Q195 bow fiber, the particle size of the steel fiber is 0.2-20 mm, and the steel fiber is a chemical fiber with a length of 40-80 supported by cutting fine steel wire, cold rolling and milling, or rapid condensation of molten steel, which can basically maintain its original physical and mechanical properties after being subjected to high temperature for a long time. Adding steel fiber can improve the compressive strength, mechanical strength, impact strength, impact toughness and other properties of the castable along the ladle tank.

[0066] In this embodiment, the particle size of the clay waste is 0-5mm, the particle size of the waste brick slag tailing is 0.088-10mm; the particle size of kyanite is 0.2-1mm, kyanite is a new type of refractory material, a high-aluminum mineral, with strong chemical corrosion resistance, high thermal shock mechanical strength, and irreversible thermal expansion. In this embodiment, the addition of kyanite can prevent the shrinkage cracks and peeling problems along the castable of the ladle tank during high temperature and cooling; the particle size of the alumina powder is 2-5um, and the alumina powder is a customized special-grade alumina powder, and the main crystal of the customized special-grade alumina is The phase is α-Al2O3, and there is no phase change reaction accompanied by volume shrinkage in the entire temperature change range. Therefore, the castable along the ladle tank fired with customized special-grade alumina micropowder has a small apparent porosity, which can form a dense organizational structure along the castable along the ladle tank and obtain good strength and wear resistance; the particle size of the silicon micropowder is 0.15-5um; the deflocculant is sodium tripolyphosphate, and the particle size of the deflocculant is not more than 0.088mm. The deflocculant is added to enable the fine powder and micropowder to be well dispersed when the castable is formed during the pouring process, so that the castable along the ladle tank has better fluidity.

[0067] A method for using the above-mentioned ladle tank rim castable comprises the following steps:

[0068] S1. Dry-mix the components of the ladle tank castable material to form a dry mix, then add water to the dry mix for wet mixing, wherein the amount of water added to the dry mix is ​​8-12% of the total mass of the dry mix, to form a mixture to prepare the ladle tank castable material;

[0069] S2. Lay a layer of high-alumina bricks in the ladle tank as a permanent layer. After the permanent layer bricks are laid, lay the aluminum-magnesium-carbon tank edge bricks, and weld the pressed iron blocks around the tank edge bricks;

[0070] S3, fill the ladle tank along the castable material obtained in S1 into the gap of the tank edge bricks, use a vibrating rod to vibrate evenly around the tank edge bricks, then fill and smooth the tank edge material, and after forming, naturally cure in the air for a period of time;

[0071] S4. After the curing is completed, baking treatment is carried out to obtain the finished product of the ladle tank rim castable.

[0072] The ladle tank rim castable and its use method of this embodiment have low production and manufacturing costs, and the finished product of the ladle tank rim castable has the characteristics of high strength, low cost, good safety performance, environmental protection, good anti-stripping and erosion resistance, stable quality, and not easy to pulverize, because a large part of the main materials used are recycled waste (high-aluminum skateboard polishing recycled powder, waste ladle high-aluminum low-silicon steel pipe crushing materials, waste brick slag tailings). It has the characteristics of high strength, low cost, good safety performance, environmental protection, good anti-stripping and erosion resistance, stable quality, and not easy to pulverize, which improves the service life of the ladle tank, reduces the labor intensity of workers, reduces material consumption and industrial waste treatment costs, and effectively improves the recycling rate of recycled material tailings in steel mills and refractory material plants and the work efficiency of workers. Traditional aluminum carbon tank rim materials have long been mainly produced using 88 special high-aluminum bauxite, coke gemstones, etc., but these materials have poor self-flowing properties, resistance to slag erosion, and anti-stripping properties, and low strength, instability, and easy to be powdery, resulting in a short service life and high cost for this type of aluminum carbon ladle rim material. In addition, the high-aluminum skateboard polishing regeneration powder, scrap ladle high-aluminum low-silicon steel pipe crushing materials, and waste brick slag tailings from traditional refractory material factories are all treated as industrial waste on a daily basis, which not only causes waste of resources and environmental pollution, but also increases the cost of waste treatment for enterprises. Therefore, the ladle tank rim casting material and the use method of the present embodiment are obviously superior to existing products.

[0073] The present invention is described below in conjunction with specific embodiments.

[0074] Embodiment 1:

[0075] A ladle rim castable comprises the following components in parts by weight:

[0076] 6 parts of CA-60 cement;

[0077] 4 parts of CA-75 cement;

[0078] Clay waste 20 parts;

[0079] 25 parts of high aluminum skateboard polishing regeneration powder;

[0080] 10 parts of high-aluminum and low-silicon steel pipe crushed materials from scrap steel ladle;

[0081] 15 parts of waste brick slag tailings;

[0082] 4 parts of kyanite;

[0083] 6 parts of alumina powder;

[0084] Silica powder 8 parts;

[0085] 0.2 parts of deflocculant;

[0086] 2 parts of enhancer.

[0087] A method for using the above-mentioned ladle tank rim castable comprises the following steps:

[0088] S1. Dry mix the components of the castable in the ladle tank for 2-3 minutes in strong stirring, add water and wet mix for ≥5 minutes, with the amount of water added being 10%;

[0089] S2. Lay a layer of high-alumina bricks in the ladle tank as a permanent layer. After the permanent layer bricks are laid, lay the aluminum-magnesium-carbon tank edge bricks. Weld 28 pieces of pressure iron around the tank edge bricks. Press and weld them tightly, and then pour the tank edge castables.

[0090] S3, fill the wet mixed steel ladle tank casting material in S2 into the gap of tank edge bricks. After pouring, the tank edge must be vibrated evenly around the whole circle with a vibrating rod. Finally, fill and smooth the tank edge material to prevent the tank edge material from falling off early. After forming, naturally cure for 24 hours;

[0091] S4. After natural curing in the air for 24 hours, baking treatment is carried out to obtain the finished ladle rim castable.

[0092] Embodiment 2:

[0093] A ladle rim castable comprises the following components in parts by weight:

[0094] 8 parts of CA-60 cement;

[0095] 12 parts of CA-75 cement;

[0096] Clay waste 15 parts;

[0097] 25 parts of high aluminum skateboard polishing regeneration powder;

[0098] 5 parts of high-aluminum and low-silicon steel pipe crushed materials from scrap steel ladle;

[0099] 15 parts of waste brick slag tailings;

[0100] 4 parts of kyanite;

[0101] 6 parts of alumina powder;

[0102] Silica powder 8 parts;

[0103] 0.2 parts of deflocculant;

[0104] 2 parts of enhancer.

[0105] A method for using the above-mentioned ladle tank rim castable comprises the following steps:

[0106] S1. Dry mix the components of the castable in the ladle tank for 2-3 minutes in strong stirring, add water and wet mix for ≥5 minutes, with the amount of water added being 10%;

[0107] S2. Lay a layer of high-alumina bricks in the ladle tank as a permanent layer. After the permanent layer bricks are laid, lay the aluminum-magnesium-carbon tank edge bricks. Weld 28 pieces of pressure iron around the tank edge bricks. Press and weld them tightly, and then pour the tank edge castables.

[0108] S3, fill the wet mixed steel ladle tank casting material in S2 into the gap of tank edge bricks. After pouring, the tank edge must be vibrated evenly around the whole circle with a vibrating rod. Finally, fill and smooth the tank edge material to prevent the tank edge material from falling off early. After forming, naturally cure for 24 hours;

[0109] S4. After natural curing in the air for 24 hours, baking treatment is carried out to obtain the finished ladle rim castable.

[0110] Embodiment 3:

[0111] A ladle rim castable comprises the following components in parts by weight:

[0112] 4 parts of CA-60 cement;

[0113] 6 parts of CA-75 cement;

[0114] Clay waste 20 parts;

[0115] 25 parts of high aluminum skateboard polishing regeneration powder;

[0116] 25 parts of waste brick slag tailings;

[0117] 4 parts of kyanite;

[0118] 6 parts of alumina powder;

[0119] Silica powder 9 parts;

[0120] 0.2 parts of deflocculant;

[0121] 1 part enhancer.

[0122] A method for using the above-mentioned ladle tank rim castable comprises the following steps:

[0123] S1. Dry mix the components of the castable in the ladle tank for 2-3 minutes in strong stirring, add water and wet mix for ≥5 minutes, with the amount of water added being 10%;

[0124] S2. Lay a layer of high-alumina bricks in the ladle tank as a permanent layer. After the permanent layer bricks are laid, lay the aluminum-magnesium-carbon tank edge bricks. Weld 28 pieces of pressure iron around the tank edge bricks. Press and weld them tightly, and then pour the tank edge castables.

[0125] S3, fill the wet mixed steel ladle tank casting material in S2 into the gap of tank edge bricks. After pouring, the tank edge must be vibrated evenly around the whole circle with a vibrating rod. Finally, fill and smooth the tank edge material to prevent the tank edge material from falling off early. After forming, naturally cure for 24 hours;

[0126] S4. After natural curing in the air for 24 hours, baking treatment is carried out to obtain the finished ladle rim castable.

[0127] The performance of the finished steel ladle castables obtained in Examples 1-3 was tested, and the test results are shown in Table 1 below:

[0128] Table 1 Performance test results

[0129]

[0130] It can be seen from the above table that the finished ladle tank rim castables obtained in Examples 1-3 all have excellent flexural strength, compressive strength and linear change rate after firing. The performance of Example 2 is significantly better than that of Example 1 and Example 3. The room temperature and high temperature flexural and compressive strengths of Example 2 are higher than those of Example 1 and Example 3, and the linear change rate after high temperature firing is also significantly better than that of Example 1 and Example 3. It is preferred to use the component composition and method of Example 2 to prepare the finished ladle tank rim castable.

[0131] The ladle rim castable of this embodiment and the use method thereof optimize the high-temperature performance index of the product, effectively solve the problems of product spalling, low strength, and poor scouring resistance, and are resistant to molten steel scouring and slag erosion. The resistance to slag erosion and scouring is better than similar products, and the recycling of waste refractory materials is achieved, turning waste into treasure, saving energy and protecting the environment, and having significant economic benefits.

[0132] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A ladle tank rim casting material, characterized in that: It comprises the following components by weight parts: 4 - 8 parts of CA - 60 cement; 4 - 12 parts of CA - 75 cement; 10 - 20 parts of clay waste; 25 - 30 parts of polished recycled powder of high - alumina slide plate; 5 - 10 parts of crushed material of waste ladle high - alumina low - silicon through - steel pipe; 10 - 25 parts of waste brick slag tailings; 2 - 4 parts of kyanite; 5 - 6 parts of alumina micro - powder; 8 - 9 parts of silica micro - powder; 0.2 - 0.3 parts of deflocculant; 0.5 - 2 parts of reinforcing agent.

2. The ladle rim castable according to claim 1, characterized in that: The CA - 60 cement comprises the following components by weight percentage: 0 < SiO2 ≤ 0.3%, 60% ≤ Al2O3 < 68%, 0 < Fe2O3 ≤ 3.0%, 0 < alkali metal oxides ≤ 0.50%, 0 < S ≤ 0.20% and 0 < Cl ≤ 0.1%, and the alkali metal oxides are at least one of K2O and Na2O.

3. The ladle rim castable according to claim 1, characterized in that: The CA - 75 cement comprises the following components by weight percentage: 0 < SiO2 ≤ 0.3%, 73% ≤ Al2O3 < 75%, 0 < Fe2O3 ≤ 0.3%, 0 < alkali metal oxides ≤ 0.50%, 0 < S ≤ 0.20% and 0 < Cl ≤ 0.1%, and the alkali metal oxides are at least one of K2O and Na2O.

4. The ladle rim castable according to claim 1, characterized in that: The polished recycled powder of high - alumina slide plate comprises the following components by weight percentage: Al2O3 ≥ 75%, Fe2O3 ≤ 1%, C ≥ 5%, MgO ≤ 1.05%, H2O ≤ 1.0%.

5. The ladle rim castable according to claim 1, characterized in that: The crushed material of waste ladle high - alumina low - silicon through - steel pipe comprises the following components by weight percentage: SiO2 ≥ 9.0%, Al2O3 ≥ 75%, Fe2O3 ≤ 0.2%, C ≥ 10%, H2O ≤ 1.0%.

6. The ladle rim castable according to any one of claims 1 to 5, characterized in that: The reinforcing agent is Q195 bow - shaped steel fiber, and the particle size of the steel fiber is 0.2 - 20 mm.

7. The ladle rim castable according to any one of claims 1 to 5, characterized in that: The particle size of the clay waste is 0 - 5 mm, the particle size of the waste brick slag tailings is 0.088 - 10 mm; the particle size of the kyanite is 0.2 - 1 mm; the particle size of the alumina micro - powder is 2 - 5 μm; the particle size of the silica micro - powder is 0.15 - 5 μm; the deflocculant is sodium tripolyphosphate, and the particle size of the deflocculant is not more than 0.088 mm.

8. A method for using the ladle rim castable according to any one of claims 1 to 7, characterized in that: It includes the following operation steps: S1. First, dry - mix the components of the gunning mix for the ladle shell to form a dry - mix material, and then add water to the dry - mix material for wet - mixing to form a mixed material, thus making the gunning mix for the ladle shell; S2. Build a layer of high - alumina bricks as the permanent layer in the ladle shell. After the permanent - layer bricks are built, build the aluminum - magnesium - carbon ladle - rim bricks, and weld pressure iron blocks around the ladle - rim bricks; S3. Fill the gunning mix for the ladle shell obtained in S1 into the gaps between the ladle - rim bricks, then tamp and level the gunning mix. After molding, cure it naturally in the air for a period of time; S4. After the curing is completed, conduct baking treatment to obtain the finished product of the gunning mix for the ladle shell.

9. The method for using the ladle tank rim castable according to claim 8, characterized in that: In step S1, the water addition amount in the dry - mix material is 8 - 12% of the total mass of the dry - mix material.

10. The method for using the ladle tank rim castable according to claim 8, characterized in that: After the gunning mix for the ladle shell is filled into the gaps between the ladle - rim bricks in step S3, use a vibrating rod to vibrate the perimeter evenly along the entire circle of the ladle - rim bricks.

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