Water nozzle flow controller for continuous casting tundish and preparation method of water nozzle flow controller

Abstract

The invention relates to a nozzle flow controller for a continuous casting tundish and a preparation method of the nozzle flow controller, and the method comprises the following steps: uniformly mixing and grinding a binding agent and a granular material, adding a powder material into the uniformly mixed and ground material, and mixing and grinding for 3-8 minutes to obtain a mixture to be formed; and based on the to-be-formed mixture, a flow controller mold is installed, vibration pressure forming is adopted, and the formed mixture is subjected to demolding. And the demolded mixture is subjected to heat preservation for 6-36 hours under the condition of 180-320 DEG C, then heat preservation is conducted for 3-8 hours under the condition of 1600 DEG C argon or vacuum, firing is conducted, and the nozzle flow controller for the continuous casting tundish is obtained. The granular material comprises 55 to 70 wt% of microporous magnesia particles, 2 to 15 wt% of magnesium aluminate spinel particles, 2 to 10 wt% of corundum fine powder, 2 to 5 wt% of monocalcium aluminate fine powder, 2 to 5 wt% of calcium dialuminate fine powder, 2 to 5 wt% of calcium hexaluminate fine powder, 3 to 10 wt% of steel slag fine powder, 0.1 to 0.5 wt% of asphalt powder and 0.1 to 0.3 wt% of carbon black powder, and the binder is 2 to 5 wt% of resin.

Description

Technical Field

[0001] The present invention relates to the technical field of continuous casting refractories, and particularly to a nozzle flow controller for a continuous casting tundish and a preparation method thereof. Background Art

[0002] The tundish plays a crucial role in the continuous casting process of molten steel, with basic functions such as flow diversion, pressure stabilization, conditioning, and temperature control. With the increasing demand for special steel grades and the growing quality requirements for steel, various secondary refining technologies outside the furnace have been developed, which can significantly improve the cleanliness of molten steel. However, it may be re-contaminated after pouring into the tundish during continuous casting. Therefore, the continuous casting tundish is not only a simple transitional container before the solidification of molten steel, but more importantly, an important continuous metallurgical reactor. As the last refractory container in contact with molten steel, due to its large volume and stable and controllable flow conditions, the tundish is regarded as an important process for the floating and removal of non-metallic inclusions and the production of clean molten steel.

[0003] Inclusions seriously affect the properties and surface quality of steel, directly influencing the plasticity, toughness, fatigue resistance, deep drawing formability, welding performance, and surface finish of steel. Inclusion control is a systematic project in the metallurgical industry. At present, with the continuous improvement of the requirements for the quality of continuous casting billets and the cleanliness of molten steel, the metallurgical functions of the tundish have received increasing attention. In addition to traditional means of controlling and optimizing the tundish flow field, such as dams, weirs, flow dividers, and turbulence controllers, various new tundish metallurgical technologies have been developed, such as gas curtain dams with microbubbles for metallurgy and porous ceramic filtration of inclusions. Most of these new tundish metallurgical technologies require corresponding functional refractories as support to remove inclusions as efficiently as possible. However, during the tundish pouring process, especially in the non-steady pouring stage, including the start of pouring, tundish changeover, and end of pouring, problems such as slag entrainment and secondary oxidation are likely to occur. At the same time, the swirl or eddy current at the nozzle outlet is likely to cause the slag-steel mixture to flow into the mold through the nozzle and nozzle clogging, resulting in a significant increase in the number of inclusions in the steel. Unqualified continuous casting billets often need to be downgraded or scrapped.

[0004] Therefore, the existing tundish flow field control technology still needs to be further optimized in developing key functional refractories to support the stable control of the cleanliness of molten steel in the above process. Summary of the Invention

[0005] Based on this, in view of the above technical problems, it is necessary to provide a nozzle flow controller for a continuous casting tundish and a preparation method thereof.

[0006] In a first aspect, the present invention provides a preparation method for a nozzle flow controller for a continuous casting tundish, the method comprising: Mixing a binder and particulate materials evenly, and adding powder materials to the evenly mixed materials and mixing for 3 - 8 minutes to obtain a mixture to be shaped; Based on the mixture to be formed, install a flow controller mold and use vibration pressure molding, and then demold the formed mixture. Place the demolded mixture under heat preservation at 180~320°C for 6~36 hours, and then fire it under heat preservation at 1600°C in argon or vacuum for 3~8 hours to obtain a flow controller for a continuous casting tundish. Among them, the granular material includes 55~70wt% of microporous magnesite particles, 2~15wt% of magnesia-alumina spinel particles, 2~10wt% of corundum fine powder, 2~5wt% of calcium monoaluminate fine powder, 2~5wt% of calcium dialuminate fine powder, 2~5wt% of hexaaluminate calcium fine powder, 3~10wt% of steel slag fine powder, 0.1~0.5wt% of asphalt powder, and 0.1~0.3wt% of carbon black powder, and the binder is 2~5wt% of resin.

[0007] Further, the MgO content in the microporous magnesite particles exceeds 95wt%, and the bulk density of the microporous magnesite particles is lower than 3.4g / cm 3 , and the particle size is 5~0.088mm.

[0008] Further, the MgO content in the magnesia-alumina spinel particles exceeds 30wt%, and the particle size of the magnesia-alumina spinel particles is 3~0.088mm.

[0009] Further, the Al 2 O 3 content in the corundum fine powder exceeds 99wt%, and the particle size of the corundum fine powder is less than 0.088mm.

[0010] Further, the CaAl 2 O 4 content in the calcium monoaluminate fine powder exceeds 94wt%, and the particle size D 50 of the calcium monoaluminate fine powder is lower than 25μm.

[0011] Further, the particle size D 50 of the calcium dialuminate fine powder is less than 10μm.

[0012] Further, the particle size of the steel slag fine powder is less than 0.088mm, and the composition of the steel slag fine powder includes CaO, Al 2 O 3 , MgO, SiO 2 , and FeOx, and the total content of CaO, Al 2 O 3 , MgO, SiO 2 and FeOx in the steel slag fine powder exceeds 95wt%, and the content of FeOx is lower than 10wt%.

[0013] Furthermore, the resin used in the binder is a combination of one or more of phenolic resin and silicone resin.

[0014] In a second aspect, the present invention provides a nozzle flow controller for a continuous casting tundish, which is prepared by using the preparation method of the nozzle flow controller for a continuous casting tundish described in the first aspect.

[0015] In the above-mentioned nozzle flow controller for a continuous casting tundish and its preparation method, during the firing process, the fine steel slag powder, calcium monoaluminate and calcium dialuminate first form a certain liquid phase together. FeOx in the fine steel slag powder will promote the generation of a large number of active free radicals such as superoxide free radicals to promote sintering, and then promote the dissolution of corundum fine powder into this liquid phase and in-situ precipitation of calcium hexaaluminate, which together with the added calcium hexaaluminate forms a high-strength high-temperature ceramic bond, improving the erosion resistance and thermal shock resistance of the flow controller. Secondly, the above-mentioned liquid phase can quickly penetrate and gradually dissolve the interface layer of microporous magnesite particles. The dissolution of MgO in the fine steel slag powder and its synergistic effect with FeOx will form a large number of superoxide free radicals in the liquid phase. These superoxide free radicals will quickly form oxygen and escape under argon or vacuum conditions, making the material have excellent deoxidation and impurity removal capabilities during use. During the use process, the active carbon material in the material can remove newly generated trace superoxide free radicals to ensure the impurity removal performance. At the same time, since a large number of highly active superoxide free radicals in the material have been removed in advance, the carbon structure of the material can be continuously maintained and form a composite bonding system with the ceramic structure, making the material have a better service life. Therefore, the nozzle flow controller prepared by this method can effectively block non-metallic inclusions in the casting area of the tundish, reduce the rise of the rod position caused by the turbulent flow of the stopper rod head during the tundish casting process, stabilize the liquid level fluctuation in the mold, is convenient to install and has a long service life, and can better support the stable control of the molten steel cleanliness. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic flow chart of the preparation method of the nozzle flow controller for a continuous casting tundish provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the description of the present invention are for illustrative purposes only and do not represent the only implementation manner.

[0020] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0021] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first feature is in direct contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is at a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is at a lower horizontal height than the second feature.

[0022] Unless otherwise defined, all technical and scientific terms used in the description of the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used in the description of the present invention are only for the purpose of describing specific implementation manners and are not intended to limit the present invention. The term "and / or" used in the description of the present invention includes any and all combinations of one or more of the related listed items.

[0023] The following will be combined with Figure 1 Describe the tundish nozzle flow controller for continuous casting of the present invention and its preparation method.

[0024] Example 1: The preparation method of the nozzle flow controller for continuous casting tundish provided by the present invention, in combination with Figure 1 as shown, includes the following steps: Step S110, uniformly mix the binder and granular materials, and add powder materials to the uniformly mixed materials and mix for 3 - 8 min to obtain a mixture to be molded.

[0025] Among them, the granular materials include 55 - 70 wt% of microporous magnesia particles, 2 - 15 wt% of magnesia-aluminum spinel particles, 2 - 10 wt% of corundum fine powder, 2 - 5 wt% of calcium monoaluminate fine powder, 2 - 5 wt% of calcium dialuminate fine powder, 2 - 5 wt% of calcium hexaaluminate fine powder, 3 - 10 wt% of steel slag fine powder, 0.1 - 0.5 wt% of asphalt powder, and 0.1 - 0.3 wt% of carbon black powder, and the binder is 2 - 5 wt% of resin.

[0026] Step S120, based on the mixture to be molded, install the flow controller mold and use vibration pressure molding, and demold the molded mixture.

[0027] Step S130, place the demolded mixture under the condition of 180 - 320 °C for heat preservation for 6 - 36 hours, and then fire it under the condition of 1600 °C in argon or vacuum for heat preservation for 3 - 8 hours to obtain the nozzle flow controller for continuous casting tundish.

[0028] Comparative Example 1: Step 1, uniformly mix the binder and granular materials, and add powder materials to the uniformly mixed materials and mix for 3 - 8 min to obtain a mixture to be molded.

[0029] Specifically, the granular materials include 55 - 70 wt% of microporous magnesia particles, 2 - 15 wt% of magnesia-aluminum spinel particles, 2 - 10 wt% of corundum fine powder, 2 - 5 wt% of calcium monoaluminate fine powder, 2 - 5 wt% of calcium dialuminate fine powder, 2 - 5 wt% of calcium hexaaluminate fine powder, 3 - 10 wt% of steel slag fine powder, 0.1 - 0.5 wt% of asphalt powder, and 0.1 - 0.3 wt% of carbon black powder, and the binder is 2 - 5 wt% of resin. Among them, the MgO content in the microporous magnesia particles exceeds 95 wt%, and the bulk density of the microporous magnesia particles is lower than 3.4 g / cm 3 , and the particle size is 5 - 0.088 mm.

[0030] Step 2, based on the mixture to be molded, install the flow controller mold and use vibration pressure molding, and demold the molded mixture.

[0031] Step 3, place the demolded mixture under the condition of 180 - 320 °C for heat preservation for 6 - 36 hours, and then fire it under the condition of 1600 °C in argon or vacuum for heat preservation for 3 - 8 hours to obtain the nozzle flow controller for continuous casting tundish.

[0032] Comparative Example 2: Step 1: Mix the binder and granular materials evenly, and add powder materials to the evenly mixed materials and mix for 3 - 8 min to obtain a mixture to be molded.

[0033] Specifically, the granular materials include 55 - 70 wt% of microporous magnesia particles, 2 - 15 wt% of magnesia-alumina spinel particles, 2 - 10 wt% of corundum fine powder, 2 - 5 wt% of calcium monoaluminate fine powder, 2 - 5 wt% of calcium dialuminate fine powder, 2 - 5 wt% of calcium hexaaluminate fine powder, 3 - 10 wt% of steel slag fine powder, 0.1 - 0.5 wt% of asphalt powder, and 0.1 - 0.3 wt% of carbon black powder. The binder is 2 - 5 wt% of resin. Among them, the MgO content in the microporous magnesia particles exceeds 95 wt%, and the bulk density of the microporous magnesia particles is lower than 3.4 g / cm 3 , and the particle size is 5 - 0.088 mm. The MgO content in the magnesia-alumina spinel particles exceeds 30 wt%, and the particle size of the magnesia-alumina spinel particles is 3 - 0.088 mm.

[0034] Step 2: Based on the mixture to be molded, install a flow controller mold and use vibration pressure molding, and demold the molded mixture.

[0035] Step 3: Place the demolded mixture under the condition of 180 - 320 °C for heat preservation for 6 - 36 hours, and then fire it under the condition of 1600 °C in argon or vacuum for heat preservation for 3 - 8 hours to obtain a flow controller for the tundish of continuous casting.

[0036] Comparative Example 3: Step 1: Mix the binder and granular materials evenly, and add powder materials to the evenly mixed materials and mix for 3 - 8 min to obtain a mixture to be molded.

[0037] Specifically, the granular materials include 55 - 70 wt% of microporous magnesia particles, 2 - 15 wt% of magnesia-alumina spinel particles, 2 - 10 wt% of corundum fine powder, 2 - 5 wt% of calcium monoaluminate fine powder, 2 - 5 wt% of calcium dialuminate fine powder, 2 - 5 wt% of calcium hexaaluminate fine powder, 3 - 10 wt% of steel slag fine powder, 0.1 - 0.5 wt% of asphalt powder, and 0.1 - 0.3 wt% of carbon black powder. The binder is 2 - 5 wt% of resin. Among them, the MgO content in the microporous magnesia particles exceeds 95 wt%, and the bulk density of the microporous magnesia particles is lower than 3.4 g / cm 3 , and the particle size is 5 - 0.088 mm. The MgO content in the magnesia-alumina spinel particles exceeds 30 wt%, and the particle size of the magnesia-alumina spinel particles is 3 - 0.088 mm. The Al in the corundum fine powder 2 O 3The content exceeds 99 wt%, and the particle size of the corundum fine powder is less than 0.088 mm.

[0038] Step 2: Based on the mixture to be molded, install a flow controller mold and use vibration pressure molding, and then demold the molded mixture.

[0039] Step 3: Place the demolded mixture under the condition of 180 - 320 °C for heat preservation for 6 - 36 hours, and then fire it under the condition of 1600 °C in argon or vacuum for heat preservation for 3 - 8 hours to obtain a nozzle flow controller for continuous casting tundish.

[0040] Comparative Example 4: Step 1: Mix the binder and granular materials evenly, and add powder materials to the evenly mixed materials and mix them for 3 - 8 min to obtain a mixture to be molded.

[0041] Specifically, the granular materials include 55 - 70 wt% of microporous magnesia particles, 2 - 15 wt% of magnesia-alumina spinel particles, 2 - 10 wt% of corundum fine powder, 2 - 5 wt% of calcium monoaluminate fine powder, 2 - 5 wt% of calcium dialuminate fine powder, 2 - 5 wt% of calcium hexaaluminate fine powder, 3 - 10 wt% of steel slag fine powder, 0.1 - 0.5 wt% of asphalt powder, and 0.1 - 0.3 wt% of carbon black powder. The binder is 2 - 5 wt% of resin. Among them, the MgO content in the microporous magnesia particles exceeds 95 wt%, and the bulk density of the microporous magnesia particles is lower than 3.4 g / cm 3 , and the particle size is 5 - 0.088 mm. The MgO content in the magnesia-alumina spinel particles exceeds 30 wt%, and the particle size of the magnesia-alumina spinel particles is 3 - 0.088 mm. The Al 2 O 3 content in the corundum fine powder exceeds 99 wt%, and the particle size of the corundum fine powder is less than 0.088 mm. The CaAl 2 O 4 content in the calcium monoaluminate fine powder exceeds 94 wt%, and the particle size D 50 of the calcium monoaluminate fine powder is lower than 25 μm.

[0042] Step 2: Based on the mixture to be molded, install a flow controller mold and use vibration pressure molding, and then demold the molded mixture.

[0043] Step 3: Place the demolded mixture under the condition of 180 - 320 °C for heat preservation for 6 - 36 hours, and then fire it under the condition of 1600 °C in argon or vacuum for heat preservation for 3 - 8 hours to obtain a nozzle flow controller for continuous casting tundish.

[0044] Comparative Example 5: Step 1: Mix the binder and granular materials evenly, and add powder materials to the evenly mixed materials and mix them for 3 - 8 min to obtain a mixture to be molded.

[0045] Specifically, the granular material includes 55-70 wt% of microporous magnesite particles, 2-15 wt% of magnesia-alumina spinel particles, 2-10 wt% of corundum fine powder, 2-5 wt% of calcium monoaluminate fine powder, 2-5 wt% of calcium dialuminate fine powder, 2-5 wt% of calcium hexaaluminate fine powder, 3-10 wt% of steel slag fine powder, 0.1-0.5 wt% of asphalt powder, and 0.1-0.3 wt% of carbon black powder. The binder is 2-5 wt% of resin. Among them, the MgO content in the microporous magnesite particles exceeds 95 wt%, and the bulk density of the microporous magnesite particles is lower than 3.4 g / cm 3 , and the particle size is 5-0.088 mm. The MgO content in the magnesia-alumina spinel particles exceeds 30 wt%, and the particle size of the magnesia-alumina spinel particles is 3-0.088 mm. The Al 2 O 3 content in the corundum fine powder exceeds 99 wt%, and the particle size of the corundum fine powder is less than 0.088 mm. The CaAl 2 O 4 content in the calcium monoaluminate fine powder exceeds 94 wt%, and the particle size D 50 of the calcium monoaluminate fine powder is lower than 25 μm. The particle size D 50 of the calcium dialuminate fine powder is less than 10 μm.

[0046] Step 2: Based on the mixture to be molded, install a flow controller mold and use vibration pressure molding, and then demold the molded mixture.

[0047] Step 3: Place the demolded mixture under the condition of 180-320 °C for heat preservation for 6-36 hours, and then fire it under the condition of 1600 °C in argon or vacuum for heat preservation for 3-8 hours to obtain a flow controller for the tundish of continuous casting.

[0048] Comparative Example 6: Step 1: Mix the binder and the granular material evenly, and add the powder to the evenly mixed material and mix for 3-8 min to obtain the mixture to be molded.

[0049] Specifically, the granular material includes 55-70 wt% of microporous magnesite particles, 2-15 wt% of magnesia-alumina spinel particles, 2-10 wt% of corundum fine powder, 2-5 wt% of calcium monoaluminate fine powder, 2-5 wt% of calcium dialuminate fine powder, 2-5 wt% of calcium hexaaluminate fine powder, 3-10 wt% of steel slag fine powder, 0.1-0.5 wt% of asphalt powder, and 0.1-0.3 wt% of carbon black powder. The binder is 2-5 wt% of resin. Among them, the MgO content in the microporous magnesite particles exceeds 95 wt%, and the bulk density of the microporous magnesite particles is lower than 3.4 g / cm 3, with a particle size of 5 - 0.088 mm. The MgO content in the magnesia-alumina spinel particles exceeds 30 wt%, and the particle size of the magnesia-alumina spinel particles is 3 - 0.088 mm. The Al in the corundum fine powder 2 O 3 content exceeds 99 wt%, and the particle size of the corundum fine powder is less than 0.088 mm. The CaAl in the calcium aluminate monophosphate fine powder 2 O 4 content exceeds 94 wt%, and the particle size D of the calcium aluminate monophosphate fine powder 50 is less than 25 μm. The particle size D of the calcium dialuminate fine powder 50 is less than 10 μm. The particle size of the steel slag fine powder is less than 0.088 mm, and the composition of the steel slag fine powder includes CaO, Al 2 O 3 , MgO, SiO 2 and FeOx, and the total content of CaO, Al 2 O 3 , MgO, SiO 2 and FeOx in the steel slag fine powder exceeds 95 wt%, and the content of FeOx is less than 10 wt%.

[0050] Step 2, based on the mixture to be formed, install a flow controller mold and use vibration pressure forming, and demold the formed mixture.

[0051] Step 3, place the demolded mixture under the condition of 180 - 320 °C for heat preservation for 6 - 36 hours, and then fire it under the condition of 1600 °C in argon or vacuum for heat preservation for 3 - 8 hours to obtain a flow controller for the tundish of continuous casting.

[0052] Comparative Example 7: Step 1, mix and knead the binder and the granular material evenly, and add the powder material to the evenly mixed material and knead for 3 - 8 min to obtain a mixture to be formed.

[0053] Specifically, the granular material includes 55 - 70 wt% of microporous magnesite particles, 2 - 15 wt% of magnesia-alumina spinel particles, 2 - 10 wt% of corundum fine powder, 2 - 5 wt% of calcium aluminate monophosphate fine powder, 2 - 5 wt% of calcium dialuminate fine powder, 2 - 5 wt% of calcium hexaaluminate fine powder, 3 - 10 wt% of steel slag fine powder, 0.1 - 0.5 wt% of asphalt powder, and 0.1 - 0.3 wt% of carbon black powder, and the binder is 2 - 5 wt% of resin. Among them, the MgO content in the microporous magnesite particles exceeds 95 wt%, and the bulk density of the microporous magnesite particles is less than 3.4 g / cm 3 , with a particle size of 5 - 0.088 mm. The MgO content in the magnesia-alumina spinel particles exceeds 30 wt%, and the particle size of the magnesia-alumina spinel particles is 3 - 0.088 mm. The Al in the corundum fine powder 2 O3 The content exceeds 99 wt%, and the particle size of the corundum fine powder is less than 0.088 mm. In the calcium monoaluminate fine powder, the content of CaAl 2 O 4 exceeds 94 wt%, and the particle size D of the calcium monoaluminate fine powder 50 is less than 25 μm. The particle size D of the calcium dialuminate fine powder 50 is less than 10 μm. The particle size of the steel slag fine powder is less than 0.088 mm. The composition of the steel slag fine powder includes CaO, Al 2 O 3 , MgO, SiO 2 and FeOx, and the total content of CaO, Al 2 O 3 , MgO, SiO 2 and FeOx in the steel slag fine powder exceeds 95 wt%, and the content of FeOx is less than 10 wt%. The resin used as the binder is a combination of one or more of phenolic resin and silicone resin.

[0054] Step 2: Based on the mixture to be molded, install a flow controller mold and use vibration pressure molding, and then demold the molded mixture.

[0055] Step 3: Place the demolded mixture at 180 - 320 °C for heat preservation for 6 - 36 hours, and then fire it at 1600 °C under argon or vacuum conditions for heat preservation for 3 - 8 hours to obtain a flow controller for the tundish of continuous casting.

[0056] Example 2: Step 1: Mix the binder and the granular materials evenly, and add the powder materials to the evenly mixed materials and mix for 5 min to obtain a mixture to be molded.

[0057] Specifically, the granular materials include 70 wt% of microporous magnesia particles, 2 wt% of magnesia-aluminum spinel particles, 10 wt% of corundum fine powder, 2 wt% of calcium monoaluminate fine powder, 2 wt% of calcium dialuminate fine powder, 5 wt% of hexaaluminate calcium fine powder, 6.6 wt% of steel slag fine powder, 0.1 wt% of asphalt powder, and 0.3 wt% of carbon black powder. The binder is 2 wt% of resin. Among them, the MgO content in the microporous magnesia particles is 95.8 wt%, and the bulk density of the microporous magnesia particles is 3.31 g / cm 3 , and the particle size is 5 - 0.088 mm. The MgO content in the magnesia-aluminum spinel particles is 46 wt%, and the particle size of the magnesia-aluminum spinel particles is 3 - 0.088 mm. The Al 2 O 3 content in the corundum fine powder is 99.4 wt%, and the particle size of the corundum fine powder is less than 0.088 mm. The CaAl 2 O 4The content is 95 wt%, and the particle size D of the monocalcium aluminate fine powder 50 is 22 μm. The particle size D of the dicalcium aluminate fine powder 50 is 9 μm. The particle size of the steel slag fine powder is less than 0.088 mm, and the composition of the steel slag fine powder includes CaO, Al 2 O 3 , MgO, SiO 2 and FeOx, and the total content of CaO, Al 2 O 3 , MgO, SiO 2 and FeOx in the steel slag fine powder is 98 wt%, and the content of FeOx is 7 wt%. The resin used as the binder is a combination of one or more of phenolic resin and silicone resin.

[0058] Step 2, based on the mixture to be molded, install a flow controller mold and use vibration pressure molding, and demold the molded mixture.

[0059] Step 3, place the demolded mixture at 180 °C for 36 hours, and then fire it at 1600 °C under argon or vacuum conditions for 6 hours to obtain a flow controller for the tundish of continuous casting.

[0060] Step 4, the obtained flow controller for the tundish of continuous casting is used in a two-strand slab continuous casting tundish. During the casting process, the fluctuation range of the stopper rod position and the mold level is reduced by 10%, the content of non-metallic inclusions with a particle size in the range of 30 - 70 microns in the cast slab is reduced by 15%, and the service life is synchronized with the continuous casting tundish and reaches 18 heats.

[0061] Example 3: Step 1, mix the binder and the granular material evenly, and add the powder material to the evenly mixed material and mix for 8 min to obtain the mixture to be molded.

[0062] Specifically, the granular material includes 65 wt% of microporous magnesia particles, 10 wt% of magnesia-alumina spinel particles, 7 wt% of corundum fine powder, 5 wt% of monocalcium aluminate fine powder, 2 wt% of dicalcium aluminate fine powder, 4 wt% of hexaaluminate calcium fine powder, 3 wt% of steel slag fine powder, 0.5 wt% of asphalt powder, and 0.1 wt% of carbon black powder. The binder is 3.4 wt% of resin. Among them, the MgO content in the microporous magnesia particles is 96.7 wt%, and the bulk density of the microporous magnesia particles is 3.35 g / cm 3 , and the particle size is 5 - 0.088 mm. The MgO content in the magnesia-alumina spinel particles is 47 wt%, and the particle size of the magnesia-alumina spinel particles is 3 - 0.088 mm. The Al 2 O 3The content is 99.6 wt%, and the particle size of the corundum fine powder is less than 0.088 mm. The CaAl in the calcium monoaluminate fine powder 2 O 4 content is 95.2 wt%, and the particle size D of the calcium monoaluminate fine powder 50 is 21 μm. The particle size D of the calcium dialuminate fine powder 50 is 7 μm. The particle size of the steel slag fine powder is less than 0.088 mm, and the composition of the steel slag fine powder includes CaO, Al 2 O 3 , MgO, SiO 2 and FeOx, and the total content of CaO, Al 2 O 3 , MgO, SiO 2 and FeOx in the steel slag fine powder is 97 wt%, and the content of FeOx is 6 wt%. The resin used as the binder is a combination of one or more of phenolic resin and silicone resin.

[0063] Step 2, based on the mixture to be molded, install a flow controller mold and use vibration pressure molding, and demold the molded mixture.

[0064] Step 3, place the demolded mixture at 200 °C for heat preservation for 24 hours, and then fire it at 1600 °C under argon or vacuum conditions for 8 hours to obtain a flow controller for the tundish of continuous casting.

[0065] Step 4, the obtained flow controller for the tundish of continuous casting is used in a four-strand square (round) billet continuous casting tundish. During the casting process, the fluctuation range of the stopper rod position and the mold level is reduced by 15%, the content of non-metallic inclusions with a particle size in the range of 30 - 70 microns in the cast billet is reduced by 20%, and the service life is synchronized with the continuous casting tundish and reaches 30 heats.

[0066] Example 4: Step 1, mix the binder and the granular materials evenly, and add the powder materials to the evenly mixed materials and mix for 3 min to obtain a mixture to be molded.

[0067] Specifically, the granular materials include 55 wt% of microporous magnesia particles, 15 wt% of magnesia-aluminum spinel particles, 2 wt% of corundum fine powder, 5 wt% of calcium monoaluminate fine powder, 5 wt% of calcium dialuminate fine powder, 2.6 wt% of hexaaluminate calcium fine powder, 10 wt% of steel slag fine powder, 0.2 wt% of asphalt powder, and 0.2 wt% of carbon black powder. The binder is 5 wt% of resin. Among them, the MgO content in the microporous magnesia particles is 95.2 wt%, and the bulk density of the microporous magnesia particles is 3.25 g / cm 3, with a particle size of 5 - 0.088 mm. The MgO content in the magnesium aluminate spinel particles is 36 wt%, and the particle size of the magnesium aluminate spinel particles is 3 - 0.088 mm. The Al 2 O 3 content in the corundum fine powder is 99.3 wt%, and the particle size of the corundum fine powder is less than 0.088 mm. The CaAl 2 O 4 content in the calcium monoaluminate fine powder is 94.2 wt%, and the particle size D 50 of the calcium monoaluminate fine powder is 24 μm. The particle size D 50 of the calcium dialuminate fine powder is less than 8 μm. The particle size of the steel slag fine powder is less than 0.088 mm. The composition of the steel slag fine powder includes CaO, Al 2 O 3 , MgO, SiO 2 , and FeOx, and the total content of CaO, Al 2 O 3 , MgO, SiO 2 and FeOx in the steel slag fine powder is 96 wt%, and the content of FeOx is 9 wt%. The resin used as the binder is a combination of one or more of phenolic resin and silicone resin.

[0068] Step 2, based on the mixture to be molded, install a flow controller mold and use vibration pressure molding, and demold the molded mixture.

[0069] Step 3, place the demolded mixture under the condition of 240 °C for heat preservation for 16 hours, and then fire it under the condition of 1600 °C in argon or vacuum for 3 hours to obtain a flow controller for the tundish of continuous casting.

[0070] Step 4, the obtained flow controller for the tundish of continuous casting is used in a two-strand heterogeneous billet continuous casting tundish. During the casting process, the fluctuation range of the stopper rod position and the mold level is reduced by 15%, the content of non-metallic inclusions with a particle size in the range of 30 - 70 microns in the cast billet is reduced by 15%, and the service life is synchronized with the continuous casting tundish and reaches 15 heats.

[0071] Example 5: Step 1, uniformly mix the binder and the granular material, and add the powder material to the uniformly mixed material and mix for 7 min to obtain a mixture to be molded.

[0072] Specifically, the granular material includes 65 wt% of microporous magnesite particles, 10 wt% of magnesia-alumina spinel particles, 5.4 wt% of corundum fine powder, 4 wt% of calcium monoaluminate fine powder, 5 wt% of calcium dialuminate fine powder, 2 wt% of hexaaluminate calcium fine powder, 7 wt% of steel slag fine powder, 0.5 wt% of asphalt powder, and 0.3 wt% of carbon black powder. The binder is 2.8 wt% of resin. Among them, the MgO content in the microporous magnesite particles is 95.3 wt%, and the bulk density of the microporous magnesite particles is 3.28 g / cm 3 , and the particle size is 5 - 0.088 mm. The MgO content in the magnesia-alumina spinel particles is 42 wt%, and the particle size of the magnesia-alumina spinel particles is 3 - 0.088 mm. The Al 2 O 3 content in the corundum fine powder is 99.4 wt%, and the particle size of the corundum fine powder is less than 0.088 mm. The CaAl 2 O 4 content in the calcium monoaluminate fine powder is 94.8 wt%, and the particle size D 50 of the calcium monoaluminate fine powder is 23 μm. The particle size D 50 of the calcium dialuminate fine powder is 6 μm. The particle size of the steel slag fine powder is less than 0.088 mm. The composition of the steel slag fine powder includes CaO, Al 2 O 3 , MgO, SiO 2 , and FeOx, and the total content of CaO, Al 2 O 3 , MgO, SiO 2 , and FeOx in the steel slag fine powder is 97 wt%, and the content of FeOx is 8 wt%. The resin used as the binder is a combination of one or more of phenolic resin and silicone resin.

[0073] Step 2: Based on the mixture to be molded, install a flow controller mold and use vibration pressure molding, and then demold the molded mixture.

[0074] Step 3: Place the demolded mixture under the condition of 320 °C for heat preservation for 6 hours, and then fire it under the condition of 1600 °C in argon or vacuum for heat preservation for 5 hours to obtain a flow controller for the tundish of continuous casting.

[0075] Step 4: The obtained flow controller for the tundish of continuous casting is used in a two-strand thin slab continuous casting tundish. During the casting process, the fluctuation range of the stopper rod position and the mold level is reduced by 20%, the content of non-metallic inclusions with a particle size in the range of 30 - 70 microns in the cast slab is reduced by 25%, and the service life is synchronized with the continuous casting tundish and reaches 20 heats.

[0076] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0077] The above-described embodiments merely represent several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the appended claims.

Claims

1. A method for preparing a water inlet flow controller for a continuous casting tundish, characterized in that: The method comprises: Mix and grind the binder and granular material evenly, and add the powder material to the evenly mixed material and grind for 3 to 8 minutes to obtain a mixture to be formed; Based on the mixture to be formed, a flow controller mold is installed and vibration pressure molding is adopted, and the formed mixture is demolded; The demoulded mixture is kept at 180-320°C for 6-36 hours, and then sintered at 1600°C for 3-8 hours under argon or vacuum conditions to obtain a water inlet flow controller for a continuous casting tundish; The granular material includes 55-70wt% of microporous magnesia sand particles, 2-15wt% of magnesia alumina spinel particles, 2-10wt% of corundum fine powder, 2-5wt% of monocalcium aluminate fine powder, 2-5wt% of calcium dialuminate fine powder, 2-5wt% of calcium hexaaluminate fine powder, 3-10wt% of steel slag fine powder, 0.1-0.5wt% of asphalt powder and 0.1-0.3wt% of carbon black powder, and the binder is 2-5wt% of resin.

2. The method for preparing a water inlet flow controller for a continuous casting tundish according to claim 1, characterized in that: The MgO content in the microporous magnesia particles exceeds 95wt%, and the volume density of the microporous magnesia particles is lower than 3.4g / cm 3 , particle size is 5~0.088mm.

3. The method for preparing a water inlet flow controller for a continuous casting tundish according to claim 2, characterized in that: The MgO content in the magnesia-alumina spinel particles exceeds 30 wt %, and the particle size of the magnesia-alumina spinel particles is 3 to 0.088 mm.

4. The method for preparing a water inlet flow controller for a continuous casting tundish according to claim 3, characterized in that: The Al2O3 content in the corundum fine powder exceeds 99wt%, and the particle size of the corundum fine powder is less than 0.088mm.

5. The method for preparing a water inlet flow controller for a continuous casting tundish according to claim 4, characterized in that: The CaAl2O4 content of the calcium aluminate fine powder exceeds 94wt%, and the particle size D 50 Less than 25μm.

6. The method for preparing a water inlet flow controller for a continuous casting tundish according to claim 5, characterized in that: The particle size D of the calcium aluminate fine powder 50 Less than 10μm.

7. The method for preparing a water inlet flow controller for a continuous casting tundish according to claim 6, characterized in that: The particle size of the steel slag fine powder is less than 0.088 mm, and the components of the steel slag fine powder include CaO, Al2O3, MgO, SiO2 and FeOx, and the total content of CaO, Al2O3, MgO, SiO2 and FeOx in the steel slag fine powder exceeds 95wt%, and the content of FeOx is less than 10wt%.

8. The method for preparing a water inlet flow controller for a continuous casting tundish according to claim 7, characterized in that: The resin used in the binder is a combination of one or more of phenolic resin and silicone resin.

9. A water inlet flow controller for a continuous casting tundish, characterized in that: The device is prepared by the method for preparing a water inlet flow controller for a continuous casting tundish as described in any one of claims 1 to 8.

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