CN113480293A - Low-cost environment-friendly tundish fire clay, preparation method and construction method - Google Patents
Low-cost environment-friendly tundish fire clay, preparation method and construction method Download PDFInfo
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- CN113480293A CN113480293A CN202111037217.6A CN202111037217A CN113480293A CN 113480293 A CN113480293 A CN 113480293A CN 202111037217 A CN202111037217 A CN 202111037217A CN 113480293 A CN113480293 A CN 113480293A
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Abstract
The invention provides low-cost environment-friendly tundish fire clay, a preparation method and a construction method, wherein the low-cost environment-friendly tundish fire clay comprises the following components in parts by mass: 5-40 parts of recycled aluminum-magnesium brick waste, 35-80 parts of magnesite, 0.5-5 parts of silica powder, 0.1-5 parts of clay, 0-4 parts of aluminate cement, 0.1-1 part of water reducing agent and 0.1-0.3 part of organic fiber. The tundish fire clay does not contain chromium, so that chromium pollution can be avoided; the waste material of the recycled aluminum-magnesium brick is used as the raw material, the waste is fully utilized, the production cost is reduced, and the waste material of the recycled aluminum-magnesium brick generates magnesium-aluminum spinel containing Al at high temperature2O3And the magnesium aluminate spinel is also generated by the reaction with MgO generated after the magnesite is decomposed, so that the volume shrinkage caused by the magnesite decomposition can be compensated, the gap between the fire clay and the tundish nozzle is avoided, and the problem of steel infiltration is solved.
Description
Technical Field
The invention belongs to the technical field of refractory materials, and particularly relates to low-cost environment-friendly tundish fire clay, a preparation method and a construction method.
Background
The fire clay for the tundish is used for embedding the tundish nozzle and is coated between the tundish nozzle and the brick cup. The traditional fire clay for the tundish mainly comprises aluminum chromium, chromium oxide is added into the fire clay, chromium trioxide in the fire clay is converted into toxic chromium trioxide after the tundish is used, if waste refractory materials are improperly recovered, harm and pollution to human bodies and the environment are easily caused, meanwhile, the aluminum chromium fire clay is high in viscosity, and inconvenient to paint in site construction. In addition, at present aluminium chromium matter fire clay is mostly used after water or liquid water glass stirs when the job site uses, also has the refractory manufacturer to use fire clay and aluminium dihydrogen phosphate solution misce bene back barrelling send to steelworks and use, nevertheless because of above-mentioned solution addition is more, it is great to lead to the volume shrink behind the fire clay construction, causes to appear the gap between fire clay and the mouth of a river, and the molten steel easily drills into from the gap between fire clay and the mouth of a river when the pouring basket is watered the steel and leads to oozing the steel, has the potential safety hazard. In addition, the raw materials of the chromium oxide, corundum or high bauxite used by the aluminum-chromium fire clay have higher cost and lower cost performance.
Disclosure of Invention
The invention solves the technical problem of providing the low-cost environment-friendly tundish fire clay, the preparation method and the construction method, the tundish fire clay does not contain chromium, and chromium pollution can be avoided; the waste material of the recycled aluminum-magnesium brick is used as the raw material, the waste is fully utilized, the production cost is reduced, and the waste material of the recycled aluminum-magnesium brick generates magnesium-aluminum spinel containing Al at high temperature2O3Also reacts with MgO generated after the magnesite is decomposed to generate magnesia-alumina spinel which generates volume expansion,the volume shrinkage caused by magnesite decomposition is compensated, a gap between the fire clay and a tundish nozzle is avoided, and the problem of steel infiltration is solved; the viscosity of the fire clay is reduced through proper raw material granularity gradation, and the field construction is convenient; by adding the organic fibers and utilizing the capillary channels generated by the decomposition of the organic fibers, the gas is discharged when the magnesite is decomposed, and the fire clay is prevented from cracking when the gas is discharged in a centralized manner.
In order to solve the problems, one aspect of the invention provides low-cost environment-friendly tundish fire clay, which comprises the following raw materials in parts by mass:
5-40 parts of recycled aluminum-magnesium brick waste, 35-80 parts of magnesite, 0.5-5 parts of silica powder, 0.1-5 parts of clay, 0-4 parts of aluminate cement, 0.1-1 part of water reducing agent and 0.1-0.3 part of organic fiber.
The low-cost environment-friendly tundish fire clay disclosed by the invention does not contain chromium, can avoid chromium pollution and is environment-friendly; wherein, the recycled alumina magnesia brick waste refers to the alumina magnesia carbon brick waste used in the processes of steel making and the like which is recycled and homogenized, and the alumina magnesia brick waste is crushed until the average grain diameter is 50mm to obtain the crushed alumina magnesia brick waste; and (3) carrying out iron removal treatment on the crushed waste materials of the aluminum-magnesium bricks, after iron removal, carrying out homogenization treatment again, crushing to the required particle size, and obtaining the regenerated waste materials of the aluminum-magnesium bricks. The added recycled aluminum-magnesium brick waste generates magnesium-aluminum spinel to expand at high temperature, and Al contained in the recycled aluminum-magnesium brick waste2O3The magnesium aluminate spinel generated by the reaction of the magnesium aluminate spinel with MgO generated by decomposing the added magnesite expands, so that the shrinkage of the fire clay caused by adding liquid can be compensated, and a gap between the fire clay and a tundish nozzle is avoided, thereby solving the problem of steel infiltration. But use regeneration aluminium magnesium brick waste material make full use of discarded object, reduce the manufacturing cost of middle package fire clay, but regeneration aluminium magnesium brick waste material is not to add more the better, because of regeneration aluminium magnesium brick waste material contains graphite more usually, graphite is relatively poor to the water wettability, consequently too much regeneration aluminium magnesium brick waste material can lead to fire clay to add the water yield and sharply increase, make the fire clay body porosity of good construction higher, intensity is relatively poor, regeneration aluminium magnesium brick waste material can lead to Al in the fire clay too little2O3A small amount of spinel which forms itself when used at high temperatures andthe spinel phase generated by the reaction with the magnesia generated after the magnesite is decomposed is less, the expansion of the fireclay is small, and the shrinkage of the fireclay caused by adding liquid can not be compensated. A large number of experimental researches show that when the components are mixed according to the mass parts, the production cost can be lower on the premise of ensuring better performance of the tundish fire clay. The silicon micropowder is high in surface activity, beneficial to improving the bonding strength of low and medium temperatures and reducing the sintering temperature, and can be filled in finer spaces after being dispersed, thereby being beneficial to reducing water, improving the fluidity, improving the density and improving the slag penetration resistance. The clay acts primarily as a cement, primarily by the colloidal nature of the clay-water system. The clay reacts with water to form a cementing substance with colloid property, and the cementing substance is decomposed by the action of electrolyte or dehydration to flocculate and harden, so that a certain bonding strength is generated. The aluminate cement is used for promoting the hardening of the fire clay and preventing the water gap of the tundish from moving downwards due to slow hardening after the construction of the fire clay, and the mechanism of the aluminate cement is CA and CA in the cement2、C12A7After mixing with water, Ca2+And Al (OH)4 -The plasma rapidly dissolves in the water to form Ca2+And Al (OH)4 -The aqueous solution quickly reaches saturation and then crystallizes out of the solution to form hydrate after the aqueous solution reaches saturation. These hydrated products are interconnected to form a staggered network structure so that setting and hardening occur. The water reducing agent can reduce the water adding amount of the fire clay and reduce the porosity of the fire clay. The system of dispersing fine powder such as silicon micropowder in water is a thermodynamically unstable system, and particles with small particle size are easy to flocculate to form a flocculated structure. The inclusion of a large amount of water in such a flocculent greatly increases the amount of water used in the fire clay. The flocculation characteristics of powders depend on their physical and chemical characteristics and on their fineness, generally the higher the fineness, the easier it is to flocculate and the greater the amount of water that is wrapped. The water reducing agent can destroy the flocculation structure and release the wrapped water to achieve the purpose of reducing water. The water reducing agent is surfactant, and is adsorbed on silicon particlesThe surface of the powder particles forms hydration films to prevent them from flocculating, and the flocculation structure is destroyed to release the free water which is wrapped, thereby reducing the water addition. The basic principle of the organic fiber explosion-proof agent is that the fibers are mutually overlapped in a blank body, and the fibers can be melted or burnt off to form communicated air holes in the heating and baking process, thereby being beneficial to decomposing water vapor and CO generated by magnesite in the dehydration process2Is discharged.
Preferably, the preparation raw materials comprise the following components in parts by weight:
10-35 parts of recycled alumina-magnesia brick waste, 45-70 parts of magnesite, 1-4 parts of silica powder, 0.2-3 parts of clay, 0.5-3 parts of aluminate cement, 0.1-0.8 part of water reducing agent and 0.1-0.25 part of organic fiber.
A large number of experimental trials find that when the components in the raw materials are selected according to the proportion, the interaction among the components is more appropriate, and the obtained low-cost environment-friendly tundish fire clay has better application performance and lower production cost.
Preferably, in the preparation raw materials, the mass ratio of the recycled magnesia alumina brick waste to the magnesite is 1: (1.125-3.5). A large number of experimental trials find that when the mass ratio of the recycled alumina magnesia brick waste to the magnesite in the raw materials is selected, the amount of magnesia-alumina spinel generated by the reaction of the recycled alumina magnesia brick waste and the magnesite at high temperature is optimum, so that the shrinkage of the fire clay can be better compensated, a gap between the fire clay and a tundish nozzle is avoided, and the problem of steel infiltration is solved.
Preferably, in the recycled aluminum-magnesia brick waste, Al is2O3The content is more than or equal to 50wt percent, and the C content is more than or equal to 4wt percent;
preferably, the content of MgO in the magnesite is more than or equal to 40 wt%.
Preferably, the water reducing agent is KF 21. The water reducing agent KF21 is a water reducing agent product of Leketer (Chongqing) chemical product Co., Ltd, and the effective component of the water reducing agent is a macromolecular compound taking amino, methoxy, hydroxyl, polyoxyethylene long chain and the like as functional groups. The main chain of the macromolecular compound of the water reducer is firmly adsorbed on the surface of the micro powder particles, so that the plasticity retention property of the water reducer can be effectively improved, and branches and chains surround the periphery of the micro powder particles, so that the effects of steric hindrance and electrostatic repulsion are achieved, and better dispersion and water reduction effects are realized.
Preferably, the organic fiber is polypropylene fiber with the specification of 3-6mm in length, 30-60 μm in diameter and 60-85 ℃ in melting point.
Preferably, the particle size of the recycled alumina magnesia brick waste is 0.074-0.083 mm;
preferably, the particle size of the magnesite is 0.074-0.083 mm;
preferably, the particle size of the silicon micropowder is 3-10 μm;
preferably, the clay has a particle size of 0.044-0.074 mm;
preferably, the particle size of the aluminate cement is 0.04-0.09 mm.
The low-cost environment-friendly tundish fire clay disclosed by the invention can be reasonably regulated and controlled in the grain size distribution of the raw materials, so that the fire clay has proper viscosity and is convenient for field construction.
Preferably, in the silicon micropowder, SiO2The content is more than or equal to 92 wt%;
preferably, in the clay, Al2O3The content is more than or equal to 30wt percent and SiO2Less than or equal to 55wt% of Fe2O3The content is less than or equal to 2.0wt percent;
preferably, in the aluminate cement, Al2O3The content is 66 to 74 weight percent, and the content of CaO is 25 to 30 weight percent.
Another aspect of the present invention provides a method for preparing the above low-cost environment-friendly tundish fire clay, comprising:
mixing the recycled alumina magnesia brick waste, magnesite, silica micropowder, clay, aluminate cement, a water reducing agent and organic fiber according to the selected mass parts to obtain the low-cost environment-friendly tundish fire clay.
In another aspect, the invention provides a construction method of the low-cost environment-friendly tundish fire clay, which comprises the following steps:
and mixing the low-cost environment-friendly tundish fire clay with water, stirring to obtain a construction material, and then constructing the construction material on a tundish, wherein the mass of the water is 20-24% of that of the low-cost environment-friendly tundish fire clay.
Compared with the prior art, the invention has the following beneficial effects:
1. the low-cost environment-friendly tundish fire clay disclosed by the invention does not contain chromium, can avoid chromium pollution and is environment-friendly; the added recycled aluminum-magnesium brick waste generates magnesium-aluminum spinel to expand at high temperature, and Al contained in the recycled aluminum-magnesium brick waste2O3The magnesium aluminate spinel generated by the reaction of the magnesium aluminate spinel with MgO generated by decomposing the added magnesite expands, so that the shrinkage of the fire clay caused by adding liquid can be compensated, a gap between the fire clay and a tundish nozzle is avoided, and the problem of steel infiltration is solved; the silicon micro powder does not generate a large amount of hydration products containing structural water after hydration, has less volatile and decomposed components, is beneficial to maintaining the structure and the strength of the fire clay after being heated, has high surface activity, is beneficial to improving the bonding strength of low and medium temperature and reducing the sintering temperature, can be filled in a finer space after being dispersed, is beneficial to reducing water, improving the fluidity and improving the density and the slag penetration resistance; the clay acts primarily as a cement, primarily by the colloidal nature of the clay-water system. The clay reacts with water to form a cementing substance with a colloid property, and the cementing substance is decomposed to flocculate and harden under the action of electrolyte or dehydration to generate certain bonding strength; the aluminate cement is used for promoting the hardening of the fire clay and preventing the water gap of the tundish from moving downwards due to slow hardening after the construction of the fire clay, and the mechanism of the aluminate cement is CA and CA in the cement2、C12A7After mixing with water, Ca2+And Al (OH)4 -The plasma rapidly dissolves in the water to form Ca2+And Al (OH)4 -The aqueous solution quickly reaches saturation and then crystallizes out of the solution to form hydrate after the aqueous solution reaches saturation. These hydrated products are interconnected to form a staggered network structure so that setting and hardening occur. The water reducing agent can reduce the water adding amount of the fire clay and reduce the porosity of the fire clay. The system of dispersing fine powder such as silicon micropowder in water is a thermodynamically unstable system, and particles with small particle size are easy to flocculate to form a flocculated structure. The inclusion of a large amount of water in such a flocculent greatly increases the amount of water used in the fire clay. The flocculation characteristics of powders depend on their physical and chemical characteristics and on their fineness, the higher the fineness generally, the easier it is toFlocculation, the larger the amount of water wrapped; the water reducing agent can destroy the flocculation structure and release the wrapped water to achieve the purpose of reducing water. The water reducing agent is a surfactant, and the water reducing agent is adsorbed on the surfaces of the silicon micropowder particles to form hydration films so as to prevent the silicon micropowder particles from flocculating, and a flocculation structure is destroyed to discharge the coated free water, so that the water adding amount is reduced; the basic principle of the organic fiber explosion-proof agent is that the fibers are mutually overlapped in a blank body, and the fibers can be melted or burnt off to form communicated air holes in the heating and baking process, thereby being beneficial to decomposing water vapor and CO generated by magnesite in the dehydration process2Is discharged.
2. The invention uses the waste materials of the recycled alumina magnesia bricks and the magnesite as raw materials, can fully utilize the waste materials, reduce the production cost of the tundish fireclay, and ensure that the production cost is lower and the economic benefit is obvious on the premise of ensuring better performance of the tundish fireclay by reasonable proportioning of the waste materials of the recycled alumina magnesia bricks and the magnesite in parts by mass.
3. The low-cost environment-friendly tundish fire clay disclosed by the invention has the advantages that the fire clay has proper viscosity through reasonable regulation and control of the particle size distribution of the raw materials, and the field construction is facilitated; the interaction among the components is more suitable by optimizing and controlling the distribution ratio of the components in the raw materials, and the low-cost environment-friendly tundish fire clay in the optimized distribution range has the best erosion resistance, scouring resistance and construction performance.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The low-cost environment-friendly tundish fire clay described in the embodiment is prepared from the following raw materials in parts by mass:
34 parts of recycled aluminum-magnesia brick waste with the granularity of 0.074-0.083mm, 60.6 parts of magnesite with the granularity of 0.074-0.083mm, 2.1 parts of silica powder with the granularity of 3-10 mu m, 1.8 parts of clay with the granularity of 0.044-0.074mm, 1.2 parts of aluminate cement with the granularity of 0.04-0.09mm, 0.2 part of water reducing agent KF21 and 0.1 part of polypropylene fiber.
Wherein, in the recycled aluminum-magnesia brick waste, Al2O3The content is more than or equal to 50wt percent, and the C content is more than or equal to 4wt percent;
in the magnesite, the content of MgO is more than or equal to 40 wt%;
in the fine silicon powder, SiO2The content is more than or equal to 92 wt%;
in clay, Al2O3The content is more than or equal to 30wt percent and SiO2Less than or equal to 55wt% of Fe2O3The content is less than or equal to 2.0wt percent;
in aluminate cement, Al2O3The content is 66 to 74 weight percent, and the content of CaO is 25 to 30 weight percent;
in the water reducing agent KF21, Al2O3The content of (B) is more than or equal to 92wt%, and the pH value is 6.8.
The polypropylene fiber specification is as follows: 3-6mm long, 30-60 μm diameter, and 60-85 deg.C melting point.
The method for preparing the low-cost environment-friendly tundish fire clay comprises the following steps:
weighing the waste materials of the recycled alumina-magnesia bricks, magnesite, silica micropowder, clay, aluminate cement, a water reducing agent and organic fibers according to the selected parts by weight; and pouring the weighed raw materials into a sand mixer to mix for 5-6min to obtain the low-cost environment-friendly tundish fire clay.
Example 2
The low-cost environment-friendly tundish fire clay described in the embodiment is prepared from the following raw materials in parts by mass:
31 parts of recycled aluminum-magnesia brick waste with the granularity of 0.074-0.083mm, 63.4 parts of magnesite with the granularity of 0.074-0.083mm, 2.9 parts of silica powder with the granularity of 3-10 mu m, 0.9 part of clay with the granularity of 0.044-0.074mm, 1.38 parts of aluminate cement with the granularity of 0.04-0.09mm, 0.3 part of water reducing agent KF21 and 0.12 part of polypropylene fiber.
Wherein, in the recycled aluminum-magnesia brick waste, Al2O3The content is more than or equal to 50 percent, and the C content is more than or equal to 4 percent;
in magnesite, the content of MgO is more than or equal to 40 percent;
in the fine silicon powder, SiO2The content is more than or equal to 92 percent;
in clay, Al2O3The content is more than or equal to 30 percent and SiO2Less than or equal to 55 percent of Fe2O3The content is less than or equal to 2.0 percent;
in aluminate cement, Al2O3The content is 66-74wt%, and the content of CaO is 25-30 wt%;
in the water reducing agent KF21, Al2O3The content of (A) is more than or equal to 92 percent, and the pH value is 6.8.
In the polypropylene fiber, the specification is as follows: 3-6mm long, 30-60 μm diameter, and 60-85 deg.C melting point.
The method for preparing the low-cost environment-friendly tundish fire clay comprises the following steps:
weighing the waste materials of the recycled alumina-magnesia bricks, magnesite, silica micropowder, clay, aluminate cement, a water reducing agent and organic fibers according to the selected parts by weight; and pouring the weighed raw materials into a sand mixer to mix for 5-6min to obtain the low-cost environment-friendly tundish fire clay.
Example 3
The low-cost environment-friendly tundish fire clay described in the embodiment is prepared from the following raw materials in parts by mass:
28 parts of recycled aluminum-magnesia brick waste with the granularity of 0.074-0.083mm, 66 parts of magnesite with the granularity of 0.074-0.083mm, 2.4 parts of silica powder with the granularity of 3-10 mu m, 1.5 parts of clay with the granularity of 0.044-0.074mm, 1.39 parts of aluminate cement with the granularity of 0.04-0.09mm, 0.6 part of water reducing agent KF21 and 0.11 part of polypropylene fiber.
Wherein, in the recycled aluminum-magnesia brick waste, Al2O3The content is more than or equal to 50 percent, and the C content is more than or equal to 4 percent;
in magnesite, the content of MgO is more than or equal to 40 percent;
in the fine silicon powder, SiO2The content is more than or equal to 92 percent;
in clay, Al2O3The content is more than or equal to 30 percent and SiO2Less than or equal to 55 percent of Fe2O3The content is less than or equal to 2.0 percent;
in aluminate cement, Al2O3The content is 66-74wt%, and the content of CaO is 25-30 wt%;
in the water reducing agent KF21, Al2O3The content of (A) is more than or equal to 92 percent, and the pH value is 6.8.
In the polypropylene fiber, the specification is as follows: 3-6mm long, 30-60 μm diameter, and 60-85 deg.C melting point.
The method for preparing the low-cost environment-friendly tundish fire clay comprises the following steps:
weighing the waste materials of the recycled alumina-magnesia bricks, magnesite, silica micropowder, clay, aluminate cement, a water reducing agent and organic fibers according to the selected parts by weight; and pouring the weighed raw materials into a sand mixer to mix for 5-6min to obtain the low-cost environment-friendly tundish fire clay.
Example 4
The low-cost environment-friendly tundish fire clay described in the embodiment is prepared from the following raw materials in parts by mass:
32.5 parts of recycled aluminum-magnesia brick waste with the granularity of 0.074-0.083mm, 61 parts of magnesite with the granularity of 0.074-0.083mm, 1.5 parts of silica powder with the granularity of 3-10 mu m, 2.5 parts of clay with the granularity of 0.044-0.074mm, 1.57 parts of aluminate cement with the granularity of 0.04-0.09mm, 0.8 part of water reducing agent KF21 and 0.13 part of polypropylene fiber.
Wherein, in the recycled aluminum-magnesia brick waste, Al2O3The content is more than or equal to 50 percent, and the C content is more than or equal to 4 percent;
in magnesite, the content of MgO is more than or equal to 40 percent;
in the fine silicon powder, SiO2The content is more than or equal to 92 percent;
in clay, Al2O3The content is more than or equal to 30 percent and SiO2Less than or equal to 55 percent of Fe2O3The content is less than or equal to 2.0 percent;
in aluminate cement, Al2O3The content is 66-74wt%, and the content of CaO is 25-30 wt%;
in the water reducing agent KF21, Al2O3The content of (A) is more than or equal to 92 percent, and the pH value is 6.8.
In the polypropylene fiber, the specification is as follows: 3-6mm long, 30-60 μm diameter, and 60-85 deg.C melting point.
The method for preparing the low-cost environment-friendly tundish fire clay comprises the following steps:
weighing the waste materials of the recycled alumina-magnesia bricks, magnesite, silica micropowder, clay, aluminate cement, a water reducing agent and organic fibers according to the selected parts by weight; and pouring the weighed raw materials into a sand mixer to mix for 5-6min to obtain the low-cost environment-friendly tundish fire clay.
Example 5
The low-cost environment-friendly tundish fire clay described in the embodiment is prepared from the following raw materials in parts by mass:
35 parts of recycled aluminum-magnesia brick waste with the granularity of 0.074-0.083mm, 58.4 parts of magnesite with the granularity of 0.074-0.083mm, 3.5 parts of silica powder with the granularity of 3-10 mu m, 0.5 part of clay with the granularity of 0.044-0.074mm, 1.76 parts of aluminate cement with the granularity of 0.04-0.09mm, 0.7 part of water reducing agent KF21 and 0.14 part of polypropylene fiber.
Wherein, in the recycled aluminum-magnesia brick waste, Al2O3The content is more than or equal to 50 percent, and the C content is more than or equal to 4 percent;
in magnesite, the content of MgO is more than or equal to 40 percent;
in the fine silicon powder, SiO2The content is more than or equal to 92 percent;
in clay, Al2O3The content is more than or equal to 30 percent and SiO2Less than or equal to 55 percent of Fe2O3The content is less than or equal to 2.0 percent;
in aluminate cement, Al2O3The content is 66-74wt%, and the content of CaO is 25-30 wt%;
in the water reducing agent KF21, Al2O3The content of (A) is more than or equal to 92 percent, and the pH value is 6.8.
In the polypropylene fiber, the specification is as follows: 3-6mm long, 30-60 μm diameter, and 60-85 deg.C melting point.
The method for preparing the low-cost environment-friendly tundish fire clay comprises the following steps:
weighing the waste materials of the recycled alumina-magnesia bricks, magnesite, silica micropowder, clay, aluminate cement, a water reducing agent and organic fibers according to the selected parts by weight; and pouring the weighed raw materials into a sand mixer to mix for 5-6min to obtain the low-cost environment-friendly tundish fire clay.
Example 6
The low-cost environment-friendly tundish fire clay described in the embodiment is prepared from the following raw materials in parts by mass:
23 parts of recycled aluminum-magnesia brick waste with the granularity of 0.074-0.083mm, 67.8 parts of magnesite with the granularity of 0.074-0.083mm, 4 parts of silica powder with the granularity of 3-10 mu m, 3 parts of clay with the granularity of 0.044-0.074mm, 1.8 parts of aluminate cement with the granularity of 0.04-0.09mm, 0.25 part of water reducing agent KF21 and 0.15 part of polypropylene fiber.
The components, contents and preparation methods of the raw materials in the low-cost environment-friendly tundish fire clay of the embodiment are the same as those of the embodiment 1.
Example 7
The low-cost environment-friendly tundish fire clay described in the embodiment is prepared from the following raw materials in parts by mass:
32.2 parts of recycled aluminum-magnesia brick waste with the granularity of 0.074-0.083mm, 63 parts of magnesite with the granularity of 0.074-0.083mm, 1 part of silica powder with the granularity of 3-10 mu m, 1 part of clay with the granularity of 0.044-0.074mm, 2.19 parts of aluminate cement with the granularity of 0.04-0.09mm, 0.45 part of water reducing agent KF21 and 0.16 part of polypropylene fiber.
The components, contents and preparation methods of the raw materials in the low-cost environment-friendly tundish fire clay of the embodiment are the same as those of the embodiment 1.
Example 8
The low-cost environment-friendly tundish fire clay described in the embodiment is prepared from the following raw materials in parts by mass:
30 parts of recycled aluminum-magnesia brick waste with the granularity of 0.074-0.083mm, 65.2 parts of magnesite with the granularity of 0.074-0.083mm, 1.8 parts of silica powder with the granularity of 3-10 mu m, 0.2 part of clay with the granularity of 0.044-0.074mm, 2.27 parts of aluminate cement with the granularity of 0.04-0.09mm, 0.35 part of water reducing agent KF21 and 0.18 part of polypropylene fiber.
The components, contents and preparation methods of the raw materials in the low-cost environment-friendly tundish fire clay of the embodiment are the same as those of the embodiment 1.
Example 9
The low-cost environment-friendly tundish fire clay described in the embodiment is prepared from the following raw materials in parts by mass:
25.2 parts of recycled aluminum-magnesia brick waste with the granularity of 0.074-0.083mm, 68.5 parts of magnesite with the granularity of 0.074-0.083mm, 3.2 parts of silicon powder with the granularity of 3-10 mu m, 1.2 parts of clay with the granularity of 0.044-0.074mm, 1.22 parts of aluminate cement with the granularity of 0.04-0.09mm, 0.51 part of water reducing agent KF21 and 0.17 part of polypropylene fiber.
The components, contents and preparation methods of the raw materials in the low-cost environment-friendly tundish fire clay of the embodiment are the same as those of the embodiment 1.
Example 10
The low-cost environment-friendly tundish fire clay described in the embodiment is prepared from the following raw materials in parts by mass:
29 parts of recycled aluminum-magnesia brick waste with the granularity of 0.074-0.083mm, 63.1 parts of magnesite with the granularity of 0.074-0.083mm, 3.6 parts of silica powder with the granularity of 3-10 mu m, 2.1 parts of clay with the granularity of 0.044-0.074mm, 1.47 parts of aluminate cement with the granularity of 0.04-0.09mm, 0.54 part of water reducing agent KF21 and 0.19 part of polypropylene fiber.
The components, contents and preparation methods of the raw materials in the low-cost environment-friendly tundish fire clay of the embodiment are the same as those of the embodiment 1.
Example 11
The low-cost environment-friendly tundish fire clay described in the embodiment is prepared from the following raw materials in parts by mass:
22 parts of recycled aluminum-magnesia brick waste with the granularity of 0.074-0.083mm, 63.6 parts of magnesite with the granularity of 0.074-0.083mm, 5 parts of silica powder with the granularity of 3-10 mu m, 5 parts of clay with the granularity of 0.044-0.074mm, 3.56 parts of aluminate cement with the granularity of 0.04-0.09mm, 0.65 part of water reducing agent KF21 and 0.19 part of polypropylene fiber.
The components, contents and preparation methods of the raw materials in the low-cost environment-friendly tundish fire clay of the embodiment are the same as those of the embodiment 1.
Example 12
The low-cost environment-friendly tundish fire clay described in the embodiment is prepared from the following raw materials in parts by mass:
36 parts of recycled aluminum-magnesia brick waste with the granularity of 0.074-0.083mm, 48.9 parts of magnesite with the granularity of 0.074-0.083mm, 4.9 parts of silica powder with the granularity of 3-10 mu m, 4.9 parts of clay with the granularity of 0.044-0.074mm, 4 parts of aluminate cement with the granularity of 0.04-0.09mm, 1 part of water reducing agent KF21 and 0.3 part of polypropylene fiber.
The components, contents and preparation methods of the raw materials in the low-cost environment-friendly tundish fire clay of the embodiment are the same as those of the embodiment 1.
Example 13
The low-cost environment-friendly tundish fire clay described in the embodiment is prepared from the following raw materials in parts by mass:
38 parts of recycled aluminum-magnesia brick waste with the granularity of 0.074-0.083mm, 48.6 parts of magnesite with the granularity of 0.074-0.083mm, 4.5 parts of silica powder with the granularity of 3-10 mu m, 4.3 parts of clay with the granularity of 0.044-0.074mm, 3.4 parts of aluminate cement with the granularity of 0.04-0.09mm, 0.94 part of water reducing agent KF21 and 0.26 part of polypropylene fiber.
The components, contents and preparation methods of the raw materials in the low-cost environment-friendly tundish fire clay of the embodiment are the same as those of the embodiment 1.
Example 14
The low-cost environment-friendly tundish fire clay described in the embodiment is prepared from the following raw materials in parts by mass:
34 parts of recycled aluminum magnesia brick waste with the granularity of 0.044-0.074mm, 60.6 parts of magnesite with the granularity of 0.044-0.074mm, 2.1 parts of silica powder with the granularity of 1-3 mu m, 1.8 parts of clay with the granularity of 0.074-0.083mm, 1.2 parts of aluminate cement with the granularity of 0.01-0.04mm, 0.2 part of water reducing agent KF21 and 0.1 part of polypropylene fiber.
The components, contents and preparation methods of the raw materials in the low-cost environment-friendly tundish fire clay of the embodiment are the same as those of the embodiment 1.
Example 15
The low-cost environment-friendly tundish fire clay described in the embodiment is prepared from the following raw materials in parts by mass:
18.6 parts of recycled aluminum-magnesia brick waste with the granularity of 0.074-0.083mm, 76 parts of magnesite with the granularity of 0.074-0.083mm, 2.1 parts of silica powder with the granularity of 3-10 mu m, 1.8 parts of clay with the granularity of 0.044-0.074mm, 1.2 parts of aluminate cement with the granularity of 0.04-0.09mm, 0.2 part of water reducing agent KF21 and 0.1 part of polypropylene fiber.
The components, contents and preparation methods of the raw materials in the low-cost environment-friendly tundish fire clay of the embodiment are the same as those of the embodiment 1.
Comparative example
The tundish fire clay of the comparative example is prepared from the following raw materials in parts by mass:
64 parts of recycled aluminum-magnesia brick waste with the granularity of 0.074-0.083mm, 30 parts of magnesite with the granularity of 0.074-0.083mm, 2.1 parts of silica powder with the granularity of 3-10 mu m, 1.8 parts of clay with the granularity of 0.044-0.074mm, 1.2 parts of aluminate cement with the granularity of 0.04-0.09mm, 0.2 part of water reducing agent KF21 and 0.1 part of polypropylene fiber.
The components, contents and preparation methods of the raw materials in the low-cost environment-friendly tundish fire clay of the embodiment are the same as those of the embodiment 1.
Low-cost environment-friendly tundish fire clay performance test
The physical properties and pressure resistance of the low-cost environment-friendly tundish fire clay of each example and each comparative example were measured, and the measurement results are shown in table 1 below. As can be seen from the following Table 1, the low-cost environment-friendly tundish fire clay disclosed by the invention has good physical properties and pressure resistance. Wherein, compared with example 1, the comparative example is different from example 1 only in the mass parts of the recycled alumina magnesia brick waste and magnesite, and the tundish fire clay of the comparative example is obviously inferior to example 1 in performance because the recycled alumina magnesia brick waste is added too much to cause the performance to be poor, so the more the recycled alumina magnesia brick waste is not added, the better. Compared with the embodiment 1, the difference of the embodiment 14 is only that the particle size distribution of each raw material is different, and the tundish fire clay of the embodiment 14 has poor particle size distribution of each raw material, too high viscosity of the fire clay, inconvenient field construction and difficult smearing. Example 15 differs from example 1 only in that the ratio of recycled alumina magnesia brick waste to magnesite is different, the tundish mortar performance of example 15 is significantly inferior to example 1, indicating that the ratio of recycled alumina magnesia brick waste to magnesite has some effect on the tundish mortar performance, whereas the ratio of example 1 is the preferred value. In examples 1 to 13, the contents of the components in the low-cost environment-friendly tundish fire clay of examples 1 to 10 are in the preferred ranges, and the low-cost environment-friendly tundish fire clay is a preferred example and has better pressure resistance compared with examples 11, 12 and 13.
The low-cost environment-friendly tundish fire clay of each embodiment is used on a long-life slab tundish of a certain steel mill, when the tundish fire clay is used, clean tap water with the mass being 23% of that of the tundish fire clay is added, the mixture is uniformly stirred, the tundish is used on the long-life slab tundish, and the on-site reaction is carried out, so that the product of each embodiment except the embodiment 14 is proper in viscosity and convenient to paint, no steel seepage occurs between the fire clay and a water gap of each embodiment after 30 hours of steel pouring, and the use is very stable.
TABLE 1
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. The low-cost environment-friendly tundish fire clay is characterized by comprising the following preparation raw materials in parts by mass:
5-40 parts of recycled aluminum-magnesium brick waste, 35-80 parts of magnesite, 0.5-5 parts of silica powder, 0.1-5 parts of clay, 0-4 parts of aluminate cement, 0.1-1 part of water reducing agent and 0.1-0.3 part of organic fiber.
2. The low-cost environment-friendly tundish fire clay according to claim 1, characterized in that the preparation raw materials comprise the following components in parts by mass:
10-35 parts of recycled alumina-magnesia brick waste, 45-70 parts of magnesite, 1-4 parts of silica powder, 0.2-3 parts of clay, 0.5-3 parts of aluminate cement, 0.1-0.8 part of water reducing agent and 0.1-0.25 part of organic fiber.
3. The low-cost environment-friendly tundish fire clay according to claim 1, characterized in that:
in the preparation raw materials, the mass ratio of the regenerated alumina magnesia brick waste to the magnesite is 1: (1.125-3.5).
4. The low-cost environment-friendly tundish fire clay according to claim 1, characterized in that:
in the recycled aluminum-magnesia brick waste, Al2O3The content is more than or equal to 50wt percent, and the C content is more than or equal to 4wt percent;
in the magnesite, the content of MgO is more than or equal to 40 wt%.
5. The low-cost environment-friendly tundish fire clay according to claim 1, characterized in that:
the model of the water reducing agent is KF 21.
6. The low-cost environment-friendly tundish fire clay according to claim 1, characterized in that:
the organic fiber is polypropylene fiber with the specification of 3-6mm length, 30-60 μm diameter and 60-85 ℃ melting point.
7. The low-cost environment-friendly tundish fire clay according to claim 1, characterized in that:
the particle size of the regenerated aluminum-magnesium brick waste is 0.074-0.083 mm;
the granularity of the magnesite is 0.074-0.083 mm;
the granularity of the silicon micro powder is 3-10 mu m;
the particle size of the clay is 0.044-0.074 mm;
the granularity of the aluminate cement is 0.04-0.09 mm.
8. The low-cost environment-friendly tundish fire clay according to claim 1, characterized in that:
in the fine silicon powder, SiO2The content is more than or equal to 92 wt%;
in the clay, Al2O3The content is more than or equal to 30wt percent and SiO2Less than or equal to 55wt% of Fe2O3The content is less than or equal to 2.0wt percent;
in the aluminate cement, Al2O3The content is 66 to 74 weight percent, and the content of CaO is 25 to 30 weight percent.
9. A method for preparing the low-cost environment-friendly tundish fire clay according to any one of claims 1-8, which comprises:
mixing the recycled alumina magnesia brick waste, magnesite, silica micropowder, clay, aluminate cement, a water reducing agent and organic fiber according to the selected mass parts to obtain the low-cost environment-friendly tundish fire clay.
10. A construction method of the low-cost environment-friendly tundish fire clay according to any one of claims 1 to 8, characterized by comprising:
and mixing the low-cost environment-friendly tundish fire clay with water, stirring to obtain a construction material, and then constructing the construction material on a tundish, wherein the mass of the water is 20-24% of that of the low-cost environment-friendly tundish fire clay.
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