CN119977609A - A castable material resistant to aluminum liquid corrosion and its preparation method and application - Google Patents

Abstract

The invention belongs to the technical field of unshaped refractory new materials, and particularly relates to an aluminum liquid corrosion resistant castable, a preparation method and application thereof. The aluminum liquid corrosion resistant castable is prepared from, by weight, 64-80 parts of fused quartz particles, 4-8 parts of fused quartz micro powder, 4-8 parts of magnesia-alumina spinel micro powder, 5-10 parts of alpha-alumina micro powder, 3-10 parts of calcium aluminate cement, 4-12 parts of a composite aluminum liquid wetting agent, 0.1-1 part of a water reducer and 4-10 parts of water, wherein the composite aluminum liquid wetting agent is formed by compounding BaAl ₂O₄、BaTiO₃ and V ₂O₅. The casting material for resisting the molten aluminum corrosion has excellent molten aluminum corrosion resistance and permeability, and has the advantages of good thermal shock resistance, low heat conductivity, high temperature resistance and high strength, and the service life of casting material products is prolonged.

Description

Aluminum liquid corrosion resistant castable and preparation method and application thereof

Technical Field

The invention belongs to the technical field of new materials, and particularly relates to an aluminum liquid corrosion resistant castable, a preparation method and application thereof.

Background

The aluminum alloy has stable performance, rust resistance and good ductility, is widely applied to the fields of aircraft manufacturing, building industry, equipment manufacturing, shipbuilding industry, automobiles, railways and the like, and the demand of the aluminum alloy is rapidly increased along with the wider and wider application of industrial departments. Meanwhile, the requirements for high-quality aluminum alloy are higher and higher, so that the alloy components and impurities in aluminum smelting are controlled more strictly, the use conditions of the refractory material are more severe, and particularly, the aluminum corrosion behavior of the refractory material is improved at the contact part with molten aluminum. The aluminum liquid contains magnesium, silicon, zinc and other elements with high chemical activity, the fluidity of the molten liquid is excellent, the viscosity of the aluminum molten liquid at 750 ℃ is only 0.104 Pa.s, the viscosity of the aluminum molten liquid is quite similar to the viscosity of water at 20 ℃ (0.1 Pa.s), the aluminum liquid has good wettability to the refractory material, the aluminum liquid is easy to permeate into the refractory material through air holes, and the aluminum molten liquid is easy to permeate into a furnace lining, so that the refractory material is damaged. It is therefore desirable that the refractory material contacted by the molten aluminum should have good resistance to wetting by the molten aluminum.

The aluminum alloy smelting production needs an electrolytic tank, an aluminum flowing tank, a transportation container, a mixing furnace, a smelting furnace and the like. The working layer of the electrolytic tank mainly adopts a bottom cathode carbon block and a side wall silicon carbide brick. The aluminum flowing tank generally adopts Al ₂O₃-SiO₂ series low-cement casting materials or fused quartz low-cement casting materials. The aluminum-silicon refractory material and the fused quartz have low heat conductivity coefficient and low thermal expansion coefficient, improve the volume stability of the aluminum flowing groove, simultaneously reduce heat loss, fully utilize waste heat, reduce comprehensive energy consumption, be favorable for implementing the national significant strategy of energy conservation and emission reduction, greatly improve the thermal shock resistance of the product, prolong the service life and reduce the use cost. However, molten aluminum and alloy elements are easy to wet and react with the aluminum-silicon refractory material and the molten quartz at high temperature, so that the refractory material is invalid, the service life of the refractory material is reduced, and the aluminum alloy components are also influenced. During research, the content of free silicon dioxide in the refractory material needs to be controlled, and a non-wetting agent is added to improve the wettability of the refractory material against aluminum liquid.

The Chinese patent application CN 106673672B discloses a composition for preparing an aluminum water launder, the aluminum water launder and a preparation method thereof, and particularly provides a composition for preparing the aluminum water launder, wherein one or more of fused quartz particles, fused corundum particles and fused mullite particles are selected, a large amount of fly ash is used as a filling material, and a large amount of free silicon dioxide is introduced, so that the erosion resistance of the aluminum water launder is reduced. The Chinese patent with the application number of CN 101734928B discloses a preparation method of a fused quartz refractory castable which is not wetted by aluminum liquid, and takes fused quartz as a main material, however, the activity of magnesium in aluminum alloy is extremely high, and when high-magnesium aluminum alloy is smelted, magnesium is extremely easy to permeate into the refractory, and reacts with alumina and silicon dioxide to cause the castable to lose efficacy. The anti-wetting agent BaSO ₄ can decompose and release sulfur dioxide toxic and harmful gas during heat treatment and use at high temperature, and pollute the environment. The Chinese patent with the application number of CN 117383912B discloses a casting material which is not stained with aluminum and a preparation method thereof, and is prepared from high-alumina aggregate, wherein the high-alumina aggregate has higher thermal expansion coefficient, and the prepared casting material product is easy to generate thermal shock cracking phenomenon, so that the service life of the casting material product is reduced. Therefore, there is a need to develop a castable with good aluminum corrosion resistance.

Disclosure of Invention

Aiming at the problems and the defects existing in the prior art, the invention aims at providing an aluminum liquid corrosion resistant castable as well as a preparation method and application thereof.

In order to achieve the aim of the invention, the technical scheme adopted by the invention is as follows:

The invention provides an aluminum liquid corrosion resistant castable which is prepared from, by weight, 64-80 parts of fused quartz particles, 4-8 parts of fused quartz micro powder, 4-8 parts of magnesia-alumina spinel micro powder, 5-10 parts of alpha-alumina micro powder, 3-10 parts of calcium aluminate cement, 4-12 parts of a composite aluminum liquid wetting agent, 0.1-1 part of a water reducer and 4-10 parts of water, wherein the composite aluminum liquid wetting agent is formed by compounding BaAl ₂O₄ (barium aluminate), baTiO ₃ (barium titanate) and V ₂O₅ (vanadium pentoxide).

The aluminum liquid corrosion resistant castable is preferably prepared from the following raw materials, by weight, 74 parts of fused quartz particles, 6 parts of fused quartz micro powder, 4 parts of magnesium aluminate spinel micro powder, 8 parts of alpha-alumina micro powder, 8 parts of calcium aluminate cement, 8 parts of a composite aluminum liquid wetting agent, 0.6 part of a water reducer and 7 parts of water, wherein the composite aluminum liquid corrosion resistant wetting agent is formed by compounding BaAl ₂O₄ (barium aluminate), baTiO ₃ (barium titanate) and V ₂O₅ (vanadium pentoxide).

According to the aluminum liquid corrosion resistant castable, preferably, the mass ratio of BaAl ₂O₄、BaTiO₃ to V ₂O₅ in the composite aluminum liquid wetting agent is (2-5) (1-5).

According to the aluminum liquid corrosion resistant castable, preferably, the mass ratio of BaAl ₂O₄、BaTiO₃ to V ₂O₅ in the composite aluminum liquid corrosion resistant wetting agent is 2:1:1.

According to the casting material for resisting the molten aluminum corrosion, preferably, the water reducing agent is sodium tripolyphosphate or/and sodium hexametaphosphate, and more preferably, the water reducing agent is sodium hexametaphosphate high-efficiency water reducing agent.

According to the casting material for resisting molten aluminum corrosion, preferably, the cement is calcium aluminate cement, and more preferably, the cement is Secar-71 cement.

According to the aluminum liquid corrosion resistant castable, preferably, the granularity of the fused quartz particles is 0-8 mm, the granularity of the composite aluminum liquid wetting agent is less than or equal to 0.075mm, the granularity of the fused quartz micro powder is 200 meshes, the granularity of the magnesia-alumina spinel micro powder is 325 meshes, and the granularity of the alpha-alumina micro powder is 325 meshes.

According to a second aspect of the invention, the use of the casting material for resisting molten aluminum corrosion in the preparation of casting material products for resisting molten aluminum corrosion is provided.

According to the application, preferably, the casting material product resistant to molten aluminum corrosion is smelting equipment or/and a molten aluminum container required by aluminum alloy smelting production, and the casting material product comprises an aluminum flowing groove, a conveying container, a filtering box and the like.

The third aspect of the invention provides a method for preparing a casting material product resistant to molten aluminum corrosion, comprising the following steps:

(1) Weighing the raw materials according to the raw material composition of the casting material resistant to molten aluminum corrosion in the first aspect, and uniformly mixing fused quartz particles, fused quartz micro powder, magnesium aluminum spinel micro powder, alpha-alumina micro powder, calcium aluminate cement, a composite molten aluminum wetting agent and a water reducing agent to obtain a mixture;

(2) Adding water into the mixture prepared in the step (1), and uniformly stirring and mixing to obtain a wet-mixed castable;

(3) And (3) carrying out casting molding, curing and demolding, drying and calcining treatment on the wet mixed castable prepared in the step (2) to obtain the castable product resistant to molten aluminum corrosion.

According to the preparation method, preferably, in the step (3), the calcination temperature is 800-1200 ℃ and the calcination time is 2-4 hours.

According to the preparation method, in the step (3), preferably, the temperature rising rate is 2-8 ℃ per min during the calcination treatment.

Compared with the prior art, the invention has the following positive and beneficial effects:

(1) According to the invention, baAl ₂O₄、BaTiO₃ and V ₂O₅ are compounded to be used as an anti-aluminum liquid wetting agent for the first time, baAl ₂O₄ in the anti-aluminum liquid wetting agent can capture free SiO ₂ of the castable, the non-aluminum liquid wetting and anti-erosion performance of the castable are improved, baTiO ₃ can further promote BaAl ₂O₄ to capture free SiO ₂ and improve the anti-aluminum erosion effect, V ₂O₅ (melting point 681 ℃) in the anti-aluminum liquid wetting agent easily forms a glass phase at high temperature, can block pores, reduces porosity, and in addition, V ₂O₅ is reduced to form vanadium to form intermetallic alloy (V-Al-Si-Mg) which forms an interface physical barrier to further block aluminum liquid penetration, so that the anti-aluminum erosion and anti-erosion performance of the refractory material can be effectively improved by adopting BaAl ₂O₄、BaTiO₃ and V ₂O₅ compounded as the anti-aluminum liquid wetting agent.

(2) In the traditional casting material production method, forced stirring and dispersing agents are not enough to effectively and uniformly disperse the aluminum liquid resistant wetting agent in the casting material matrix, the BaAl ₂O₄ in the aluminum liquid resistant wetting agent has cement hydration characteristics, and hydration products can be fully dispersed in the casting material after hydration, so that a small amount of aluminum liquid resistant wetting agent is fully homogenized in the casting material matrix, and the aim that the whole casting material matrix is not wetted by aluminum liquid is fulfilled.

(3) According to the invention, the magnesia-alumina spinel micropowder is added in the castable formula, so that the wettability between the aluminum-magnesium alloy liquid and the castable can be reduced, the magnesium erosion resistance of the castable is improved, and compared with the method of directly doping magnesia, the thermal shock stability of the prepared aluminum-liquid erosion resistant castable product (such as an aluminum flowing groove) can be improved, and the castable is more suitable for the production of aluminum-magnesium aluminum alloy.

(4) The castable product (such as a casting aluminum groove and the like) prepared by adopting the aluminum liquid corrosion resistant castable has excellent aluminum liquid corrosion resistance and permeability, particularly remarkable aluminum magnesium alloy liquid corrosion resistance, good thermal shock resistance, low heat conductivity coefficient, high temperature resistance and high strength, and the service life of the castable product is prolonged.

Drawings

FIG. 1 is a photograph of a crucible sample prepared using the castable of comparative example 1-1 cut along the crucible axis;

FIG. 2 is a photograph of a crucible sample prepared using the castable of comparative example 1-2 after being cut along the crucible axis;

FIG. 3 is a photograph of a crucible specimen prepared using the castable described in example 1-1 after being cut along the crucible axis.

Detailed Description

In order to enable those skilled in the art to more clearly understand the technical scheme of the present invention, the technical scheme of the present invention will be described in detail with reference to specific embodiments.

The following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. When the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, components, and/or groups thereof.

The experimental methods without specific conditions noted in the following examples are conventional in the art or according to the conditions suggested by the manufacturer, and the reagents or instruments used are conventional products available commercially without the manufacturer's attention.

Example 1 type of aluminum liquid-resistant wetting agent

In order to study the influence of the type of the aluminum liquid wetting agent on the performance of the prepared aluminum liquid corrosion resistant castable, examples 1-1 and comparative examples 1-1 to 1-7 are carried out. Specific contents of examples 1-1 and comparative examples 1-1 to comparative examples 1-7 are as follows:

Example 1-1:

The aluminum liquid corrosion resistant castable is prepared from 74 parts of fused quartz particles with the granularity of 0-8 mm, 6 parts of fused quartz micropowder with the granularity of 200 meshes, 4 parts of magnesia-alumina spinel micropowder with the granularity of 325 meshes, 8 parts of alpha-alumina micropowder with the granularity of 325 meshes, 8 parts of calcium aluminate cement, 0.6 part of a water reducer, 7 parts of water and an aluminum liquid wetting agent with the granularity of less than or equal to 0.075mm, wherein the aluminum liquid wetting agent is formed by compounding 4 parts of BaAl ₂O₄, 4 parts of BaTiO ₃ and 4 parts of V ₂O₅ in parts by weight, the water reducer is sodium hexametaphosphate high-efficiency water reducer, and the cement is Secar-71 cement

The preparation method of the casting material for resisting molten aluminum corrosion comprises the following steps:

(1) Weighing the raw materials according to the raw material composition of the aluminum liquid corrosion resistant castable, and uniformly mixing fused quartz particles, fused quartz micro powder, magnesium aluminum spinel micro powder, alpha-alumina micro powder, calcium aluminate cement, an aluminum liquid wetting agent and a water reducing agent to obtain a mixture;

(2) Adding water into the mixture prepared in the step (1), and stirring for 2-3min to uniformly mix to obtain wet mixed castable;

(3) Adding the wet mixed castable prepared in the step (2) into a sample mold fixed on a vibrating table, vibrating and molding, curing for 24 hours at the humidity of not less than 90% and the temperature of 25+/-1 ℃, demolding to obtain a green body sample, drying for 24 hours at 110 ℃, and then heating to 1200 ℃ in a high-temperature furnace at the heating rate of 5 ℃ per min for heat preservation and calcination for 3 hours.

The contents of comparative examples 1-1 to 1-7 are basically the same as those of the embodiment 1-1, and the difference is that the aluminum liquid corrosion resistant wetting agent is adopted, the formula compositions of the aluminum liquid corrosion resistant castable materials described in the embodiment 1-1 and the comparative examples 1-1 to 1-7 are shown in the table 1, and the preparation method of the aluminum liquid corrosion resistant castable materials described in the comparative examples 1-1 to 1-7 is the same as that of the embodiment 1-1.

TABLE 1 comparative examples 1-1 to comparative examples 1-7 and example 1-1 castable sample formulations

Performance measurements were performed on the aluminum liquid corrosion resistant castable samples described in examples 1-1 and comparative examples 1-1 to comparative examples 1-7. The method comprises the steps of measuring apparent porosity and volume density of a sample subjected to heat treatment for 1200 ℃ multiplied by 3h according to national standard GB/T2999-2002, carrying out normal-temperature flexural strength test of the sample subjected to heat treatment for 1200 ℃ multiplied by 3h according to national standard GB/T3001-2007, vertically applying load to the sample until the sample breaks, carrying out normal-temperature compressive strength test of the sample subjected to heat treatment for 1200 ℃ multiplied by 3h according to national standard GB/T5072-2008, and continuously and uniformly loading the sample on a compression testing machine until the sample is broken. Aluminum erosion resistance test was conducted by referring to the slag resistance test method of the refractory material of GB/T8931-2007 by a static crucible method, namely, pouring the pouring wet-mixed material prepared by the method into a stainless steel mold of a self-made crucible (the edge length, bottom diameter and upper diameter of the crucible are respectively 70, 60 and 70mm. The depth of a conical hole, the bottom diameter and upper diameter are respectively 35, 35 and 40mm so as to facilitate the pouring material demoulding process), vibrating for 90 seconds, curing for 24 hours at a temperature of 25+/-1 ℃, demoulding to obtain a crucible green body sample, drying the crucible green body sample at 110 ℃ for 24 hours, then heating to 1200 ℃ in a high-temperature furnace for 3 hours, obtaining a crucible sample, placing 50g of 5083 aluminum alloy rods in the crucible sample, then heating in the furnace for 72 hours, naturally cooling, cutting along the crucible axis (wherein, cutting the aluminum erosion resistance pouring materials prepared by the pouring materials of comparative examples 1-1 and 1-2 along the crucible axis are respectively shown in FIG. 1,2, and measuring the area of the aluminum erosion resistance test material is shown in FIG. 2, and the area of the graph is measured, and the area of the erosion resistance of the sample is inferior. The results of performance tests on the casting material samples for preventing molten aluminum corrosion described in examples 1-1 and comparative examples 1-1 to comparative examples 1-7 are shown in Table 2.

TABLE 2 test results of the properties of casting materials for resisting molten aluminum corrosion prepared in examples 1-1 and comparative examples 1-1 to 1-7

As can be seen from fig. 1-3 and table 2, when no anti-aluminum wetting agent is added in the castable formulation, the erosion phenomenon of the crucible prepared by adopting the castable by the filtrate is most obvious (as shown in fig. 1), the erosion area percentage of the aluminum liquid reaches 24.8%, when BaAl ₂O₄、BaTiO₃ or V ₂O₅ is independently added in the castable formulation as the anti-aluminum wetting agent, the anti-aluminum erosion performance of the castable is improved to a certain extent, wherein when BaAl ₂O₄ is independently added, the anti-aluminum erosion effect of the castable is obviously improved (as shown in fig. 2), the erosion area percentage of the aluminum liquid is reduced from 24.8% to 6.7%, when BaTiO ₃ is independently added, the erosion area percentage of the aluminum liquid of the castable is reduced to 12.3%, and when V ₂O₅ is independently added, the erosion area percentage of the aluminum liquid is reduced to 8.2%. The aluminum corrosion resistance effect can be further improved by the composite addition of any two aluminum wetting agents in BaAl ₂O₄、BaTiO₃ or V ₂O₅, wherein when BaAl ₂O₄ and V ₂O₅ are added in a composite manner, the aluminum liquid corrosion area percentage of the castable is reduced to 3.1 percent, and when BaAl ₂O₄、BaTiO₃、V₂O₅ is added in a formula of the castable as the aluminum wetting agent, the prepared castable has the best aluminum corrosion resistance effect, the surface of a crucible prepared by adopting the castable is free of an erosion layer (shown in figure 3), and the aluminum liquid corrosion area percentage is 0 percent.

In addition, the type of the aluminum-resistant wetting agent has a certain influence on the macroscopic performance of the castable, baAl ₂O₄、V₂O₅ can improve the normal-temperature flexural strength and the normal-temperature compressive strength of the castable, and the independent addition of BaTiO ₃ can lead to the reduction of the temperature flexural strength and the normal-temperature compressive strength of the castable. According to the invention, the BaAl ₂O₄、BaTiO₃、V₂O₅ is compounded to be used as an anti-aluminum wetting agent, so that the defect of the reduction of the mechanical property of the castable caused by independently adding BaTiO ₃ can be overcome. Therefore, the aluminum-resistant wetting agent is preferably added in a compounding manner with the BaAl ₂O₄、BaTiO₃ and the V ₂O₅.

Example 2 BaAl ₂O₄ usage in anti-aluminium wetting agent:

In order to study the influence of the dosage of BaAl ₂O₄ in the aluminum liquid resistant wetting agent on the performance of the prepared aluminum liquid corrosion resistant castable, examples 2-1 to 2-4 are carried out.

The contents of examples 2-1 to 2-4 are basically the same as those of example 1-1, except that the amount of BaAl ₂O₄ in the anti-aluminum liquid wetting agent used is different. The formulation compositions of the casting materials for resisting molten aluminum corrosion in examples 2-1 to 2-4 are shown in Table 3, and the preparation method of the casting materials for resisting molten aluminum corrosion in examples 2-1 to 2-4 is the same as that in example 1-1.

TABLE 3 castable sample formulations of examples 2-1 to examples 2-4

The performance of the casting material samples for resisting molten aluminum corrosion described in examples 2-1 to 2-4 was measured, and the performance test method was the same as that of example 1, and the performance test results are shown in Table 4.

Table 4 test results of the properties of the casting materials prepared in examples 2-1 to 2-4

As shown in Table 4, when the addition amount of BaTiO ₃ and V ₂O₅ in the composite anti-aluminum liquid wetting agent is 4 parts and the addition amount of BaAl ₂O₄ is 2-5 parts, the prepared anti-aluminum corrosion castable has good anti-aluminum corrosion performance, the normal-temperature breaking strength and the normal-temperature compressive strength of the castable are improved, but the apparent porosity, the volume density and the change rate of the heating wire of the castable are not greatly changed, so that the use amount of BaAl ₂O₄ is preferably 2-5 parts, and more preferably 4 parts.

Example 3 BaTiO ₃ usage in anti-aluminum wetting agent:

in order to study the influence of the dosage of BaTiO ₃ in the aluminum liquid wetting agent on the performance of the prepared aluminum liquid corrosion resistant castable, examples 3-1 to 3-4 are carried out.

Examples 3-1 to 3-4 are basically the same as example 1-1 except that the amount of BaTiO ₃ used in the anti-aluminum liquid wetting agent is different. The formulation composition of the casting materials for resisting molten aluminum corrosion in examples 3-1 to 3-4 is shown in Table 5, and the preparation method of the casting materials for resisting molten aluminum corrosion in examples 3-1 to 3-4 is the same as that in example 1-1.

TABLE 5 castable sample formulations of examples 3-1 to 3-4

The performance of the casting material samples for resisting molten aluminum corrosion described in examples 3-1 to 3-4 was measured, and the performance test method was the same as that of example 1, and the performance test results are shown in Table 6.

TABLE 6 test results of the properties of casting materials for resisting molten aluminum corrosion prepared in examples 3-1 to 3-4

As shown in Table 6, when the addition amounts of the composite aluminum liquid wetting agents BaAl ₂O₄ and V ₂O₅ are 4 parts and the addition amount of BaTiO ₃ is 1-5 parts, the prepared aluminum erosion resistant castable has good aluminum erosion resistant performance, the castable has little change of apparent porosity and volume density, but the normal-temperature flexural strength and normal-temperature compressive strength are reduced, the change rate of the heating wire has a tendency of reducing first and then increasing with the increase of the addition amount of BaTiO ₃, and the addition amount is 2 parts. Therefore, the addition amount of BaTiO3 is preferably 1 to 3 parts, more preferably 2 parts.

Example 4 amount of V ₂O₅ in anti-aluminium wetting agent studied:

in order to study the influence of the V ₂O₅ dosage in the aluminum liquid resistant wetting agent on the performance of the prepared aluminum liquid corrosion resistant castable, examples 4-1 to 4-4 are carried out.

The contents of examples 4-1 to 4 are basically the same as those of example 1-1, except that the amount of V ₂O₅ in the anti-aluminum liquid wetting agent used is different. The formulation compositions of the casting materials for resisting molten aluminum corrosion in examples 4-1 to 4 are shown in Table 7, and the preparation method of the casting materials for resisting molten aluminum corrosion in examples 4-1 to 4 is the same as that in example 1-1.

TABLE 7 sample formulations for castable of examples 4-1 to 4-4

The performance of the casting material samples for resisting molten aluminum corrosion described in examples 4-1 to 4-5 was measured, and the performance test method was the same as that of example 1, and the performance test results are shown in Table 8.

Table 8 test results of the properties of the casting materials prepared in examples 4-1 to 4-5

As shown in Table 8, when the composite anti-aluminum liquid wetting agent BaAl ₂O₄ is added in an amount of 4 parts and the BaTiO ₃ is added in an amount of 2 parts, the prepared anti-aluminum corrosion castable has good anti-aluminum corrosion performance when the added amount of V ₂O₅ is 1-5 parts, the change of apparent porosity and volume density of the castable is not great, the change rate of a heating wire is reduced with the increase of the added amount of V ₂O₅, and the anti-folding and compressive strength are improved, therefore, the added amount of V ₂O₅ is preferably 1-5 parts, the use cost is reduced, the use performance of the castable is ensured, the added amount of BaAl ₂O₄ is more preferably 4, the added amount of BaTiO ₃ is 2, and the added amount of V ₂O₅ is 2 parts.

Example 4 discussion of the Effect of calcination temperature during castable preparation

In order to study the influence of the calcination temperature on the performance of the prepared casting material resistant to molten aluminum corrosion, examples 5-1 to 5-4 are carried out. The specific contents of examples 5-1 to 5-4 are as follows:

Example 5-1:

The aluminum liquid corrosion resistant castable is prepared from 74 parts of fused quartz particles with the granularity of 0-8 mm, 6 parts of fused quartz micropowder with the granularity of 200 meshes, 4 parts of magnesia-alumina spinel micropowder with the granularity of 325 meshes, 8 parts of alpha-alumina micropowder with the granularity of 325 meshes, 8 parts of calcium aluminate cement, 0.6 part of a water reducer, 7 parts of water and 8 parts of an aluminum liquid wetting agent with the granularity of less than or equal to 0.075mm, wherein the aluminum liquid wetting agent is formed by compounding BaAl ₂O₄、BaTiO₃ and V ₂O₅, the mass ratio of BaAl ₂O₄、BaTiO₃ to V ₂O₅ in the aluminum liquid wetting agent is 2:1:1, the water reducer is sodium hexametaphosphate high-efficiency water reducer, and the cement is Secar-71 cement.

The preparation method of the casting material for resisting molten aluminum corrosion comprises the following steps:

(1) Weighing the raw materials according to the raw material composition of the aluminum liquid corrosion resistant castable, and uniformly mixing fused quartz particles, fused quartz micro powder, magnesium aluminum spinel micro powder, alpha-alumina micro powder, calcium aluminate cement, an aluminum liquid wetting agent and a water reducing agent to obtain a mixture;

(2) Adding water into the mixture prepared in the step (1), and stirring for 2-3min to uniformly mix to obtain wet mixed castable;

(3) Adding the wet mixed castable prepared in the step (2) into a sample mold fixed on a vibrating table, vibrating and molding, curing for 24 hours at the humidity of not less than 90% and the temperature of 25+/-1 ℃, demolding to obtain a green body sample, drying for 24 hours at 110 ℃, and then heating to 800 ℃ in a high-temperature furnace at the heating rate of 5 ℃ per min for heat preservation and calcination for 3 hours.

Examples 5-2 to 5-4 are basically the same as example 5-1, except that the temperature of the calcination treatment is different in step (3) of the castable preparation method. In the step (3) of the castable preparation method described in examples 5-2 to 5-4, the temperature of the calcination treatment was classified into 900 ℃, 1000 ℃, 1100 ℃ and 1200 ℃.

The performance of the casting material samples for preventing molten aluminum corrosion described in examples 5-1 to 5-4 was measured, and the performance test method was the same as that of example 1, and the performance test results are shown in Table 9.

Table 9 test results of the properties of the casting materials prepared in examples 5-1 to 5-4

As shown in Table 9, when the calcination temperature is increased from 800 ℃ to 1200 ℃, the apparent porosity of the prepared castable is gradually reduced, and the normal-temperature flexural strength and the normal-temperature compressive strength are both improved, wherein when the calcination temperature is 900 ℃ to 1200 ℃, the aluminum corrosion resistance of the aluminum corrosion resistant castable is good, and the corrosion penetration phenomenon is avoided, so that the calcination treatment temperature is preferably 900 ℃ to 1200 ℃, the use production cost is reduced, the use performance of the castable is ensured, and the heat treatment temperature is more preferably 900 ℃.

Example 6:

The aluminum liquid corrosion resistant castable is prepared from the following raw materials, by weight, 70 parts of fused quartz particles with the granularity of 0-8 mm, 6 parts of fused quartz micro powder with the granularity of 200 meshes, 8 parts of magnesia-alumina micro powder with the granularity of 325 meshes, 8 parts of alpha-alumina micro powder with the granularity of 325 meshes, 8 parts of calcium aluminate cement, 0.5 part of a water reducer, 5 parts of water and 8 parts of an aluminum liquid wetting agent with the granularity of less than or equal to 0.075mm, wherein the aluminum liquid wetting agent is formed by compounding BaAl ₂O₄、BaTiO₃ and V ₂O₅, the mass ratio of BaAl ₂O₄、BaTiO₃ to V ₂O₅ in the aluminum liquid wetting agent is 2:1:1, the water reducer is sodium hexametaphosphate high-efficiency water reducer, and the cement is Secar-71 cement.

The preparation method of the casting material for resisting molten aluminum corrosion is the same as that of the embodiment 1-1.

Example 7:

The aluminum liquid corrosion resistant castable is prepared from the following raw materials, by weight, 70 parts of fused quartz particles with the granularity of 0-8 mm, 5 parts of fused quartz micro powder with the granularity of 200 meshes, 6 parts of magnesia-alumina spinel micro powder with the granularity of 325 meshes, 7 parts of alpha-alumina micro powder with the granularity of 325 meshes, 3 parts of calcium aluminate cement, 0.5 part of a water reducer, 5 parts of water and 8 parts of an aluminum liquid wetting agent with the granularity of less than or equal to 0.075mm, wherein the aluminum liquid wetting agent is formed by compounding BaAl ₂O₄、BaTiO₃ and V ₂O₅, the mass ratio of BaAl ₂O₄、BaTiO₃ to V ₂O₅ in the aluminum liquid wetting agent is 2:1:1, the water reducer is sodium hexametaphosphate high-efficiency water reducer, and the cement is Secar-71 cement.

The preparation method of the casting material for resisting molten aluminum corrosion is the same as that of the embodiment 1-1.

Example 8:

the aluminum liquid corrosion resistant castable is prepared from 64 parts of fused quartz particles with the granularity of 0-8 mm, 8 parts of fused quartz micro powder with the granularity of 200 meshes, 8 parts of magnesia-alumina spinel micro powder with the granularity of 325 meshes, 10 parts of alpha-alumina micro powder with the granularity of 325 meshes, 10 parts of calcium aluminate cement, 0.8 part of a water reducer, 8 parts of water and 8 parts of an aluminum liquid wetting agent with the granularity of less than or equal to 0.075mm, wherein the aluminum liquid wetting agent is formed by compounding BaAl ₂O₄、BaTiO₃ and V ₂O₅, the mass ratio of BaAl ₂O₄、BaTiO₃ to V ₂O₅ in the aluminum liquid wetting agent is 2:1:1, the water reducer is sodium hexametaphosphate high-efficiency water reducer, and the cement is Secar-71 cement.

The preparation method of the casting material for resisting molten aluminum corrosion is the same as that of the embodiment 1-1.

Example 9:

The aluminum liquid corrosion resistant castable is prepared from the following raw materials, by weight, 80 parts of fused quartz particles with the granularity of 0-8 mm, 4 parts of fused quartz micro powder with the granularity of 200 meshes, 6 parts of magnesia-alumina spinel micro powder with the granularity of 325 meshes, 5 parts of alpha-alumina micro powder with the granularity of 325 meshes, 5 parts of calcium aluminate cement, 0.1 part of a water reducer, 4 parts of water and 8 parts of an aluminum liquid wetting agent with the granularity of less than or equal to 0.075mm, wherein the aluminum liquid wetting agent is formed by compounding BaAl ₂O₄、BaTiO₃ and V ₂O₅, the mass ratio of BaAl ₂O₄、BaTiO₃ to V ₂O₅ in the aluminum liquid wetting agent is 2:1:1, the water reducer is sodium hexametaphosphate high-efficiency water reducer, and the cement is Secar-71 cement.

The preparation method of the casting material for resisting molten aluminum corrosion is the same as that of the embodiment 1-1.

Example 10:

The aluminum liquid corrosion resistant castable is prepared from 76 parts of fused quartz particles with the granularity of 0-8 mm, 6 parts of fused quartz micro powder with the granularity of 200 meshes, 4 parts of magnesia-alumina spinel micro powder with the granularity of 325 meshes, 6 parts of alpha-alumina micro powder with the granularity of 325 meshes, 8 parts of calcium aluminate cement, 1 part of a water reducer, 10 parts of water and 8 parts of an aluminum liquid wetting agent with the granularity of less than or equal to 0.075mm, wherein the aluminum liquid wetting agent is formed by compounding BaAl ₂O₄、BaTiO₃ and V ₂O₅, the mass ratio of BaAl ₂O₄、BaTiO₃ to V ₂O₅ in the aluminum liquid wetting agent is 2:1:1, the water reducer is sodium hexametaphosphate high-efficiency water reducer, and the cement is Secar-71 cement.

The preparation method of the casting material for resisting molten aluminum corrosion is the same as that of the embodiment 1-1.

Finally, it should be noted that the above-mentioned embodiments illustrate rather than limit the invention in any way, and that any person skilled in the art may make modifications or alterations to the above-mentioned embodiments using the teachings of the present invention. Equivalent embodiments of this equivalent variation. However, all the simple modifications, equivalent changes and modifications made to the above embodiments according to the technical substance of the present invention, which do not depart from the technical idea of the present invention, still fall within the scope of the appended claims.

Claims (10)

1. The aluminum liquid corrosion resistant castable is characterized by being prepared from, by weight, 64-80 parts of fused quartz particles, 4-8 parts of fused quartz micro powder, 4-8 parts of magnesia-alumina spinel micro powder, 5-10 parts of alpha-alumina micro powder, 3-10 parts of calcium aluminate cement, 4-12 parts of a composite aluminum liquid wetting agent, 0.1-1 part of a water reducer and 4-10 parts of water, wherein the composite aluminum liquid wetting agent is formed by compounding BaAl ₂O₄、BaTiO₃ and V ₂O₅.

2. The aluminum liquid corrosion resistant castable according to claim 1, wherein the mass ratio of BaAl ₂O₄、BaTiO₃ to V ₂O₅ in the composite aluminum liquid wetting agent is (2-5): 1-5.

3. The aluminum liquid corrosion resistant castable according to claim 2, wherein the mass ratio of BaAl ₂O₄、BaTiO₃ to V ₂O₅ in the composite aluminum liquid wetting agent is 2:1:1.

4. The aluminum liquid corrosion resistant castable according to any one of claims 1-3, wherein the water reducing agent is sodium tripolyphosphate or/and sodium hexametaphosphate.

5. The aluminum liquid corrosion resistant castable according to claim 4, wherein the cement is calcium aluminate cement.

6. The aluminum liquid corrosion resistant castable according to claim 5, wherein the granularity of the fused quartz particles is 0-8 mm, the granularity of the composite aluminum liquid wetting agent is less than or equal to 0.075mm, the granularity of the fused quartz micro powder is 200 meshes, the granularity of the magnesia-alumina spinel micro powder is 325 meshes, and the granularity of the alpha-alumina micro powder is 325 meshes.

7. The use of the casting material for resisting molten aluminum corrosion according to any one of claims 1 to 6 for preparing casting material products for resisting molten aluminum corrosion.

8. The preparation method of the casting material product resistant to molten aluminum corrosion is characterized by comprising the following steps of:

(1) Weighing the raw materials of the casting material for resisting the aluminum liquid corrosion according to the raw material composition of any one of claims 1-6, and uniformly mixing fused quartz particles, fused quartz micro powder, magnesium aluminum spinel micro powder, alpha-alumina micro powder, calcium aluminate cement, a composite aluminum liquid wetting agent and a water reducing agent to obtain a mixture;

(2) Adding water into the mixture prepared in the step (1), and uniformly stirring and mixing to obtain a wet-mixed castable;

(3) And (3) carrying out casting molding, curing and demolding, drying and calcining treatment on the wet mixed castable prepared in the step (2) to obtain the castable product resistant to molten aluminum corrosion.

9. The method according to claim 8, wherein in the step (3), the calcination temperature is 800-1200 ℃ and the calcination time is 2-4 hours.

10. The preparation method according to claim 9, wherein the temperature rising rate is 2-8 ℃ per minute during the calcination treatment.