阅读说明：本技术 一种用废弃砖瓦制造耐火砖的方法 (Method for manufacturing refractory brick by using waste bricks and tiles ) 是由 彭勃 彭艳玲 于 2021-01-21 设计创作，主要内容包括：本发明涉及一种用废弃砖瓦制造耐火砖的方法,属于耐火砖领域,本发明通过在废砖瓦粉中加入氧化镁、硫酸铝钾和β-Al2O3,再经煅烧制得耐火砖,不仅有效利用了废砖瓦,且制备出的含铝耐火材料能适用于锰钢的耐火需求,在防火过程中不会对锰钢的性能产生影响,有效克服了目前含铝耐火材料会降低锰钢性能的技术问题,特别适用于锰钢的防火需求。(The invention relates to a method for manufacturing refractory bricks by using waste bricks and tiles, which belongs to the field of refractory bricks, and the method comprises the steps of adding magnesium oxide, aluminum potassium sulfate and beta-Al 2O3 into waste brick and tile powder, and then calcining to prepare the refractory bricks, so that the waste bricks and tiles are effectively utilized, the prepared aluminum-containing refractory material can meet the fire-resistant requirement of manganese steel, the performance of the manganese steel cannot be influenced in the fire-proof process, the technical problem that the performance of the manganese steel can be reduced by the existing aluminum-containing refractory material is effectively solved, and the method is particularly suitable for the fire-resistant requirement of the manganese steel.)

1. A method for manufacturing refractory bricks by using waste bricks and tiles is characterized in that: the method for manufacturing the refractory brick by using the waste bricks and tiles comprises the following steps:

(1) crushing the waste bricks and tiles to 400 meshes to obtain waste brick and tile powder;

(2) adding powdery magnesium oxide, aluminum potassium sulfate, SiO2 and beta-Al 2O3 into the waste brick and tile powder to obtain a waste brick and tile mixture;

(3) and (3) calcining the mixture obtained in the step (2) at a high temperature to prepare the refractory brick.

Wherein, the adding amount of the magnesium oxide in the step (2) is 3 to 15 percent of the total mass of the mixed material.

2. The method of claim 1, wherein the method comprises the steps of: the fineness of the magnesium oxide is 400-650 meshes.

3. The method of claim 1, wherein the method comprises the steps of: the aluminum potassium sulfate is anhydrous aluminum potassium sulfate, and the fineness is 200-650 meshes.

4. A method of manufacturing a refractory brick from waste tiles according to any one of claims 1 to 3, wherein: the addition amount of the SiO2 is 20-40% of the total mass of the mixed material.

5. The method of claim 1, wherein the method comprises the steps of: the calcination temperature is more than 1000 ℃.

6. The method for manufacturing a refractory brick from waste tiles as claimed in claim 4 or 5, wherein: the adding amount of the aluminum potassium sulfate is 3-10% of the total mass of the mixed materials.

7. The method of claim 6, wherein the method comprises the steps of: the mass ratio of the beta-Al 2O3 to the MgO is 1:1-1: 2.

8. The raw material for preparing the aluminum-containing refractory material is characterized by comprising magnesium oxide, aluminum potassium sulfate and beta-Al 2O 3.

Technical Field

The invention belongs to the field of refractory bricks, and particularly relates to a method for manufacturing refractory bricks by using waste bricks and tiles.

Background

Manganese steel, also known as manganese alloy steel, is a high-strength steel material, is mainly used for bearing severe working conditions such as impact, extrusion, material abrasion and the like, is mainly damaged by abrasion consumption, and has the characteristics of low melting point, strong plasticity, high hardness and the like. At present, manganese steel is also applied to some high-temperature environments, so that refractory bricks are required to be arranged on the surface of the manganese steel to ensure the normal use of the manganese steel. Aluminum and silicon are one of the common components in the prior refractory brick, and the waste brick and tile contain a large amount of components such as silicate, aluminum-containing compounds and the like, and can be used for preparing the refractory brick after being calcined. But because aluminium is comparatively lively, when being used for manganese steel fire-resistant protection, can react with manganese steel, cause manganese steel performance to change, make manganese steel's hardness reduction even, and then lead to manganese steel performance to lose, therefore the resistant firebrick that useless brick tile was made can't satisfy manganese steel's fire-resistant demand.

Disclosure of Invention

In order to overcome the problems in the background art, the invention provides a method for manufacturing refractory bricks by using waste bricks and tiles, which not only effectively utilizes the waste bricks and tiles, but also can prepare the aluminum-containing refractory material which can meet the refractory requirement of manganese steel, can not influence the performance of the manganese steel in the fireproof process, and effectively overcomes the technical problem that the performance of the manganese steel can be reduced by the aluminum-containing refractory material at present.

In order to achieve the above objects, a first object of the present invention is to provide a method for manufacturing a refractory brick from waste tiles, and a second object is to provide a raw material for producing an aluminum-containing refractory.

The first purpose of the invention is realized by the following technical scheme:

the method for manufacturing the refractory brick by using the waste bricks and tiles comprises the following steps:

(1) crushing the waste bricks and tiles to 400 meshes to obtain waste brick and tile powder;

(2) adding powdery magnesium oxide, aluminum potassium sulfate, SiO2 and beta-Al 2O3 into the waste brick and tile powder to obtain a waste brick and tile mixture;

(3) and (3) calcining the mixture obtained in the step (2) at a high temperature to prepare the refractory brick.

Wherein, the adding amount of the magnesium oxide in the step (2) is 3 to 15 percent of the total mass of the mixed material.

Furthermore, the fineness of the magnesium oxide is 400-650 meshes.

Further, the aluminum potassium sulfate is anhydrous aluminum potassium sulfate, and the fineness is 200-650 meshes.

Further, the addition amount of the SiO2 is 20-40% of the total mass of the mixed material.

Further, the calcination temperature is more than 1000 ℃.

Further, the adding amount of the aluminum potassium sulfate is 3 to 10 percent of the total mass of the mixed materials

Furthermore, the mass ratio of the beta-Al 2O3 to the MgO is 1:1-1: 2.

The second purpose of the invention is to provide a raw material for preparing the aluminum-containing refractory material containing magnesium oxide, aluminum potassium sulfate and beta-Al 2O 3.

The invention has the beneficial effects that:

according to the invention, magnesium oxide, potassium aluminum sulfate and beta-Al 2O3 are added into the waste brick and tile powder, and during the calcining process, the potassium aluminum sulfate plays a role in free dispersion, so that the materials react uniformly and stably, a stable crystal framework can be formed, and a refractory material with a lower heat conductivity coefficient is obtained; the addition of the beta-Al 2O3 can reduce the heat conductivity coefficient of the refractory material and effectively improve the refractory temperature of the manganese steel; by adding the magnesium oxide, the magnesium oxide can prevent the reaction of aluminum and manganese steel at high temperature, and the performance of the manganese steel is effectively ensured. Through repeated tests, the manganese steel prepared by the method has good performance preservation in a fire resistance test at the temperature of below 1200 ℃, and is particularly suitable for the fire resistance and fire prevention requirements of the manganese steel.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, preferred embodiments of the present invention will be described in detail below to facilitate understanding of the skilled person.

Example 1

The method for manufacturing the refractory brick by using the waste bricks and tiles comprises the following steps:

(1) crushing the waste bricks and tiles to 400 meshes to obtain waste brick and tile powder;

(2) the waste tile powder is mixed with 540-mesh magnesia, 325-mesh aluminum potassium sulfate, 325-mesh SiO2 and beta-Al 2O 3. Wherein the magnesium oxide accounts for 5 percent, the aluminum potassium sulfate accounts for 4 percent, the SiO2 accounts for 35 percent, the beta-Al 2O3 accounts for 12.8 percent, and the rest is waste brick and tile powder.

(3) And (3) putting the mixture obtained in the step (2) into a grinding tool, and calcining at 1500 ℃ to prepare the refractory brick.

Example 2

The method for manufacturing the refractory brick by using the waste bricks and tiles comprises the following steps:

(1) crushing the waste bricks and tiles to 460 meshes to obtain waste brick and tile powder;

(2) the waste tile powder is mixed with 400-mesh magnesium oxide, 325-mesh aluminum potassium sulfate, 400-mesh SiO2 and beta-Al 2O 3. Wherein the proportion of magnesium oxide is 15%, the proportion of aluminum potassium sulfate is 6%, the proportion of SiO2 is 30%, the proportion of beta-Al 2O3 is 19%, and the balance is waste brick and tile powder.

(3) And (3) putting the mixture obtained in the step (2) into a grinding tool, and calcining at 1500 ℃ to prepare the refractory brick.

Comparative example 1 (comparison with example 2, without addition of magnesium oxide)

The method for manufacturing the refractory brick by using the waste bricks and tiles comprises the following steps:

(1) crushing the waste bricks and tiles to 460 meshes to obtain waste brick and tile powder;

(2) 325 mesh aluminum potassium sulfate, 400 mesh SiO2 and beta-Al 2O3 are mixed into the waste tile powder. Wherein the proportion of aluminum potassium sulfate is 7 percent, the proportion of SiO2 is 35.3 percent, the proportion of beta-Al 2O3 is 22.3 percent, and the balance is waste brick and tile powder.

(3) And (3) putting the mixture obtained in the step (2) into a grinding tool, and calcining at 1500 ℃ to prepare the refractory brick.

Comparative example 2 (in comparison with example 2, beta-Al 2O3 was replaced with 400 mesh ordinary alumina)

The method for manufacturing the refractory brick by using the waste bricks and tiles comprises the following steps:

(1) crushing the waste bricks and tiles to 460 meshes to obtain waste brick and tile powder;

(2) the waste tile powder is mixed with 400-mesh magnesia, 325-mesh aluminum potassium sulfate, 400-mesh SiO2 and 400-mesh ordinary Al2O 3. Wherein the proportion of magnesium oxide is 15%, the proportion of aluminum potassium sulfate is 6%, the proportion of SiO2 is 30%, the proportion of Al2O3 is 19%, and the balance is waste brick and tile powder.

(3) And (3) putting the mixture obtained in the step (2) into a grinding tool, and calcining at 1500 ℃ to prepare the refractory brick.

Comparative example 3 (comparison with example 2, without potassium aluminium sulphate)

The method for manufacturing the refractory brick by using the waste bricks and tiles comprises the following steps:

(1) crushing the waste bricks and tiles to 460 meshes to obtain waste brick and tile powder;

(2) the waste tile powder is mixed with 400-mesh magnesium oxide, 400-mesh SiO2 and beta-Al 2O 3. Wherein the proportion of magnesium oxide is 16.3 percent, the proportion of SiO2 is 32.6 percent, the proportion of beta-Al 2O3 is 20.6 percent, and the balance is waste brick and tile powder.

(3) And (3) putting the mixture obtained in the step (2) into a grinding tool, and calcining at 1500 ℃ to prepare the refractory brick.

Example 3

The method for manufacturing the refractory brick by using the waste bricks and tiles comprises the following steps:

(1) crushing the waste bricks and tiles to 460 meshes to obtain waste brick and tile powder;

(2) 460 mesh magnesium oxide, 325 mesh aluminum potassium sulfate, 400 mesh SiO2 and beta-Al 2O3 are mixed into the waste tile powder. Wherein the proportion of magnesium oxide is 10%, the proportion of aluminum potassium sulfate is 10%, the proportion of SiO2 is 40%, the proportion of beta-Al 2O3 is 17%, and the balance is waste brick and tile powder.

(3) And (3) putting the mixture obtained in the step (2) into a grinding tool, and calcining at 1500 ℃ to prepare the refractory brick.

Comparative example 4 (comparison with example 3, without addition of magnesium oxide)

The method for manufacturing the refractory brick by using the waste bricks and tiles comprises the following steps:

(1) crushing the waste bricks and tiles to 460 meshes to obtain waste brick and tile powder;

(2) 325 mesh aluminum potassium sulfate, 400 mesh SiO2 and beta-Al 2O3 are mixed into the waste tile powder. Wherein the proportion of aluminum potassium sulfate is 11.1 percent, the proportion of SiO2 is 44.4 percent, the proportion of beta-Al 2O3 is 18.9 percent, and the balance is waste brick and tile powder.

(3) And (3) putting the mixture obtained in the step (2) into a grinding tool, and calcining at 1500 ℃ to prepare the refractory brick.

TABLE 1 physical Properties of refractory bricks obtained in examples and comparative examples

The refractory brick prepared without magnesium oxide has slightly reduced refractory performance; using ordinary alumina instead of beta

The physical properties of the refractory brick prepared from the-Al 2O3 are obviously reduced, which may be a layered structure of beta-Al 2O3 and an aluminum oxy spinel substrate structure contained in a unit cell thereof, and the refractory brick is easier to combine with other substances during calcination, so that a crystal structure with more stable performance is formed, the apparent porosity is lower, and the flexural strength is higher; by adding the aluminum potassium sulfate, the aluminum potassium sulfate plays a role in free dispersion in the calcining process, so that the material reaction is uniform and stable, a stable crystal framework can be formed, and the refractory material with lower heat conductivity coefficient is obtained.

Refractory application test in high manganese steel:

the refractory bricks obtained in the above examples and comparative examples were used in a high manganese steel refractory test to examine the influence thereof on the refractory properties of high manganese steel. Specifically, the high manganese steel is wrapped by refractory bricks, placed in a high-temperature calcining furnace at 1200 ℃, calcined for 1.5 hours, taken out, the refractory bricks wrapped on the outer layer are removed, and the performance of the high manganese steel is tested, and the test results are shown in table 2. The high manganese steel before calcination has a hardness of 235HB, a tensile strength of 769MPa and an impact toughness of 168J/cm²。

TABLE 2 physical properties of manganese steels after refractory calcination of refractory bricks for 1.5 hours

The physical properties of the high manganese steel are slightly reduced by carrying out a fire resistance test on the high manganese steel on the refractory brick prepared by replacing beta-Al 2O3 with common alumina; the physical properties of the high manganese steel are basically unchanged by carrying out a fire resistance test on the high manganese steel by using the refractory brick prepared without adding potassium aluminum sulfate; the physical properties of the high manganese steel are greatly reduced by carrying out a fire resistance test on the high manganese steel by using the refractory brick prepared without adding magnesium oxide. This is mainly due to the fact that aluminum in the refractory bricks reacts with manganese in the manganese steel without adding magnesium oxide, which results in a change in the composition of the high manganese steel and further affects its physical properties.

When the invention is not specially explained, the percentage contents all refer to mass percentage contents.

Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.