CN111807821A - High-strength wear-resistant refractory brick and preparation method thereof - Google Patents
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Abstract
The invention provides a high-strength wear-resistant refractory brick and a preparation method thereof. The high-strength wear-resistant refractory brick is prepared from secondary high-aluminum particle aggregates, sub-white corundum particles, electric ceramic powder, raw aluminum powder and a binding agent. The preparation method comprises the following steps: (1) crushing and screening second-grade high-aluminum and sub-white corundum; (2) mixing the electroceramic particles with the green aluminum powder, and grinding into co-ground powder; (3) the co-milled powder is mixed with secondary grade high-alumina and sub-white corundum particles to prepare a mixture; (4) mixing the mixture with a binding agent to prepare a mixed material; (5) pressing the mixed material into green bricks; (6) and (4) drying the green brick, putting the green brick into a kiln, and sintering at 1450 ℃ to obtain a finished product. Compared with the traditional refractory product, the strength and the wear resistance of the high-strength wear-resistant refractory brick are greatly improved, and the high-strength wear-resistant refractory brick is very suitable for being used in parts with serious scouring and wearing of kilns such as circulating fluidized bed boilers, fluidized beds and the like.
Description
Technical Field
The invention relates to the technical field of refractory materials, in particular to a high-strength wear-resistant refractory brick and a preparation method thereof.
Background
With the popularization and application of industrial furnaces such as circulating fluidized bed boilers, fluidized bed furnaces and the like, very strict requirements are put forward on the wear resistance of refractory materials. The traditional refractory materials, such as clay bricks, common high-alumina bricks and the like, can not meet the requirements of circulating fluidized bed boilers and fluidized bed boilers.
Disclosure of Invention
The invention aims to provide a high-strength wear-resistant refractory brick which has good wear resistance, can meet the requirements of rapid popularization and large-scale of a circulating fluidized bed boiler and prolongs the service life of a refractory lining.
In order to realize the purpose, the technical scheme adopted by the high-strength wear-resistant refractory brick is as follows: the high-strength wear-resistant refractory brick is prepared from the following raw materials in percentage by weight: 38-42% of secondary grade high-aluminum particle aggregate, 8-12% of sub-white corundum particles, 8-12% of electric porcelain powder, 18-22% of raw aluminum powder and 8-12% of a binding agent.
Preferably, the strength wear-resistant refractory brick is prepared from the following raw materials in percentage by weight: 40% of secondary grade high-aluminum particle aggregate, 10% of sub-white corundum particles, 10% of electroceramic powder, 20% of raw aluminum powder and 10% of binding agent.
Preferably, the particle size of the secondary grade high-aluminum particle aggregate is 1-3 mm; the grain diameter of the sub-white corundum grains is less than or equal to 1 mm; the particle size of the electric porcelain particles is less than or equal to 1mm, and the particle size of the electric porcelain powder is less than 0.1 mm; the particle size of the raw aluminum powder is less than 0.1 mm.
Preferably, the binding agent is one or more of binding cement, phosphoric acid and aluminum phosphate.
The preparation method of the high-strength wear-resistant refractory brick comprises the following steps:
(1) crushing a secondary grade high-aluminum raw material, and screening into particles with the particle size of 1-3 mm; after crushing, screening the sub-white corundum into particles with the particle size of less than or equal to 1 mm; after the electroceramic is crushed, screening the electroceramic into particles with the particle size of less than or equal to 1 mm;
(2) selecting the electroceramic particles in percentage by weight, mixing the electroceramic particles with the raw aluminum powder in percentage by weight, and grinding the electroceramic particles into co-ground powder with the particle size less than 0.1 mm;
(3) selecting the secondary high-aluminum particles, the sub-white corundum particles and the electroceramic particles obtained in the step (1) according to the weight percentage, and mixing the secondary high-aluminum particles, the sub-white corundum particles and the electroceramic particles with the co-ground powder ground in the step (2) to prepare a mixture;
(4) adding the bonding agent with the weight percentage into the mixture prepared in the step (3) for mixing to prepare a mixed material;
(5) pressing the mixed material prepared in the step (4) into green bricks by adopting a numerical control brick press;
(6) and (4) drying the green brick prepared in the step (5), loading into a kiln, and sintering at 1450 ℃ to obtain a finished product.
The invention has the beneficial effects that: compared with a transmission refractory product, the high-strength wear-resistant refractory brick has the advantages that the strength and the wear resistance are greatly improved compared with those of the traditional refractory product, the compression strength reaches 150-300 MPa through detection, and the normal-temperature wear resistance reaches 1.5-3.5 cm3It is very suitable for the parts of the circulating fluidized bed boiler, the fluidized bed furnace and the like which are gathered and washed and abraded seriously.
Detailed Description
The present invention will be further described with reference to the following specific examples.
Example 1:
the high-strength wear-resistant refractory brick is characterized by being prepared from the following raw materials in percentage by weight: 40% of secondary grade high-aluminum particle aggregate, 10% of sub-white corundum particles, 10% of electroceramic powder, 20% of raw aluminum powder and 10% of binding agent.
In the embodiment, the particle size of the secondary grade high-aluminum particle aggregate is 1-3 mm; the grain diameter of the sub-white corundum grains is less than or equal to 1 mm; the particle size of the electric porcelain particles is less than or equal to 1mm, and the particle size of the electric porcelain powder is less than 0.1 mm; the particle size of the raw aluminum powder is less than 0.1 mm.
In this example, the binder is aluminum phosphate.
The preparation method of the high-strength wear-resistant refractory brick comprises the following steps:
1) crushing a secondary grade high-aluminum raw material, and screening into particles with the particle size of 1-3 mm; after crushing, screening the sub-white corundum into particles with the particle size of less than or equal to 1 mm; after the electroceramic is crushed, screening the electroceramic into particles with the particle size of less than or equal to 1 mm;
(2) selecting the electroceramic particles in percentage by weight, mixing the electroceramic particles with the raw aluminum powder in percentage by weight, and grinding the electroceramic particles into co-ground powder with the particle size less than 0.1 mm;
(3) selecting the secondary high-aluminum particles, the sub-white corundum particles and the electroceramic particles obtained in the step (1) according to the weight percentage, and mixing the secondary high-aluminum particles, the sub-white corundum particles and the electroceramic particles with the co-ground powder ground in the step (2) to prepare a mixture;
(4) adding the bonding agent with the weight percentage into the mixture prepared in the step (3) for mixing to prepare a mixed material;
(5) pressing the mixed material prepared in the step (4) into green bricks by adopting a numerical control brick press;
(6) and (4) drying the green brick prepared in the step (5), loading into a kiln, and sintering at 1450 ℃ to obtain a finished product.
Example 2:
the high-strength wear-resistant refractory brick is characterized by being prepared from the following raw materials in percentage by weight: 38% of secondary grade high-aluminum particle aggregate, 12% of sub-white corundum particles, 8% of electroceramic particles, 12% of electroceramic powder, 18% of raw aluminum powder and 12% of binding agent.
In the embodiment, the particle size of the secondary grade high-aluminum particle aggregate is 1-3 mm; the grain diameter of the sub-white corundum grains is less than or equal to 1 mm; the particle size of the electric porcelain particles is less than or equal to 1mm, and the particle size of the electric porcelain powder is less than 0.1 mm; the particle size of the raw aluminum powder is less than 0.1 mm.
In this example, the binder is phosphoric acid.
The method for manufacturing the high-strength wear-resistant refractory brick of this example is the same as that of example 1.
Example 3:
the high-strength wear-resistant refractory brick is characterized by being prepared from the following raw materials in percentage by weight: 42% of secondary grade high-aluminum particle aggregate, 8% of sub-white corundum particles, 12% of electroceramic particles, 8% of electroceramic powder, 22% of raw aluminum powder and 8% of bonding agent.
In the embodiment, the particle size of the secondary grade high-aluminum particle aggregate is 1-3 mm; the grain diameter of the sub-white corundum grains is less than or equal to 1 mm; the particle size of the electric porcelain particles is less than or equal to 1mm, and the particle size of the electric porcelain powder is less than 0.1 mm; the particle size of the raw aluminum powder is less than 0.1 mm.
In this embodiment, the binder is a binding cement.
The method for manufacturing the high-strength wear-resistant refractory brick of this example is the same as that of example 1.
The performance indexes of the high-strength wear-resistant refractory brick are shown in the following table:
performance index | Example 1 | Example 2 | Example 3 |
Normal temperature compressive strength (MPa) | 260 | 225 | 212 |
Bulk Density (g/cm)3) | 2.8 | 2.7 | 3.1 |
1000 ℃ Change in dead burn line (%) | -0.01 | -0.02 | -0.02 |
Wear resistance (cm) at room temperature3) | 1.8 | 2.5 | 2.9 |
In other embodiments, the binding agent may also be a mixture of any of cement, phosphoric acid, and aluminum phosphate.
Finally, it is to be noted that: although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. The high-strength wear-resistant refractory brick is characterized by being prepared from the following raw materials in percentage by weight: 38-42% of secondary grade high-aluminum particle aggregate, 8-12% of sub-white corundum particles, 8-12% of electric porcelain powder, 18-22% of raw aluminum powder and 8-12% of a binding agent.
2. The high-strength wear-resistant refractory brick as claimed in claim 1, which is prepared from the following raw materials in percentage by weight: 40% of secondary grade high-aluminum particle aggregate, 10% of sub-white corundum particles, 10% of electroceramic powder, 20% of raw aluminum powder and 10% of binding agent.
3. The high-strength wear-resistant refractory brick as claimed in claim 1 or 2, wherein the secondary grade high-alumina granular aggregate has a particle size of 1 to 3 mm; the grain diameter of the sub-white corundum grains is less than or equal to 1 mm; the particle size of the electric porcelain particles is less than or equal to 1mm, and the particle size of the electric porcelain powder is less than 0.1 mm; the particle size of the raw aluminum powder is less than 0.1 mm.
4. The high-strength wear-resistant refractory brick as claimed in claim 1 or 2, wherein the binder is one or more of binding cement, phosphoric acid and aluminum phosphate.
5. A method for manufacturing a high-strength wear-resistant refractory brick according to any one of claims 1 to 4, comprising the steps of:
(1) crushing a secondary grade high-aluminum raw material, and screening into particles with the particle size of 1-3 mm; after crushing, screening the sub-white corundum into particles with the particle size of less than or equal to 1 mm; after the electroceramic is crushed, screening the electroceramic into particles with the particle size of less than or equal to 1 mm;
(2) selecting the electroceramic particles in percentage by weight, mixing the electroceramic particles with the raw aluminum powder in percentage by weight, and grinding the electroceramic particles into co-ground powder with the particle size less than 0.1 mm;
(3) selecting the secondary high-aluminum particles, the sub-white corundum particles and the electroceramic particles obtained in the step (1) according to the weight percentage, and mixing the secondary high-aluminum particles, the sub-white corundum particles and the electroceramic particles with the co-ground powder ground in the step (2) to prepare a mixture;
(4) adding the bonding agent with the weight percentage into the mixture prepared in the step (3) for mixing to prepare a mixed material;
(5) pressing the mixed material prepared in the step (4) into green bricks by adopting a numerical control brick press;
(6) and (4) drying the green brick prepared in the step (5), loading into a kiln, and sintering at 1450 ℃ to obtain a finished product.
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2020
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