Aluminum-zirconium silicon carbide brick for cyclone separator of garbage incinerator and preparation process of aluminum-zirconium silicon carbide brick

Abstract

The invention belongs to the technical field of refractory materials, and particularly relates to an aluminum-zirconium silicon carbide brick for a cyclone separator of a garbage incinerator and a preparation process of the aluminum-zirconium silicon carbide brick. The aluminum-zirconium silicon carbide brick comprises 63-83% of silicon carbide, 5-10% of alumina micro powder, 2-7% of zirconium silicon micro powder, 5-10% of zirconium oxide and 5-10% of an inhibitor. The coating further comprises 3-8% of a binding agent and 50-80% of brine for dipping. When the aluminum-zirconium silicon carbide brick for the cyclone separator of the garbage incinerator is produced, specific raw materials are selected, reasonable matching is adopted, an inhibitor and a salt-resistant binder are added, and after high-pressure forming and high-temperature sintering, the brick is soaked in special brine in a vacuum reaction kettle and then baked at medium temperature, so that the material has good resistance to high salt, and the service life of the brick is prolonged. The erosion resistance of the material is realized.

Description

Technical Field

[0001] The invention belongs to the field of refractory materials, and in particular relates to an aluminum-zirconium silicon carbide brick for a cyclone separator of a garbage incinerator and a preparation process thereof. Background Art

[0002] Large-scale waste incinerators are thermal kilns that burn waste for heating or power generation. The daily waste processing capacity is more than 1,000 tons. The cyclone separator in the furnace is the key equipment for full waste incineration and harmless flue gas emission. It is also the most demanding environment for use. The long-term use temperature is around 1,300°C, the wind speed is as high as 30m / S or more, and the high-speed wind carries the solid matter after the waste incineration to directly flush the furnace lining, which requires very high high-temperature wear resistance of the lining material. Therefore, the service life of the lining material in the cyclone separator directly determines the service life of the waste incinerator. According to the design requirements for the internal lining of the cyclone separator under this working condition, the lining must have strong high-temperature resistance, especially the wear resistance against solid matter erosion under high temperature.

[0003] The traditional domestic practice is to increase the sintering strength of the material to increase the wear resistance. However, since the conventional wear resistance is tested under room temperature, it cannot show good wear resistance in the high temperature process, which greatly reduces the service life of the material. At the same time, the various heavy metal elements mixed in the waste incineration process will also undergo chemical replacement reactions with the components in the lining material, resulting in an irreversible expansion reaction process, which will cause the surface volume of the material to expand, the organizational structure to become loose and slag, and then the thickness of the lining will be sharply reduced. The selection of materials with other properties has specific use conditions, so the traditional approach cannot solve the problem well. Summary of the invention

[0004] In view of this, the technical problem to be solved by the present invention is to provide an aluminum zirconium silicon carbide brick for a cyclone separator of a waste incinerator and a preparation process thereof, aiming at selecting specific raw materials, adopting reasonable matching, adding inhibitors and anti-corrosion binders when producing aluminum zirconium silicon carbide bricks for a cyclone separator of a waste incinerator, and through high-pressure molding and high-temperature sintering, impregnating the bricks with special brine in a vacuum reactor and then baking them at medium temperature, so that the material itself has good resistance to high salt, thereby achieving the material's wear resistance and corrosion resistance.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] An aluminum-zirconium silicon carbide brick for a cyclone separator of a garbage incinerator comprises the following components in percentage by mass:

[0007]

[0008] Preferably, the aluminum-zirconium silicon carbide brick further comprises an admixture, and the admixture comprises the following components in percentage by mass:

[0009] Binder 3-8%

[0010] The brine used for soaking is 50-80%.

[0011] Preferably, the silicon carbide has a particle size of 6-0.044 mm, a porosity of ≤3%, a water absorption rate of ≤1.5%, and a SiC content of more than 98%.

[0012] Preferably, the particle size of the alumina powder is ≤0.0015 mm, the alumina content is ≥99.5%, and the peak value is a double peak.

[0013] Preferably, the particle size of the zirconium silicon powder is ≤0.005 mm, and the zirconium oxide content is ≥3%.

[0014] Preferably, the particle size of the zirconium oxide is ≤0.003 mm, the zirconium oxide content is ≥99.5%, and the zirconium oxide is monoclinic zirconium.

[0015] Preferably, the inhibitor is a mixture of rare earth raw materials, the main components of which are cerium oxide and yttrium oxide.

[0016] Preferably, the binder is liquid aluminum sol; the brine for impregnation is a diluent of 30% bittern and 20% hexametaphosphate.

[0017] The second technical purpose of the present invention is to request protection for the preparation process of the aluminum zirconium silicon carbide brick for the cyclone separator of the above-mentioned garbage incinerator, which comprises the following steps:

[0018] 1. Add the raw materials in the above mass percentages, and mix and granulate them through an inclined granulator to ensure that the fine powder is evenly coated on the particles and formed into small balls, which is convenient for later pressing. The mixing time is 5-8 minutes. The mixed raw materials need to be trapped for 8-16 hours to ensure that the binder is fully infiltrated into the raw materials;

[0019] 2. The bricks are pressed and formed by a 2000-ton servo hydraulic press to ensure the density of the bricks;

[0020] 3. After the pressed bricks are naturally dried for more than 24 hours, they are put into the drying kiln for baking at a temperature of 180-200°C for 72-100 hours;

[0021] 4. The dried bricks are fired in a high-temperature shuttle kiln at a temperature of 1750°C for 8 hours;

[0022] 5. The fired product is vacuum impregnated with special brine in the reactor for 8 hours, naturally dried and then re-fired in a medium-temperature furnace at 1200°C for 3 hours.

[0023] The present invention discloses an aluminum zirconium silicon carbide brick for a cyclone separator of a garbage incinerator and a preparation process thereof, which has the following characteristics:

[0024] Beneficial effects:

[0025] 1. The aluminum-zirconium silicon carbide bricks for the cyclone separator of the waste incinerator of the present invention have high room temperature compressive strength and high temperature compressive strength, which can effectively resist the thermal stress of the equipment under high temperature conditions and ensure the structural stability of the lining material;

[0026] 2. The aluminum-zirconium silicon carbide brick for the cyclone separator of the waste incinerator of the present invention has an ultra-low apparent porosity, which can effectively resist the penetration of materials and reduce the damage caused by permeability erosion;

[0027] 3. The aluminum-zirconium silicon carbide bricks for the cyclone separator of the garbage incinerator of the present invention have good thermal shock stability and can effectively resist the stress damage caused by the temperature fluctuation caused by starting and stopping the furnace;

[0028] 4. The present invention introduces an inhibitor, which is used to effectively avoid or slow down the reaction rate between metal ions and materials, thereby ensuring the stability of the material structure during use and increasing the service life of the material.

[0029] 5. The present invention innovatively adopts the process of brine immersion and re-firing of finished bricks, which improves the properties of the overall material to a certain extent and enhances the material's resistance to wear and corrosion. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The word "embodiment" used here as an "exemplary" does not necessarily mean that any embodiment described is superior to or better than other embodiments. Unless otherwise specified, the performance index tests in the embodiments of this application are performed using conventional test methods in the art. It should be understood that the terms described in this application are only used to describe specific implementation methods and are not used to limit the content disclosed in this application.

[0032] Unless otherwise specified, the technical and scientific terms used in this document have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs; other experimental methods and technical means not specifically specified in this application refer to experimental methods and technical means commonly used by ordinary technicians in this field.

[0033] In order to better illustrate the content of the present application, numerous specific details are provided in the specific examples below. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In the embodiments, some methods, means, instruments, equipment, etc. well known to those skilled in the art are not described in detail in order to highlight the main purpose of the present application.

[0034] Under the premise of no conflict, the technical features disclosed in the embodiments of the present application can be combined arbitrarily, and the resulting technical solutions belong to the contents disclosed in the embodiments of the present application.

[0035] In order to better understand the present invention, the present invention is further specifically described below through the following examples, but it should not be understood as a limitation of the present invention. Some non-essential improvements and adjustments made by technicians in this field based on the above invention content are also considered to fall within the protection scope of the present invention.

[0036] Example 1 (weight ratio)

[0037]

[0038] Plus:

[0039] Binder 3%

[0040] Brine for soaking 50%

[0041] Example 2 (weight ratio)

[0042]

[0043] Plus:

[0044] Binder 3%

[0045] Brine for soaking 50%

[0046] Example 3 (weight ratio)

[0047]

[0048]

[0049] Plus:

[0050] Binder 5%

[0051] Brine for soaking 70%

[0052] Example 4 (weight ratio)

[0053]

[0054] Plus:

[0055] Binder 5%

[0056] The brine used for soaking is 80%.

[0057] According to the mass percentage disclosed above, the aluminum zirconium silicon carbide brick for the cyclone separator of the garbage incinerator is prepared according to the following operating steps:

[0058] 1) adding the raw materials in the mass percentages as described in Examples 1 to 4, and mixing and granulating them by an inclined granulator to ensure that the fine powder is evenly coated on the particles and formed into small balls, which is convenient for later pressing. The mixing time is 5-8 minutes, and the raw materials after mixing need to be trapped for 8-16 hours to ensure that the binder is fully infiltrated into the raw materials;

[0059] 2) The bricks are pressed and formed by a 2000-ton servo hydraulic press to ensure the density of the bricks;

[0060] 3) The pressed bricks are naturally dried for more than 24 hours and then put into a drying kiln for baking at a temperature of 180-200°C for 72-100 hours;

[0061] 4) The dried bricks are fired in a high-temperature shuttle kiln at a temperature of 1750°C for 8 hours;

[0062] 5) The fired product is vacuum impregnated with special brine in a reactor for 8 hours, naturally dried and then re-fired in a medium-temperature furnace at a medium-temperature firing temperature of 1200°C for 3 hours.

[0063]

[0064]

[0065] The experimental results show that Example 3 has better anti-wear and anti-erosion capabilities.

[0066] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An aluminum-zirconium silicon carbide brick for a cyclone separator of a waste incinerator, characterized in that: The aluminum zirconium silicon carbide brick comprises the following components by mass percentage:

2. The aluminum-zirconium silicon carbide brick for a cyclone separator of a waste incinerator according to claim 1, characterized in that: The aluminum zirconium silicon carbide brick also includes an admixture, and the admixture includes the following components in percentage by mass: Binder 3-8% The brine used for soaking is 50-80%.

3. The aluminum-zirconium silicon carbide brick for a cyclone separator of a waste incinerator according to claim 1 or 2, characterized in that: The silicon carbide has a particle size of 6-0.044 mm, a porosity of ≤3%, a water absorption rate of ≤1.5%, and a SiC content of more than 98%.

4. The aluminum-zirconium silicon carbide brick for a cyclone separator of a waste incinerator according to claim 1 or 2, characterized in that: The particle size of the alumina micropowder is ≤0.0015 mm, the alumina content is ≥99.5%, and the peak value is a double peak.

5. The aluminum-zirconium silicon carbide brick for a cyclone separator of a waste incinerator according to claim 1 or 2, characterized in that: The particle size of the zirconium silicon powder is ≤0.005 mm, and the zirconium oxide content is ≥3%.

6. The aluminum-zirconium silicon carbide brick for a cyclone separator of a waste incinerator according to claim 1 or 2, characterized in that: The particle size of the zirconium oxide is ≤0.003 mm, the zirconium oxide content is ≥99.5%, and the zirconium oxide is monoclinic zirconium.

7. The aluminum-zirconium silicon carbide brick for a cyclone separator of a waste incinerator according to claim 1 or 2, characterized in that: The inhibitor is a mixture of rare earth raw materials, the main components of which are cerium oxide and yttrium oxide.

8. The aluminum-zirconium silicon carbide brick for a cyclone separator of a waste incinerator according to claim 1 or 2, characterized in that: The binder is liquid aluminum sol; the brine for immersion is a diluent of 30% bittern and 20% hexametaphosphate.

9. A process for preparing aluminum-zirconium silicon carbide bricks for cyclone separators of waste incinerators as claimed in claim 1 or 2, characterized in that: The steps include: 1) adding the raw materials in the mass percentage as claimed in claim 1 or 2, and mixing and granulating them by an inclined granulator to ensure that the fine powder is evenly coated on the particles and formed into small balls, which is convenient for later pressing. The mixing time is 5-8 minutes, and the raw materials after mixing need to be trapped for 8-16 hours to ensure that the binder is fully infiltrated into the raw materials; 2) The bricks are pressed and formed by a 2000-ton servo hydraulic press to ensure the density of the bricks; 3) The pressed bricks are naturally dried for more than 24 hours and then put into a drying kiln for baking at a temperature of 180-200°C for 72-100 hours; 4) The dried bricks are fired in a high-temperature shuttle kiln at a temperature of 1750°C for 8 hours; 5) The fired product is vacuum impregnated with special brine in a reactor for 8 hours, naturally dried and then re-fired in a medium-temperature furnace at a medium-temperature firing temperature of 1200°C for 3 hours.

Images