Anti-erosion castable for waste lye incinerator and preparation method of anti-erosion castable

Abstract

The invention belongs to the technical field of refractory materials, and particularly relates to an anti-erosion castable for a waste lye incinerator and a preparation method of the anti-erosion castable. The anti-erosion castable is prepared from 30%-50% of recombined zirconium mullite, 5%-10% of synthetic nitride, 6%-12% of silicon carbide, 3%-10% of aluminum oxide superfine powder, 4%-10% of stable zirconium oxide, 5%-15% of tabular corundum, 3%-10% of zirconium silicon micropowder and 5%-12% of high-temperature aluminum oxide cement. The concrete is characterized by further comprising 0.5%-1.5% of a retarder, 0.5%-1.5% of a coagulant, 0.5%-1.5% of a reinforcing agent, 1%-3% of an anti-penetrating agent and 4%-6% of water. A layer of anti-erosion castable is poured on the inner side of the steel shell of the incinerator, the thickness of the anti-erosion castable is about 180-200 cm, overall protection of the inner side of the steel shell is achieved through castable construction, the inner side of the steel shell can be isolated from incineration liquid, and it can be guaranteed that lining materials have enough anti-erosion performance.

Description

Technical Field

[0001] The invention belongs to the field of refractory materials, and in particular relates to an anti-corrosion castable for a waste alkali liquid incinerator and a preparation method thereof. Background Art

[0002] Waste alkali liquid is a highly polluting liquid produced during the extraction process of petrochemical industry products. The composition of this liquid is very complex, generally composed of sodium carbonate, sodium hydroxide and sodium oxide. It belongs to the category of alkali salts and has a conversion process of alkalinity and salinity during high temperature. The performance requirements of refractory materials are extremely stringent. Refractory materials must have strong resistance to alkali and salt erosion.

[0003] The waste alkali salt incinerator is the last node for harmless treatment of high-risk waste alkali liquid in the petrochemical industry, and it is also the core point of environmental protection management in the entire industry. The quality of lining materials seriously restricts the normal operation time and maintenance cycle of the previous equipment. The traditional practice is generally based on aluminum silicon materials, and even adds a large amount of high-temperature materials such as corundum to improve high-temperature performance. The high-temperature performance of the material alone is absolutely fine, but the alkali and salt erosion resistance in the high-temperature process is still not good. The general service life is between 3-6 months. Later, adding some inert materials on the original basis did not solve the erosion 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 anti-corrosion castable for a waste alkali liquid incinerator and a preparation method thereof in view of the deficiencies in the prior art, aiming to cast a layer of anti-corrosion castable with a thickness of about 180-200 cm on the inner side of the steel shell of the incinerator, and to achieve overall protection of the inner side of the steel shell through the construction of the castable, which can not only isolate the inner side of the steel shell from the incineration liquid, but also ensure that the lining material has sufficient anti-corrosion performance.

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

[0006] An anti-corrosion castable for a waste alkali liquid incinerator comprises the following components in percentage by mass:

[0007]

[0008]

[0009] Preferably, the erosion-resistant castable further comprises an admixture, specifically comprising the following components by mass percentage:

[0010]

[0011] Preferably, the particle size of the rebonded mullite is 8-200 mesh;

[0012] The synthetic nitride is one or more combinations of silicon-nitrogen compounds, oxygen-nitrogen compounds, and silicon-oxygen-nitrogen compounds.

[0013] Preferably, the particle size of the silicon carbide is 200-325 mesh, and the SiC content is ≥98%;

[0014] The particle size of the ultrafine alumina powder is 5000-8000 mesh, and the Al2O3 content is ≥99%;

[0015] The particle size of the stabilized zirconium oxide is 3000-5000 mesh;

[0016] The plate-shaped corundum has a particle size of 80-325 mesh and an Al2O3 content of ≥99%;

[0017] The particle size of the zirconium silicon powder is 6000-8000 mesh, and the Zr2O3 content is ≥3%;

[0018] The particle size of the high temperature alumina cement is 200-500 meshes, and the Al2O3 content is ≥80%.

[0019] Preferably, the retarder is one or more combinations of citric acid, oxalic acid, sodium tripolyphosphate, methyl cellulose, lignin sulfonate, and alkyl benzene sulfonate;

[0020] The coagulant is one or more combinations of sodium aluminate, solid sodium sulfate ethyl acetate, and aluminum fluoride.

[0021] Preferably, the enhancer is one or more combinations of hypochlorous acid, acrylic acid polymers, and polychlorinated compounds;

[0022] The anti-penetration agent is one or more combinations of organic silicon polymer, nano-calcifier and organic silicate.

[0023] The second technical purpose of the present invention is to request protection for a method for preparing the above-mentioned corrosion-resistant castable for the waste alkali liquid incinerator, comprising the following steps:

[0024] 1. After synthetic nitride, ultrafine alumina powder, stabilized zirconium oxide and zirconium silicon powder are measured according to the process proportion, various raw materials are dispersed and recombined and wrapped to form particles less than 1 mm through the impact of the airflow granulator;

[0025] 2. After the retarder, coagulant, enhancer and anti-penetration agent are weighed according to the process ratio, the reference agent and water are dissolved first in a mass ratio of 1:50, and heated to 80-100℃ for more than 3 hours to allow it to completely dissolve and react;

[0026] 3. Pour all the granules and powders into the mixer, add the dissolved admixtures and water, stir for 5-8 minutes, and then discharge the materials for use. During construction, you can use machine vibration, mechanical spraying, manual application, etc.

[0027] The present invention discloses an anti-corrosion castable for a waste alkali liquid incinerator and a preparation method thereof, which has the following beneficial effects:

[0028] 1. The castable of the present invention can be integrally cast inside the steel shell of the incinerator equipment, has good air tightness, and the casting thickness can be adjusted automatically, which can effectively prevent the internal atmosphere of the high-temperature equipment from corroding the steel shell;

[0029] 2. The castable of the present invention uses a variety of composite ultrafine powders to greatly reduce the apparent porosity, effectively blocking the penetration of slag into the material and improving the material's anti-penetration ability;

[0030] 3. The present invention premixes and granulates synthetic nitride, ultrafine alumina powder, stabilized zirconium oxide and zirconium silicon powder: after the synthetic nitride, ultrafine alumina powder, stabilized zirconium oxide and zirconium silicon powder are metered according to the process ratio, various raw materials are dispersed and recombined and wrapped to form particles below 1 mm through the impact of the airflow granulator, which can effectively solve the problem that the ultrafine powder is not well dispersed and cannot be evenly distributed, and give full play to the effect and function of the ultrafine powder;

[0031] 4. The present invention innovatively introduces synthetic nitride as the matrix material, and utilizes its super strong acid, alkali and salt corrosion resistance and slag resistance to effectively improve the overall corrosion resistance of the castable;

[0032] 5. The present invention innovatively weighs the retarder, accelerator, enhancer and anti-penetration agent according to the process ratio, dissolves them first in the ratio of 1:50 between the reference agent and water, and heats them to 80-100°C for more than 3 hours to allow them to completely dissolve and react, so as to maximize the effect of the admixture. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] Example 1 (weight ratio)

[0040]

[0041] Plus:

[0042]

[0043] Example 2 (weight ratio)

[0044]

[0045]

[0046] Plus:

[0047]

[0048] Example 3 (weight ratio)

[0049]

[0050] Plus:

[0051]

[0052] Example 4 (weight ratio)

[0053]

[0054]

[0055] Plus:

[0056]

[0057] According to the mass percentage disclosed above, the corrosion-resistant castable for the waste alkali liquid incinerator is prepared according to the following operating steps:

[0058] 1. After synthetic nitride, ultrafine alumina powder, stabilized zirconium oxide and zirconium silicon powder are measured according to the process proportion, various raw materials are dispersed and recombined and wrapped to form particles less than 1 mm through the impact of the airflow granulator;

[0059] 2. After the retarder, coagulant, enhancer and anti-penetration agent are weighed according to the process ratio, the reference agent and water are dissolved first in a mass ratio of 1:50, and heated to 80-100℃ for more than 3 hours to allow it to completely dissolve and react;

[0060] 3. Pour all the granules and powders into the mixer, add the dissolved admixtures and water, stir for 5-8 minutes, and then discharge the materials for use. During construction, you can use machine vibration, mechanical spraying, manual application, etc.

[0061] project Testing standards Example 1 Example 2 Example 3 Example 4 Compressive strength MPa GB / T5072-2008 185MPa 152MPa 165MPa 173MPa Apparent porosity% GB / T2997-2015 9.8 13.5 12.8 10.4 Corrosion resistance mm GB / T8931-2007 0.68 2.7 2.2 1.4

[0062] 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. A corrosion-resistant castable for a waste alkali liquid incinerator, characterized in that: The erosion-resistant castable comprises the following components in percentage by mass:

2. The corrosion-resistant castable for a waste alkali liquid incinerator according to claim 1, characterized in that: The anti-corrosion castable also includes an admixture, specifically including the following components by mass percentage:

3. The corrosion-resistant castable for a waste alkali liquid incinerator according to claim 1 or 2, characterized in that: The particle size of the rebonded mullite is 8-200 mesh; The synthetic nitride is one or more combinations of silicon-nitrogen compounds, oxygen-nitrogen compounds, and silicon-oxygen-nitrogen compounds.

4. The corrosion-resistant castable for a waste alkali liquid incinerator according to claim 1 or 2, characterized in that: The particle size of the silicon carbide is 200-325 mesh, and the SiC content is ≥98%; The particle size of the ultrafine alumina powder is 5000-8000 mesh, and the Al2O3 content is ≥99%; The particle size of the stabilized zirconium oxide is 3000-5000 mesh; The plate-shaped corundum has a particle size of 80-325 mesh and an Al2O3 content of ≥99%; The particle size of the zirconium silicon powder is 6000-8000 mesh, and the Zr2O3 content is ≥3%; The particle size of the high temperature alumina cement is 200-500 meshes, and the Al2O3 content is ≥80%.

5. The corrosion-resistant castable for a waste alkali liquid incinerator according to claim 1 or 2, characterized in that: The retarder is one or more combinations of citric acid, oxalic acid, sodium tripolyphosphate, methyl cellulose, lignin sulfonate, and alkyl benzene sulfonate; The coagulant is one or more combinations of magnesium-containing polymers, high molecular lithium salts, sodium aluminate, solid sodium sulfate ethyl acetate, and aluminum fluoride.

6. The corrosion-resistant castable for a waste alkali liquid incinerator according to claim 1 or 2, characterized in that: The enhancer is one or more combinations of hypochlorous acid, acrylic acid polymer, high molecular sodium carbonate, and polychlorinated compounds; The anti-penetration agent is one or more combinations of organic silicon polymers, nano-calcifiers, organic silicates, and inorganic acids.

7. A method for preparing the corrosion-resistant castable for a waste alkali liquid incinerator as claimed in claim 1 or 2, characterized in that: The steps include: 1) After synthetic nitride, ultrafine alumina powder, stabilized zirconium oxide and zirconium silicon powder are measured according to the process ratio, various raw materials are dispersed and recombined and wrapped to form particles less than 1 mm through the impact of the airflow granulator; 2) After weighing the retarder, accelerator, enhancer and anti-penetration agent according to the process ratio, dissolve them first in the ratio of 1:50 of reference agent to water, and heat them to 80-100℃ for more than 3 hours to make them completely dissolved and react; 3) Pour all the granules and powders into a mixer, add dissolved admixtures and water, stir for 5-8 minutes, and discharge the materials for use. During construction, the materials can be applied by machine vibration, mechanical spraying, manual application, etc.

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