CN115124367A - Acid-base corrosion resistant spray coating for cement kiln and preparation method thereof - Google Patents

Acid-base corrosion resistant spray coating for cement kiln and preparation method thereof Download PDF

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Publication number
CN115124367A
CN115124367A CN202210854294.9A CN202210854294A CN115124367A CN 115124367 A CN115124367 A CN 115124367A CN 202210854294 A CN202210854294 A CN 202210854294A CN 115124367 A CN115124367 A CN 115124367A
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powder
acid
spray coating
corrosion resistant
pore
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朱国平
王立旺
王琪
李新明
朱玉萍
彭晶晶
方利华
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Zhejiang Kingcred New Material Co ltd
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Zhejiang Kingcred New Material Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
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    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/0022—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof obtained by a chemical conversion or reaction other than those relating to the setting or hardening of cement-like material or to the formation of a sol or a gel, e.g. by carbonising or pyrolysing preformed cellular materials based on polymers, organo-metallic or organo-silicon precursors
    • C04B38/0025—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof obtained by a chemical conversion or reaction other than those relating to the setting or hardening of cement-like material or to the formation of a sol or a gel, e.g. by carbonising or pyrolysing preformed cellular materials based on polymers, organo-metallic or organo-silicon precursors starting from inorganic materials only, e.g. metal foam; Lanxide type products
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    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/02—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding chemical blowing agents
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    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/06—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances
    • C04B38/063—Preparing or treating the raw materials individually or as batches
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3427—Silicates other than clay, e.g. water glass
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    • C04B2235/9692—Acid, alkali or halogen resistance
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract

The invention belongs to the technical field of refractory materials, and particularly relates to an acid-base corrosion resistant spray coating for a cement kiln and a preparation method thereof. According to the invention, by adding the superfine powder and the pore-forming agent into the existing aggregate, powder and binding agent raw material system, the finally solidified spray coating has the comprehensive advantages of large solid density and relatively high aperture ratio, so that the spray coating is dense and not heavy, the sufficient acid and alkali corrosion resistance is ensured, the weight is not too large, and the normal use of the cement kiln is not influenced. In addition, the invention also provides a preparation method of the spray coating, which mainly comprises the steps of feeding, stirring and continuous stirring, and finally ensures that the components of the spray coating sprayed out from the front and back of the nozzle are relatively uniform all the time.

Description

Acid-base corrosion resistant spray coating for cement kiln and preparation method thereof
Technical Field
The invention belongs to the technical field of refractory materials, and particularly relates to an acid-base corrosion resistant spray coating for a cement kiln and a preparation method thereof.
Background
The cement kiln is mainly used for calcining cement clinker, and various chemical raw materials, harmful materials, heavy metals and the like can enter the cement kiln under the requirement of cooperative disposal of industrial and urban wastes in the cement kiln. Therefore, the acid and alkali corrosion resistance is particularly important for the refractory material inside the cement kiln.
On the other hand, because some narrow parts and special-shaped parts of the cement kiln are difficult to mold and cast, the cement kiln adopts refractory spray coating instead of refractory casting materials, such as preheaters, kiln head covers, tertiary air ducts and the like.
Chinese invention patent with patent publication No. CN102815955A and publication No. 2012.12.12 discloses an anti-skinning spray paint for cement kilns, which comprises the following components: flint clay, SiC, Guangxi white mud, alpha-Al 2 O 3 Micro powder, high-aluminum fine powder, SiC and SiC fine powder, pure calcium aluminate cement, spodumene, pyrophyllite and polypropylene fiber.
The spray paint of the patent is excellent in the anti-skinning property, but is insufficient in the direction of acid and alkali corrosion resistance. When a large amount of acidic or alkaline industrial waste enters the cement kiln, the spray paint is cracked, broken and dropped in a relatively short time.
Therefore, in view of the above, there is a need for a novel refractory spray paint with outstanding resistance to acid and alkali corrosion.
Disclosure of Invention
The invention provides an acid-base corrosion resistant spray coating for a cement kiln, which can ensure that the finally solidified spray coating has the comprehensive advantages of large entity density and relatively high aperture ratio by adding superfine powder and a pore-forming agent in the existing aggregate, powder and binding agent raw material system, so that the spray coating is dense and not heavy, the sufficient acid-base corrosion resistant performance is ensured, the weight is not too large, and the normal use of the cement kiln is not influenced.
In addition, the invention also provides a preparation method of the spray coating, which mainly comprises the steps of feeding, stirring and continuous stirring, and finally ensures that the components of the spray coating sprayed out from the front and back of the nozzle are relatively uniform all the time.
The technical scheme adopted by the invention for solving the problems is as follows: the acid-base corrosion resistant spray coating for the cement kiln comprises aggregate, powder, a binding agent, ultrafine powder and a pore-forming agent, wherein the ultrafine powder comprises alumina ultrafine powder, silicon carbide ultrafine powder and mullite ultrafine powder, the particle size of the ultrafine powder is 12-35 mu m, and the pore-forming agent comprises polyethylene microspheres, alum and sodium bicarbonate.
In the present invention, the reason why the spray paint has relatively strong acid-base corrosion resistance is that: after the superfine powder is added, the density of a sprayed paint entity is greatly improved, so that the corrosion speed of acid and alkali materials on the sprayed paint entity can be greatly reduced.
But on the other hand, if not stated, the same volume of the spray would be heavier than a conventional spray. Therefore, the ultrafine powder and the pore-forming agent are used together, so that the solidified spray coating is dense and not heavy, and the acid and alkali corrosion resistance and the portability in use are both considered.
Finally, the particle size range of the superfine powder is also relatively fine within the whole particle size range defined by the superfine powder, so that the superfine powder can more fully fill the gaps between the aggregates and the powder.
The further preferred technical scheme is as follows: the true density of the spray coating is 2.2-2.4g/cm 3 The apparent density of the spray coating is 1.6-1.7g/cm 3 。
In the present invention, the above true density numberThe values refer to: e.g. 1.6 cm 3 The solid volume of the spray paint is exactly 1.0 cm except the closed pore volume and the open pore volume 3 The weight is 2.2-2.4 g.
And the apparent density values refer to: e.g. 1.3cm 3 Removing the open pore volume of the surface, the volume enclosed by the outer surface is exactly 1.0 cm 3 The weight is 1.6-1.7 g.
In the present invention, the final cured spray coating has a "dense but not heavy" structural feature. In other words, the spray paint block of the present invention is just a little heavier, and possibly even almost heavier, than the conventional spray paint block for the same volume, but the cut-off small solid mass of the spray paint block of the present invention is much heavier than the conventional spray paint block.
Finally, the spray coating can give consideration to acid and alkali corrosion resistance and light weight, and avoids the situation that the preheater, the tertiary air duct and the like of the cement kiln are crushed due to overlarge weight.
The further preferred technical scheme is as follows: the addition weight of the superfine powder accounts for 5.0-7.5% of the total weight of the aggregate, the powder and the superfine powder.
In the present invention, if the added weight of the ultrafine powder is too small, the acid-base corrosion resistance of the ultrafine powder is lowered, and if it is too large, the apparent density of the ultrafine powder is significantly increased, which is not considered to be a good consideration.
The further preferable technical scheme is that the superfine powder comprises the following components in parts by weight: 35-40% of alumina superfine powder, 25-28% of silicon carbide superfine powder and the balance of mullite superfine powder.
The further preferred technical scheme is as follows: the grain diameter of the mullite superfine powder is 12-15 mu m.
In the invention, the hardness of the alumina superfine powder is higher than that of the mullite superfine powder, and the latter can realize a more compact filling effect by properly reducing the particle size, so the alumina superfine powder and the mullite superfine powder can almost achieve the same effect in the aspect of resisting acid-base corrosion, wherein the former depends on higher hardness and corrosion difficulty, and the latter depends on higher compactness and acid-base material difficulty entering degree.
The further preferable technical scheme is that the pore-forming agent comprises the following components in parts by weight: 75-78% of polyethylene microspheres, 10-12% of alum and the balance of sodium bicarbonate.
The further preferred technical scheme is as follows: the adding weight of the pore-forming agent accounts for 2-4% of the total weight of the aggregate, the powder and the ultramicro powder.
In the invention, the polyethylene microspheres deform and shrink rapidly after being heated to form closed pores for reducing weight, and the alum and the sodium bicarbonate are rapidly exhausted after being heated to form open pores and closed pores for reducing weight, so that the spray coating can be 'dense and not heavy'.
However, open pores are hardly useful per se against acid-base corrosion, but the thermal shock resistance of the spray coating can be suitably improved, so that the selection of "pore shape" requires mainly closed pores and secondarily open pores, which is why the polyethylene microspheres account for 75-78%.
A preparation method of an acid-base corrosion resistant spray coating for a cement kiln sequentially comprises the following steps:
s1, adding aggregate, powder, a bonding agent, superfine powder, a pore-forming agent and water into a stirrer;
and S2, starting the stirrer at the rotating speed of 60-120r/min, and stirring for 10-12min to obtain the final spray coating to be pumped.
The further preferred technical scheme is as follows: in S1, the weight of water accounts for 5-9% of the total weight of the aggregate, the powder, the bonding agent, the superfine powder and the pore-forming agent.
The further preferred technical scheme is as follows: and S2, when the spray paint is pumped, the rotating speed of the stirrer is 15-45 r/min.
In the invention, if the spraying material is not continuously stirred during pumping spraying, the ultrafine powder and the pore-forming agent are relatively unevenly distributed in the spraying material, so that after the spraying material is solidified, the early spraying part has relatively more pores, which is not beneficial to improving the acid-base corrosion resistance.
The present invention has the following advantages.
Firstly, the spray coating is dense but not heavy after being cured, takes the acid and alkali corrosion resistance and relatively light requirements into consideration, and ensures that the spray coating has relatively high practical value.
Secondly, the solid part of the spray coating enables the ultrafine powder to fill the gap between the aggregate and the powder, so that acid and alkali materials are difficult to enter, and the spray coating has high acid and alkali corrosion resistance.
Thirdly, the spray paint also comprises relatively more closed pores and relatively less open pores, wherein the closed pores are mainly used for reducing weight, and the open pores are mainly used for improving thermal shock resistance, namely the pore-forming agent has the two functions.
Fourthly, the acid and alkali corrosion resistance of the spray coating can be obviously improved only by adding a relatively small amount of the superfine powder and the pore-forming agent, which has higher economic value.
Fifthly, in the process of the preparation method of the spray coating, the raw materials of the spray coating are firstly quickly stirred for a short time and then continuously stirred for a long time, so that the raw materials of the spray coating are uniformly distributed and then uniformly sprayed, and the final spray coating has enough acid-base corrosion resistance everywhere.
Drawings
FIG. 1 is a table showing the composition of raw materials of 3 examples and 3 comparative examples of the present invention by weight.
FIG. 2 is a table of the results of the average performance test of the spray paint obtained by sampling at least 10 samples of 3 examples and 3 comparative examples of the present invention.
Detailed Description
The following description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention.
Example 1
As shown in attached figures 1 and 2, the acid-base corrosion resistant spray coating for the cement kiln comprises raw materials of aggregate, powder, a bonding agent, ultrafine powder, a pore-forming agent and water. The first five types are solid raw materials, and the weight is 100%, wherein: 52% of aggregate, 28% of powder, 12% of bonding agent, 5% of superfine powder and 3% of pore-forming agent.
The superfine powder comprises the following components in parts by weight: 35% of alumina superfine powder, 25% of silicon carbide superfine powder and the balance of mullite superfine powder, wherein the particle size of the superfine powder is 12-22 mu m. Wherein the grain diameter of the mullite submicron powder is 12-15 mu m.
The pore-forming agent comprises the following components in parts by weight: 75% of polyethylene microspheres, 10% of alum and the balance of sodium bicarbonate.
The true density of the spray coating is 2.2g/cm 3 The apparent density of the spray paint is 1.7g/cm 3 。
The preparation method of the acid-base corrosion resistant spray coating for the cement kiln sequentially comprises the following steps:
s1, adding aggregate, powder, a bonding agent, superfine powder, a pore-forming agent and water into a stirrer;
and S2, starting the stirrer at a rotating speed of 70r/min, and stirring for 10min to obtain the final spray paint to be pumped.
In S1, the weight of water accounts for 5% of the total weight of the aggregate, the powder, the bonding agent, the superfine powder and the pore-forming agent.
In S2, the rotation speed of the stirrer is 20r/min when the spray paint is pumped.
Finally, the spray coating in this embodiment is subjected to a spray curing operation, and 10 sites are selected for performance testing, wherein the test items include: acid resistance (%), alkali resistance, and the number of times of water-cooling thermal shock resistance (times) after 1100 ℃ for 5 hours, and the final average performance test result is shown in figure 2.
Example 2
As shown in attached figures 1 and 2, the acid-base corrosion resistant spray coating for the cement kiln comprises raw materials of aggregate, powder, a bonding agent, ultrafine powder, a pore-forming agent and water. The first five types are solid raw materials, and the weight is 100%, wherein: 53% of aggregate, 27% of powder, 13% of bonding agent, 5% of ultrafine powder and 2% of pore-forming agent.
The superfine powder comprises the following components in parts by weight: 40% of alumina superfine powder, 25% of silicon carbide superfine powder and the balance of mullite superfine powder, wherein the particle size of the superfine powder is 12-25 mu m. Wherein the grain diameter of the mullite submicron powder is 12-15 mu m.
The pore-forming agent comprises the following components in parts by weight: 78% of polyethylene microspheres, 10% of alum and the balance of sodium bicarbonate.
The true density of the spray coating is 2.3g/cm 3 The apparent density of the spray paint is 1.6g/cm 3 。
The preparation method of the acid-base corrosion resistant spray coating for the cement kiln sequentially comprises the following steps:
s1, adding aggregate, powder, a bonding agent, superfine powder, a pore-forming agent and water into a stirrer;
and S2, starting the stirrer at the rotating speed of 80r/min, and stirring for 12min to obtain the final spray paint to be pumped.
In S1, the weight of water accounts for 8% of the total weight of the aggregate, the powder, the bonding agent, the superfine powder and the pore-forming agent.
In S2, the rotation speed of the stirrer is 40r/min when the spray paint is pumped.
Finally, the spray coating in this embodiment is subjected to a spray curing operation, and 10 sites are selected for performance testing, wherein the test items include: acid resistance (%), alkali resistance, and the number of times of water-cooling thermal shock resistance (times) after 1100 ℃ for 5 hours, and the final average performance test result is shown in figure 2.
Example 3
As shown in attached figures 1 and 2, the acid-base corrosion resistant spray coating for the cement kiln comprises raw materials of aggregate, powder, bonding agent, superfine powder, pore-forming agent and water. The first five types are solid raw materials, and the weight is 100%, wherein: 51% of aggregate, 25% of powder, 15% of bonding agent, 6% of ultrafine powder and 3% of pore-forming agent.
The superfine powder comprises the following components in parts by weight: 36% of alumina superfine powder, 28% of silicon carbide superfine powder and the balance of mullite superfine powder, wherein the particle size of the superfine powder is 12-30 mu m. Wherein the grain diameter of the mullite submicron powder is 12-15 mu m.
The pore-forming agent comprises the following components in parts by weight: 76% of polyethylene microspheres, 10% of alum and the balance of sodium bicarbonate.
The spray nozzleThe true density of the coating is 2.2g/cm 3 The apparent density of the spray paint is 1.6g/cm 3 。
The preparation method of the acid-base corrosion resistant spray coating for the cement kiln sequentially comprises the following steps:
s1, adding aggregate, powder, a bonding agent, superfine powder, a pore-forming agent and water into a stirrer;
and S2, starting the stirrer at a rotating speed of 100r/min, and stirring for 12min to obtain the final spray paint to be pumped.
In S1, the weight of water accounts for 5% of the total weight of the aggregate, the powder, the bonding agent, the superfine powder and the pore-forming agent.
In S2, the rotation speed of the stirrer is 15r/min when the spray paint is pumped.
Finally, the spray coating in this embodiment is subjected to a spray curing operation, and 10 sites are selected for performance testing, wherein the test items include: acid resistance (%), alkali resistance, and water-cooling thermal shock resistance times (times) after 1100 ℃ and 5h, and the final average performance test result is shown in figure 2.
Comparative example 1
As shown in FIGS. 1 and 2, the spray paint of the comparative example is different from the spray paint of example 1 only in the following 2 points.
The first and the second comparative examples of the spray coating material comprise aggregate, powder, binder, and water. The first three types are solid raw materials, and the weight is 100%, wherein: 54% of aggregate, 28% of powder and 18% of binding agent.
Secondly, in S1, the adding weight of water accounts for 5 percent of the total weight of the aggregate, the powder and the bonding agent.
In addition, the density of the spray paint of this comparative example was measured to obtain the data: true density 2.0g/cm 3 And an apparent density of 1.9g/cm 3 。
And finally, carrying out spraying and curing operation on the spray paint in the comparative example, and selecting 10 places for performance test, wherein the test items comprise: acid resistance (%), alkali resistance, and the number of times of water-cooling thermal shock resistance (times) after 1100 ℃ for 5 hours, and the final average performance test result is shown in figure 2.
Comparative example 2
As shown in fig. 1 and 2, the spray paint of the comparative example is different from the spray paint of example 2 only in the following 3 points.
The first and the second comparative examples of the spray coating material comprise aggregate, powder, binder, pore-forming agent and water. The first four types are solid raw materials, and the weight is calculated by 100%, wherein: 52% of aggregate, 29% of powder, 17% of bonding agent and 2% of pore-forming agent.
Secondly, in S1, the added weight of water accounts for 8% of the total weight of the aggregate, the powder, the bonding agent and the pore-forming agent.
Thirdly, there is no ultrafine powder, so there is no limitation on the pore former.
In addition, the density of the spray paint in the comparative example was measured, and the data were: true density 2.2g/cm 3 And an apparent density of 2.1g/cm 3 。
And finally, carrying out spraying and curing operation on the spray paint in the comparative example, and selecting 10 positions for performance test, wherein the test items comprise: acid resistance (%), alkali resistance, and the number of times of water-cooling thermal shock resistance (times) after 1100 ℃ for 5 hours, and the final average performance test result is shown in figure 2.
Comparative example 3
As shown in fig. 1 and 2, the spray paint of the comparative example is different from the spray paint of example 3 only in the following 3 points.
The first and the second comparative examples of the spray coating are prepared from aggregate, powder, binder, superfine powder and water. The first four types are solid raw materials, and the weight is calculated by 100%, wherein: 53% of aggregate, 28% of powder, 14% of binding agent and 5% of ultrafine powder.
Secondly, in S1, the adding weight of water accounts for 5% of the total weight of the aggregate, the powder, the bonding agent and the superfine powder.
Thirdly, there is no pore former, so there is no limitation on the ultrafine powder in relation thereto.
Also, for the comparative exampleThe density of the spray coating is detected, and the obtained data are as follows: true density 1.8g/cm 3 And an apparent density of 1.7g/cm 3 。
And finally, carrying out spraying and curing operation on the spray paint in the comparative example, and selecting 10 places for performance test, wherein the test items comprise: acid resistance (%), alkali resistance, and the number of times of water-cooling thermal shock resistance (times) after 1100 ℃ for 5 hours, and the final average performance test result is shown in figure 2.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various modifications can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. These are non-inventive modifications, which are intended to be protected by patent laws within the scope of the claims appended hereto.

Claims (10)

1. The acid and alkali corrosion resistant spray coating for the cement kiln comprises aggregate, powder and a bonding agent, and is characterized in that: the composite material also comprises ultrafine powder and a pore-forming agent, wherein the ultrafine powder comprises alumina ultrafine powder, silicon carbide ultrafine powder and mullite ultrafine powder, the particle size of the ultrafine powder is 12-35 mu m, and the pore-forming agent comprises polyethylene microspheres, alum and sodium bicarbonate.
2. The acid-base corrosion resistant spray paint for cement kilns as claimed in claim 1, wherein: the true density of the spray coating is 2.2-2.4g/cm 3 The apparent density of the spray coating is 1.6-1.7g/cm 3 。
3. The acid-base corrosion resistant spray paint for cement kilns as claimed in claim 1, wherein: the addition weight of the superfine powder accounts for 5.0-7.5% of the total weight of the aggregate, the powder and the superfine powder.
4. The acid-base corrosion resistant spray coating for the cement kiln according to claim 1, characterized in that the ultrafine powder comprises the following components by weight: 35-40% of alumina superfine powder, 25-28% of silicon carbide superfine powder and the balance of mullite superfine powder.
5. The acid-base corrosion resistant spray paint for cement kilns as claimed in claim 1, wherein: the grain diameter of the mullite superfine powder is 12-15 mu m.
6. The acid-base corrosion resistant spray paint for the cement kiln according to claim 1, characterized in that the pore-forming agent comprises the following components by weight: 75-78% of polyethylene microspheres, 10-12% of alum and the balance of sodium bicarbonate.
7. The acid-base corrosion resistant spray paint for cement kilns as claimed in claim 1, wherein: the adding weight of the pore-forming agent accounts for 2-4% of the total weight of the aggregate, the powder and the ultramicro powder.
8. The method for preparing the acid-base corrosion resistant spray paint for the cement kiln according to claim 1, which is characterized by sequentially comprising the following steps:
s1, adding aggregate, powder, a bonding agent, superfine powder, a pore-forming agent and water into a stirrer;
and S2, starting the stirrer at the rotating speed of 60-120r/min, and stirring for 10-12min to obtain the final spray coating to be pumped.
9. The method for preparing the acid-base corrosion resistant spray paint for the cement kiln according to claim 8, wherein the method comprises the following steps: in S1, the weight of water accounts for 5-9% of the total weight of the aggregate, the powder, the bonding agent, the superfine powder and the pore-forming agent.
10. The method for preparing the acid-base corrosion resistant spray paint for the cement kiln according to claim 8, wherein the method comprises the following steps: and S2, when the spray paint is pumped, the rotating speed of the stirrer is 15-45 r/min.
CN202210854294.9A 2022-07-20 2022-07-20 Acid-base corrosion resistant spray coating for cement kiln and preparation method thereof Pending CN115124367A (en)

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