CN111978089B - Dry-type spray coating for coal injection pipe and preparation method thereof - Google Patents
Dry-type spray coating for coal injection pipe and preparation method thereof Download PDFInfo
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- CN111978089B CN111978089B CN202010848396.0A CN202010848396A CN111978089B CN 111978089 B CN111978089 B CN 111978089B CN 202010848396 A CN202010848396 A CN 202010848396A CN 111978089 B CN111978089 B CN 111978089B
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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
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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
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/56—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides
- C04B35/565—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on silicon carbide
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- C—CHEMISTRY; METALLURGY
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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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- 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
- 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
- C04B2235/34—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
- C04B2235/3463—Alumino-silicates other than clay, e.g. mullite
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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
- 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
- C04B2235/34—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
- C04B2235/349—Clays, e.g. bentonites, smectites such as montmorillonite, vermiculites or kaolines, e.g. illite, talc or sepiolite
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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
- 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
- C04B2235/40—Metallic constituents or additives not added as binding phase
- C04B2235/402—Aluminium
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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
- 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
- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
- C04B2235/447—Phosphates or phosphites, e.g. orthophosphate, hypophosphite
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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
- 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
- C04B2235/48—Organic compounds becoming part of a ceramic after heat treatment, e.g. carbonising phenol resins
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- Manufacturing & Machinery (AREA)
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- Organic Chemistry (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Ceramic Products (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The invention relates to a dry spray coating for a coal injection pipe, which comprises the following components in parts by weight: 18-27 parts of andalusite, 40-57 parts of silicon carbide particles, 8-15 parts of silicon carbide powder, 10-15 parts of alumina powder, 4-8 parts of aluminum dihydrogen phosphate dry powder, 3-6 parts of soft clay, 1-2 parts of calcium aluminate cement, 1-2 parts of calcium lignosulfonate and 0.005-0.01 part of metal aluminum powder, and the preparation process comprises the following steps: the raw materials are mixed according to a certain proportion, then uniformly mixed, added into a spraying machine, and applied by a dry spraying method, and water is added at the outlet of a spray gun of the spraying machine. The spray coating prepared by the invention has the advantages of high strength, good volume stability, excellent thermal shock resistance, strong alkali resistance and wear resistance, good adhesion, low rebound rate, high hardening speed, convenient construction, no need of erecting a mold, no need of maintenance, high construction speed, labor saving, time saving, labor saving and the like, and the overhaul and maintenance time of the coal injection pipe for the cement kiln is greatly shortened.
Description
Technical Field
The invention belongs to the technical field of unshaped refractory materials, and particularly relates to a dry spray coating for a coal injection pipe and a preparation method thereof.
Background
The coal injection pipe is a key device for calcining cement clinker, and the service life of the coal injection pipe has important influence on the running period of the whole production line. The coal injection pipe of the cement kiln has severe use conditions, works at high temperature for a long time, is unevenly heated at each part, bears the high temperature in the kiln up to 1400 ℃, also bears the scouring of cement kiln clinker, the thermal stress caused by secondary air from a grate cooler and the influence of chlor-alkali corrosion on the coal injection pipe, thereby providing higher requirements for the comprehensive performance of the materials used by the coal injection pipe of the cement kiln. The coal injection pipes in the prior art are integrally molded by casting, the service life is different from 3 to 8 months, the coal injection pipes are maintained by adopting the casting materials, the coal injection pipes can be put into use only by the processes of cleaning, formwork erecting, baking and the like, the period is long, the construction labor intensity is high, and the use requirement of quick maintenance cannot be met. The coal injection pipe is maintained and repaired quickly and practically by adopting a spraying mode, and compared with the traditional pouring method, the method has the advantages that the economic benefit can be improved by times, the construction period is short, the hardening is quick, the special maintenance is not needed, the temperature can be quickly raised, and the method is a novel quick construction mode. The Chinese patent with the application number of 201710468793.3 discloses a special gunning mix for a coal injection pipe, which adopts a combination mode mainly comprising calcium aluminate cement, has poor adhesion in the use process and high rebound rate, easily causes the waste of materials, is easy to fall off after being used for a period of time due to not good combination with the original castable, and has short service life. And the material strength is greatly fluctuated by the change of temperature, and the application in the aspect of hot spray repair construction is limited to a certain extent.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a dry spray coating for a coal injection pipe and a preparation method thereof, and the prepared spray coating has the advantages of high strength, good volume stability, excellent thermal shock resistance, strong alkali resistance and wear resistance, good adhesion, low rebound rate, high hardening speed, convenient construction, no need of formwork erection and maintenance, high construction speed, labor saving, time saving, labor saving and the like, and the overhaul and maintenance time of the coal injection pipe for a cement kiln is greatly shortened.
In order to solve the technical problems, the invention provides a dry spray coating for a coal injection pipe, which comprises the following components in parts by weight:
preferably, the andalusite comprises two specifications of 3-5mm and 1-3mm, and the weight parts of the various specifications are as follows:
8-12 parts of 3-5mm andalusite
10-15 parts of 1-3mm andalusite.
Preferably, Al in the andalusite2O3Is not in mass percentLess than 56%.
Preferably, the silicon carbide particles comprise two specifications of 1-3mm and 0-1mm, and the silicon carbide particles comprise the following components in parts by weight:
22-32 parts of 1-3mm silicon carbide particles
18-25 parts of 0-1mm silicon carbide particles.
Preferably, the mass percentage content of SiC in the silicon carbide particles is not less than 95%.
Preferably, the mass percentage content of SiC in the silicon carbide powder is not less than 95%.
Preferably, Al in the calcium aluminate cement2O3The mass percentage of (A) is not less than 68%.
A preparation method of a dry spray coating for a coal injection pipe comprises the following preparation processes: the raw materials are mixed according to a certain proportion, then uniformly mixed, added into a spraying machine, and applied by a dry spraying method, and water is added at the outlet of a spray gun of the spraying machine.
Preferably, the amount of water added at the spray gun outlet of the spraying machine is 8-12 parts.
The invention has the beneficial effects that: the invention selects the raw materials with excellent thermal shock resistance such as andalusite, silicon carbide and the like as main materials, selects the alumina powder and soft clay to improve the bonding property and plasticity of the spray coating, uses the aluminum dihydrogen phosphate dry powder as a bonding agent, uses the calcium aluminate cement and the calcium lignosulfonate as a composite hardening accelerator, uses the metal aluminum powder as an explosion-proof agent, adopts the dry spraying method for construction, and the prepared spray coating has the advantages of high strength, good volume stability, excellent thermal shock resistance, strong alkali resistance and wear resistance, good adhesion, low rebound rate, high hardening speed, convenient construction, no need of erecting a mold and maintenance, high construction speed, labor saving, time saving, labor saving and the like, greatly shortens the overhaul and maintenance time of the coal spraying pipe for the cement kiln, is favorable for reducing the construction cost, can be well applied particularly under the condition of short rush repair and kiln shutdown time, and overcomes the low external environment temperature in the north, the difficult problem that the service life of the castable is affected by freezing can occur during direct pouring, and the spray coating can minimize the influence and is more suitable for the use condition and the construction condition of a coal injection pipe, so that the spray coating has great promotion effect on improving the capacity and the benefit of a cement kiln.
Detailed Description
Example 1
A dry spray coating for a coal injection pipe comprises the following components in parts by weight:
wherein Al in the andalusite2O3The mass percentage content of (A) is not less than 56%; the mass percentage content of SiC in the silicon carbide particles is not less than 95%; the mass percentage of SiC in the silicon carbide powder is not less than 95%; al in the calcium aluminate cement2O3Is not less than 68 percent.
The preparation process of the dry spray coating for the coal injection pipe comprises the following steps: the raw materials are mixed according to a certain proportion, then are uniformly mixed, and are added into a spraying machine for construction application by adopting a dry spraying method, and water is added into an outlet of a spray gun of the spraying machine, wherein the water addition amount is 10 parts.
Example 2
A dry spray coating for a coal injection pipe comprises the following components in parts by weight:
wherein Al in the andalusite2O3The mass percentage content of (A) is not less than 56%; the mass percentage of SiC in the silicon carbide particles is not less than 95 percent; what is neededThe mass percentage of SiC in the silicon carbide powder is not less than 95 percent; al in the calcium aluminate cement2O3Is not less than 68 percent.
The preparation process of the dry spray coating for the coal injection pipe comprises the following steps: the raw materials are mixed according to a certain proportion, then uniformly mixed, added into a spraying machine, and applied by a dry spraying method, and water is added into an outlet of a spray gun of the spraying machine, wherein the water addition amount is 12 parts.
Example 3
A dry spray coating for a coal injection pipe comprises the following components in parts by weight:
wherein Al in the andalusite2O3The mass percentage content of (A) is not less than 56%; the mass percentage of SiC in the silicon carbide particles is not less than 95 percent; the mass percentage of SiC in the silicon carbide powder is not less than 95%; al in the calcium aluminate cement2O3Is not less than 68 percent.
The preparation process of the dry spray coating for the coal injection pipe comprises the following steps: the raw materials are mixed according to a certain proportion, then are uniformly mixed, and are added into a spraying machine for construction application by adopting a dry spraying method, and water is added into an outlet of a spray gun of the spraying machine, wherein the water addition amount is 8 parts.
Example 4
A dry spray coating for a coal injection pipe comprises the following components in parts by weight:
wherein Al in the andalusite2O3The mass percentage content of (A) is not less than 56%; in the silicon carbide particlesThe mass percentage content of SiC is not less than 95 percent; the mass percentage of SiC in the silicon carbide powder is not less than 95%; al in the calcium aluminate cement2O3Is not less than 68 percent.
The preparation process of the dry spray coating for the coal injection pipe comprises the following steps: the raw materials are mixed according to a certain proportion, then uniformly mixed, added into a spraying machine, and applied by a dry spraying method, and water is added into an outlet of a spray gun of the spraying machine, wherein the water addition amount is 12 parts.
Example 5
A dry spray coating for a coal injection pipe comprises the following components in parts by weight:
wherein Al in the andalusite2O3The mass percentage content of (A) is not less than 56%; the mass percentage of SiC in the silicon carbide particles is not less than 95 percent; the mass percentage of SiC in the silicon carbide powder is not less than 95%; al in the calcium aluminate cement2O3Is not less than 68 percent.
The preparation process of the dry spray coating for the coal injection pipe comprises the following steps: the raw materials are mixed according to a certain proportion, then uniformly mixed, added into a spraying machine, and applied by a dry spraying method, and water is added into an outlet of a spray gun of the spraying machine, wherein the water addition amount is 11 parts.
The properties of the dry type spray paint for a coal injection pipe prepared in the above examples 1 to 5 were as follows:
according to the performance indexes, the dry spray coating for the coal injection pipe, which is prepared by the invention, has the advantages of good performance, high strength, good volume stability and excellent thermal shock resistance.
The invention selects the raw materials with excellent thermal shock resistance such as andalusite, silicon carbide and the like as main materials, selects the alumina powder and soft clay to improve the bonding property and plasticity of the spray coating, uses the aluminum dihydrogen phosphate dry powder as a bonding agent, uses the calcium aluminate cement and the calcium lignosulfonate as a composite hardening accelerator, uses the metal aluminum powder as an explosion-proof agent, adopts the dry spraying method for construction, and the prepared spray coating has the advantages of high strength, good volume stability, excellent thermal shock resistance, strong alkali resistance and wear resistance, good adhesion, low rebound rate, high hardening speed, convenient construction, no need of erecting a mold and maintenance, high construction speed, labor saving, time saving, labor saving and the like, greatly shortens the overhaul and maintenance time of the coal spraying pipe for the cement kiln, is favorable for reducing the construction cost, can be well applied particularly under the condition of short rush repair and kiln shutdown time, and overcomes the low external environment temperature in the north, the difficult problem that the service life of the castable is affected by freezing can occur during direct pouring, and the spray coating can minimize the influence and is more suitable for the use condition and the construction condition of a coal injection pipe, so that the spray coating has great promotion effect on improving the capacity and the benefit of a cement kiln.
The above description is illustrative and not restrictive. Many modifications and variations of the present invention will be apparent to those skilled in the art in light of the above teachings, which will fall within the spirit and scope of the invention.
Claims (7)
1. The dry type spray coating for the coal injection pipe is characterized by comprising the following components in parts by weight:
18-27 parts of andalusite
Silicon carbide particles 40-57 parts
8-15 parts of silicon carbide powder
10-15 parts of alumina powder
4-8 parts of aluminum dihydrogen phosphate dry powder
3-6 parts of soft clay
1-2 parts of calcium aluminate cement
1-2 parts of calcium lignosulphonate
0.005-0.01 part of metal aluminum powder;
the andalusite comprises two specifications of 3-5mm and 1-3mm, and the parts by weight of each specification are as follows:
8-12 parts of 3-5mm andalusite
10-15 parts of 1-3mm andalusite;
the silicon carbide particles comprise two specifications of 1-3mm and 0-1mm, and the silicon carbide particles comprise the following components in parts by weight:
22-32 parts of 1-3mm silicon carbide particles
18-25 parts of 0-1mm silicon carbide particles.
2. The dry spray paint for a coal injection pipe according to claim 1, wherein Al in andalusite is2O3Is not less than 56 percent.
3. The dry type spray coating material for a coal injection pipe according to claim 1, wherein the mass percentage content of SiC in the silicon carbide particles is not less than 95%.
4. The dry type spray coating for the coal injection pipe as claimed in claim 1, wherein the mass percentage content of SiC in the silicon carbide powder is not less than 95%.
5. The dry spray paint for a coal injection pipe as claimed in claim 1, wherein Al in the calcium aluminate cement2O3Is not less than 68 percent.
6. The method for preparing a dry type spray paint for a coal injection pipe according to claim 1, which comprises the following steps: the raw materials are mixed according to a certain proportion, then uniformly mixed, added into a spraying machine, and applied by a dry spraying method, and water is added at the outlet of a spray gun of the spraying machine.
7. The method of claim 6, wherein the amount of water added at the outlet of the lance of the coating machine is 8 to 12 parts.
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