CN113979763A - Coating for furnace and kiln and preparation method and application thereof - Google Patents
Coating for furnace and kiln and preparation method and application thereof Download PDFInfo
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- CN113979763A CN113979763A CN202111423762.9A CN202111423762A CN113979763A CN 113979763 A CN113979763 A CN 113979763A CN 202111423762 A CN202111423762 A CN 202111423762A CN 113979763 A CN113979763 A CN 113979763A
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
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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
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3208—Calcium oxide or oxide-forming salts thereof, e.g. lime
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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
- C04B2235/32—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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- 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
- C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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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
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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
- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
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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
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/52—Constituents or additives characterised by their shapes
- C04B2235/5208—Fibers
- C04B2235/5212—Organic
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- 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
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
Abstract
The invention relates to the technical field of metallurgy, in particular to a coating material for a furnace and a preparation method and application thereof. The coating material for the furnace and the kiln comprises raw materials of flint clay, alumina powder, silicon micropowder, a bonding agent, kyanite, a water reducing agent, a coagulant, an explosion-proof agent and a gel accelerating additive. The coating material can change the construction form according to different construction requirements of a furnace construction site, realizes that one material meets the requirements of various construction operation modes, and can meet the use requirements of the furnace due to the excellent performance. The material prepared by the method still keeps the advantages of better melt or gas erosion resistance, good smearing property, good adhesiveness with a protected material, good thermal shock stability and chemical stability, difficult cracking in use and long service life.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a coating material for a furnace and a preparation method and application thereof.
Background
Refractory coating materials are generally used for making linings when the use temperature is low, the structure is complex and the linings are thin, or refractory coating materials are also often used for making coatings when the use temperature is high and parts with special requirements are needed. However, most of the construction of the indefinite-shaped refractory materials is carried out by adopting a casting molding mode, and the defects in the prior art are that the construction of the casting material is not facilitated for the construction surface with larger angle and inclination, if the construction needs to be carried out, auxiliary equipment such as a mold and the like is additionally used for casting construction, and the materials are easy to crack and peel after high temperature.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention aims to provide a coating for furnaces and kilns, a preparation method and a use thereof, which are used for solving the problems in the prior art.
In order to achieve the above and other related objects, in one aspect, the present invention provides a coating material for a furnace kiln, which comprises the following components in parts by weight:
in some embodiments of the invention, the flint clay comprises 45-55 parts of flint clay particles and flint clay powder by weight of the raw material of the coating for the kiln; 12-18 parts of flint clay powder.
In some embodiments of the invention, the flint clay particles are of continuous gradation, with a particle size specification of 5-3mm, 3-1mm, 1-0 mm; wherein the weight ratio of 5-3mm of flint clay particles, 3-1mm of flint clay particles and 1-0mm of flint clay particles is 1: 1.06: 1.33-1: 1.33: 1.92; the interval screening content of the flint clay particles is more than or equal to 85 wt%, and Al in the flint clay particles2O3Content is more than or equal to 45 wt%, Fe2O3The content is less than or equal to 2.5wt percent.
In some embodiments of the invention, the flint clay powder has a particle size of 180 mesh to 200 mesh; wherein Al in the flint clay powder2O3The content is more than or equal to 45wt percent.
In the inventionIn some embodiments, the alumina powder has a particle size of 180-200 mesh; wherein Al in the bauxite powder2O3The content is more than or equal to 85wt percent.
In some embodiments of the invention, the alumina powder has a particle size of 800 mesh to 1.2 um; wherein Al in the alumina powder2O3Content (wt.)>98.5 wt%, and the total content of Fe and Si is less than or equal to 0.05 wt%, wherein Fe2O3The content is less than or equal to 0.03 wt%; SiO 22The content is less than or equal to 0.02wt percent.
In some embodiments of the invention, the SiO in the microsilica2The content is more than or equal to 92wt percent.
In some embodiments of the present invention, the particle size D50 of the microsilica is 1.2-2 um.
In some embodiments of the invention, the binder is selected from pure aluminate cements, wherein the aluminium content is >66 wt%.
In some embodiments of the invention, the kyanite has a particle size specification of 35 mesh to 65 mesh; al (Al)2O3The content is more than or equal to 59 wt%; fe2O3The content is less than or equal to 1.0wt percent.
In some embodiments of the invention, the water reducing agent is selected from sodium tripolyphosphate.
In some embodiments of the invention, the set accelerator is selected from slaked lime.
In some embodiments of the invention, the explosion suppressant is selected from organic fibers that are water soluble; preferably, the organic fiber has a length of 4 to 8 mm.
In some embodiments of the invention, the accelerating gel additive is selected from water glass solutions, preferably having a concentration of 10-15%.
In another aspect of the present invention, a preparation method of the coating for a furnace of the present invention includes: mixing flint clay, flint clay powder, alumina powder, silicon micropowder, a bonding agent, kyanite, a water reducing agent, a coagulant, an explosion-proof agent and a coagulant additive, and then mixing to prepare the coating material for the furnace and the kiln, which is added with the additive.
In some embodiments of the present invention, the mixing time is 170 to 200 seconds.
In a further aspect of the invention there is provided the use of a spread for a kiln according to the invention as hereinbefore described in a kiln.
Compared with the prior art, the invention has the beneficial effects that:
1. the material meets the requirements of different construction modes of the furnace kiln, and the construction method can be changed by adding the solution dissolved with the procoagulant agent in a certain proportion. I.e. one material with multiple uses: can be poured, smeared and sprayed.
2. The gelation-promoting admixture such as sodium silicate is introduced to be mixed and stirred with water in a reasonable proportion to prepare a water glass solution), so that the construction performance of the material is changed, the difference between the strength index of the material and the original castable index is not large, the strength requirement is met, and meanwhile, the material continuously keeps the erosion resistance of a coating material to a molten body or gas, good coating property, plasticity, the adhesiveness with a protected material, good thermal shock stability and chemical stability; the cracking and the peeling are not easy to occur in use. The prepared novel coating material has good material performance, long service life and application effect.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments, and other advantages and effects of the present invention will be apparent to those skilled in the art from the disclosure of the present specification.
Through a large number of exploration experiments, the inventor provides the coating for the furnace and the kiln, which is added with the additive, and the coating for the furnace and the kiln has better melt or gas erosion resistance, good coating property, good adhesiveness with a protected material, good thermal shock stability and chemical stability. Is not easy to crack and peel off in use. By adding the solution dissolved with the accelerating gel admixture in a certain proportion and adding the solution according to the normal water adding ratio, the construction form can be changed according to different construction requirements, one material can meet the requirements of various construction operation modes, and the use requirements of furnaces and kilns can be met due to the excellent performance of the material. On the basis of this, the present invention has been completed.
The invention provides a coating material for a furnace kiln, which comprises the following raw materials in parts by weight:
the coating material for the furnace and the kiln, provided by the invention, can comprise 57-73 parts, 57-62 parts, 62-67 parts, 67-73 parts, 57-60 parts, 60-63 parts, 63-66 parts, 66-70 parts or 70-73 parts of flint clay by weight. The flint clay is typically a hard clay whose major chemical constituent typically includes Al2O3And SiO2The two oxides may also include impurities such as alkali, alkaline earth, and oxides of iron, titanium, etc. The flint clay may generally function to provide strength and refractoriness to the furnace coating. The flint clay comprises flint clay particles and flint clay powder.
The coating material for the furnace kiln provided by the invention can comprise 45-55 parts, 45-50 parts, 50-55 parts, 45-48 parts, 48-50 parts, 50-52 parts or 52-55 parts of flint clay particles by weight. The particle size specification of the flint clay particles is usually continuous gradation, and specifically, the particle size specifications of the flint clay particles are 5-3mm, 3-1mm and 1-0mm (namely, the particle size is less than or equal to 1mm), wherein the weight ratio of the flint clay particles (5-3mm), the flint clay particles (3-1mm) and the flint clay particles (1-0mm) can be 1: 1.06: 1.33-1: 1.33: 1.92. the interval sieve content of the flint clay particles is usually more than or equal to 85 wt%. Al in the flint clay particles2O3The content is usually more than or equal to 42 wt%; preferably 44-45 wt%. Fe2O3The content is usually less than or equal to 2.5 wt%; preferably 1-2 wt%. In one embodiment, the flint clay particles are selected from flint clay 45 #.
The coating material for the furnace kiln provided by the invention can comprise 12-18 parts, 12-15 parts, 15-18 parts, 12-14 parts, 14-16 parts or 16-18 parts of flint clay powder by weight. The flint powder is typically a fine powder of flint ground. The invention is realized by mixing flint clay particles andflint clay powders are used together to reasonably optimize the material grading. The particle size of the flint clay powder is 180-200 meshes, 180-190 meshes, 190-200 meshes or the like. Wherein Al in the flint clay powder2O3The content is more than or equal to 42wt percent, and preferably 44 to 45wt percent.
The coating material for the furnace kiln provided by the invention can comprise 12-18 parts, 12-15 parts, 15-18 parts, 12-14 parts, 14-16 parts or 16-18 parts of flint clay powder by weight. In one embodiment, the flint clay powder is selected from flint clay powder 45 #.
The coating material added with the additive for the furnace and the kiln provided by the invention comprises, by weight, 4-8 parts, 4-6 parts, 6-8 parts, 4-5 parts, 5-6 parts, 6-7 parts or 7-8 parts of bauxite powder. The bauxite powder is fine powder prepared by processing calcined bauxite ore by a Raymond mill, and belongs to a novel silicon-aluminum series high-grade refractory material. The bauxite powder is ultrafine powder ground by bauxite, and the bauxite sand has small expansion coefficient, high refractoriness, good chemical stability, low impurity content and high alumina content. The bauxite powder has the functions of supplementing and increasing the aluminum content in the material, and through refractoriness, the bauxite powder is stable in chemical components, low in impurity content, not easy to shrink and deform at a high temperature state, and capable of improving stability. The bauxite powder can have a particle size of 180-200 meshes, 180-190 meshes, 190-200 meshes, or the like. Wherein Al in the bauxite powder2O3The content is more than or equal to 80 percent, and is preferably 83 to 85 percent. In one embodiment, the alumina powder is selected from 85% alumina powder, wherein 85% alumina powder refers to Al in the alumina powder2O3The content is more than or equal to 84 percent.
The coating material for the furnace and the kiln, provided by the invention, can comprise 12-15 parts, 12-13 parts, 13-14 parts or 14-15 parts of alumina powder by weight. The alumina powder has the characteristics of high melting point, good thermal stability, high hardness, good wear resistance, high mechanical strength, good electrical insulation, corrosion resistance and the like, and has strong effects of improving the high-temperature strength of the refractory material and improving the erosion resistance of the material.
In some embodiments, the particle size of the alumina powder can be 1-1.2um, 1-1.1um, or 1.1-1.2um, and the like. Preferably 1.2 um. Wherein Al in the alumina powder2O3The content is more than or equal to 98.5wt percent, preferably 98.9-99.5wt percent; the total content of Fe and Si is less than or equal to 0.05 wt%, wherein Fe2O3≤0.03％；SiO2≤0.02％。
The coating material for the furnace kiln provided by the invention can comprise 4-8 parts, 4-5 parts, 5-6 parts, 6-7 parts or 7-8 parts of silicon micropowder by weight. The silica powder is also called quartz powder, quartz sand and the like, and generally refers to a hard, wear-resistant and chemically stable silicate mineral, and the main mineral component of the silicate mineral is generally SiO2. The silicon micro powder can generally play a role in improving the construction performance of the material and the medium-high temperature strength of the material in the coating material added with the additive for the furnace and the kiln. SiO in the silicon micro powder2The content is usually more than or equal to 92 wt%, and the grain diameter D50 of the silicon micropowder is 1.2-2um, 1.2-1.6um, 1.6-2um, 1.2-1.4um, 1.4-1.6um, 1.6-1.8um, or 1.8-2.0um, etc. The type of the silicon micro powder can be 920U.
The coating material for the furnace kiln provided by the invention can comprise 4-8 parts, 4-6 parts, 6-8 parts, 4-5 parts, 5-6 parts, 6-7 parts or 7-8 parts of bonding agent by weight. In some embodiments, the binding agent is selected from pure aluminate cement. The aluminum content is > 66%. The 3-day compressive strength can be 50-60Mpa, 50-55Mpa, or 55-60Mpa, etc. The 3-day flexural strength can be 8-10Mpa, 8-9Mpa, or 9-10Mpa, etc. The pure aluminate cement has the characteristics of high hardening speed, high medium-temperature strength, high refractoriness and the like.
The coating material for the furnace and the kiln, provided by the invention, can comprise 5-10 parts, 5-8 parts, 8-10 parts, 5-6 parts, 6-7 parts, 7-8 parts, 8-9 parts or 9-10 parts of kyanite by weight. Kyanite is a natural refractory raw material mineral with high refractoriness and large high-temperature volume expansion, and parallel stripes are arranged on crystal faces of kyanite, and the kyanite is light blue or cyan, bright grey and the like. The kyanite can generally play a role in eliminating shrinkage cracks, peeling and weak points influencing the service life of an unshaped refractory material in the coating material for the furnace kiln during high temperature and cooling processes, thereby prolonging the service life of the material. The kyanite has a particle size of 35-65 mesh, 35-45 mesh, 45-55 mesh, or 55-65 mesh. In kyanite, Al2O3The content is more than or equal to 59 wt%; fe2O3The content is less than or equal to 1.0wt percent.
The coating material for the furnace kiln provided by the invention can comprise 0.3-0.8 part, 0.3-0.5 part, 0.5-0.8 part, 0.3-0.4 part, 0.4-0.5 part, 0.5-0.6 part, 0.6-0.7 part or 0.7-0.8 part of water reducing agent by weight part. In some embodiments, the water reducing agent is selected from sodium tripolyphosphate. Compared with other water reducing agents, the sodium tripolyphosphate has the advantages of good universality and low price.
The coating material for the furnace kiln provided by the invention can comprise 0.01-0.025 parts, 0.01-0.015 parts, 0.015-0.02 parts or 0.02-0.025 parts of coagulant by weight. In some embodiments, the set accelerator is selected from slaked lime. Compared with other coagulation accelerators, the slaked lime has the advantages of high alkalinity, quick coagulation acceleration and low price.
The coating material for the furnace kiln provided by the invention can comprise 0.05-0.12 part, 0.05-0.08 part, 0.08-0.12 part, 0.05-0.06 part, 0.06-0.07 part, 0.07-0.08 part, 0.08-0.09 part, 0.09-0.1 part, 0.1-0.11 part or 0.11-0.12 part of explosion-proof agent by weight part. In some embodiments, the explosion suppressant is selected from organic fibers. The organic fiber is fiber made of organic matters, and includes terylene, acrylon, chinlon, polypropylene fiber, and high-performance fiber including aramid fiber, ultra-high molecular weight polyethylene fiber (UHMWPE fiber), poly-p-phenylene benzobisoxazole fiber (PBO fiber), poly-p-benzimidazole fiber (PBI fiber), poly-phenylene pyridobisimidazole fiber (M5 fiber), polyimide fiber (PI fiber), etc. The organic fiber is water-soluble; the organic fibers are preferably selected from polyvinyl alcohol fibers. More preferably, the organic fiber has a length of 4 to 8mm, 4 to 6mm, or 6 to 8mm, or the like. Compared with other explosion-proof agents, the organic fiber has the advantages of good dispersibility, non-adhesion, good dispersibility in water, good affinity with cement and the like, high bonding strength, low melting point, easy water vapor discharge and anti-explosion effect, and forms a tiny air passage in the material at 120 ℃.
The coating material for the furnace kiln provided by the invention can comprise 3-5 parts, 3-4 parts or 4-5 parts of the procoagulant admixture by weight. The gel-promoting admixture is selected from water glass solution, and the water glass solution can be prepared by mixing and stirring sodium silicate and water. In some embodiments, the concentration of the water glass solution is 10-15%. The adding amount of the water glass solution is 3-5 parts. Compared with other gel-promoting admixtures, the water glass solution selected as the gel-promoting admixture has the advantages that the water glass solution has strong bonding strength, and the silicic acid sol is dehydrated by adopting a drying and heating method to cause gelation to play a bonding role, so that the material strength is improved.
In a specific embodiment, the coating material for the furnace kiln comprises the following raw materials in parts by weight:
the second aspect of the present invention provides a method for producing the coating material for a furnace according to the first aspect of the present invention, and a person skilled in the art can prepare the coating material for a furnace with an additive added thereto by using the formulation of the coating material for a furnace with an additive added thereto according to the first aspect of the present invention by an appropriate method. For example, the preparation method may be physical mixing, and specifically may include: the components are mixed in the formula provided by the first aspect of the invention. More specifically, the coating material for the furnace and the kiln, which is added with the admixture, is prepared by mixing and then mixing flint clay, alumina powder, silicon micropowder, a bonding agent, kyanite, a water reducing agent, a coagulant, an explosion-proof agent and a coagulant admixture. The mixing time may be, for example, 170-.
More specifically, in one embodiment, the preparation method comprises:
1. setting a formula on a main control console; weighing water reducing agent, coagulant and small explosion-proof agent.
2. Starting the metering equipment, accurately weighing each material to the intermediate weighing bin, and then entering a conveying system;
3. the mixture enters a mixing roll for mixing through a conveying system and a lifting hopper, and small materials are put in through a small material feeding port for mixing, wherein the mixing time is 170 plus 200 seconds;
4. after mixing, the mixture is packaged by a ton bag and stacked by a packaging system.
5. And (4) metering the accelerating gel additive, packaging and stacking.
A third aspect of the invention provides the use of a spread for a kiln according to the first aspect of the invention in a kiln.
The invention is characterized in that aggregate, powder and admixture with smaller particles are adopted, for example, the aggregate, the powder and the admixture can be prepared into a casting material form by proper water adding ratio according to a certain proportion, and the casting material has good flowing property; for example, the solution dissolved with a certain proportion of the procoagulant agent is added according to a proper water adding proportion, so that the pouring material with fluidity is changed into a coating form, thereby changing the construction performance of the material, and meanwhile, the solution with a certain proportion of the procoagulant agent can be used by combining the channel of the spray gun muzzle water adding pipe of the spraying machine and the material for spraying, thereby achieving the purpose of spraying operation. The material loses the flowing property and has good plasticity and adsorption property.
The concrete effects are as follows:
1. the material meets the requirements of different construction modes of the furnace kiln, and the construction method can be changed by adding the solution dissolved with the procoagulant agent in a certain proportion. I.e. one material with multiple uses: can be poured, smeared and sprayed.
2. By introducing the gel accelerating admixture (for example, sodium silicate and water with a reasonable proportion are mixed and stirred to prepare a water glass solution), the construction performance of the material is changed, the strength index of the material is not greatly different from the original castable index, the strength requirement is met, and meanwhile, the material continuously keeps the erosion resistance of a coating material or gas, good coating property, plasticity, adhesiveness with a protected material, good thermal shock stability and chemical stability; the cracking and the peeling are not easy to occur in use. The prepared novel coating material has good material performance, long service life and application effect.
The following examples are provided to further illustrate the advantageous effects of the present invention.
In order to make the objects, technical solutions and advantageous technical effects of the present invention more clear, the present invention is further described in detail below with reference to examples. However, it should be understood that the embodiments of the present invention are only for explaining the present invention and are not for limiting the present invention, and the embodiments of the present invention are not limited to the embodiments given in the specification. The examples were prepared under conventional conditions or conditions recommended by the material suppliers without specifying specific experimental conditions or operating conditions.
Furthermore, it is to be understood that one or more method steps mentioned in the present invention does not exclude that other method steps may also be present before or after the combined steps or that other method steps may also be inserted between these explicitly mentioned steps, unless otherwise indicated; it is also to be understood that a combined connection between one or more devices/apparatus as referred to in the present application does not exclude that further devices/apparatus may be present before or after the combined device/apparatus or that further devices/apparatus may be interposed between two devices/apparatus explicitly referred to, unless otherwise indicated. Moreover, unless otherwise indicated, the numbering of the various method steps is merely a convenient tool for identifying the various method steps, and is not intended to limit the order in which the method steps are arranged or the scope of the invention in which the invention may be practiced, and changes or modifications in the relative relationship may be made without substantially changing the technical content.
In the following examples, reagents, materials and instruments used are commercially available unless otherwise specified.
Organic fibers from Liaoyang Jintai chemical fibers Co Ltd
The silicon micropowder is purchased from Shanghai sky happy silicon powder materials Co., Ltd
The water glass solution is prepared by mixing sodium silicate and water, and is available from Luan inorganic silicide Co.
The raw material formulation ratios of the respective samples in examples are shown in Table 1
TABLE 1
Setting a formula on a main control console according to a process flow; and weighing the dispersing agent, the water reducing agent and the coagulant small material. Starting the metering equipment, accurately weighing each material to the intermediate weighing bin, and then entering a conveying system; the mixture enters a mixing roll for mixing through a conveying system and a lifting hopper, and small materials are put in through a small material feeding port for mixing, wherein the mixing time is 180 seconds; after mixing, the mixture is packaged by a ton bag and stacked by a packaging system. Metering accelerating gel additive and stacking.
The above examples were mixed with sodium silicate to obtain a 15% strength water glass solution by adding a certain proportion of a gel-promoting admixture, i.e. by adding a suitable amount of water. Comparative examples 1, 2 and 3 were measured and compared for volume density, linear change rate, flexural strength and compressive strength without addition of a gel accelerating admixture. The test results are shown in table 2:
TABLE 2
The rebound resilience detection method comprises the following steps: fixing a spray paint die (the length is 450-900 mm, the width is 150-300 mm) on a corresponding sprayed wall surface, laying a collecting film below the sprayed surface (the distance between the lower edge of the spray paint die and the collecting film is 0.5-2 m), wherein the spray paint track sprayed by a spray gun on the corresponding spray paint die is in spiral elliptical motion, the long axis of a coil is 100-200 mm, the last coil presses 1/3-1/2 of the previous coil, the quality of the rebound spray paint is obtained through the collecting film, and the rebound rate is obtained according to the formula (1) and the formula (2): wr＝W2/(Ws+W2) 100% of formula (1); ws ═ W1-WpFormula (2); wherein Wr is the rebound resilience; ws is the quality of the spray paint in the spray paint die; wpThe mass of the spray coating die before spraying; w1The total mass of the mold for spraying the coating after spraying; w2The mass of the rebound spray coating is shown. The mass unit is kg.
From the results in Table 2, compared with the comparative examples, the performance indexes of the invention meet the standard requirements after the gel accelerating admixture dissolved in a certain proportion is added, and the strength indexes are better.
In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. The coating material for the furnace kiln comprises the following raw materials in parts by weight:
2. the coating for a furnace kiln as claimed in claim 1, wherein the flint clay comprises flint clay particles and flint clay powder, and the flint clay particles are 45-55 parts by weight of the raw material of the coating for a furnace kiln; 12-18 parts of flint clay powder.
3. The coating for a furnace or kiln as claimed in claim 2, wherein the flint clay particles are of continuous gradation, having a particle size of 5-3mm, 3-1mm,1-0 mm; wherein the weight ratio of 5-3mm of flint clay particles, 3-1mm of flint clay particles and 1-0mm of flint clay particles is 1: 1.06: 1.33-1: 1.33: 1.92; the interval screening content of the flint clay particles is more than or equal to 85 wt%, and Al in the flint clay particles2O3Content is more than or equal to 45 wt%, Fe2O3The content is less than or equal to 2.5wt percent.
4. The spread for a furnace according to claim 1, wherein the particle size of the flint clay powder is 180 to 200 mesh; wherein Al in the flint clay powder2O3The content is more than or equal to 45wt percent.
5. The spread for a furnace according to claim 1, wherein the alumina powder has a particle size of 180 to 200 meshes; wherein Al in the bauxite powder2O3The content is more than or equal to 85wt percent.
6. The spread for a furnace kiln according to claim 1, wherein the particle size of the alumina powder is 800 mesh to 1.2 um; wherein Al in the alumina powder2O3Content (wt.)>98.5 wt%, and the total content of Fe and Si is less than or equal to 0.05 wt%, wherein Fe2O3The content is less than or equal to 0.03 wt%; SiO 22The content is less than or equal to 0.02wt percent.
7. The coating for a furnace kiln as claimed in claim 1, further comprising any one or more of the following technical conditions:
A1) SiO in the micro silicon powder2The content is more than or equal to 92 wt%;
A2) the particle size D50 of the micro silicon powder is 1.2-2 um;
A3) the binder is selected from pure aluminate cements, wherein the aluminum content is >66 wt%;
A4) the particle size specification of the kyanite is 35-65 meshes; al (Al)2O3The content is more than or equal to 59 wt%; fe2O3The content is less than or equal to 1.0 wt%;
A5) the water reducing agent is selected from sodium tripolyphosphate;
A6) the set accelerator is selected from slaked lime;
A7) the explosion-proof agent is selected from organic fibers which are water-soluble; preferably, the length of the organic fiber is 4-8 mm;
A8) the gel-promoting admixture is selected from water glass solution, and preferably, the concentration of the water glass solution is 10-15%.
8. The method for preparing a spread for a furnace or kiln according to claims 1 to 7, comprising: mixing flint clay, alumina powder, silicon micropowder, a bonding agent, kyanite, a water reducing agent, a coagulant, an explosion-proof agent and a gel accelerating additive, and then mixing to prepare the coating material for the furnace and the kiln, which is added with the additive.
9. The method for producing the spread for a furnace according to claim 8, wherein the kneading time is 170 to 200 seconds.
10. Use of a spread for a furnace according to any of claims 1-7 in a furnace.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115385701A (en) * | 2022-08-12 | 2022-11-25 | 河南瑞泰耐火材料科技有限公司 | Non-ferrous smelting anode furnace oxygen blowing and reducing agent blowing pipe coating material and preparation method thereof |
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| CN103588491A (en) * | 2013-11-08 | 2014-02-19 | 贵阳联合高温材料有限公司 | High-strength baking-free flint clay-mullite spray coating as well as preparation and using methods thereof |
| CN103979987A (en) * | 2014-05-20 | 2014-08-13 | 湖州浙宝冶金辅料有限公司 | Hot wear-resisting and alkali-resistant spray coating for limekiln linings and preparation method of spray coating |
| CN106083080A (en) * | 2016-06-08 | 2016-11-09 | 上海彭浦特种耐火材料厂有限公司 | High strength and low cost is high temperature resistant coating and preparation method |
| CN111004044A (en) * | 2019-12-26 | 2020-04-14 | 上海宝九和耐火材料有限公司 | Lightweight refractory castable for petrochemical industry |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103588491A (en) * | 2013-11-08 | 2014-02-19 | 贵阳联合高温材料有限公司 | High-strength baking-free flint clay-mullite spray coating as well as preparation and using methods thereof |
| CN103979987A (en) * | 2014-05-20 | 2014-08-13 | 湖州浙宝冶金辅料有限公司 | Hot wear-resisting and alkali-resistant spray coating for limekiln linings and preparation method of spray coating |
| CN106083080A (en) * | 2016-06-08 | 2016-11-09 | 上海彭浦特种耐火材料厂有限公司 | High strength and low cost is high temperature resistant coating and preparation method |
| CN111004044A (en) * | 2019-12-26 | 2020-04-14 | 上海宝九和耐火材料有限公司 | Lightweight refractory castable for petrochemical industry |
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| CN115385701A (en) * | 2022-08-12 | 2022-11-25 | 河南瑞泰耐火材料科技有限公司 | Non-ferrous smelting anode furnace oxygen blowing and reducing agent blowing pipe coating material and preparation method thereof |
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