CN115403362B - High-strength explosion-proof castable for secondary lead converter mouth and preparation method thereof - Google Patents
High-strength explosion-proof castable for secondary lead converter mouth and preparation method thereof Download PDFInfo
- Publication number
- CN115403362B CN115403362B CN202211071360.1A CN202211071360A CN115403362B CN 115403362 B CN115403362 B CN 115403362B CN 202211071360 A CN202211071360 A CN 202211071360A CN 115403362 B CN115403362 B CN 115403362B
- Authority
- CN
- China
- Prior art keywords
- weight percent
- explosion
- less
- proof
- content
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- C04B35/10—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 based on aluminium oxide
- C04B35/101—Refractories from grain sized mixtures
- C04B35/106—Refractories from grain sized mixtures containing zirconium oxide or zircon (ZrSiO4)
-
- 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
- C04B35/10—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 based on aluminium oxide
- C04B35/101—Refractories from grain sized mixtures
- C04B35/105—Refractories from grain sized mixtures containing chromium oxide or chrome ore
-
- 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
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
-
- 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
- C04B2235/3201—Alkali metal oxides or oxide-forming salts thereof
- C04B2235/3203—Lithium oxide or oxide-forming salts thereof
-
- 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
-
- 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
- C04B2235/3222—Aluminates other than alumino-silicates, e.g. spinel (MgAl2O4)
-
- 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
- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3232—Titanium oxides or titanates, e.g. rutile or anatase
-
- 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
-
- 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
-
- 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
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5427—Particle size related information expressed by the size of the particles or aggregates thereof millimeter or submillimeter sized, i.e. larger than 0,1 mm
-
- 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
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5436—Particle size related information expressed by the size of the particles or aggregates thereof micrometer sized, i.e. from 1 to 100 micron
-
- 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
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
-
- 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
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9669—Resistance against chemicals, e.g. against molten glass or molten salts
-
- 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
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Ceramic Products (AREA)
Abstract
The invention particularly relates to a high-strength explosion-proof castable for a secondary lead converter mouth and a preparation method thereof. The raw materials comprise the following components in percentage by weight: aggregate: 12-28 wt% of electric smelting sub-white corundum with the thickness of 5-3 mm, 20-35 wt% of electric smelting sub-white corundum with the thickness of 3-1 mm and 6-12 wt% of low-chromium frit with the thickness of 3-0 mm; base material: 10 to 25 weight percent of electric melting sub-white corundum fine powder less than 0.088mm, 5 to 15 weight percent of desilication zirconium less than 0.044mm, 2 to 10 weight percent of aluminum titanate less than 0.044mm, 3 to 6 weight percent of lithium carbonate less than 0.044mm and 5 to 10 weight percent of aluminate cement; additive: 0.2 to 1.2 weight percent of polycarboxylate water reducer and 2 to 4 weight percent of composite explosion-proof agent. The castable has the characteristics of excellent thermal shock resistance, good erosion resistance, high strength, good wear resistance, good explosion resistance and the like.
Description
Technical Field
The invention belongs to the technical field of reclaimed lead converter mouth castable, and particularly relates to a high-strength explosion-proof castable for a reclaimed lead converter mouth and a preparation method thereof.
Background
The regenerated lead converter mouth has severe requirements on refractory materials due to the need of feeding and discharging and slag, and the refractory materials with good thermal shock resistance, good wear resistance, high strength and good explosion resistance are needed. The conventional refractory materials for the mouth of the secondary lead converter are common magnesia-chrome refractory bricks, and the problems of complex refractory bricks, inconvenient construction and construction, poor erosion resistance, poor wear-resisting and explosion-proof effects and the like are solved, so that development of a refractory castable which is convenient to construct, meets the working conditions of the mouth of the secondary lead converter, has good thermal shock resistance, erosion resistance and high strength is urgently needed.
At present, the furnace mouth of the secondary lead converter has large and frequent temperature fluctuation due to the reasons of repeated feeding, blowing, deslagging, stopping and the like, so that the heat shock resistance, the heat spalling resistance, the structural spalling resistance and the erosion resistance of the refractory material of the furnace mouth need to be improved, and the traditional refractory material is mainly a magnesia-chrome brick produced by synthesizing a co-sintered magnesia-chrome material. Cr-containing 2 O 3 The refractory material has a number of unique properties, but chromium-containing refractory materials are exposed to an oxidizing atmosphere and a strong alkaline substance such as Na 2 O、K 2 O, caO, etc., can be converted from trivalent chromium to hexavalent chromium in the presence of a significant amount. Hexavalent chromium compounds are readily soluble in water and CrO 3 Can exist in gas phase, belongs to highly toxic substances, is harmful to human body and severely pollutes environment. Therefore, in order to reduce and counteract the harm of hexavalent chromium, a great deal of experimental work is needed, trivalent chromium is restrained from being converted into hexavalent chromium, the use of chromium content is reduced, and a novel high-performance refractory material which can ensure the use performance and reduce the environmental pollution is developed.
Disclosure of Invention
The invention provides a high-strength explosion-proof castable for a secondary lead converter mouth and a preparation method thereof, which are used for reducing the chromium content in refractory materials. Meanwhile, the high-strength explosion-proof castable well inhibits part of trivalent chromium from being converted into hexavalent chromium, reduces the chromium content in the refractory material, and reduces the pollution of hexavalent chromium to the environment.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the high-strength explosion-proof castable for the converter mouth of the secondary lead converter comprises the following raw materials in percentage by weight:
aggregate: 12-28 wt% of electric smelting sub-white corundum with the thickness of 5-3 mm, 20-35 wt% of electric smelting sub-white corundum with the thickness of 3-1 mm and 6-12 wt% of low-chromium frit with the thickness of 3-0 mm;
base material: 10 to 25 weight percent of electric melting sub-white corundum fine powder less than 0.088mm, 5 to 15 weight percent of desilication zirconium less than 0.044mm, 2 to 10 weight percent of aluminum titanate less than 0.044mm, 3 to 6 weight percent of lithium carbonate less than 0.044mm and 5 to 10 weight percent of aluminate cement;
additive: 0.2 to 1.2 weight percent of polycarboxylate water reducer and 2 to 4 weight percent of composite explosion-proof agent.
The main chemical components of the electro-fused sub-white corundum are as follows: al (Al) 2 O 3 The content is more than or equal to 96 weight percent, fe 2 O 3 The content is less than or equal to 1 weight percent.
The main chemical components of the low-chromium frit are as follows: cr (Cr) 2 O 3 The content is 12 to 15 weight percent, the MgO content is 65 to 80 weight percent, and Fe 2 O 3 The content is less than or equal to 10 weight percent.
The main chemical components of the aluminum titanate are as follows: al (Al) 2 O 3 The content is 56-70 wt percent, tiO 2 The content is 30-44 wt% and the purity is more than 96%.
The main chemical components of the desilication zirconium are ZrO 2 The content is more than or equal to 98 weight percent.
Li in the lithium carbonate 2 CO 3 The content is more than 98.5 percent.
The aluminate cement is CA70 cement, and the main chemical component of the aluminate cement is Al 2 O 3 The content is more than or equal to 65 weight percent, and the CaO content is less than or equal to 30 weight percent.
The composite explosion-proof agent comprises the following specific components: 1-2 wt% of metal aluminum powder and 1-2 wt% of organic explosion-proof fiber, wherein the particle size of the metal aluminum powder is 40-60 mu m, and the purity is more than 99wt%.
The water reducer is a polycarboxylate water reducer, the pH value is 5-8, and the solid content is more than or equal to 95%.
The preparation method of the high-strength explosion-proof castable for the mouth of the secondary lead converter comprises the following steps:
according to the content of the aggregate and the matrix material, uniformly mixing the matrix material, adding the uniformly mixed matrix material into the aggregate, and uniformly mixing; and then adding 10-15 wt% of water into the mixture, stirring uniformly, vibrating and molding, curing for 12-24 hours at room temperature, and finally preserving heat for 24-36 hours at 80-120 ℃ to obtain the high-strength explosion-proof castable for the secondary lead converter mouth.
The beneficial effects of the invention are as follows:
1. compared with the traditional magnesia chrome brick, the high-strength explosion-proof castable has the advantages of simple process flow, convenient construction and obvious improvement on the anti-structural spalling property and the thermal shock resistance.
2. The high-strength explosion-proof castable adopts electro-fused sub-white corundum particles and low-chromium frit particles as aggregate, wherein Cr in the low-chromium frit particles 2 O 3 The content of Cr is 12-15 wt percent, compared with common magnesium-chromium frit 2 O 3 More than or equal to 20 percent, and reduces Cr in the material 2 O 3 The content reduces the pollution problem of hexavalent chromium.
3. The desilication zirconium powder is introduced into the high-strength explosion-proof castable, and ZrO is utilized 2 By ZrO 2 At Al 2 O 3 The micro-crack toughening effect in the material effectively improves the thermal shock resistance of the castable. Because the ore used in the secondary lead converter is sulfide ore, the atmosphere in the converter contains a large amount of SO 2 The gas and slag are mostly FeO-SiO 2 Slag system, the introduction of desilication zirconium powder is due to SiO 2 Easy FeO to form low-melting point solvent, on the other hand ZrO 2 In FeO-SiO 2 The solubility in the slag is small, and m-ZrO can be formed 2 +Al 2 O 3 +spinel eutectic, furthermore, zrO 2 The viscosity of slag is greatly improved, and a channel penetrated by slag is blocked, so that the structural peeling of the material is reduced, and the erosion resistance of the material is improved.
4. The aluminum titanate is introduced into the high-strength explosion-proof castable to inhibit the alkaline oxide from being converted into hexavalent chromium in the promotion of trivalent chromium; meanwhile, the metal aluminum powder is introduced to not only play a role of an explosion-proof agent, but also play a role of a reducing agent to prevent Cr 2 O 3 The oxide hexavalent chromium reduces the harm of hexavalent chromium and reduces the environmental pollution.
5. The high-strength explosion-proof castable is introduced into a composite explosion-proof agent, wherein a large amount of gas is generated in the process of reacting with water by the metal aluminum powder and is discharged through a certain channel, so that a large amount of open exhaust holes are formed, the air permeability of the castable is improved, and the thermal shock stability of the castable is improved; and the metal aluminum powder is compounded with the organic anti-explosion fiber, so that steam generated by heating is rapidly diffused in the baking process of the castable, and the problem of bursting caused by the fact that larger pressure is formed in the castable in a gathering way is avoided.
6. The high-strength explosion-proof castable adopts Li 2 CO 3 As an early strength agent, the low-temperature compressive strength of the castable can be improved by accelerating the hydration protective film to break so as to shorten the hydration induction period, and the construction strength is ensured, so that the construction process of the castable is more convenient and simpler.
Detailed Description
The following detailed description of the present invention is provided to facilitate understanding of the technical solution of the present invention, but is not intended to limit the scope of the present invention.
The high-strength explosion-proof castable for the converter mouth of the secondary lead converter in the following embodiment comprises the following raw materials in percentage by weight:
aggregate: 12-28 wt% of electric smelting sub-white corundum with the thickness of 5-3 mm, 20-35 wt% of electric smelting sub-white corundum with the thickness of 3-1 mm and 6-12 wt% of low-chromium frit with the thickness of 3-0 mm;
base material: 10 to 25 weight percent of electric melting sub-white corundum fine powder less than 0.088mm, 5 to 15 weight percent of desilication zirconium less than 0.044mm, 2 to 10 weight percent of aluminum titanate less than 0.044mm, and Li less than 0.044mm 2 CO 3 3 to 6 weight percent and 5 to 10 weight percent of aluminate cement;
additive: 0.2 to 1.2 weight percent of polycarboxylate water reducer and 2 to 4 weight percent of composite explosion-proof agent.
Composite explosion-proof agent composition: 1 to 2 weight percent of 40 to 60 mu m metal aluminum powder and 1 to 2 weight percent of organic explosion-proof fiber.
Uniformly mixing the matrix materials, adding the uniformly mixed matrix materials into the aggregate, and uniformly mixing; adding 10-15 wt% water, stirring, vibration molding, maintaining at room temperature for 12-24 hr, and maintaining at 80-120 deg.c for 24-36 hr to obtain the high strength explosion-proof castable for secondary lead converter mouth.
Example 1
The high-strength explosion-proof castable for the converter mouth of the secondary lead converter comprises the following raw materials in percentage by weight:
aggregate: 15wt% of electric smelting sub-white corundum with the thickness of 5-3 mm, 24wt% of electric smelting sub-white corundum with the thickness of 3-1 mm and 8wt% of low-chromium frit with the thickness of 3-0 mm;
base material: 25wt% of electric melting sub-white corundum fine powder less than 0.088mm, 10wt% of desilication zirconium less than 0.044mm, 10wt% of aluminum titanate less than 0.044mm, and Li less than 0.044mm 2 CO 3 3wt% of binder aluminate cement and 5wt% of cement;
additive: 1wt% of 40-60 mu m metal aluminum powder and 1wt% of organic explosion-proof fiber, and 0.5wt% of polycarboxylate water reducer.
Uniformly mixing the matrix materials, adding the uniformly mixed matrix materials into the aggregate, and uniformly mixing; adding 15wt% of water, stirring uniformly, vibrating and molding, curing for 20 hours at room temperature, and finally preserving heat for 32 hours at 100 ℃ to prepare the high-strength explosion-proof castable for the secondary lead converter mouth.
Example 2
The high-strength explosion-proof castable for the converter mouth of the secondary lead converter comprises the following raw materials in percentage by weight:
aggregate: 12wt% of 5-3 mm electro-fused sub-white corundum, 30wt% of 3-1 mm electro-fused sub-white corundum and 6wt% of 3-0mm low-chromium frit;
base material: 20wt% of electric melting sub-white corundum fine powder less than 0.088mm, 12wt% of desilication zirconium less than 0.044mm, 8wt% of aluminum titanate less than 0.044mm and Li less than 0.044mm 2 CO 3 5wt% of binder aluminate cement;
additive: 1.5wt% of 40-60 mu m metal aluminum powder and 2wt% of organic explosion-proof fiber, and 0.4wt% of polycarboxylate water reducer.
Uniformly mixing the matrix materials, adding the uniformly mixed matrix materials into the aggregate, and uniformly mixing; adding water with the weight percent of 14 percent, stirring uniformly, vibrating and molding, curing for 15 hours at room temperature, and finally preserving heat for 30 hours at the temperature of 90 ℃ to prepare the high-strength explosion-proof castable for the converter mouth of the secondary lead converter.
Example 3
The high-strength explosion-proof castable for the converter mouth of the secondary lead converter comprises the following raw materials in percentage by weight:
aggregate: 17wt% of 5-3 mm electro-fused sub-white corundum, 26wt% of 3-1 mm electro-fused sub-white corundum and 11wt% of 3-0mm low-chromium frit;
base material: 18wt% of electric melting sub-white corundum fine powder less than 0.088mm, 8wt% of desilication zirconium less than 0.044mm, 6wt% of aluminum titanate less than 0.044mm and Li less than 0.044mm 2 CO 3 4wt% of binder aluminate cement and 10wt% of cement;
additive: 1.2wt% of 40-60 mu m metal aluminum powder and 1.8wt% of organic explosion-proof fiber, and 0.6wt% of polycarboxylate water reducer.
Uniformly mixing the matrix materials, adding the uniformly mixed matrix materials into the aggregate, and uniformly mixing; adding 13wt% of water, stirring uniformly, vibrating and molding, curing for 18 hours at room temperature, and finally preserving heat for 36 hours at 120 ℃ to prepare the high-strength explosion-proof castable for the secondary lead converter mouth.
Example 4
The high-strength explosion-proof castable for the converter mouth of the secondary lead converter comprises the following raw materials in percentage by weight:
aggregate: 28wt% of electric smelting sub-white corundum with the thickness of 5-3 mm, 20wt% of electric smelting sub-white corundum with the thickness of 3-1 mm and 12wt% of low-chromium frit with the thickness of 3-0 mm;
base material: 15wt% of electric melting sub-white corundum fine powder less than 0.088mm, 5wt% of desilication zirconium less than 0.044mm, 5wt% of aluminum titanate less than 0.044mm and Li less than 0.044mm 2 CO 3 6wt% of binder aluminate cement 9wt%;
additive: 1wt% of 40-60 mu m metal aluminum powder and 1.6wt% of organic explosion-proof fiber, wherein the weight percentage of the total weight of the aggregate and the matrix is 1wt% of polycarboxylate water reducer.
Uniformly mixing the matrix materials, adding the uniformly mixed matrix materials into the aggregate, and uniformly mixing; adding 11wt% of water, stirring uniformly, vibrating and molding, curing for 24 hours at room temperature, and finally preserving heat for 36 hours at 120 ℃ to prepare the high-strength explosion-proof castable for the secondary lead converter mouth.
Example 5
The high-strength explosion-proof castable for the converter mouth of the secondary lead converter comprises the following raw materials in percentage by weight:
aggregate: 22wt% of electric smelting sub-white corundum with the thickness of 5-3 mm, 32wt% of electric smelting sub-white corundum with the thickness of 3-1 mm and 7wt% of low-chromium frit with the thickness of 3-0 mm;
13wt% of electric melting sub-white corundum fine powder less than 0.088mm, 15wt% of desilication zirconium less than 0.044mm, 2wt% of aluminum titanate less than 0.044mm and Li less than 0.044mm 2 CO 3 3wt% of binder aluminate cement and 6wt% of cement;
additive: 2wt% of 40-60 mu m metal aluminum powder and 1.5wt% of organic explosion-proof fiber, and 1.2wt% of polycarboxylate water reducer.
Uniformly mixing the matrix materials, adding the uniformly mixed matrix materials into the aggregate, and uniformly mixing; adding 10wt% of water, stirring uniformly, vibrating and molding, curing for 22 hours at room temperature, and finally preserving heat for 24 hours at 80 ℃ to prepare the high-strength explosion-proof castable for the secondary lead converter mouth.
Comparative example 1 magnesium chromium refractory
The raw materials comprise the following components in percentage by weight:
10wt% of 4-2 mm magnesite, 15wt% of less than 0.088mm magnesite, 55wt% of 4-0 mm high-chromium frit, 10wt% of 1-0 mm chromium concentrate, and 10wt% of less than 0.088mm chromium concentrate.
Comparative example 2 magnesium chromium refractory
The raw materials comprise the following components in percentage by weight:
15wt% of magnesite less than 0.088mm, 65wt% of 4-0 mm high-chromium clinker, 10wt% of chromium concentrate of 1-0 mm and 10wt% of chromium concentrate less than 0.088 mm.
Comparative example 3
The present embodiment is basically the same as embodiment 1, and the same points are not repeated, except that: in this comparative example 10wt% of the zirconium oxide < 0.044mm was replaced with 10wt% of zircon sand < 0.044 mm.
The raw material compositions of examples 1 to 5 and comparative examples 1 to 3 are shown in Table 1.
TABLE 1 raw materials composition Table
The data of the products prepared in examples 1 to 5 and comparative examples 1 to 3 are shown in Table 2.
Table 2 product correlation properties test data sheet
The indexes of the zircon sand added in comparative example 3 are not excellent, and particularly the difference in erosion resistance is very large, when the indexes of the desilicated zirconium added in example 1 are not excellent. Because the furnace gas atmosphere in the nonferrous smelting furnace contains a large amount of SO 2 The gas, slag is FeO-SiO2 slag system, siO 2 Is a solvent which is easy to form a low melting point with FeO, and the content of silicon in zircon sand is relatively high, so that the zircon sand is unsuitable for use, and ZrO in desilication zirconium is used 2 The purity is high, the structural stripping of the material can be reduced, and the thermal shock resistance is improved.
Compared with comparative example 1 and comparative example 2, the high-strength explosion-proof castable has the characteristics of excellent thermal shock resistance, structural spalling resistance, erosion resistance, high strength, good wear resistance and the like, can replace the traditional high-chromium-magnesium-chromium refractory, can meet the severe production environment of the mouth of a secondary lead converter, reduces the pollution of hexavalent chromium to the environment, and has good economic and social benefits.
The above-described embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention, so that all equivalent changes or modifications of the structure, characteristics and principles described in the claims should be included in the scope of the present invention.
Claims (8)
1. The high-strength explosion-proof castable for the mouth of the secondary lead converter is characterized by comprising the following raw materials in percentage by weight:
aggregate: 12-28 wt% of electric smelting sub-white corundum with the thickness of 5-3 mm, 20-35 wt% of electric smelting sub-white corundum with the thickness of 3-1 mm and 6-12 wt% of low-chromium frit with the thickness of 3-0 mm; al in the electro-fused sub-white corundum 2 O 3 The content is more than or equal to 96 weight percent, fe 2 O 3 The content is less than or equal to 1 weight percent; cr in the low-chromium frit 2 O 3 12 to 15 weight percent of MgO, 65 to 80 weight percent of Fe 2 O 3 The content is less than or equal to 10wt%;
base material: 10 to 25 weight percent of electric melting sub-white corundum fine powder less than 0.088mm, 5 to 15 weight percent of desilication zirconium less than 0.044mm, 2 to 10 weight percent of aluminum titanate less than 0.044mm, 3 to 6 weight percent of lithium carbonate less than 0.044mm and 5 to 10 weight percent of aluminate cement;
additive: 0.2 to 1.2 weight percent of polycarboxylate water reducer and 2 to 4 weight percent of composite explosion-proof agent.
2. The high-strength explosion-proof castable for the converter mouth of the secondary lead converter as set forth in claim 1, wherein the aluminum titanate contains Al 2 O 3 The content is 56-70 wt% of TiO 2 The content is 30-44 wt% and the purity is more than 96%.
3. The high-strength explosion-proof castable for the mouth of the secondary lead converter as set forth in claim 1, wherein the ZrO in the desilication zirconium is as follows 2 The content is more than or equal to 98 weight percent.
4. The high-strength explosion-proof castable for the converter mouth of the secondary lead converter as set forth in claim 1, wherein Li in the lithium carbonate is as follows 2 CO 3 The content is more than 98.5 percent.
5. The high-strength explosion-proof castable for the converter mouth of the secondary lead converter as set forth in claim 1, wherein said aluminate cement is CA70 cement, al in the aluminate cement 2 O 3 The content is more than or equal to 65 weight percent, and the CaO content is less than or equal to 30 weight percent.
6. The high-strength explosion-proof castable for the converter mouth of the secondary lead converter according to claim 1, wherein the composite explosion-proof agent comprises the following components in percentage by weight: 1-2 wt% of metal aluminum powder and 1-2 wt% of organic explosion-proof fiber, wherein the particle size of the metal aluminum powder is 40-60 mu m, and the purity is more than 99wt%.
7. The high-strength explosion-proof castable for the converter mouth of the secondary lead converter according to claim 1, wherein the water reducer is a polycarboxylate water reducer, the pH value is 5-8, and the solid content is more than or equal to 95%.
8. The method for preparing the high-strength explosion-proof castable for the converter mouth of the secondary lead converter as claimed in claim 1, which is characterized by comprising the following steps:
according to the content of the aggregate and the matrix material, uniformly mixing the matrix material, adding the uniformly mixed matrix material into the aggregate, and uniformly mixing; and then adding 10-15 wt% of water into the mixture, stirring uniformly, vibrating and molding, curing for 12-24 hours at room temperature, and finally preserving heat for 24-36 hours at 80-120 ℃ to obtain the high-strength explosion-proof castable for the secondary lead converter mouth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211071360.1A CN115403362B (en) | 2022-09-02 | 2022-09-02 | High-strength explosion-proof castable for secondary lead converter mouth and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211071360.1A CN115403362B (en) | 2022-09-02 | 2022-09-02 | High-strength explosion-proof castable for secondary lead converter mouth and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115403362A CN115403362A (en) | 2022-11-29 |
| CN115403362B true CN115403362B (en) | 2023-08-22 |
Family
ID=84163903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211071360.1A Active CN115403362B (en) | 2022-09-02 | 2022-09-02 | High-strength explosion-proof castable for secondary lead converter mouth and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115403362B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118359423B (en) * | 2024-06-17 | 2024-08-13 | 河北国亮新材料股份有限公司 | Quick-drying explosion-proof castable and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000327435A (en) * | 1999-05-13 | 2000-11-28 | Asahi Glass Co Ltd | Monolithic refractory and waste melting furnace using the same |
| WO2013183091A1 (en) * | 2012-06-04 | 2013-12-12 | ロザイ工業株式会社 | Unburned brick |
| CN106927838A (en) * | 2017-02-17 | 2017-07-07 | 北京兰海金诚耐火材料有限责任公司 | A kind of wear-resisting anti-explosion refractory castable of Stainless-steel fibre |
| CN109650918A (en) * | 2019-01-31 | 2019-04-19 | 武汉科技大学 | A kind of environment-friendly type castable refractory containing chromium and preparation method thereof |
| CN111004041A (en) * | 2019-12-05 | 2020-04-14 | 上海利尔耐火材料有限公司 | Ladle bottom castable taking aluminum-chromium slag as main material and preparation method thereof |
-
2022
- 2022-09-02 CN CN202211071360.1A patent/CN115403362B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000327435A (en) * | 1999-05-13 | 2000-11-28 | Asahi Glass Co Ltd | Monolithic refractory and waste melting furnace using the same |
| WO2013183091A1 (en) * | 2012-06-04 | 2013-12-12 | ロザイ工業株式会社 | Unburned brick |
| CN106927838A (en) * | 2017-02-17 | 2017-07-07 | 北京兰海金诚耐火材料有限责任公司 | A kind of wear-resisting anti-explosion refractory castable of Stainless-steel fibre |
| CN109650918A (en) * | 2019-01-31 | 2019-04-19 | 武汉科技大学 | A kind of environment-friendly type castable refractory containing chromium and preparation method thereof |
| CN111004041A (en) * | 2019-12-05 | 2020-04-14 | 上海利尔耐火材料有限公司 | Ladle bottom castable taking aluminum-chromium slag as main material and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 王俊涛.ZrO2增韧刚玉-尖晶石浇注料的研究.中国优秀硕士学位论文全文数据库工程科技Ⅰ辑.2009,B015-46. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115403362A (en) | 2022-11-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100297091B1 (en) | Chrome-free brick | |
| CN105777159B (en) | Method for producing large-scale copper smelting furnace lining bricks by smelting chromium slag | |
| CN115403362B (en) | High-strength explosion-proof castable for secondary lead converter mouth and preparation method thereof | |
| CN112521168B (en) | Coal-fired multi-composite spinel material and preparation method and application thereof | |
| CN102898168B (en) | Compound magnesium-aluminum-chrome refractory castable for copper smelting tundish | |
| CN107311675B (en) | A kind of air brick and preparation method thereof by the preparation of industry byproduct aluminium chromium slag | |
| CN112079608A (en) | Self-flowing heat-resistant concrete using waste electric porcelain | |
| CN111646812B (en) | Silicon carbide-calcium hexaluminate-aluminum composite refractory material | |
| CN115141005A (en) | Containing Mg 2+ Enhanced MgO-SiO 2 -H 2 O-series combined unshaped refractory castable and preparation method thereof | |
| CN103011857B (en) | Magnesium-enriched spinel zirconium brick for nonferrous metallurgy kiln | |
| CN100463879C (en) | Composite refractory materials of periclase-spinel-lantanum (calcium) zirconate | |
| CN114315322A (en) | Furnace lining material for high-titanium iron smelting | |
| GB2160195A (en) | Refractory fused chromic oxide-alumina bricks and compositions made from a granular fused material and processes for their production | |
| CN109020574A (en) | A kind of environment-friendly type magnesite-olivine castable refractory | |
| CN114573324A (en) | RH vacuum furnace lining refractory material and preparation method thereof | |
| CN113173780B (en) | Magnesia-bonded refractory castable containing in-situ spinel and preparation method thereof | |
| CN112313188A (en) | Chromium oxide brick | |
| CN114180953A (en) | Method for synthesizing magnesia-alumina spinel from waste magnesium and aluminum-carbon bricks and magnesia-alumina spinel | |
| CN112279655A (en) | Binding agent, magnesium ramming mass and preparation method thereof | |
| JP7549247B2 (en) | Raw material mixture for magnesia-chrome refractory bricks and manufacturing method for magnesia-chrome refractory bricks | |
| CN110981448A (en) | Preparation method of chromite roasting rotary kiln burning zone castable | |
| CN113816727B (en) | Castable for medium-frequency induction furnace and preparation method thereof | |
| JPH0692724A (en) | Production of spinel-alumina fired brick | |
| WO2024190742A1 (en) | Method for manufacturing unfired basic brick | |
| JP3157310B2 (en) | Refractory |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |