CN117326876A - Composite refractory clay for secondary lead smelting furnace masonry and preparation method thereof - Google Patents
Composite refractory clay for secondary lead smelting furnace masonry and preparation method thereof Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 37
- 238000003723 Smelting Methods 0.000 title claims abstract description 29
- 239000004927 clay Substances 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title description 5
- 239000000843 powder Substances 0.000 claims abstract description 98
- 229910052863 mullite Inorganic materials 0.000 claims abstract description 43
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims abstract description 36
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 24
- 229910004298 SiO 2 Inorganic materials 0.000 claims abstract description 22
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 22
- 239000010431 corundum Substances 0.000 claims abstract description 22
- 239000002994 raw material Substances 0.000 claims abstract description 22
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910000423 chromium oxide Inorganic materials 0.000 claims abstract description 18
- 239000002270 dispersing agent Substances 0.000 claims abstract description 13
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 12
- 239000011230 binding agent Substances 0.000 claims abstract description 9
- 239000011651 chromium Substances 0.000 claims abstract description 6
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 5
- 238000004806 packaging method and process Methods 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 8
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 6
- 229920005551 calcium lignosulfonate Polymers 0.000 claims description 6
- RYAGRZNBULDMBW-UHFFFAOYSA-L calcium;3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical group [Ca+2].COC1=CC=CC(CC(CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O RYAGRZNBULDMBW-UHFFFAOYSA-L 0.000 claims description 6
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 6
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 6
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 6
- 230000035622 drinking Effects 0.000 claims description 6
- 239000008399 tap water Substances 0.000 claims description 6
- 235000020679 tap water Nutrition 0.000 claims description 6
- 238000011049 filling Methods 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- 238000007580 dry-mixing Methods 0.000 claims description 2
- 238000000227 grinding Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 230000035939 shock Effects 0.000 abstract description 12
- 239000011449 brick Substances 0.000 abstract description 11
- -1 aluminum-chromium-zirconium Chemical compound 0.000 abstract description 4
- 230000003628 erosive effect Effects 0.000 abstract description 4
- 239000011819 refractory material Substances 0.000 abstract description 3
- 239000012535 impurity Substances 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 10
- 239000000395 magnesium oxide Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 4
- 239000007767 bonding agent Substances 0.000 description 4
- 235000011837 pasties Nutrition 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 238000004901 spalling Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- NACUKFIFISCLOQ-UHFFFAOYSA-N [Mg].[Cr] Chemical compound [Mg].[Cr] NACUKFIFISCLOQ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011499 joint compound Substances 0.000 description 1
- JQJCSZOEVBFDKO-UHFFFAOYSA-N lead zinc Chemical compound [Zn].[Pb] JQJCSZOEVBFDKO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
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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
- C04B35/01—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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B13/00—Obtaining lead
- C22B13/02—Obtaining lead by dry processes
-
- 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
-
- 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
- C04B2235/3241—Chromium oxides, chromates, 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
- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3244—Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/327—Iron group oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3272—Iron oxides or oxide forming salts thereof, e.g. hematite, magnetite
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—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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- 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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- 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
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- 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
Abstract
The invention belongs to the technical field of refractory materials, and discloses composite refractory clay for secondary lead smelting furnace masonry, which is mainly prepared from the following raw materials in percentage by mass: 70-74% of white corundum powder, 8-12% of chromium oxide green powder and a-Al 2 O 3 3-6% of micro powder, 3-5% of fused zirconia powder, 5-8% of high-purity mullite powder, and adding a binding agent and a dispersing agent which respectively account for 2% of the total weight; al in the composite refractory mortar 2 O 3 ≥78%、Cr 2 O 3 ≥8.0%、ZrO 2 +HfO 2 ≥2.8%、SiO 2 Less than or equal to 5 percent. The aluminum-chromium-zirconium mullite composite refractory mortar product has excellent thermal shock stability and erosion resistance due to high purity of raw materials and low impurity content, and is matched with refractory bricks made of the same materials for use, so that the service life of a masonry body is effectively prolonged.
Description
Technical Field
The invention belongs to the technical field of refractory materials, and relates to composite refractory clay for secondary lead smelting furnace masonry and a preparation method thereof.
Background
The fire clay is also called fire clay or joint compound and is used as a joint material of refractory product masonry. Almost all refractory raw materials can be made into powders for the formulation of refractory mortar. The materials can be classified into clay, high alumina, siliceous and magnesia, magnesia-chromite refractory clay and the like. The particle size of the refractory mortar varies depending on the application requirements, and its ultimate particle size is generally less than 1mm, and sometimes less than 0.5mm or finer.
The refractory bricks for the masonry of the wall and the furnace top of the secondary lead smelting furnace are usually magnesia chrome bricks or magnesia alumina chrome bricks, and the conventional magnesia chrome refractory clay is adopted as the masonry refractory clay, but the conventional magnesia chrome refractory clay has loose structure at high temperature, has general thermal shock resistance and erosion resistance, and the secondary lead serving as heavy metal has extremely large specific gravity, so that the metal solution is extremely easy to infiltrate, erode and peel at the joint part of the refractory clay of the bricks in the smelting process. Particularly, the lead slag is necessarily permeated through gaps among bricks at the position below the slag line, so that the structure is gradually loosened until loosening and falling off are caused.
In recent years, the secondary lead smelting furnace starts to adopt aluminum-chromium-zirconium bricks or aluminum-chromium-zirconium mullite bricks to gradually replace magnesium-chromium bricks and magnesium-aluminum-chromium bricks, so that good use effects are obtained, and particularly, the mullite is used for producing high-temperature refractory materials, so that the thermal shock resistance is greatly improved. However, when the corundum and mullite raw materials are directly used in the composite grading, the corundum and mullite are both in a high-temperature phase, so that the corundum and mullite are not easy to sinter, and the corundum and mullite have low bonding strength and poor wear resistance at medium and low temperatures. Therefore, the components and the proportion of the refractory clay need to be optimized, and the thermal shock stability and the erosion resistance of the refractory clay are comprehensively improved.
Disclosure of Invention
The invention aims to provide composite refractory clay for secondary lead smelting furnace masonry and a preparation method thereof, and the composite refractory clay has the advantages of stable high-temperature physical and chemical properties, excellent thermal shock stability and erosion resistance, small change rate of a re-firing line, small thermal expansion rate, compact structure at high temperature, firm combination, difficult spalling, convenient manufacture, easy construction and the like.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention provides composite refractory clay for secondary lead smelting furnace masonry, which is mainly prepared from the following raw materials in percentage by mass: 70-74% of white corundum powder with granularity less than or equal to 0.074mm, 8-12% of chromium oxide green powder with granularity less than or equal to 0.045mm and a-Al with granularity less than or equal to 0.005mm 2 O 3 3 to 6 percent of micro powder, 3 to 5 percent of electric smelting zirconia powder with the granularity less than or equal to 0.045mm, 5 to 8 percent of high-purity mullite powder with the granularity less than or equal to 0.074mm, and binding agent and dispersing agent which respectively account for 2 percent of the total weight are added; al in the composite refractory mortar 2 O 3 ≥78％、Cr 2 O 3 ≥8.0％、ZrO 2 +HfO 2 ≥2.8％、SiO 2 ≤5％。
Preferably, al in the white corundum powder 2 O 3 More than or equal to 99 percent, cr in the chromium oxide green powder 2 O 3 ≥99％，α-Al 2 O 3 Al in the micropowder 2 O 3 More than or equal to 99 percent, al in the high-purity mullite powder 2 O 3 ≥70％、SiO 2 Less than or equal to 30 percent, zrO in the fused zirconia powder 2 +HfO 2 ≥98％、SiO 2 ≤0.6％。
Preferably, the binding agent is calcium lignosulfonate and the dispersing agent is carboxymethyl cellulose.
Preferably, the composite refractory mortar is mainly prepared from the following raw materials in percentage by mass: white corundum powder 72% with granularity less than or equal to 0.074mm, chromium oxide green powder 9% with granularity less than or equal to 0.045mm and a-Al with granularity less than or equal to 0.005mm 2 O 3 3% of micro powder, 4% of electric smelting zirconia powder with granularity less than or equal to 0.045mm and 8% of high-purity mullite powder with granularity less than or equal to 0.074mmAdding a binding agent and a dispersing agent which respectively account for 2 percent of the total weight; al in the composite refractory mortar 2 O 3 79.79％、Cr 2 O 3 8.90％、ZrO 2 +HfO 2 3.91％、SiO 2 2.43％、CaO≤1％、Fe 2 O 3 ≤0.8％。
The invention also provides a preparation method of the composite refractory clay for the secondary lead smelting furnace masonry, which comprises the following steps:
a. the raw materials and the granularity are weighed according to the raw materials and the granularity requirement;
b. the main material dry powder is prepared by white corundum powder, chromium oxide green powder and alpha-Al 2 O 3 Sequentially adding the micro powder, the high-purity mullite powder and the fused zirconia powder into a mixing mill for mixing and grinding for 20-30 min, weighing, and filling into a 50kg packaging bag or a 25kg packaging bag;
c. weighing the binding agent and the dispersing agent, mixing, packaging with small bags of auxiliary materials, filling into the packaging bags, and packaging;
d. when in use, dry-mixing is carried out for 5-10 min according to the main material dry powder-auxiliary material small bag, then drinking tap water accounting for 30-40% of the total powder amount is added for wet-mixing or stirring for 20-30 min to obtain thick paste.
Compared with the prior art, the invention has the beneficial effects that:
the alumina corundum powder, the fused zirconia powder, the chromium oxide green powder and the mullite powder in the aluminum-chromium-zirconium-mullite composite refractory mortar are all high-purity grade and superfine micropowder, and the composite mineral phase refractoriness and the load softening temperature of the composite mineral phase are high due to high purity of raw materials and low impurity content, and the added superfine micropowder forms a compact and uniform structure at high temperature, so that the composite mineral phase refractory mortar has good high-temperature mechanical property; the added high-purity mullite powder remarkably improves the thermal shock resistance and the spalling resistance, can be widely applied to severe parts requiring spalling resistance, permeation resistance and the like of thermal kilns such as a reclaimed lead smelting triple furnace, a lead-zinc smelting converter and the like, is matched with refractory bricks made of the same materials for use, and can effectively prolong the service life of a masonry body.
Detailed Description
The following examples are illustrative of the present invention and are not intended to limit the scope of the invention. The technical means used in the examples are conventional means well known to those skilled in the art unless otherwise indicated. The test methods in the following examples are conventional methods unless otherwise specified. The raw materials used in the following examples are all commercially available.
Example 1
The composite refractory clay for secondary lead smelting furnace masonry adopts 70kg of white corundum powder with the granularity less than or equal to 0.074mm, 12kg of chromium oxide green powder with the granularity less than or equal to 0.045mm and a-Al with the granularity less than or equal to 0.005mm 2 O 3 6kg of micro powder, 3kg of electric smelting zirconia powder with the granularity less than or equal to 0.045mm, 5kg of high-purity mullite powder with the granularity less than or equal to 0.074mm, 2kg of bonding agent calcium lignosulfonate and 2kg of dispersing agent carboxymethyl cellulose. Al in the white corundum powder used in this example 2 O 3 More than or equal to 99 percent, cr in the chromium oxide green powder 2 O 3 ≥99％，α-Al 2 O 3 Al in the micropowder 2 O 3 More than or equal to 99 percent, al in the high-purity mullite powder 2 O 3 ≥70％、SiO 2 Less than or equal to 30 percent, zrO in the fused zirconia powder 2 +HfO 2 ≥98％、SiO 2 ≤0.6％。
The raw materials are mixed and stirred for 20 to 30 minutes by 40 percent of drinking tap water to form thick pasty slurry, and the aluminum-chromium-zirconium-mullite composite refractory mortar product is obtained, and the main chemical components and the performance indexes are shown in the table 1.
Example 2
In the embodiment, the composite refractory clay for secondary lead smelting furnace masonry adopts 72kg of white corundum powder with the granularity less than or equal to 0.074mm, 10kg of chromium oxide green powder with the granularity less than or equal to 0.045mm and a-Al with the granularity less than or equal to 0.005mm 2 O 3 4kg of micro powder, 4kg of electric smelting zirconia powder with the granularity less than or equal to 0.045mm, 6kg of high-purity mullite powder with the granularity less than or equal to 0.074mm, 2kg of bonding agent calcium lignosulfonate and 2kg of dispersing agent carboxymethyl cellulose. Al in the white corundum powder used in this example 2 O 3 More than or equal to 99 percent, cr in the chromium oxide green powder 2 O 3 ≥99％，α-Al 2 O 3 Al in the micropowder 2 O 3 More than or equal to 99 percent, al in the high-purity mullite powder 2 O 3 ≥70％、SiO 2 Less than or equal to 30 percent, zrO in the fused zirconia powder 2 +HfO 2 ≥98％、SiO 2 ≤0.6％。
The raw materials are mixed and stirred for 20 to 30 minutes by 40 percent of drinking tap water to form thick pasty slurry, and the aluminum-chromium-zirconium-mullite composite refractory mortar product is obtained, and the main chemical components and the performance indexes are shown in the table 1.
Example 3
The composite refractory clay for secondary lead smelting furnace masonry adopts 73kg of white corundum powder with the granularity less than or equal to 0.074mm, 8kg of chromium oxide green powder with the granularity less than or equal to 0.045mm and a-Al with the granularity less than or equal to 0.005mm 2 O 3 4kg of micro powder, 4kg of electric smelting zirconia powder with the granularity less than or equal to 0.045mm, 7kg of high-purity mullite powder with the granularity less than or equal to 0.074mm, 2kg of bonding agent calcium lignosulfonate and 2kg of dispersing agent carboxymethyl cellulose. Al in the white corundum powder used in this example 2 O 3 More than or equal to 99 percent, cr in the chromium oxide green powder 2 O 3 ≥99％，α-Al 2 O 3 Al in the micropowder 2 O 3 More than or equal to 99 percent, al in the high-purity mullite powder 2 O 3 ≥70％、SiO 2 Less than or equal to 30 percent, zrO in the fused zirconia powder 2 +HfO 2 ≥98％、SiO 2 ≤0.6％。
The raw materials are mixed and stirred for 20 to 30 minutes by 40 percent of drinking tap water to form thick pasty slurry, and the aluminum-chromium-zirconium-mullite composite refractory mortar product is obtained, and the main chemical components and the performance indexes are shown in the table 1.
Example 4
In the embodiment, the composite refractory clay for secondary lead smelting furnace masonry adopts 72kg of white corundum powder with the granularity less than or equal to 0.074mm, 9kg of chromium oxide green powder with the granularity less than or equal to 0.045mm and a-Al with the granularity less than or equal to 0.005mm 2 O 3 3kg of micro powder, 4kg of electric smelting zirconia powder with the granularity less than or equal to 0.045mm, 8kg of high-purity mullite powder with the granularity less than or equal to 0.074mm, 2kg of bonding agent calcium lignosulfonate and 2kg of dispersing agent carboxymethyl cellulose. Al in the white corundum powder used in this example 2 O 3 More than or equal to 99 percent, cr in the chromium oxide green powder 2 O 3 ≥99％，α-Al 2 O 3 Al in the micropowder 2 O 3 More than or equal to 99 percent, al in the high-purity mullite powder 2 O 3 ≥70％、SiO 2 Less than or equal to 30 percent, zrO in the fused zirconia powder 2 +HfO 2 ≥98％、SiO 2 ≤0.6％。
The raw materials are mixed and stirred for 20 to 30 minutes by 40 percent of drinking tap water to form thick pasty slurry, and the aluminum-chromium-zirconium-mullite composite refractory mortar product is obtained, and the main chemical components and the performance indexes are shown in the table 1.
Comparative example 1
The raw material components and the amounts used in this example are the same as those in example 4, except that: al in high-purity mullite powder 2 O 3 ≥65％、SiO 2 Less than or equal to 35 percent. The performance index is shown in Table 2.
Comparative example 2
The raw material components and the amounts used in this example are the same as those in example 4, except that: al in high-purity mullite powder 2 O 3 ≥68％、SiO 2 Less than or equal to 32 percent. The performance index is shown in Table 2.
Comparative example 3
The raw material components and the amounts used in this example are the same as those in example 4, except that: al in high-purity mullite powder 2 O 3 ≥72％、SiO 2 Less than or equal to 28 percent. The performance index is shown in Table 2.
Comparative example 4
The raw material components and the amounts used in this example are the same as those in example 4, except that: al in high-purity mullite powder 2 O 3 ≥75％、SiO 2 Less than or equal to 25 percent. The performance index is shown in Table 2.
Table 1 examples 1 to 4 performance indices of alumina-chromium-zirconia-mullite composite refractory mortar products
| Performance index | Example 1 | Example 2 | Example 3 | Example 4 |
| Al 2 O 3 (％) | 78.62 | 79.42 | 81.12 | 79.79 |
| Cr 2 O 3 (％) | 11.78 | 9.86 | 8.01 | 8.90 |
| ZrO 2 +HfO 2 (％) | 2.91 | 3.91 | 3.92 | 3.91 |
| SiO 2 (％) | 1.74 | 1.84 | 2.09 | 2.43 |
| Bond flexural strength (MPa) after drying at 110 ℃ for 24h | 5.8 | 6.3 | 4.2 | 6.2 |
| Adhesive flexural strength (MPa) after burning at 1500 ℃ for 3h | 10.6 | 12.5 | 10.6 | 11.8 |
| Thermal shock stability/1100 ℃ water cooling circulation (secondary) | 6 | 8 | 9 | 12 |
Table 2 comparative examples 1 to 4 performance indexes of aluminum-chromium-zirconium-mullite composite refractory mortar products
| Performance index | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 |
| Bond flexural strength (MPa) after drying at 110 ℃ for 24h | 4.2 | 4.8 | 6.7 | 6.8 |
| Adhesive flexural strength (MPa) after burning at 1500 ℃ for 3h | 10.3 | 10.7 | 12.3 | 12.5 |
| Thermal shock stability/1100 ℃ water cooling circulation (secondary) | 5 | 7 | 12 | 13 |
As can be seen from table 1, the addition amount of the high-purity mullite powder in examples 1 to 4 is gradually increased, and the thermal shock resistance of the aluminum-chromium-zirconium-mullite composite refractory mortar product is also gradually increased, which indicates that the addition of the high-purity mullite powder is helpful for improving the thermal shock resistance of the refractory mortar product; as can be seen from Table 2, the high purity mullite powder of comparative examples 1 to 4 contains Al 2 O 3 When the content is lower than 70%, the thermal shock resistance is greatly reduced, and Al in the high-purity mullite powder 2 O 3 When the content is higher than 70%, the thermal shock resistance is not obviously improved. Therefore, by combining tables 1 and 2, the purity of the selected high purity mullite powder is not lower than 70% based on the cost performance of the refractory clay.
The above-mentioned embodiments are merely preferred embodiments of the present invention, which are not intended to limit the scope of the present invention, and other embodiments can be easily made by those skilled in the art through substitution or modification according to the technical disclosure in the present specification, so that all changes and modifications made in the principle of the present invention shall be included in the scope of the present invention.
Claims (5)
1. The composite refractory clay for secondary lead smelting furnace masonry is characterized by being prepared from the following raw materials in percentage by mass: 70-74% of white corundum powder with granularity less than or equal to 0.074mm, 8-12% of chromium oxide green powder with granularity less than or equal to 0.045mm and a-Al with granularity less than or equal to 0.005mm 2 O 3 3-6% of micro powder, 3-5% of electric smelting zirconia powder with the granularity less than or equal to 0.045mm and 5-8% of high-purity mullite powder with the granularity less than or equal to 0.074mm, and adding a binding agent and a dispersing agent which respectively account for 2% of the total weight; al in the composite refractory mortar 2 O 3 ≥78%、Cr 2 O 3 ≥8.0%、ZrO 2 +HfO 2 ≥2.8%、SiO 2 ≤5%。
2. The composite refractory mortar for a secondary lead smelting furnace according to claim 1, wherein the white corundum powder contains Al 2 O 3 More than or equal to 99 percent, cr in the chromium oxide green powder 2 O 3 ≥99%，α-Al 2 O 3 Al in the micropowder 2 O 3 More than or equal to 99 percent, al in the high-purity mullite powder 2 O 3 ≥70%、SiO 2 Less than or equal to 30 percent, zrO in the fused zirconia powder 2 +HfO 2 ≥98%、SiO 2 ≤0.6%。
3. The composite refractory mortar for masonry of a secondary lead smelting furnace according to claim 1, wherein the binding agent is calcium lignosulfonate and the dispersing agent is carboxymethyl cellulose.
4. The composite refractory mortar for secondary lead smelting furnace masonry according to claim 1, wherein the composite refractory mortar is mainly prepared from the following raw materials in percentage by mass: white corundum powder 72% with granularity less than or equal to 0.074mm, chromium oxide green powder 9% with granularity less than or equal to 0.045mm and a-Al with granularity less than or equal to 0.005mm 2 O 3 3% of micro powder, 4% of electric smelting zirconia powder with the granularity less than or equal to 0.045mm and 8% of high-purity mullite powder with the granularity less than or equal to 0.074mm, and adding a binding agent and a dispersing agent which respectively account for 2% of the total weight; al in the composite refractory mortar 2 O 3 79.79%、Cr 2 O 3 8.90%、ZrO 2 +HfO 2 3.91%、SiO 2 2.43%。
5. The method for preparing the composite refractory mortar for secondary lead smelting furnace masonry according to any one of claims 1-4, which is characterized by comprising the following steps:
a. the raw materials and the granularity are weighed according to the raw materials and the granularity requirement;
b. the main material dry powder is prepared by white corundum powder, chromium oxide green powder and alpha-Al 2 O 3 Sequentially adding the micro powder, the high-purity mullite powder and the fused zirconia powder into a mixing mill for mixing and grinding for 20-30 min, weighing, and filling into a 50kg packaging bag or a 25kg packaging bag;
c. weighing the binding agent and the dispersing agent, mixing, packaging with small bags of auxiliary materials, filling into the packaging bags, and packaging;
d. when in use, dry-mixing is carried out for 5-10 min according to the main material dry powder-auxiliary material small bag, then drinking tap water accounting for 30-40% of the total powder amount is added for wet-mixing or stirring for 20-30 min to obtain thick paste.
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