CN111253166A - Al containing reclaimed material2O3-SiC-C brick and preparation method thereof - Google Patents

Al containing reclaimed material2O3-SiC-C brick and preparation method thereof Download PDF

Info

Publication number
CN111253166A
CN111253166A CN202010227598.3A CN202010227598A CN111253166A CN 111253166 A CN111253166 A CN 111253166A CN 202010227598 A CN202010227598 A CN 202010227598A CN 111253166 A CN111253166 A CN 111253166A
Authority
CN
China
Prior art keywords
parts
brick
sic
equal
corundum
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.)
Pending
Application number
CN202010227598.3A
Other languages
Chinese (zh)
Inventor
姜爱君
张兴华
尚学军
黄锋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Jiaht Materials Co Ltd
Original Assignee
Jiangsu Jiaht Materials Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Jiangsu Jiaht Materials Co Ltd filed Critical Jiangsu Jiaht Materials Co Ltd
Priority to CN202010227598.3A priority Critical patent/CN111253166A/en
Publication of CN111253166A publication Critical patent/CN111253166A/en
Pending legal-status Critical Current

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
    • C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/62204—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products using waste materials or refuse
    • 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
    • C04B2235/38—Non-oxide ceramic constituents or additives
    • C04B2235/3817—Carbides
    • C04B2235/3826—Silicon carbides
    • 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
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
    • C04B2235/422—Carbon
    • C04B2235/425—Graphite
    • 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
    • C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
    • C04B2235/428—Silicon
    • 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
    • C04B2235/9676—Resistance against chemicals, e.g. against molten glass or molten salts against molten metals such as steel or aluminium

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

The invention discloses Al containing reclaimed materials2O3the-SiC-C brick relates to the field of refractory materials and comprises the following components in parts by weight: 20-30 parts of reclaimed material particles; 30-40 parts of high-alumina bauxite particles; 10-20 parts of corundum particles; 10-20 parts of corundum fine powder; 5-15 parts of silicon carbide fine powder; 5-15 parts of flake graphite; 0-5 parts of an additive; 2-6 parts of a binding agent. The high-temperature hot-blast resistant hot metal ladle has the advantages of good slag erosion resistance and molten iron erosion resistance, high-temperature breaking strength, excellent thermal shock resistance, stable high-temperature thermal expansion rate and stable residual expansion rate, and can be used as a working lining of the hot metal ladle to prolong the service life of the hot metal ladle.

Description

Al containing reclaimed material2O3-SiC-C brick and preparation method thereof
Technical Field
The invention relates to the technical field of refractory materials, in particular to Al containing reclaimed materials2O3-SiC-C brick and a preparation method thereof.
Background
In the production link from a blast furnace to a steelmaking furnace, most of the containers for containing molten iron of iron and steel enterprises adopt a form of one tank to the bottom. The blast furnace molten iron is added into a ladle and then transported to a steel plant, and is pretreated by the molten iron, and the molten iron is added into a steel furnace after the molten iron composition meets the requirement. In the whole process, the transportation of the molten iron and the pretreatment of the molten iron are carried out in the ladle without replacing a high-temperature container.
The molten iron is conveyed to a steelmaking furnace through a ladle under certain protection conditions, and the distance can reach more than 30 km. The pretreatment of molten iron is to carry out desiliconization, dephosphorization and desulfurization (referred to as 'triple elimination') treatment in a ladle, is a necessary process for smelting high-quality steel and clean steel, and is also finished in the ladle. After the ladle is charged with blast furnace molten iron, slag such as blast furnace slag and products of molten iron pretreatment in the tapping runner is also charged into the ladle, and the slag is acidic, which can cause corrosion to refractory materials of the ladle. During molten iron conveying and pretreatment, the scouring of slag and molten iron, the vibration of the ladle and the like are all influencing factors for forming erosion and scouring on refractory materials of the ladle. Thus, the working environment of the ladle lining material is: when receiving iron, the lining refractory material can bear the ladle bottom scouring and the rapid cooling and rapid heating of the high-temperature and high-speed molten iron; during transportation and standing waiting, the lining refractory bears the high temperature of molten iron, the erosion of slag and mechanical vibration; during pretreatment, the lining refractory bears the scouring of the rotating molten iron and the erosion of the pretreated slag; during tapping, the lining refractory bears the high temperature of molten iron, the scouring of the molten iron and the rapid cooling and heating.
Al2O3the-SiC-C brick is used as a main lining material of the current ladle working lining, and has excellent normal-temperature and high-temperature mechanical properties, thermal shock stability, scouring resistance and slag erosion resistance. Existing Al2O3Al used for-SiC-C bricks2O3The high-alumina bauxite clinker or corundum is usually prepared by using phenolic resin as a bonding agent, and performing batching, mixing, molding and baking, and the high-alumina bauxite clinker or corundum can be constructed and used after being detected to be qualified. Compared with the traditional clay brick and high-alumina brick, the Al brick is made of Al2O3the-SiC-C bricks have excellent performances and greatly improve the comprehensive furnace life of the foundry ladle. When the molten iron pretreatment process is available, the furnace life can reach 500 times, and no molten iron pretreatment process is availableIn the molten iron pretreatment process, the furnace life can reach 1000 heats. The furnace life of the foundry ladle is stably improved, and the turnover efficiency of the foundry ladle is improved, so that Al2O3the-SiC-C brick is favored by iron and steel enterprises.
Albeit Al2O3the-SiC-C brick has excellent performance and the using effect is also accepted by customers, but still has a very troublesome problem: with the advancement of the age of the ladle, Al2O3And SiO2The reaction takes place to form mullite (A)3S2) The ore phase in the material is changed from corundum phase to mullite phase, and Al in the later period of furnace life2O3-SiC-C brick and Al in early furnace life2O3Compared with the SiC-C brick, the thermal expansion of the material is reduced along with the transformation of the mineral phase of the material, the masonry joint is not sufficiently compensated under the thermal state, so that molten iron and slag preferentially erode and scour the brick joint, and finally, the brick joint at the later stage of the furnace age of the molten iron ladle is more and more obvious, thereby forming a steamed bread shape. When the ladle is used, the iron receiving frequency is usually 3-5 furnaces/day, the slag bonding and the cover bonding of the ladle opening need to be carried out off-line treatment, and the damaged refractory material needs to be maintained after the slag removing treatment, so the online service cycle of the ladle is longer. Typically, there is a pretreated ladle with a life cycle of up to 6 months, and no pretreated ladle with a life cycle of up to 12 months. The refractory material of the working lining of the ladle is usually built on site, a large number of building seams are brought in the construction process, under the influence of long-term cold and hot alternate use conditions, the brick seams are difficult to heal and are eroded by slag and scoured by molten iron, the material consumption speed of the brick seam area is obviously higher than that of other areas, and therefore the 'steamed bread shape' is displayed. At the end of the furnace life, the residual bricks of the ladle wall working lining are shortened, the structural strength of the masonry is reduced, when the high-temperature thermal expansion rate and the residual expansion rate of the material are not proper, the erosion rate of brick joints is accelerated, and the 'steamed bread shape' is more prominent. This phenomenon is likely to occur at the end stage of the age of the ladle, and may cause molten iron to permeate into the permanent layer, which has a great potential safety hazard.
To improve Al2O3The high-temperature thermal expansion rate and the residual expansion rate of the-SiC-C brick are obtained by adding MgO in the prior art, but goodAnd (5) effect. MgO and Al at high temperature2O3The reaction to form spinel occurs with a volume effect of 6-9%, but due to the presence of elemental silicon powder, silicon carbide and SiO produced by oxidation of silicon2The low-melting-point phase generated by complex multi-element reaction causes the material to shrink obviously, weakens the expansion effect caused by spinel generation, loosens the structure of the material, and reduces the oxidation resistance and other performances of the material. Meanwhile, the thermal expansion rate of the sample is reduced along with the increase of the addition amount of the magnesia, and the expansion amount is reduced more obviously after the temperature is higher than 1000 ℃. Therefore, with the higher and higher smelting proportion of high-quality steel and special steel, the production process of molten iron pretreatment is widely adopted, and how to further improve the furnace life of the ladle becomes the key point for improving the turnover efficiency and creating benefits of iron and steel enterprises.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides an Al containing reclaimed materials2O3the-SiC-C brick comprises the following components in parts by weight:
20-30 parts of reclaimed material particles;
30-40 parts of high-alumina bauxite particles;
10-20 parts of corundum particles;
10-20 parts of corundum fine powder;
5-15 parts of silicon carbide fine powder;
5-15 parts of flake graphite;
0-5 parts of an additive;
2-6 parts of a binding agent.
The technical effects are as follows: the invention aims at the existing Al2O3The service characteristics of the-SiC-C brick are further improved, and a recycled material-containing Al is designed2O3the-SiC-C brick has good slag erosion resistance and molten iron erosion resistance, high-temperature breaking strength, excellent thermal shock resistance, stable high-temperature thermal expansion rate and residual expansion rate, and can be used as a working lining of a foundry ladle to improve the service life of the foundry ladle.
The technical scheme of the invention is further defined as follows:
al containing recycled material2O3the-SiC-C brick comprises the following chemical components in percentage by mass: al (Al)2O3≥80.0%，SiC≤3.0%，C≤3.0%，SiO2≤10.0%，K2O+Na2O≤0.5%。
Al containing recycled material2O3And (4) selecting an original brick layer material from a lining material obtained during the overhaul of a pretreated foundry ladle or a torpedo tank, and obtaining a qualified raw material by sorting, coarse crushing, impurity removal, light burning, granulation and classification.
Al containing recycled material2O3the-SiC-C brick comprises the following chemical components in percentage by mass: al (Al)2O3≥85.0%，SiO2≤10.0%，K2O+Na2O≤0.5%。
Al containing recycled material2O3The brick comprises-SiC-C brick, and corundum particles comprise the following chemical components in percentage by mass: al (Al)2O3≥94.0%，TiO2≤3.0%。
Al containing recycled material2O3The corundum fine powder comprises the following chemical components in percentage by mass and particle size: al (Al)2O3≥94.0%，TiO2Less than or equal to 3.0 percent and the granularity less than or equal to 200 meshes.
Al containing recycled material2O3The SiC-C brick comprises the following chemical components in percentage by mass and particle size: SiC is more than or equal to 90.0 percent, and the granularity is less than or equal to 200 meshes.
Al containing recycled material2O3The brick comprises-SiC-C brick, crystalline flake graphite comprises the following chemical components in percentage by mass: c is more than or equal to 95.0 percent, and the granularity is less than or equal to 100 meshes.
Al containing recycled material2O3The additive comprises aluminum powder and silicon powder, and the aluminum powder comprises the following chemical components in percentage by mass and particle size: al is more than or equal to 98.0 percent, and the granularity is less than or equal to 200 meshes; chemistry of silica fumeThe components and the mass percentage and the particle size fraction are as follows: si is more than or equal to 97.0 percent, and the granularity is less than or equal to 200 meshes; the binding agent is liquid thermosetting phenolic resin.
Another object of the present invention is to provide Al containing a reclaimed material2O3The preparation method of the-SiC-C brick comprises the steps of preparing pug, forming by mechanical pressing and drying and baking, and specifically comprises the following steps:
firstly, adding the reclaimed materials, the bauxite and the corundum as the particle raw materials, and mixing for 3-5min at the speed of 30-50 r/min; then adding 2/3 total amount of binder, and mixing at 30-50r/min for 3-5 min; adding crystalline flake graphite, and mixing at 30-50r/min for 3-5 min; then adding fine powder raw materials of corundum, silicon carbide and additives, and mixing for 3-5min at the speed of 30-50 r/min; finally, adding the remaining 1/3 binding agent, and mixing at the speed of 100-500r/min for 30-50 min; forming the qualified pug on an electric screw press, and pressing to form a green body; drying the green blank at 210 ℃ for 8h to obtain Al containing the reclaimed material2O3-SiC-C brick products.
The invention has the beneficial effects that:
(1) the invention provides Al containing reclaimed materials2O3-SiC-C brick, part of Al2O3By introducing the reclaimed materials, the mullite phase is added in the materials, so that the high-temperature thermal expansion coefficient of the materials can be reduced, and the use effect of the later-period service life of the foundry ladle is improved; the residual expansion rate of the material can be improved, and the possibility of iron infiltration of the permanent layer of the foundry ladle is reduced, so that the lining material of the foundry ladle with excellent performance and good use effect is prepared;
(2) al containing reclaimed material in the invention2O3-SiC-C brick, Al2O3The material not only has corundum phase but also has mullite phase, and because the mullite phase is introduced into the material, the difference between the high-temperature thermal expansion of the material in the early stage and the later stage of the furnace life is small, the brick joints can not change in the high-temperature use process, namely, the brick joints of the latter material can not develop into erosion channels and can not become weak links, so that the Al containing the reclaimed material2O3When the-SiC-C bricks are used as lining materials, the use effect of the later period of the furnace life of the foundry ladle can be improved;
(3) al containing reclaimed material in the invention2O3Because a part of mullite phase is introduced in advance, the material is easy to react at high temperature to generate mullite, the mullite crystal phase is rapidly developed and grown, the residual expansion rate of the material is higher, and when the ladle is cooled from high temperature to low temperature, the brick joint of the later material in a cold state is smaller, so when the ladle is used for cold-cladding iron, Al containing the reclaimed material2O3When the-SiC-C bricks are used as lining materials, the possibility of iron infiltration of permanent layers of the foundry ladle can be reduced.
Detailed Description
Example 1
The Al containing the reclaimed material provided by the embodiment2O3the-SiC-C brick comprises the following components in parts by weight:
20 parts of reclaimed material particles;
30 parts of high bauxite particles;
15 parts of corundum particles;
15 parts of corundum fine powder;
8 parts of silicon carbide fine powder;
10 parts of flake graphite;
2 parts of an additive;
4 parts of a binding agent.
The reclaimed material particles are derived from lining materials during the overhaul of a pretreated foundry ladle or a torpedo ladle, the overhaul lining materials are divided into a reaction layer, a metamorphic layer and an original brick layer, and the chemical components of the original brick layer are not changed greatly before and after the original brick layer is used, so that the original brick layer material is selected. Comprises the following chemical components in percentage by mass: al (Al)2O3≥80.0%，SiC≤3.0%，C≤3.0%，SiO2≤10.0%，K2O+Na2O is less than or equal to 0.5 percent, and qualified raw materials are obtained through sorting, coarse crushing, impurity removal, light burning, granulation and classification. The high bauxite particle comprises the following chemical components in percentage by mass: al (Al)2O3≥85.0%，SiO2≤10.0%，K2O+Na2O is less than or equal to 0.5 percent. The corundum particles comprise chemical components and mass percent：Al2O3≥94.0%，TiO2Less than or equal to 3.0 percent. The corundum fine powder comprises the following chemical components in percentage by mass and grain size: al (Al)2O3≥94.0%，TiO2Less than or equal to 3.0 percent and the granularity less than or equal to 200 meshes. The silicon carbide fine powder comprises the following chemical components in percentage by mass and particle size: SiC is more than or equal to 90.0 percent, and the granularity is less than or equal to 200 meshes. The scale graphite comprises the following chemical components in percentage by mass: c is more than or equal to 95.0 percent, and the granularity is less than or equal to 100 meshes. The additive comprises aluminum powder and silicon powder, wherein the aluminum powder comprises the following chemical components in percentage by mass and particle size: al is more than or equal to 98.0 percent, and the granularity is less than or equal to 200 meshes; the silicon powder comprises the following chemical components in percentage by mass and particle size: si is more than or equal to 97.0 percent, and the granularity is less than or equal to 200 meshes. The binder is liquid thermosetting phenolic resin.
Al containing the above regrind2O3The preparation method of the-SiC-C brick comprises the steps of preparing pug, forming by mechanical pressing and drying and baking, and specifically comprises the following steps: firstly, adding the reclaimed materials, the bauxite and the corundum as the particle raw materials, and mixing for 5min at the speed of 40 r/min; then adding 2/3 total amount of binder, and mixing at 40r/min speed for 5 min; adding crystalline flake graphite, and mixing at 40r/min for 5 min; then adding fine powder raw materials of corundum, silicon carbide and additives, and mixing for 5min at the speed of 40 r/min; finally adding the remaining 1/3 binding agent, and mixing at 160r/min for 40 min; forming the qualified pug on an electric screw press, and pressing to form a green body; drying the green blank at 210 ℃ for 8h to obtain Al containing the reclaimed material2O3-SiC-C brick products.
The normal temperature indexes of the product are as follows: compressive strength of 55MPa and volume density of 2.85g/cm3Apparent porosity 7.7%; the high temperature index is: the high temperature bending resistance of the carbon-embedded material is 6.2MPa at 1400 ℃ for 0.5 h. The lining refractory material is used as a lining refractory material for pretreating the foundry ladle, a 530 furnace is used for safe offline, the shape of steamed bread does not appear at the later stage of the furnace age, and no iron is infiltrated in a permanent layer during overhaul.
Example 2
The Al containing the reclaimed material provided by the embodiment2O3-SiC-C brick, differing from example 1 in that it comprises the following components in parts by weight:
20 parts of reclaimed material particles;
30 parts of high bauxite particles;
15 parts of corundum particles;
15 parts of corundum fine powder;
8 parts of silicon carbide fine powder;
10 parts of flake graphite;
2 parts of an additive;
4 parts of a binding agent.
The normal temperature indexes of the product are as follows: compressive strength of 50MPa and volume density of 2.86g/cm3Apparent porosity is 7.5%; the high temperature index is: the high temperature bending resistance of the carbon-embedded material is 6.5MPa at 1400 ℃ for 0.5 h. The lining refractory material is used as a lining refractory material for pretreating the foundry ladle, a 537 furnace is used for safe offline, the shape of steamed bread does not appear at the later stage of the furnace life, and no iron is infiltrated in a permanent layer during overhaul.
Example 3
The Al containing the reclaimed material provided by the embodiment2O3-SiC-C brick, differing from example 1 in that it comprises the following components in parts by weight:
25 parts of reclaimed material particles;
30 parts of high bauxite particles;
10 parts of corundum particles;
15 parts of corundum fine powder;
8 parts of silicon carbide fine powder;
10 parts of flake graphite;
2 parts of an additive;
4 parts of a binding agent.
The normal temperature indexes of the product are as follows: compressive strength of 56MPa and volume density of 2.78g/cm3Apparent porosity is 7.2%; the high temperature index is: the carbon-buried high-temperature bending resistance is 5.8MPa at 1400 ℃ for 0.5 h. The lining refractory material is used as a lining refractory material without a pretreated foundry ladle, a 1100 furnace is used for safe offline, a 'steamed bun shape' does not appear at the later stage of the furnace age, and no iron is infiltrated in a permanent layer during overhaul.
Example 4
The Al containing the reclaimed material provided by the embodiment2O3-SiC-C brick and its implementationExample 1 differs in that it comprises the following components in parts by weight:
25 parts of reclaimed material particles;
30 parts of high bauxite particles;
10 parts of corundum particles;
15 parts of corundum fine powder;
8 parts of silicon carbide fine powder;
10 parts of flake graphite;
2 parts of an additive;
4 parts of a binding agent.
The normal temperature indexes of the product are as follows: compressive strength of 52MPa and bulk density of 2.78g/cm3Apparent porosity 6.6%; the high temperature index is: the carbon-buried high-temperature bending resistance is 5.9MPa at 1400 ℃ for 0.5 h. The lining refractory material is used as a lining refractory material without a pretreated foundry ladle, a 1080 furnace is used for safe offline, a 'steamed bun shape' does not appear at the later stage of the furnace life, and no iron seeps into a permanent layer during overhaul.
Example 5
The Al containing the reclaimed material provided by the embodiment2O3-SiC-C brick, differing from example 1 in that it comprises the following components in parts by weight:
20 parts of reclaimed material particles;
30 parts of high bauxite particles;
15 parts of corundum particles;
15 parts of corundum fine powder;
8 parts of silicon carbide fine powder;
10 parts of flake graphite;
2 parts of an additive;
4 parts of a binding agent.
The normal temperature indexes of the product are as follows: compressive strength of 60MPa and volume density of 2.86g/cm3Apparent porosity 6.5%; the high temperature index is: the high temperature bending resistance of the carbon-embedded material is 6.7MPa at 1400 ℃ for 0.5 h. Used as lining refractory material for pretreating foundry ladle, and has the advantages of safe offline using 540 furnaces, no steamed bun shape at the later stage of furnace life, and no permanent layer during overhaulAnd (5) iron infiltration.
The action principle is as follows:
the thermal expansion of the refractory raw material is closely related to the crystal structure and chemical bond strength of the minerals contained therein. Minerals formed by ionic or covalent bonds, which have a low thermal expansion; the thermal expansion of the molecularly bonded minerals is very large. Generally, the tighter the structure of the mineral crystal, the greater its thermal expansion; and similar to amorphous glass, the thermal expansion is smaller. Thus, the thermal expansion of the refractory raw material depends on its chemical mineral composition. In common refractory materials, the coefficient of thermal expansion of mullite raw material (20-1000 ℃) is usually (4.5-5.5) multiplied by 10-6℃-1The thermal expansion coefficient of the super alumina or corundum material (20-1000 ℃) is usually (7.0-8.0) multiplied by 10-6℃-1。
The invention reasonably utilizes the thermal expansion coefficient of the raw material, changes the high-temperature thermal expansion rate and the residual expansion rate of the material, thereby improving the Al2O3-properties of SiC-C bricks. Post-use Al for pretreating foundry ladle or torpedo ladle2O3-SiC-C brick (i.e. brick residue), Al under the action of high temperature for a long time2O3And SiO2The reaction takes place to form mullite, part of the corundum phase having been converted to the mullite phase. The mineral phase of the material is changed, and the material shows different use performance. When the residual brick is processed into a reclaimed material according to the process, the method is applied to Al2O3Al containing recycled material in-SiC-C brick2O3the-SiC-C brick can embody the following two characteristics:
① part of Al2O3The introduction of the reclaimed material increases the mullite phase in the material, can reduce the high-temperature thermal expansion coefficient of the material, and improves the use effect of the later period of the furnace life of the foundry ladle. Existing Al2O3-SiC-C brick, Al2O3The corundum phase is mainly used, when the corundum phase is more than the corundum phase, the high-temperature thermal expansion of the material is larger, and when the mullite phase is more than the mullite phase, the high-temperature thermal expansion of the material is smaller. At the early furnace age, the corundum phase is more, and at the later furnace age, free Al in the material2O3And SiO2The subsequent reaction produces mullite, which begins to increase in phase due toThe high-temperature thermal expansion of the later-stage furnace age of the material is smaller than that of the earlier-stage furnace age, so that brick joints which are not healed in a thermal state exist in the later-stage furnace age of the foundry ladle, and the brick joints are corroded into visible brick joints and then develop into 'steamed bread-shaped'. Al containing reclaimed material in the invention2O3-SiC-C brick, Al2O3The material not only has corundum phase but also has mullite phase, and because the mullite phase is introduced into the material, the difference between the high-temperature thermal expansion of the material in the early stage and the later stage of the furnace life is small, the brick joints can not change in the high-temperature use process, namely, the brick joints of the latter material can not develop into erosion channels and can not become weak links, so that the Al containing the reclaimed material2O3When the-SiC-C bricks are used as lining materials, the using effect of the later period of the furnace life of the foundry ladle can be improved.
② part of Al2O3The introduction of the reclaimed material increases the mullite phase in the material, can improve the residual expansion rate of the material and reduce the possibility of iron infiltration of the permanent layer of the foundry ladle. The ladle is in a working environment with frequent alternation of cold and heat, and the ladle still has a plurality of unhealed brick joints at low temperature due to the inherent expansion and contraction properties of the material. In practical application, cold ladle iron connection often appears, and the possibility of permanent layer iron infiltration easily occurs in this time, and potential safety hazard exists. At high temperature, Al2O3And SiO2A reaction takes place to mullite, which reaction is accompanied by a volume effect of 8% to 12%. And conventional Al2O3Compared with the-SiC-C brick, the invention contains Al of the reclaimed material2O3Because a part of mullite phase is introduced in advance, the material is easy to react at high temperature to generate mullite, the mullite crystal phase is rapidly developed and grown, the residual expansion rate of the material is higher, and when the ladle is cooled from high temperature to low temperature, the brick joint of the later material in a cold state is smaller, so when the ladle is used for cold-cladding iron, Al containing the reclaimed material2O3When the-SiC-C bricks are used as lining materials, the possibility of iron infiltration of permanent layers of the foundry ladle can be reduced.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.

Claims (10)

1. Al containing reclaimed material2O3-SiC-C brick, characterized in that: the paint comprises the following components in parts by weight:
20-30 parts of reclaimed material particles;
30-40 parts of high-alumina bauxite particles;
10-20 parts of corundum particles;
10-20 parts of corundum fine powder;
5-15 parts of silicon carbide fine powder;
5-15 parts of flake graphite;
0-5 parts of an additive;
2-6 parts of a binding agent.
2. Al containing regrind according to claim 12O3-SiC-C brick, characterized in that: the reclaimed material particles comprise the following chemical components in percentage by mass: al (Al)2O3≥80.0%，SiC≤3.0%，C≤3.0%，SiO2≤10.0%，K2O+Na2O≤0.5%。
3. Al containing regrind according to claim 22O3-SiC-C brick, characterized in that: the reclaimed material particles are from lining materials during the overhaul of a pretreated foundry ladle or a torpedo ladle, and the raw material is selected from the raw brick layer materials and subjected to sorting, coarse crushing, impurity removal, light burning, granulation and classification to obtain qualified raw materials.
4. Al containing regrind according to claim 12O3-SiC-C brick, characterized in that: the high bauxite particle comprises the following chemical components in percentage by mass: al (Al)2O3≥85.0%，SiO2≤10.0%，K2O+Na2O≤0.5%。
5. According to the claimsClaim 1 said Al containing recycled material2O3-SiC-C brick, characterized in that: the corundum particles comprise the following chemical components in percentage by mass: al (Al)2O3≥94.0%，TiO2≤3.0%。
6. Al containing regrind according to claim 12O3-SiC-C brick, characterized in that: the corundum fine powder comprises the following chemical components in percentage by mass and grain size: al (Al)2O3≥94.0%，TiO2Less than or equal to 3.0 percent and the granularity less than or equal to 200 meshes.
7. Al containing regrind according to claim 12O3-SiC-C brick, characterized in that: the silicon carbide fine powder comprises the following chemical components in percentage by mass and particle size: SiC is more than or equal to 90.0 percent, and the granularity is less than or equal to 200 meshes.
8. Al containing regrind according to claim 12O3-SiC-C brick, characterized in that: the scale graphite comprises the following chemical components in percentage by mass: c is more than or equal to 95.0 percent, and the granularity is less than or equal to 100 meshes.
9. Al containing regrind according to claim 12O3-SiC-C brick, characterized in that: the additive comprises aluminum powder and silicon powder, wherein the aluminum powder comprises the following chemical components in percentage by mass and particle size: al is more than or equal to 98.0 percent, and the granularity is less than or equal to 200 meshes; the silicon powder comprises the following chemical components in percentage by mass and particle size: si is more than or equal to 97.0 percent, and the granularity is less than or equal to 200 meshes; the binding agent is liquid thermosetting phenolic resin.
10. Al containing regrind according to any one of claims 1 to 92O3The preparation method of the-SiC-C brick is characterized by comprising the following steps: the method comprises the steps of pug preparation, mechanical compression molding and drying baking, and specifically comprises the following steps:
firstly, adding the reclaimed materials, the bauxite and the corundum as the particle raw materials, and mixing for 3-5min at the speed of 30-50 r/min; the total amount of 2/3 is addedMixing the above materials at a speed of 30-50r/min for 3-5 min; adding crystalline flake graphite, and mixing at 30-50r/min for 3-5 min; then adding fine powder raw materials of corundum, silicon carbide and additives, and mixing for 3-5min at the speed of 30-50 r/min; finally, adding the remaining 1/3 binding agent, and mixing at the speed of 100-500r/min for 30-50 min; forming the qualified pug on an electric screw press, and pressing to form a green body; drying the green blank at 210 ℃ for 8h to obtain Al containing the reclaimed material2O3-SiC-C brick products.
CN202010227598.3A 2020-03-27 2020-03-27 Al containing reclaimed material2O3-SiC-C brick and preparation method thereof Pending CN111253166A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010227598.3A CN111253166A (en) 2020-03-27 2020-03-27 Al containing reclaimed material2O3-SiC-C brick and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010227598.3A CN111253166A (en) 2020-03-27 2020-03-27 Al containing reclaimed material2O3-SiC-C brick and preparation method thereof

Publications (1)

Publication Number Publication Date
CN111253166A true CN111253166A (en) 2020-06-09

Family

ID=70949894

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010227598.3A Pending CN111253166A (en) 2020-03-27 2020-03-27 Al containing reclaimed material2O3-SiC-C brick and preparation method thereof

Country Status (1)

Country Link
CN (1) CN111253166A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112239353A (en) * 2020-10-21 2021-01-19 江西博丰耐火材料有限公司 Lining brick for one-pot hot metal ladle and preparation process thereof
CN114180954A (en) * 2022-02-15 2022-03-15 北京利尔高温材料股份有限公司 Environment-friendly low-carbon aluminum-magnesium spinel brick and preparation method thereof
CN114873997A (en) * 2022-03-29 2022-08-09 内蒙古包钢利尔高温材料有限公司 Composite lining brick produced by recycling various waste refractory materials for torpedo ladle
CN115057693A (en) * 2022-08-18 2022-09-16 北京利尔高温材料股份有限公司 Tundish high-aluminum working lining dry material, working lining and preparation method thereof

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108101553A (en) * 2017-11-20 2018-06-01 武汉钢铁集团耐火材料有限责任公司 Fish torpedo ladle working lining brick using iron runner reworked material and preparation method thereof

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108101553A (en) * 2017-11-20 2018-06-01 武汉钢铁集团耐火材料有限责任公司 Fish torpedo ladle working lining brick using iron runner reworked material and preparation method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
徐平坤: "《刚玉耐火材料 第2版》", 30 June 2007, 冶金工业出版社 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112239353A (en) * 2020-10-21 2021-01-19 江西博丰耐火材料有限公司 Lining brick for one-pot hot metal ladle and preparation process thereof
CN114180954A (en) * 2022-02-15 2022-03-15 北京利尔高温材料股份有限公司 Environment-friendly low-carbon aluminum-magnesium spinel brick and preparation method thereof
CN114873997A (en) * 2022-03-29 2022-08-09 内蒙古包钢利尔高温材料有限公司 Composite lining brick produced by recycling various waste refractory materials for torpedo ladle
CN115057693A (en) * 2022-08-18 2022-09-16 北京利尔高温材料股份有限公司 Tundish high-aluminum working lining dry material, working lining and preparation method thereof

Similar Documents

Publication Publication Date Title
CN111253166A (en) Al containing reclaimed material2O3-SiC-C brick and preparation method thereof
CN100439290C (en) Alumina base andalusite-SiC-C brick, manufacturing method and its application
CN103467120B (en) Non-phosphorus and low-carbon alumina-magnesia unburned brick for stainless steel ladle and manufacturing method of brick
CN107352977A (en) A kind of slag line brick for ladle and preparation method
CN101654375B (en) Low-carbon magnesia carbon brick
CN109704774B (en) Preparation method of high-thermal-conductivity castable for hearth of blast furnace bottom instead of carbon brick
CN102557683A (en) Aluminum chrome refractory material
CN108863414B (en) High-performance magnesia carbon brick and preparation method thereof
CN102531643A (en) Gunning lining-making method for steel ladle
CN102603324A (en) Main channel material produced by adopting waste blast furnace main channel materials and machining process thereof
CN110683851A (en) Environment-friendly acid furnace lining dry type vibration material
CN104446547B (en) A kind of medium-frequency induction furnace furnace lining material and preparation method thereof and using method
CN108046814A (en) The blast furnace iron outlet groove quick-drying gravity flow pouring material prepared using discarded castable reworked material
CN112358302B (en) Self-repairing anhydrous stemming
CN105777148B (en) Coil daub for medium-frequency induction furnace and preparation method thereof
CN110981508A (en) Refractory ramming material for repairing bottom brick of hot-metal ladle and repairing method
CN103435359B (en) Thermal shock-resistant refractory castable material
CN101439976A (en) Composition for making submerged nozzle
CN105152662A (en) Dry ramming material for furnace body of medium-frequency induction furnace
CN110577397A (en) high-performance clay brick produced by waste clay brick and preparation method thereof
CN111348903A (en) Aluminum-carbon integral stopper rod and preparation method thereof
CN109534798A (en) 300 tons of ladle lashed area aluminium-magnesia carbon bricks of one kind and preparation method thereof
CN101417881A (en) Modified alumina-silicon carbide-carbon brick for torpedo type hot-metal bottle and method for producing the same
CN101423409A (en) Alumina-carbon lining brick for desulphurization hot-metal bottle and technique for producing the same
CN111004025A (en) Component of slag adhering resisting coating for ladle lining and preparation method thereof

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
RJ01 Rejection of invention patent application after publication

Application publication date: 20200609

RJ01 Rejection of invention patent application after publication