CN107473738A - A kind of foamed ceramics of refining molten metal and preparation method thereof - Google Patents

A kind of foamed ceramics of refining molten metal and preparation method thereof Download PDF

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CN107473738A
CN107473738A CN201710786418.3A CN201710786418A CN107473738A CN 107473738 A CN107473738 A CN 107473738A CN 201710786418 A CN201710786418 A CN 201710786418A CN 107473738 A CN107473738 A CN 107473738A
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foamed ceramics
molten metal
refining molten
powder
preparation
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魏耀武
岳瑞
陈俊峰
张涛
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Wuhan University of Science and Engineering WUSE
Wuhan University of Science and Technology WHUST
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Wuhan University of Science and Engineering WUSE
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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
    • C04B35/48—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 zirconium or hafnium oxides, zirconates, zircon or hafnates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B01D39/2068—Other inorganic materials, e.g. ceramics
    • B01D39/2093—Ceramic foam
    • 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
    • C04B35/03—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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
    • C04B35/057—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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on calcium oxide
    • 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
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/06—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances
    • C04B38/0615—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances the burned-out substance being a monolitic element having approximately the same dimensions as the final article, e.g. a porous polyurethane sheet or a prepreg obtained by bonding together resin particles
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/48—Organic compounds becoming part of a ceramic after heat treatment, e.g. carbonising phenol resins
    • 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
    • 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

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

Abstract

The present invention relates to a kind of foamed ceramics of refining molten metal and preparation method thereof.Its technical scheme is：First the zirconia powder of 10 ~ 80wt% calcium hydroxide powder, 10 ~ 80wt% zirconic acid calcium powder and 1 ~ 10wt% is mixed, obtains mixed powder；Additional 0.1 ~ the 3wt% of mixed powder additive and 30 ~ 100wt% water again, wet mixing, obtains slurry；Then polyurethane sponge is immersed in the slurry, extrudes 2 ~ 20min repeatedly, take out the polyurethane sponge containing slurry, extruded, dried 12 ~ 24 hours under the conditions of 200 ~ 300 DEG C, obtain foamed ceramics prefabricated section；Finally the foamed ceramics prefabricated section is inserted in heating furnace, is warming up to 1300 ~ 1600 DEG C, is incubated 1 ~ 5 hour, natural cooling, produces the foamed ceramics of refining molten metal.The present invention has the characteristics of technique is simple, cost and energy consumption are low, and the foamed ceramics temperature in use of prepared refining molten metal is high, it is good with hydration resistance to have stable high-temperature performance, suitable for high pure metal smelting filtering material.

Description

A kind of foamed ceramics of refining molten metal and preparation method thereof
Technical field
The invention belongs to foamed ceramics technical field.More particularly to foamed ceramics and its preparation of a kind of refining molten metal Method.
Background technology
The metal material of high cleanliness has excellent performance and special purposes, and metal bath is in founding or continuous casting mistake Cheng Zhong, due to the contact with furnace lining material, its degree of purity is inevitably affected, is in particular in metal material and deposits In certain oxide or non-oxidized substance field trash of different shapes, its quantity, size, form, type and distribution are to metal The influence of the intensity of material, plasticity and damaging property of toughness, metallic article is produced stomata, slag inclusion and crackle etc. and lack Fall into, metallic article is degraded using or even turn into the hidden danger of security incident when serious.Therefore, using simple and effective purification means The degree of purity for reducing the quantity of field trash and improving metal bath has been subjected to the attention of countries in the world enterprise and research and development institution.
The method currently used for metal bath purification mainly has optimization metallurgical technology, improves metallurgical equipment and use both at home and abroad Filter cleaning metal bath.Compared to first two method, there is a more obvious advantage using filter, its advantage is specially simple Effectively, it is general low with cost.The use condition of filter for molten metal is very harsh, it is desirable to which filter has enough high temperature strong Degree, heat resistanceheat resistant stability, resistance to metal wash away and not with fusant reaction.Conventional filter have fibrous filter net, straight hole filter and Ceramic honeycomb filter etc..Fibrous filter net, straight hole core pattern ceramic filter and amplifier case etc. exist elevated temperature strength compared with It is low, filter efficiency is not high, long-term use of temperature is low and metal bath crosses the problems such as flow rate is low.
Calcium oxide filter as Metal Melting studies have reported that and application, basic technology includes calcium oxide particle Prepare, be broken, grading, mixing, being molded and burn till, technique is cumbersome, especially in existing technical scheme, after high-temperature process The sinter layer of calcium oxide billet surface be destroyed in shattering process, new surface is exposed after broken, so as to cause oxygen Change easily aquation, the preparation of the deposit and calcium oxide filtering material of oxidizing calcium raw material of calcium particle and bring extreme difficulties.
In recent years, foamed ceramics is widely applied in casting industry, and the research and application of calcium oxide foamed ceramics start again It is valued by people, but the foamed ceramics of high oxidation calcium content is met in preparation process and changes or shrink excessive cause near water The problem of shape deformation, fail heavy industrialization application so far.
The content of the invention
It is contemplated that overcome prior art insufficient, it is therefore an objective to it is low to provide a kind of simple technique, preparation cost and energy consumption The preparation method of the foamed ceramics of refining molten metal, the foamed ceramics temperature in use of the refining molten metal prepared with this method It is high, have stable high-temperature performance it is good with hydration resistance, suitable for high pure metal smelting filtering material.
To achieve the above object, the technical solution adopted in the present invention is：First by 10 ~ 80wt% calcium hydroxide powder, 10 ~ The zirconia powder mixing of 80wt% zirconic acid calcium powder and 1 ~ 10wt%, obtains mixed powder；Additional 0.1 ~ the 3wt% of mixed powder adds again Add agent and 30 ~ 100wt% water, wet mixing, obtain slurry；Then polyurethane sponge is immersed in the slurry, repeatedly extrude 2 ~ 20min, the polyurethane sponge containing slurry is taken out, extruded；Polyurethane sponge after extruding dries 12 under the conditions of 200 ~ 300 DEG C ~ 24 hours, obtain foamed ceramics prefabricated section；Finally the foamed ceramics prefabricated section is inserted in heating furnace, it is warming up to 1300 ~ 1600 DEG C, 1 ~ 5 hour is incubated, natural cooling, produces the foamed ceramics of refining molten metal.
The Ca (OH) of the calcium hydroxide powder2Content >=95wt%；Particle diameter is 10 ~ 300 μm.
The CaZrO of the calcium zirconate powder3Content >=95wt%；Particle diameter is 10 ~ 300 μm.
The ZrO of the Zirconium powder2Content >=95wt%；Particle diameter is 10 ~ 300 μm.
The additive is one or more of calcium lignosulfonate and carboxymethyl cellulose；The particle diameter of the additive is 10~300μm。
Due to there is following good effect compared with prior art using above-mentioned technical proposal, the present invention：
The present invention produces the foamed ceramics of refining molten metal only with dipping, drying and process for calcining, thus technique it is simple, into This is low low with energy consumption.
It is of the invention to be contrasted with existing filter, ZrO2In-CaO systems oxide, zirconium oxide and calcium oxide are known oxidations The most stable of two oxides of thing high temperature performance, ZrO2- CaO systems foamed ceramics is bonded by covalent bond and complicated ionic bond And form stable crystal structure so that the foamed ceramics of refining molten metal has high temperature resistant, corrosion-resistant, better heat stability The advantages that, while its unique pore structure causes product to have the characteristics of specific surface area is high, fluid pressure loss is small, plus wherein Free calcium oxide has good adsorption effect to impurity in metal bath so that the foam pottery of prepared refining molten metal Porcelain has the characteristics of impurity efficiency high in adsorbing metal melt.Meanwhile in preparation process, make because calcium zirconate serves skeleton With, avoid because calcium hydroxide decomposition reaction and caused by foamed ceramics shrink it is excessive the problem of；Meanwhile zirconium oxide and calcium oxide Volumetric expansion caused by reaction at high temperature can also make up contraction of the foamed ceramics in sintering process, to high volume Stability is also helpful.
The foamed ceramics of refining molten metal prepared by the present invention is after testing：CaO content >=30wt%, cold crushing strength >=1MPa, under 50 DEG C and 90% damp condition, 10h is kept, after 110 DEG C of drying, aquation rate of body weight gain≤2% of foamed ceramics.
Therefore, the present invention has the characteristics of technique is simple, cost and energy consumption are low, the foam of prepared refining molten metal Ceramics have temperature in use is high, have stable high-temperature performance with hydration resistance it is good the advantages of, smelted suitable for high pure metal body used Filter material material.
Embodiment
With reference to embodiment, the present invention will be further described, not to the limitation of its protection domain.
It is now that the technical parameter Unify legislation involved by present embodiment is as follows to avoid repeating, in embodiment not Repeat again：
The Ca (OH) of the calcium hydroxide powder2Content >=95wt%；Particle diameter is 10 ~ 300 μm.
The CaZrO of the calcium zirconate powder3Content >=95wt%；Particle diameter is 10 ~ 300 μm.
The ZrO of the Zirconium powder2Content >=95wt%；Particle diameter is 10 ~ 300 μm.
The particle diameter of the additive is 10 ~ 300 μm.
Embodiment 1
A kind of foamed ceramics of refining molten metal and preparation method thereof.Its technical scheme is：First by 10 ~ 40wt% hydroxide The zirconia powder mixing of calcium powder, 50 ~ 80wt% zirconic acid calcium powder and 5 ~ 10wt%, obtains mixed powder；Again the additional mixed powder 0.1 ~ 1wt% additive and 30 ~ 50wt% water, wet mixing, obtain slurry；Then polyurethane sponge is immersed in the slurry, squeezed repeatedly 2 ~ 8min is pressed, takes out the polyurethane sponge containing slurry, is extruded；Polyurethane sponge after extruding is done under the conditions of 200 ~ 250 DEG C Dry 12 ~ 18 hours, obtain foamed ceramics prefabricated section；Finally the foamed ceramics prefabricated section is inserted in heating furnace, is warming up to 1300 ~ 1400 DEG C, 3 ~ 5 hours are incubated, natural cooling, produces the foamed ceramics of refining molten metal.
Additive described in the present embodiment is calcium lignosulfonate.
The foamed ceramics of refining molten metal manufactured in the present embodiment is after testing：CaO content is 30 ~ 35wt%, compressive resistance For 1.0 ~ 1.1MPa；Under 50 DEG C and 90% damp condition, 10h is kept, in 110 DEG C of drying, the aquation rate of body weight gain of foamed ceramics is 1.0~1.2%。
Embodiment 2
A kind of foamed ceramics of refining molten metal and preparation method thereof.The present embodiment is in addition to the additive, and remaining is the same as implementation Example 1：
Additive described in the present embodiment is carboxymethyl cellulose.
The foamed ceramics of refining molten metal manufactured in the present embodiment is after testing：CaO content is 35 ~ 40wt%, compressive resistance For 1.1 ~ 1.2MPa；Under 50 DEG C and 90% damp condition, 10h is kept, in 110 DEG C of drying, the aquation rate of body weight gain of foamed ceramics is 1.2~1.4%。
Embodiment 3
A kind of foamed ceramics of refining molten metal and preparation method thereof.The present embodiment is in addition to the additive, and remaining is the same as implementation Example 1：
Additive described in the present embodiment is the mixture of carboxymethyl cellulose and calcium lignosulfonate.
The foamed ceramics of refining molten metal manufactured in the present embodiment is after testing：CaO content is 40 ~ 45wt%, compressive resistance For 1.0 ~ 1.2MPa；Under 50 DEG C and 90% damp condition, 10h is kept, in 110 DEG C of drying, the aquation rate of body weight gain of foamed ceramics is 1.4~1.8%。
Embodiment 4
A kind of foamed ceramics of refining molten metal and preparation method thereof.Its technical scheme is：First by 50 ~ 80wt% hydroxide The zirconia powder mixing of calcium powder, 10 ~ 40wt% zirconic acid calcium powder and 5 ~ 10wt%, obtains mixed powder；Again the additional mixed powder 1 ~ 3wt% additive and 50 ~ 80wt% water, wet mixing, obtain slurry；Then polyurethane sponge is immersed in the slurry, squeezed repeatedly 8 ~ 14min is pressed, takes out the polyurethane sponge containing slurry, is extruded；Polyurethane sponge after extruding is done under the conditions of 250 ~ 300 DEG C Dry 18 ~ 24 hours, obtain foamed ceramics prefabricated section；Finally the foamed ceramics prefabricated section is inserted in heating furnace, is warming up to 1400 ~ 1500 DEG C, 2 ~ 3 hours are incubated, natural cooling, produces the foamed ceramics of refining molten metal.
Additive described in the present embodiment is calcium lignosulfonate.
The foamed ceramics of refining molten metal manufactured in the present embodiment is after testing：CaO content is 45 ~ 50wt%, compressive resistance For 1.0 ~ 1.1MPa；Under 50 DEG C and 90% damp condition, 10h is kept, in 110 DEG C of drying, the aquation rate of body weight gain of foamed ceramics is 1.2~1.4%。
Embodiment 5
A kind of foamed ceramics of refining molten metal and preparation method thereof.The present embodiment is in addition to the additive, and remaining is the same as implementation Example 4：
Additive described in the present embodiment is the mixture of calcium lignosulfonate and carboxymethyl cellulose.
The foamed ceramics of refining molten metal manufactured in the present embodiment is after testing：CaO content is 50 ~ 60wt%, compressive resistance For 1.2 ~ 1.3MPa；Under 50 DEG C and 90% damp condition, 10h is kept, in 110 DEG C of drying, the aquation rate of body weight gain of foamed ceramics is 1.4~1.6%。
Embodiment 6
A kind of foamed ceramics of refining molten metal and preparation method thereof.The present embodiment is in addition to the additive, and remaining is the same as implementation Example 4：
Additive described in the present embodiment is carboxymethyl cellulose.
The foamed ceramics of refining molten metal manufactured in the present embodiment is after testing：CaO content is 60 ~ 70wt%, compressive resistance For 1.1 ~ 1.2MPa；Under 50 DEG C and 90% damp condition, 10h is kept, in 110 DEG C of drying, the aquation rate of body weight gain of foamed ceramics is 1.8~2.0%。
Embodiment 7
A kind of foamed ceramics of refining molten metal and preparation method thereof.Its technical scheme is：First by 40 ~ 50wt% hydroxide The zirconia powder mixing of calcium powder, 40 ~ 50wt% zirconic acid calcium powder and 5 ~ 10wt%, obtains mixed powder；Again the additional mixed powder 1 ~ 2wt% additive and 80 ~ 100wt% water, wet mixing, obtain slurry；Then polyurethane sponge is immersed in the slurry, squeezed repeatedly 14 ~ 20min is pressed, takes out the polyurethane sponge containing slurry, is extruded；Polyurethane sponge after extruding is under the conditions of 200 ~ 230 DEG C Dry 18 ~ 24 hours, obtain foamed ceramics prefabricated section；Finally the foamed ceramics prefabricated section is inserted in heating furnace, is warming up to 1500 ~ 1600 DEG C, 1 ~ 2 hour is incubated, natural cooling, produces the foamed ceramics of refining molten metal.
Additive described in the present embodiment is calcium lignosulfonate.
The foamed ceramics of refining molten metal manufactured in the present embodiment is after testing：CaO content is 40 ~ 43wt%, compressive resistance For 1.0 ~ 1.1MPa；Under 50 DEG C and 90% damp condition, 10h is kept, in 110 DEG C of drying, the aquation rate of body weight gain of foamed ceramics is 1.4~1.5%。
Embodiment 8
A kind of foamed ceramics of refining molten metal and preparation method thereof.The present embodiment is in addition to the additive, and remaining is the same as implementation Example 7：
Additive described in the present embodiment is carboxymethyl cellulose.
The foamed ceramics of refining molten metal manufactured in the present embodiment is after testing：CaO content is 43 ~ 45wt%, compressive resistance For 1.1 ~ 1.2MPa；Under 50 DEG C and 90% damp condition, 10h is kept, in 110 DEG C of drying, the aquation rate of body weight gain of foamed ceramics is 1.5~1.6%。
Embodiment 9
A kind of foamed ceramics of refining molten metal and preparation method thereof.The present embodiment is in addition to the additive, and remaining is the same as implementation Example 7：
Additive described in the present embodiment is the mixture of calcium lignosulfonate and carboxymethyl cellulose.
The foamed ceramics of refining molten metal manufactured in the present embodiment is after testing：CaO content is 45 ~ 50wt%, compressive resistance For 1.2 ~ 1.3MPa；Under 50 DEG C and 90% damp condition, 10h is kept, in 110 DEG C of drying, the aquation rate of body weight gain of foamed ceramics is 1.6~1.7%
Embodiment 10
A kind of foamed ceramics of refining molten metal and preparation method thereof.Its technical scheme is：First by 15 ~ 45wt% hydroxide The zirconia powder mixing of calcium powder, 50 ~ 80wt% zirconic acid calcium powder and 1 ~ 5wt%, obtains mixed powder；Additional 1 ~ the 2wt% of mixed powder again Additive and 50 ~ 80wt% water, wet mixing, obtain slurry；Then polyurethane sponge is immersed in the slurry, repeatedly extrude 14 ~ 20min, the polyurethane sponge containing slurry is taken out, extruded；Polyurethane sponge after extruding dries 18 under the conditions of 200 ~ 230 DEG C ~ 24 hours, obtain foamed ceramics prefabricated section；Finally the foamed ceramics prefabricated section is inserted in heating furnace, it is warming up to 1500 ~ 1600 DEG C, 1 ~ 2 hour is incubated, natural cooling, produces the foamed ceramics of refining molten metal.
Additive described in the present embodiment is calcium lignosulfonate.
The foamed ceramics of refining molten metal manufactured in the present embodiment is after testing：CaO content >=30wt%, the resistance to pressure of normal temperature Degree >=1MPa, under 50 DEG C and 90% damp condition, 10h is kept, after 110 DEG C of drying, the aquation rate of body weight gain of foamed ceramics≤ 2%。
Present embodiment has following good effect compared with prior art：
The foamed ceramics of refining molten metal, therefore work is made only with dipping, drying and process for calcining in present embodiment Skill is simple, cost is low low with energy consumption.
Present embodiment contrasts with existing filter, ZrO2In-CaO systems oxide, zirconium oxide and calcium oxide are The known most stable of two oxides of oxide high temperature performance, ZrO2- CaO systems foamed ceramics be by covalent bond and it is complicated from Sub-key is bonded and forms stable crystal structure so that the foamed ceramics of refining molten metal has high temperature resistant, corrosion-resistant, hot steady The advantages that qualitative preferable, while its unique pore structure causes product to have the characteristics of specific surface area is high, fluid pressure loss is small, There is good adsorption effect to impurity in metal bath plus wherein free calcium oxide so that prepared refining molten metal Foamed ceramics there is the characteristics of impurity efficiency high in adsorbing metal melt.Meanwhile in preparation process, because calcium zirconate plays Skeleton function, avoid because calcium hydroxide decomposition reaction and caused by foamed ceramics shrink the problem of excessive；Meanwhile zirconium oxide With the reaction of calcium oxide at high temperature caused by volumetric expansion can also make up contraction of the foamed ceramics in sintering process, to height The stability of warm volume is also helpful.
The foamed ceramics of refining molten metal prepared by present embodiment is after testing：CaO content >=30wt%, normal temperature Compressive resistance >=1MPa, under 50 DEG C and 90% damp condition, 10h is kept, after 110 DEG C of drying, the aquation weightening of foamed ceramics Rate≤2%.
Therefore, present embodiment has the characteristics of technique is simple, cost and energy consumption are low, and prepared purification metal melts The foamed ceramics of body have temperature in use is high, have stable high-temperature performance with hydration resistance it is good the advantages of, suitable for high pure metal body Smelting filtering material.

Claims (6)

  1. A kind of 1. preparation method of the foamed ceramics of refining molten metal, it is characterised in that：First by 10 ~ 80wt% calcium hydroxide The zirconia powder mixing of powder, 10 ~ 80wt% zirconic acid calcium powder and 1 ~ 10wt%, obtains mixed powder；Again the additional mixed powder 0.1 ~ 3wt% additive and 30 ~ 100wt% water, wet mixing, obtain slurry；Then polyurethane sponge is immersed in the slurry, squeezed repeatedly 2 ~ 20min is pressed, takes out the polyurethane sponge containing slurry, is extruded；Polyurethane sponge after extruding is done under the conditions of 200 ~ 300 DEG C Dry 12 ~ 24 hours, obtain foamed ceramics prefabricated section；Finally the foamed ceramics prefabricated section is inserted in heating furnace, is warming up to 1300 ~ 1600 DEG C, 1 ~ 5 hour is incubated, natural cooling, produces the foamed ceramics of refining molten metal.
  2. 2. the preparation method of the foam ceramics of refining molten metal according to claim 1, it is characterised in that the calcium hydroxide The Ca (OH) of powder2Content >=95wt%；Particle diameter is 10 ~ 300 μm.
  3. 3. the preparation method of the foamed ceramics of refining molten metal according to claim 1, it is characterised in that the calcium zirconate The CaZrO of powder3Content >=95wt%；Particle diameter is 10 ~ 300 μm.
  4. 4. the preparation method of the foamed ceramics of refining molten metal according to claim 1, it is characterised in that the zirconium oxide The ZrO of powder2Content >=95wt%；Particle diameter is 10 ~ 300 μm.
  5. 5. the preparation method of the foamed ceramics of refining molten metal according to claim 1, it is characterised in that the additive For one or more of calcium lignosulfonate and carboxymethyl cellulose；The particle diameter of the additive is 10 ~ 300 μm.
  6. 6. the foamed ceramics ceramics of a kind of refining molten metal, it is characterised in that the foamed ceramics of the refining molten metal is root Melted according to the purification metal prepared by the preparation method of the foamed ceramics of refining molten metal any one of claim 1 ~ 5 The foamed ceramics of body.
CN201710786418.3A 2017-09-04 2017-09-04 A kind of foamed ceramics of refining molten metal and preparation method thereof Pending CN107473738A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111574224A (en) * 2020-05-28 2020-08-25 上海大学 Easily-removed ceramic core and preparation method and application thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104193396A (en) * 2014-08-21 2014-12-10 江苏南瓷绝缘子股份有限公司 Preparation method of foamed ceramic
CN106220218A (en) * 2016-07-25 2016-12-14 济南圣泉倍进陶瓷过滤器有限公司 A kind of ceramic foam filter and manufacture method thereof
CN106631121A (en) * 2017-01-05 2017-05-10 武汉科技大学 Calcium oxide foam ceramic and preparation method thereof
CN107056255A (en) * 2017-01-18 2017-08-18 武汉科技大学 A kind of calcium oxide filter and preparation method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104193396A (en) * 2014-08-21 2014-12-10 江苏南瓷绝缘子股份有限公司 Preparation method of foamed ceramic
CN106220218A (en) * 2016-07-25 2016-12-14 济南圣泉倍进陶瓷过滤器有限公司 A kind of ceramic foam filter and manufacture method thereof
CN106631121A (en) * 2017-01-05 2017-05-10 武汉科技大学 Calcium oxide foam ceramic and preparation method thereof
CN107056255A (en) * 2017-01-18 2017-08-18 武汉科技大学 A kind of calcium oxide filter and preparation method thereof

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CN111574224A (en) * 2020-05-28 2020-08-25 上海大学 Easily-removed ceramic core and preparation method and application thereof
CN111574224B (en) * 2020-05-28 2021-04-13 上海大学 Easily-removed ceramic core and preparation method and application thereof

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