CN104557061B - Straight-bore ceramic filter - Google Patents
Straight-bore ceramic filter Download PDFInfo
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- CN104557061B CN104557061B CN201310480233.1A CN201310480233A CN104557061B CN 104557061 B CN104557061 B CN 104557061B CN 201310480233 A CN201310480233 A CN 201310480233A CN 104557061 B CN104557061 B CN 104557061B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The present invention relates to a kind of cast steel straight-bore ceramic filter, the Al comprising 60%-80%2O3, 10%-25% SiO2, 5-15% ZrO2With the other alkali metal oxides for being no more than 1.0%.Preferably, crystal phase group does not carry out corundum as zirconium, and principal crystalline phase is mullite, and secondary crystal phase is tetragonal phase zirconium oxide, corundum phase and a small amount of monocline phase zircite；Wherein zirconium oxide, 5-15%；Mullite, 40%-75%；Corundum, 5%-50%；Glass phase≤5%.The straight-bore ceramic filter is resistant to anxious (straight) punching of 1700 DEG C of high-temperature molten steels without being crushed, and achievees the effect that purification of molten steel.
Description
Technical field
This law bright belonging silicate material, industrial ceramics field filter in molten steel in particular to a kind of casting technique
The straight-bore ceramic filter of impurity.
Background technique
The purification of molten metal plays an important role to the mechanical property for improving casting, and therefore, filtering technique is net in molten metal
It is particularly important to change aspect.Filter device currently used for molten metal purification is ceramic filter, can effectively be intercepted and captured in molten metal
Objectionable impurities simultaneously makes molten metal become laminar flow from turbulent flow, plays the role of purification and homogeneous.Ceramic filter can be divided into according to structure
Ceramic foam filter and straight-bore ceramic filter.The current filter for cast steel is entirely ceramic foam filter, and
And the preparation of the foam filter for cast steel all relies on zirconium oxide.Since zirconium oxide is a kind of rare metal oxide,
Although filter effect is good, fancy price seriously limits its extensive use in cast steel filtration art, is only intended to special type
The casting of steel or the steel or alloy of high added value.
There is the research of the foam filter of the other materials except zirconium oxide to report successively, such as zirconia toughened mullite body
The ceramic foam filter of system, Zirconium oxide plasticizing corundum system and corundum system is applied to the research report of cast steel and high temperature alloy
Road, but so far, cast steel and high temperature alloy with filter at present or oxidation zirconium base ceramic foam filter, other materials
System filtering of the batch production for cast steel and high temperature alloy not successfully.Selee company of the U.S. successively reports zirconium oxide increasing
Tough mullite system (75Al2O3·17ZrO2·8SiO2) and Zirconium oxide plasticizing corundum system (65PSZ35Al2O3) foam
Ceramic filter is used for the filtration, purification of molten steel；Hi-Tech company of the U.S. reports Zirconium oxide plasticizing corundum system (79Al2O3·
21ZrO2) and corundum system (98Al2O3·2SiO2) ceramic foam filter be used for molten steel filtration, purification；Britain Foseco
Company releases the filtration, purification that Zirconium oxide plasticizing corundum (ZTA) system ceramic foam filter is used for molten steel.Casting is made pottery with foam
The development of porcelain filter at home starts from the beginning of the eighties, and Harbin University of Science and Technology goes out to be used for 1650 DEG C in the tail period eighties
Within molten steel filtering ceramic foam filter, system be Zirconium oxide plasticizing corundum system (60Al2O3·11ZrO2·
28SiO2·0.8TiO2), wherein Zirconium powder is toughener, and titanium dioxide agent fire clay is sintering aid, aluminium dihydrogen phosphate
For binder；The later period eighties, electromechanical research designing institute in Hubei was successively proposed ZMF(zirconia toughened mullite system) and ZAF
Molten steel within the ceramic foam filter of (Zirconium oxide plasticizing corundum system) is used for lower than 1650 DEG C filters.In conclusion with
It is system containing zirconium in the ceramic foam filter of molten steel filtering, zirconia content is mostly in 15wt% or more, and zirconium oxide is with pure oxygen
Change zirconium powder to introduce, it is expensive, and it is lower than 1650 DEG C mostly using temperature.So far, it there is no cast steel molten metal
The relevant report of the straight-bore ceramic filter of filtering.
Straight-bore ceramic filter is the new ceramics filter developed in recent years, the good, cold and hot with appearance regularity
The features such as intensity is high, thermal shock resistance is good, lower production costs, but straight-bore ceramic filter is mainly used in molten iron, aluminium at present
The contaminant filter of the low-melting-point metals liquid such as alloy, copper and its alloy, in the filtration applications of the high-temperature liquid metals such as cast steel, there has been no phases
Product is closed to come out.Manufacturing method and the manufacture system of a kind of straight-bore ceramic filter are disclosed in Chinese patent 200810182753.3
System.The straight-bore ceramic filter is formed using mould pressing method, is only limitted to the low-temperature metals liquid such as filtering cast iron.Chinese Patent Application No.
201110271813.0 describing a kind of cast iron straight-bore ceramic filter of ceramic honey comb forming technique preparation.
This field needs a kind of straight-bore ceramic filtering of low-cost industrial applications that can effectively filter cast steel liquid
Device.
Summary of the invention
The purpose of the present invention is to provide a kind of filterings of the zirconia toughened mullite corundum system straight-bore ceramic of low cost
Device.The straight-bore ceramic filter is low in cost, and the introducing of zirconium oxide introduces by way of zircon corundum brick polishes leftover bits and pieces, former material
Expect it is low in cost, by compression molding technology or using ceramic honey comb extrusion technology form, can through high temperature single sintering
Anxious (straight) punching of resistance to 1700 DEG C of high-temperature molten steels reaches purification of molten steel effect without being crushed.
Cast steel and high temperature alloy of the invention has following chemical component with straight-bore ceramic filter:
In a specific embodiment, the crystal phase composition of the straight-bore ceramic filter is as follows:
In further embodiment, the raw material quality percentage that filter uses are as follows:
ZrO2The zircon corundum brick of content >=5% polishes leftover bits and pieces 45%-100%
Al2O3The schmigel 0%-50% of content >=98%
Al2O3The kaolin 0%-10% of content >=30%
Wherein at least comprising zircon corundum brick polishing leftover bits and pieces, kaolin, two or more in schmigel, and each raw material
The sum of ingredient is 100%.
As the improvement to aforementioned various schemes, it is raw materials used in, zircon corundum brick polish leftover bits and pieces partial size be greater than 1000
Mesh；Kaolinic partial size is greater than 500 mesh；The partial size of aluminium oxide is greater than 325 mesh.
As the improvement to aforementioned various schemes, straight-bore ceramic filter green body thickness is according to outer dimension size variation model
It encloses for 15-25mm.
As the improvement to aforementioned various schemes, the muscle thickness of filter is 0.8-1.3mm, more preferably 0.9-1.2mm it
Between.
The present invention obtains the straight-bore ceramic filter of zirconia toughened mullite corundum for the first time, which can be resistant to
The molten steel impact of 1700 DEG C or higher temperature has good thermal shock resistance without broken, moreover, the filter have it is good
Filtering function, in molten steel 70% or more impurity can be filtered out.
Specific embodiment
Unless otherwise stated, term used in context of the invention has meaning given below.Do not have herein
There are other terms for specifically giving meaning that there is its common meaning in the art.So-called raw material is inorganic material in the present invention
The general name of material, not comprising the organic additive added in manufacture craft.The straight hole filter provided according to the present invention by weight by
Following component composition:
Above-mentioned other alkali metal oxides are not introduced for specific purpose, are due to golden containing a small amount of alkali in main material
The reason of belonging to oxide.Present invention eliminates the technical solutions containing other compositions.Inventors have found that straight with above-mentioned composition
Its refractoriness of hole ceramic filter be much higher than 1750 DEG C, and have lower thermal expansion coefficient, high-heat resistance shock resistant and it is stronger often
Temperature, high temperature mechanical strength can be resistant to anxious (straight) punching of 1700 DEG C of high-temperature steel aqueous without rupturing.A feature of the present invention is
Aluminium oxide comprising being not less than 60%, too low alumina content can make product glass phase more, and product refractoriness is caused to decline；
Excessively high alumina content will affect the conversion of mullite, and thermal expansion coefficient increases, and thermal shock resistance reduces, applied at elevated temperature performance
Decline.In addition, the straight hole filter with the formula has acceptable cost, the cast steel enterprise be conducive at home is extensive
It uses.
Straight-bore ceramic filter of the invention has phase composition below as a preferred implementation manner:
In the present invention, glass phase is constantly present, since raw material always contains alkaline metal oxide, they can and it is indefinite
Shape silica forms eutectic compound and exists in the form of glass phase, but amount of glassy phase is no more than 5%.
In product of the invention, principal crystalline phase is mullite, and mullite has good high-temperature mechanics and high temperature heating power
Performance is learned, there is elevated temperature strength is high, high temperature creep rate is low, thermal expansion coefficient is low, resistance to chemical attack is strong, thermal shock resistance is high etc.
Feature；Secondary crystal phase is tetragonal phase zirconium oxide, corundum phase and a small amount of monocline phase zircite.Wherein, corundum have cold and hot intensity it is high,
The features such as resistance to chemical attack is strong；Along with the variation of volume and shape when zirconium oxide generation martensitic traoformation, energy is absorbed, is subtracted
Slow crack tip stress is concentrated, and the extension of crackle is prevented, to improve the toughness of product.
In further preferred embodiment, zirconium oxide introduces in the form of zircon corundum brick polishes leftover bits and pieces.In plate
The fields such as glass, zircon corundum brick need to mix partial mill material to surface polishing treatment when preparing, and thus generate a large amount of ultra-fine
Powder forms leftover bits and pieces, and often more than 1000 mesh, this patent is not excluded for being crushed by defective and discarded zircon corundum brick partial size
Other powders formed.The leftover bits and pieces is used to the present invention to have the advantage that, since diameter of particle is tiny, silica therein
Easily with oxidation reactive aluminum, mullite synthesizing at low temperature, simultaneously because the presence of zirconia particles inhibits abnormal grain growth.
Using zircon corundum brick polishing leftover bits and pieces, schmigel and fire clay as raw material, prepared by compression molding or extrusion molding mode
Green body, the straight-bore ceramic filter through high temperature sintering synthesis zirconia toughened mullite corundum, the straight-bore ceramic filter group
As zirconia toughened mullite (ZTM) and ZTA(Zirconium oxide plasticizing corundum).With resistance to suddenly cold and hot, cold and hot mechanical strength
Height, heat shock resistance power is strong, and resistance to slag is strong, and loading inversion point is high, and rotten with high chemical stability and extremely strong anti-chemistry
The features such as corrosion.
In other embodiments, the raw material of straight hole filter is prepared other than zircon corundum brick polishes leftover bits and pieces, may be used also
To use the ball milling powder of the useless brick of fused alumina zirconia of other forms, zirconia content and purity are much higher than polishing leftover bits and pieces；Or by
Zircon sand, silica, kaolin, schmigel, mullite powder etc. are made, and can need according to component content to above-mentioned raw materials
It is assembled.
In a preferred embodiment of the invention, zircon corundum brick polishing leftover bits and pieces is ZrO2The mud sediment of content >=5%
Object；Aluminium oxide is Al2O3The high-temperature calcination aluminium oxide of content >=98%, corundum phase content >=95%；Kaolin is Al2O3Content >=
30% clay mineral, such as purple mesh section, kaolin can be selected arbitrarily one such or two kinds.
In typical embodiment of the invention, raw materials used includes following ingredients, is wherein at least thrown comprising zircon corundum brick
Two or more in light leftover bits and pieces, kaolin and schmigel, and the sum of each material composition is 100%:
ZrO2Content >=15-17%% zircon corundum brick polishes leftover bits and pieces 45%-100%
Al2O3The schmigel 0%-50% of content >=98%
Al2O3The kaolin 0%-10% of content >=30%.
It is mainly former with zircon corundum brick polishing leftover bits and pieces, aluminium oxide, clay in another exemplary embodiments of the invention
Material is formed required zirconium source wherein being provided with fused alumina zirconia polishing leftover bits and pieces, and provides corresponding aluminium oxide and silica, clay
Aluminium oxide and silica are provided, synthesize zirconium oxide plasticizing mullite ceramic and Zirconium oxide plasticizing corundum pottery during the sintering process
Porcelain.
It is preferred that the partial size to above-mentioned raw materials is selected, and such as: the partial size that zircon corundum brick polishes leftover bits and pieces is greater than 1000 mesh；
Kaolinic partial size is greater than 500 mesh；The partial size of aluminium oxide is greater than 325 mesh.It is matched, can be promoted using the material of above-mentioned partial size
Mullitization into product sintering process improves the applied at elevated temperature performance of product.
Mistake of the invention can be prepared using the die press technology for forming disclosed in Chinese invention patent 200810182753.3
Filter, preparing can be also comprising suitable water-reducing agent, binder and release agent etc. in raw material.Water-reducing agent is sodium humate, trimerization
One of sodium phosphate, calgon are a variety of；Binder is one of polyvinyl alcohol, methylcellulose or a variety of；It is de-
Mould agent is one of hard hydrochlorate, oil emulsion, emulsified wax or a variety of.Raw mineral materials and additive are invested in ball in proportion
It is granulated in mist projection granulating tower after wet ball grinding in grinding machine, is formed using the formation system introduced in patent 200810182753.3
It is sintered at a certain temperature afterwards up to straight-bore ceramic filter.
The ceramic honey comb extrusion molding process system that can also be disclosed using Chinese invention patent application 201110271813.0
Standby filter of the invention, prepares and should also contain suitable binder, plasticizer, lubricant etc. in raw material.Common binder
Including one of hydroxypropyl methyl cellulose, methylcellulose or tung oil or a variety of, but the invention is not restricted to this, binder
Introduction volume be usually between the 3%-11% of raw material；Common plasticizer includes one of PVA, tung oil, soybean oil, hydraulic oil
Or it is a variety of, but the invention is not restricted to this, and additional amount is usually the 3%-8% of raw material；Common lubricant includes soybean oil, dish
One of oil, hydraulic oil are a variety of, and but the invention is not restricted to this, introduction volume 3%-8%.In order to prepare production of the invention
Product, according to known method, by each mineral by required requirement difference ball milling sieving, then by certain predetermined ratio and appropriate bonding
Agent ingredient, after mixing, the water that moderate lubrication agent and 14%-22% is added is mediated.Pug after kneading through it is thick it is experienced, aging,
Concise, molding, box drying chamber circulation warm air drying, cutting, soot blowing, is burnt at the sizing of box microwave to obtain the final product.
In the present invention, green body thickness 15-25mm, preferred thickness 20-25mm, typical thickness are 22 and 25mm.This hair
Between bright filter preferred muscle thickness 0.8-1.3mm, more preferable 0.9-1.2mm.Enough thickness enables product to bear 1700
DEG C high-temperature molten steel is flung without broken.
By green body after molding pile up in high-temperature fuel gas formula tunnel oven, 1450-1550 DEG C at a temperature of fire.
The pass of molding type straight-bore ceramic filter is circular hole, and the pass of extruded type straight-bore ceramic filter is circular hole, side
Hole, hexagonal hole.The parameters such as filter cross-section shape, pass, aperture (width), muscle thickness can need Combination Design according to client.
Embodiment 1:
Stock: it is public that zircon corundum brick polishes leftover bits and pieces (1000 mesh, zirconia content >=12%, alumina content >=60%) 170
Jin, 20 kilograms of schmigel (325 mesh, alumina content >=99%, corundum phase content >=95%), Kaolin of Suzhou (500 mesh, oxidation
Aluminium content >=30%, dioxide-containing silica >=45%) 10 kilograms, 10 kilograms of aqueous solution of polyvinyl alcohol (PVA content >=6%) emulsifies stone
1.5 kilograms of wax (commercially available technical grade), 0.7 kilogram of sodium tripolyphosphate (commercially available technical grade) add water 120 kg, ball milling 6 hours, make
For at slurry；
Press atomization is granulated: the press atomization Granulation Equipments introduced using patent 200810182753.3, atomisation pressure control
System is in 1.2MPa, nozzle diameter 1.2mm, the control of gained granulation material moisture 2~4%, the bulk density of granulation material 0.95~
1.1g/cm3;
Compression molding: above-mentioned powder is packed into Φ 50mm, pass circular hole, in the mold cavity of aperture 2.8mm, with JT-5 type
Hydraulic forming machine compression moulding, 4 tons of briquetting pressure, pressed semi-finished product blank density reaches 1.55g/cm3More than；
Sintering: being burnt into using intermittent combustion gas shuttle kiln, and 1450 DEG C/2h of the highest temperature is burnt into upright up to zirconium mullite corundum
Hole ceramic filter；
Verifying: the filter is by the 1650 DEG C of pyrocarbon molten steel 100Kg filtering tests of 500mm pouring head, and filter is not
It is damaged.By reducing 70-80% to the molten steel composition analysis of casting front and back and Micro-Structure Analysis, impurity content.The electricity of the sample is competing
Scanned photograph is shown in Fig. 1.
Embodiment 2:
Straight-bore ceramic filter is having a size of 75mm*75mm*20mm, and pass is 3.0mm*3.0mm square hole, muscle thickness 1.0mm.
Zircon corundum brick polishing leftover bits and pieces (partial size is less than 1000 mesh), aluminium oxide (partial size is less than 325 mesh) after ball milling is sieved, Suzhou are high
The raw material that ridge soil (partial size is less than 500 mesh) weight proportion is 85:10:5 is mixed into 200Kg, the hydroxypropyl of additional raw material weight 4%
Mixing 2 hours, after sieving with 100 mesh sieve, water, 3% tung oil and 3% rape oil of raw material gross weight 18% was added in methylcellulose,
20min is mediated in kneader, sealed after pug mill pugging 3 times it is 18-24 hours aging, it is aging after pug through vacuum pugging
Afterwards, above-mentioned filter corresponding mould extrusion molding is selected.It is box at 60 DEG C -120 DEG C after box type microwave oven is formed to squeeze out green body
Carry out circulation warm air drying in drying chamber, it is dry after green body be cut into respective thickness, 1480 DEG C/2h is burnt in pushed bat kiln after soot blowing
At up to 75mm*75mm*20mm(3.0mm*3.0mm) zirconium mullite corundum straight-bore ceramic filter.The filter passes through
The 1650 DEG C of pyrocarbon molten steel 300Kg filtering tests of 500mm pouring head, filter be not damaged.By to casting front and back molten steel at
Analysis and Micro-Structure Analysis, impurity content reduce 70-80%.The competing scanned photograph of electricity of the sample is shown in Fig. 2.
Embodiment 3:
Stock: it is public that zircon corundum brick polishes leftover bits and pieces (1000 mesh, zirconia content >=12%, alumina content >=60%) 190
Jin, 10 kilograms of Kaolin of Suzhou (500 mesh, alumina content >=30%, dioxide-containing silica >=45%), (PVA contains polyvinyl alcohol
Amount >=6%) 10 kilograms of aqueous solution, 1.5 kilograms of emulsified wax (commercially available technical grade), 0.7 public affairs of sodium tripolyphosphate (commercially available technical grade)
Jin, adds water 120 kg, ball milling 6 hours, is prepared into slurry；
Press atomization is granulated: the press atomization Granulation Equipments introduced using patent 200810182753.3, atomisation pressure control
System is in 1.2MPa, nozzle diameter 1.2mm, the control of gained granulation material moisture 2~4%, the bulk density of granulation material 0.95~
1.1g/cm3;
Compression molding: being packed into 100mm*60*22mm for above-mentioned powder, pass circular hole, in the mold cavity of aperture 3.0mm,
With JT-5 type hydraulic forming machine compression moulding, 4 tons of briquetting pressure, pressed semi-finished product blank density reaches 1.55g/cm3More than；
Sintering: being burnt into using intermittent combustion gas shuttle kiln, and 1480 DEG C/2h of the highest temperature is burnt into upright up to zirconium mullite corundum
Hole ceramic filter；
Verifying: the filter is by the 1650 DEG C of pyrocarbon molten steel 300Kg filtering tests of 500mm pouring head, and filter is not
It is damaged.By reducing 70-80% to the molten steel composition analysis of casting front and back and Micro-Structure Analysis, impurity content.The electricity of the sample is competing
Scanned photograph is shown in Fig. 3.
Embodiment 4:
Straight-bore ceramic filter is 100mm*100mm*25mm, and pass is 3.3mm circular hole, muscle thickness 1.2mm.Using fused alumina zirconia
Brick polishing leftover bits and pieces (1000 mesh, zirconia content >=12%, alumina content >=60%), (partial size is less than 500 for Kaolin of Suzhou
Mesh) weight proportion be 95:5 raw material be mixed into 200Kg, the hydroxypropyl methyl cellulose of additional raw material weight 4%, ball milling 2 is small
When, after sieving with 100 mesh sieve, the water of raw material gross weight 18%, 6% soybean oil is added, 20min is mediated in kneader, through pug mill
Sealed after pugging 3 times it is 18-24 hours aging, it is aging after pug after vacuum pugging, select above-mentioned filter corresponding mould squeeze
It forms out.It squeezes out green body and carries out circulation warm air drying in 60 DEG C -120 DEG C box drying chambers after box type microwave oven is formed, it is dry
Green body afterwards is cut into respective thickness, and 1500 DEG C/2h is burnt into and makes pottery up to zirconium mullite corundum straight hole in pushed bat kiln after soot blowing
Porcelain filter.For the filter by the 1700 DEG C of pyrocarbon molten steel 650Kg filtering tests of 500mm pouring head, filter is not damaged.
By reducing 70-80% to the molten steel composition analysis of casting front and back and Micro-Structure Analysis, impurity content.The competing scanning of electricity of the sample
Photo is shown in Fig. 4.
If although disclosed herein prepare dry-eye disease with typical raw material and typical preparation method, and achieving expection
Effect, but those skilled in the art are protected it is contemplated that may also prepare product of the present invention content using other raw materials
It within the scope of shield, or even achieves better than technical effect of the invention, these are encompassed by claims limited range
Within.
Claims (4)
1. a kind of cast steel straight-bore ceramic filter, characterized in that the straight-bore ceramic filter chemical component are as follows:
Wherein, zirconia source polishes leftover bits and pieces from zircon corundum brick, or blocky defective zircon corundum brick is formed after crushing
Fused alumina zirconia powder, partial size 1000 mesh or more than, the described straight-bore ceramic filter crystal phase composition is as follows:
2. cast steel straight-bore ceramic filter as described in claim 1, characterized in that the raw material quality percentage of use
Are as follows:
ZrO2The zircon corundum brick of content >=5% polishes leftover bits and pieces 45%-100%
Al2O3The schmigel 0%-50% of content >=98%
Al2O3The kaolin 0%-10% of content >=30%
Wherein at least comprising two or more in zircon corundum brick polishing leftover bits and pieces, kaolin and schmigel, and each raw material at
/ and be 100%.
3. cast steel straight-bore ceramic filter as described in claim 1, it is characterized in that zircon corundum brick polishing leftover bits and pieces is selected to make
For zirconium source, wherein contain zirconium oxide, aluminium oxide and silica in zircon corundum brick polishing leftover bits and pieces.
4. cast steel straight-bore ceramic filter as described in claim 1, characterized in that green body thickness 15-25mm, filter
Muscle thickness is 0.8-1.3mm.
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| CN104944984B (en) * | 2015-06-19 | 2017-03-01 | 武汉科技大学 | A kind of continuous casting production ceramic filter and preparation method thereof |
| CN104926331B (en) * | 2015-06-19 | 2017-03-01 | 武汉科技大学 | A kind of continuous casting production renewable ceramic filter and preparation method thereof |
| CN109694241A (en) * | 2018-11-09 | 2019-04-30 | 长沙县新光特种陶瓷有限公司 | A kind of castable refractory |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101691296A (en) * | 2009-09-24 | 2010-04-07 | 中山市华山特种陶瓷有限公司 | Zircon corundum ceramics |
| CN102992781A (en) * | 2011-09-14 | 2013-03-27 | 济南圣泉倍进陶瓷过滤器有限公司 | Casting-use straight-hole ceramic filter and preparation method thereof |
| CN103193266A (en) * | 2013-04-08 | 2013-07-10 | 王建坤 | Method for producing zirconium-aluminum composite oxide by utilizing waste zirconium-containing refractory material |
-
2013
- 2013-10-15 CN CN201310480233.1A patent/CN104557061B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101691296A (en) * | 2009-09-24 | 2010-04-07 | 中山市华山特种陶瓷有限公司 | Zircon corundum ceramics |
| CN102992781A (en) * | 2011-09-14 | 2013-03-27 | 济南圣泉倍进陶瓷过滤器有限公司 | Casting-use straight-hole ceramic filter and preparation method thereof |
| CN103193266A (en) * | 2013-04-08 | 2013-07-10 | 王建坤 | Method for producing zirconium-aluminum composite oxide by utilizing waste zirconium-containing refractory material |
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