JP2813039B2 - Filter material for molten metal and method for producing the same - Google Patents
Filter material for molten metal and method for producing the sameInfo
- Publication number
- JP2813039B2 JP2813039B2 JP2164474A JP16447490A JP2813039B2 JP 2813039 B2 JP2813039 B2 JP 2813039B2 JP 2164474 A JP2164474 A JP 2164474A JP 16447490 A JP16447490 A JP 16447490A JP 2813039 B2 JP2813039 B2 JP 2813039B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- inorganic binder
- filter medium
- molten metal
- aggregate particles
- 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.)
- Expired - Lifetime
Links
Classifications
-
- 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
- B01D39/2072—Other inorganic materials, e.g. ceramics the material being particulate or granular
- B01D39/2075—Other inorganic materials, e.g. ceramics the material being particulate or granular sintered or bonded by inorganic agents
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は金属溶湯、特にアルミニウム溶湯中に含まれ
る不純物（介在物）を濾過するに適した金属溶湯用濾材
に関する。Description: TECHNICAL FIELD The present invention relates to a metal melt filter medium suitable for filtering impurities (inclusions) contained in a molten metal, particularly an aluminum molten metal.
［従来の技術］ 金属の薄板や箔は金属溶湯をインゴットに鋳造し、こ
れを圧延することにより製造される。ところが、金属溶
湯に含まれる金属酸化物や耐火物の微小破片等の固形不
純物がそのままインゴット中に混入すると、これを圧延
して薄板や箔等を製造する過程でピンホール、表面欠陥
が発生することがある。これを防ぐためには、溶湯中か
ら固形不純物を除去する必要があり、そのため、例えば
特公昭52−22327号公報で示されるように、炭化珪素や
アルミナ等の骨材粒子を無機質結合材により結合させて
骨材粒子間に無数の微細連続気孔を形成した構成のチュ
ーブ状の濾材が使用されている。この濾材によれば、目
詰まりを長期間にわかり防止でき、また捕獲した不純物
の流出がなく、しかも気孔径を適切になし得て精密な濾
過が可能になるという利点がある。[Prior Art] A metal thin plate or foil is produced by casting a molten metal into an ingot and rolling it. However, when solid impurities such as metal oxides contained in the molten metal and minute pieces of refractory are directly mixed into the ingot, pinholes and surface defects are generated in the process of rolling and manufacturing thin plates and foils. Sometimes. In order to prevent this, it is necessary to remove solid impurities from the molten metal. For this reason, as shown in, for example, Japanese Patent Publication No. 52-22327, aggregate particles such as silicon carbide and alumina are bound by an inorganic binder. Thus, a tubular filter medium having a structure in which countless fine continuous pores are formed between aggregate particles is used. According to this filter medium, there is an advantage that clogging can be prevented for a long time, captured impurities do not flow out, and the pore size can be appropriately adjusted to enable precise filtration.
［発明が解決しようとする課題］ 上記したように、特公昭52−22327号公報記載の濾材
は優れたものであるが、この濾材にあっても、骨材粒子
の結合材中にSiO2を含むため、濾過中に溶湯にシリコン
が溶出する溶湯汚染（シリコンピックアップ）や耐蝕性
の点で問題があった。[Problems to be Solved by the Invention] As described above, the filter medium described in JP-B-52-22327 is excellent, but even in this filter medium, SiO 2 is contained in the binder of the aggregate particles. Therefore, there is a problem in terms of melt contamination (silicon pickup) in which silicon elutes into the melt during filtration and corrosion resistance.
「課題を解決するための手段」 従って、本発明は上記した特公昭52−22327号公報記
載の濾材をさらに改良した金属溶湯用濾材を提供するこ
とを目的とする。"Means for Solving the Problems" Accordingly, an object of the present invention is to provide a filter medium for molten metal obtained by further improving the filter medium described in JP-B-52-22327.
そしてその目的は、本発明によれば、セラミック骨材
粒子を無機質結合材により結合させた多孔質の濾材であ
って、該骨材粒子としてTiO2を2.0重量％以上含有する
溶融アルミナ粒子を用いるとともに、その組成がSiO235
〜50重量％、B2O39〜20重量％、MgO10〜15重量％、CaO5
〜10重量％で残部がAl2O3である無機質結合材を用い、
かつ該骨材粒子100重量部に対して該無機質結合材を５
〜20重量部配合してなることを特徴とする金属溶湯用濾
材、および、セラミック骨材粒子を無機質結合材により
結合させることにより多孔質の金属溶湯用濾材を製造す
るに当り、TiO2を2.0重量％以上含有する溶融アルミナ
粒子を骨材粒子とし、この骨材粒子100重量部に対し、S
iO235〜50重量％、B2O39〜20重量％、MgO10〜15重量
％、CaO5〜10重量％で残部がAl2O3の組成を有する無機
質結合材５〜20重量部を配合した後混練し、得られた混
練物を成形、乾燥した後、この成形体を1200〜1450℃の
温度にて焼成することを特徴とする金属溶湯用濾材の製
造方法、により達成される。According to the present invention, there is provided a porous filter medium in which ceramic aggregate particles are bonded by an inorganic binder, wherein fused alumina particles containing TiO 2 in an amount of 2.0% by weight or more are used as the aggregate particles. With the composition of SiO 2 35
50 wt%, B 2 O 3 9~20 wt%, MgO10~15 wt%, CaO5
Using an inorganic binding material of which the balance is Al 2 O 3 at ~ 10% by weight,
And 5 parts of the inorganic binder per 100 parts by weight of the aggregate particles.
~ 20 parts by weight of a metal melt filter medium, and a porous metal melt filter medium produced by binding ceramic aggregate particles with an inorganic binder, TiO 2 is 2.0% by weight. The fused alumina particles containing not less than 10% by weight are defined as aggregate particles.
iO 2 35 to 50 wt%, B 2 O 3 9 to 20 wt%, MgO10～15 wt%, compounded inorganic binder 5-20 parts by weight having a composition balance of Al 2 O 3 in CaO5~10 wt% And then kneading, molding and drying the obtained kneaded material, and then firing the molded body at a temperature of 1200 to 1450 ° C., which is achieved by a method for producing a filter material for a molten metal.
［作用］ 本発明においては、TiO2を2.0重量％以上含有する溶
融アルミナ粒子を骨材粒子とし、これに特定組成の無機
質結合材を所定量配合させたことに特徴を有する。[Function] The present invention is characterized in that fused alumina particles containing TiO 2 in an amount of 2.0% by weight or more are used as aggregate particles, and a predetermined amount of an inorganic binder is mixed with the aggregate particles.
このような構成を有するため、得られる濾材は強度が
大きく、しかも捕集性能が良好なものとなる。Due to such a configuration, the obtained filter medium has high strength and good collection performance.
本発明で骨材粒子として用いる溶融アルミナ粒子は、
溶融した無機質結合材と濡れ易く、しかもTiO2を2.0重
量％以上含有するため、結合材との焼結性を高め、強度
を上げることができる。溶融アルミナ粒子のTiO2含有量
が2.0重量％未満では、得られる濾材の強度が低くな
り、好ましくない。Fused alumina particles used as aggregate particles in the present invention,
Since it easily wets with the molten inorganic binder and contains TiO 2 in an amount of 2.0% by weight or more, the sinterability with the binder and the strength can be increased. If the TiO 2 content of the fused alumina particles is less than 2.0% by weight, the strength of the obtained filter medium will be low, which is not preferable.
また、骨材粒子に対し添加する無機質結合材は、骨材
粒子100重量部に対し５〜20重量部の範囲が好ましい。
無機質結合材の配合量が５重量部未満の場合には、強度
が低くしかも濾材からの骨材の脱粒が生じるという問題
があり、一方無機質結合材の配合量が20重量部を超える
と濾材の気孔が減少して早期に目詰まりを起こし、通湯
量がなくなるので好ましくない。The amount of the inorganic binder added to the aggregate particles is preferably in the range of 5 to 20 parts by weight based on 100 parts by weight of the aggregate particles.
If the amount of the inorganic binder is less than 5 parts by weight, there is a problem that the strength is low and the aggregates are shed from the filter medium. On the other hand, if the amount of the inorganic binder exceeds 20 parts by weight, the filter It is not preferable because pores are reduced and clogging occurs early, and the amount of hot water is lost.
本発明で用いる無機質結合材としては、その組成がSi
O235〜50重量％、B2O39〜20重量％、MgO10〜15重量％、
CaO5〜10重量％で残部がAl2O3であるものを用いる。こ
の組成の無機質結合材は、1200〜1450℃で完全溶融し、
強固で安定なホウケイ酸ガラスを生成し、SiO2が存在し
ても金属溶湯、特にアルミニウム溶湯に対して耐蝕性の
良いものとなる。The inorganic binder used in the present invention has a composition of Si
O 2 35 to 50 wt%, B 2 O 3 9 to 20 wt%, MgO10～15 wt%,
Use is made of CaO 5 to 10% by weight with the balance being Al 2 O 3 . The inorganic binder of this composition completely melts at 1200-1450 ° C,
A strong and stable borosilicate glass is produced, and even if SiO 2 is present, it has good corrosion resistance to a molten metal, particularly an aluminum molten metal.
なお、濾材の形状はチューブ状に限られず板状であっ
てもよい。また、濾材の厚さは通常15〜35mm程度あれば
よい。Note that the shape of the filter medium is not limited to the tube shape, but may be a plate shape. In addition, the thickness of the filter medium may usually be about 15 to 35 mm.
次いで、本発明の濾材の製造方法を説明する。 Next, a method for producing the filter medium of the present invention will be described.
まず、TiO2を2.0重量％以上含有する溶融アルミナ粒
子100重量部に対し、上記した特定組成の無機質結合材
５〜20重量部を配合し、カルボキシルメチルセルロース
（CMC）、リグニンスルホン酸カルシウム、デキストリ
ン等の有機バインダーと適当量の水分を加え、混練した
後、混練物を所定形状に成形する。次いで成形体を乾燥
した後、この成形体を1200〜1450℃の温度にて焼成する
ことにより、本発明の濾材を製造することができる。First, with respect to 100 parts by weight of fused alumina particles containing TiO 2 2.0% by weight or more, blended with inorganic binder 5-20 parts by weight of the specific composition described above, carboxyl methyl cellulose (CMC), calcium ligninsulfonate, dextrin After adding the organic binder and an appropriate amount of water and kneading, the kneaded material is formed into a predetermined shape. Next, after drying the compact, the compact is fired at a temperature of 1200 to 1450 ° C., whereby the filter medium of the present invention can be produced.
本発明の焼成温度としては、無機質結合材の組成との
関係があり、1200〜1450℃にすることが好ましい。1200
℃未満では無機質結合材が不完全溶融となり、1450℃を
超えるとB2O3が飛散するので好ましくない。The firing temperature of the present invention has a relationship with the composition of the inorganic binder, and is preferably set to 1200 to 1450 ° C. 1200
Inorganic binder is incomplete melting below ° C., unfavorably the B 2 O 3 exceeds 1450 ° C. scattering.
［実施例］ 以下、本発明を実施例に基づきさらに詳細に説明する
が、本発明はこれらの実施例に限られるものではない。EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.
（実施例１） 粒度♯24でTiO2含有量を変化させた溶融アルミナ粒子
を骨材とし、それに対して無機質結合材の添加量及び組
成を変化させて添加し、これにカルボキシメチルセルロ
ース（CMC）、デキストリン等の有機バインダー、水を
加えて混練した。得られた混練物を、外径100mmφ、内
径60mmφ、長さ700mmの一端を閉じたパイプ形状に成形
し、次いで乾燥した後、各種の温度で焼成を行い多孔質
の焼成体を得た。この多孔質焼成体について、見掛気孔
率、通気量（14mm水柱）、抗折強度、Si流出量等につい
て測定を行い、更に、浸漬後のサンプルの750℃におけ
る残存強度及び通湯量の測定を行った。これらの結果を
表−１に示す。(Example 1) Fused alumina particles having a particle size of # 24 and a TiO 2 content changed were used as aggregates, and the amount and composition of the inorganic binder were changed and added to the aggregates, and carboxymethyl cellulose (CMC) was added thereto. And an organic binder such as dextrin and water were added and kneaded. The obtained kneaded material was formed into a pipe shape having an outer diameter of 100 mmφ, an inner diameter of 60 mmφ, and a length of 700 mm with one end closed, then dried, and fired at various temperatures to obtain a porous fired body. For this porous fired body, the apparent porosity, air permeability (14 mm water column), bending strength, Si outflow, etc. were measured, and the remaining strength at 750 ° C. of the sample after immersion and the flow of hot water were measured. went. Table 1 shows these results.
なお、見掛気孔率はJISR2205−74の方法に従って求め
た。通気量はマッセンガレ（Massengale）の通気量測定
装置に基いて作製した測定装置を用い差圧14mm水柱にて
測定した。Si流出量は、焼成体1kgをJIS 5056アルミニ
ウム合金10kgの750℃溶湯中に浸漬し、24時間後にサン
プリングして行った。The apparent porosity was determined according to the method of JISR2205-74. The air permeability was measured with a water column having a differential pressure of 14 mm using a measuring device manufactured based on a mass measuring device of Massengale. The Si outflow amount was measured by immersing 1 kg of the fired body in 750 ° C. molten metal of 10 kg of JIS 5056 aluminum alloy and sampling 24 hours later.
また、常温における抗折強度はJIS R2213に準じ、浸
漬後のサンプルの750℃での残存強度は750℃に加熱した
電気炉内で第１図に示すような３点曲げ試験にて測定し
た。通湯量は、750℃に保持したJIS 1050のアルミニウ
ム溶湯を上記で得られた多孔質体に通過させ、単位面積
当りの通湯量を測定した。The flexural strength at room temperature was in accordance with JIS R2213, and the residual strength of the sample after immersion at 750 ° C. was measured in a three-point bending test as shown in FIG. 1 in an electric furnace heated to 750 ° C. The hot water flow rate was determined by passing a JIS 1050 aluminum melt maintained at 750 ° C. through the porous body obtained above and measuring the hot water flow rate per unit area.
表−１の結果より明らかなように、本発明に示す各要
件を満足する多孔質体は、要件を満足しない多孔質体に
比し、金属溶湯用濾材としての各種特性、即ち、通湯
量、Si流出の少なさ、抗折強度及び残存強度などの特性
をバランス良く有していることがわかる。As is clear from the results in Table 1, the porous body satisfying each requirement shown in the present invention has various properties as a filter medium for molten metal, that is, the amount of hot water, It can be seen that characteristics such as low Si outflow, bending strength and residual strength are well-balanced.
［発明の効果］ 以上説明したように、本発明によれば、TiO2を2.0重
量％以上含有する溶融アルミナ粒子を骨材粒子とし、こ
れに特定組成の無機質結合材を所定量配合したので、骨
材と無機質結合材との濡れ性、結合性が高められ、その
結果強度の大なる金属溶湯用濾材を得ることができる。
また、無機質結合材は強固で安定なホウケイ酸ガラスを
生成するため、結合材中にSiO2が存在しても、金属溶
湯、特にアルミニウム溶湯に対する耐蝕性に優れた濾材
を提供できる。 [Effects of the Invention] As described above, according to the present invention, fused alumina particles containing 2.0% by weight or more of TiO 2 were used as aggregate particles, and a predetermined amount of an inorganic binder having a specific composition was added thereto. The wettability and the bondability between the aggregate and the inorganic binder are enhanced, and as a result, a filter medium for molten metal having high strength can be obtained.
Further, since the inorganic binder generates a strong and stable borosilicate glass, even if SiO 2 is present in the binder, it is possible to provide a filter medium having excellent corrosion resistance to molten metal, particularly aluminum molten metal.
第１図は750℃における３点曲げ試験を示す説明図であ
る。FIG. 1 is an explanatory view showing a three-point bending test at 750 ° C.
Claims (2)
結合させた多孔質の濾材であって、 該骨材粒子としてTiO2を2.0重量％以上含有する溶融ア
ルミナ粒子を用いるとともに、その組成がSiO235〜50重
量％、B2O39〜20重量％、MgO10〜15重量％、CaO5〜10重
量％で残部がAl2O3である無機質結合材を用い、かつ該
骨材粒子100重量部に対して該無機質結合材を５〜20重
量部配合してなることを特徴とする金属溶湯用濾材。1. A porous filter medium in which ceramic aggregate particles are bonded by an inorganic binder, wherein fused alumina particles containing 2.0% by weight or more of TiO 2 are used as the aggregate particles, and the composition thereof is SiO. 2 35-50 wt%, B 2 O 3 9 to 20 wt%, MgO10～15 wt%, the balance with inorganic binding material is Al 2 O 3 in CaO5~10 wt%, and bone material particles 100 wt 5 to 20 parts by weight of said inorganic binder per part by weight.
結合させることにより多孔質の金属溶湯用濾材を製造す
るに当り、 TiO2を2.0重量％以上含有する溶融アルミナ粒子を骨材
粒子とし、この骨材粒子100重量部に対し、SiO235〜50
重量％、B2O39〜20重量％、MgO10〜15重量％、CaO5〜10
重量％で残部がAl2O3の組成を有する無機質結合材５〜2
0重量部を配合した後混練し、得られた混練物を成形、
乾燥した後、この成形体を1200〜1450℃の温度にて焼成
することを特徴とする金属溶湯用濾材の製造方法。2. When producing a porous filter medium for molten metal by bonding ceramic aggregate particles with an inorganic binder, fused alumina particles containing 2.0% by weight or more of TiO 2 are used as aggregate particles. SiO 2 35-50 per 100 parts by weight of aggregate particles
Wt%, B 2 O 3 9~20 wt%, MgO10~15 wt%, CaO5~10
Inorganic binder 5-2 having a composition of Al 2 O 3 with the balance being Al 2 O 3 by weight
After mixing 0 parts by weight and kneading, the resulting kneaded product is molded,
After drying, the formed body is fired at a temperature of 1200 to 1450 ° C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2164474A JP2813039B2 (en) | 1990-06-22 | 1990-06-22 | Filter material for molten metal and method for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2164474A JP2813039B2 (en) | 1990-06-22 | 1990-06-22 | Filter material for molten metal and method for producing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0459010A JPH0459010A (en) | 1992-02-25 |
| JP2813039B2 true JP2813039B2 (en) | 1998-10-22 |
Family
ID=15793867
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2164474A Expired - Lifetime JP2813039B2 (en) | 1990-06-22 | 1990-06-22 | Filter material for molten metal and method for producing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2813039B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106673698B (en) * | 2017-02-08 | 2019-04-09 | 无锡工艺职业技术学院 | A kind of ceramic particle adsorbing waste water impurity |
-
1990
- 1990-06-22 JP JP2164474A patent/JP2813039B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0459010A (en) | 1992-02-25 |
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