JPH10323736A - Production of artificial sand for foundry sand mold - Google Patents
Production of artificial sand for foundry sand moldInfo
- Publication number
- JPH10323736A JPH10323736A JP9154434A JP15443497A JPH10323736A JP H10323736 A JPH10323736 A JP H10323736A JP 9154434 A JP9154434 A JP 9154434A JP 15443497 A JP15443497 A JP 15443497A JP H10323736 A JPH10323736 A JP H10323736A
- Authority
- JP
- Japan
- Prior art keywords
- sand
- artificial
- mold
- weight
- fine powder
- 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
Links
Classifications
-
- 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
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
Landscapes
- Mold Materials And Core Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、鋳物の製造に関し
て回収される微粉砂を鋳物砂型用に再使用できる人工砂
の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing artificial sand in which fine sand collected in the production of castings can be reused for molding sand molds.
【０００２】[0002]
【従来の技術】近年、環境問題に対する関心が高まり、
我国においても産業界、学界、官界挙げてその対策に取
り組んでいる。具体的には、廃棄物処理・リサイクルな
どに関する立法措置が講じられ、それに応じて企業にお
いても環境保全と経済性の確保との調和を図るための革
新的な技術開発が行われている。2. Description of the Related Art In recent years, interest in environmental issues has increased,
In Japan as well, the industry, academia and government are working on countermeasures. Specifically, legislative measures regarding waste disposal and recycling have been taken, and in response, companies have been developing innovative technologies to achieve harmony between environmental protection and economic efficiency.
【０００３】鋳物業界においても、鋳物の製造に関し
て、使用済み鋳物砂型を開枠した砂などが多量に発生す
る。これらの砂は再生処理して、約半分を再生鋳物砂と
してリサイクルしている。[0003] In the casting industry as well, in the production of castings, a large amount of sand or the like obtained by opening a used casting sand mold is generated. These sands are recycled and about half are recycled as recycled foundry sand.
【０００４】残りの約半分は有機物などを含んだ集塵ダ
スト（微粉砂）である。この集塵ダスト（微粉砂）を鋳
物砂として使用した場合には、砂型内に溶湯を注入する
と、その中に含まれている有機物が燃焼して多量のガス
が発生し、また、集塵ダスト（微粉砂）を使用して砂型
を製造するには多量の水を必要とするので砂型に含まれ
る多量の水が一挙に水蒸気などになる。微粉砂を使用し
た砂型には、これらの多量のガスや水蒸気などを通す空
隙が極めて僅かしか存在しないので、鋳造品にガス欠陥
が多発し、このような集塵ダスト（微粉砂）は再生鋳物
砂としてリサイクル使用することができない。そのた
め、集塵ダスト（微粉砂）は埋め立て処理などにより処
分されていた。The remaining half is dust dust (fine sand) containing organic matter and the like. When this dust dust (fine sand) is used as foundry sand, when the molten metal is poured into the sand mold, the organic matter contained therein will burn and generate a large amount of gas. Since a large amount of water is required to produce a sand mold using (fine sand), the large amount of water contained in the sand mold becomes steam at a stroke. Since a sand mold using fine sand has very few voids for passing such a large amount of gas and water vapor, gas defects frequently occur in the cast product, and such dust collected (fine sand) is recycled casting. Cannot be recycled as sand. For this reason, dust collected (fine sand) has been disposed of by landfill.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、鋳物の
製造に関して生ずる再利用できないこのような集塵ダス
ト（微粉砂）を埋め立て処理などするためにはかなりの
費用を要するだけでなく、埋め立て場所にも限界があ
る。However, landfilling of such non-reusable collected dust (fine sand) generated in the production of castings requires not only a considerable expense but also a landfill site. There is a limit.
【０００６】本発明は、鋳物の製造に関して廃棄物とし
て大量に回収される微粉砂を使用して、鋳物砂型に再使
用できる物性を備えた人工砂の製造方法を提供すること
を目的とする。It is an object of the present invention to provide a method for producing artificial sand having physical properties that can be reused in a molding sand mold by using fine sand collected in large quantities as waste in the production of castings.
【０００７】[0007]
【課題を解決するための手段】前記目的を達成するため
に、本発明は、鋳物の製造に関して回収される微粉砂を
撹拌しながら水を加えて造粒し、次いで８００〜１００
０℃で焼成すること、を特徴とする８０重量％以上が２
０〜２００メッシュの鋳物砂型用人工砂の製造方法であ
る。In order to achieve the above-mentioned object, the present invention relates to a method for producing a casting, in which fine sand collected from a casting is granulated by adding water with stirring, and then 800 to 100%.
Baking at 0 ° C .;
This is a method for producing an artificial sand for a casting sand mold of 0 to 200 mesh.
【０００８】また本発明は、微粉砂を高速撹拌しなが
ら、これに対して水を２０〜３０重量％の範囲で噴霧し
て加える、前記の８０重量％以上が２０〜２００メッシ
ュの鋳物砂型用人工砂の製造方法である。[0008] The present invention also relates to a casting sand mold of 80 to 80% by weight, wherein water is sprayed in a range of 20 to 30% by weight while fine powder sand is stirred at a high speed. This is a method for producing artificial sand.
【０００９】[0009]
【発明の実施の形態】本発明の鋳物砂型用人工砂の製造
に使用される微粉砂は、使用済み鋳物砂型の開枠の際に
発生する集塵ダストや、その開枠の際にオーバーフロー
した生型砂を乾燥して砂粒子同士を生型砂再生装置で摩
擦摩耗させ砂粒子表面の付着物を剥離させた微粉砂等
の、鋳物の製造に関する諸工程から回収される微細な砂
であって、鋳物砂として再使用できないほど微細な砂で
ある。一般に鋳物砂型には、硅砂、粘土、澱粉、炭素な
どから形成される生砂型と、硅砂、有機バインダー樹脂
から形成される有機砂型がある。鋳物の製造に関する諸
工程や鋳物砂の再生工程などから回収される２００メッ
シュより微細な砂を３０重量％以上、好ましくは５０重
量％以上含有する微粉砂が、本発明における鋳物砂型用
人工砂の原料として使用される。この微粉砂には、生砂
型のみから得られるものの他に、これと少量の有機砂型
から得られるものとの混合物を含み、鉱物成分として、
ＳｉＯ2 ７５．０〜８５．０重量％、Ａｌ2 Ｏ3 ６．０
〜１３．０重量％、Ｆｅ2 Ｏ3 １．０〜３．０重量％、
Ｎａ2 Ｏ１．０〜２．５重量％、Ｋ2 Ｏ０．５〜１．０
重量％、ＣａＯ１．０〜２．０重量％、ＭｇＯ１．０〜
３．０重量％、ＴｉＯ2 ０．１〜０．３重量％を含み、
また、その他の成分として、有機バインダー樹脂、澱
粉、炭素などを鉱物成分の合計１００重量部に対し合計
で２．４〜３．６重量部含有している。ＳｉＯ2 以外の
鉱物成分は焼成すると一部溶融し、またその他の成分は
一部燃焼して人工砂を形成する。BEST MODE FOR CARRYING OUT THE INVENTION Fine powder sand used in the production of the artificial sand for a molding sand mold of the present invention is dust collected when the used molding sand mold is opened, and overflows when the used molding sand mold is opened. Fine sand collected from various processes related to the production of castings, such as fine powder sand obtained by drying the green sand and frictionally abrading the sand particles with each other with a green sand reclaiming device to remove the deposits on the surface of the sand particles, The sand is so fine that it cannot be reused as foundry sand. Generally, there are two types of casting sand molds: a green sand mold formed of silica sand, clay, starch, carbon, and the like, and an organic sand mold formed of silica sand and an organic binder resin. The fine sand containing 30% by weight or more, preferably 50% by weight or more, of fine sand of 200 mesh or more recovered from various steps relating to the production of castings and the regeneration step of foundry sand, etc. Used as raw material. This fine sand contains, in addition to those obtained only from the raw sand type, a mixture of this and a small amount obtained from the organic sand type, and as a mineral component,
75.0 to 85.0% by weight of SiO 2, 6.0 of Al 2 O 3
１３13.0% by weight, Fe 2 O 3 1.0-3.0% by weight,
Na 2 O1.0~2.5 wt%, K 2 O0.5~1.0
Wt%, CaO 1.0 to 2.0 wt%, MgO 1.0 to
3.0 wt%, wherein the TiO 2 0.1 to 0.3 wt%,
Further, as other components, an organic binder resin, starch, carbon, and the like are contained in a total of 2.4 to 3.6 parts by weight based on a total of 100 parts by weight of the mineral components. Mineral components other than SiO 2 are partially melted when fired, and other components are partially burned to form artificial sand.
【００１０】本発明の鋳物砂型用人工砂の製造におい
て、まず、前記微粉砂は好適には１０００ｒｐｍ以上、
更に好適には３０００〜１００００ｒｐｍの高速で撹拌
しながら水を加えて、好ましくは、その８０重量％以上
さらに８０〜９０重量％が２０〜２００メッシュさらに
７０〜１００メッシュに造粒する。この粒度に均一に造
粒するためには、水は噴霧状で加えるのが最も好まし
い。水は微粉砂に対して２０〜３０重量％の範囲で添加
するのが好ましい。次に、造粒物（砂粒）は、場合によ
って自然乾燥あるいは熱などにより強制乾燥した後、電
気炉、重油炉などで８００〜１０００℃、好ましくは９
００〜９５０℃で所定時間（例えば５０〜７０分間）焼
成する。このようにして得られる焼結粒は、その８０重
量％以上さらに好ましくは８０〜９０重量％が２０〜２
００メッシュさらに好ましくは７０〜１００メッシュの
砂である。In the production of the artificial sand for a foundry sand mold of the present invention, first, the fine powder sand is preferably at least 1000 rpm,
More preferably, water is added while stirring at a high speed of 3000-10000 rpm, and preferably 80% by weight or more and further 80-90% by weight are granulated to 20-200 mesh and further 70-100 mesh. Most preferably, water is added in the form of a spray in order to uniformly granulate to this particle size. Water is preferably added in the range of 20 to 30% by weight based on the fine sand. Next, the granulated material (sand particles) may be naturally dried or forcibly dried by heat or the like, if necessary, in an electric furnace, a heavy oil furnace or the like at 800 to 1000 ° C., preferably 9 to 1000 ° C.
Firing at 00 to 950 ° C. for a predetermined time (for example, 50 to 70 minutes). The sintered particles obtained in this manner are preferably 80% by weight or more, more preferably 80 to 90% by weight, 20 to 2% by weight.
00 mesh, more preferably 70-100 mesh sand.
【００１１】[0011]
【実施例】以下、実施例により本発明を更に詳細に説明
する。なお実施例及び比較例において、熱膨張率の場合
を除いて「％」は「重量％」を意味する。実施例１ 不二パウダル（株）製の試験用造粒機スパルダン・リュ
ーザーＲＭＯ−２Ｈ型を使用して、有機バインダー樹脂
及び粘土分等を含有する生型鋳造ライン及び生型砂再生
装置から回収される２００メッシュより細かい砂を６
２．５６％含有する微粉砂（集塵ダスト）２０００ｇを
３１００〜６２００ｒｐｍで高速撹拌しながら、これに
水を４００ｍｌ／ｍｉｎで微粉砂に対し約２５％の割合
で噴霧して加えて、造粒した。この造粒物を３０ｋｗ／
ｈｒの熱処理炉中で９００℃にて７０分間焼成して、人
工砂を製造した。得られた人工砂の特性を以下に示す。 （１）化学組成：ＳｉＯ2 ７５．５％、Ａｌ2 Ｏ3 １
２．７％、Ｆｅ2 Ｏ3 ２．８９％、ＴｉＯ2 ０．１５
％、Ｎａ2 Ｏ２．１１％、Ｋ2 Ｏ０．６６％、ＣａＯ
１．４８％、ＭｇＯ２．８６％、その他１．６５％ （２）耐破砕性 得られた人工砂を５０メッシュ、７０メッシュ、１００
メッシュ、及び１４０メッシュに分級し、これらそれぞ
れについて十分に水洗し乾燥して、日本鋳造工学会東海
支部、無機砂型研究部会試験方法（ＴＩＫＳ−３０６）
に準じて破砕試験を行った。破砕試験の前後の（分級し
た）人工砂の粒度分布の測定結果をまとめて表１に示
す。なお、製造した（分級前の）人工砂の粒度分布の測
定結果を併せて表１に示す。 （３）抗折力及び熱膨張性 得られた人工砂（分級前）に対してノボラック型フェノ
ール樹脂を２．５％（固形分換算）の割合で加えて２３
０℃で５０秒間撹拌し、次いでヘキサミンを１５％の割
合で加えて５秒間撹拌し、更に３０秒間送風して冷却
し、この中にステアリン酸カルシウムを０．１％の割合
で加えて３０秒間撹拌した。得られた樹脂被覆人工砂を
型の中に充填し、２００℃で６０秒間加熱し冷却して、
１０ｍｍ×１０ｍｍ×６０ｍｍのシェルモールド鋳型試
験片を得た。この試験片について、ＪＩＳ Ｚ２６０４
の方法に準じて抗折力（強度）を測定した。また、鋳物
砂熱膨張計により１０００℃における熱膨張率を測定し
た。これらの測定結果と製造した人工砂の嵩比重の測定
結果をまとめて表２に示す。The present invention will be described in more detail with reference to the following examples. In Examples and Comparative Examples, “%” means “% by weight” except for the case of the coefficient of thermal expansion. Example 1 Using a test granulator Spardan-Luzer RMO-2H manufactured by Fuji Paudal Co., Ltd., it was recovered from a green casting line and a green sand recycling apparatus containing an organic binder resin and a clay component. 6 finer sand than 200 mesh
Water is sprayed at a rate of about 25% with respect to the fine sand at a rate of 400 ml / min while 2,000 g of fine sand (dust dust) containing 2.56% is stirred at a high speed of 3100 to 6200 rpm and granulated. did. 30 kw /
It was baked at 900 ° C. for 70 minutes in a heat treatment furnace of hr to produce artificial sand. The properties of the obtained artificial sand are shown below. (1) Chemical composition: 75.5% of SiO 2 , Al 2 O 3 1
2.7%, Fe 2 O 3 2.89%, TiO 2 0.15
%, Na 2 O 2.11%, K 2 O 0.66%, CaO
1.48%, MgO 2.86%, others 1.65% (2) Crush resistance The obtained artificial sand is 50 mesh, 70 mesh, 100 mesh
Classified into a mesh and a 140 mesh, thoroughly washed and dried with respect to each of them, and tested by the Japan Casting Engineering Society Tokai Branch, Inorganic Sand Mold Research Group Test Method (TIKS-306)
A crushing test was performed according to. Table 1 summarizes the measurement results of the particle size distribution of the (sorted) artificial sand before and after the crushing test. Table 1 also shows the measurement results of the particle size distribution of the manufactured artificial sand (before classification). (3) Flexural Strength and Thermal Expansion Novolak-type phenol resin was added to the obtained artificial sand (before classification) at a rate of 2.5% (solid content conversion) to obtain
Stir at 0 ° C. for 50 seconds, then add hexamine at a rate of 15% and stir for 5 seconds, then blow and cool for another 30 seconds, add calcium stearate at a rate of 0.1% and stir for 30 seconds did. The obtained resin-coated artificial sand is filled in a mold, heated at 200 ° C. for 60 seconds and cooled,
A 10 mm × 10 mm × 60 mm shell mold mold test piece was obtained. About this test piece, JIS Z2604
The bending force (strength) was measured according to the method described in (1). Further, the coefficient of thermal expansion at 1000 ° C. was measured by a casting sand thermal dilatometer. Table 2 summarizes these measurement results and the measurement results of the bulk specific gravity of the manufactured artificial sand.
【００１２】比較例１ 実施例１における混合微粉砂（集塵ダスト）の粒度分布
の測定結果を表１に示し、嵩比重の測定結果を表２に示
す。 Comparative Example 1 Table 1 shows the measurement results of the particle size distribution of mixed fine sand (dust dust) in Example 1, and Table 2 shows the measurement results of the bulk specific gravity.
【００１３】比較例２ 鋳物用砂（国産天然珪砂）を使用して、実施例１と同様
の方法で、破砕試験を行なった。鋳物用砂（国産天然珪
砂）と破砕試験の前後の（５０メッシュ、７０メッシ
ュ、１００メッシュに分級した）鋳物用砂の粒度分布の
測定結果をまとめて表１に示す。また、この鋳物用砂
（国産天然珪砂）を使用して、実施例１と同様に、シェ
ルモールド鋳型試験片を作製し、抗折力（強度）及び熱
膨張率を測定した。これらの測定結果とこの鋳物用砂の
嵩比重の測定結果をまとめて表２に示す。COMPARATIVE EXAMPLE 2 A crushing test was conducted in the same manner as in Example 1 using casting sand (domestic natural silica sand). Table 1 summarizes the measurement results of the particle size distribution of the casting sand (domestic natural silica sand) and the casting sand before and after the crushing test (classified into 50 mesh, 70 mesh, and 100 mesh). Using this casting sand (domestic natural silica sand), a shell mold mold test piece was prepared in the same manner as in Example 1, and the bending strength (strength) and the coefficient of thermal expansion were measured. Table 2 summarizes the measurement results and the measurement results of the bulk specific gravity of the foundry sand.
【００１４】[0014]
【表１】 表１の結果より、実施例１で得られた人工砂の粒度分布
及び耐破砕性は、通常の鋳物砂と較べて大差なく、実用
の範囲内である。[Table 1] From the results shown in Table 1, the particle size distribution and the crush resistance of the artificial sand obtained in Example 1 are within a practical range without much difference as compared with ordinary molding sand.
【００１５】[0015]
【表２】 表２の結果より、実施例１で得られた人工砂は、比較例
２の鋳物砂を使用した場合に較べて抗折力はわずかに低
いが、比較例２の鋳物砂を使用した場合と異なり、熱膨
張率は極めて低く砂型に亀裂が入らないので非常に好ま
しい。[Table 2] From the results in Table 2, the artificial sand obtained in Example 1 has a slightly lower transverse rupture strength than the case where the molding sand of Comparative Example 2 was used. On the other hand, the coefficient of thermal expansion is very low and the sand mold is not cracked.
【００１６】[0016]
【発明の効果】以上説明した通り、本発明の工業的で簡
易な方法で得られる人工砂は、粒度分布や、耐破砕性、
抗折力などの物性の点でも鋳物砂型に使用される砂とほ
ぼ同等であり、鋳物砂型に再利用することができる。そ
のため、鋳物の製造に関して回収される使用済み鋳物微
粉砂（集塵ダスト）の埋め立て場所やその処理コストを
大幅に減らすことができ、環境保全や資源の有効利用に
貢献することが可能となった。特に、本発明の方法によ
り得られる人工砂は、通常の鋳物砂と異なり、熱膨張が
少ないかあるいは逆に少し熱収縮するため、鋳型に亀裂
が生ずることがなく強度が低下しない。更に、本発明の
方法により得られる人工砂は、水質の浄化やゴルフ場な
どの土壌の改良等の分野にも幅広く使用することができ
る。As described above, the artificial sand obtained by the industrial and simple method of the present invention has a particle size distribution, crush resistance,
In terms of physical properties such as bending strength, it is almost the same as sand used for foundry sand molds, and can be reused for foundry sand molds. As a result, landfill sites for used casting fine sand (dust dust) collected in the production of castings and their disposal costs can be significantly reduced, which contributes to environmental conservation and effective use of resources. . In particular, the artificial sand obtained by the method of the present invention, unlike ordinary foundry sand, has little thermal expansion or conversely slightly shrinks, so that no crack is generated in the mold and the strength does not decrease. Further, the artificial sand obtained by the method of the present invention can be widely used in fields such as purification of water quality and improvement of soil such as golf courses.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 武之内 教男 茨城県土浦市北神立町４番２ 自動車鋳物 株式会社土浦工場内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Norio Takenouchi 4-2 Kita-Kandate-cho, Tsuchiura-city, Ibaraki Pref.
Claims (2)
撹拌しながら水を加えて造粒し、次いで８００〜１００
０℃で焼成すること、を特徴とする８０重量％以上が２
０〜２００メッシュの鋳物砂型用人工砂の製造方法。1. The fine sand collected for the production of castings is granulated by adding water with stirring and then 800 to 100
Baking at 0 ° C .;
A method for producing an artificial sand for a casting sand mold having 0 to 200 mesh.
これに対して２０〜３０重量％の範囲で噴霧して加え
る、請求項１に記載の８０重量％以上が２０〜２００メ
ッシュの鋳物砂型用人工砂の製造方法。2. The water, while stirring fine sand at a high speed,
The method for producing artificial sand for a molding sand mold of 80% by weight or more according to claim 1, wherein the amount is added by spraying in a range of 20 to 30% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9154434A JPH10323736A (en) | 1997-05-28 | 1997-05-28 | Production of artificial sand for foundry sand mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9154434A JPH10323736A (en) | 1997-05-28 | 1997-05-28 | Production of artificial sand for foundry sand mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10323736A true JPH10323736A (en) | 1998-12-08 |
Family
ID=15584114
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9154434A Pending JPH10323736A (en) | 1997-05-28 | 1997-05-28 | Production of artificial sand for foundry sand mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10323736A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104445216A (en) * | 2014-11-14 | 2015-03-25 | 襄阳市立强机械有限公司 | Processing method of quartz sand of replaceable surface-layer shell-making zirconium sand |
| CN114101577A (en) * | 2021-11-24 | 2022-03-01 | 北京仁创砂业铸造材料有限公司 | Regeneration method of casting 3D printing waste sand |
| CN114273604A (en) * | 2021-11-15 | 2022-04-05 | 天阳新材料科技有限公司 | Recycling method of precoated sand dust |
-
1997
- 1997-05-28 JP JP9154434A patent/JPH10323736A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104445216A (en) * | 2014-11-14 | 2015-03-25 | 襄阳市立强机械有限公司 | Processing method of quartz sand of replaceable surface-layer shell-making zirconium sand |
| CN114273604A (en) * | 2021-11-15 | 2022-04-05 | 天阳新材料科技有限公司 | Recycling method of precoated sand dust |
| CN114273604B (en) * | 2021-11-15 | 2023-08-29 | 天阳新材料科技有限公司 | Method for recycling precoated sand dust |
| CN114101577A (en) * | 2021-11-24 | 2022-03-01 | 北京仁创砂业铸造材料有限公司 | Regeneration method of casting 3D printing waste sand |
| CN114101577B (en) * | 2021-11-24 | 2023-12-29 | 北京仁创砂业铸造材料有限公司 | Regeneration method of casting 3D printing waste sand |
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