JPH11285779A - Method for reproducing molding sand - Google Patents

Method for reproducing molding sand

Info

Publication number
JPH11285779A
JPH11285779A JP10561398A JP10561398A JPH11285779A JP H11285779 A JPH11285779 A JP H11285779A JP 10561398 A JP10561398 A JP 10561398A JP 10561398 A JP10561398 A JP 10561398A JP H11285779 A JPH11285779 A JP H11285779A
Authority
JP
Japan
Prior art keywords
molding sand
sand
furnace
air
molding
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.)
Withdrawn
Application number
JP10561398A
Other languages
Japanese (ja)
Inventor
Yukio Asahina
Yasutsugu Matsukawa
Naohisa Tatsumi
幸夫 朝比奈
安次 松川
尚久 辰巳
Original Assignee
Nippon Kokan Pipe Fittings Mfg Co Ltd
Osaka Gas Co Ltd
大阪瓦斯株式会社
日本鋼管継手株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Kokan Pipe Fittings Mfg Co Ltd, Osaka Gas Co Ltd, 大阪瓦斯株式会社, 日本鋼管継手株式会社 filed Critical Nippon Kokan Pipe Fittings Mfg Co Ltd
Priority to JP10561398A priority Critical patent/JPH11285779A/en
Publication of JPH11285779A publication Critical patent/JPH11285779A/en
Withdrawn legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of a lump in a fluidizing layer in the case of being much organic components in a fluidizing type molding sand reproducing method in which used molding sand is roasted while fluidizing it with air. SOLUTION: In this molding sand reproducing method with which used molding sand A is spread from the upper part in a vertical furnace 1 and also, air is injected from many air nozzles 3 provided at the upper end of a grate-like heat exchanging part 5 provided at the lower part in the furnace and the molding sand A fluidized with this air is dropped through the heat exchanging part 2 while burning with the flame of a burner 4 penetratedly provided toward a diagonally lower part on the furnace wall so as to take out it as the reproduced molding sand B from the bottom part of the furnace, from the upper part in the furnace, together with the used molding sand A, 10-50 wt.% mixing ratio of the reproduced molding sand B, are spread, or together with the reproduced molding sand B, or large granular sand or a granular ceramic body instead of the reproduced molding sand B are mixed and spread.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【0001】[0001]
【産業上の利用分野】本発明は、有機成分を含有する使
用済み鋳物砂を焙焼して再生する方法に関するものであ
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for regenerating a used foundry sand containing an organic component by roasting.
【0002】[0002]
【従来の技術】図3は従来のこの種の鋳物砂焙焼方法を
示したもので、竪型炉1内の上部から使用済み鋳物砂A
を散布すると共に、炉内下部に設けた格子状熱交換部2
の上端に多数設けた空気ノズル3から熱交換部2で予熱
された空気を噴出させて、この空気により上記鋳物砂A
を流動化させ、炉壁に斜め下方に向けて貫設したバーナ
4の火炎により、この鋳物砂Aを燃焼させながら上記熱
交換部2を通して落下させ、有機成分の除去された再生
鋳物砂Bを炉の底部から取り出すようにしたものであ
る。この構成によれば、設置面積が小さくて済む竪型炉
を用いて、鋳物砂を流動化することにより、流動層での
滞留時間を長くとることができ、それによって狭い容積
でも十分な時間をかけて焙焼することができる上に、排
熱を回収して熱効率を向上することができるという利点
がある。
2. Description of the Related Art FIG. 3 shows a conventional method for roasting foundry sand of this kind.
And a grid-like heat exchange unit 2 provided in the lower part of the furnace.
The air preheated by the heat exchanging section 2 is jetted from a large number of air nozzles 3 provided at the upper end of the casting sand A.
The casting sand A is dropped through the heat exchange section 2 while burning the casting sand A by the flame of the burner 4 penetrating the furnace wall obliquely downward, and the recycled molding sand B from which organic components have been removed is removed. It was taken out from the bottom of the furnace. According to this configuration, the residence time in the fluidized bed can be increased by fluidizing the molding sand by using a vertical furnace that requires a small installation area, thereby allowing sufficient time even in a small volume. In addition to being able to perform roasting by heating, there is an advantage that heat efficiency can be improved by collecting exhaust heat.
【0003】[0003]
【発明が解決しようとする課題】しかしながら上述の従
来方法では、特にエステル系粘結剤が用いられている場
合に、有機成分として残存するカリウム乃至ナトリウム
酸化物の溶融により砂粒の表面がくっつき合って団塊あ
るいは焼結物が発生し、格子状の熱交換部2が閉塞して
しまって操業が続けられなくなるという問題があった。
本発明はこの問題点を解消し、被処理鋳物砂にエステル
系成分が含まれている場合に、流動層で団塊が発生しな
いような、この種の鋳物砂再生方法を提供することを目
的とするものである。また砂中にエステル系粘結剤を含
まず団塊が発生しない場合にも、可燃成分が過剰になる
と、自燃現象のためにバーナの燃焼量の調節による温度
制御が不安定になるという問題があったが、本発明によ
ればこのような問題も解消することができる。
However, in the above-mentioned conventional method, particularly when an ester binder is used, the surfaces of the sand particles stick together due to melting of potassium or sodium oxide remaining as an organic component. There was a problem that nodules or sinters were generated and the grid-like heat exchange section 2 was closed, so that the operation could not be continued.
It is an object of the present invention to solve this problem and to provide a casting sand regenerating method of this kind that does not generate lumps in a fluidized bed when the casting sand to be treated contains an ester-based component. Is what you do. In addition, even when the sand does not contain an ester binder and no lumps are generated, if the combustible components become excessive, there is a problem that the temperature control by adjusting the burner combustion amount becomes unstable due to the self-combustion phenomenon. However, according to the present invention, such a problem can be solved.
【0004】[0004]
【課題を解決するための手段】本発明による鋳物砂再生
方法は、図1〜2に示すように、竪型炉1内の上部から
使用済み鋳物砂Aを散布すると共に、炉内下部に設けた
格子状熱交換部2の上端に多数設けた空気ノズル3から
空気を噴出させて、この空気により流動化した上記鋳物
砂Aを、炉壁に斜め下方に向けて貫設したバーナ4の火
炎により燃焼させながら、上記熱交換部2を通して落下
させ、炉の底部から再生鋳物砂Bとして取り出すように
した鋳物砂再生方法において、炉内上部から使用済み鋳
物砂Aと共に、混合割合10%乃至50%の再生鋳物砂
Bを散布するようにし、あるいは再生鋳物砂Bと共に、
又は再生鋳物砂Bに代えて大粒砂又は粒状セラミック体
を混入散布するようにしたものであって、表面に粘着性
の有機物が付着した使用済み鋳物砂Aに、再生した砂や
セラミック体を混入することにより、相互の粘着力を弱
めて塊の発生を防止すると共に、鋳物砂投入量の一部を
再生砂に代えることにより自燃成分の含有比率を引き下
げて、温度制御の不安定化を防止した点に特徴を有する
ものである。
As shown in FIGS. 1 and 2, a method for reclaiming foundry sand according to the present invention is to disperse used foundry sand A from an upper part in a vertical furnace 1 and to provide a used sand in a lower part in the furnace. Air is ejected from a large number of air nozzles 3 provided at the upper end of the lattice-shaped heat exchange section 2, and the molding sand A fluidized by the air is burned into a furnace wall by a burner 4 obliquely directed downward. In the molding sand recycling method in which the molding sand is dropped through the heat exchanging section 2 and removed from the bottom of the furnace as regenerated molding sand B, the mixing ratio of the used molding sand A from the upper part of the furnace is 10% to 50%. % Of the foundry sand B, or together with the foundry sand B,
Alternatively, large sand or a granular ceramic body is mixed and dispersed in place of the recycled molding sand B, and the recycled sand or ceramic body is mixed with the used molding sand A having a sticky organic substance adhered to the surface. To prevent the formation of lumps by weakening the mutual adhesive force and reduce the content ratio of self-combustion components by replacing part of the casting sand charge with recycled sand to prevent instability in temperature control. It is characterized by the following points.
【0005】[0005]
【発明の実施形態】図1〜2は本発明を実施する装置の
一例を示したもので、竪型炉1内の上部から、使用済み
鋳物砂Aと再生された鋳物砂Bとが、笠状の分散板5の
上に投入されて、互いに混ざり合いながら下方の流動層
まで落下し、ここで炉壁に貫設されているバーナ4の火
炎により焙焼される。なお鋳物砂AとBを投入前に前も
って混合しておいてもよい。流動層では、炉内下部に設
けられた格子状熱交換部2の上端の空気ノズル孔4から
空気が噴出し、上昇する空気と下降する鋳物砂A,Bと
が混ざり合って流動化し、この流動層の中では鋳物砂A
と空気との接触面積はきわめて大きく、また鋳物砂の滞
留時間が長いので、有機物を十分時間をかけて焙焼する
ことができる。こうして流動層を通過した鋳物砂は、更
に熱交換部2を通って空気を予熱しながら落下するが、
炉の底部に達するまでには可燃成分が完全に燃焼し尽く
した再生鋳物砂として炉外へ取り出される。
1 and 2 show an example of an apparatus for carrying out the present invention. From the upper part of a vertical furnace 1, used molding sand A and regenerated molding sand B are shaded. The mixture is dropped on the dispersion plate 5 and dropped to the lower fluidized bed while being mixed with each other, where it is roasted by the flame of the burner 4 penetrating the furnace wall. The casting sands A and B may be mixed in advance before being charged. In the fluidized bed, air is blown out from the air nozzle holes 4 at the upper end of the lattice heat exchange section 2 provided in the lower part of the furnace, and the rising air and the descending molding sands A and B are mixed and fluidized. Foundry sand A in the fluidized bed
Since the contact area between the material and the air is extremely large and the residence time of the molding sand is long, the organic matter can be roasted for a sufficient time. The foundry sand that has passed through the fluidized bed falls through the heat exchange section 2 while preheating the air.
Before reaching the bottom of the furnace, combustible components are taken out of the furnace as regenerated foundry sand that has been completely burned out.
【0006】再生鋳物砂の混入量は、使用済み鋳物砂へ
の混合割合10〜50重量%程度が適当であるが、特に
エステル系の粘結剤を使用して団塊が発生し易い場合に
は、再生鋳物砂の代わりに大粒の砂又は粒状セラミック
体(粒径2〜3mm程度)を使用することにより、団塊
防止の効果を一層高めることもできる。また再生鋳物砂
とセラミック粒とを混合して使用してもよく、その場合
には、炉外へ取り出した後に再生鋳物砂をふるい分け
し、セラミック粒は再循環させて使用することになる。
一方、エステル系粘結剤を含まず団塊が発生しない場合
にも、可燃成分が多い場合には温度制御が不安定になっ
て操業が困難になるが、そのような場合にも同様な方法
で対応できる。但しこの場合には再生鋳物砂の混入割合
は、10〜30%程度でよい。
The mixing amount of the recycled molding sand is preferably about 10 to 50% by weight in the used molding sand, especially when an ester-based binder is used to easily form nodules. By using large-sized sand or a granular ceramic body (having a particle size of about 2 to 3 mm) instead of the reclaimed molding sand, the effect of preventing lumps can be further enhanced. Regenerated molding sand and ceramic particles may be mixed and used. In this case, after being taken out of the furnace, the recycled molding sand is sieved, and the ceramic particles are recycled and used.
On the other hand, even when no lumps are generated without an ester binder, if there is a large amount of combustible components, temperature control becomes unstable and operation becomes difficult, but in such a case, a similar method is used. Can respond. However, in this case, the mixing ratio of the recycled molding sand may be about 10 to 30%.
【0007】[0007]
【発明の効果】本発明によれば上述のように、設置面積
が小さく処理能力がきわめて大きい流動砂方式の鋳物砂
再生方法において、その欠点である流動層での団塊の発
生及び自燃による温度制御の不安定化を、被処理鋳物砂
に再生済み鋳物砂あるいは大粒砂を混入するというきわ
めて簡単な手段で解決し得るという利点がある。なお有
機成分の比率が低い場合には、混入砂の供給を停止し
て、従来通りの方法で処理すればよいことは言うまでも
ない。
According to the present invention, as described above, in the method for reclaiming molding sand of the fluidized sand type having a small installation area and extremely large processing capacity, the disadvantages are the generation of aggregates in the fluidized bed and temperature control by self-combustion. The advantage of the present invention is that the instability can be solved by a very simple means of mixing recycled molding sand or large-grained sand into the molding sand to be treated. When the ratio of the organic component is low, it goes without saying that the supply of the mixed sand may be stopped and the treatment may be performed by a conventional method.
【図面の簡単な説明】[Brief description of the drawings]
【図1】本発明の一実施例の縦断面図。FIG. 1 is a longitudinal sectional view of one embodiment of the present invention.
【図2】同上の要部斜視図。FIG. 2 is a perspective view of a main part of the above.
【図3】従来例の縦断面図。FIG. 3 is a longitudinal sectional view of a conventional example.
【符号の説明】[Explanation of symbols]
1 竪型炉 2 格子状熱交換部 3 空気ノズル 4 バーナ 5 分散板 A 使用済み鋳物砂 B 再生鋳物砂 DESCRIPTION OF SYMBOLS 1 Vertical furnace 2 Grid heat exchange part 3 Air nozzle 4 Burner 5 Dispersion plate A Spent molding sand B Recycled molding sand
【手続補正書】[Procedure amendment]
【提出日】平成10年7月24日[Submission date] July 24, 1998
【手続補正1】[Procedure amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】図面の簡単な説明[Correction target item name] Brief description of drawings
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【図面の簡単な説明】[Brief description of the drawings]
【図1】本発明の一実施例の縦断面図。FIG. 1 is a longitudinal sectional view of one embodiment of the present invention.
【図2】図1におけるX−X部の断面図。FIG. 2 is a sectional view taken along the line XX in FIG.
【図3】図1の要部の拡大断面図。FIG. 3 is an enlarged sectional view of a main part of FIG. 1;
【図4】従来例の縦断面図。FIG. 4 is a longitudinal sectional view of a conventional example.
【符号の説明】 1 竪型炉 2 格子状熱交換部 3 空気ノズル 4 バーナ 5 分散板 A 使用済み鋳物砂 B 再生鋳物砂[Description of Signs] 1 Vertical furnace 2 Grid heat exchange part 3 Air nozzle 4 Burner 5 Dispersion plate A Spent molding sand B Reclaimed molding sand
───────────────────────────────────────────────────── フロントページの続き (72)発明者 松川 安次 大阪府岸和田市田治米町153番地の1 日 本鋼管継手株式会社内 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yasuji Matsukawa 1 at 153 Taji Yonemachi, Kishiwada-shi, Osaka, Japan

Claims (2)

    【特許請求の範囲】[Claims]
  1. 【請求項1】 竪型炉内の上部から使用済み鋳物砂を散
    布すると共に、炉内下部に設けた格子状熱交換部の上端
    に多数設けた空気ノズル孔から空気を噴出させて、この
    空気により流動化した上記鋳物砂を、炉壁に斜め下方に
    向けて貫設したバーナの火炎により燃焼させながら、上
    記熱交換部を通して落下させ、炉の底部から再生鋳物砂
    として取り出すようにした鋳物砂再生方法において、炉
    内上部から使用済み鋳物砂と共に、混合割合10〜50
    %(重量)の再生された鋳物砂を散布するようにしたこ
    とを特徴とする鋳物砂再生焼方法。
    1. Spraying used casting sand from the upper part of a vertical furnace, and blowing air from a large number of air nozzle holes provided at the upper end of a grid-like heat exchange part provided at the lower part of the furnace to produce air. The molding sand, which has been fluidized by the above, is dropped through the heat exchanging section while being burned by the flame of a burner penetrating the furnace wall obliquely downward, and is taken out from the bottom of the furnace as recycled molding sand. In the regeneration method, the mixing ratio is 10 to 50 together with the used foundry sand from the upper part of the furnace.
    % (Weight) of the foundry sand, which is sprayed.
  2. 【請求項2】 上記再生鋳物砂と共に、又は再生鋳物砂
    に代えて、大粒砂又は粒状セラミック体を上記使用済み
    鋳物砂に混入散布するようにしたことを特徴とする請求
    項1記載の鋳物砂再生方法。
    2. The molding sand according to claim 1, wherein large sand or a granular ceramic body is mixed and dispersed in said used molding sand together with or instead of said recycled molding sand. Playback method.
JP10561398A 1998-03-31 1998-03-31 Method for reproducing molding sand Withdrawn JPH11285779A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10561398A JPH11285779A (en) 1998-03-31 1998-03-31 Method for reproducing molding sand

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10561398A JPH11285779A (en) 1998-03-31 1998-03-31 Method for reproducing molding sand

Publications (1)

Publication Number Publication Date
JPH11285779A true JPH11285779A (en) 1999-10-19

Family

ID=14412360

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10561398A Withdrawn JPH11285779A (en) 1998-03-31 1998-03-31 Method for reproducing molding sand

Country Status (1)

Country Link
JP (1) JPH11285779A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005070586A1 (en) * 2004-01-07 2005-08-04 Xudong Zhu Heating apparatus for foundry sand
WO2006019047A1 (en) * 2004-08-20 2006-02-23 Asahi Organic Chemicals Industry Co., Ltd. Method and apparatus for producing regenerated foundry sand
JP2009208081A (en) * 2008-02-29 2009-09-17 Matsui Kogyo:Kk Regeneration apparatus for casting sand
CN101862809A (en) * 2010-06-02 2010-10-20 无锡锡南铸造机械有限公司 Continuous rubbing sand reclamation machine
KR101362442B1 (en) * 2011-12-20 2014-02-14 주식회사 인텍 Method for preparing ladle filler and device used therein
CN105458164A (en) * 2016-01-08 2016-04-06 山东金璞新材料有限公司 Energy-saving stuffing cooling type casting sand rapid roasting regeneration system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005070586A1 (en) * 2004-01-07 2005-08-04 Xudong Zhu Heating apparatus for foundry sand
US7241139B2 (en) 2004-01-07 2007-07-10 XuDong Zhu Casting sand heating apparatus
WO2006019047A1 (en) * 2004-08-20 2006-02-23 Asahi Organic Chemicals Industry Co., Ltd. Method and apparatus for producing regenerated foundry sand
JP2009208081A (en) * 2008-02-29 2009-09-17 Matsui Kogyo:Kk Regeneration apparatus for casting sand
CN101862809A (en) * 2010-06-02 2010-10-20 无锡锡南铸造机械有限公司 Continuous rubbing sand reclamation machine
KR101362442B1 (en) * 2011-12-20 2014-02-14 주식회사 인텍 Method for preparing ladle filler and device used therein
CN105458164A (en) * 2016-01-08 2016-04-06 山东金璞新材料有限公司 Energy-saving stuffing cooling type casting sand rapid roasting regeneration system

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