CH86882A - Process for the production of mold powder from coal. - Google Patents

Process for the production of mold powder from coal.

Info

Publication number
CH86882A
CH86882A CH86882DA CH86882A CH 86882 A CH86882 A CH 86882A CH 86882D A CH86882D A CH 86882DA CH 86882 A CH86882 A CH 86882A
Authority
CH
Switzerland
Prior art keywords
coal
mold powder
production
heating
bitumen
Prior art date
Application number
Other languages
German (de)
Inventor
Koerting Alfons
Original Assignee
Koerting Alfons
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 Koerting Alfons filed Critical Koerting Alfons
Publication of CH86882A publication Critical patent/CH86882A/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
    • B22C1/14—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives for separating the pattern from the mould

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Description

  

  Verfahren zur Herstellung von     Formenpulver    aus     Kohle.       Gegenstand der vorliegenden Erfindung ist  ein Verfahren,     iiin    Kohle, z. B. Kohlenstaub,  zu     Formenpulver    brauchbar zu machen.       Kohlenstaub    wird bereits als     Formenpulver     in den Giessereien verwendet, aber der ge  wöhnliche Kohlenstaub hat den Nachteil, dass  er Feuchtigkeit aufsaugt, weil die     'Bitumen     in der Kohle nicht gleichmässig verteilt sind,  und deshalb keine sichere     Trennungsschicht     zwischen Modell und Formsand bildet. Um  diesen Übelstand zu beseitigen, versuchte  man, Kohlenstaub mit Ölen, Fetten, Harzen,  Wachsen usw. zu tränken.

   Durch diese Ver  fahren wird aber das Produkt verteuert  und klebrig. Ein solches     Formenpulver     bleibt am Modell haften und verändert die  Formen.  



  Versuche haben ergeben, dass die in der  Kohle enthaltenen Bitumen durch Erwärmung  sich gut verteilen und das Kohlenpulver dann  keine Feuchtigkeit aufsaugt und deshalb als       Formenpulver    gut zu verwenden ist. Ferner  wird eine innige Verteilung der Bitumen in  der Kohle durch eine     Pressung    erzielt, da  dabei auch eine Erwärmung und Verflüssi  gung der Bitumen eintritt und die Bitumen    sich unter Druck gut verteilen. Falls es not  wendig erscheint, der Kohle     wasserabstossende     Stoffe, wie Paraffin, Harze, Öle, Fette usw.

    beizumengen, so geschieht dies mit Vorteil  durch Pressung, weil dann eine geringe Quan  tität der wasserabstossenden     Stoffe    erforder  lich ist, da durch den     Druck,    wie schon er  wähnt, eine innige Verteilung der wasser  abstossenden     Stoffe    in der Kohle     stattfindet.     Die gepresste Kohle wird zu der erforderlichen  Feinheit als     Formenpulver    zerkleinert, und  das erhaltene Kohlenpulver ist nicht klebrig,  jedoch wasserabstossend und als Formen  pulver gut geeignet.



  Process for the production of mold powder from coal. The present invention is a method iiin coal, e.g. B. coal dust to make mold powder useful. Coal dust is already used as mold powder in the foundries, but the usual coal dust has the disadvantage that it absorbs moisture because the bitumen is not evenly distributed in the coal and therefore does not form a reliable separating layer between the model and molding sand. In order to remedy this problem, attempts were made to soak coal dust with oils, fats, resins, waxes, etc.

   However, this process makes the product more expensive and sticky. Such mold powder sticks to the model and changes the shapes.



  Tests have shown that the bitumen contained in the coal spreads well when heated and the coal powder then does not absorb any moisture and can therefore be used as a mold powder. Furthermore, an intimate distribution of the bitumen in the coal is achieved by pressing, since the bitumen is also heated and liquefied and the bitumen is well distributed under pressure. If it appears necessary to add water-repellent substances such as paraffin, resins, oils, fats, etc.

    add, this is advantageously done by pressing, because then a small quan tity of the water-repellent substances is required, because the pressure, as he mentioned, an intimate distribution of the water-repellent substances in the coal takes place. The pressed coal is crushed to the required fineness as mold powder, and the resulting carbon powder is not sticky, but water-repellent and well suited as mold powder.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung von Formen pulver aus Kohle, dadurch gekennzeichnet, dass dieselbe einer Erwärmung unterworfen wird, zum Zwecke, die Biturnen gleichmässig zu verteilen. UNTERANSPRüCHE 1. Verfahren nach Patentanspruch, dadurch gekennzeichnet, da1,) die Erwärmung der Kohle durch Pressung herbeigeführt wird. PATENT CLAIM: Process for the production of mold powder from coal, characterized in that it is subjected to heating for the purpose of distributing the biturns evenly. SUBClaims 1. Method according to claim, characterized in that da1,) the heating of the coal is brought about by pressing. 2. Verfahren nach Patentanspruch und Unter anspruch 1, dadurch gekennzeichnet, dar der Kohle, welche wenig Bitumen enthält, vi-)r der Erwärmung durch Pressung Harz stoffe beigemengt werden. 3. Verfahren nach Patentanspruch und Unter anspruch 1, dadurch gekennzeichnet, daP der Kohle, welche wenig Bitumen enthält, vor der ErwiLi#mung durch Pressung fett haltige Stoffe beigemengt werden. 2. The method according to claim and sub-claim 1, characterized in that the coal, which contains little bitumen, vi-) r the heating by pressing resin materials are added. 3. The method according to patent claim and sub-claim 1, characterized in that the coal, which contains little bitumen, is mixed with fatty substances by pressing prior to heating.
CH86882D 1917-07-04 1917-07-04 Process for the production of mold powder from coal. CH86882A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH86882T 1917-07-04

Publications (1)

Publication Number Publication Date
CH86882A true CH86882A (en) 1920-10-16

Family

ID=4343556

Family Applications (1)

Application Number Title Priority Date Filing Date
CH86882D CH86882A (en) 1917-07-04 1917-07-04 Process for the production of mold powder from coal.

Country Status (1)

Country Link
CH (1) CH86882A (en)

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