AT69487B - Process for the production of mold powder from coal. - Google Patents
Process for the production of mold powder from coal.Info
- Publication number
- AT69487B AT69487B AT69487DA AT69487B AT 69487 B AT69487 B AT 69487B AT 69487D A AT69487D A AT 69487DA AT 69487 B AT69487 B AT 69487B
- Authority
- AT
- Austria
- Prior art keywords
- coal
- mold powder
- production
- bitumen
- powder
- Prior art date
Links
- 239000003245 coal Substances 0.000 title claims description 11
- 238000000034 method Methods 0.000 title claims description 6
- 239000000843 powder Substances 0.000 title description 10
- 238000004519 manufacturing process Methods 0.000 title description 3
- 239000010426 asphalt Substances 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 3
- 239000003925 fat Substances 0.000 claims description 3
- 239000003921 oil Substances 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 239000005871 repellent Substances 0.000 description 4
- 239000002817 coal dust Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000003110 molding sand Substances 0.000 description 1
- -1 paraffins Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
Landscapes
- Solid Fuels And Fuel-Associated Substances (AREA)
- Working-Up Tar And Pitch (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
Description
<Desc/Clms Page number 1>
Verfahren zur Herstellung von Formenpulver aus Kohle.
EMI1.1
pulver brauchbar zu machen. Kohlenstaub wird bereits als Formenpulver in den Giessereien verwendet, aber der gewöhnliche 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 Verfahren 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 dadurch 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 Verflüssigung der Bitumen eintritt und die Bitumen sich unter Druck gut verteilen. Falls ea notwendig erscheint, der Kohle Wasser abstossende Stoffe, wie Paraffn, Harze, Öle, Fette usw., beizumengen, so geschieht dies mit Vorteil durch Pressung, weil dadurch eine geringe Quantität der Wasser abstossende Stoffe erforderlich ist, da durch den Druck, wie schon erwähnt, 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 Formenpulver gut geeignet.
PATENT-ANSPRÜCHE : i. Verfahren zur Herstellung von Formenpulver aus Kohle, dadurch gekennzeichnet, dass dieselbe einer Erwärmung unterworfen wird.
**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.
<Desc / Clms Page number 1>
Process for the production of mold powder from coal.
EMI1.1
to make powder usable. Coal dust is already used as mold powder in foundries, but the common 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 separation 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, these processes make 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 that the coal powder 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 paraffins, resins, oils, fats, etc., to the carbon, this is advantageously done by pressing, because this requires a small quantity of water-repellent substances, as already mentioned, there is an intimate distribution of the water-repellent substances in the coal.
The pressed coal is crushed to the required fineness as mold powder, and the carbon powder obtained is not sticky, but is water-repellent and well suited as mold powder.
PATENT CLAIMS: i. Process for the production of mold powder from charcoal, characterized in that it is subjected to heating.
** WARNING ** End of DESC field may overlap beginning of CLMS **.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT69487T | 1914-05-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AT69487B true AT69487B (en) | 1915-08-10 |
Family
ID=3591309
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AT69487D AT69487B (en) | 1914-05-20 | 1914-05-20 | Process for the production of mold powder from coal. |
Country Status (1)
| Country | Link |
|---|---|
| AT (1) | AT69487B (en) |
-
1914
- 1914-05-20 AT AT69487D patent/AT69487B/en active
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