DE355881C - Process for the production of molding sand - Google Patents

Process for the production of molding sand

Info

Publication number
DE355881C
DE355881C DEK77803D DEK0077803D DE355881C DE 355881 C DE355881 C DE 355881C DE K77803 D DEK77803 D DE K77803D DE K0077803 D DEK0077803 D DE K0077803D DE 355881 C DE355881 C DE 355881C
Authority
DE
Germany
Prior art keywords
production
molding sand
sand
water
coal
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
Application number
DEK77803D
Other languages
German (de)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CHEM FAB GmbH
FRITZ KRIPKE
Original Assignee
CHEM FAB GmbH
FRITZ KRIPKE
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 CHEM FAB GmbH, FRITZ KRIPKE filed Critical CHEM FAB GmbH
Priority to DEK77803D priority Critical patent/DE355881C/en
Application granted granted Critical
Publication of DE355881C publication Critical patent/DE355881C/en
Expired legal-status Critical Current

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Coke Industry (AREA)

Description

Verfahren zur Herstellung von Formsand. Dem Sande zur Herstellung von Formen für Eisenguß wird allgemein Steinkohlenpulver zugesetzt. Es wurde gefunden, daß sich die Steinkohle vorteilhaft durch die billigere Braunkohle ersetzen fäßt. Braunkohle ist aber von Wasser schwer b.enetzbar. Während sich Steinkohle leicht mit dem feuchten Sande mischt, oder eine Mischung von trocknem Sande mit Steinkohlen sich leicht anfeuchten läßt, erfordert die Mischung mit Braunkohle sehr lange Zeit. Man kann diesen Übelstand vermeiden, wenn man an Stelle gewöhnlicher Braunkohle eine wenig oder gar nicht wasserabstoßende Braunkohle, z. B. eine weitgehend in Alkalien lösliche Braunkohle, die sog. Hiiminsäure, verwendet, oder Braunkohle, der auf irgendeine Weise die Eigenschaft, wasserabstoßend zu sein, genommen ist, z. B. dadurch, daß man ihr das Wachs entzieht, odej daß man sie mit hygroskopischen Stoffen, wie Glyzerin, Chlorkalzium oder Chlormagnesium, mischt. Während wasserabstoßende Braunkohlenpulver und Torfmull, der Huminsäure enthält, bereits als Formpuder zum Bestäuben der Formen in der Gießerei verwendet werden, sind derartige Stoffe als Steinkohlenersatz nur brauchbar, wenn ihnen die schwere Benetzbarkeit durch Wasser fehlt oder genommen ist.Process for the production of molding sand. The sand to manufacture Coal powder is generally added to molds for iron casting. It was found, that the hard coal can advantageously be replaced by the cheaper lignite. However, lignite is difficult to wet with water. While hard coal is easy mixes with the wet sand, or a mix of dry sand with bituminous coals can be easily moistened, the mixture with brown coal requires a very long time. You can avoid this problem if you take the place of ordinary brown coal a little or no water-repellent brown coal, e.g. B. a largely in Alkali-soluble lignite, the so-called hiimic acid, used, or lignite, which is in some way deprived of the property of being water-repellent, z. B. by removing the wax from it, or by treating it with hygroscopic ones Mixes substances such as glycerine, calcium chloride or magnesium chloride. While water repellent Brown coal powder and peat waste, which contains humic acid, are already used as molding powder for Such substances are considered as dusting the molds used in the foundry Coal substitute is only useful if it is difficult to wet it with water missing or taken.

Bei -Verwendung von Braunkohle an Stelle von Steinkohle erhält dass Eisen eine schöne, helle Farbe.When using lignite instead of hard coal, that Iron a nice, light color.

Claims (1)

PATENT- ANSPRÜCHE: i. Verfahren zur Herstellung von Formsand, dadurch gekennzeichnet; daß dem Sande Braunkohlenpulver zugemischt wird. a. Verfahren nach Anspruch z, dadurch gekennzeichnet, daß statt gewöhnlicher Braunkohle solche verwendet wird, die nicht wasserabstoßend ist.PATENT CLAIMS: i. Process for the production of molding sand, thereby marked; that brown coal powder is mixed with the sand. a. Procedure according to Claim z, characterized in that such is used instead of ordinary brown coal that is not water-repellent.
DEK77803D 1921-05-29 1921-05-29 Process for the production of molding sand Expired DE355881C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEK77803D DE355881C (en) 1921-05-29 1921-05-29 Process for the production of molding sand

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEK77803D DE355881C (en) 1921-05-29 1921-05-29 Process for the production of molding sand

Publications (1)

Publication Number Publication Date
DE355881C true DE355881C (en) 1922-07-08

Family

ID=7233120

Family Applications (1)

Application Number Title Priority Date Filing Date
DEK77803D Expired DE355881C (en) 1921-05-29 1921-05-29 Process for the production of molding sand

Country Status (1)

Country Link
DE (1) DE355881C (en)

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