PL200B1

PL200B1 - A method of making molding powder from coal.

Info

Publication number: PL200B1
Application number: PL200A
Authority: PL
Filing date: 1919-09-23
Publication date: 1924-06-28

Description

Przedmiotem niniejszego wynalazku jest sposób spozytkowania pylu weglo¬ wego do wyrobu proszku formierskiego.Pyl weglowy uzywa sie w odlewniach jako proszek formierski, lecz zwykly pyl weglowy posiada te zla strone, ze wciaga wilgoc, poniewaz bitumen w weglu nie jest rozdzielony jednostajnie, wskutek czego pyl ten nie tworzy zupelnie war¬ stewki oddzielajacej pomiedzy modelem i piaskiem formierskim. Azeby usunac ten brak, próbowano nasycac pyl we¬ glowy olejami, tluszczami, zywicami, woskami i t. p. Te jednak srodki czynia produkt drogim i kleistym. Taki pro¬ szek formierski czepia sie modelu i zmie¬ nia ksztalty odlewu.Doswiadczenia wykazaly, ze bitumy zawarte w weglu przy ogrzewaniu roz¬ dzielaja sie jednoczesnie i wskutek tego pyl weglowy przestaje wciagac wilgoc, przeto moze byc zastosowany jako pro¬ szek formierski. Dalej wewnetrzne roz¬ dzielenie bitumów w weglu mozna rów¬ niez osiagnac zapomoca cisnienia, po¬ niewaz wywoluje ono ogrzanie i' za¬ miane bitumów na ciala plynne, które pod cisnieniem rozchodza sie jednostaj¬ nie. Jezeli wyniknie koniecznosc do¬ mieszki do wegla niehygroskopijnych cial jak np. parafina, zywica, oleje, tlu¬ szcze i t. d., to osiaga sie to z dobrym skutkiem pod cisnieniem, poniewaz przez to zuzywaja sie mniejsze ilosci tych cial i oprócz tego cisnienie, jak o tein wzmiankowano, wywoluje wewnatrz we¬ gla równomierny ich podzial. Spraso¬ wany wegiel zostaje nastepnie odpo¬ wiednio zmielony na proszek formierski i otrzymany w ten sposób pyl weglowynie jest kleisty, nie wciaga wody i na¬ daje sie znakomicie jako proszek for¬ mierski. PLThe present invention relates to a method of using coal dust to make molding powder. Coal dust is used in foundries as molding powder, but ordinary coal dust has the disadvantage of attracting moisture because the bitumen in the carbon is not divided uniformly, so that the dust is not uniformly distributed in foundries. this does not completely form a separation layer between the pattern and the sand. To remedy this deficiency, attempts have been made to saturate the coal dust with oils, fats, resins, waxes, etc. These measures, however, make the product expensive and sticky. Such a molding powder adheres to the pattern and changes the shape of the casting. Experience has shown that the bitumens contained in the carbon are simultaneously separated when heated, and as a result, the coal dust no longer attracts moisture, so it can be used as a molding powder. Further, the internal separation of the bitumen in the carbon can also be achieved without the aid of the pressure aid, since it causes heating and the conversion of the bitumen into liquid bodies, which is uniformly distributed under pressure. If there is a need for an admixture for the carbon of nonhygroscopic bodies, such as paraffin, resin, oils, fat, etc., this is achieved with good results under pressure, because less of these bodies are consumed and, in addition, pressure, such as theine mentioned causes an even distribution inside the coal. The compressed coal is then suitably ground into a molding powder, and the resulting carbon dust is sticky, does not attract water and is excellent as a molding powder. PL

Claims

Patent claims. 1. The method of producing a molding powder from coal, the main characteristic of which is that the coal dust used for the production is heated.

2. The method of claim It is notable that, by the pressure, the internal separation of the bitumen in the carbon is induced.

3. The method of claim 1, or possibly 1 and 2, the latter characterized by the fact that the coal, containing a small amount of bitumen, is mixed before or during processing with resins, oils, fat and the like, which additives separate inside the coal uniformly by applying pressure. WKLGfWF.KOZlANSKI IN WARSZADM PL