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Morphological forms of carbon and their utilizations at formation of iron casting surfaces

Jelinek P., Beňo J.

Archives of Foundry Engineering

2008

Vol. 8, iss. 2

67-70

Model pyrolysis made possible to identify three solid products of carbonaceous additives. Lustrous carbon is the most important form of the pyrolysis carbon. With its structure and physical and chemical properties it comes near to graphite. Amorphous carbon with turbo-stratic lattice, higher oxireactivity, and lower protective function against liquid metal comes near to carbon black. Semicoke also plays a non-negligible role. All forms of carbon have an important representation in oolitized quartz grain also during forming the casting surface. While amorphous carbon is formed directly from the gaseous phase by homogeneous nucleation, lustrous carbon, with regard to similarity of lattices with quartz, is formed by heterogeneous nucleation on grains. High covering power and low oxireactivity give its highest protecting power of the mould face. New experimental equipment made possible to check a possibility of use of new composite bentonite binders containing "process carbon" (graphite, anthracite, amorphous carbon). The BTEX content in exhalations and in waste sands too was considerably decreased with high smoothness of castings.

Wpływ demineralizacji kwasowej na strukturę materii organicznej węgli kamiennych, otrzymanych z nich inertynitów i półkoksów

Matuszewska A.

Karbo

1998

Nr 7

226-231

Przeprowadzono demineralizacją za pomocą HCI i HF próbek węgli, pól koksów i koncentratów inertynitowych. Próbki przed i po demineralizacji poddano badaniom metodami: analizy elementarnej, dyfrakcji rentgenowskiej i spektroskopü w podczerwieni. Stwierdzono, że proces odpopielania kwasami, oprócz korzystnego znacznego obniżenia zawartości substancji mineralnej w badanych próbkach, spowodował również zmiany w wynikach przeprowadzonych analiz materii

A demineralisation for samples of coals, semi-cokes and inertinite concentrates by using of HC1 and HF was carried out. Samples before and after demineralisation were examined by following methods: elementary analysis, X-ray diffraction and infrared spectroscopy. It was stated that the process of ash removal by acids had resulted in a profitable reduction of mineral substances in examined samples as well as caused changes in organic matter contents.