The research of open-hearth slag as a perspective feedstock for the production of ceramic pigments. Study of granulometric and chemical composition of the slag. Report 1 - A. V. Zajchuk; Ja. I. Belyj; N. A. Minakova; E. V. Shovkopljas; A. A. Pivovarov; Ju. A. Pivovarov (Metal and casting of Ukraine, 2011)