Production of Steel Casts in Two-Layer Moulds with Alkaline Binders Part 1. Backing sand with the alkaline inorganic binder RUDAL
Journal Title: Archiwum Odlewnictwa - Year 2011, Vol 11, Issue 2
Abstract
Steel casts in Z.N. POMET were produced in moulds made of the moulding sand Floster. This sand did not have good knocking out properties, required a significant binder addition (4.5-5.0 parts by weight), and the casting surface quality gave rise to clients objections. Therefore a decision of implementing two-layer moulds, in which the facing sand would consist of the moulding sand with an alkaline organic binder while the backing sand would be made of the moulding sand with an inorganic binder also of an alkaline character - was undertaken. The fraction of this last binder in the moulding sand mass would be smaller than that of the binder used up to now (water glass). The application of two moulding sands of the same chemical character (highly alkaline) should facilitate the reclamation process and improve the obtained reclaimed material quality, due to which it would be possible to increase the reclaim fraction in the moulding sand (up to now it was 50%). The results of the laboratory investigations of sands with the RUDAL binder are presented in the paper.
Authors and Affiliations
M. Holtzer, D. Drożyński, A. Bobrowski, E. Rozmiarek, B. Isendorf
Keywords
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