Chamotte lightweight refractories made by casting

Abstract

In the manufacture of lightweight artifacts coke, sawdust, mixtures of sawdust and lignin [1][2][3], and thermoplastic resins are used as combustible additives. Foreign manufacturers of lightweight artifacts use expanded polystyrene [4]. In the Soviet Union research is being carried out on the use of expanded polystyrene in the manufacture of high-alumina lightweight artifacts from self-packing masses or by vibrocompaction [5,6].We have developed a procedure for obtaining chamotte lightweight artifacts with an apparent density ranging from 0.3 to 0.7 g/cm 3 by casting. The starting materials were Druzhkov clay and chamotte from Novoselki kaolin; the combustible additive was PSV-S polystyrene with a grain size less than 0.4 mm. The polystyrene was expanded in boiling water, dried, and sifted into fractions.The masses for casting (they had the consistency of thick sour cream) were prepared in a propeller mixer. Artifacts of normal size were cast in metal molds on metal hearths, dried, and roasted in a gaschamber kiln at 1300~To select the optimal ratio of clay to chamotte in the charge, we made artifacts of three compositions (Nos.