THE USING OF ADDITIVES OF QUARTZ AND QUARTZ- FELDSPAR IN THE SANDS FOR IRON CASTING

Abstract

The  investigations were carried  out on  the using of quartz and  quartz-feldspar in the sands for the casting forms and cores of the iron casting. The need for quartz and quartz-feldspar application as molding mixtures was demonstrated for both iron castings with the mass as high as 1500  kg and  drying cylinders with a mass  as high as 36 tons. The conclusion was drawn about the advantage of  Gusarovsk's, Karelian  and  Finnish sands over the employed quartz sands. Besides the sands, the Portland cement, clay,  liquid  glass, graphite and  shungite were tried. The  carbon-contained materials were introduced into the mixture to improve the molding performance, physical   and    mechanical  characteristics,   and    anti adhesive properties. The mixture specifications, melting and casting technique were developed. It was shown that in order to cast the drying cylinder's body for the paper- making machines one has to fabricate cores out of sands which must have the grain size 0,5‒1,0 mm and the clay contain at most 0,6 %. Ill. 2. Ref. 7. Tab. 3.