Suitability of Different Local Sands as Moulding Sand in Foundry Industry
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Availability, Binders, Collapsibility, Moulds, Metal, Permeability, Refractoriness, Sand.
Abstract
Moulds that are made of sand are relatively cheap, and sufficiently refractory for high temperature use. In addition to the sand, a suitable binder is mixed with the sand. This paper presents a comparative study on the usability and suitability of different local sands and binders for metal casting operations. Four different types of sands and three binders were combined successfully in different design mixtures. The sands under study were Red sand (Ashkida), silica sand (Zallaf), red well sand and white well sand. Soil texture determination method was carried out to determine the type of sand. The binders used in the mixtures were sugar solution, dates extract and local clay. Certain properties concerning sand casting were investigated which were; the mixture strength, collapsibility, refractoriness, permeability and availability. The experimental results show that the best mixture for casting is (silica + clay) which tolerate a temperature of about 1373.15 K, and compression strength of 750 N. In addition, the silica sand has the highest value of permeability (2.31 K (cm/h) as compared with the other types of sands.
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