CHEMICAL CONTENTS AND FOUNDRY CHARACTERISTICS OF DARAZO SAND DEPOSIT *Yaro, S.A, **Sulaiman, M. U. and *Aigbodion, V.S

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Volume 4, No 1, April 2009

CHEMICAL CONTENTS AND FOUNDRY CHARACTERISTICS OF DARAZO SAND DEPOSIT

*Yaro, S.A, **Sulaiman, M. U. and *Aigbodion, V.S

ABSTRACT

The chemical contents and foundry characteristics of Darazo sand deposit have been determined. The chemical composition of the clay was first determined and then moulding mixtures (sand +water only) of varying water contents were produced and their foundry properties determined.  The result of the investigation revealed that Darazo sand deposit has a Grain Fineness Number (GFN) of 98.40, American Foundry Society (AFS) specification. Based on this value, the sand can be considered to belong to the class of very fine sand as the GFN value of 100 is ranked the finest.  Also from the particle size distribution, the sand can be considered to have met the AFS specification of moulding sand of four sieve-sand since the bulk of the retained sand is on four consecutive sieves corresponding to 250μm, 180μm, 125μm, and 90μm size fractions. The chemical composition of the sand revealed that it is a high silica (85.15%) sand with little alumina (1.57%) and appreciable amount of iron (2.40%) which may be responsible for its reddish colour. The values of the moulding parameters (foundry properties) obtained for the moulding mixtures produced consisting of the sand and water only compared favourably with the recommended values for use in green and dry sand casting of non-ferrous metals

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ISSN: 2006-1919 (print)
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