Wurno, Dange and Weppa Gypsums for Plaster and Ceramic Production : Current School News

Comparative Analyses of Wurno, Dange and Weppa Gypsums in Nigeria for Plaster and Ceramic Production

Filed in Current Projects, Industrial Design by on September 30, 2022

Comparative Analyses of WurnoDange and Weppa Gypsums in Nigeria for Plaster and Ceramic Production.

ABSTRACT  

The raw mineral used world-wide in the production of plaster of Paris is gypsum. This is available in Nigeria. Constant importation of plaster of Paris constitutes a drain on national economy and an added cost on ceramic mass production.

Its availability has prompted the central direction of this project to analyse, in a comparative way and to see the possibility of local usage which is likely to cut down cost of ceramic production.

Gypsum was obtained from three locations, Wurno and Dange in Sokoto State and Weppa in Edo state. The three samples obtained were labelled and transported from sites to the Ceramic Section, Department of Industrial Design, Ahmadu Bello University, Zaria.

They were beneficiated and calcined at the Industrial Development Centre (IDC) at the temperature of 1700C. This was done for the three samples from these locations.

Various tests were carried out and they included absorbency, shrinkage, compressive and density tests. These tests aided in determining performance of processed plaster of Paris for ceramic mass production.

Results showed that the ratio mix of 75-85 plaster/water ratio mix were suitable for ceramic slip casting process. 65 and 70 plaster/water ratio mix were better used for casting models and press moulding process.

INTRODUCTION  

The normal production processes involved in ceramic design and practice is often times tedious and demanding.

The necessities for faster mode of production such as the use of plaster of Paris mould, have become imperative for ceramic production process in recent times.

The production and use of moulds in their various forms seem to bring relief and solution to initial production methods that seem more strenuous at accomplishing mass production.

Although there are various types of moulds, the plaster of Paris mould appears to be the type common with most ceramic mass productions. Ceramic moulds are made from plaster of Paris produced from gypsum.

It was first developed in Montmartre, France around 1770, which gave rise to its name plaster of Paris and the discovery revolutionised mass production by slip casting.

Gypsum is a rock or natural mineral that is mined from the earth, usually referred to as hydrous calcium sulphate, or (CaSO₄.2H₂O).

When gypsum is exposed to heat treatment, 75% of water loss is recorded. This changes it to hemihydrates (CaSO₄.½H₂O).

REFERENCES

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Afolabi, M. (1992). Writing the research Proposal. Published by Dr Michael Afolabi,
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Ahuwan, A. M.(2003). Contemporary Ceramics in Nigeria, 1952 – 2002, Achievements and
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Akomolafe, I. I. (1991). Utilization of Some Locally Identifiable Material for Glass Mould
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Akpakip, (1993). The Development of Plaster of Paris from Gypsum for Ceramic Mould
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