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Characterization of feldspar and quartz raw materials in Uganda for manufacture of electrical porcelains
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Mechanical Metallurgy.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Mechanical Metallurgy.
2006 (English)In: Journal of the Australasian Ceramic Society, ISSN 1018-6689, Vol. 42, no 1, 29-35 p.Article in journal (Refereed) Published
Abstract [en]

Electric porcelains are widely used for insulation purposes. The aim of this study is to characterize feldspar and quartz raw materials in Uganda for use in manufacture of electric porcelains. Samples from two deposits of each feldspar and silica are investigated to assess their potential as raw materials in the manufacture of electric porcelains. Raw samples ground to powder form are investigated by means of X-ray diffraction, thermal analysis, and scanning electron microscopy. In addition, the chemical composition, particle size distribution and density of the powders are determined. The study reveals one of the feldspar deposits to consist of purely ordered microcline, while the other has ordered microcline, quartz and albite. The silica deposits are purely of quartz mineral. The materials investigated, are suitable for use in porcelain production.

Place, publisher, year, edition, pages
2006. Vol. 42, no 1, 29-35 p.
Keyword [en]
Engineering controlled terms: Characterization; Composition; Deposits; Feldspar; Manufacture; Particle size analysis; Powders; Quartz; Raw materials; Silica; Thermoanalysis; X ray diffraction analysis
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-5866Scopus ID: 2-s2.0-33645638858OAI: oai:DiVA.org:kth-5866DiVA: diva2:10387
Note

QC 20100706

Available from: 2006-05-31 Created: 2006-05-31 Last updated: 2016-12-13Bibliographically approved
In thesis
1. Assessment of ceramic raw materials in Uganda for electrical porcelain
Open this publication in new window or tab >>Assessment of ceramic raw materials in Uganda for electrical porcelain
2006 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

Clay, quartz and feldspar are widely available in Uganda. The location and properties of various clay deposits are reported in the literature, but little is reported on feldspar and quartz deposits. In this work an extended literature on ceramics and porcelains in particular, is documented. Samples from two deposits of feldspar and two deposits of quartz are characterised and found to possess requisite properties for making porcelain insulators. Sample porcelain bodies are made from materials collected from selected deposits using different mixing proportions of clay, feldspar and quartz. Their properties in relation to workability, firing temperature, dielectric and bending strengths are studied. It is found that a mixture consisting of 30% Mutaka kaolin, 15% Mukono ball clay, 30% Mutaka feldspar and 25% Lido beach flint yields a body with highest mechanical strength (72MPa) and dielectric strength (19kV/mm) when fired at 1250°C. The strength (both mechanical and dielectric) is found to decrease with increasing firing temperature. At high firing temperatures, the undissolved quartz in the body decreased, the glass content increases and pores are formed. Mullite content on the other hand does not change at temperatures above 1200°C but there are significant differences in the morphologies of the mullite crystals in the samples. Optimum mechanical and electrical properties are found at maximum virtification and a microstructure showing small closely packed mullite needles.

Place, publisher, year, edition, pages
Stockholm: KTH, 2006. ii, 20 p.
Series
KTH/MSE--06/45--SE+MEK/AVH
Keyword
porcelain, characterisation, bending strength, dielectric strength, Uganda
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-4013 (URN)91-7178-408-X (ISBN)
Presentation
2006-06-02, Konferensrum K408, KTH, Brinellvägen 23, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20101122Available from: 2006-05-31 Created: 2006-05-31 Last updated: 2010-11-22Bibliographically approved

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