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Potential of Some Granites from Foumban (West Region of Cameroon) as Fluxing Materials for Ceramics

Journal of Minerals and Materials Characterization and Engineering 2020年第5期8卷 353-363页

作者： njimbouombouo mouliom soualiou Etone Macka Alexandre Dodo Ondoua Abondo Ebengue Yannick Che Randy Nangah Njoya André Mouncherou Oumar Farouk Ndigui Billong University of Yaounde I Yaounde Cameroon

This study focuses on the mineralogical, geochemical and petrographic characterization of three granite rock samples (LTP, LTS and LTMB) from Foumban, West Region of Cameroon. Fusibility tests were carried out on the samples containing the highest amount of alkali to assess the potential of these materials as fluxing admixture for ceramics. The results show that the granite consists of alkaline feldspars, notably orthoclase and microcline of perthitic micro-texture, plagioclases (in particular albite) and also mafic minerals such as amphibole and pyroxene. The quantity of alkali in the samples is quite high (16.83% for LTS, 17.08% for LTMB and 18.87% for LTP) compared to standard data. Fusibility tests carried out on the samples having the highest alkali content (LTMB and LTP) showed that the vitreous phase appears between 1050°C and 1100°C in these samples when they were heated. The Fe2O3 and TiO2 content of LTMB (3.01% and 1.49% respectively) led to a brown colour of its fired product. Therefore, based on their composition, these materials can be used as feldspathic fluxes for the formulation of ceramic products.

关键词： Feldspars Granite Characterization Fusibility Ceramics Foumban Cameroon

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Potential of Some Granites from Foumban (West Region of Cameroon) as Fluxing Materials for Ceramics

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Journal of Minerals and Materials Characterization and Engineering（矿物质和材料特性和工程） 2020年第5期

作者： njimbouombouo mouliom soualiou Etone Macka Alexandre Dodo Ondoua Abondo Ebengue Yannick Che Randy Nangah Njoya André Mouncherou Oumar Farouk Ndigui Billong

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Mineralogy, Petrography and Geochemistry of the Ina Syenite (Linté, Central Cameroon) as a Source of Industrial Feldspars

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Journal of Minerals and Materials Characterization and Engineering 2022年第3期10卷 287-318页

作者： soualiou njimbouombouo mouliom André Njoya Rose Yongue Fouateu Nguo Silvestre Kanouo Daniel Lamilen Mbila Bernard Charlier Nathalie Fagel Département de Géologie Université de Liège Liège Belgique Département des Géosciences Université de Yaoundé I Yaoundé Cameroun Mission de Promotion des Matériaux Locaux Yaoundé Cameroun Institut des beaux-arts Université de Dschang Foumban Cameroun Mineral Exploration and Ore Genesis Unit Department of Mining Engineering and Mineral Processing Faculty of Mines and Petroleum Industries University of Maroua Maroua Cameroon

The syenite from Ina (Central region of Cameroon) constitutes a 1000 km2 syntectonic batholith intruded in the Paleoproterozoic granitic basement. The aim of this work is to assess the potential of the Ina batholith syenite as a feldspar minerals resource for industrial use through petrographic and geochemical characterization. Most of the rocks are grey coloured and consist of shimmering feldspar phenocrysts in a fine-grained ferromagnesian matrix. Petrography reveals the presence of two major syenite facies: a widely distributed porphyritic syenite and a less-abundant massive syenite. These facies are dominated by phenocrysts of sub-automorphic perthitic orthoclase. Its malgachite face is due to the presence of numerous inclusions of opaque minerals observed by scanning electron microscopy (ESEM-EDX). Plagioclase phenocrysts have a zonal texture characterised microscopically by an oscillatory compositional zonation. Biotite, hornblende and augite, identified by X-ray powder diffraction, are finely disseminated in the feldspar matrix. Quartz appears as small automorphic crystals with maximum abundance of about 4 wt%. The XRF chemical composition reveals, alongside silica (59.29 wt% to 63.27 wt%), significant proportion of alumina (15.82 wt% to 19.80 wt%), potassium and sodium oxides considered as fluxing elements (K2O + Na2O ≥ 10 wt%). The K2O/Na2O ratio varies between 1.65 and 5.51 (average 2.58). Iron and titanium oxides (1 ≥ wt% Fe2O3 + TiO2 ≥ 5), harmful in ceramic industry, are high as in most other feldspathic sources. The characteristics of the Ina syenite are close to most of the syenite ores used worldwide for ceramics and glass raw materials and necessitates purification and beneficiation treatments. Others rock types have been identified at the study site (granite, monzonite, granodiorite) and are considered as inappropriate as a source of industrial feldspars.

关键词： Ina Syenite Petrography Mineralogy Feldspathic Fluxes

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