Pre-Concentration and Flotation of Alunitic Kaolin and its Possible Use in the Ceramic Tile Industry
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Dumlupinar University
Ilksem Ar&Ge, Eskisehir Osmangazi University Technopark
Publication date: 2015-01-01
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Nezahat Ediz   

Dumlupinar University, Department of Mining Engineering, Evliya Celebi Campus, Tavsanlı Yolu 10. km, 43000 Kutahya, Turkey
Physicochem. Probl. Miner. Process. 2015;51(1):213–231
The aim of this research was to remove the sulphur from alunitic kaolin sourced from the Balıkesir-Sındırgı region of Turkey, which is not currently used by ceramic industry because of its high sulphur content. Flotation was employed to remove sulphur (also the alunitic parts) from the kaolin samples. In the process, mineral alunite was floated while kaolinite was depressed. The effect of pre-concentration to the flotation process was also investigated. Pre-concentration included the processes such as wetting and mechanical scrubbing and screening for the separation of fine alunite particles and colouring oxides from kaolin as well as screening after consecutive milling for the separation of hard minerals such as quartz from kaolin. After the pre-concentration and flotation processes, kaolin concentrates having a SO3 content of 0.48% were obtained with a sulphur removal efficiency of 88.55% and this kaolin was coded as F4. Afterwards, the use of F4 kaolin in the ceramic industry was investigated. For this purpose, the F4 kaolin was used in angobe preparation and the angobes prepared were applied during the production of floor and wall tiles. The properties of the angobes obtained were also compared to those of commercial floor and wall tile angobes from a ceramic factory. After the tests, it was understood that the floor and wall tile angobes prepared by using F4 kaolin could be used as an alternative for the angobes currently used by the factory.