Production of Ultrapure Bentonite Clays through Centrifugation Techniques

F. Boylu*, R. Hojiyev, G. Ersever, Y. Ulcay, M. S. Çelik

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


In this study, the production of ultrapure Na-bentonite by centrifuge based techniques for organo and nano composite bentonite industry was investigated. Various parameters including centrifuging time, solids content, and g force were studied to determine the set points (cut size) for theoretical CEC (cation exchange capacity) and recovery limits. The experimental results were modeled using Response Surface Method (RSM) with high responses (regression & 85% and correlation coefficients & 0.85). it is shown that the commercial centrifugation equipment operating with residence time of 10-15 seconds and g values lower than 300 g such as Multi Gravity separator (MGS), Hydrocyclones and Falcon/Knelson concentrators are not suitable for obtaining pure quality Na-bentonite, since the set point size (5-8 μm) is higher than 2 μm which is defined for bentonite of high smectite contents. The RSM models demonstrate that only the kind of separators such as decanter centrifuges with operational g forces higher than 600 may exhibit the closest set point to 2 μm and thus enable the achievement of an ultra pure quality bentonite product. These assumptions obtained from the developed model were confirmed by running tests on Falcon and Mozley hydrocyclone separators.

Original languageEnglish
Pages (from-to)842-849
Number of pages8
JournalSeparation Science and Technology
Issue number6
Publication statusPublished - Mar 2012


The authors would like to thank the Turkish Ministry of Science, Industry and Technology Programme for their financial support to carry out this study which is a part of our project (Project number: 00492.STZ.2009-2).

FundersFunder number
Turkish Ministry of Science, Industry and Technology Programme00492.STZ.2009-2


    • bentonite
    • centrifuging
    • decanter centrifuges
    • Falcon concentrator
    • hydrocyclone
    • response surface regression


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