Production of desiccants from Turkish bentonites

G. Bulut*, M. Chimeddorj, F. Esenli, M. S. Çelik

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

52 Citations (Scopus)


Representative samples of three Turkish bentonites were investigated with the aim of producing moisture adsorbents, so-called desiccants, of commercial grade: 1) Ca-bentonite from Lalapaşa-Edirne region (LLP), 2) Na/Ca-bentonite from Çanki{dotless}ri{dotless} region (CNK), and 3) Na-bentonite from Reşadiye-Tokat region (RSD). The samples were composed of smectite and small amounts of quartz, feldspar, calcite and opal-CT and minor amounts of zeolite and dolomite. The clay mineral contents of the raw samples were estimated at 75-80% for LLP, 50-55% for CNK and 75-80% for RSD. The bentonites were upgraded by mineral processing techniques and modified by addition of calcium chloride. The effect of particle size, heat treatment conditions such as drying temperature and drying time were examined. A maximum moisture adsorption capacity of 17.1% was obtained after heating at 150-200 °C for LLP Ca-bentonite. The mixed bentonite (CNK) achieved a maximum moisture adsorption capacity of 8.3% at 105 °C and the Na-type bentonite (RSD) exhibited the lowest adsorption capacity of 6.4% at 105 °C. In addition to the standard tests and parameters, chemical additives such as calcium chloride which is known as a hygroscopic material were mixed with the bentonites. Moisture adsorption capacities of the bentonites were raised to a level about 20% above required as standards. The results obtained in this study together with the standard specifications were compatible with the commercial counterparts.

Original languageEnglish
Pages (from-to)141-147
Number of pages7
JournalApplied Clay Science
Issue number2
Publication statusPublished - Oct 2009


The authors would like to thank Istanbul Technical University-Scientific Research Project Center (BAP) and The Scientific and Technological Research Council of Turkey-TUBİTAK 106G106 for the support provided throughout this research and General Directorate of Mineral Research & Exploration (MTA) for XRD, DTA and chemical analyses.

FundersFunder number
Istanbul Technical University-Scientific Research Project Center
Scientific and Technological Research Council of Turkey-TUBİTAK106G106
British Association for Psychopharmacology
Mount Allison University


    • Bentonite
    • Desiccant
    • Moisture adsorption
    • Montmorillonite


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