Special Issue "Bentonite Deposits, Origin, Characterization and Industrial Uses"
Deadline for manuscript submissions: closed (10 July 2020).
Interests: raw materials characterization; industrial minerals in environmental applications; economic geology; green geochemistry; mineralogy; cementitious and construction materials; industrial clays; fillers–filters–absorbents; microporous raw materials; marine aggregates; raw materials policy; mine waste reuse; environmental impacts; ecosystems; geoarchaeology; natural heritage
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The term bentonite is used for clayey material mainly composed of smectite group minerals—usually montmorillonite, saponite, nontronite, hectorite, and beidellite. Bentonites are broadly distributed around the world, with mine production led by China, the USA, Turkey, Greece, and India. Bentonites are mainly formed from the alteration of pyroclastic and/or volcaniclastic rocks. Clays like bentonite and clay minerals are studied and characterized by a variety of methods and techniques, including X-ray diffraction, infrared and MAS NMR spectroscopies in-situ synchrotron powder X-ray diffraction analysis, atomic force microscopy, scanning electron microscopy, and transmission electron microscopy.
In order to improve its properties, bentonite is in some cases modified by various techniques, e.g., thermal treatment, organoclay synthesis. Both raw and modified bentonite have a large number of uses and industrial applications. Some of these are: drilling muds, iron–ore pelletizing, waste water treatment, foundry sands, catalysis, agriculture, paper, cat litter, cosmetics, and pharmaceutical products. The suitability of bentonite depends on its physical, chemical, and mineralogical properties, such as smectite mineral content, presence of sulphates and/or sulphides, cation exchange capacity (CEC), hydrated radius of the interlayer cation, particle size distribution, and specific surface area (SSA). Different bentonite applications require a different set of properties, and therefore, their investigation is a rather demanding scientific area.
Prof. Dr. Michael G. Stamatakis
Manuscript Submission Information
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- industrial applications