Bentonites


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Bentonites

 

colloidal clays that consist primarily of minerals of the montmorillonite group—Al2[Si4O10](OH)2 nH20. The formation of bentonites results from the chemical alteration of volcanic rock (tuffs and ashes), apparently under conditions of the sea floor. Bentonites are widely used in the petroleum industry for the production of boring solutions, as bleaching clays, and as cementing material in foundry molding sands and ceramic bodies. The largest bentonite deposits in the USSR are found in Turkmenia and Georgia; the largest deposits abroad are in the USA, Mexico, Italy, and Rumania.

References in periodicals archive ?
Bore-Gel: Specifically blended system using high-yield Wyoming sodium bentonite.
IKOQUICK[R]--the innovative solution to maximum quality with select grades of Sodium and Calcium Bentonite with the addition of organic additives.
Vanderbilt, Norwalk, CT, sells a bentonite called Vanatural.
Dynamics of mining of bentonite clay and production of drill mud by JSC "Dashukovskie bentonites" in 2003-2007, kt
The abundance of biotite flakes was a good criterion for recognizing volcanogenic bentonites in situ.
The main uses of bentonite and fuller's earth take advantage of their natural sorptive and thixotropic properties.
The clues for such a large eruption 454 million years ago come from layers of soft rock called bentonite that appear frequently in deposits from Earth's Ordovician period.
The low resistivity of the bentonites probably reflects different clay minerals with high cation exchange capacity, such as mix-layer clays compared with the inter-bedded shale that in part is silicified.
These green sand products work well with western (sodium) and southern (calcium) bentonite and their blends and improve mold squeezability and reduce brittleness.
The poster entitled, "Evaluation of the antiviral activity of different modifications of nano-bentonite clay against the Human Influenza (H3N2) Virus, Avian Influenza (H5N1) Virus and the Human Immunodeficiency Virus" outlines reduction in viral activity of selected viruses from AMCOL modified bentonites.