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 ?
The typical SB cutoff walls are constructed by first excavating a trench with 0.6 to 1.5 m in width while simultaneously filling the trench with bentonite-water slurry (typically 6-12% by dry weight of conventional bentonite) to maintain the trench stability.
The purposes of this present work are activation of Jordanian bentonite with hydrochloric acid and characterizing its physical and chemical properties.
Water is favourable for the saturation of bentonite, whereas gas has the opposite effect.
Such substances were applied as adsorbents: AG-5 absorbite, valley peat, and also natural sodium and calcium bentonite clays.
In this work, bentonite from Nkalagu was modified by thermal activation, acid activation and combined acid and thermal activation.
Several researchers have evaluated the feasibility of using wheat straw ash (WSA) and bentonite in normal concrete [9-11].
Supplementation of broiler chickens diet with sodium bentonite had not any adverse effects on their blood serum biochemical characteristics.
The deposits of the Calcium Bentonite are the most common among all the types.
Quik-Gel: Easy-to-mix, finely ground, premium-grade, high-yielding Wyoming sodium bentonite. Imparts viscosity, fluid loss control and gelling characteristics to freshwater-based fluids.