Bentonite is an absorbent aluminium phyllosilicate which have a combination of minerals. Mainly used in industrial applications and formulations of cosmetics and pharmaceutical items, the bentonite provided by us can be availed in different chemical compositions. Bentonite is not itself a mineral name, but more correctly, it is a smectite clay composed primarily of the mineral Montmorillonite. Montmorillonite is a three layer mineral formed of several layers of tetrahedron and octahedron sheets, electrostatically held together by isomorphic interlayer cations. As the electrostatic attraction is low, exposure to polar fluids will cause the formation of a monomolecular lattice of water between the silicate layers. The basis behind bentonite swelling is that several layers of water dipoles can form into weak "stacked" tetrahedral structures, causing the silicate layers to separate - this is termed intercrystalline swelling. Particle Charge - Each crystal of Montmorillonite has a large net negative charge. Thus it tends to attract any positive ions (cations), such as Calcium or Sodium ions, to its surface. If the majority of these cations are Sodium, it is commonly referred to as a Sodium Bentonite. If the majority of the ions on the clay surface are Calcium, it is referred to as a Calcium Bentonite.
Sodium Based Bentonite
Sodium based bentonite has excellent colloidal properties. Possessing the property of swelling, the sodium bentonite when wet making it absorb several times its dry mass while in water.
Sodium bentonite finds applications in the following areas:
• In drilling mud for oil and gas wells
• For geotechnical and environmental investigations
• Useful as a sealant, especially for the sealing of subsurface disposal systems for spent nuclear fuel and for quarantining metal pollutants of groundwater
• For making slurry walls
• Waterproofing of below-grade walls
• Forming impermeable barriers like to seal off the annulus of a water well
• To plug old wells
• As a liner in the base of landfills to prevent migration of leachate
Having the capability of getting "sandwiched" between synthetic materials, sodium bentonite helps create geo-synthetic liners (GSL) for the aforementioned purposes.
This technique allows for more convenient transport and installation thereby reducing the volume of sodium bentonite required. The surface modifications to sodium bentonite can improve some rheological or sealing performance in geo- environmental applications.
Calcium bentonite powder is supplemented with double water layer particles with Ca++ as the exchangeable ion. Popularly known as calcium bentonite or non-swelling type bentonite, the calcium bentonite powder offered by us has about 35% finer yielding capacity than 0.5 micron.
Calcium bentonite is used in the following industrial applications:
• As grouting material
• In drilling mud
• As de-colourizerBentoniteCalcium
• As foundry sands
• In cosmetic and pharmaceutical preparations
Another conventional use of Bentonite is as a mud constituent for oil- and water- well drilling. Its role is mainly to seal the borehole walls, to remove drill cuttings and to lubricate the cutting head. The special higher mud yield results in using less quantity of Bentonite for the same standard mud. This results in lesser requirement of Bentonite.
Gives high barrel yield.
3% to 5% of Mineral develops 15 centipoise viscosity.
Little loss of drilling fluids.
Withstands formation pressure.
Matching weighting agents.
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