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Also used for well-drilling fluids, bentonite suspends oil

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Ben Wood

The smectite clays, also known as montmorillonites, play a significant role in the group of three-layer clay minerals. Water molecules can be deposited inside the multi-layer packages thanks to the free bonding forces, which leads to expansion along the c-axis (intra-crystalline swelling). The electroneutrality of the overall lattice is disturbed when the octahedron coordination is ionised with ions that have different charges. Ions build up in the lattice and/or between the individual layers to balance charge differences. Regarding their use in the casting industry, these "exchangeable" ions have a significant impact on the behaviour (activation) of bentonite materials in practise.


Bentonite is a binding agent used in the pelletization process to create iron ore pellets. Through this method, iron ore fines are transformed into spherical pellets that can be used as feedstock in blast furnaces to produce pig iron or direct reduction iron (DRI). Construction and civil engineering: Bentonite is traditionally used as a support, lubricant, and thixotropic agent in diaphragm walls and foundations, tunnelling, horizontal directional drilling, and pipe jacking. Bentonite is also used in Portland cement and mortars because of its viscosity and plasticity.


Water treatment benefits greatly from the adsorption/absorption capabilities of bentonite. To ensure the protection of groundwater from pollutants, common environmental directives advise using low permeability soils, which naturally contain bentonite, as a sealing material when building and renovating landfills. The geosynthetic clay liners' active protective layer is bentonite.




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https://thrivearticles.weebly.com/article/bentonite-is-a-colloidal-clay-mineral-with-high-swelling-properties-and-good-viscosity-and-liquid-limit


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