Activated Clay, also known as Activated Bleaching Earth, is a specially treated clay material commonly derived from minerals such as Bentonite and Montmorillonite. The clay is activated through chemical treatment, typically with sulfuric acid or hydrochloric acid, or by thermal activation, to significantly increase its surface area and adsorption capacity. As a result of this activation process, the clay becomes highly effective at removing impurities, color bodies, and undesirable contaminants from liquids, making it an essential material in various industrial purification processes. Major Applications Activated Clay is widely used in:
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Refining and bleaching edible vegetable oils.
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Purification of lubricating oils.
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Refining mineral oils and paraffin waxes.
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Fuel purification in selected industrial applications.
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Treatment and re-refining of used oils.
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Chemical and pharmaceutical purification processes.
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Purification of waxes and hydrocarbon products.
Mechanism of Action:
Activated Clay functions primarily through adsorption, rather than absorption. Its highly porous structure and large surface area allow it to adsorb and retain various impurities, including:
Advantages:
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High efficiency in color removal.
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Improved oxidation stability of oils.
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Easy integration into filtration processes.
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Available in different grades for specific applications.
Types of Activated Clay:
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Natural Bleaching Earth – Naturally occurring clay with bleaching properties.
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Acid-Activated Clay – Chemically activated clay offering enhanced adsorption performance and the most commonly used type in industry.
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Thermally Activated Clay – Clay activated through controlled heat treatment.
Important Notes:
After use, activated clay becomes saturated with oil and impurities and must be disposed of or regenerated according to environmental regulations. The selection of the appropriate grade and dosage depends on the type of oil or liquid being treated, the desired color reduction, and the required purity level.
Activated Clay remains one of the most effective and economical adsorbents used in the purification and refining of oils, fats, waxes, fuels, and various chemical products.
