Clay Dispersion Flocculation Deflocculation With Picture

Viscosity of Bentonite Slurry vs. Calcium Concentration

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Flocculation And Deflocculation

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Flocculation Oil

Figure 13

Dry Bentonite Added to Electrolyte Solution

Figure 13

Dry Bentonite Added to Electrolyte Solution

Clay Water Interaction

Clay Interactions

We use several terms for describing the specific behavior of clay-water interactions. These are: aggregation, dispersion, flocculation and deflocculation (see Figure 14).

Figure 14 Types of Clay Associations

Figure 14 Types of Clay Associations

Dispersed And Deflocculate

The clay in its dry state has platelets stacked in face-to-face association, like a deck of cards. This is Aggregation. When the dry clay is placed into fresh water with no agitation, the packets adsorb water, hydrate, and swell. Upon agitation, the swollen packets disintegrate into individual plates or smaller packets of plates. This is Dispersion. As long as agitation continues, dispersion will be retained and further dispersion can occur. When agitation is stopped, clay platelets will be mutually attracted in edge-to-edge or edge-to-face association. This forces a structure similar to a house of cards, termed Flocculation. If an anionic chemical thinner (deflocculant) is added, such as polyphosphate, lignosul-fonate or lignite, etc., it neutralizes the positive edge charges on clay platelets and the flocculated state is now Deflocculated. When this deflocculated clay slurry encounters strong ionic contamination (NaCl, CaSO4, Ca(OH)2, etc.), the deflocculant chemical is often overpowered - leading again to flocculation and even to a sort of aggregation where water is lost from the clay surfaces.

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Responses

  • haile
    What is floculation and dispersion in bentonite muds?
    3 years ago
  • roman grant
    What does clay flocculation do in drilling fluids?
    11 months ago
  • orlaith
    What is deflocculation in drilling engineering?
    18 days ago

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