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Liquid Sodium Silicates

In water and lost circulation control, the gelation and precipitation reactions

are exploited in a cost-effective way. Silicates are very stable and do not cause

the adverse environmental effects associated with most other gel-forming

chemicals. Sodium silicate reactions can take place via an externally or
internally placed setting agent

Soluble silicates contain three components: silica, alkali and water – silica
molecules exist as monomeric to polymeric forms in equilibrium. The silica

tetrahedra can link to form chains, cyclic and larger polymeric structures.

SiO2:Na2O ratio plays a major role in polymerization. When pH is lowered such

that the solubility limit is surpassed, the silicate species cross-link to form a
silica gel

These other products can be susceptible to degradation over time and
temperature, unlike silicates, which are thermostable and are more

environmentally acceptable.

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