Waste Treatment
Many waste treatment operations require a neutralizing, suspending, or stabilizing agent to remove or fix the hazardous chemicals that are present in the water or soil being treated.  Hazardous chemicals requiring treatment may include heavy metals such as lead and copper in water or in soil and acids in soil (as in mine drainage).  PQ sodium silicate is a multi-functional safe chemical capable of sequestering metals and acidity in a variety of waste streams.  Sodium silicate is used routinely as well in mine fill or grouting applications to provide needed stabilization.  PQ sodium silicates can also be used to manufacture activated silica or colloidal silica for use in waste-water clarification and treatment.  PQ potassium silicates function similarly to sodium silicates but contain potassium, an agricultural nutrient compatible with soil applications.

How It Works
Soluble silicates have been shown to react with hazardous wastes to produce less hazardous substances.  They do so by converting soluble metals into insoluble metal silicates and by encapsulating hazardous organic and inorganic components within an acid-resistant matrix.  Silicates also react with calcium-based stabilizers to produce a superior final product.  Using soluble silicates to treat a waste stream typically results in a strong, low-permeability, chemically-stabilized solid that is easy to handle, transport, and landfill.

Using soluble silicate in waste treatment:
  • Reduces the amount of setting agent required for complete stabilization, thereby reducing raw material costs. 
  • Reduces the final volume of stabilized material requiring disposal, further reducing total treatment costs. 
  • Modifies the set time of setting agents to improve processing. 
  • Enhances final physical properties of the stabilized waste resulting in a stronger, less permeable matrix. 
  • Produces a stable solid product that is resistant to the leaching effects of acid.
Recommended Literature
Applications
Solidification and Stabilization

Contaminated Soil

Waste Water (See Water Treatment)
Health, Safety &
Environment
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