GlassLock Process™ Stabilize arsenic in your mining operations

Patented process to remove and stabilize arsenic

Dundee Sustainable Technologies’ GlassLock Process removes and stabilizes arsenic that is often associated with precious and base metals deposits. With this cost-effective approach, the arsenic is incorporated into a highly stable and insoluble glass matrix that can contain up to 20% arsenic.

The GlassLock Process mitigates the environmental risks that have impacted the mining and smelting industries for decades. Allowing you to meet or exceed the United States Environmental Agency’s (EPA) toxicity characterization leaching procedures, the GlassLock Process can stabilize arsenic for a variety of applications, including:

  • Metallurgical flue dusts (smelting)
  • Mineral concentrates (arsenopyrite, cobaltite, enargite, tennantite)
  • Soluble arsenic in Pregnant Leach Solutions (PLS), acidic or alkaline
  • Arsenic in tailings, tailing drainages and wastewater

How our process works to vitrify arsenic in mining and smelting

The GlassLock Process vitrifies arsenic by integrating it, under various forms, in a mixture of commonly available reagents, such as silica, recycled glass and hematite. The mixture is then vitrified producing a meta-stable oxide system. The arsenic compounds are stable, permanent and insoluble within an amorphous glass product, providing greater stability.


GlassLock Process™ benefits

  • Unbeatable CAPEX and OPEX savings
  • Robust, stable and insoluble glass product
  • Increased operational efficiency
  • Decreased current and future environmental liabilities
  • Reduced carbon footprint

The proof is in the numbers

  • Incorporates up to 20% arsenic within glass
  • Complies with environmental regulations (US EPA methods 1311, 1315…)
  • Achieves <$1000 per tonne of arsenic stabilised
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