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Carbon Capture - Acid rock drainage treatment Project

 

Mines struggle to responsibly treat and prevent acid rock drainage (ARD). The most prevalent ARD treatment consists of applying lime, a process with a significant indirect CO2 footprint.

We developed a patented method to treat and prevent ARD using iron carbonate "armour" made by combining acid rock drainage and CO2 emissions using an electrochemical bicarbonate route. 

 Siderite (Iron Carbonate) synthesized from an ARD stream and electrochemical alkalinity. 

Siderite (Iron Carbonate) synthesized from an ARD stream and electrochemical alkalinity. 

Converting metal-rich acidic waters to clean water and solid carbonate minerals can be attractive at mines for several reasons, including  pollutant sequestration, positive effects on mine water pH, and potentially improved substrate for future plant growth. 

Over time, exposed iron carbonate oxidizes to nano-scale iron minerals that could play an important role in adsorption of heavy metals in the tailings environment.