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Companies turn waste into improved cement

Alcoa Canada Primary Metals, Nova Pb and St. Lawrence Cement have concluded a multi-year agreement to recycle spent...


Alcoa Canada Primary Metals, Nova Pb and St. Lawrence Cement have concluded a multi-year agreement to recycle spent aluminum pot-liner and other wastes generated at Alcoa’s Quebec smelters.

Aluminum pot-liner contains cyanide and fluoride and is banned from most landfill sites. Alcoa has been removing the pot-liner, neutralizing and storing it, but a new process called CALSiFrit will allow it to be recycled.

The technology, developed by Nova Pb, strengthens cement and also makes it more porous, reducing the moisture infiltration that causes deterioration. The product has gone through more than three years of development and full-scale trials.

St. Lawrence Cement has secured contracts to consume 100,000 tonnes of CALSiFrit to produce a new blended cement for the mining industry.

The project will allow over 50,000 tonnes of the industrial residue to be recycled over three years. In addition, as a partial replacement of Portland cement, it will result in a net reduction of over 70,000 tonnes of Greenhouse gas emissions, as compared to the normal production of Portland cement.

For more information contact Pierre Despres, Alcoa Canada, 514-904-5054, Brian McIver, Nova Pb, 450-632-9910 or Andre Laplante, St. Lawrence Cement, 450-651-1117. Or visit www.alcoa.com/Canada, www.novapb.com, www.calsifrit.com or www.stlawrencecement.com.


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