Grants and Contributions:

Grant or Award spanning more than one fiscal year (2017-2018 to 2018-2019).

Slag is a granular by-product of the steel-making process composed mainly of calcium and silicon oxides and isx000D
currently reused in several applications including as a cement additive and in place of gravel. Portsidex000D
Aggregates Ltd. has a contract with Nova Scotia Lands Inc. to process and sell all slag material left on thex000D
former steel plant and coke ovens sites in Sydney, Nova Scotia (NS). Air-cooled blast furnace slag (ACBFS),x000D
which comes from the smelting of iron from iron ore, has been more studied than open hearth slag (OHS) andx000D
reuse avenues have been established for this higher calcium content waste slag material. In contrast, OHS hasx000D
not been as well researched and active markets for reuse of this waste by-product of steel manufacturing arex000D
limited. OHS a lower calcium content and contains more iron than ACBFS, limiting its reuse options. In thisx000D
project, OHS from over a hundred years of steel making in Sydney, Nova Scotia will be tested for its ability tox000D
remove metals and acidity from coal mining wastewater and compared to the better-understood ACBFS. Twox000D
treatment processes will be tested, an active treatment process where energy is required for mixing of the slagx000D
with the mine wastewater, and a passive treatment process that could be used to line drainage systems fromx000D
abandoned mines. Given that OHS is a resource Portside Aggregates is interested in being able to exploit,x000D
finding new markets for this material through the technical expertise and resources available at the Center forx000D
Water Resource Studies (CWRS) at Dalhousie University will be beneficial for the company and thex000D
community by increasing potential sales and restoring the environment.