Delicately processed Copper Slag is an abrasive for blast cleaning. It is of high hardness, fast rust-removing, excellent efficiency, no harm to human health and low price. It is suitable for free lapping, blast cleaning and for making organic bonded abrasive tools. The results of application to shipbuilding, bridge construction indicates that copper slag is the best rust cleaner not only for above application but also for petrochemical and hydro-electrical industries. It is also an ideal useful product for building roads and pavements as well as floor of workshop.