"Copper slag blasting" refers to a surface cleaning process where a high-pressure stream of small, angular copper slag particles is propelled against a surface to remove rust, old paint, or other contaminants, utilizing the hard and dense nature of copper slag, a byproduct of copper smelting, as an abrasive blasting media, offering advantages like efficient cleaning power, minimal environmental impact compared to traditional sand blasting, and suitability for various metal and concrete surfaces; making it a popular choice in industrial applications for surface preparation before coating or further processing.