Hello I am hoping someone can share their knowledge I encountered a problem on a recent project at a site I visited. They are encountering enormous amounts of waste copper wire which they are sending away to scrap. 

My background is in the mining sector and I wanted to know what the process is to get copper wire into granulated copper and the wire armor and insulation in separate containers.

I know from research that a grinder will break up the cables. My main confusion is within separation of the copper/metals and insulation. Is this achieved used hydrocyclones, magnetic separation, vibration screens or flotation cells (only because a YouTube video appeared to mention this). 

Just to confirm I am specifically asking how they separate the different materials as in <https://youtu.be/ZKN5MtrY5Cg>