Roof, attic, intermediate ceiling - How to dispose of old mineral wool?

We also had to dispose of huge amounts of that stuff during the demolition. I stuffed it into blue bags and then put the bags into the big bags of the landfill that we have to use for that here. I worked with a mask and safety goggles. But even after showering, I still felt that stuff on my body for a while. So pack it carefully on top if possible, keep all doors closed (if possible), and then bring it down in closed bags.