How to pronounce “slag”(noun) in English

The next story that I wrote after that was called The People of Sand and Slag, and it was nominated for the Hugo and Nebula awards.

Dam in North America taller than the Space Needle in a seismic area um to sift through all of this slag and create

Well, a little later on, planetary scientists said, OK, well, sure, you know, that's going to happen, and the Earth's crust will be melted down to slag.