Is your feature request related to a problem? Please describe.
IC2 slag has limited use, but is esentially the same thing as Thermal Expansion slag.

Describe the solution you'd like
Ore dictionary the two or provide a way to convert them.

Additional context

Good idea!

This issue was moved by NillerMedDild to NillerMedDild/enigmatica2#201.

This issue was moved by NillerMedDild to NillerMedDild/enigmatica2expertskyblock#268.

@NillerMedDild
Please, consider adding slag from Immersive Engineering to the same OreDictionary.
Right now (v 1.46) it isn't very useful, but Blast and Arc furnaces produce a lot of one.

Alright :)