Answer: slags

AnswerCrossword Clue
SLAGSSmeltery leavings
slagsSLAG, to criticize, mock or deride
slagsrefuse matter separated during the smelting of a metal from its ore
SLAGSForms a residue when smelting ore
SLAGSCinder heaps
SLAGSDrosses
SLAGSPittsburgh byproduct
SLAGSSmelting leftovers
SLAGSSmelter wastes
SLAGSSmelting stuff
SLAGSBecomes smelting waste
SLAGSDenigrates, in British slang
SLAGSSmelting byproducts
SLAGSSteel impurities
SLAGSSmeltery wastes
SLAGSSmeltery remains
SLAGSProducts of smelting
SLAGSSmelting products.
SLAGSMine wastes.
SLAGSSmeltery by-products.
SLAGSForms into cinders.
SLAGSForms into dross.
SLAGSCinders.
SLAGSMetal wastes
SLAGSConverts into metallic waste
SLAGSForms into metallic waste
SLAGSSmelting residues