The Collaborative International Dictionary of English v.0.48:

Smelt \Smelt\, v. t. [imp. & p. p. Smelted; p. pr. & vb. n.
   Smelting.] [Of foreign origin; cf. Sw. sm[aum]lta, D.
   smelten, Dan. smelte, Icel. smelta, G. schmelzen OHG.
   smelzan, smelzen; probably akin to Gr. ?????. Cf. Enamel,
   Melt, Mute, v. i., Smalt.] (Metal.)
   To melt or fuse, as, ore, for the purpose of separating and
   refining the metal; hence, to reduce; to refine; to flux or
   scorify; as, to smelt tin.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Smelting \Smelt"ing\,
   a. & n. from Smelt.
   [1913 Webster]

   Smelting furnace (Metal.), a furnace in which ores are
      smelted or reduced.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

73 Moby Thesaurus words for "smelting":
   architecture, assembly, blazing, blistering, branding, building,
   burning, calcination, carbonization, casting, cauterization,
   cautery, cineration, combustion, composition, concremation,
   construction, conversion, cracking, crafting, craftsmanship,
   creation, cremation, cultivation, cupellation, deflagration,
   destructive distillation, devising, distillation, distilling,
   elaboration, erection, extraction, fabrication, fashioning,
   flaming, formation, forming, formulation, framing, growing,
   handicraft, handiwork, harvesting, incineration, machining, making,
   manufacture, manufacturing, milling, mining, molding, oxidation,
   oxidization, parching, prefabrication, preparation, processing,
   producing, pyrolysis, raising, refining, scorching, scorification,
   searing, self-immolation, shaping, singeing, suttee, the stake,
   thermogenesis, vesication, workmanship