1) Enrich to prevent goiters 2) Iodise 3) Process 4) Process the salt 5) To treat or react with iodine 6) Treat 7) Treat as salt 8) Treat salt 9) Treat salt in a way 10) Treat with element 53 11) Treat with iodine 12) Work on salt Found on https://www.crosswordclues.com/clue/iodize
I'o·dize transitive verb [ imperfect & past participle Iodized ; present participle & verbal noun Iodizing .] To treat or impregnate with iodine or its compounds; as, to iodize a plate for photography. R. Hunt. Found on http://www.encyclo.co.uk/webster/I/94