While Minecraft allows you to recycle some iron items like armor and tools, there are still several items that cannot be recycled. These include iron bars, iron doors, buckets, and several other items as well. With this datapack, these can also be recycled. Each item recycled gives one iron ingot when smelted. In addition, the recycling can be done in an ordinary furnace or in a blast furnace, whichever you prefer or have available. As always, enjoy!