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If you don't have an extra one of these already, then you'll want to craft one real quick. Just throw eight cobblestone into your crafting table to make a furnace. You might want to create two furnaces, because one will be used in the process of creating the blast furnace.

We're going to need five iron ore, which can be found pretty much anywhere there's stone to be mined. Both caves and ravines are great places to find the ore. Any space that's opened up which gives you a lot of surface area to explore makes it easier to spot it. You also might see it in the side of a mountain or hill. If you can't find it that way, mine your way downwards, and you should eventually come across it. It's one of the more common ores you will find in the game.

We need five iron bars to create the iron bars we'll need for the blast furnace. This can be accomplished by throwing in our iron ore into a normal furnace with some fuel.

We need three smooth stone, so to create it we're going to need stone. This requires us to either have a silk touch pickaxe, which can mine stone and receive it normally, or we'll have to smelt some cobblestone. Once you've got your three normal stone, throw that in the furnace and heat it up into smooth stone!

Now all we need to do is put all our ingredients together to complete the blast furnace recipe! Place your furnace in the middle of the grid, place three iron bars across the top, one iron bar on either side of the furnace, and line the bottom with smooth stone to create it!