A kiln is a special kind of furnace used for certain baking and smelting recipes. Unlike a normal furnace, a kiln takes a considerably larger amount of time to output items, but with the difference of being capable of processing batches of multiple items at a time. There are three tiers of kiln, and each one is faster and more fuel-efficient than the previous one.
The Pit Kiln is mainly used to glaze bricks. The amount of heat and the efficiency of it are not enough to work with alloys as a brick kiln can; however, it can effectively be used to glaze all kinds of earthenware and stoneware like urns, pots, vases, and crucibles. To build and operate a Pit Kiln you will need a Pit Kiln, a block of Hay Bale, and three Logs. First, dig a pit (1x1 hole) in the ground, place your Pit Kiln at the bottom and your ingredient on the top. A Pit Kiln must be covered at all times on the bottom and all four sides by solid, non-flammable material; the top is left exposed.
Next, add a Hay Bale, three Logs on top, and use a fire-starting device to ignite. Unlike a Pit Burn, a Pit Kiln is left uncovered on top while it burns.
TIP: Keep in mind that the "Hay Bale" (3x3 crafting of Dried Fibers) has a different recipe from the "Straw Bale" (3x3 crafting of Wheat).
Clay Brick Kiln
Power the kiln by placing Fuel items in the lower half, and then igniting it with a fire-starting device. When you are ready, place your materials to be cooked/smelted into the upper half and wait, as it will take quite a while.
The Clay Brick Kiln has access to all the recipes of the Pit Kiln but is primarily known for being useful to make the most basic alloy, Bronze.
The Refractory Kiln operates exactly the same as the Clay Brick Kiln, but it operates much faster and more efficiently.
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