A bloomery is an invention used in the middle ages. To get wrought iron from sand and other chemicals, the way a bloomery would work is they would have to burn charcoal, then add the sand then add more charcoal. This part of the process goes for about 4-7 hours.
When the bloomery process is nearly finished, they would either break a hole in the bottom or unplug a plug.
Once unplugged, a stream of molten iron and slag pours out. What comes out is called the bloom. Once the bloom is hardened, they pick it up with tongs, and they will reheat the bloom for about one minute in a furnace to a very high temperature without remelting it. Once it is hot enough, they move the reheated bloom onto an anvil and hammer off any slag. Once they have finished hammering the bloom, the bloom has now become wrought iron. They can now use the wrought iron to turn it into any tool they want.