Primitive Technology: Pit and chimney furnace

Demolition of the old furnace Dig a deep pit The furnace is built below the ground, about 25 cm square Furnace grid Flue Furnace door brick Building a chimney 2 meter high chimney Burning charcoal Unburned charcoal wood can be left for the next treatment Available charcoal (higher burning temperature than ordinary wood) Iron bacteria Burning grass ash (reducing the melting point of iron ore) Mix iron ore, charcoal powder and grass ash into a cylindrical block Slag falls through the grate Remove the molten cylindrical block Granular pig iron Granular pig iron You can see the rust and prove that it is indeed iron.

Furnace with deep pit and chimney .

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