Closed cavity smelting furnace for non-ferrous metal

The invention provides a closed energy collected nonferrous metal smelting furnace with multi-functions, which relates to the refining and the smelting technical field of the metallic substance; the nonferrous metal smelting furnace is characterized in that combustion walls enclose under the top part of the smelting furnace, and is communicated with a recovery tank, a warm-air pipe connected withthe multi-holes melting zone at the bottom of the furnace is joined with an air inlet pipe, hot blast gallbladders are around the entourage in the centre of the furnace, a pair of temperature increasing electrodes are inserted in the centre opposite the two sides of the furnace bottom, and holes are arranged at the bottom side of the recovery tank; the recovery tank is connected with the bottom ofa washing pool through a pipe, and the clean coal gas is guided out from an outlet on the top to be reclaimed; a heavy metal tapping hole is arranged at the bottom of the smelting furnace. After theinvention is brought to eff