The invention discloses a device for recycling
waste heat and dust of metallic
copper smelting flue gas, and belongs to methods for utilizing
waste heat and treating
waste gas. A device for recycling the
waste heat and a device for recycling the dust comprise a countercurrent heat-exchange waste heat boiler A, a
silicon nitride porous
ceramic filter, a countercurrent heat-exchange waste heat boiler B, a preheater for working media of the countercurrent heat-exchange waste heat boilers, a plate channel gas countercurrent
heat exchanger, a
bag filter collector and an induced draft fan which are connected with one another by pipelines or
pipe fittings. The
flue gas is desulfurized in a
sulfuric acid workshop after the waste heat and the dust of the
flue gas are recycled, and then
tail gas meets standards and is exhausted. A method for recycling the waste heat and the dust of the metallic
copper smelting flue gas includes steps of recycling waste heat at a first level; filtering high-temperature
flue gas, removing dust of the high-temperature
flue gas and purifying the high-temperature flue gas; recycling waste heat at a second level; recycling waste heat a third level; recycling waste heat at a fourth level; filtering low-temperature flue gas and removing dust of the low-temperature flue gas; feeding the filtered flue gas into the
sulfuric acid workshop after the dust of the flue gas is removed, and desulfurizing the flue gas; enabling the
tail gas to meet the standards and exhausting the
tail gas. The device for recycling the waste heat and the dust of the metallic
copper smelting flue gas has the advantages of high waste heat recycling efficiency, completeness in dust recycling, simplicity and convenience
in process control and low recycling cost.