According to the present invention, there is provided a method for recovering carbon, iron, zinc, alkali, and chlorine by recycling a by-product by-product containing at least one of sintered electric dust collector dust, steel sludge, blast furnace dust, Preparing a mixture by mixing water and iron and carbon by-products containing iron, carbon, zinc, chlorine and alkali to dissolve and stir the alkali and chlorine; Supplying an air bubble to said mixture, and recovering carbon particles adhered to said air bubble; Recovering iron from the mixture in which the carbon is removed and the iron and zinc solid are contained, using a magnet having magnetic force of 500 to 1000 gauss, to which iron is attached and not to which zinc is attached; Separating a solution containing alkali ions in the mixture from which carbon and iron are removed, and recovering the solid containing zinc; A step of adsorbing alkali ions dissolved in the solution to a cation exchange resin; a step of desorbing alkali ions adsorbed on the cation exchange resin; a step of adsorbing chloride ions dissolved in the solution to an anion exchange resin; Desorbing the chlorine ions adsorbed on the anion exchange resin, the method comprising: recovering alkali ions and chlorine ions from the solution; .
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