Cyclical low-carbon metallurgical method with tail gas conversion by plasma

The invention relates to a cyclical low-carbon metallurgical method with tail gas conversion by plasma. The method comprises the following steps: cracking carbon dioxide and high temperature water vapor in tail gases to turn back to carbon monoxide and hydrogen by a plasma generator; separating smelting furnace tail gases through a tail gas separator; exchanging heat with coal dust and various mineral aggregates for reducing gases by one part of the smelting furnace tail gases and recycling the part; converting the other part of the smelting furnace tail gases to prepare new reducing gases bya tail gas cracking convertor; blowing the mineral aggregates into a flash furnace by the new reducing gases and smelting; obtaining molten iron through rapid melting by a melting furnace; and carrying out combined cycle generation through hot water in a cooler. Not only the cyclic utilization of the tail gases is realized, the combined smelting intensity and the heat efficiency are improved, andthe production cost and the pure energy consumption are reduced, more importantly the carbon dioxide discharge is reduced, the dependence of the original blast furnace iron making industry on metallurgical coke is overcome, and purposes of environmental protection, low carbon and energy saving are achieved, so the method is an epochal revolution to the metallurgical technology.