Method for ironmaking by smelting reduction in strir-generated vortex

摘要

The invention relates to a method for ironmaking by smelting reduction in a stir-generated vortex, and belongs to the field of metallurgical technology. The method comprises the following steps: (1) placing pig iron in the induction furnace, and then heating the pig iron to the molten state to form molten iron, and maintaining the molten iron to be greater than or equal to 1450 DEG C; (2) stirring the center of the molten iron to form a vortex with a height-to-diameter ratio of 0.5-2.5, and continuing performing stirring; (3) performing mixing and grinding on an iron-containing mineral, a reducing agent and a slag-forming agent in the mass ratio of the iron-containing mineral to the reducing agent to the slag-forming agent being 1 :(0.1-0.15):(0.25-0.4) to obtain a powder mixture, spraying and blowing the powder mixture to the center of the vortex, performing the reduction reaction, and stopping the stirring after molten iron and molten slags are obtained, wherein waste gas is produced; and (4) discharging the molten iron and the molten slags in a layering manner, and releasing treated waste gas. According to the method, the reduction rate of the iron-containing mineral is greater than or equal to 95.5%, the iron content in molten slags is less than or equal to 0.35% by mass, and the method has the advantages of being simple in process, low in investment, energy-saving, environmental-friendly, low in cost and the like. Therefore, the method has high economic value, the utilization rate of the reducing agent is greatly increased, and the method is an efficient non-blast-furnace iron-making technology.