The invention relates to a method for preparing
iron powder and recovering
nonferrous metal from
blast furnace iron making
smoke dust. The method comprises steps as follows: the
blast furnace iron making
smoke dust is mixed with
reducing agent fuel; the mixture is added into a
rotary kiln for high temperature reduction reaction, so that
nonferrous metal therein is enabled to volatilize into the
smoke dust; the smoke dust is collected and used for extracting the
nonferrous metal, while iron is reduced to metallic iron which is discharged along with
kiln slag; the
kiln slag is cooled, crushed, and ground to form ore pulp with the particle size smaller than 100 meshes, and
iron ore concentrate with
Fe content more than 65% is magnetic-separated; the
iron ore concentrate is subjected to second stage
grinding, and then metallic
iron powder and secondary iron concentrate are separated on a table
concentrator; metallic
iron powder is dried to obtain commodity reduction iron
powder, with particle size smaller than 120 meshes, MFe more than or equal to 85% and TFe more than or equal to 92%; and further, reduced metallic iron
powder is reduced by a
hydrogen reduction electric furnace and then is discharged, ground and screened to produce commodity metallic iron
powder with MFe more than or equal to 98%. The method has simple technology, is mature and reliable, is simple and convenient to operate and low in cost, is high in
product value and excellent in comprehensive utilization, has wide
population and application values, and provides a new
route for
solid waste recycling utilization and low cost iron powder preparation.