Method for preparing iron powder and recovering nonferrous metal from blast furnace iron making smoke dust

Abstract

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.

Description

technical field [0001] The invention relates to a combined treatment method of metallurgy and ore dressing, in particular to a method for producing iron powder and recovering nonferrous metals from blast furnace ironmaking fumes. Background technique [0002] Iron powder includes metallurgical iron powder and chemical reduced iron powder. The former is mainly used in powder metallurgy, and the latter is mainly used in chemical industry, nonferrous metallurgy and water treatment industries. The industrial manufacturing methods of iron powder are generally iron oxide reduction iron powder and molten steel atomized iron powder. Domestic production of iron powder generally uses rolled steel scale as raw material, while foreign production of iron powder generally uses super iron powder ore as raw material. The iron powder produced by these raw materials and methods has high cost, equipment investment, large production site, and certain environmental protection problems. [0003...

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Problems solved by technology

However, whether the production of iron powder that meets the requirements of the industry with blast furnace ironmaking dust can be successful, and what kind of difficulties will be encountered are unpredictable, and there are no previous reports

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