Method for treating zinc-iron-containing dust and sludge

Abstract

The invention provides a method for treating zinc-iron-containing dust and sludge. The method comprises the following steps of: (1) material preparation, namely performing calculation according to components of different dusts and sludge to ensure that the excess coefficient of free carbon in the materials reaches 1.0 to 1.4; (2) material mixing, namely uniformly mixing the materials and drying natural particle materials or cold bound pellets to be sent to a storage bin for later use; (3) material feeding, namely adding dust and sludge into an empty molten iron tank after molten iron is just poured from the molten iron tank and preheating the dust and sludge materials by using waste heat of the empty molten iron tank; (4) zinc and iron separation, namely recovering zinc-containing smoke by using dust-collection equipment; and (5) material melting, namely further reducing the dust and sludge materials by using high-temperature molten iron in a blast furnace casting process and melting the reduced materials, and mixing the melted materials and blast furnace molten iron to form molten iron for a converter. The zinc-iron-containing dust and sludge can be recovered by using conventional equipment without adding a reducing agent or a catalyst, or needing any special equipment, and has the advantages of convenience and operability, short process, low cost and good effect; and the recovery rate of iron reaches over 90 percent, and the recovery rate of zinc is more than 95 percent.

Description

technical field [0001] The invention belongs to the technical field of iron-containing dust and mud treatment, and in particular relates to a method for treating zinc-containing iron-containing dust and mud. Background technique [0002] Iron-containing dust and mud are inevitable products in the iron and steel production process. They are the general designation of dust and mud with iron as the main component discharged from the dust removal system of various production processes during the iron and steel production process. The dust collected by the dry dust collector and the mud collected by the wet dust collector. The dust and mud produced in the blast furnace smelting process account for 1% to 3% of the molten iron, and the dust and mud produced in the converter and electric furnace steelmaking process account for 1.5% to 4% of the steel output. Among them, zinc-containing iron-containing dust and sludge account for about 10% to 80% of iron-containing dust and sludge. ...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of high energy consumption and power consumption, special equipment, long treatment process and complicated process in the prior art to deal with zinc-containing and iron-containing dust and sludge, and to provide a method for treating zinc-containing and iron-containing dust by using equipment waste heat and molten iron heat. Separation and recovery treatment method of iron dust sludge

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