Method for reclaiming zinc-iron-containing dust and sludge

Abstract

The invention provides a method for reclaiming 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 and drying the materials to be sent to a storage bin for later use; (3) material feeding, namely continuously and uniformly adding dust and sludge from the storage bin into molten iron flow from a main molten iron trough and other positions through feed equipment according to determined weight by calculation, and reducing ferric oxide and zinc oxide in the dust and sludge by using heat of high-temperature molten iron; and (4) zinc and iron separation, namely recovering zinc-containing smoke by using dust-collection equipment of a casting house to obtain a zinc oxide product or zinc oxide enriched dust so as to realize zinc and iron separation. 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 recycling iron-containing dust and mud, 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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