Method for separating blended iron oxide from iron powder

Abstract

The invention provides a method for separating blended iron oxide from iron powder. The method comprises the steps that the iron powder with the grain size ranging from 0.075 mm to 1 mm is taken; the above iron powder is sorted, particles with the grain size larger than 0.42 mm and particles with the grain size smaller than 0.075 mm are removed, and a material I is obtained; the material I is subjected to winnowing type grinding treatment, and a material II is obtained; the material II is sorted, particles with the grain size smaller than 0.075 mm are removed, and a material III is obtained; and the material III is subjected to two-level dry method magnetic separation, and the iron powder is obtained. The iron oxide contained in the particles with the grain size ranging from 0.042 mm to 0.075 mm in the iron powder is separated out, only the iron powder is left (or a small amount of iron oxide is contained, and the requirement can be met as long as the grade reaches MFe88%), the grade can reach MFe88% or above accordingly, the yield is increased, and the iron powder production cost is reduced. The steps are simple, operation is convenient, and practicability is high.

Description

technical field [0001] The invention belongs to the technical field of powder crushing, in particular to a method for separating mixed iron oxide from iron powder. Background technique [0002] The quality of the iron powder used as a reducing agent requires a particle size between 0.42 mm and 0.075 mm, and a grade of MFe (elemental iron) ≥ 88%. The iron powder used as a reducing agent is produced by using coarse granular sludge from steelmaking. The coarse granular sludge is passed through three Magnetic separation, two-stage ball milling, water washing, drying and other processes produce iron powder with a particle size ranging from 1mm to 0.058mm and a grade of MFe70%, among which the iron powder with a particle size between 0.42mm and 0.125mm contains only A small amount of iron oxide particles and iron oxide powder adhering to the surface of iron powder, but the grade has met the quality requirement of MFe≥88%. At present, this part of iron powder can only be collected ...

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN2007101688837 discloses a method for purifying iron powder from steelmaking sludge coarse particles, but the iron powder produced by this method can only be collected to 0.096 mm, and the iron powder below 0.096 mm has more iron oxide impurities, resulting in lower grades. Low, only particles below 0.096 mm can be discarded, the yield of the product is low and the cost of energy consumption is high

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