Magnetic separation method of high-purity iron powder

Abstract

The invention relates to a magnetic separation method of high-purity iron powder, which comprises the following steps: (1) feeding crude powder with a particle size of 200 microns and a Fe content of 55% into a first magnetic separator through a high frequency sieve, wherein the field intensity of the first magnetic separator is 1600-12000 e, after magnetic separation, feeding the material into a second magnetic separator with a field intensity of 4000-30000 e; (2) after magnetic separation, feeding the material into a third magnetic separator with a field intensity of 5000-60000 e; (3) performing magnetic separation to obtain fine powder with a particle size of 60 microns and a detected Fe content of 66%. The method of the invention realizes recovery in different degrees of iron minerals with different magnetic properties in iron ore through stepwise magnetic separation, effectively improves the magnetic separation depth, improves the ore feeding conditions for subsequent working, reduces the grade of tailing ore metal elements, thus increases the recovery rate of iron element by 2-3%, realizes emission reduction and efficiency improvement, and improves economic benefits.

Description

technical field [0001] The invention belongs to the field of powder metallurgy and relates to magnetic separation of iron powder, in particular to a magnetic separation method for high-purity iron powder. Background technique [0002] One of the most important metal powders in the powder metallurgy industry. Iron powder is used in the largest amount in powder metallurgy production, and its consumption accounts for about 85% of the total consumption of metal powder. The main market of iron powder is the manufacture of mechanical parts, and the amount of iron powder required accounts for about 80% of the total output of iron powder. [0003] Iron ore is processed into ore powder called concentrate powder after crushing, grinding, ore dressing and other processing. Concentrate powder is divided into various concentrate powders according to different beneficiation methods, such as magnetic separation, flotation, gravity separation and other concentrate powders. However, with ...

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Problems solved by technology

However, with the massive consumption of mountain ore resources, the degree of poor and fine hybridization of ores has increased significantly, the conditions for ore supply have become increasingly harsh, the difficulty of magnetic separation has increased, and the grade of tailings has increased. This is due to the fact that the magnetic field gradient of each magnetic separator in the existing process is too small, the depth of magnetic separation is not enough, and the overall configuration of the process is unreasonable