Amphibole type primary iron ore grading process

Abstract

The invention relates to an amphibole type primary iron ore grading process. The amphibole type primary iron ore grading process comprises the steps that iron ore with iron mineral disseminated grainsize being P80=17 microns is subject to rough breaking and primary dry in-advance magnetic separation, primary dry in-advance magnetic separation concentrate with the grade being 28.62%, the recoveryrate being 98.51% and the particle size being P80=150 microns serves as raw materials; the process is characterized in that raw ore is subject to semi-automatic-grinding screening closed loop grinding, wet in-advance magnetic separation, two-stage stage grinding stage low intensity magnetic separation, one-roughing one-refined three-scavenging reverse flotation, three-stage closed loop superfine ore grinding and strong magnetic separation process grading, wherein the semi-automatic-grinding screening closed loop grinding product granularity is 0 mm-3 mm, the two-stage closed loop grinding product granularity is P80=30 microns, the three-stage closed loop grinding product granularity is P80=17 microns, and the good indexes with the final iron ore concentrate iron grade being 65.50%, the recovering rate being 76.00%, the comprehensive gangue iron grade being 11.30% and the recovery rate being 24.00% are finally obtained.

Description

technical field [0001] The invention belongs to the technical field of iron ore beneficiation, in particular to an amphibole-type primary iron ore separation process. Background technique [0002] As an important type of primary ore, amphibole-type primary ore is widely distributed in my country. The grade of amphibole-type primary ore in my country is generally low, and the embedded particle size is very fine. The embedded particle size of iron minerals in amphibole-type primary ore is generally P80<20 microns. Even if the iron minerals are dissociated, it is difficult to recover effectively by ordinary magnetic separation. For example, the iron mine in Yuanjiacun, Shanxi, my country There are abundant amphibole-type primary iron ores, because the embedded particle size of the iron minerals is only P80=17 microns, which cannot be effectively recovered, and have not been used for decades since the discovery of the deposits. Therefore, it is necessary to develop a benefic...

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Problems solved by technology

The embedded particle size of iron minerals in amphibole-type primary ore is generally P80<20 microns. Even if the iron minerals are dissociated, it is difficult to recover effectively by ordinary magnetic separation. For example, the iron mine in Yuanjiacun, Shanxi, my country There are abundant amphibole-type primary iron ores, because the embedded particle size of the iron minerals is only P80=17 microns, which cannot be effectively recovered, and has not been used for decades since the discovery of the deposits.

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