Process for processing low grade hematite ore

Abstract

The invention belongs to the technical field of preparing low grade hematite ore, in particular to a process for processing a low grade hematite ore. The process comprises the following steps: the ore is ground until monomer separation and then coarse and fine classification is carried out on pulp; coarse grain pulp is subject to reselecting, ferromagnetism and sieving to obtain a part of the concentrate; the fine grain pulp is conveyed to a mixing tank for separating sample, and then is conveyed to a second mixing tank to be mixed with medicine for size mixing; the mixture is pumped to a rough flotation column; the under flows of the rough flotation column is fed to a cleaning flotation column, the under flow of the cleaning flotation column is the ultimate iron ore concentrate; foam of the rough flotation column is conveyed to an one-stage scavenging flotation column by a pump; the under flow of the one-stage scavenging flotation column and the foam of the cleaning flotation column are mixed and return to the rough flotation column, and products of the one-stage scavenging flotation column are final tailings. The process has the beneficial effects of smaller occupation area by replacing a flotation machine with the flotation column, can recycle fine-grade valuable mineral effectively, improve the ultimate concentrate grade, provides reference significance for the mineral separation of the ore of the same type in China, and has obvious economic benefits and social benefits.

Description

technical field

[0001] The invention belongs to the technical field of beneficiation of low-grade hematite ore, in particular to a process for processing low-grade hematite ore. Background technique

[0002] In recent years, in the separation process of hematite, a major technological breakthrough has been made in the grinding-medium-weak strong magnetic-reverse flotation process, which has reached an ideal technology with a concentrate grade of 67.5% and a metal recovery rate of more than 75%. For indicators, the original flotation process is rough and three-sweeping, the process is long, there are many control points, the influencing factors are complex, difficult to control, and the operating cost is high, resulting in a sharp drop in concentrate grade and metal recovery rate. On the one hand, it affects the improvement of the concentrate grade, and on the other hand, it causes the loss of mineral resources. Contents of the invention

[0003] The purpose of the present...

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