Magnetism-weight-flotation combined technology for separating hematite iron ore containing iron carbonate

Abstract

The invention relates to a magnetism-weight-flotation combined technology for separating hematite iron ore containing iron carbonate. The magnetism-weight-flotation combined technology comprises the step that iron ore with the hematite distribution ratio being higher than 40% is fed in to be subjected to first-stage closed circuit grinding operation. The magnetism-weight-flotation combined technology is characterized in that the magnetism-weight-flotation combined technology further comprises the steps of first-stage weak magnet and strong magnet operation, thickness grading operation, gravityseparation operation, secondary staged ore grinding operation, second-stage weak magnet and strong magnet operation and reverse floatation operation; the first-stage weak magnet and strong magnet operation treats a primary grading overflow product and a middling ore re-grinding product; the thickness grading operation treats first-stage weak magnet and strong magnet mixed concentrate; the gravityseparation operation treats a coarse particle product after the thickness grading operation; the secondary staged ore grinding operation treats gravity separation operation tailings; the second-stageweak magnet and strong magnet operation treats a fine grain product after the thickness grading operation; the reverse floatation operation treats second-stage weak magnet and strong magnet mixed concentrate; and centrifuge separation operation treats middling ore after the reverse floatation operation. The magnetism-weight-flotation combined technology has the advantages that the middling circulation volume is reduced, a process flow is simplifies, and the manufacturing cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a combined magnetic-gravity-flotation process for sorting hematite ores containing iron carbonate. Background technique [0002] At present, most ore concentrators that process iron carbonate-containing lean hematite adopt "coarse and fine separation-gravity, magnetic and flotation combined process" or "stage grinding, weak magnetic-strong magnetic-flotation process" for separation, of which flotation Choose to use step-by-step flotation. Among them, the "coarse and fine separation-gravity, magnetic and floating combined process" is a closed-circuit grinding system composed of primary grinding and primary classification after the raw ore is crushed. The primary overflow product has a particle size of -200 mesh and a content of 55% to 60%. After the primary overflow product passes through the coarse and fine-grained cyclone, the coarse-grained and fine-grai...

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Problems solved by technology

The common problem of these two processes is that the flotation process is complicated. After the flotation feeds the ore, the foam and the underflow are subjected to reverse flotation respectively. A total of 8 stages of flotation operations are required, and the cost of flotation operations is relatively high. , in addition, when the content of iron carbonate in the flotation supply fluctuates, the flotation operation is unstable, which greatly increases the production cost of the concentrator

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