Separation technology for hematite containing iron carbonate

Abstract

The invention relates to a separation technology for hematite containing iron carbonate. The separation technology comprises the step that iron ores with the hematite distribution rate being higher than 40% are fed into first-stage closed circuit grinding operation. The separation technology is characterized by further comprises the steps of first-stage weak-magnetic and strong-magnetic operation,thickness grading operation, gravity separation operation, secondary-grading grinding operation, second-stage weak-magnetic and strong-magnetic operation and reverse flotation operation, wherein primary-grading overflow products and middling regrinding products are treated through first-stage weak-magnetic and strong-magnetic operation, first-stage weak-magnetic and strong-magnetic mixed concentrates are treated through thickness grading operation, coarse grain products subjected to thickness grading operation are treated through gravity separation operation, gravity separation operation tailings are treated through secondary-grading grinding operation, fine grain products subjected to thickness grading operation are treated through second-stage weak-magnetic and strong-magnetic operation, second-stage weak-magnetic and strong-magnetic mixed concentrates are treated through reverse flotation operation, and reverse flotation operation middlings are treated through table separation operation. The separation technology has the advantages that first-stage strong magnetic tailing discarding after rough grinding is enhanced, the middling circulation volume is decreased, the technological process is simplified, and the production cost is saved.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a sorting process for hematite ore 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-grained product is sorted through two-sta...

AI Technical Summary

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

Images