Lean hematite stage grinding and high intensity magnetism, gravity separation, negative ion reverse flotation technique

Abstract

The present invention relates to a lean hematite stage grinding and high intensity magnetism, gravity separation, negative ion reverse flotation technique which includes the following steps of: feeding lean hematite for a first grinding after which a first classification is given; feeding effluence of the first classification under medium intensity magnetism and high intensity magnetism; feeding concentrates into a classification between coarse and fine grits and discarding ore tailings; after the coarse and fine grit classification, feeding the coarse grit products into a coarse snail and fine grit products to concentration; feeding the fine grits from the coarse snail into a fine snail, the fine grits of which are gravity separating fine grits; feeding tailings from the coarse and fine snails into a second classification, the effluence of which goes back to medium intensity magnetism; feeding concentrated underflows into a coarse flotation and discarding the effluents; feeding the fine grits from the coarse flotation into a fine flotation and the tailings into a first sweeping flotation; fine grits from the fine flotation being the fine grits of the flotation and returning the tailings back to the coarse flotation; returning the fine grits from the first sweeping flotation back to the coarse flotation and feeding the tailings into a second sweeping flotation; returning the fine grits from the second sweeping flotation back to the first sweeping flotation and feeding the tailings into a third sweeping flotation; returning the fine grits from the third sweeping flotation back to the second sweeping flotation and discarding the tailings. The technique reduces the work load of the preparation equipment and the cost of mineral separations.

Description

technical field [0001] The invention relates to the technical field of ore dressing, in particular to a lean hematite stage grinding and strong magnetic-gravity separation-anion reverse flotation process. Background technique [0002] At present, my country's lean hematite mostly adopts stage grinding, coarse and fine classification, gravity separation-strong magnetic-anion reverse flotation process, and the primary classification overflow (-200 mesh content 60%) is divided into coarse and fine by coarse and fine classification. product. Coarse-grained part is thrown by weak and medium magnetic after two-stage operation of coarse snail and sweeping snail; the fine-grained part is thrown by medium and strong magnetic. As the selected grade of lean hematite has continued to decline in recent years, it has dropped from 32% to 24%, which increases the load on the mineral processing equipment, thereby also increasing the mineral processing cost. Contents of the invention [00...

AI Technical Summary

Problems solved by technology

Due to the continuous decline in the selected grade of lean hematite in recent years, it has dropped from 3

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