Lean hematite processing technology

Abstract

The invention belongs to the technical field of lean hematite processing, in particular to a lean hematite processing technology which comprises the steps of stage grinding, coarse-fine separation, coarse fraction gravity separation, fine-fraction magnetic separation and centrifuge beneficiation. The lean hematite processing technology disclosed by the invention adopts centrifuge beneficiation to replace reverse flotation beneficiation in the original technology, so that the whole production technological flow is optimized and becomes shorter, and the loss of fine fraction high-grade hematite particles in tailings is reduced; besides, the technological course is more adaptive to properties of the hematite, so that the influence of over-high content of iron carbonate over reverse flotation in the original technological course is effectively solved; and furthermore, due to the adoption of centrifuge beneficiation, reagents does not need to be used and hematite pulp does not need to be heated, so that expenses of reagents and coal are effectively saved and the hematite processing cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of beneficiation of lean hematite ore, and in particular relates to a beneficiation process of lean hematite ore. Background technique [0002] At present, the common beneficiation process of lean hematite is: stage grinding coarse and fine separation-gravity separation, magnetic separation-anion reverse flotation. Coarse and fine separation of stage grinding includes feeding the raw ore into the ball mill for a ball mill; feeding the primary ball row product obtained from the primary ball mill into the cyclone for a primary classification to obtain an overflow and a sand settling; coarse and fine classification of the overflow , to obtain coarse and fine-grained grit and coarse and fine-grained overflow; return a grit to a ball mill; [0003] Gravity separation includes feeding the coarse and fine-grained grit obtained by stage grinding and coarse-fine separation into the gravity-selection spiral chute for...

AI Technical Summary

Problems solved by technology

When the iron carbonate content in the raw ore is high, the flotation operation cannot be adjusted at all

For example, when the content of iron carbonate in the flotation feed ore at the production site is higher than 2.0%, the amount of foam in the flotation operation is extremely small, and it is often in a state of indistinguishable fine and tail. The grade of the flotation concentrate is between 40-60%, which is seriously Affect beneficiation production;

[0008] Second, the reverse flotation process generally adopts one-stage roughing, one-stage fine selection, and three-stage sweeping processes. The number of sorting stages is large and the process is long;

[0009] Thirdly, the reverse flotation process requires the pulp to be separated at a certain temperature, adding a variety of flotation reagents for separation. The cost of coal and reagents for heating the pulp is very high, which increases the production cost

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