Small-scale lean hematite separation technology

Abstract

The invention relates to a small-scale lean hematite separation technology. The small-scale lean hematite separation technology comprises the following steps of feeding raw hematite into a primary ball mill and a primary grading cyclone, carrying out closed circuit grinding, feeding the ground hematite into a secondary grading cyclone, feeding sand sediment obtained by the secondary grading cyclone into a roughing spiral chute, feeding concentrate obtained by the roughing spiral chute into a concentration spiral chute to obtain concentrate as qualified concentrate, merging tailings obtained by the roughing spiral chute and the concentration spiral chute, feeding the merged tailings into a tertiary grading cyclone, merging overflows obtained by the tertiary grading cyclone and the secondary grading cyclone, feeding the merged overflows into a primary weak magnetic separator, concentrating tailings obtained by the primary weak magnetic separator by a primary concentration large-well, feeding the concentrated tailings into a strong magnetic separator, discarding tailings obtained by the strong magnetic separator, merging concentrate obtained by the strong magnetic separator and the primary weak magnetic separator, feeding the merged concentrate into a secondary concentration large-well, carrying out concentration, feeding concentrate obtained by the secondary concentration large-well into a centrifugal machine, feeding concentrate obtained by the centrifugal machine into a table concentrator to obtain concentrate as qualified concentrate, feeding back middlings obtained by the table concentrator to the centrifugal machine, merging tailings obtained by the table concentrator and the centrifugal machine, feeding the merged tailings to a secondary weak magnetic separator to obtain concentrate as qualified concentrate, and discarding tailings obtained by the secondary weak magnetic separator. The small-scale lean hematite separation technology has simple processes and low energy consumption, is economic and environmentally friendly and improves a resource utilization rate.

Description

technical field [0001] The invention belongs to the technical field of beneficiation technology, in particular to a small-scale separation technology of lean hematite. Background technique [0002] At present, Anshan-style lean hematite beneficiation basically adopts the process of stage grinding, coarse and fine separation, gravity separation-strong magnetic field-anion reverse flotation. Stage grinding can reduce ore over-grinding, strong magnetic operation can improve fine-grained iron ore, gravity separation (spiral chute) can obtain coarse-grained iron concentrate, and reverse flotation process is suitable for sorting fine-grained products to obtain high-grade fine-grained concentrate. Separation of lean hematite ore by gravity-maglev combined process has been successfully applied in large-scale mining enterprises. However, due to the influence of unfavorable factors such as large investment, complex process structure, difficult operation, high energy consumption for ...

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Problems solved by technology

However, due to the influence of unfavorable factors such as large investment, complex process structure, difficult operation, high energy consumption for heating pulp, and environmental protection requirements for water purification, it is not suitable for small-scale production.

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