Magnetic-gravity separation method for magnetic-hematite mixed iron ore

Abstract

The invention discloses a magnetic-gravity separation method for magnetic-hematite mixed iron ore. The method includes the following steps of: performing primary grinding on the magnetic-hematite mixed iron ore, and performing weak magnetic rough separation-weak magnetic fine separation on a primary grinding product to obtain a weak magnetic separation iron concentrate; performing primary strong magnetic separation on weak magnetic rough separation tailings; combining a primary strong magnetic separation concentrate and the weak magnetic fine separation tailings, and then performing spiral chute gravity separation to obtain a spiral chute gravity separation iron concentrate; performing secondary grinding on spiral chute gravity separation tailings, and performing secondary strong magneticseparation on a secondary grinding product to obtain a secondary strong magnetic separation iron concentrate; carrying out grinding-secondary strong magnetic separation on the gravity separation tailings; sieving and grading the primary strong magnetic separation tailings to obtain medium and fine sand products for construction, and discharging the sieved and graded fine tailings T1; and combiningthe secondary strong magnetic separation tailings and the sieved and graded fine tailings, and then performing tertiary strong magnetic separation to select an iron correcting agent for producing cement raw materials. The scheme of the invention has the advantages that the recovery rate of the iron concentrate is high, the secondary regrinding amount is small, energy conservation and consumptionreduction can be facilitated, environmental friendliness and simple process flow structures are realized, the water yield of the tailings is small, the index is stable, the field operation and management can be facilitated, and the like.

Description

technical field [0001] The invention belongs to the iron ore beneficiation process, in particular to the separation method of magnetic-red mixed iron ore, which is especially suitable for the ratio of TFe between 34.0% and 42.0%, and the ratio of magnetite to red (brown) iron ore at 1.2. Between ~2.0, SiO in gangue minerals 2 A magnetic gravity separation purification method for magnetic-erythroic mixed iron ore with a content ≥ 85%. Background technique [0002] Common magnetic-red mixed iron ore beneficiation process mainly adopts stage grinding-weak magnetic field-strong magnetic field-anion reverse flotation; stage grinding, coarse and fine separation, gravity separation-magnetic separation-anion reverse flotation; stage grinding Mining, coarse and fine separation, magnetic separation-gravity separation-anion reverse flotation process. [0003] It can be seen that anion reverse flotation is almost indispensable in the existing magnetic-erythroic mixed iron ore benefici...

AI Technical Summary

Problems solved by technology

The beneficiation technical indicators obtained by the above beneficiation process have improved compared with those before optimization, but there are still problems such as fine grinding particle size, long process flow, high energy consumption, need to add a large amount of flotation reagents, and low iron recovery rate.

[0004] The flotation process needs to add beneficiation agents - collectors, inhibitors, foaming agents, pH regulators, etc., which not only pollute the environment, but also cause harm to the health of workers

Therefore, when domestic enterprises "go out" to develop and utilize foreign mineral resources, due to the strict environmental protection requirements of foreign countries, flotation processes are often not allowed to be used to avoid the pollution of the local environment by adding flotation agents, leading domestic enterprises to foreign magnetic- The development and utilization of red mixed iron ore resources are restricted

[0005] In addition, in the process of iron ore beneficiation, a large amount of tailings need to be discharged, and a large amount of tailings are piled in the tailings pond, which not only causes waste of resources, but also causes pollution and harm to the environment, and the tailings pond occupies a large area, and the production and operation high cost

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