Typical beneficiation process of hematite

The hematite beneficiation process is suitable for the characteristics of hematite and impurities embedded in it and uneven particle size, including a small amount of magnetite, hematite, gangue minerals containing quartz, kaolin and other complex ores.

At present, the typical beneficiation processes of hematite include continuous grinding-weak magnetism-strong magnetism-anion reverse flotation, graded grinding-coarse and fine separation-gravity-magnetic force-anion reverse flotation and graded grinding-coarse and fine separation-magnetic force-three kind. Gravity-anion reverse flotation.

1. Continuous ball milling-weak magnetism-strong magnetism-anion reverse flotation,

Main features of this process:

(1) It has good adaptability to the mineralogical characteristics of iron ore technology. In view of the characteristics of fine particle size and high requirements for fine grinding of iron ore, the continuous ball milling method is used to grind almost all the ore free and then sort it.

(2) The combined utilization of weak magnetism-strong magnetism-anion reverse flotation realizes the optimized combination of process flow. After continuous grinding, use weak magnetic separator-strong magnetic separator to discharge primary slime and secondary slime. Feeding anion into reverse flotation can improve the iron grade, which is beneficial to obtain high-quality refined iron through anion reverse flotation. More importantly, the weak magnetic separator-strong magnetic separator removes primary slime and secondary slime, creating good process conditions for anion reverse flotation to better play its role.

(3) This process is easy to obtain better mineral processing indicators. At present, strong magnetic equipment is the ideal hematite tailings waste equipment, and anion reverse flotation is the most ideal process to obtain high-grade refined iron from hematite.

2. Classification grinding-coarse and fine separation-gravity-magnetic force-anion reverse flotation

The characteristics of this process are: after the raw ore is ground once, it is classified by a cyclone, and then coarse particles and fine particles are processed separately. For coarse particles, a spiral chute is used for gravity separation to obtain qualified coarse concentrate. For fine particles, weak magnetic-strong magnetic-reverse flotation separation is used to ensure good mineral processing indicators and high-quality fine concentrates. The ore is re-centered for secondary grinding and then returned to the cyclone for classification. The concentrate particle size of this system is mainly gravity separation coarse concentrate, and the amount of alkaline fine concentrate obtained by reverse flotation is very small, unlike continuous grinding-weak magnetism-strong magnetism-anion reverse flotation, which can easily cause filtration difficulties.

(1) Adopt graded grinding process. After primary grinding, the preparation of coarse-grained raw ore is achieved, which greatly reduces the production capacity of secondary grinding. It is good for reducing costs. At the same time, coarse and concentrated iron ore is beneficial to filtration.

(2) Highly selective and targeted. Dissociation during grinding is random. Dissociated ore after coarse grinding should be selected. This process uses a spiral chute to gravity-separate the ionized coarse iron ore, and then uses an efficient and complex strong magnetic negative ion reverse flotation process to obtain the concentrate and discharge the tailings. The combination of coarse-grained mineral processing and fine-grained mineral processing makes the process economical and advanced.

(3) Achieve narrow-specification feed selection. When beneficiating minerals, the degree of selectivity of ore is related to the characteristics of the ore itself and also to the ratio of particle surface area to volume. The beneficiation process that realizes narrow particle size feed selection can largely eliminate chaos in the flotation process and improve the beneficiation efficiency.

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