What is pseudo hematite and what is its beneficiation method?

Pseudo-hematite is a mineral phase between magnetite and hematite, which is formed by oxidative metasomatization of magnetite, which retains the magnetic properties of magnetite, but the optical characteristics are closer to that of hematite. The beneficiation method is magnetic separation, and it stands to reason that weak magnetic separation can solve the problem, but because the ore must contain hematite, strong magnetic separation will also be applied in the beneficiation process.

Hematite and mirror iron ore are generally dominated by magnetic separation, of course, this can only be determined according to the specific raw ore analysis.

Even if they are all hematite beneficiation, their mineral content is different, and their beneficiation methods are also different.

In nature, magnetite (Fe3O4) and hematite can be converted into each other and can reach equilibrium under certain conditions. When the concentration of oxygen increases, magnetite can be oxidized into hematite tanxingqi. If the crystal form of the original magnetite is still retained, it is called pseudo-hematite. Sometimes magnetite is only partially converted into hematite, which is called pseudohematite.

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Magnetite The main iron-bearing mineral is magnetite, and its chemical formula is Fe3O4, in which FeO=31%, Fe2O3=69%, and the theoretical iron content is. This ore sometimes contains a combination of TiO2 and V2O5 composite ores, and hail is called titanomagnetite or alum titanomagnetite respectively. In natural pure magnetite ore, it is rare to meet friends, and often due to surface oxidation, part of the magnetite is oxidized into semi-pseudo-hematite and pseudo-hematite.

The so-called pseudo-hematite is that magnetite (Fe3O4) is oxidized into hematite (Fe2O3), but it still retains the shape of the original magnetite, so it is called pseudo-hematite.

Magnetite has strong magnetism, the crystals are often octahedral, and a few bright sails are diamond-shaped dodecahedrons. The aggregate is often dense and block-like, the color streaks are iron-black, semi-metallic luster, relative density, hardness, no cleavage, and the gangue is mainly quartz and silicate. The reduction is poor, and it generally contains high levels of harmful impurities such as sulfur and phosphorus.

Hematite, also known as red squirting ore, has a chemical formula of Fe2O3, which is a weakly magnetic iron mineral, which has better floatability than magnetite and is one of the main raw materials for ironmaking. The main beneficiation processes of Hengjube include gravity separation, flotation and strong magnetic separation, or a combination of various beneficiation processes, as well as weak magnetic separation after magnetization and roasting.

In the early days, hematite beneficiation generally used gravity separation technology, mainly including jigs, centrifugal separators, spiral chutes, spiral concentrators, shakers, etc., which were gradually eliminated due to their small beneficiation processing capacity, low beneficiation grade and low rate.

Later, hematite beneficiation developed flotation technology and strong magnetic separation process, mainly using paraffin oxide wax soap as the collector of positive flotation process and electromagnetic flat ring strong magnetic separator as the separation equipment. However, none of the technical indicators for its selection have achieved satisfactory results.

In recent years, the beneficiation of hematite has made great progress, and its main beneficiation process is the strong magnetic beneficiation process represented by the electromagnetic pulsating high-gradient magnetic separator and the reverse flotation beneficiation process represented by the series. In particular, the use of strong magnetic-flotation combined process has enabled the hematite separation of some mines to achieve the satisfactory index of iron concentrate grade and iron concentrate rate.

It can be said that China's red ore (hematite) research work since the "Sixth Five-Year Plan" has basically achieved the expected goal, and the technical problems of red ore beneficiation have been basically solved.

Pure hematite contains 70% iron, pure magnetite contains iron, and only turning into magnetite cannot achieve the purpose of increasing iron content.

The so-called 45% hematite, if the form of oolitic inlay, can only be increased to 52% by direct grinding-strong magnetic separation; However, under the condition of coaling or CO, it can be turned into magnetite by reducing roasting at a high temperature of 700 850 degrees of bright pei, which must also be ground to 500 mesh, and then selected three times with a weak magnetic machine, more than 55% or even 60% of the iron concentrate can be obtained.

The 45% hematite of the base silver, if it is a non-oolitic embedded form, then the use of grinding-strong magnetic separation-flotation technology can be increased to more than 60%, and the beneficiation of this ore in China is very mature. Jing Fengwei.

First take 45% of the hematite samples to find the beneficiation research unit to check the ore structure and structure, and explore the appropriate beneficiation method.