What is pseudohematite and what is its beneficiation method?

The most common iron ores are hematite (English: hematite) and magnetite (English: magnetite), because you will know it naturally after more contact, but you are completely unfamiliar with the imagined hematite. So, after the conversation, I immediately browsed the description of the imaginary hematite in as much detail as possible. Genesis of Pseudohematite: In nature, magnetite (Fe3O4) and hematite (Fe2O3) can be transformed into each other and reach equilibrium under certain conditions. When the oxygen concentration increases, magnetite can be oxidized into hematite; If the crystal form of primary magnetite remains, it is called pseudohematite. Sometimes magnetite is only partially converted into hematite, which is called pseudohematite. When the oxygen concentration decreases, hematite can be reduced to magnetite; If the crystal form of hematite still exists, it is called Moss magnetite. Pseudohematite belongs to weak magnetic minerals. If medium-high intensity magnetic separation is used, gravity separation or reverse flotation may be needed in many cases. The high-intensity magnetic separation plant of Brazil's Kauai concentrator was built in 1972, which deals with felsic (hematite quartz schist) with iron content of 45%-50 10. Before the factory was built, the contrast tests of wet high intensity magnetic separation and reverse flotation with Humphrey spiral concentrator were carried out. The test results show that wet high-intensity magnetic separation has the best effect, because wet high-intensity magnetic separation can discard tailings with 1mm particles and select qualified concentrates, but the flotation must be fine, which leads to a significant increase in mineral processing costs and is not adopted. When Humphrey spiral concentrator is used for gravity separation, it is not used because the feed contains a considerable amount of-150 mesh fine powder, and the separation index is not high. The ore treated by Kauai concentrator is easy-dressing hematite. The ore is crushed into -25mm particles by the timely pulse hematite equipment, then mixed with the simulated hematite equipment, and then fed into the ore feeding bin before magnetic separation. The ore discharged from the feed bin is mixed with water and then sent to Humboldt vibrating screen. The sieve hole at the feeding end is 1 mm, and the ore holding end is 6mm. Particles larger than 6mm can be crushed by a pair of rollers, then returned to screening, or directly sent to the open-air storage yard larger than 6 mm. The particle size yield is 7.3% and the grade is 65. The materials of -LMM ~ OMM are classified by hydrocyclone and divided into three stages:-1mm ~+-0.15m ~+-0.02mm, -0. 15m ~+0.02mm and-0.02mm. The first two stages are controlled before magnetic separation. The screened products enter Jones high-intensity magnetic separator for sorting. Abandoning -0.02mm slime, the magnetic separation concentrate yield is 65%, the grade is 68%, and the total recovery rate of coarse and fine iron is 89%. The total recovery rate of the whole plant is 78%, and the iron content of magnetic separation tailings is 8% ~ 10%. In magnetic separation, the mineral yield is 1O% and the grade is 48%, so it will be re-selected. Reverse flotation, pseudo hematite, pseudo hematite dressing equipment, silicate hematite equipment and hematite process, magnetization roasting flotation and reverse flotation are the key technologies of this patent, which mainly include two key technologies: reagent system and process design. The reagent system of reverse flotation is as follows: sodium carbonate and sodium silicate are used as dispersion regulators, starch is used as hematite inhibitor, and mixed collectors of oleic acid and amines are used to flotation silicate minerals. The flotation process is: one roughing, three scavenging and tailing discarding, six cleaning and coarse underflow, and the first three cleaning and tailing discarding. In this way, using the twice tail-throwing technology can reduce the return pressure of the process, solve the problem that the flotation of oxidized ore can not return smoothly because of the large amount of foam, and make the process go smoothly. After many consultations, I basically have a deep understanding of the imagined hematite, so I will not be stretched to communicate with foreign customers.