Stage of iron ore beneficiation

Disseminated iron ore beneficiation process is a combination of metallic and non-metallic minerals and mineral dissociation sorting process.
The sequence of dissociation and enrichment of various minerals is as follows: dissociation→enrichment→dissociation→enrichment. The number of such process selection combinations determines the stage of the beneficiation process. The rest of the operations have an auxiliary meaning and serve to ensure the normal function of the main process.
The purpose of the application phase beneficiation process is to periodically discharge qualified products in the form of metallic minerals or non-metallic minerals as the mineral dissociates. This saves on the cost of the beneficiation because the amount of material that needs to be reprocessed in the next few segments is reduced. What is dealt with in the next few paragraphs is the continuous body of gangue-ore. Since the existing classification and sorting methods cannot (or are expensive) to discharge the dissociated metal ore particles from the process, the dissociated metal ore particles also enter the next stages in the form of material balance with the continuum. Therefore, when the influence of the stage on the beneficiation index of magnetite quartzite is taken as the research object, it is more feasible to use non-metallic ore materials with less over-grinding. When using the stage beneficiation method, the condition of non-metallic ore materials is easy to pass through the direct quantity. Measurement and quality evaluation were conducted for experimental research.
The grinding time obtained in Chapter 2 affects the relationship between the dissociation degree and the amount of newly formed non-metallic ore material. When the amount of grinding is constant, it is correct for a grinding process. In the multi-stage beneficiation method, the non-metallic ore particles which are mainly dissociated after each section are discharged from the process, and the original ore supply of the grinding machine is reduced by section or by non-metallic ore material. . Considering this situation, the original ore amount (Q _L ) of each section of the multi-stage beneficiation process is: [next]

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The equations listed above are correct under the conditions that the magnetic separation is not more than 15 to 20 times or in the multi-stage selection of magnetic separation on a magnetic field that can ensure that the symbiotic body is substantially fully recovered into the magnetic product.
In terms of practical magnet mineral quartz rock, are representative of these conditions, because modern process concentrator segment does not exceed 4-5 dressing, comprising a (110 to 120 kA / m) was performed on a variety of magnetic field No more than 15 magnetic separations can virtually eliminate the loss of metal in the ore.
The effects of periodicity on the selection of magnetite quartzite were verified in laboratory, semi-industrial and industrial conditions. At the previous tests conducted in the laboratory, the final grinding particle size was the same.
The results of laboratory tests using magnetite quartzite in various different beneficiation stages are shown in the figure.

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The data calculated according to equations (4) and (5) and the laboratory test results show that, in all cases, the selection stage increases the concentrate iron grade, because the average percentage of connected organisms in the ground material follows The number of segments increases and increases. The effect of the number of segments on various types of ore beneficiation indicators is different and depends on the grain size and nature of the metal minerals and non-metallic minerals. The number of selected segments has the greatest impact on very finely embedded ore and lean ore. For the latter two types of ore, the characteristic is that the iron grade is significantly improved with the increase of the number of selected sections. For the coarse-grained and medium-grained ore, a nearly sloping, nearly parallel curve was obtained, which proves that the effects of the two types of ore on the quality of the concentrate are the same. In the general case, for all types of magnetite quartzite of the type studied, the concentrate iron grade increases as the sorting phase increases. This increase is dependent on improving the monomer separation process of the material, increasing the magnetic separation time, and continually reducing the amount of material that is reprocessed in the next few stages. The growth rate of concentrate grade is found to be the highest in the 3~4 section. Although the relationship curve obtained by the study has no maximum value within the range shown in the above figure, the further improvement of the concentrate iron grade is slowed down as the number of segments increases.

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