In Soviet ore sorting magnet substantially only magnetic separation method: dry and wet magnetic separation with magnetic desliming. Only the Olenegorsk mining company adopts a joint (magnetic separation-re-election) process.
The magnet quartzite is selected in two, three, four or five stages by different types of cylindrical magnetic separators. The IIBM-90/250 and IIBM-120/300 cylinder magnetic separators with countercurrent bottom and semi-counterflow bottom grooves and the IIBM-150/400 cylindrical magnetic separator have been the most widely used.
For a selection, a downstream tank or a counter-current tank magnetic separator is used. The second-stage selection uses a counter-current bottom-slot magnetic separator, while the third, fourth and fifth-stage selections use a semi-counter-flow bottom-slot magnetic separator. The magnetic field strength of each segment is the same, and the magnetic field strength of the cylinder surface is between 90 and 110 kA/m.
Magnetite beneficiation process of the same type, and use stage separation, part of the non-metallic ore tailings successively isolated. This is a feature of the magnetite ore dressing process, because when sorting most useful minerals, the metal minerals can be separated into qualified products one by one with the dissociation of the minerals. The reverse ore dressing method of magnetite ore has requirements for the rationality of the dry process, and the first is to determine the grain size of the stage in determining the tailings yield in each beneficiation stage. The number of times the purity of the magnetic product determined to be non-metallic mineral content has an important effect on the dry tailings yield. Eliminating the depletion of magnetic products as dissociated non-metallic minerals is still one of the most important potentials for improving concentrate quality. To the British occupation of different grinding methods listed Heights mining company with a magnet for example quartz rocks and skarn magnetite ore, magnesium ore magnetic ball mill, and the results are ground ore magnetic separation is not always satisfactory The selectivity for separation in the first beneficiation stage is particularly low. The magnetic products in these beneficiation sections contain 17 to 25% dissociated gangue. In the future, the content of gangue dissociated in the magnetic products of each ore dressing section is reduced, but even the gangue content dissociated in the concentrate is also 2 to 6%. In general, the regularity of the gangue recovery rate of dissociated magnetic products in magnetic products has been confirmed by the production practices of some concentrators for magnetic separators of various structures. It should be noted that the gangue that has not been removed in the concentrate is a great potential for improving the quality of the magnet concentrate. Therefore, a more complete magnetic separation process and a modified magnetic separator structure should be employed in each segment to significantly improve the selectivity of the co-separation.
In the one-stage and two-stage beneficiation, the content of the magnetic part in the tailings does not exceed 1.5 to 5%, and does not exceed 8% in the subsequent sections. The iron content ranges from 25 to 30% to 60-62%. In these products, magnetite is mainly present in the continuous body of fine-grained inlays. It is easy to obtain higher quality concentrates by separating these continuums from the process. The magnetic separation efficiency of recovering magnetite into the concentrate is quite high. The magnetic iron recovery rate of the concentrate in the magnetic separation stage is 98 to 99%. The magnetic iron content in the tailings is not more than 2%, only when the amount of tailings separated during the final stage of sorting very fine grinding minerals is small ((2~5%), the magnetic iron content is increased to 5~7% The production capacity per unit length of the magnetic separator is related to the particle size of the selected material. For coarse materials, the production capacity is 15-40 tons/(mÂ·hr); for fine grinding materials, the production capacity is 6-10 tons/(mÂ·Â· When the JIBM-1200/3000 magnetic separator with the new structure was developed, when the material with the content of -0.074 mm was 60% and 97%, the production capacity per unit length was increased to 40-70 tons/( MÂ·Â·) and 15 to 25 tons/(mÂ·h). The number of magnetic separation segments represents the characteristics of the magnetic separation process. In all magnetic separation plants, the magnetite quartzite beneficiation process has at least three wet magnetic separation sections. The reduction in the size of mineral and non-metallic mineral inlays and the increase in the grade of concentrate irons have also led to an increase in the number of magnetic separations. For example, the most fine-grained ore of the Ingilez mining company and the Mikhailov mining company uses five The segment process is sorted. The South Mining and Selection Company No. 1 Concentrator and the Krivo Rog Central Central Concentration Company are also selected. This process treats ore with a coarser grain size and produces concentrates with more than 65% iron grade. Due to the large amount of coarse-grained stones in the overflow of the gravel mill, it is impossible to perform two-stage and four-section magnetic flow on the ball mill overflow. Elected, so when ball-free grinding is carried out, the concentrator uses a two-stage or three-stage grinding process.
The experience of the use of magnetic separation in the closed-circuit grinding of the Krivorog Central Selection Company is of a certain significance. This can remove some of the coarse-grained gangue and avoid over-grinding, thus increasing the grade of concentrate iron by 0.1. ~0.2%.
The magnetic separation process of skarn-type magnetite ore, ferromagnetic ore and magnesia magnetite ore differs little from the magnetite quartzite beneficiation process. Due to the good dissociation of metal minerals and non-metallic minerals, the number of sorting stages is relatively small, and the ball mill overflow is less magnetically selected. It should be noted that the Sokolov-Salbyyi selection company has achieved good results in magnetic or demagnetization pretreatment of the sorted products prior to magnetic separation. Magnetic treatment can increase the grade of concentrate iron and reduce the grade of tailings by 0.2%.
Magnetic degumming machines are widely used for pre-magnetic separation of ground ore, and in some concentrating plants, they are also used for pre-dewatering concentration operations. This equipment can increase the concentration of ground materials by 1 to 4 times. Improve the production capacity of magnetic separators and filters. In addition, the magnetic deaer removes the most difficult to remove slime and extremely poor fine-grained inlays from the process. This operation can significantly improve the concentrate iron grade. However, the use of magnetic degumming machines to increase the building capacity of the plant requires an increase in production floor space, thereby increasing infrastructure costs, because the equipment is very cumbersome and has a low unit production capacity. Its unit production capacity is ton/( m.): a period of 2.5 to 7.0; two segments of 0.74 to 4.6; three segments of 1.5 to 2.4; and 2.9 to 4.8 before filtration. The magnetic degumming machine consumes most of the industrial water from the process because its overflow concentration is 0.2-2.2%, and the concentration is increased to 5-12% only when the mud is removed from the mined ore.
When magnetic degumming is carried out, it should be pointed out that the Northern Mining Company (No. 1 Concentrator) has achieved good results with a magnetic deaer for dewatering a section of the grinding classifier. By using this equipment, more than 30% of dissociated gangue and fine-grained impregnated biomass are removed from the process, so that the concentrate iron grade can be increased by 0.05% in the case of a coarse final grain size.
When sorting skarn magnetite, magnetite and titanium when magnesium magnetite, since coarser grinding, the material to be treated less shale particles, the material Desliming job sorting applications than magnetite quartzite Less. Magnetic separators are generally used as deliming equipment in these concentrators. For the fine-grain grinding process, 0.7~1.2% of the sludge can be separated from the sludge, and 18-19% of the ore containing iron (Sokolo lost a Salce selection company), while the concentration is increased by 3-10. %.
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