Strong magnetic separation operations in various types of joint processing flow weakly magnetic iron ore, the front portion can be discarded early in the process yields about 30 to 50% of eligible tailings, and to ensure full recovery of weak magnetic iron minerals , thereby improving overall joint process of metal recovery.
(1) Strong magnetic separator for magnetic-heavy process
The Gongchangling Plant has adopted a combined process of weak magnetic-strong magnetic-grading re-election to deal with the second choice of weak magnetic iron ore. Weak magnetic is used as a preparation for strong magnetism, and a coarse concentrate with a yield of about 10 to 20% can be selected for classification and re-election together with strong magnetic concentrate. This section of weak magnetic-strong magnetic operation adapts to the characteristics of large changes in the ratio of ferromagnetic iron ore and weak magnetic iron ore in the original ore, which reduces the impact on the lower sorting operation and makes the whole process stable and straightforward.
The test on the Ñ„500mm flat-ring strong magnetic separator shows that when the field strength is 64kA/m and the slurry concentration is 40-50%, the qualified tailings with the grade of 7.63~8.66% can be discarded; and the field strength is increased to 80kA/m. At the time, the grade of tailings can be reduced to 6.14%; if the field strength is increased to 104kA/m, the decline of tailings grade is not obvious. The industry adopts SHP-2000 type flat ring type strong magnetic separator. The average grade of strong magnetic tailings reaches 10.57%. The SHP-2000 type flat ring type strong magnetic separator is used. When the gap between dielectric plates is 4.2mm, Effectively deal with a graded overflow of the second selection workshop of Gongchangling Constituency, which can abandon the coarse-grained tailings which account for 2.58% of the original ore yield and 43.51% of the total tailings, and make good use of the granular dissociation of the ore. characteristic. Early discarded tailings, not only to ensure that the nature of jobs to lower ore homogenization, but also reduce the re-grind, then the amount of dressing, help to improve the whole process of sorting index. It can be seen that the strong magnetic separation operation plays an important role in this joint process.
(2) Strong magnetic separator for heavy-magnetic-floating process
The strong magnetic separator can eliminate the tailings with a yield of more than 30% and a grade of about 10% in the heavy-magnetic-floating process of the Hetai Iron Mine in the Qidashan Plant. The particle size is 0.045-0.03mm. Iron minerals can be efficiently recovered.
It can also be seen from the figures that the fine-grained tailings with a yield of up to 65.95% and +0.03mm are sorted and discarded by the strong magnetic operation, which not only reduces the load on the grinding and selection operations in the lower section, but also removes a large amount. The fine mud plays a role in purifying the pulp, thus creating conditions for the final selection of flotation (especially reverse flotation), which can greatly improve the flotation index and reduce the consumption of chemicals and operating costs. Moreover, it will bring benefits to the dewatering and filtration operations of concentrate processing. It can also be regarded as a preparatory operation for flotation. No matter from the aspects of mud removal effect, operation cost and process complexity, the strong magnetic operation is excellent in dry cleaning, machinery or flocculation and other similar operations.
(1) Strong magnetic separator for magnetic-heavy process
The Gongchangling Plant has adopted a combined process of weak magnetic-strong magnetic-grading re-election to deal with the second choice of weak magnetic iron ore. Weak magnetic is used as a preparation for strong magnetism, and a coarse concentrate with a yield of about 10 to 20% can be selected for classification and re-election together with strong magnetic concentrate. This section of weak magnetic-strong magnetic operation adapts to the characteristics of large changes in the ratio of ferromagnetic iron ore and weak magnetic iron ore in the original ore, which reduces the impact on the lower sorting operation and makes the whole process stable and straightforward.
The test on the Ñ„500mm flat-ring strong magnetic separator shows that when the field strength is 64kA/m and the slurry concentration is 40-50%, the qualified tailings with the grade of 7.63~8.66% can be discarded; and the field strength is increased to 80kA/m. At the time, the grade of tailings can be reduced to 6.14%; if the field strength is increased to 104kA/m, the decline of tailings grade is not obvious. The industry adopts SHP-2000 type flat ring type strong magnetic separator. The average grade of strong magnetic tailings reaches 10.57%. The SHP-2000 type flat ring type strong magnetic separator is used. When the gap between dielectric plates is 4.2mm, Effectively deal with a graded overflow of the second selection workshop of Gongchangling Constituency, which can abandon the coarse-grained tailings which account for 2.58% of the original ore yield and 43.51% of the total tailings, and make good use of the granular dissociation of the ore. characteristic. Early discarded tailings, not only to ensure that the nature of jobs to lower ore homogenization, but also reduce the re-grind, then the amount of dressing, help to improve the whole process of sorting index. It can be seen that the strong magnetic separation operation plays an important role in this joint process.
(2) Strong magnetic separator for heavy-magnetic-floating process
The strong magnetic separator can eliminate the tailings with a yield of more than 30% and a grade of about 10% in the heavy-magnetic-floating process of the Hetai Iron Mine in the Qidashan Plant. The particle size is 0.045-0.03mm. Iron minerals can be efficiently recovered.
It can also be seen from the figures that the fine-grained tailings with a yield of up to 65.95% and +0.03mm are sorted and discarded by the strong magnetic operation, which not only reduces the load on the grinding and selection operations in the lower section, but also removes a large amount. The fine mud plays a role in purifying the pulp, thus creating conditions for the final selection of flotation (especially reverse flotation), which can greatly improve the flotation index and reduce the consumption of chemicals and operating costs. Moreover, it will bring benefits to the dewatering and filtration operations of concentrate processing. It can also be regarded as a preparatory operation for flotation. No matter from the aspects of mud removal effect, operation cost and process complexity, the strong magnetic operation is excellent in dry cleaning, machinery or flocculation and other similar operations.
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