Sorting method of low grade vanadium titano-magnetite
A vanadium-titanium magnetite, low-grade technology, applied in chemical instruments and methods, magnetic separation, solid separation, etc., can solve problems such as blockage of ore bins in the crushing system, and achieve the effect of reducing the mining loss rate
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Embodiment 1
[0024] After the raw ore is crushed, it is screened, and the material under the screen (below 12mm) is directly subjected to dry magnetic separation, and the belt speed and magnetic field strength tests are done. The test results are listed in Table 1 and Table 2
[0025] Table 1 Selected belt speed test results under the sieve
[0026]
[0027] Table 1 shows that as the belt speed increases, the concentrate yield decreases, the grades of total iron (TFe) and magnetic iron (mFe) increase, and the recovery rate decreases. When the belt speed reaches 2.1m / s, the tailings yield has reached 34.49%, and the total iron grade of the tailings has increased by more than one percentage point compared with 1.8m / s, so it is not suitable to continue to increase the belt speed. If the speed is too high, the recovery rate of total iron and magnetic iron in dry separation concentrate will be too low. For waste ore recycling, the main recovery is the magnetic iron in iron ore. At this time...
Embodiment 2
[0032] According to the conditions of the process flow at the production site, sampling was carried out on site, and a simulation test was carried out in the laboratory to obtain the following results (Table 3).
[0033] Table 3 stage selection index of grinding stage
[0034]
[0035] It can be seen from the results in the above table that the grade and recovery rate of the first grinding increase with the increase of the grinding fineness. When the grinding fineness exceeds 45% at 200 mesh, although the grade is still increasing , but the recovery rate drops instead, so the best condition is that the fineness is 200 mesh and the content is between 35%-45%. The relationship between the second grinding particle size and grade also has the same trend as the first time. With the increase of the grinding particle size, the grade also continues to rise. When the fineness is 200 mesh and the content exceeds 75%, although the grade is still in the increase, but the recovery rate...
Embodiment 4
[0037] 1. Use low-grade (Tfe (total iron) < 19%) vanadium-titanium magnetite as raw material, after crushing and screening; the particle size is below 12mm, and the magnetic field strength is 195-205KA / m (2400-2600OS) , After sorting by magnetic separation equipment with a belt speed of 2.0-2.2m / s, the tailings with a yield of more than 30% are thrown away, the yield of crude iron concentrate is more than 60%, the grade of total iron is more than 23%, and the recovery rate of total iron is 73% %above. The grade of the iron ore concentrate entering the grinding process has been greatly improved on the original basis, and the associated titanium minerals have been enriched in the ore concentrate.
[0038]2. After the first grinding of crude iron concentrate, when the fineness is 200 mesh and the content reaches 35-45%, it is sorted by a magnetic separator with a magnetic field strength of 2300OS, and the grade of vanadium-titanium-iron concentrate can be obtained. More than 45%...
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