As the needs of the development of industrial production, Maanshan Institute of Mining Research in recent years and has developed a type CS-2 DQC-1 type, DQC-2-series magnetic separator and permanent machine, leading manganese ore also create SHC-1 The type of strong magnetic separator is applied in industrial production. The Institute of Mineral Processing Equipment of the Ministry of Geology and Minerals also designed 2CQGS-330x1600 strong magnetic separator. The trial production of Xiangtan manganese mine was successful, and the equipment performance is summarized in Table 7.
The medium particle magnetic separator is widely used in the manganese ore industry, and the selection effect is summarized in Table 8.
Table 8 Â Technical index of selecting manganese oxide ore by medium particle magnetic separator | ||||||
Mine sample name | Raw ore manganese grade /% | Concentrate | Tailings manganese grade /% | Select the model used | ||
Yield/% | Manganese grade /% | Manganese recovery rate /% | ||||
Tuhu mineral sample | 28.86 | 71.04 | 36.05 | 88.74 | 11.22 | CS-1 type (industrial production index) |
Bayi Ore | 23.45 | 81.7 | 27.31 | 95.15 | 6.21 | CS-1 type (industrial production index) |
Wuming Bansu | 32.55 | 79.26 | 37.58 | 91.51 | 13.32 | CS-1 type (industrial production index) |
Pingle Silver Ridge | 23.97 | 85.22 | 27.15 | 96.53 | 5.63 | DQC-1 type (industrial production index) |
Daxinxialei | 31.62 | 30.54 | 40.65 | 39.26 | 27.65 | CS-2 type (industrial production index) |
Shanglin ore sample | 32.31 | 82.91 | 35.68 | 91.56 | 8.88 | SHP-1800 type (test index) |
Zhangpu mineral sample | 28.47 | 86.04 | 31.80 | 96.10 | 8.06 | SHP-1800 type (test index) |
Qinzhou Grand Corner | 24.3 | 90.71 | 26.00 | 97.06 | 7.71 | SHP-1800 type (test index) |
Mashan ore sample | 23.48 | 75.91 | 30.24 | 97.77 | 2.71 | SHP-1800 type (test index) |
Lead sample | 17.50 | 51.81 | 28.70 | 79.40 | 7.6 | SHP-1800 type (test index) |
Mugui mine sample | 27.74 | 89.68 | 30.21 | 97.67 | 6.26 | SHP-1800 type (test index) |
According to the development of technology, there are many permanent magnet series magnetic separators on the market, but most of them are mixed with coarse and medium particles. Because of the low manufacturing cost, light weight, and all dry selection, it is welcomed by small and medium-sized enterprises, especially individual sporadic laboratories. [next]
In addition to the large-scale production of the dry medium-particle magnetic separator mentioned above, Liuzhou Yuanjian Magnetic Equipment Factory has developed a new type of wet permanent magnet magnetic separator (see Figure 9), which has a magnetic field on the surface of the roller. 1.2T, light weight, power consumption, good effect of selecting granular manganese ore. However, since it is directly sorted by the roller body, the magnetic minerals are difficult to fall off. It has been washed with high-pressure water and forcedly rubbed with a stainless steel cylinder brush. The effect is not very satisfactory, but its development direction is correct, if it can be solved The application of magnetic minerals is infinite.
Third, fine particle strong magnetic separator
Mineral particles with a particle size of less than 1mm are generally referred to as fine-grained ores for manganese minerals. There are many types of strong magnetic separators for selecting fine particles and even fine particles, but magnetic separators for selecting fine-grained manganese ores are For industrial applications, there are only two SHP series magnetic separators and disc type magnetic separators.
In 1989, Xiangtan Manganese Mine completed the production process of recovering slime with SHP-1000 magnetic separator (Figure 10).
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The Lanqiao Manganese Mine, Chengkou Manganese Mine and Zunyi Manganese Mine have also been used for strong magnetic separation by SHP series magnetic separators, and all have obtained good technical indexes (Table 9).
Table 9 Â SHP series strong magnetic separation operation technical indicators | |||||||
Mine name indicator project | Concentrate yield /% | Manganese grade /% | Manganese recovery rate /% | Remarks | |||
Raw ore | Concentrate | Tailings | |||||
Lanqiao Manganese Mine | 85.54 | 12.26 | 41.12 | 7.37 | 48.6 | Using SHP-1000 magnetic separator, the particle size is 1~0mm | |
Chengkou Manganese Mine | 1 | 46.12 | 38.51 | 41.31 | 36.11 | 74.59 | 1SHP-700 magnetic separator selection |
2 | 69.61 | 35.94 | 38.51 | 30.05 | 49.47 | 2SHP-1000 magnetic separator rough selection | |
Zunyi manganese mine | 68.08 | 20.16 | 24.72 | 10.35 | 83.61 | Selecting manganese carbonate ore with SHP-2000 magnetic separator | |
SHP series magnetic separator can be effectively used for the sorting operation manganese ore, manganese ore, but often contain varying amounts of ferromagnetic minerals, easy to plug in the process of sorting the midpoint of the plate, it is necessary to increase the removal of ferromagnetic materials The measures, but the "magnetic plugging" phenomenon, will be removed from the installed SHP-700 magnetic separator. Secondly, it was reflected from the production plants of Xiangtan and Zunyi that the recovery effect of SHP series for manganese ore mud with a particle size of 0.03mm is not good. Therefore, they added a cyclone pre-selected de-sludge, which not only improved the processing time of the magnetic separator, but also slowed the blockage of the tooth plate. The filtration effect was also improved due to the reduction of the concentrate mud.
The equipment performance of the SHP series magnetic separator is shown in Table 10.
Table 10 Equipment performance of SHP series magnetic separator | |
model | SHP-700 |
Turntable diameter | 700mm |
Turntable speed | 3~6r/min |
Main drive motor | JZT32-4 |
power | 3KW |
Rotating speed | 120～1200r/min |
Magnetic field strength | 0～15000T |
Oster maximum excitation power | 11Kw |
Coil allows temperature rise | 80 ° C |
Number of mines | 4 |
Processing capacity | 4~6t/h |
Feed grain size upper limit | 0.9mm |
Mineral ore concentration | 45% to 50% |
Medium mine flushing water pressure | 2 to 4 kg/cm 2 |
Concentrate flushing water pressure (commonly used) | 5kg/cm 2 |
Concentrate flushing water pressure (standby) | 8～10kg/cm 2 |
Maximum part weight | >120kg |
Machine weight | 12532kg, 326kg |
Dimensions (length × width × height) | 2940mm × 1752mm × 3205mm |
The disc magnetic separator is a dry sorting method. In the past, it has been widely used in the separation of tungsten and tin . In the past ten years, some small enterprises have used manganese powder for sorting chemical industry. The particle size is <2mm, and the manganese concentrate contains dioxide. The manganese grade is over 60%, but the tailings grade is high and the production efficiency is low. It cannot be widely applied.
For the magnetic separation of fine-grained manganese ore, there are currently high-gradient magnetic separation, high-gradient magnetic separation and other exploration experiments, and the technical indicators are also good, but in view of the low price of manganese ore, economic problems cannot be solved, so it can only stay in the experimental stage. There have been no reports on the application of industrial production.
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