Beneficiation test of low grade fluorite

First, the mineral properties of the sample

    Complex sample composition, fluorite disseminated fine particle size, less than -400 mesh, calcium and iron garnet still exists even the living body, multi-element analysis of the sample (Table 1).

Table 1 Multi-element analysis results of samples (%)

   

Second, the sample float tungsten tailings fluorite flotation test

    (1) Rough test

    The rough selection test process is shown in Figure 1, and the test results are shown in Table 2.

Figure 1 Fluorite rough selection comprehensive condition open circuit test process

Table 2 Results of rough selection open circuit test (%)

    (2) Rough selection closed circuit test

    On the basis of the open circuit test, the rough selection closed circuit test was carried out. The test process flow is shown in Figure 2, and the test results are shown in Table 3.

Figure 2 Fluorite rough selection closed circuit test process

Table 3 Results of rough selection closed circuit test (%)

    (III) Fluorite selection condition test

    In the fluorite selection test, the combined inhibitors of sulfuric acid + water glass, water glass + SF-3, oxalic acid + CMC, SF-2, and LP were separately added. The test process is shown in Figure 3. The test results are shown in the table. 4.

Figure 3 Fluorite selection condition test process

Table 4 Results of fluorite selection conditions test (%)

    The results showed that the SF-2 and LP inhibitors were separately added and selected 7 times to obtain fluorite concentrate products with a CaF ₂ grade of 96.32%. The concentrate recovery rate was 29.6%, and the ore dressing index was excellent. In combination with other inhibitors. Therefore, it was determined that SF-2 and LP were selected as fluorite-selective inhibitors.

    (4) Concentrate re-grinding test

    According to the results of the selected condition test, SF-2 and LP inhibitors were separately added. After 7 selections, the fluorite concentrate product with a grade of 96.32% can be obtained, but the recovery rate of concentrate is not high, and the inspection is under the microscope. In the selected medium mines, some of the fluorite and gangue minerals exist in the form of continuum and parcels. This part of the minerals becomes the bottom product in the selection process and is the main cause of fluorite loss. Therefore, it is necessary to re-grind the fluorite concentrate to dissociate the fluorite from the gangue minerals. The regrind test was carried out in the test. The test process is shown in Figure 4. The test results are shown in Table 5.

Figure 4 Process flow of coarse concentrate regrind test

Table 5 Results of regrind test of coarse concentrate (%)

    (5) Fluorite flotation closed circuit test

    The test procedure is shown in Figure 5, and the test results are shown in Table 6.

Figure 5 closed circuit test process

Table 6 8 Closed-circuit test results of ^#样浮铁 tailings (%)

   

Third, strong magnetic separation test

    The concentrate product obtained by 8 ^# -like fluorite flotation recovery, although the concentrate grade is above 95%, but contains a small amount of impurities such as Fe and SiO2, most of which are present in the garnet mineral, which can be obtained by strong magnetic separation. Part of the impurities are removed to further purify the fluorite concentrate. A strong magnetic separation test was carried out on the open-circuit test fluorite concentrate and closed-circuit test fluorite concentrate to determine the magnetic field strength of 2000 Oersted. The test results are shown in Table 7.

Table 7 Results of strong magnetic separation test of fluorite concentrate (%)

    The test results show that after strong magnetic separation, the grade of fluorite concentrate has been improved. The test results of the impurity content of the fluorite concentrate before and after the strong magnetic separation are shown in Table 8. The test results show that the content of SiO ₂ impurities after the strong magnetic separation is reduced.

Table 8 Analysis of CaF ₂ content and impurity elements in fluorite concentrate (%)

   

Fourth, the full process test results

    The whole process test process of tungsten tailings fluorite flotation is shown in Figure 6. The test results are shown in Table 9. The test results can obtain a fluorite concentrate product with a CaF _{2 of} 98% and a recovery rate of 50.82%.

Figure 6 Tungsten tailings fluorite flotation whole process test principle flow

Table 9 Tungsten tailings fluorite flotation test results (%)

   

V. Conclusion

    Huangshaping for low grade molybdenum, bismuth, tungsten, fluorite, iron (garnet) ^# 8 multiple metal ore flotation fluorite-like, using a coarse sweep two crude concentrate regrinding, the selection of a mine, The re-election of China Mine 2 and the process of returning the rest of the mines can obtain the beneficiation index with CaF ₂ 98.0% and concentrate recovery rate of 50.82%.

    The coarse ore re-grinding operation can fully dissociate the target minerals, improve the grade of fluorite concentrate, and facilitate the improvement of the selected recovery rate.

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