The inhibitor BK410 is a liquid which is easily dispersed in water, has good low-temperature fluidity, and has low viscosity. Compared with the currently used oleic acid, it has the characteristics of strong dispersibility and good selectivity. Water glass as inhibitors, BK410 recovering a calcite crystal fluorite as a flotation collector, the metallurgical performance is obtained over.

First, the nature of the ore

(1) Analysis of main chemical components of ore

The main chemical composition analysis results of ore are shown in Table 1.

Table 1 Analysis results of main chemical components of ore

(2) Mineral composition

The main purpose of the ore fluorite minerals, other non-metallic minerals are quartz, followed by feldspar, mica, garnet, apatite and small amounts of calcite, dolomite, clay minerals, sphene and other minerals; metallic minerals are limonite ore, followed by a small amount of sphalerite, brass other minerals pyrite and magnetite, hematite, hard manganese ore, galena, etc., metal ores, although mineral species More, but other metal minerals except for limonite are lower.

(3) Embedding characteristics of main minerals in ore

The fluorite in the ore is mainly produced in the form of irregular or granular aggregates. The size of the inlaid cloth is relatively coarse, and some of the fluorite and quartz are closely intertwined and the boundary is obvious. Some of the other gangue minerals such as quartz, mica, feldspar, garnet and calcite are irregularly embedded in the fluorite and its aggregates or filled along the cracks and intergranular gaps, and occasionally brown Metal minerals such as iron ore are embedded in it.

Quartz is one of the important minerals in ore and one of the main harmful impurities affecting the quality of fluorite concentrate. The quartz in the ore is mainly produced in the form of aggregates in the form of aggregates, sometimes in the form of a self-formed, semi-automorphic crystal structure. Quartz and fluorite inlays are closely related and tend to be closely symbiotic. It is often seen that quartz is embedded in the fluorite aggregate in the form of inclusions, sometimes seen in veins interspersed in fluorite fissures and their intergranular spaces, in addition to some The fluorite is embedded in the quartz in an irregular or vein form.

Calcite is the most important carbonate mineral in ore and one of the most important harmful impurities affecting the quality of fluorite concentrate. The calcite in the ore is mainly produced in the form of irregularities, embedded in fluorite and quartz. Calcite has a finer grain size than fluorite and is unevenly distributed. It is generally distributed in 50-100 μm.

Second, mineral processing test research

According to the study of process mineralogy, the content of CaF ₂ in the ore is relatively high, reaching 64.26%; the content of harmful impurities in the ore is also high in SiO ₂ and CaCO ₃ , wherein the SiO ₂ content is 28.44% and the CaCO ₃ content is 128%. It belongs to quartz-calcite-fluorite ore. Fluorite concentrate is the key to silicon reduction. Grinding is the key. The fluorite and quartz monomer must be dissociated by grinding to separate the fluorite from the quartz by flotation. For example, the grinding particle size is too coarse, and there is still a firefly in the grinding product. The continuous body of stone and quartz, the coarse concentrate contains high silicon. Both fluorite and calcite are calcium-containing minerals, and they are all floatable with fatty acids as collectors. Therefore, the separation of fluorite and calcite flotation is a difficult task, and it is necessary to use a suitable adjusting agent in combination with the collector to achieve better results.

(1) Grinding fineness test

The grinding fineness test was carried out under the conditions of crude sodium carbonate dosage of 2.0 kg/t, water glass dosage of 2.0 kg/t and BK410 dosage of 200 g/t. The test results are shown in Fig. 1. It can be seen from Fig. 1 that with the increase of grinding fineness, the recovery rate of fluorite coarse concentrate is not changed much, and the grade of coarse concentrate is gradually increased. Considering the grade and recovery rate of fluorite coarse concentrate, the grinding fineness is preferably 70%-74μm.

Figure 1 Grinding fineness test results

1-CaF ₂ grade; 2-CaF ₂ recovery; the same below

(2) Sodium carbonate dosage test

In the grinding fineness 70% -74μm, the crude water glass dosage 2.0kg / t, the collector BK410 dosage 200g / t, the crude sodium carbonate dosage test was carried out, the test results are shown in Figure 2. It can be seen from Fig. 2 that the grade and recovery rate of fluorite coarse concentrate gradually increase with the increase of sodium carbonate dosage, but when the amount of sodium carbonate is more than 2.0kg/t, the recovery rate of fluorite coarse concentrate tends to be stable. And the taste is down. Therefore, the amount of sodium carbonate is preferably 2.0 kg/t.

Figure 2 Sodium carbonate dosage test results

(3) Water glass dosage test

In the grinding fineness of 70% -74μm, the crude sodium carbonate dosage of 2.0kg / t, the collector BK410 dosage of 200g / t, the crude water glass dosage test was carried out, the test results are shown in Figure 3. It can be seen from Fig. 3 that as the amount of water glass increases, the grade of fluorite coarse concentrate gradually increases, and the recovery rate gradually decreases. Considering the grade and recovery factor, the water glass dosage should be 2.0kg/t.

Figure 3 Water glass dosage test results

(4) Species test of fluorite collector

The collector type test was carried out under the conditions of grinding fineness 70% -74μm, coarse selection of sodium carbonate 2.0kg/t, and water glass dosage 2.0kg/t. The test results are shown in Table 2. As can be seen from Table 2, the collector BK410 is superior to oleic acid in selectivity, and is superior to 733 in terms of harvesting ability, while taking into account the coarse concentrate grade and recovery rate. Therefore, BK410 was selected as the collector of the fluorite ore.

Table 2 Test results of collector types

(5) BK410 dosage test

The grinding agent BK410 dosage test was carried out under the conditions of grinding fineness 70%-74μm, coarse sodium carbonate dosage 2.0kg/t and water glass dosage 2.0kg/t. The test results are shown in Fig. 4. It can be seen from Fig. 4 that when the amount of the collector BK410 is 150 g/t, the grade and recovery rate of the coarse concentrate can be considered.

Figure 4 BK410 dosage test results

(6) Regrind test

It is known from process mineralogy that fine grinding is necessary because the inclusion size of some inclusions is fine and the monomer is sufficiently dissociated. To this end, the fluorite coarse concentrate regrind test was carried out, and the test results are shown in Fig. 5. After microscopic identification, the regrind fineness is 90%-38μm. Most of the fluorite minerals have been dissociated. Only a small amount of fluorite is associated with dolomite, quartz, calcite and pyrite. Considering comprehensively, the regrind fineness is preferably -38 μm in 90%.

Figure 5 Re-grind test results

(7) Closed circuit test results

On the basis of the conditional test, the centralized returning closed-circuit test of the middle-mine part was carried out. The principle flow of the test is shown in Figure 6. The test results are shown in Table 3.

Figure 6 Closed-circuit test principle process

Table 3 Closed circuit test results

Third, the conclusion

(1) The test fluorite ore contains CaF ₂ 64.26%, SiO ₂ 28.44%, and CaCO ₃ 1.28%, belonging to the quartz-calcite fluorite ore. The fluorite and quartz in the ore are mainly composed of coarse-grained inlays. Other impurities such as feldspar, mica, garnet and calcite are mainly medium-fine-grained inlays; there are also a small amount of impurities such as quartz and feldspar in the ore. It is embedded in fluorite in the form of fine granules.

(2) In this study, water glass was used as an inhibitor and BK410 was used as a collector. The fluorite concentrate was obtained by one rough selection, two sweeps, one coarse regrind, and seven selected processes. CaF ₂ 97.88%, SiO ₂ 0.72% and CaCO ₃ 0.71%, CaF ₂ recovery rate of 83.45% flotation index.

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