Kim main ore minerals are natural Tungsten metal gold, stibnite, scheelite, iron ore containing gold, followed by pyrite, wolframite, sphalerite like. The main gangue minerals are quartz, calcite secondly, apatite, pyrophyllite and the like. The scheelite is generally produced in coarse veins and irregular blocks in quartz veins, and sometimes in thin layers and flakes in stibnite, and a small amount is produced in thin lines in surrounding rock.

The plant uses a heavy-floating combined process to reproduce and float the sulphur concentrate. The quality of the smectite concentrate produced by re-election is relatively high, close to the special grade, and the quality of the scheelite concentrate obtained by flotation is slightly lower, and it is often mixed with the re-elected product. The ore supply for flotation operations is re-election (shaker) tailings. The principle of flotation principle is shown in Figure 1.

Figure 1 White tungsten ore flotation process

The ore mine is ground in two stages. The first section was coarsely ground to less than 0.8 mm, and coarse grains of white tungsten, rhodium and gold were selected by a shaker. Shaker and then finely ground to tailings 80 -0.074mm%, plus xanthate, black powder, lead nitrate and copper sulfate for flotation of gold, antimony, antimony, gold tailings after the float then scheelite flotation, and oleic acid As a collector , sodium carbonate adjusts the pH of the slurry to about 9, and water glass acts as an inhibitor of silicate. The scheelite is roughly selected to give a coarse concentrate containing about 5% of WO 3 . Because there are a large number of calcium-containing minerals such as calcite and apatite that also come up together, it is necessary to select scheelite. The selection uses the "dense slurry heating" method, that is, the white tungsten coarse concentrate is first concentrated to 50% solids, and a large amount of water glass (90 kg / t coarse concentrate) is added, and the steam is heated to about 90 ° C, and the mixture is stirred. Hours, then dilute the slurry to 20%, keep the pulp temperature between 26~30 °C, and select it at pH 9~10. At this time, calcium-containing minerals such as calcite are suppressed, and the apatite is still floating together with the scheelite, so the end of the process has the operation of acid leaching and phosphorus removal. The concentrate obtained by flotation contains WO 3 50%~55%, and after acid leaching, it contains WO 3 65%~70%, and the recovery rate is more than 85%.

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