Deal with mineral stones containing two or more useful minerals, the single concentrate is sequentially selected from useful minerals. This process is called preferential flotation.
Deal with mineral stones containing two or more useful minerals, first, mix up and emerge useful minerals, then, gradually separated them. This process is called mixed flotation.
The preferential flotation process has high flexibility. It can adapt to the change of mineral stone grade. But it requires a higher content of the main mineral stones. There should not be too many associated mixed minerals.
The advantage of the mixed flotation process is that a large amount of gangue can be discarded after flotation. It reduces the amount of minerals that goes into follow-up procedure and cut down the subsequent cost of the action. But mixed flotation also has a painful problem, after flotation, the concentrate surface is sticky with collecting agent. Surplus chemicals are also retained in the mineral pulp. How to solve the problem of chemicals removal is the key to the success of mixed flotation.
Which one should we pick? Preferential flotation process or mixed flotation process? Please see the following strategies:
The preferential flotation process suits for the wolframite. Because in most of the wolframite stones, disseminated wolframite is the largest, the mineral content is the highest.
The mixed flotation process suits for scheelite. In nature, scheelite not only accompanies with minerals such as calcite, fluorite and molybdenum, but also mixes with phosphorus, arsenic and fluorine, etc. Therefore, the most common way is to make flotation of useful mineral stones, and then prepare a special renovation.
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