The flotation method is mainly used to separate feldspar from quartz sand, but it can also be used to remove clay minerals such as mica and secondary pig iron from quartz sand. The most typical PTMS magnetic separation process uses hydrofluoric acid as activator and amine cationic collector for flotation under strong acidic conditions (pH2 ~ 3).
The first is the fluoro-acid method. This method is widely used because of its good flotation effect, easy control and stable index. However, fluoride ions have a great effect on land erosion and damage to the surrounding ecological environment.
The second is the non-fluorinated acid method. The biggest advantage of this method is to avoid the use of fluoride ions that are destructive to the environment, and the production index is stable, but the corrosion effect of strong acids on mineral processing equipment cannot be ignored. There are high requirements for PTMS magnetic separation equipment.
The third method is fluorine-free acid-free method. Under the natural pH condition, a unique high concentration pulp flotation environment is created by the reasonable allocation of cationic and anion collectors, and the purpose of priority flotation of impurity minerals is achieved by PTMS magnetic separation. However, because this method has strict requirements on raw sand treatment and pulp environment, it is not easy to control production, and it has not been widely used at present.
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