The flotation method is mainly used to separate feldspar from molten quartz powder, but it can also be used to remove clay minerals such as mica and secondary pig iron from quartz sand. The typical process is to use hydrofluoric acid as activator and amine cationic collector to flotation under strong acidic conditions (pH2 ~ 3).
The flotation method can be divided into three kinds: one is the fluorine and 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 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 flotation equipment.
The third method is fluorine-free acid-free method. Under the condition of natural pH, a unique high concentration pulp flotation environment can be created by the reasonable allocation of cationic and anion collectors to achieve the purpose of preferential flotation of impurity minerals. However, because this method has strict requirements on the treatment of the original fused quartz powder and the pulp environment, it is not easy to control the production, and has not been widely used at present.
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