There are several methods for purifying quartz sand to remove impurities:
Scrubbing and desliming: With the help of mechanical force and the grinding and stripping force between sand grains to remove the film iron, bonded and mud impurity minerals on the surface of quartz sand and further wipe the unformed monomer mineral aggregate, and then achieve the effect of further purification of quartz sand through classification operation. At present, there are mainly mechanical scrubbing and ultrasonic scrubbing. The main factors affecting the scrubbing effect are the structural characteristics and configuration of the scrubbing machine, followed by the process factors (mainly including scrubbing time and scrubbing concentration).
Magnetic separation: magnetic separation is mainly used to remove magnetic minerals in quartz sand, such as hematite, limonite, biotite and other weak magnetic minerals can be removed by strong magnetic machine, while strong magnetic minerals such as magnetite can be removed by weak magnetic separator.
Flotation: Flotation is used to remove some impurities such as feldspar and mica in quartz sand that cannot be removed by magnetic separation to further improve its purity.
The above method is for reference only, you can consult the relevant literature or consult professionals for more information.