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How to get rid of impurities in quartz?

Update:23-04-2021
Summary:

The quality of quartz products is closely related to th […]

The quality of quartz products is closely related to the quality of quartzHigh Purity Milky white Sandblasting quartz tube. So how does quartz sand remove impurities? Here are several ways to remove impurities. The first is quartz scrubbing. Scrubbing is to remove the thin film iron, bonding and muddy impurity minerals on the surface of the quartz sand with the help of mechanical force and the abrasive force between the sand grains, and to further smash the unconsolidated mineral aggregates. Scrubbing can smash the unconsolidated mineral aggregates. After the grading operation, the preliminary purification effect of the raw materials is achieved. At present, there are mainly mechanical scrubbing and ultrasonic scrubbing.
Furthermore, there is magnetic separation. The magnetic separation process can remove weakly magnetic impurity minerals such as hematite, limonite and biotite, including conjoined particles, to a large extent. Generally speaking, the quartz sand containing mainly weak magnetic impurity minerals such as limonite, hematite, biotite, etc. can be selected using a wet-type strong magnetic machine at a rate of 8×105A/m or more; For strong magnetic minerals dominated by iron ore, it is better to use a weak magnetic machine or a medium magnetic machine for separation. The number of magnetic separations and the intensity of the magnetic field have an important influence on the effect of magnetic separation. With the increase of the number of magnetic separations, the iron content gradually decreases; and under a certain magnetic field intensity, most of the iron can be removed, but the magnetic field intensity will increase a lot afterwards , The iron removal rate has not changed much. In addition, the finer the grain size of the quartz sand, the better the iron removal effect, the reason is the high amount of iron-containing impurity minerals in the fine-grained quartz sand.
The other is quartz flotation. The typical process for flotation to remove the associated minerals feldspar and mica in quartz is hydrofluoric acid as the activator, and under strong acid conditions (pH=2-3), amine cationic collectors are used for flotation. However, with the enhancement of environmental protection awareness, fluorine-free flotation methods are now used.

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