The purification of quartz sand is mainly to remove a small amount trace impurities to obtain high purity quartz sand. The commonly used process is scrubbing, gravity separation, magnetic separation, flotation, acid leaching other processes.

1, scrub

The impurity iron, bond mineral mud on the surface of quartz sand are removed by mechanical force stripping force between sand grains. Scrub quartz sand mineral early can effectively discharge part of the impurities, clean the surface of quartz sand particles, so as to smoothly carry out the following purification work.

2, re-election

Gravity separation is the screening of minerals according to the different gravity of minerals. Mineral particles due to different density in the medium under the influence of fluid mechanical forces, resulting in loose stratification, thus ore particles are separated.

3, magnetic separation,

Magnetic separation is the separation of magnetic impurities minerals particles quartz sand. Quartz in the quartz sand is diamagnetic material, can be magnetized in the magnetic field, the impurities containing Fe Ti are mostly paramagnetic material, can be magnetized, so that the impurity containing Fe Ti can be removed by magnetic separation, to obtain a high content of quartz sand.

The equipment usually used for magnetic separation is wet high intensity magnetic separator high gradient magnetic separator.

4, the flotation

Flotation is the process of separating mineral particles by different physical chemical properties on the surface of mineral particles. Its main function is to remove the related minerals mica feldspar quartz sand. It is found that the pH value of pulp the type dosage of collector have significant influence on the flotation purification effect.

5, acid leaching

Quartz is insoluble in acid (except hydrofluoric acid), the impurities are separated by the dissolution of iron other harmful elements by the acid, resulting in high purity quartz sand. Impurities in quartz sand surface gap can be removed by acid leaching limit, magnetic separation flotation other physical methods can only remove mineral structure impurities.

It is found that the mixed acid is better to remove impurities in the process of acid leaching. Quartz will be dissolved by hydrofluoric acid, so the concentration of hydrofluoric acid in the mixed acid should be too high. Time, acid concentration, washing process temperature are all factors affecting the effect of acid leaching.

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