What are the purification processes of pegmatite high-purity quartz?

As an indispensable and irreplaceable functional material in semiconductor, optical fiber, photovoltaic, optical, electric light source and other industries, high-purity quartz is an important strategic resource.

In recent years, pegmatite-type quartz resources have become a new direction to search for high-purity quartz resources due to their advantages of large scale, less impurities, stable quality, and low fluid inclusion content.

The Altai region of Xinjiang, my country is a world-famous concentration area of granite-pegmatites. In the metamorphic rock belt with a length of 413 km and a width of 20-60 km, tens of thousands of various granite-pegmatite veins are exposed, forming more than ten The pegmatite-intensive area has the endowment conditions of pegmatite-type high-purity quartz resources.

The purification potential of different quartz raw materials is affected by the chemical composition of the ore, embedded particle size, gangue minerals, inclusions and lattice impurities. And different, the overall requirement is that the content of impurity elements is as low as possible.

The purification process of high-purity quartz mainly includes physical purification and chemical deep purification. Physical separation such as color separation, magnetic separation, and flotation can remove almost all gangue minerals in the form of monomers, and obtain a SiO2 content of 99.3% to 99.9%. Quartz, and to obtain higher purity quartz, chemical purification is required. Chemical deep purification mainly includes acid (alkali, salt) treatment and heat treatment, which mainly removes impurities existing on the surface of quartz sand particles or embedded in particles in the form of inclusions to obtain high-purity quartz sand.