Quartz Concentrates Based on Compact Quartzite

This paper presents a study of a variety of quartz material from East Sayan: compact quartzite from the Oka–Urik block. We have investigated the texture and structure of quartz and mineral and fluid inclusions in it. It has been shown that the fluid inclusions are located mainly in the quartz grains and that the major salt component in the fluid inclusions is sodium. In the case of compact quartz, we have proposed a process for the preparation of extrapure quartz concentrates. A distinctive feature of the process is high-temperature precalcination of quartz grit prior to chemical enrichment, which makes it possible to open the fluid inclusions and remove sodium.