Separation of Mg and Si from low-grade magnesite through sulfuric acid leaching method

摘要

Sulfuric acid leaching method was used to separate magnesium and silicon from low-grade magnesite directly in this paper. The studies indicate that when the reaction time is 2 h, reaction temperature 150 °C, mixture ratio of acid and magnesite 3∶1 (ml∶g), acid concentration 70 %, the extraction rate of Mg is 96.2 %. The acid-leaching residue was detected by XRD and SEM. The main component of residue is SiO2, minute quantity talc phase exists. The residue is cellular, the framework of magnesite particles isn''t destroyed.