Process for production of precipitated silica from olivine

Process for the production of precipitated silica from olivine including the following steps:-providing olivine particles with a particle size preferably below 1 mm in diameter,-preferably mixing olivine and water to form an olivine/water slurry,-mixing the olivine/water slurry with hydrochloric acid (HCl), preferably at a concentration at 18 wt % or above, and at a temperature preferably between 50-130° C., and reacting for a period of time, preferably between 20-360 minutes,-removal of coarse mineral impurities (sand product),-separation of precipitated silica from mother solution,-mechanical treatment of the separated precipitated silica and optionally some water to obtain a slurry,-preparation of a low viscosity slurry by adding sodium aluminate or another suitable aluminate, preferably to 100-6000 p.p.m., and adjusting the pH, preferably to values between 4-9-ageing at a temperature between 50-150° C. according to product requirements-dispersion of silica slurry-removal of fine mineral impurities (sand product)-drying of the silica.