High-purity (99.9+%) nanosize Cr 2 O 3 was produced from chromite concentrates. Sodium dichromate was produced from an alkaline melt of chromite ore and then nanosize Cr 2 O 3 was obtained by reaction between sodium dichromate and sulphur. Nanooxides were investigated by scanning electron microscopy, transmission electron microscopy and X-ray diffraction analysis. The size of particles was 50-148 nm. The nanoparticles show a loosely agglomerated structure. The presented method is simple and economical.