Separation of chromite particles from olivine by flotation

L. Turri*, F. Lapicque, H. Muhr, University of Lorraine, France; C. Rech, University of Caxias do Sul, Brazil

In order to develop steel industry with low carbon dioxide emissions, the global project consists of a sequestration process by mineral carbonation, an alternative in which CO2 is captured and chemically stored in solid carbonates. Olivine has been selected as mineral feedstock: it is a magnesium-iron silicate (Mg,Fe)2SiO4 that also contains small amounts of other metals e.g. Ni including chromium oxide with a concentration of 0,20-0,25 wt %. To ensure environmentally responsible process, the study is focused on the separation technologies for the recovery of valuable compounds. The challenge is based on the combination and the coordination of purification processes. Pre-treatment of olivine has been investigated to collect chromite particles by flotation before the carbonation reaction, for a particle size distribution in the range 20-100 ┬Ám.

Flotation is a physicochemical separation process based on the particles surface properties. Reagents are added to control the interfaces characteristics and to improve the selectivity. Furthermore, former investigations have been conducted to highlight the adsorption of both anionic and cationic collectors...

Session: L11 / F1- Short Oral + Poster Presentations
Day: 12 October 2016
Time: 14:45 - 16:45 h

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