Use of chlorination for chromite upgrading

Ndue Kanari (1) , I. Gaballah (1) , Eric Allain (2)

1 LEM - Laboratoire Environnement et Minéralurgie
2 Missouri S&T - Missouri University of Science and Technology

The chlorination of a chromite concentrate was studied between 600 and 1000°C. The reaction products were analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD), and chemical analyses. Chlorination of a chromite concentrate at about 700°C allowed the extraction of about 50% of the iron, thus doubling the Cr/Fe ratio in the treated concentrate. Aluminum chloride was tested as a chlorinating agent in the presence of a reducing atmosphere. The effect of temperature on the kinetics of chromite chlorination was studied between 900 and 1040°C using thermogravimetric analysis (TGA). Temperature effects changed significantly with reaction extent. The initial stage of the chlorination was characterized by an apparent activation energy of about 112 kJ/mol, while a value of about of 269 kJ/mol was found for reaction extents greater than 0.4.

Mots clés: Chlorination; Chromite upgrading; Aluminum chloride

Domaines: Sciences de l'environnement; Planète et Univers [physics]; Chimie

Ndue Kanari, I. Gaballah, Eric Allain. Use of chlorination for chromite upgrading. Thermochimica Acta, 2000, 351, pp. 109-117. ⟨10.1016/S0040-6031(00)00423-8⟩. ⟨hal-01507442⟩