An efficient process for the beneficiation of a low grade chromite ore

Abstract

The applicability of centrifugal force multigravity separator (MGS) to concentrate fine fractions (–0·1 mm) of a low grade chromite ore assaying 9·3%Cr₂O₃ was investigated. The metal screen analysis revealed that 83·92% of the material prepared for tests was in the +0·106 mm fraction containing 8%Cr₂O₃ and that 16·08% was in the –0·106 mm size fraction containing 16·12%Cr₂O₃. The +0·1 and –0·1 mm fractions of the ore was used as feed for shaking table and MGS tests respectively. The results gathered from shaking table test were not satisfactory due to low Cr₂O₃ recoveries. However, a chromite concentrate with 46·22%Cr₂O₃ grade and 66·1 wt-%Cr₂O₃ recovery was obtained by the combination of shaking table and MGS. It was clearly demonstrated that MGS is an ideal beneficiation equipment for fine fractions of a low grade Cr₂O₃ ore. Based on the experimental results, a principal flowsheet for the enrichment plant was proposed.

Keywords

FINE CHROMITE MULTIGRAVITY SEPARATOR GRAVITY SEPARATION

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