Abstract
The low chromium-to-iron ratio of chromite ores is an important issue in some chromite deposits. The value of the chromite ore is indeed dictated in the market by its iron, as well as its chromium content. In the present study, a chromite concentrate was reprocessed by gravity (spiral concentrator) and magnetic separation to enhance the chromium-to-iron ratio. Also, detailed characterization studies including automated mineralogy were carried out to better understand the nature of the samples. Enhancing the chromium-to-iron ratio was achieved by using advanced spiral separators which will be discussed in this paper.
Highlights
Chromite is the only available source of chromium metal which is used for alloy steels in the form of ferrochrome
The rejection of iron-bearing gangue minerals is drastically affected with an increase in the slurry pulp density, but the separation is favorable at a higher slurry flow rate
The influence of slurry density, as well as flow rate on the separation were analyzed in terms of chromium-to-iron ratio (Cr):Fe and enrichment ratios to understand the rejection of the iron-bearing gangue minerals
Summary
Chromite is the only available source of chromium metal which is used for alloy steels in the form of ferrochrome. Iron is one of the gangue element, which is present in the form of gangue minerals as well as in the chromite crystal lattice. It is well reported in the literature that the chromium-to-iron ratio (Cr:Fe ratio) of chromite ores plays a crucial role in the efficiency of ferrochrome production [1,2,3]. The chromite ore is beneficiated by using gravity concentration techniques. With the decrease in the particle size, separation of the chromite particles by gravity separation becomes difficult due to the presence of near density gangue minerals as well as limitation in the equipment design [7]
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