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January 2019
Volume 71    Issue 1

Characterization of chromium(III) compounds isolated from different mineral ores using ammonium phosphate as flux

Mining Engineering, 2019, Vol. 71, No. 1, pp. 45-46
Chiweshe, T.T.; Potgieter-Vermaak, S.; Purcell, W.


ABSTRACT:

The advantage of using ammonium phosphate salt as flux is the selective precipitation of chromium(III) compounds, which are considered nontoxic and environmentally friendly. The technique in this paper is determined to have potential to be applied in the metallurgical industry, where it can be used in the beneficiation of chromite mineral ores. The higher chromium contents of chromite ores often require furnaces to run at higher temperatures of above 1,300 °C, which can cause shutdown of the ore processing plant and accumulation of the sticky chrome compounds — including toxic chromium(VI) waste — which are generated as byproducts. The other advantage of this technique is its low to moderate energy consumption compared to existing techniques.



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