Size effects in itabirite jigging under high frequency
DOI:
https://doi.org/10.5902/2179460X85455Keywords:
Gravity concentration, Mineral jig, Iron ore, ItabiriteAbstract
Concentration jigs have been used in ore dressing since the Middle Ages. Contrary to other sorting methods, gravity separation is a unit operation that implies low operational and environmental costs. This work describes the effect of particle size on separation efficiency using synthetic quartz and hematite mixes, simulating itabirite ores. The technological parameters of a Harz-Denver type jig were studied as a rougher stage at bench scale, employing previously sized samples. The experiments were carried out using 12 size classes, under a stroke amplitude of 7.0 mm and various pulse frequencies, including values above those historically practiced in the industry. Hematite content in prepared feeds was 40 %, 50 % and 60 %. It was observed that the jig has better performance with feed contents below 50 % hematite in the case of blends of middle and fine particles. The results were very promising. The concentrate average hematite grade was 89.35 %, from 40 % hematite feed, while the corresponding recovery was 97.62 % and a very high Gaudin’s selectivity index of 12.37. Nevertheless, the jig did not perform so well when it treated global samples (mix of all size classes), indicating the importance of the proper granulometric grading of the ore particles.
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