ISSN 2594-357X
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The presence of relatively moderate quantities of ferromagnetic pyrrhotite in magnetite ores considerably restricts their amenability to conventional magnetite processing techniques employing multiple stages of wet grinding and low intensity magnetic separation. Bench flotation experiments on a skarn-type magnetite ore from Kazakhstan containing 2.0 to 3.5 percent sulphur were performed to systematically investigate the flotation behaviour of sulphides in general and pyrrhotite in particular. Specific emphasis was drawn on establishing the optimum grind size for sulphide liberation and the influence of sodium sulphide, copper sulphate, with and without collector, on flotation performance. Upon successful determination of the appropriate conditions for pyrrhotite removal, a processing flowsheet was developed and validated by pilot scale testing. The results obtained in the latter surpassed the values achieved at the laboratory scale and resulted in a high-grade final concentrate assaying 70 percent Fe and 0.15 percent sulphur, respectively.
The presence of relatively moderate quantities of ferromagnetic pyrrhotite in magnetite ores considerably restricts their amenability to conventional magnetite processing techniques employing multiple stages of wet grinding and low intensity magnetic separation. Bench flotation experiments on a skarn-type magnetite ore from Kazakhstan containing 2.0 to 3.5 percent sulphur were performed to systematically investigate the flotation behaviour of sulphides in general and pyrrhotite in particular. Specific emphasis was drawn on establishing the optimum grind size for sulphide liberation and the influence of sodium sulphide, copper sulphate, with and without collector, on flotation performance. Upon successful determination of the appropriate conditions for pyrrhotite removal, a processing flowsheet was developed and validated by pilot scale testing. The results obtained in the latter surpassed the values achieved at the laboratory scale and resulted in a high-grade final concentrate assaying 70 percent Fe and 0.15 percent sulphur, respectively.
Palavras-chave
Iron ore; Magnetite; Flotation; Sulphides; Pyrrhotite.
Iron ore; Magnetite; Flotation; Sulphides; Pyrrhotite.
Como citar
Araujo, Armando Correa de;
Reisinger., Matthias.
FLOTATION OF PYRRHOTITE
FROM MAGNETITE ORES – A KAZAKH CASE STUDY
,
p. 1928-1945.
In: 42º Seminário de Redução de Minério de Ferro e Matérias-primas / 13º Seminário Brasileiro de Minério de Ferro / 6th International Congress on the Science and Technology of Ironmaking,
Rio de Jabeiro,
2012.
ISSN: 2594-357X
, DOI 10.5151/2594-357X-22339
