Resumo

ROJAS, ANDRÉS F.  e  BARRAZA, JUAN M.. BENEFICIATION OF GUACHINTE (CAUCA) AND GOLONDRINAS ( VALLE DEL CAUCA) COALS USING A CYCLONE TEST RIG WITH TWO SEPARATION STAGES. Dyna rev.fac.nac.minas [online]. 2008, vol.75, n.156, pp.165-176. ISSN 0012-7353.

Two Colombian coals from South-West, Guachinte ( Cauca) and Golondrinas (Valle del Cauca)), were beneficiated using a dense medium cyclone with two separation stages in series. It was obtained a concentrated fraction in organic matter (beneficiated fraction) for each separation stage. Yield of beneficiated fractions obtained in the first separation stage were in the range 28 to 58%. Using the second separation stage, the maximum yield obtained for Guachinte coal was 71%. Ash content of beneficiated coal fractions was between 6.84 and 24.68%, which was lower than feed fractions 23.39 y 43.29%. A reduction in sulphur content was also found in beneficiated fractions of Guachinte coal in comparison to feed fractions, however, a contrary behavior was obtained for Golondrinas coal.

Palavras-chave : Beneficiated coals; medium cyclone coal; ash removal; sulphur removal.

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