Resumo

ROJAS, ANDRÉS F.  e  BARRAZA, JUAN M.. MINERAL DISTRIBUTION IN TWO SOUTH-WEST COLOMBIAN COALS USING CYCLONE SEPARATION AND OXIDATION AT LOW TEMPERATURE. Dyna rev.fac.nac.minas [online]. 2010, vol.77, n.162, pp.169-178. ISSN 0012-7353.

It was studied the mineral distribution of two Colombian coals using a cyclone separation and oxidation at low temperature, OLT. The cyclone separation was carried out at two densities (1.3 and 1.4), three particle size (-1000+600µm, -600+425µm and -425+250µm) and two processing stages. To determine the mineral matter, feed and underflow fractions from hydrocyclone were concentrated in mineral matter by OLT in a fluidized bed (T< 300ºC). 18 minerals were identified by X Ray Diffraction, XRD. XRD results showed 13 minerals from Golondrinas and 15 minerals from Guachinte coal. It was found that kaolinite and quartz were the most abundant minerals in coal fractions from Golondrinas and Guachinte. Furthermore, it was found that mainly minerals kaolinite, quartz, dolomite, jarosite, gypsum and pyrite, exhibited affinity towards mineral matter, while siderite and valerite showed affinity towards organic matter.

Palavras-chave : Mineral distribution; cyclonic separation; low temperature ash..

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