%0 Journal Article
%T Flota£¿£¿o do carv£¿o contido em um rejeito carbonoso
%A Ruiz
%A Astrid Sofia
%A Chaves
%A Arthur Pinto
%J Rem: Revista Escola de Minas
%D 2009
%I Escola de Minas
%R 10.1590/S0370-44672009000300009
%X the processes involved in coal preparation produce harmful effects for the environment, mainly by the quantity and nature of wastes that are generated. these tailings generally called ¡°pyritic¡±, even though not presenting a high pyrite content, are an acid material harmful to the environment. these tailings are usually disposed of in tailings dams. the tailings, studied in this work come from a process involving dense-medium cyclones and spirals. they have an ash content of 56% and a calorific value of 5,800 btu / lb, the sulfur content is 1.2%. in terms of size, the material is considered as ultrafine, as 63% of it is less than 0,014 mm. the coal matter content of these tailings is easily recovered by froth flotation, as evidenced in this work. it's possible to recover 74% of the coal matter and to obtain a product with 7.3% ash and calorific value of 14,225 btu / lb in dry basis.
%K coal
%K froth flotation
%K tailings.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0370-44672009000300009&lng=en&nrm=iso&tlng=en