IMMOBILIZATION OF SLUDGE FROM ACID WATER TREATMENT: PRELIMINARY RESULTS

Reference	Presenter	Authors (Institution)	Abstract
06-242	Carolina Del Roveri	Del Roveri, C.(Universidade Federal de Alfenas); Goda, R.T.(Universidade Federal de Alfenas); Pereira Oliveira, A.(Comissão Nacional de Energia Nuclear); Siqueira dos Reis, S.(PONTIFÍCIA UNIVERSIDADE CATÓLICA DE MINAS GERAIS); dos Reis, L.A.(PONTIFÍCIA UNIVERSIDADE CATÓLICA DE MINAS GERAIS);	This study aims to produce scientific and technical knowledge aiming at the development of techniques to immobilize the waste generated in the treatment of acid waters in the UTM-INB Caldas uranium mining and processing facility using Portland cement. This residue contains uranium compounds and metal hydroxides in a matrix of calcium sulfate. Currently, the only mitigation action carried out at UTM-INB Caldas is the treatment of these contaminated waters with hydrated lime for the precipitation of contaminants and this action will be performed for a long time generating enormous amount of this residue. Since 1998 INB has deposited the DUCA in the mine pit and today it is estimated that the amount of this residue deposited therein is about 67 thousand tons (Lima, 2014), and an additional 3700 tons (dry basys) are deposited in its interior annually from acid water treatment. It is observed that this material, in contact with the lake of acid waters of the mine pit itself, undergoes resolubilization and, therefore, changes the quality of the acidic water contained therein, changing the treatment parameters. The methods applied in this study were: determination of the mass of water contained in the residue deposited in the pit of the mine, as well as in the pulp resulting from the treatment of acid waters; chemical characterization of the residue; proceed with the immobilization of this residue using different residue / Water / Cement ratios. The results were satisfactory compared with those of other authors and the compressive strength and increased with the decrease in the ratio between water and cement. This study indicates that immobilization of the residue using cement is possible, however further studies in the area should be carried out.
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