Estimativa simultânea de parâmetros hidráulicos e de transporte em estéreis de mineração de urânio / Simultaneous estimation of hydraulic and transport parameters inwaste rock from uranium mining

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

30/06/2010

RESUMO

The present work aims to simultaneously estimate the hydraulic and transport parameters related to the material of one of the waste rock piles (Waste Rock Pile 4) from the Poços de Caldas uranium mining and milling facility. Before performing the estimation, it was necessary to study the chemical species that are dissolved from this material by the climate action, knowing a priori that the material is rich in pyrite (iron sulfide, FeS2). In order to follow the pyrite oxidation process within a controlled environment, an experimental apparatus called Acid Drainage Experiment was assembled. During tests, concentrations of various stable and radioactive chemical elements were determined in the liquid as well in the solid material before and after the tests. In addition, the total mass (or activity) dissolved, the rate of dissolution and the percentage of dissolution were calculated. Results showed which species are more easily dissolved and those that should be followed in contamination studies. The simultaneous estimation of the hydraulic and transport parameters was accomplished through the so called Solute Transport Experiment combined with the software Hydrus-1D. This software provides the numerical solution of an adequate model, using the Levenberg-Marquardt Technique for parameter estimation. The saturation water content qs, the saturation hydraulic conductivity Ks and the dispersion coefficient D were estimated. Results showed that the parameter D was well estimated, followed by qs and Ks

ASSUNTO(S)

urânio - minas e mineração minas - drenagem estimativa de parâmetro colunas experimentos uranium mine estimated parameters columns experiments

Documentos Relacionados