Neutron experiments, fine particles

Results obtained from polarized neutron reflection measurements have been reported on granular samples consisting of Fe particles in an AI2O3 matrix. However, this experiment deals with surface studies and is not well adapted to the analysis of fine particle properties. Nevertheless, some features can be deduced. 

Neutron experiments lead to very reach features concerning particularly the dynamical properties of fine particles. However, at present, only one particle kind has been studied by inelastic neutron scattering and the studies of other particle types, other morphologies, would be interesting for the establishment of general behaviors. On the other hand, theoretical development would also be useful for the analysis of the data as well as the understanding of outcomes. 

Batch leach experiments were performed on tailings material to determine the nature of contaminants distributed on sand and silt and clay-sized fractions. For the batch leach experiments, a mixture of tailings material was prepared using a chemical dispersant (sodium hexametaphosphate (NaPO ) ). The mixture was shaken and allowed to settle in covered beakers for sufficient time such that no particles with a diameter > 50 /im remained in suspension. The fines, which remained in suspension, represented the silt and clay-sized fraction of the samples. At the end of the settling period, the liquid was decanted from the beaker. The remaining sand-sized tailings were dried and transferred to a sealed vial. The decanted solution was passed through a 0.45 /im membrane filter, previously washed with distilled water, and the filtrate was collected and placed in a sealed container. The solids were dried and transferred to a sealed vial. The samples were then analyzed by instrumental neutron activation analysis. 

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