Carlos Grima Olmedo

EVALUACIÓN DE LA INFLUENCIA DEL MARCO GEOLÓGICO EN LA CONCENTRACIÓN DE As, Pb y Sb EN SUELOS Y AGUAS SUBTERRÁNEAS

There is growing interest in assessing the risks from exposure to soil, air and water pollutants. This paper presents a study of spatial patterns and associations between As, Pb and Sb. The peninsular territory of Spain, with complex geology, has been analyzed with two large units: the western half (Hercynian domain) and the eastern one (Alpine-Watershed Domain Tertiary). The starting point is the Geochemical Atlas of Spain, co-financed by the European Economic Area (63 elements analyzed in 40,000 soil samples and current sediments). The groundwater quality data comes from the Ministry of the Environment.

REVISIÓN DE LOS EQUIPOS DE DECANTACIÓN PARA ESTÉRILES DE MINA: DEL ESPESADOR CONVENCIONAL AL DE CONO PROFUNDO PARA LA PRODUCCIÓN DE PASTA

ABSTRACT: Thickeners are solid-liquid separation equipment in which a slurry forming a pulp is fed to a tank provided with an internal mechanism in which solids are settled by gravity and can concentrate in the bottom of the tank and at the same time the clarified water overflows towards the surface to be collected in the peripheral launder of the tank. Usually the parts of the settling device are in essence the same from the early designs, although the most modern equipment and new technology advances have mainly been applied to the components that make up the internal mechanism, which provides higher performance in operation. Over the years, tailings and sludge thickeners have experienced a reduction in the size and diameter required for the same solids feed rate. It has been improved by the use of high efficiency synthetic polymer flocculants, which result in a reduction of the size and tank diameter compared to the early conventional designs not using flocculants; the modern thickeners have also maximize their effectiveness by using different pipe feeding and collection systems. Keywords: ?Clarification, paste, sedimentation, tailings, thickeners.