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handle: 10261/135434
[ES] El procedimiento está previsto para obtener un recurso renovable de metales, en particular tierras raras e itrio, a partir de aguas ácidas de mina, basándose en llevar a cabo una neutralización de la solución ácida rica en metales hasta un valor de pH de 4, mediante adición de una cantidad adecuada de reactivo alcalino, a continuación de cuya fase se lleva a cabo una precipitación masiva bajo las nuevas condiciones hidroquímicas de hierro, arsénico, cromo, molibdeno y vanadio, seguida de una neutralización de la solución anterior, hasta un valor de pH de 5,5, efectuándose finalmente una precipitación masiva bajo las nuevas condiciones hidroquímicas de aluminio, cobre, tierras raras e itrio. Este procedimiento se lleva a cabo mediante una instalación en la que existe un tanque (1) que recibe el agua ácida y un reactivo alcalino (3), seguida de una balsa decantadora (4) en la que se precipitan en el fondo lodos ricos en metales generados (10), y a continuación de dicha balsa (4) un segundo tanque (5) que recibe el agua mezclada con la adición de un reactivo alcalino (6), para que el agua ácida mezclada con ese reactivo alcalino alcance una segunda balsa decantadora (7), donde se produce la precipitación de lodos ricos en metales (10'), pudiendo ser recuperados los lodos ricos en metales a través de los sistemas de extracción (9, 9') previstas en las balsas decantadoras (4, 7).
[EN] The invention relates to a method for producing a renewable source of metals, in particular rare earths and yttrium, from acid mine water, based on: neutralising the metal-rich acid solution to a pH value of 4, by adding an adequate quantity of alkaline reactant; carrying out massive precipitation, under the new hydro-chemical conditions, of iron, arsenic, chromium, molybdenum and vanadium; neutralising the preceding solution to a pH value of 5.5; and finally carrying out massive precipitation, under the new hydro-chemical conditions, of aluminium, copper, rare earths and yttrium. This method is carried out using an installation including: a tank (1) that receives the acid water and an alkaline reactant (3), followed by a decanting basin (4), on the base of which sludge (10) rich in generated metals is precipitated, in turn followed by a second tank (5) that receives the water that is mixed with the addition of an alkaline reactant (6), such that the acid water mixed with the alkaline reactant reaches a second decanting basin (7) where metal-rich sludge (10') is precipitated, said metal-rich sludge being recoverable by means of the extraction systems (9, 9') provided in the decanting basins (4, 7).
Universidad de Huelva, Consejo Superior de Investigaciones Científicas (España)
A1 Solicitud de patente con informe sobre el estado de la técnica
Peer reviewed
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