Investigación de la relación entre el microfracturamiento producido por el explosivo y la disolución del metal en una mena oxidada de cobre

El efecto de la cantidad de explosivos es investigado con el propósito de conocer cuál es la influencia del explosivo con respecto a la cinética de la lixiviación de un mineral oxidado y conocer cuál es la recuperación del metal que contiene. Si la cantidad de explosivo es más grande nos permite obtener un mayor grado de microfracturamiento que permite una lixiviación más eficiente. Este microfracturamiento se conoce a través de medir la superficie específica del mineral, permitiendo conocer cuál es la acción de la onda explosiva. Se extraen tres muestras de mineral oxidado de cobre y se les lixivia en pruebas de laboratorio de lixiviación columnar. Los resultados de la cinética de la lixiviación y la recuperación del metal fueron positivos, es decir, fueron superiores cuando mayor es la superficie específica o la cantidad de explosivo. ABSTRACT The effect of the quantity of explosives is investigated with the purpose to know which is the influence of the explosive with regard to the kinetic of the leaching of a mineral one oxidized, and which the recovery of the metal that contains is. The greater quantity of explosives permits to obtain a greater one microcracking that permits a lixiviation more efficient. This microcracking knows him through measuring the specific surface of the mineral, permitting to know which the action of the explosive wave is. Three samples of mineral oxidized of Cu are extracted, and tests were performed of Iixiviation columnar. The results of the kinetic of the lixiviation and of the recovery of the metal they were positive, that is to say, they enlarged when enlarged the specific surface or the quantity of explosive key.

Intermediate band solar cells. The transition metal supersaturated Silicon approach

Within the framework of the third solar cell generation some new ideas to enlarge the spectral response of the solar cells toward the infrared have been proposed. Among them the inclusion of an Intermediate Band (IB) seems to be very promising. This paper will deal with one of the ways to generate the IB namely the deep level center approach. We will discuss not only its existence but also the carriers lifetime recovery which is necessary to obtain the expected increase of the solar cell efficiency.