CARRANZA MORA , Francisco

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Se estudia la cinética de la lixiviación de un concentrado de cobre con sulfato férrico en discontinuo. La velocidad de reacción está controlada por la etapa de difusión a través de una capa de producto de reacción, y es prácticamente independiente de la concentración inicial de ión férrico por encima de la estequiométrica. El empleo de sulfato...

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Se estudia la eliminación de la refractariedad de una mena de oro en matriz de arsenopirita. Se prepararon concentrados de flotación que se lixiviaron con sulfato férrico. Se comprueba que la capa de azufre elemental, depositada sobre la superficie del mineral durante la lixiviación férrica, no influye significativamente en la velocidad de la...

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Procedimiento de biooxidación de tiosales.La presente invención se refiere a un procedimiento para la eliminación de tiosales en aguas de procesos como las de concentración de menas de sulfuros metálicos mediante molienda y flotación, que comprende una et

This paper studies the ferric sulphate leaching of converter slag (9% Cu) in order to recover Cu through a process in which bacteria regenerate the leaching agent. For this purpose, the effect of variables such as pulp density, ferric concentration, temperature and size particle have been investigated. As the Cu extraction is limited by the...

En los procesos pirometalúrgicos, parte del cobre se pierde en la escoria que se genera como residuo del proceso, pudiendo estar presente en ella, en concentraciones muy superiores a las de muchas menas. El cobre se encuentra formando parte de pequeñas partículas de mata, metal blanco y blister, ocluidas en fase de fayalita. En este trabajo se...

Polythionates are formed by the incomplete oxidation of sulphide minerals in the grinding and flotation circuits, and particularly of those containing pyrite. Polythionate levels in the recycling water must be adjusted; otherwise, it can affect metal recoveries. The presence of different species, such as thiosulphate, trithionate, and...

A novel procedure to recover lead, silver and gold from polymetallic sulphide ores, cleaner than the traditional hydrometallurgical route (hot brine leaching), is proposed. This process consists of a biooxidation stage, where sulphides are oxidised by the action of extremophiles, followed by an acid washing and a citrate leaching in which lead...

A novel process for the integral treatment of polymetallic sulphide ores is proposed. The process consists of a global flotation, two stages of ferric leaching, the first stage dissolves the sphalerite and the rest of secondary sulphides, and the second dissolves the chalcopyrite with a silver catalyst, and finally a brine leaching to...

The flooded packed-bed bioreactor plays a major role in the field of applications of ferrous ion bio-oxidation. The pH is an important variable in the control of this type of reactor, upon which the functionality of biofilm depends. In the present work, five continuous flooded packed-bed reactors have been inoculated with mixed...

Nowadays sulphide ores exploitation is undergoing some troubles, which are hindering the treatment through traditional routes. Bulk flotation followed by a novel hydrometallurgical process can dodge these difficulties. In this work, an integral hydrometallurgical process consists of two ferric leaching steps, followed by a hot brine leaching...