IGLESIAS GONZÁLEZ , María Nieves

The laboratory experiment "Valorization of waste with high Zn content" was designed to introduce the concept of circular economy and waste recovery to students of the Materials Engineering Degree at the University of Seville (Spain). This laboratory experiment has been carried out every academic year since 2015-16. This document contains the...

Here, experimental data for the different stages of a bioprocess for obtaining copper from printed circuit boards are compiled. Chemical analysis data to determine the chemical composition of samples and residues. Conditions and results of batch and continuous leaching, solvent extraction, biooxidation and electrowinning tests are included.

El agotamiento de las reservas convencionales de oro y plata, ha originado que masas minerales cuya explotación y procesado fueron en un tiempo rechazadas, hayan pasado a tener, hoy en día, interés desde el punto de vista económico. La aplicación de la bi

Cet article examine l'évolution et l'état de l'art de la voiture électrique; il analyse les avantages environnementales, d'efficacité énergetique et des coûts du moteur électrique contre le moteur à combustion interne; il montre comme limitation sur l'usage des véhicules électriques le développement présent des piles rechargeables et la lente...

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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...

We are currently facing a change in the production model, moving from the traditional linear model to a model based on circular economy. This new paradigm implies minimization of waste. In this context, this work presents a laboratory practice focused on introducing the concept of circular economy and waste valorization to undergraduate...

This work studies the leaching of copper contained in waste printed circuit boards (PCB) with ferric sulfate, with the aim of improving the results found in the literature for an industrial application of the process. For this purpose, temperatures and concentrations of ferric ion higher than those of previous works (up to 60 °C and 40 g/L) are...

Experimental data of copper leaching kinetics from non-pulverized printed circuit boards are compiled. They consist of the leached copper values as a function of time for the different tests performed. The copper concentrations were measured by atomic absorption spectrophotometry. Moreover, scanning electron microscope photomicrographs and...

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...

PCBs constitute a residue rich in metals, among which copper stands out due to its majority content, much higher than that found in natural deposits, so that it is a potential secondary resource. Many attempts have been made to recover copper via biohydrometallurgy because it is an environmentally friendly route, however, one of its main...

The utility of ferrous iron biooxidation is to regenerate Fe(III) at required rates and conditions in specific hydrometallurgical contexts, such as metal extraction from ores/concentrates and mining and electronic waste. In these applications, considerable kinetics improvements can be achieved by increasing [Fe(III)], but pH must be decreased...

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...