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OPTIMIZATION OF A BACTERIAL LEACHING PROCESS FOR THE TREATMENT OF AURIFEROUS ARSENICAL PYRITES

Objective


The developed system has been demonstrated at different levels, including a full system test conducted underground in real conditions in the Potasas del Llobregat mine. This test was carried out on a Voest-Alpine AM-110 roadheader, a large machine weighing of 95 t and with a 300 kW cutting motor. Tests results were very positive and showed the technical feasibility of the original idea. There are no records of an equivalent experience with underground cutting machines at world level.

In detail, the most important partial results which are available from the project are summarized below:

- Image processing software able to combine colour, texture, and 'a priori' information, to recognize and identify natural rock and mineral formations (AITEMIN).

- Optimal decision software to define the most convenient trajectory/path, based on a parametric costs function and taking into account mechanical and operational restrictions (LAAS-CNRS).

- Robotic modelling and control of heavy mining/construction equipment (AITEMIN).

- Image fusion of multiple camera arrangements (AITEMIN).

- In-field calibration of cameras/robot reference systems, in natural and/or unstructured environments (LAAS-CNRS).

- Hardware/software structure for advanced automation applications in very harsh environments (AITEMIN).
ABSTRACT
The aim of the proposed programme is the "Optimization" of a bacterial leaching process for the treatment of auriferous, arsenical pyrites". For the implementation of this programme, METBA S.A. Greece as the coordinator will collaborate with the UWC CARDIFF, England and BRGM, France. The Olympias pyrite concentrate produced in Chalkidiki Northern Greece will be
examined as the case study. The current project will include basic research studies on bacterial oxidation of arsenopyrite and pyrite, aiming to provide the basis for optimal leaching conditions. Continuous laboratory tests in a mini-plant of a total installed volume of 30 1t will be conducted for reliable quantification of process mechanisms and operating variables. Experimental results Will be assessed in order to develop an optimized process flow-sheet for the treatment of Olympias auriferous arsenical pyrite concentrate and other similar refractory concentrates. The economic viability of this process will be also evaluated.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

Cheni SA
Address
39-43 Quai André Citroën
75739 Paris
France

Participants (3)

Bureau de Recherches Géologiques et Minières (BRGM)
France
Address
Avenue Du Concyr
45060 Orléans
National Technical University of Athens
Greece
Address
42,Odos 28 Octovriou 42
10682 Athens
UNIVERSITY OF WALES CARDIFF
United Kingdom
Address
Newport Road
CF2 1XH Cardiff