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Advanced eco-technology for a superior valorisation of the mining by-products


The project aims at the development of an eco-technology for chemical extraction of gold and silver from ores or mining by-products, to increase the recovery degree.

Description of Projectidea

The implementation of proposed eco-technology could solve, in an easy manner, the problem of tailing dumps existing in "Golden Quadrangle" and in Baia Mare area (Romania), because those who have not been rehabilitated yet, have an adverse impact on the environment (soil, groundwater, air pollution). The valorization of dumps, even those with low precious metal contents would be a solution of the problems facing those communities.
The method is applicable to tailing and by-products, such as pyrite concentrates, flotation tailings and metallurgical slag. The technology uses as a reagent a solution of ammonium thiosulphate in an alkaline medium and a catalyst consisting of a copper amine, given that reagents recycling occur in the leaching process. The eco-technology resolves a technical issue, that is important in the recovery of gold and silver from ore, mining byproducts and residues with low precious metal content (minimum 0.5 ppm Au), in terms of using non-toxic reagents and in relatively small concentrations, and full recirculation of reagents, respectively.

Consortium of partners, already involved

NATIONAL INSTITUTE FOR RESEARCH AND DEVELOPMENT IN OPTOELECTRONICS – INOE 2000, Research Institute for Analytical Instrumentation Cluj-Napoca Subsidiary (ICIA), Romania, with competencies in:
- purification, concentration of precious and common metals
- ICP-OES, ICP-MS determination of metals

Partners sought to complete the consortium

- experience in hydrometallurgy, process design and waste management


Recovery of raw materials from End-of-life products (ERA-MIN Joint Call 2)


Dr. Mirela Miclean
INCDO-INOE 2000, Research Institute for Analytical Instrumentation Cluj-Napoca Subsidiary (ICIA)
67 Donath
400293 Cluj-Napoca
Phone: +40 264 420 590
Organisation: Research Organization