2011 - Europe Direct Iasi
2011 - Europe Direct Iasi
2011 - Europe Direct Iasi
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R.34.<br />
Title<br />
EUROINVENT <strong>2011</strong><br />
treatment with ecological polymers saline solution; (ii)<br />
selective modification of adsorption – desorption<br />
equilibriums and differential electromigration of ionic species<br />
under the action of an electric field; (iii) local concentration<br />
(near to electrodes) and immobilization of ionic species,<br />
followed by their elimination from soils and processing<br />
economic purpose. The procedure described by invention<br />
includes methodological details for each work step and<br />
applicability limits for several heavy metals (Cd, Pb, Cr, Ni,<br />
Co) in case of soils cultivated with vegetables.<br />
Financial support for the studies was provided by the<br />
Ministry of Education and Research from Romania, ANCS –<br />
CNMP, grants PNCDI II no. 52-141 / 2008.<br />
Selective separation procedure of gold(III) from wastes<br />
by extraction in aqueous two-phase systems<br />
Authors Laura Bulgariu 1 , Dumitru Bulgariu 2,3<br />
Institution<br />
Description<br />
1 Technical University Gheorghe Asachi of <strong>Iasi</strong>, Faculty<br />
of Chemical Engineering and Environmental<br />
Protection, 2 ”Al. I. Cuza” University of <strong>Iasi</strong>, Faculty of<br />
Geography and Geology<br />
3 Romanian Academy, Filial of <strong>Iasi</strong>, Collective of<br />
Geography<br />
This invention relates to the description of selective<br />
separation procedure of gold(III) from wastes, by extraction<br />
in aqueous two- phase systems, formed from an organic<br />
polymer (polyethylene glycol, PEG) and an inorganic salt<br />
(ammonia sulphate). The utilization of aqueous PEG-based<br />
two-phase systems for the extraction of precious metals, in<br />
special of gold, has a great potential due to their non-toxicity,<br />
durability and relatively low cost of preparation. In such<br />
extraction systems, the gold(III) can be selectively separated<br />
after wastes dissolution in presence of chloride ions, as<br />
extracting agents. The procedure described in this invention<br />
included: (i) the methodology for preparation of aqueous twophase<br />
system adequate for gold extraction: type and<br />
characteristics (pH, concentration) of phase-forming salt,<br />
optimum concentration and molecular mass of polyethylene<br />
glycol, mixing ration of the phases and contact time; (ii)<br />
concentration range of chloride extracting agents; (iii)<br />
experimental conditions required for the efficient extraction<br />
of gold(III); (iv) efficiency, selectivity and implementation<br />
Innovative Researches<br />
159
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