2012 - Europe Direct Iasi

EUROINVENT 2012
(pressure and composition of gas phase), and a device for
phasing of solutions in micro-reactor. The installation allows the
experimental modelling in solid-liquid, solid-liquid-gas, liquidgas
multi-phases –multi-components systems, at pressures of
0.5–1.75 atm., temperatures of 5–45 o C, and is easily adaptable in
relation to an appreciable number of physic-chemical operational
parameters.
Financial support for the studies was provided by the Romanian
Academy, Filial of Iaşi, Collective of Geography - III project /
issue 3 / 2013 phase.
X. 42.
Title Advanced recovery of precious metals from secondary sources
Authors Dumitru Bulgariu 1,3 , Laura Bulgariu 2 , Mihai Brânzilă 1
Institution
Description
1
“Al.I.Cuza” University of Iasi, Faculty of Geography;
2
“Gheorghe Asachi” Technical Univeristy of Iasi, Faculty of
Chemical Engineering and Environmental Protection
3
Romanian Academy, Filial of Iasi, Collective of Geography
This invention relates to the description of advanced recovery
procedure of precious metals from secondary (sediments, alluvial
deposits, mining dumps) by extraction in aqueous two- phase
systems, formed from an organic polymer (polyethylene glycol,
PEG) and an inorganic salt (ammonia sulphate). The utilization
of aqueous PEG-based two-phase systems for the advanced
recovery of precious metals, has a great potential due to their
non-toxicity, durability and relatively low cost of preparation. In
such extraction systems, the precious metals (Au, Ag, Pt) can be
selectively separated after materials dissolution in presence of
chloride ions, as extracting agents. The procedure described in
this invention included: (i) the methodology for preparation of
aqueous two-phase system adequate for precious metals
extraction: type and characteristics (pH, concentration) of phaseforming
salt, optimum concentration and molecular mass of
polyethylene glycol, mixing ration of the phases and contact
Innovative Researches
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