2012 - Europe Direct Iasi
2012 - Europe Direct Iasi
2012 - Europe Direct Iasi
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EUROINVENT <strong>2012</strong><br />
(pressure and composition of gas phase), and a device for<br />
phasing of solutions in micro-reactor. The installation allows the<br />
experimental modelling in solid-liquid, solid-liquid-gas, liquidgas<br />
multi-phases –multi-components systems, at pressures of<br />
0.5–1.75 atm., temperatures of 5–45 o C, and is easily adaptable in<br />
relation to an appreciable number of physic-chemical operational<br />
parameters.<br />
Financial support for the studies was provided by the Romanian<br />
Academy, Filial of Iaşi, Collective of Geography - III project /<br />
issue 3 / 2013 phase.<br />
X. 42.<br />
Title Advanced recovery of precious metals from secondary sources<br />
Authors Dumitru Bulgariu 1,3 , Laura Bulgariu 2 , Mihai Brânzilă 1<br />
Institution<br />
Description<br />
1<br />
“Al.I.Cuza” University of <strong>Iasi</strong>, Faculty of Geography;<br />
2<br />
“Gheorghe Asachi” Technical Univeristy of <strong>Iasi</strong>, Faculty of<br />
Chemical Engineering and Environmental Protection<br />
3<br />
Romanian Academy, Filial of <strong>Iasi</strong>, Collective of Geography<br />
This invention relates to the description of advanced recovery<br />
procedure of precious metals from secondary (sediments, alluvial<br />
deposits, mining dumps) by extraction in aqueous two- phase<br />
systems, formed from an organic polymer (polyethylene glycol,<br />
PEG) and an inorganic salt (ammonia sulphate). The utilization<br />
of aqueous PEG-based two-phase systems for the advanced<br />
recovery of precious metals, has a great potential due to their<br />
non-toxicity, durability and relatively low cost of preparation. In<br />
such extraction systems, the precious metals (Au, Ag, Pt) can be<br />
selectively separated after materials dissolution in presence of<br />
chloride ions, as extracting agents. The procedure described in<br />
this invention included: (i) the methodology for preparation of<br />
aqueous two-phase system adequate for precious metals<br />
extraction: type and characteristics (pH, concentration) of phaseforming<br />
salt, optimum concentration and molecular mass of<br />
polyethylene glycol, mixing ration of the phases and contact<br />
Innovative Researches<br />
192