LEADER 01166nam a2200277 i 4500 001 991000784309707536 008 050127s2004 it a ita 020 $a8837028040 035 $ab13272378-39ule_inst 040 $aBiblioteca Interfacoltà$bita 082 0 $a720.924 100 1 $aDavies, Paul$044918 245 10$aMichele Sanmicheli /$cPaul Davies e David Hemsoll 260 $aMilano :$bElecta,$cc2004 300 $a403 p. :$bill. ;$c29 cm. 500 $aIn custodia 600 14$aSanmicheli, Michele 700 1 $aHemsoll, David$eauthor$4http://id.loc.gov/vocabulary/relators/aut$0285423 907 $a.b13272378$b02-04-14$c27-01-05 912 $a991000784309707536 945 $aLE019 A16 AR C 36$g1$i2019000029216$lle019$o-$pE100.00$q-$rl$s- $t0$u0$v0$w0$x0$y.i14330295$z04-12-06 945 $aLE002 Ar. 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In hydrometallurgy, the aimed metal is first transferred from ores and concentrates to a solution using a selective dissolution (leaching or dry digestion) under an atmospheric pressure below 100 °C and under a high pressure (40-50 bar) and high temperature (below 270°C) in an autoclave. The purification of the obtained solution was performed using neutralization agents such as sodium hydroxide and calcium carbonate or more selective precipitation agents such as sodium carbonate and oxalic acid. The separation of metals is possible using a liquid/liquid process (solvent extraction in mixer-settler) and solid-liquid (filtration in filter-press under high pressure). Crystallization is the process by which a metallic compound is converted from a liquid into a solid crystalline state via a supersaturated solution. The final step is metal production using electrochemical methods (aqueous electrolysis for basic metals such as copper, zinc, silver, and molten salt electrolysis for rare earth elements and aluminum). 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