Phase Diagram of the Quaternary Al(NO3)3-Cu(NO3)2-Zn(NO3)2-H2O System

The phase diagram of the H 2 O-Zn(NO 3 ) 2 -Al(NO 3 ) 3 -Cu(NO 3 ) 2 quaternary system at 30 °C has been established by using the conductivity measurements. The solid-liquid equilibria of the H 2 O-Zn(NO 3 ) 2 -Al(NO 3 ) 3 , H 2 O-Zn(NO 3 ) 2 -Cu(NO 3 ) 2 , H 2 O-Al(NO 3 ) 3 -Cu(NO 3 ) 2 ternary systems and two isoplethic sections were determined experimentally. The solid phases in equilibrium with the saturated solution are the tri- and hemipentahydrate of copper nitrate, the hexahydrate α and β of the zinc nitrate and the nonahydrate of aluminum nitrate. The copper and zinc nitrates are relatively soluble in opposition to the aluminum nitrate which presents some important precipitation domains.