| Abstract: The solubilities of the quaternary system Li2O-MgO-B2O3-H2O at 40±0.05°have been studied. The Janecke projection diagram of system and the water-content curve of the double saturated solution-were consturcted (Fig. 1. 2). There are 8 ternary invariant points. e1, e2, e3, e4, e5, e6, e7 and e8 and 6 quaternary invariant points. E1, E2, E3, E4, E5 and E6 and 13 monovaiat lines: e1E1, e2E2, E1E2, e3E2, E2E3, e4E3, E3E4, e5E4, E4E5,e6E5, E5E6, e7E6 and e8E6 in the diagram. Whole diagram is divided by these Hues into 8 crystallization fields corresponding to the solid phases. H3BO3, 2MgO·3B2O3·15H2O (Inderite), MgO·2B2O3·7.7H2O, 5B2O3·10H2O, Li2O·2B2O3·3H2O5 LiBO2·2H2O, LiOH·H2O and Mg (OH)2 resectively. The fields of LiOH·H2O, LiBO2·2H2O, and Li2O·5B2O3·10H2O are very small, while that of Mg (OH)2 is so large as to occupy about 85% of the total area of the diagram, which is in good agreement with the solubility of Mg(OH)2 in water. |
