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Na_20-Al_2O_3-SiO_2-H_2O系相图对铝冶金、硅酸盐化学和热液成矿理论均有重要意义.Деревякин等研究Na_2O-Al_2O_3-SiO_2-H_2O系水热条件下的平衡固相并发表了相图.认为含氧化硅的铝酸钠-氢氧化钠溶液析出的平衡固相主要是“铝酸盐方钠石”(Aluminate-Sodalite,3[Na_2O·Al_2O_3·2SiO_2]NaAl(OH)_4·H_2O)和“碱性方钠石”(Basic Sodalite,3[Na_2O·Al_2O_3·2SiO_2]NaOH·H_2O),并在相图中划分了二者各自的初晶区.其中“碱性方钠石”实际上就是沸石化学文献中在方钠石β笼中嵌入NaOH的羟基方钠石(Hydroxy-Sodalite).它早已见诸文献,并为我们的实验验证.至于“铝酸盐方钠石”,显然是Дервякин为了解释低Na_2O/Al_2O_3比的溶液析出的方钠石样品SiO_2/Al_2O_3比小于2.0(一般可达1.6～1.9)
The phase diagram of Na_2O-Al_2O_3-SiO_2-H_2O is of great importance to the metallurgical, silicate chemistry and hydrothermal mineralization theories.Деревякин et al. Studied the equilibrium solid phase under Na 2 O-Al 2 O 3 -SiO 2 -H 2 O system hydrothermal conditions Phase diagram of the aluminate-sodium aluminate-sodium hydroxide solution containing sodium silicate is considered as the main phase of the aluminate-sodalite (3 [Na 2 O · Al 2 O 3 .2SiO 2] NaAl (OH) · H 2 O) and “Basic Sodalite” (3 [Na 2 O · Al 2 O 3 · 2SiO 2] NaOH · H 2 O), and their respective primary crystal regions were divided in the phase diagram, in which “ ”In fact, it is Hydroxy-Sodalite which is embedded in the sodalite β cage in zeolite chemistry literature and has long been reported in the literature and verified by our experiments.As for the“ aluminate sodalite ” , Apparently Дервякин in order to explain the low Na 2 O / Al 2 O 3 ratio of the solution precipitated sodalite sample SiO 2 / Al 2 O 3 ratio of less than 2.0 (generally up to 1.6 to 1.9)