ZnO-PbO-SiO2系状態図について
鉛製錬爰に関する基礎的研究 (第1報)
1973 年 89 巻 1029 号 p. 743-748
詳細
1973 年 89 巻 1029 号 p. 743-748
The equilibrium diagram of the system ZnO-PbO-SiO2 was studied by the methods of quenching, differential thermal analysis and X-ray diffraction.
(1) In the system 2PbO·SiO2-2ZnO·SiO2, a peritectic reaction (melt+2ZnO·SiO2=PbO·ZnO·SiO2) was found at about 13% 2ZnO·SiO2 and 1, 010±5°C. Moreover, an eutectic reaction (melt=2PbO·SiO2+PbO·ZnO·SiO2) existed to about 2% 2 ZnO·SiO2 and 730±3°C.
(2) It was found that only the above 2PbO·SiO2-2ZnO·SiO2 system and the compound PbO·ZnO·SiO2 may be considered besides the three respective binary system.
(3) The limiting solubility of ZnO in the silica-rich PbO-SiO2 melt determined the silica-saturated eutectic curve in the temperature range of 750 to 1, 300°C.
(4) The isothermal lines of the liquidus surface were obtained in the temperature range of 800 to 1, 200°C.
(5) Moreover, two ternary eutectic and three ternary peritectic-eutectic points were presumed, thus the equilibrium diagram of the system ZnO-PbO-SiO2 could be established almost completely.
