(4) CaO•SiO 2 -FeO•SiO 2 system state diagram (Figure 10)
1) wherein there are 2 (CaO • FeO • 2SiO 2 ) Calcium compounds belonging labile iron pyroxene CFS, βCS decomposition of a solid solution at about 950 ℃, i.e., FeO • SiO 2 solid solution with CaO • SiO 2.
2) CS itself has a high melting point of 1550 ° C. Since it can form a low-melting point solid solution with FeO•SiO 2 , it precipitates below 1200 ° C during cooling.
(5) FeO-solid solution (Fig. 11, Fig. 12. FeO can form different degrees of solid solution with CaO, MgO, MnO. In the FeO-CaO system, when the temperature is >1070 °C, CaO forms rapidly in Fe x O solid solution, as will be rapidly cooled, then may be maintained in Fe x O 18% CaO, Fe x O while the lattice constant of 4.400A o increases from 4.312A o. when the temperature drops, the solubility is also decreased. slow When cooling, only 4% CaO is dissolved at normal temperature. [next]
FeO-MgO FIG. 12 is a continuous solid solution, magnesium oxide is referred persons floating body which can be melted with each other without any restriction. As the MgO content increases, the temperature of the solid solution also increases. Figure 13 is a state diagram of FeO-MnO, MnO can be partially dissolved in Fe x O, and Fe x O can also be partially dissolved in MnO. Therefore, there are (Ca, Fe, Mn, Mg) x O phases in the self-fluxing ore, which have a weaker effect on the etchant S n Cl 2 than Fe x O, so it is more difficult to distinguish from Fe x O with ferric acid. The difference in calcium is also difficult.
(4) High alkalinity sinter mineralization process
The high alkalinity sinter is characterized by the addition of more CaO in the sinter, and the metallogenic process can refer to the CaO-Fe 2 O 3 binary phase diagram. From the 14CaO-Fe 2 O 3 binary diagram, we can see:
(1) There is one stable compound and two unstable compounds. The melting point of 2CaO•Fe 2 O 3 is 1449 ° C, and there is a CaO-Fe 2 O 3 hetero-melting point compound, the melting temperature is 1216 ° C. CaO-2Fe 2 O 3 is also an iso-melting point compound, at 1155 ° C ~ 1226 °C is stable and decomposes into CaO-Fe 2 O 3 and Fe 2 O 3 at 1155 °C. It is worth noting that CaO-Fe 2 O 3 and CaO-2Fe 2 O 3 can form the eutectic mixture with the lowest melting point in the system, and its melting point is 1205 °C.
(2) Once the liquid phase of ferric enzyme calcium (2CaO-Fe 2 O 3 ) is formed, when the Fe 2 O 3 is gradually melted, its melting point is decreased, as shown by the arrow in Fig. 14, which is related to 2CaO•SiO 2 In the -2FeO•SiO 2 system, when lime is added to 2FeO•SiO 2 to form calcium olivine, the melting point is gradually decreased, which is exactly the same. These are the higher the sinter alkalinity and the lower sintering temperature, FeO. One of the reasons for the low.
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