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首页> 外文期刊>ISIJ international >In-situ Phase Identification of Crystallized Compound from 2CaO·SiO2–3CaO·P2O5 Liquid
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In-situ Phase Identification of Crystallized Compound from 2CaO·SiO2–3CaO·P2O5 Liquid

机译：原位从2caO·siO 2 -3cao·p 2 O 5 液体的原位鉴定

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摘要

In dephosphorization process in steelmaking, phosphorus in molten iron is distributed into molten slag after oxidized, and it forms 3CaO·P_(2)O_(5). It has been known that dicalcium silicate (2CaO·SiO_(2)) formed in molten slag and 3CaO·P_(2)O_(5) make a solid solution, which could promote dephosphorization efficiency from molten iron. It has been reported that 2CaO·SiO_(2)–3CaO·P_(2)O_(5) solid solution (α phase) is formed for entire composition range at higher temperatures than 1673 K, and many previous studies on dephosphorization behavior assumed that the α phase would be precipitated from molten slag. However, we found that the α phase cannot be obtained at low phosphorus concentrations when the pellet of 2CaO·SiO_(2) and 3CaO·P_(2)O_(5) powders mixture is annealed and quenched to room temperature. In this study, we conduct high temperature in-situ X-ray diffraction analysis to the aerodynamically levitated sphere of the 2CaO·SiO_(2)–3CaO·P_(2)O_(5) liquid to identify primary crystallized phase. It has been verified that the α phase is precipitated from the liquid for wide phosphorus concentrations. In addition, a rapid phase transition of the 2CaO·SiO_(2)–3CaO·P_(2)O_(5) solid solution has been detected by the time-division X-ray diffraction with high resolutions when the levitated sample containing the α phase is quenched from the precipitated temperature.
机译：在炼钢中的脱磷过程中，熔融铁中的磷在氧化后分布到熔渣中，形成3caO·p_（2）O_（5）。已知在熔融渣和3CaO·P_（2）O_（5）中形成的二钙硅酸钙（2CaO·SiO_（2））制成固溶体，其可以从铁水中促进脱磷效率。据报道，2CaO·SiO_（2）-3CaO·P_（2）O_（5）固溶体（α相）在较高温度下形成的固体溶液（α相），比1673K在较高的温度下，以及许多关于脱磷的研究行为假设α相将从熔渣中沉淀出来。然而，我们发现，当2CaO·SiO_（2）和3CaO·P_（2）O_（5）粉末混合物的颗粒进行退火并淬灭至室温时，在低磷浓度下不能在低磷浓度下获得α相。在该研究中，我们对2CaO·SiO_（2）-3CaO·P_（2）O_（5）液体的空气动力学升高的球体进行高温原位X射线衍射分析，以鉴定初级结晶相。已经验证了α相从液体中沉淀出宽的磷浓度。此外，当含有<的悬浮样品时，通过时分X射线衍射检测到2CaO·SiO_（2）-3CaO·P_（2）O_（5）固溶体的快速相转变。当含有< i>α相从沉淀温度淬灭。

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