Effect of cooling temperature-holding time on the crystallization of molten-separated titanium slag
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摘要: 以某钢厂熔分钛渣为研究对象，通过高温熔析试验并结合XRD分析，系统探究了冷却温度（
1150 ～1300 ℃）协同保温时间（0～60 min）对熔分钛渣析晶行为的影响规律。结果表明：黑钛石相-MgTi2O5最优析晶窗口为温度1250 ～1300 ℃，时间30～50 min，析出量达 51.2%～56.2%；假板钛矿-Fe2TiO5最优析晶窗口为温度1150 ～1200 ℃，时间40～60 min，析出量达 38%～40%；金红石-TiO2最优析晶窗口为温度1150 ～1200 ℃，时间0～30 min，析出量 25%～35%。三者析晶行为呈现明显竞争关系，且单一物相优势析晶区间与其余两相抑制区高度重叠，为熔分钛渣特定含钛物相析晶的定向促进或靶向抑制提供精准工艺优化窗口，为工业熔分钛渣钛组分定向分离与提取提供了理论依据。Abstract: To achieve efficient extraction of titanium components from molten-separated titanium slag, this study took the slag from a steel plant as the research object, and systematically investigated the crystallization behavior of the slag under synergistic control of cooling temperature (1150~1300 ℃) and holding time (0~60 min) through high-temperature melting crystallization experiment and XRD analysis. The results indicated that the optimal crystallization window for anosovite-MgTi2O5 is 1250~1300 ℃ with 30~50 min, and the precipitation amount reaches 51.2%~56.2%; the optimal crystallization window for pseudobrookite-Fe2TiO5 is 1150~1200 ℃ with 40~60 min, and the precipitation amount is 38%~40%; the optimal crystallization window for rutile-TiO2 is 1150~1200 ℃ with 0~30 min, and the precipitation amount reaches 25%~35%. The crystallization behaviors of the three phases exhibit an obvious competitive relationship, and the optimal crystallization window of a single phase highly overlaps with the suppression regions of the other two. This provides a precise process optimization window for either directional promotion or targeted suppression of specific titanium-bearing phases, offering a theoretical basis for the directional separation and extraction of titanium components from industrial molten-separated titanium slag. -
图 2 渣样外观形貌
Figure 2. Appearance morphology of slag sample
（a）1150 ℃； （b）1200 ℃；（c）1250 ℃；（d）1300 ℃；
图 3 定性XRD分析结果叠加
Figure 3. Overlay patterns of qualitative XRD analysis
（a）1150 ℃； （b）1200 ℃；（c）1250 ℃；（d）1300 ℃；
图 4 不同冷却温度下含钛物相析出量随保温时间的变化趋势
Figure 4. Trend chart of Ti-bearing phase precipitation amount vs. holding time at different cooling temperatures
（a）1150 ℃； （b）1200 ℃；（c）1250 ℃；（d）1300 ℃；
图 5 析出量-保温时间的等温冷却曲线族
Figure 5. Isothermal cooling curve family of precipitation amount vs. holding time
图 9 含钛物相析晶量分布云图
Figure 9. Distribution contour maps of Ti-bearing phases precipitation
(a) MgTi2O5； (b) Fe2TiO5 ；(c) TiO2
表 1 熔分渣化学成分
Table 1. Chemical composition of molten-separated titanium slag
% TiO2 SiO2 Al2O3 CaO MgO Fe2O3 45.22 24.31 7.69 14.12 4.78 3.88 
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表 2 含钛物相特征析出区域
Table 2. Characteristic precipitation regions of Ti-bearing phases
Ti-bearing phase MgTi2O5 Fe2TiO5 TiO2 Preferred precipitation regions A1 B1 C1 Precipitation-suppressed regions A2 B21、B22 C21、C22
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