High-temperature heat capacity and metallurgical performance of Ca3TiFe2O8
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摘要: 烧结矿的质量很大程度上取决于其粘结相的特性。为促进钒钛磁铁矿资源在烧结领域的高效利用，对含TiO2的钙铁氧体体系进行了研究。在含钛铁矿烧结矿中发现了Ca3TiFe2O8（CTF）的存在，后经由固态反应成功制备出了CTF，并通过Drop法测定了CTF的高温热容，得到了其高温热容量的拟合函数。同时，还对其冶金性能（熔化性能和还原行为）进行了检测分析。结果表明，CTF的软化温度、熔化温度和流动温度分别为1418、1461 ℃和1480 ℃。非等温还原结果表明，CTF被一步还原成Fe、CaO和CaO·TiO2，当温度达到1150 ℃时，CTF还原完成。
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关键词:
- 烧结 /
- 钒钛磁铁矿 /
- Ca3TiFe2O8 /
- 高温热容 /
- 冶金性能
Abstract: The quality of the sintered iron ores is dominated by their bonding phases properties. The calcium ferrite system containing TiO2 was investigated to promote the efficient utilization of vanadium and titanium magnetite resources in the field of sintering. In this paper, Ca3TiFe2O8 (CFT) was found in titanium-bearing sintering ores, and CTF was successfully prepared by solid-state reaction. The high-temperature heat capacity of CTF was determined by the Drop method, and the corresponding fitting function was obtained. In addition, the metallurgical properties (including melting properties and reduction behavior) of CTF were determined. The results showed that the softening, melting and flowing temperatures of CTF were 1418 ℃, 1461 ℃ and 1480 ℃, respectively. The non-isothermal reduction results showed that CTF was reduced to Fe, CaO and CaO·TiO2 in one step, and the reduction process of CTF was completed when the temperature reached 1150 ℃. -
图 1 CTF试样的XRD图谱与CTF标准图谱
Figure 1. XRD patterns of CTF sample and its standard PDF card
图 2 在1200、1100 ℃以及800 ℃下所测的样品与蓝宝石热流峰
Figure 2. Heat flow curves of specimens and sapphire obtained by the drop calorimeter at 1200、1100 ℃ and 800 ℃
图 3 CTF的非等温还原与失重速率随温度的变化
Figure 3. The changes of non-isothermal reduction degree and DTG of CTF with temperatures
图 4 不同还原温度下CTF的物相组成（a）与微观形貌（b）
Figure 4. Phase composition (a) and microstructures (b) of CTF at different reduction temperatures
图 5 烧结矿典型物相中温还原度随时间的变化
Figure 5. Variation of isothermal reduction degree of typical phases in sintered ores with reduction time at 900 ℃
表 1 烧结矿典型物相在900 ℃的最大还原度及其还原时间
Table 1. Reduction degree of the typical phases in sintered ores and the corresponding reduction time
物相 还原度/% 还原时间/min 物相 还原度/% 还原时间/min H 0.99 35.5 CTF 0.89 79.2 M 0.97 76.1 C2F 0.89 114.4 CF2 0.94 92.8 Ki 0.83 141.5 CF 0.93 99.7 AT 0.67 150 
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