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首页> 外文期刊>ISIJ international >Crystallization Behavior and Growth Mechanisms of Spinel Crystals in Vanadium-Containing Slags
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Crystallization Behavior and Growth Mechanisms of Spinel Crystals in Vanadium-Containing Slags

机译：含钒渣中尖晶石晶体的结晶行为和生长机制

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摘要

To improve vanadium leaching and yield rates during wet vanadium extraction processes, the crystallization behavior and growth mechanism of spinel crystals in vanadium-containing slags were investigated by the mathematical models and high temperature experiments. The results show that the suitable temperature range for spinel crystallization was 1473–1573 K. And the spinels’ crystallization abilities were ranked FeCr_(2)O_(4) → FeV_(2)O_(4) → Fe_(2)TiO_(4). Although the concentration of chromium in the vanadium-containing slags was relatively low, the crystallization rate of all spinel crystals was greatly affected by the chromium spinels. The distribution of spinel diameters differed under the actual smelting condition, with the most common diameter range being 10–15 μ m. In addition, the mean diameter and volume fraction of spinels increased with prolonging holding time and decreasing temperature in the actual smelting temperature range. Spinel crystals grew rapidly with time at 1623 K, the mean crystal diameter changed from 15.0 μ m at 0 min to 24.9 μ m at 60 min. And the mean diameter and volume fraction of spinels treated at 1523 K for 30 min were 28.1 μ m and 46.3%, respectively. The mean diameter and volume fraction of spinel crystals increased with prolonging holding time and by decreasing the temperature in the actual smelting temperature range (1573–1673 K). Thus, the remaining slag process is beneficial to spinels growth in industrial vanadium-extraction process.
机译：为了改善湿法钒提取过程中的钒浸出和产量率，通过数学模型和高温实验研究了含钒渣中的尖晶石晶体的结晶行为和生长机制。结果表明，尖晶石结晶的合适温度范围是1473-1573 K.并且尖晶石的结晶能力被排名FECR_（2）O_（4）→FEV_（2）O_（4）→FE_（2）TIO_（4 ）。尽管含钒渣中的铬的浓度相对较低，但所有尖晶石晶体的结晶速率受到铬尖晶石的大大影响。尖晶石直径的分布在实际熔炼条件下不同，最常见的直径范围为10-15℃。另外，尖晶石的平均直径和体积分数随着延长的保持时间和实际熔炼温度范围内的温度降低而增加。尖晶石晶体随时间在1623k时迅速增长，平均晶体直径在60分钟后在0 min至24.9℃下改变为15.0℃至24.9μm。在1523k持续30分钟的尖晶石的平均直径和体积分别分别为28.1℃和46.3％。尖晶石晶体的平均直径和体积分数随着延长的保持时间而增加，并通过降低实际熔炼温度范围（1573-1673k）中的温度。因此，剩余的炉渣过程有利于尖晶石在工业钒 - 提取过程中的生长。

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