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首页> 外文期刊>Journal Of The South African Institute Of Mining & Metallurgy >Investigation of the reactivity and grain size of lime calcined at extra-high temperatures by flash heating
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Investigation of the reactivity and grain size of lime calcined at extra-high temperatures by flash heating

机译：闪蒸加热调查超高温度煅烧石灰的反应性和晶粒尺寸

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摘要

In low-carbon energy-efficient basic oxygen furnace (BOF) steelmaking processes, limestone partly or completely replaces the active lime. The effects of limestone calcination temperature (1200-1500°C) and time (5-15 minutes) on lime reactivity and CaO grain size were investigated. The reactivity was evaluated by titration with hydrochloric acid, and the CaO grain size was analysed using scanning electron microscopy. The results revealed that for calcination temperatures higher than 1300°C, the reactivity reached a maximum and then decreased. The higher the temperature, the earlier the peak of reactivity appears. The CaO grains grow with increasing temperature and time, which leads to the decrease of reactivity. Notably, the effects of temperature on CaO grain size and reactivity are more marked than that of time. To obtain active lime calcined at ultra-high temperature by flash heating, the calcination conditions should be 1300-1400°C for 10-15 minutes, or 1400-1500°C for 8-10 minutes.
机译：在低碳节能基本氧气炉（BOF）炼铁工艺中，石灰石部分或完全取代活性石灰。研究了石灰石煅烧温度（1200-1500℃）和时间（5-15分钟）对石灰反应性和CaO晶粒尺寸的影响。通过用盐酸滴定反应性，使用扫描电子显微镜分析CaO晶粒尺寸。结果表明，对于高于1300℃的煅烧温度，反应性达到最大，然后降低。温度越高，较早的反应性峰值出现。 CaO晶粒随温度和时间的增加而增长，这导致反应性的降低。值得注意的是，温度对CaO晶粒尺寸和反应性的影响比时间更加标记。为了通过闪蒸加热获得在超高温下煅烧的活性石灰，煅烧条件应为1300-1400°C，10-15分钟，或8-10分钟的1400-1500℃。

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