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随着节能减排和环保要求的提高,石灰石作为造渣剂和冷却剂可直接应用于转炉炼钢。研究在高温(1 350~1 500℃)下是否存在因快速升温而使石灰石产生爆裂及因石灰石高速分解引起熔池喷溅具有重要意义。在实验室条件下,研究了煅烧温度、煅烧时间和颗粒粒径对石灰石颗粒热爆裂行为的影响。研究结果表明煅烧温度和时间对样品的热爆性影响较大,而固体粒径的影响相对较小。随着煅烧温度和时间增加,固体样品表面裂纹明显增多并破碎成小颗粒。结合固体颗粒因快速升温造成内部温度梯度引起的热应力和碳酸钙分解产物CO_2向外扩散压力,对煅烧温度、时间和粒径影响石灰石爆裂性的机理进行了简要分析。
With the improvement of energy-saving emission reduction and environmental protection requirements, limestone as slag-forming agent and coolant can be directly applied to converter steelmaking. It is of great significance to study whether there is a rupture of limestone at high temperature (1 350 ~ 1 500 ℃) due to rapid temperature rise and splashing of the weld pool caused by high-speed decomposition of limestone. Under laboratory conditions, the effects of calcination temperature, calcination time and particle size on the thermal rupture behavior of limestone particles were investigated. The results show that the calcination temperature and time have a greater influence on the thermal detonation of the sample, while the influence of the solid particle size is relatively small. As the calcination temperature and time increased, the surface cracks of solid samples increased significantly and broken into small particles. Combining the thermal stress caused by internal temperature gradient and the outward diffusion pressure of CO 2 decomposition product of solid particles due to rapid temperature rise, the mechanism of calcining temperature, time and particle size influencing limestone burst was briefly analyzed.