Study on Granulation Performance of Blast Furnace Slag by Gas Quenching
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摘要: 通过试验研究了不同气流速度及熔渣黏度对气淬高炉熔渣粒化性能的影响,包括平均粒径、粒径分布及成珠率。结果表明:气淬高炉渣粒径主要分布在1~3 mm;随气流速度增加,渣粒平均粒径减小,成珠率先增加后降低,<3 mm粒径比例逐渐增加;随黏度增加,渣粒平均粒径增加,成珠率降低,<3 mm粒径比例有所减少;最佳气流速度为550 m/s,低黏度有利于提高粒化性能。气流速度增加不稳定波增强且液丝变细容易破碎,液滴平均粒径降低,但换热效果增强,导致容易形成纤维,所以成珠率先增加后降低;黏度增加不稳定波降低且液丝变粗不容易破碎,液滴平均粒径增加,成珠率下降。Abstract: Gas quenching dry slag granulation process is one of the dry slag treatment processes,and granulation performance mainly includes the average diameter,size distributions and bead forming rate.The effects of different gas velocity and slag viscosity on the granulation properties were experimentally studied.The results indicates that the particle size is mainly distributed between 1~3 mm.With the increase of airflow velocity,average diameter of slag particles decreases,and the proportion of the particles which are smaller than 3 mm increases gradually.Bead formation rate firstly increases and then decreases.With the increase of viscosity,average diameter of slag particles increases,and the proportion of the particles smaller than 3 mm decreases gradually,and bead formation rate decreases.The optimum airflow velocity is 550 m/s and low viscosity is beneficial to improve the granulation performance.With the increase of airflow velocity,the unsteady wave is strengthened and the ligaments are thinner,which is readily to break,so the average diameter of droplets is reduced.But the heat transfer effect is enhanced,which leads to the formation of fibers,so the bead formation increases firstly and then decreases.With the increase of viscosity,the unstable wave decreases,the diameter of the droplet increases,and the bead forming rate decreases.
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Key words:
- blast furnace molten slag /
- gas quenching granulation /
- diameter /
- bead formation rate
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