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建立了几何尺寸相似比为1:5的中央扩散式精矿喷嘴冷态模型装置,用石英砂模拟精矿粉,用Matlab软件绘制接粒称重冷态实验颗粒分布云图,研究了反应塔内颗粒分布均匀性随分散锥、投料速度、工艺风和分布风变化的规律.结果表明,塔内颗粒分布均匀性可调控,分散锥和投料速度对颗粒分布均匀性影响小;随工艺风流量Qpro增加或分布风流量Qdis减小,颗粒向塔中心区域聚集,表征颗粒分布均匀性的颗粒质量偏析函数增加.实验范围内各工况Qdis和Qpro与颗粒质量偏析函数px之间的关系可拟合为px=(0.00025+0.3176/Qdis)Qpro1.51,拟合规律与文献和冶炼现场操作参数配置基本吻合.
The central diffusion concentrate nozzle cold model device with the geometric aspect ratio of 1: 5 was established. The concentrate powder was simulated with quartz sand and the cloud distribution of the cold test particles was drawn by Matlab software. The results show that the uniformity of particle distribution in the tower can be controlled, and the effect of dispersion cone and feeding speed on the uniformity of particle distribution is small. With the variation of process air flow Qpro Increasing or distributing the Qdis of airflow decreases and the particles gather in the central area of the tower and the particle mass segregation function that characterizes the uniformity of particle distribution increases.The relationship between Qdis and Qpro and the particle mass segregation function px in each experimental range can be fitted For px = (0.00025 +0.3176 / Qdis) Qpro1.51, fitting law and literature and smelting site operating parameters basically match.