高压辊磨对含硫酸渣超细铁精粉生球性能的影响

摘要：为解决某钢铁企业配加20%(质量分数)硫酸渣超细铁精粉成球性差、生球性能弱的问题，开展了高压辊磨预处理球团原料实验。探究了辊速、辊压、辊磨比例等因素对混合料的成球性和生球性能的影响，研究了在适宜辊磨参数条件下配加有机黏结剂对球团爆裂性能的提升作用。结果表明：在辊速280r/min、辊压1.0MPa、辊磨比例100%条件下，混合料成球性能和生球性能显著提高，其中，静态成球指数由0.28提高至0.81，生球落下和抗压强度分别由2.9次/(0.5m)、13.62N/个提高至4.2次/(0.5m)、18.52N/个；同时当有机黏结剂配比为0.2%时，生球爆裂温度由385℃提高至445℃，生球落下和抗压强度进一步提高到6.4次/(0.5m)、20.22N/个，生球性能满足生产要求。

Effect of high pressure roller grinding on green pellets properties of ultra fine iron concentrate containing pyrite cinder

Abstract：The preparation of pellet mixture by high pressure roller grinding was studied to solve the problem of poor pelletization and green pellet performance for adding 20 mass% pyrite cinder into ultrafine iron concentrate powder. The influences of roller speed, roller pressure, and roller grinding ratio on the mixture′s pelletization and green pellets performance were investigated. Meanwhile, the effect of adding organic binder on the burst temperature of green pellets was evaluated under the condition of suitable roller milling parameters. The results show that under the conditions of roller speed of 280r/min, roller pressure of 1.0MPa, and roller grinding ratio of 100%, the mixture′s static ballability index and green pellets performance are significantly improved. Specifically, the ballability index increases from 0.28 to 0.81, and the drop number and compressive strength of green pellets increase from 2.9times/(0.5m) and 13.62N/pellet to 4.2times/(0.5m) and 18.52N/pellet, respectively. At the same time, when the proportion of organic binder is 0.2 mass%, the burst temperature increases from 385℃ to 445℃, and the drop number and compressive strength of the green pellets are further augmented to 6.4times/(0.5m) and 20.22N/pellet. Finally, the performance of green pellets meet the production requirements.