添加剂强化铁矿石内配煤小球干燥过程热态强度

发布时间：2018-05-10 20:20

本文选题：制粒小球 + 含钠添加剂　；参考：《金属矿山》2016年01期

【摘要】：铁矿石内配煤制粒小球动态干燥过程的破裂、粉碎会严重影响还原效果。为提高小球干燥过程的热态强度,研究了含钠添加剂对铁矿石内配煤小球动态干燥升温过程热态强度的影响,并结合含钠添加剂对内配煤、铁矿石和膨润土Zeta电位的影响研究以及动态干燥小球的内部环境扫描电镜分析,探讨了含钠添加剂对制粒小球热态强度影响的机理。结果表明:1含钠添加剂可通过改善小球主要原料颗粒表面的亲水性来强化膨润土的黏附作用,从而使小球内部结构致密,热态强度提高。2添加剂配加量为3%时,动态干燥粉化率为5.23%,动态干燥小球的落下强度、抗压强度和群落粉化率分别为3.1次、10.88 N/个和3.26%,与不配加添加剂相比,各项指标显著改善。
[Abstract]:The dynamic drying process of coal pellets in iron ore is broken and pulverized will seriously affect the reduction effect. In order to improve the thermal strength of the pellet drying process, the effect of sodium additive on the hot state strength during the dynamic drying process of coal pellet in iron ore was studied, and the effect of sodium additive on the internal coal blending was studied. The influence of iron ore and bentonite on the Zeta potential and the SEM analysis of the dynamic drying pellets were studied. The mechanism of the effect of sodium additive on the thermal strength of pellets was discussed. The results show that the adhesion of bentonite can be strengthened by improving the hydrophilicity on the surface of the main raw material particles of the pellets, and the internal structure of the pellets can be densified. The thermal strength of the pellets is increased by the addition of 2. 2 additives and the addition amount is 3. 2%. The dynamic drying pulverization rate was 5.23, the drop strength, compressive strength and community pulverization rate of the dynamic drying pellets were 3.1 times 10.88 N / unit and 3.26%, respectively. The indexes were significantly improved compared with those without additives.
【作者单位】：中南大学资源加工与生物工程学院;
【基金】：国家自然科学基金项目(编号:51234008)
【分类号】：TD951

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