内蒙古某高硫高碱度磁铁精矿球团焙烧工艺研究

摘要

以内蒙古某高硫高碱度磁铁精矿为原料进行实验室造球试验,并进行了大量的焙烧试验研究.结果表明,延长预热、焙烧时间均能提高球团抗压强度,且预热时间对球团合格率影响最大;预热温度在900-1000℃为宜,焙烧温度在1200-1280℃为宜,并且温度越高强度越好;在预热段鼓风能有效降低预热时间至18min,每50 g球团通风量应不低于0.565 L/s;提高气流在球团中的流通性可以有效减少氧化时间;同等重量的大球比小球焙烧效果更好,合理粒径范围为11-16 mm.%High-sulfur and high-basicity magnetite from Inner Mongolia as raw material was chosen for laboratory pelletizing test and lots of roasting tests.The results show that the extension of the preheating and roasting time both can improve the compressive strength of the pellets,and the preheating time had the greatest influence on the qualified rate of finished pellets;the suitable preheating temperature is beyond 900℃ and 1000 ℃,the suitable roasting temperature is beyond 1200℃ and 1280 ℃,the high the temperature,the better the strength;adding an air blower in the preheating section can effectively reduce the preheating time to 18 min,and every 50 g pellets should have more than 0.565 L/s ventilation rate;improve the air flow performance in the pellets can effectively reduce oxidation time;under the condition of equal weight,the roasting effect of big balls is better than small balls,the suitable particle size range is 11-16 mm.