一种含锰铁精矿球团性能试验研究

Experimental study on pellets performance of a kind of manganese-containing iron concentrate

针对一种粒度较粗的含锰铁精矿用于生产球团时存在生球质量差和成品球强度低等问题,本文通过磨矿试验和造球实验,研究了含锰铁精矿粒度对膨润土配比的影响,并对最佳磨矿条件下的含锰铁精矿球团性能进行了系统研究。结果表明:含锰铁精矿的细度对于生球质量影响较小,对于降低膨润土配比的效果不明显,球团预热和焙烧所需温度均高于普通磁铁精矿;在球磨机细磨10 min,膨润土配比为2.0%的条件下可制备出合格生球;在预热温度为1 020℃,预热时间为20 min,焙烧温度为1 280℃,焙烧时间为25 min的条件下,成品球团抗压强度可以达到2 456 N/P,能够满足高炉生产要求。

Aiming at the problems of poor quality of green pellets and low strength of finished pellets when a kind of manganese-containing iron concentrate with coarse particle size is used, in this paper, through grinding and pelletizing experiments, the influence of the particle size of manganese-containing iron concentrate on the ratio of bentonite is studied, and the performance of manganese-containing iron concentrate pellets under optimal grinding conditions is systematically studied.The results show that the fineness of the manganese-containing iron concentrate has little effect on the quality of the green pellets, and the effect of reducing the ratio of bentonite is not obvious.The temperature required for pellet preheating and roasting is higher than that required for ordinary magnetite concentrate.The qualified green balls can be prepared under the condition of fine grinding in a ball mill for 10 min and a bentonite ratio of 2.0%.When the preheating temperature is 1 020 ℃,the preheating time is 20 min, the baking temperature is 1 280 ℃,and the baking time is 25 min, the compressive strength of the finished pellets can reach 2 456 N/P,which can meet the requirements of blast furnace production.