含碳球团低温熔分过程中硫的行为

Behavior of Sulfur in Melting Separation Process of Ore-Coal Composite Pellets at Low Temperature

根据低配碳比含碳球团还原低温熔分制备粒铁的技术思想,对含碳球团还原熔分过程中硫的分配及硫的行为进行了试验研究。结果表明,影响产品铁粒中硫质量分数的主要因素为碳质垫料、球团原料中硫量以及熔分后铁粒在炉内的停留时间。为了降低铁粒中硫质量分数,应尽量限制煤粉、铁矿带入的硫量。要选择硫量较低的碳质垫料,尽量缩短熔分后铁粒在炉内停留时间。垫料中混和适量的固硫剂有利于降低铁粒中硫质量分数。球团中添加CaO未见有脱硫作用,铁粒中硫质量分数反而稍有增加。球团中配碳比的增加会导致含碳球团中煤粉带入的硫量的增加,因此配碳比的增加会稍微提高铁粒中硫质量分数。

According to the technical idea of iron nugget production by reduction and melting separation of ore-coal composite pellets with low carbon ratio at low temperature,distribution and behavior of sulfur in melting separation process of ore-coal composite pellets was investigated experimentally.The results show that the important factor to effect on sulfur content of iron nuggets are sulfur contents of carbonaceous padding and raw materials of pellets and residence time of iron nuggets in the furnace.In order to decrease sulfur content of iron nuggets,it is necessary to limit sulfur amount in coal powder and iron ore.To select carbonaceous padding with low sulfur content and to shorten residence time of iron nuggets in the furnace,the addition of sulfur fixation agent to carbonaceous padding is in favor of the decrease of sulfur in iron nuggets.Desulfuration effect of CaO addition in pellet is not clear,on the contrary,increase sulfur content of iron nuggets.The increase of carbon ratio in pellets result in increase sulfur amount in pellets,therefore increase sulfur content of iron nuggets.