提高球团矿冶金性能的措施

Measures to Improve the Metallurgical Properties of Pellet

高炉在冶炼过程中,通过各阶段的还原反应,脱离出铁料中的氧,从而生成游离态的金属铁。为确保高炉炉况顺行,要求球团矿的冶金性能必须良好,即热强度(即还原后强度)和膨胀率均应满足高炉需求。同时为强化冶炼,提高炉内透气性,需要球团矿的软熔温度高、软熔区间窄。因此,广大球团工作者以高炉需求为导向,通过在生产实践中不断摸索经验,采取稳定焙烧温度、控制温升速度及焙烧时间、提高氧化气氛、确定合理的生球粒度、减少硫等有害杂质的含量、适当加入MgO、CaO等添加剂,有效提高了球团矿的冶金性能,增加了球团矿的附加值,为高炉的炉况稳定顺行创造了条件。

In the smelting process of blast furnace,the oxygen in the tapping material is separated through the reduction reaction in each stage,so as to produce free metal iron.In order to ensure the smooth operation of blast furnace,the metallurgical performance of pellet must be good,that is,the thermal strength(i.e.strength after reduction)and expansion rate should meet the needs of blast furnace.At the same time,in order to strengthen smelting and improve the permeability in the furnace,the soft melting temperature of pellets is high and the soft melting range is narrow.Therefore,the majority of pelletizing workers are guided by the demand of blast furnace.Through continuous exploration of experience in production practice,they take measures to stabilize the roasting temperature,control the temperature rise rate and roasting time,improve the oxidation atmosphere,determine the reasonable green pellet particle size,reduce the content of sulfur and other harmful impurities,and appropriately add additives such as MgO and Cao,which effectively improve the metallurgical properties of pellets and increase the added value of pellets,so as to create conditions for stable and smooth operation of blast furnace.