烧结用生石灰所含杂质对其消化性能的影响

采用恒温量热法,针对实验室煅烧的各种生石灰试样,研究其所含SiO2、Al2O3、MgO等杂质对消化性能的影响规律,并选用烧结现场使用的五种生石灰对研究结果进行验证.研究发现:生石灰的消化放热量与其CaO含量呈正相关关系,并随SiO2、Al2O3和MgO含量的增加而下降;SiO2、Al2O3和MgO杂质对生石灰消化速率有重要影响,当SiO2质量分数增加至1％水平时,生石灰消化速率的降幅较大,之后则缓慢降低;少量的Al2O3对生石灰消化速率影响较小,但当Al2O3质量分数超过2％时生石灰消化速率急剧下降;随着MgO含量的增加,生石灰消化速率显著降低.

Effects of impurities in lime used for iron ore sintering on its hydration characteristics

The effects of SiO2,Al2O3 and MgO on the hydration of lime were investigated by isothermal calorimetry,and the results were validated by 5 types of lime used in the sintering plant.It is found that the total hydrating heat of lime has positive relationship with CaO content,and decreases with increasing SiO2,Al2O3 and MgO contents.The contents of SiO2,Al2O3 and MgO also have important effect on the hydrating speed of lime.When the mass fraction of SiO2 increases to 1％,the hydrating speed of lime dramatically decreases,and then slowly drops with increasing SiO2 content.A small amount of Al2O3 has no significant effect on the hydrating speed of lime,but when the mass fraction of Al2O3 is more than 2％,the hydrating speed of lime sharply decreases.With the increase of MgO content,the hydrating speed of lime significantly decreases.