基于生石灰吸水性的适宜烧结制粒水分

为了有效发挥生石灰在制粒过程的作用,依据生石灰的吸水特性对烧结料制粒水分进行优化,是值得深入研究的工艺技术问题。考察了固定量配水、满足生石灰完全消化的配水,以及满足生石灰湿容量的配水等3种加水量选取方式,对烧结混合料制粒效果的影响。研究结果表明:烧结制粒过程中生石灰的吸水,一方面消耗于生成Ca(OH)2的化合水,另一方面还包括生石灰消化后自身吸收的物理水,二者影响烧结料的水分含量及分布;当制粒水分满足化合水消耗时,虽然烧结料水分得以保证,但消石灰和CaCO3吸水会争夺铁矿粉中的水分而影响制粒效果;当制粒水分满足生石灰湿容量时,可获得适宜烧结制粒水分,使铁矿粉中的水分得以保证,生石灰改善制粒的作用充分发挥。

Proper Water Addition for Sintering Granulation Based on the Water Absorbing Characteristics of Quicklime

In order to make better use of quicklime during sintering granulation, it′s worthwhile to have further researches on optimizing granulation water of sintering mix based on the water absorbing characteristics of quicklime. The influence of three different granulation water addition ways were investigated, which were constant water addition, water addition based on hydration of quicklime and water addition based on water absorbing characteristics of quicklime. The results show that water consumptions of quicklime during granulation include chemical water consumed in hydration into Ca(OH)2 and physical water absorbed by quicklime after hydration. Both of them have effect on content and distribution of water in sintering mix. In the case of water addition based on the hydration of quicklime, the physical water absorbed by quicklime after hydration has a negative effect on granulation for the competition of water and finally caused water shortage in iron ore, though moisture in sintering mix can be ensured. When the water addition is accordance with water absorbing characteristics of quicklime, the proper granulation water is obtained so that moisture in iron ore can be ensured, the granulation of sintering mix is improved a lot as a result.