高硅镁质熔剂性球团成球过程及冷态性能实验

Experimental study on spherication and cold performance of high-silica magnesium flux pellets

生球质量的好坏是直接关系到企业是否顺利生产高质量熔剂性球团的前提。为探明SiO2、碱度及MgO含量对生球性能的影响规律,以唐钢生产所用3种磁铁矿为原料,通过添加生石灰调节碱度,添加白云石调节MgO含量,配比3种铁矿粉调节SiO2含量,进行了造球及生球冷态性能的试验。研究发现,无论是改变SiO2、碱度还是MgO含量,其生球适宜水分基本都保持在8%~9%(质量分数)之间。生球的成球率维持在90%以上,成球率良好。生球的抗压强度、落下强度的大小以及爆裂温度的高低,主要受铁矿粉及熔剂的粒度组成、物理性能以及生球适宜水分大小的影响。

The quality of green pellet is directly related to the production of high-quality fluxing pellets. In order to find out the effect of SiO2, basicity and MgO content on the performance of green pellets, the experiments of pelletizing and cold performance of green pellets were carried out with three kinds of magnetite as raw materials, by adding quicklime to adjust basicity, adding dolomite to adjust MgO content and proportioning three kinds of iron ore powder to adjust SiO2 content. It is found that regardless of changing SiO2 content, alkalinity or MgO content, the suitable moisture for green pellet is basically maintained between 8 mass% and 9 mass%. The pelleting degree of green pellet is above 90%, and pelleting deg is good. The compressive strength, dropping strength and bursting temperature of green pellets are mainly affected by the particle size, physical properties and suitable moisture content of iron ore powder and flux.