炼钢污泥对造球的作用及其替代膨润土比例的研究

Experimental Research on Function of Steelmaking Sludge in Pelletizing and Its Substitute Ratio for Bentonite

实验室试验表明,配加炼钢污泥能够改善生球质量,随炼钢污泥配比的增加,生球落下强度和抗压强度增加;未充分粉碎、分散的小污泥块粒对实验室间断式造球的成球率影响显著,但少量小污泥块粒的存在可以作为母球促进工厂造球生产;在造球生产中污泥可以部分替代膨润土,根据试验求得的回归方程计算出目前济钢球团原料条件下的替代比K为4.77倍;润磨工艺对含有炼钢污泥的混合料造球及生球质量有显著的改善作用,能够提高生球落下强度、抗压强度和成球率。

The laboratory experiment shows that the addition of steelmaking sludge can improve quality of green pellet, with the increasing proportion of steelmaking sludge, the green pellet drop index and compression strength increase; The notfully crushed and scattered small sludge has remarkable effect on degree of laboratory bailing in batcher, but the existence of small amount of sludge can be used as nucleus particle to promote plant bailing production; Sludge can substitute bentonite in pelletizing production, based on the regression equation derived from experiment, it is calculated that the substitute ratio K is 4.77 under the raw material conditions of Jigsteel pellet plant; The damp milling process can remarkably improve the green pellet and pelletizing with the mixed material containing steel-making sludge, it can also increase green ball drop index, compression strength and bailing degree.