MANUFACTURE OF LOW-SLAG SINTERED ORE ENABLING HIGH BLEND OF ORE WITH HIGH ALUMINA CONTENT

摘要

PURPOSE:To accelerate the rapid formation of a melt and enable an increase of the Al2O3 content of sintered ore by controlling the Al2O3 and SiO2 contents of the fine powdered part of a predetermined grain size or below in blended starting material. CONSTITUTION:Blended starting material contg. =5.4wt% SiO2 as the SiO2 content of sintered ore and contg. a fine grain part of 1mm. grain size by =25wt% is prepared, and the SiO2 and Al2O3 contents of the material are held so as to increase the SiO2 content of the fine powdered part of 0.25mm. grain size in the material and reduce the Al2O3 content. That is, the amount of SiO2 contained in said powdered part is adjusted to 0.85wt% of the total amount of the components constituting the blended starting material, and the weight ratio of Al2O3/SiO2 to =0.25. The material is then sintered. As a result, using ore with high Al2O3 content, sintered ore with low SiO2 content is obtd. without lowering the quality and productivity of the sintered ore.