Structure Model of Granules for Sintering Mixtures

• Published in: Journal of iron and steel research, international international, 2014-10, Vol.21 (10), p.905-909
• Main Authors: YUAN, Li-shun, FAN, Xiao-hui, GAN, Min, YANG, Gui-ming, WANG, Yi
• Format: Article
• Language: English
• Subjects: Adhesives; Applied and Technical Physics; Engineering; Granular materials; Granulation; Granules; Iron and steel industry; iron ore sintering; Machines; Manufacturing; Materials Engineering; Materials Science; Metallic Materials; Moisture content; Nuclei; Physical Chemistry; Processes; Raw materials; Sintering (powder metallurgy); structure model; 水分含量; 混合物; 烧结; 石灰活性; 粉状胶粘剂; 结构模型; 边界值; 颗粒组成
• ISSN: 1006-706X; 2210-3988
• DOI: 10.1016/S1006-706X(14)60160-6

Structure model of granules, boundary value of nucleus and powder, and the relationship between granula- tion efficiency and boundary value were investigated. Granules of sintering mixtures are composed of adhesive powder and nucleus. In the mixtures, particles larger than 1.00 mm act as nucleus and particles smaller than 0.25 mm act as adhesive powder. Particles with size between 0.25--1.00 mm can be adhesive powder as well as nucleus depending on the granulation conditions. When the boundary value is close to 0.25 mm, the granulation efficiency is lower than 50%. When the boundary value is close to 1.00 mm, the granulation efficiency is above 90%. The boundary value is influenced by the iron ore type, granulation moisture, fineness of raw materials and burnt-lime activity. Good adhe- sive capability, suitable moisture content, appropriate particle size distribution and high burnt-lime activity make the boundary value move towards 1.00 mm and improve the granulation efficiency.