Effect of surface properties of iron ores on their granulation behavior
The granulation property of iron ores was generally influenced by their wettability,surfaceroughness and shape of the iron ore.In this study,the surface roughness and shape of iron ores were characterizedby the ratio of BET specific surface area ( SBET) to specific surface area ( SLS) calculated using size distributionobtained by a laser diffraction method.Wettability of ores was characterized by measuring the contact angle ( 0)between iron ore and water.Bed permeability was used as an evaluation index of granulation effect.A variety ofmaterials were subjected to a granulation test under an actual production condition.Special attention was paid tofour ores with different surface properties and wettabilities.Nine groups of mixtures were obtained by linearprogramming taking the basicity as the objective function.Granulation results showed that the optimum bedpermeability of nine mixtures have a good linear relation with mass fraction of four ores studied.Slopes ( k) offitting lines were used to characterize the granulation properties of ores,binary linear regression equation wasderived with the k used as dependent variable,0 and SBL7-/SLS used as independent variables :k = 16.443 - 0.277 x0 + 0.058 x ( SBEI-/SLS),Granulation performance of iron ore gets better with decreasing the contact angle andincreasing the ratio of SBEI to SLS.
granulation property surface roughness wettability permeability
ZHANG Rende HUANG Xiaobo JI Changyang LV Xuewei BAI Chenguang
College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China
国内会议
上海
英文
1-7
2013-06-01（万方平台首次上网日期，不代表论文的发表时间）