Improving the Pelletization of Refractory Hematite by High Pressure Grinding Rolls
In this paper High Pressure Grinding Rolls(HPGR) was utilized to pretreat CVRD southern specular hematite for enhancing the pelletization of the refractory hematite. The process parameters of HPGR, bailing and firing were optimized, and the mechanism of HPGR was demonstrated by determining the surface activity by means of Blaine specific surface area tester, laser size analysis,scanning electron microscopy (SEM),X-ray diffraction (XRD), micro calorimeter and pelletability index.It is shown that the pelletization of the refractory hematite was greatly improved, The drop strength of green balls increases from 3.4 times to 13.6 times from 0.5m height while the bentonite dosage decreases from 2.2% to 1.3%.The compressive strength of roasted pellets also reaches 2500N/pellet. The mechanism of the pretreatment of CVRD southern specular hematite concentrates by HPGR is revealed that the surface activity is improved by an increases in specific surface area and the amount of micron size fractions, and higher lattice deformation and defects due to the fractures occurring inside particles during static pressure comminution, resulting in more wetting enthalpy, higher pelletability index and good property of roasting.
High Pressure Grinding Rolls Refractory hematite Pelletizing
J. Pan D. Q. Zhu S. A. Xiong V. Mendes
Department of Iron and Steel, Central South University, Changsha, China Wuhan Iron and Steel Co., China Marketing and Business Development, Vale Asia Corporation - Shanghai Office, Shanghai, China
国际会议
XXIV International Mineral Processing Congress(第24届国际矿物加工大会)
北京
英文
2857-2865
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）