Surface performance of carboxy methyl amylopectin for
improving strength of pellet①
improving strength of pellet①
(Department of Mineral Engineering, Central South University of Technology,
Changsha 410083, P.R.China)
Changsha 410083, P.R.China)
Abstract: Using synthesized carboxy methyl amylopectin as organic binders for pelletizing, the dry pellet compressive strength goes up to 322.8 N per ball, dropping strength is 6.67 times per 0.5m, and the green pellet shock temperature reaches up to 820℃. The influence of the carboxy methyl amylopectin on the contact angle of iron ore surface was investigated. Compared with that having no organic binder, the surface tension increases 48 times and the capillary attraction increases 43 times. These results were obtained by using the quasi-particulate model calculation. The analysis demonstrated that the behavior of polar group and organic chain structure are the reasons of improving the strength of pellet. XPS analysis indicated that polar group bonded on iron ore surface make the electron energy of 2p orbit of Fe decreases from 711eV to 710.2eV. The results showed that the special spatial reticular structure of organic chain can improve pellet strength and green ball shock temperature.
Key words: pellet; organic binder; surface action; pellet strength.