Influência de dispersantes nas propriedades reológicas e coloidais de partículas ultrafinas de minério de ferro e seu efeito

Abstract:

The use of binders for iron ore pelletizing is required to: (1) increase the pellet strength before heating (green strength); (2) prevent the collapse of the pellets during firing, when the gases generated by water vaporization could create cracks. Bentonite is the main binder used in industry, and binding mechanism in iron ore pellets has been widely studied and understood. Efforts to solve the problems of using bentonite in iron ore pelletizing have focused on the employment of organic binders which composition presents dispersant properties. This review critically evaluates the current understanding of the influence of dispersants on the quality of iron ore pellets, by means of their action on the colloidal and rheological properties of iron ore ultrafine particles. Emphasis is given on obtaining parameters for practical application of this action in the pelletizing process in bench and pilot scales.


Reference:
MORAES, Sandra Lúcia de; LIMA, José Renato Baptista; FERREIRA NETO, João Batista. Influência de dispersantes nas propriedades reológicas e coloidais de partículas ultrafinas de minério de ferro e seu efeito no processo de pelotização : uma revisão. In: INTERNATIONAL CONGRESS ON THE SCIENCE AND TECHNOLOGY OF IRONMAKING, ICSTI, 6.; ABM IRONMAKING SEMINAR, 42., ABM IRON ORE SYMPOSIUM, 13., 2012, Rio de Janeiro. Proceedings…. 11p.

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