Iron Ore Fines Granulation in a New High Speed Mixing Granulator

A new type of mixing granulation equipment is proposed, which can improve the mixing degree of raw materials, improve the granulation efficiency, and have the function of “self-purification”. The results show that the particle size is uniform and chemical composition segregation of particles is decreased after granulation. The strength of the granules can be effectively improved to control the particle size distribution of the particles. With the rotational speed increasing, the particles of +10 mm increase and the fractions of −1 mm are few. As the rotational speed is 70 rev. min⁻¹, the median particle size D (50) of granules is the maximum value. The fractal dimension tends to decrease gradually with the increase of rotating speed. It indicates that the particle size distribution in the high speed stirring granulator is very concentrated. The particle size grading is very small and the fine powder particles mostly adhere to the mother particles.