Use Of Limestone In The Form Of Pulp With Dispersing On The Cold Agglomeration Of Mix With Pellet Feed For Sintering

This paper shows an evaluation about effect of dispersant sodium silicate along to limestone, in the form of pulp, on the cold agglomeration process for iron ore sintering. Before that, it was verified the effect of pH, solids content and amount of dispersant on the stability of the system (limestone, water and sodium silicate). It was found that the lower the solids content, the more alkaline pH and the amount of sodium silicate equal to 20 l for each 1t of limestone, was the level of dispersion of the system. The influence of the limestone pulp with dispersant depended on the granulometry of the ore mixture and the type of technological route. For the thinner type (42,8% <0.15mm), the limestone pulp with dispersant reduced the resistance of the adherent layer of the cold agglomerates, regardless of the technological route. However, for the coarser type (24,7% <0.15mm), the limestone pulp with dispersant increased the average size of the aggregates, preserving the resistance of the adherent layer when manufacturing with two intensive mixers in series.