Optimization of Capillary Forces of Clutching Particles in Iron Ore Materials Granulation

抄録

Optimization of the operating modes of the pelletizing drum requires the study of the physical processes occurring inside the granules. The purpose of this work is to develop a recommendation for improving the quality of the pelletizing of the charge based on the study of the forces of capillary interaction of particles in granules of granular agglomerate.

A deterministic model of capillary adhesion of two particles of arbitrary size and properties based on the calculation of the geometric parameters of the liquid meniscus has been developed. Taking into account the size of the system and to simplify the calculation of the interaction of particles of the sinter batch, the meniscus is represented by a body of revolution with a spherical concave surface.

The interaction of 3 mm and 0.1 mm fractions with an average wetting angle θ = 25° for equilibrium states according to the degree of water filling W_0.1/3 = W_0.1/0.1 and adhesion forces F_0.1/3 = F_0.1/0.1 was researched. A value of the degree of filling the meniscus W_opt is lower than the optimal values of W for particles with a particle size of R₂/R₁ = 0.1/0.1 and R₂/R₁ = 0.1/3, therefore, one should assert not about the optimal degree of filling the meniscus, but about the optimal range of degree filling the meniscus from W_opt = 0.086 to W_0.1/3 = 0.21.