Comminution Of Ore Research Articles

Hierarchical Properties of Particle Shape for the recognition of powdered materials

AbstractParticle shape recognition procedures can be used to determine constituent materials. The problem of recognizing the association between the shape and mineralogical composition of a particle, resulting from comminution of a raw ore, is of great interest.An algorithm is presented and computational results are given for the classification of particles of iso‐proportional constituents. In this way, the washability function of a set of particulate raw ores can be estimated by taking into account only the contour of the particles. This classification procedure is useful when there are difficulties in the estimation of some relevant properties such as specific gravity or magnetic susceptibility.The procedure has been successfully applied to the recognition of the mineralogical composition of particles resulting from the comminution of a chromite ore and to the classification of particles in iso‐composition classes.

Size characteristics of the products of the commercial comminution of ore

where M is the mass of ore in the mill, tons; Qinl, QM, QG, Qg are the productivities with respect to the initial ore, in the discharge of the mill, with respect to the gravel, and with respect to the output of grading, tons/h; Yini(~), yM(1), yG(Z), yg(~) are the differential grain-size characteristic of these products; eg (~) is the grading-efficiency characteristic; qrel(R, [) is the relative rate of formation ot the fine classes r from the coarse classes R, (h-mm) -I. In the first relation of the system in Eq. (I), the right,hand side characteritizes the productivity of the mill with respect to a narrow class.

The Application of Spherical Agglomeration to the Fractionation of A Tin-Containing Ore

Abstract Described here is the upgrading of tin is described a naturally occurring ore by selective densified aggregation. Improvement factors as large as 25 with good recoveries have been obtained in a single step using fatty-acid-type activators and liquid petroleum bridging liquids. The agglomeration takes place simultaneously with the comminution of the original ore in conventional grinding equipment. Further fractionation steps should be possible.

The Application of Spherical Agglomeration to the Fractionation of A Tin-Containing Ore

Described here is the upgrading of tin is described a naturally occurring ore by selective densified aggregation. Improvement factors as large as 25 with good recoveries have been obtained in a single step using fatty-acid-type activators and liquid petroleum bridging liquids. The agglomeration takes place simultaneously with the comminution of the original ore in conventional grinding equipment. Further fractionation steps should be possible.