Determining an appearance function for compressed bed breakage

A well-validated HPGR model exists and is incorporated in the widely-used software program JKSimMet. However, one of the weaknesses of the model is the lack of 'real' ore characterisation data to simulate and predict industrial-scale HPGR performance from laboratory or pilot scale tests. This paper describes a procedure to obtain accurate compressed particle bed breakage data using a piston and die test investigated as a part of the AMIRA P9 Project. The results of this test have been found to differ from drop weight test results. Having this accurate relationship between the specific energy input and the degree of breakage will result in more realistic HPGR modelling and scale-up

Simultaneous determination of collection zone rate constant and froth zone recovery in a mechanical flotation environment

In this experimental study, the new JKMRC Flotation Cell was used to determine the collection zone rate constant and froth zone recovery of a copper rougher ore simultaneously. Experimental work was carried out using a copper rougher ore with a P of 200 μm. Operating variables such as air flow rate, impeller speed, feed percent solids, collector and frother dose, and wash water flow rate were investigated. Analysis of copper and iron minerals was carried out. Overall, the possibility of measuring both the collection zone rate constant and froth zone recovery simultaneously and continuously in a mechanical flotation environment was proven

Effect of frother type and concentration on the water recovery and entrainment recovery relationship

A study was undertaken to determine the effects of five industrial frothers on the relationship between entrainment recovery and water recovery. The experiments were conducted using a Batequip rectangular 60-L steel flotation cell that was run in parallel with the first cell in a copper/silver prefloat rougher circuit. The concentration of the frothers ranged from 2.5 to 8.4 g/t. The experiments were repeated at three different froth depths. A power function was found to fit this relationship with no discontinuity in the relationship caused by the changes in frother type and concentration and froth depth

Modelling of froth transportation in industrial flotation cells: Part I. Development of froth transportation models for attached particles

Modelling of froth transportation, as part of modelling of froth recovery, provides a scale-up procedure for flotation cell design. It can also assist in improving control of flotation operation. Mathematical models of froth velocity on the surface and froth residence time distribution in a cylindrical tank flotation cell are proposed, based on mass balance principle of the air entering the froth. The models take into account factors such as cell size, concentrate launder configuration, use of a froth crowder, cell operating conditions including froth height and air rate, and bubble bursting on the surface. (C) 2004 Elsevier Ltd. All rights reserved