An investigation on laboratory Knelson Concentrator separation performance: Part 1: Retained mass modelling

作者：Ghaffari Ali; Farzanegan Akbar^*

来源：Minerals Engineering, 2017, 112: 57-67.

DOI：10.1016/j.mineng.2017.07.006

• Knelson Concentrator
• Centrifugal gravity concentration
• Modelling retained mass
• Weibull model

The retained mass of material in the Knelson Concentrator (KC) bowl depends on the main forces-the fluid drag force (F-d), the centrifugal force (F-c), and the buoyancy force (F-b)-which act on the particles in the concentrating bowl. They are functions of the material properties, as well as the operating condition parameters. In this experimental study, the fluid drag force (Fd) experienced by a solid particle in the rotating bowl was estimated by the fluidization water pressure (P-w) multiplied by the projected area (A(p)) of a spherical particle hydraulically equivalent to the solid particle, and used in the model fitting. Quartz, magnetite, zinc, copper, and lead powders were used in different sizes as minerals with the same density to investigate and model the retained mass of material in the KC bowl. By defining the new ratio of F-d/(F-b-F-b), the retained volume of the different materials in the KC bowl was modelled, and it was shown to be the same for a given value of F-d/(F-b-F-b) ratio. Based on the developed experimental database consisting of 284 tests, a Weibull model was proposed. It can accurately model the retained mass of material in the KC bowl for particles with various sizes and densities under a given operating condition.

• 出版日期2017-10