Abstract
The Knelson concentrator is a centrifugal separator which was originally and successfully designed for extracting free gold particles. Despite of its wide range of applications, the exact concentration mechanism of the device is not fully understood. The purpose of this research was to determine the optimum parameters and improve the performance of knelson concentrator by investigating the effects of artificial porous beds and pulsed water jackets on the performance of the device. Artificial bed consists of glass beads of range 1.5-2 mm diameter have been used. It was found that two techniques can improve the performance of the batch Knelson concentrator. The experimental work showed that improvement ratio of concentrator was increased about 1.55 for flow rate 8 l/m compared with no bed for the same flow rate. In addition, the improvement ratio was increased about 1.25 when pulsed water was used. Another purpose of this work was to develop mathematical model approaches to understand the fundamental mechanism of the Knelson concentrator. In addition, two mathematical model of the Knelson concentrator have been developed. Key words: Kneslon Concentrator, Pulsation, Porous Bed, Mathematical Model
Highlights
This study showed that artificial beds can significantly improve the separation performance of the Knelson concentrator
It was found that creating an artificial porous bed in the rings of the concentration bowl could significant improve the grade of the concentrate
Using pulsed water with beds can improve the grade as well; the improvement ratio achieved in this case was about 1.25
Summary
The Knelson Continuous Variable-Discharge Concentrator (CVD6) [1] shown in Fig.(1-1) was developed to address specific mineral recovery applications which are suitable to enhanced gravity separation but, due to comparatively high content of target mineral, are not practical for conventional batch concentration methods. The Knelson concentrator CVD6 is the only continuous-type centrifugal concentrator available that utilizes Knelson's widely proven patented fluidization technology. The continuous-type technology differs from the batch-type technology by delivering a continuous stream of concentrate. The CVD6 will discharge the concentrate while simultaneously processing fresh feed, whereas batch-type units must be stopped intermittently to remove concentrate. Continuous-type Knelson Concentrators are suited to applications where the target mineral exceeds 0.5% of the total feed solids
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