MEASUREMENTS AND MODELS FOR THE GRAVITY CONCENTRATION OF CD WASTE THROUGH JIGGING

摘要

The process of gravity concentration through jigging is known since centuries and is used mainly in the mining and gravel industry. In the last few years a fresh impetus was given to this method by the (forced) recycling of building materials and other wastes. With these new fields of application of the jigging process open up. The insufficient state of knowledge about the wet gravity concentration and the application of the process for changed problems were the reason for this research work. The aim was to capture the current state of knowledge in the field of gravity concentration, to generate experimental data and to develop a mathematical model for the prediction of jigging results and for the design of jigs. During the current research work the jigging was realized in order to investigate the influence of the waveform of the pulsation on the stratification. The experiments were carried out on a test track especially made for this research work. Mainly symmetrical and asymmetrical vibrations with a fast acceleration phase and a slow phase of consolidation were used. The generated data form the basis of the model, which will be represented in the lecture. It can be shown how the stratification can be modelled and how therefore jigging processes can be predicted and optimized.