Advances in the Theory and Practice of Hydrocyclone Technique
With numerical simulation of hydrocyclone separation based on the Navier-Stokes and mass transfer equations, it is possible to perform hydrocyclone experiments on a computer. With the help of computational engineering, the cost of conducting hydrocyclone experiments in the planning phase of new hydrocyclone units can be cut drastically. The simulation models also enable a deeper insight into the static and dynamic process behaviour in hydrocyclones. It is shown that the solids stored in the hydrocyclone represents a sensitive process variable for separation in the hydrocyclone. On this basis, a new control concept for a hydrocyclone battery has been developed. As the solids concentration in the feed increases, the combined overflow of all the hydrocyclones in the battery is throttled. At the same time, the feed pump speed is increased. In this way, while the total throughput remains constant, the volume split changes to effect that more solid material is discharged in the hydrocyclone underflow. This computer-based process control system is ideally suited for hydrocyclones in separation plants for tunnel driving projects as well as for those integrated closed-circuit grinding
Neue Entwicklungen zur Tonentwässerung
In terms of economy and technology, dewatering is of special significance for the processing of clay owing to the difficult raw material conditions. Particularly Amberger Kaolin-Werke have been involved intensively with this problem and in the past years have implemented a series of development projects. The knowledge gained during the improvement of their own operations can also be usefully applied by clients operating plants of AKW Apparate+Verfahren. The article reports on details of the developmental steps taken, such as improvement of preliminary thickening, optimising flocculant addition, application of high pressure filter presses and membrane filter presses C'est pour des raisons economiques et techniques que la deshydratation est devenue particulierement importante en ce qui concerne la preparation de l'argile, du aux proprietes des matieres premieres. La societe Amberger Kaolin-Werke a etudie ce probleme de facon approfondie, tout en effectuant ces dernieres annees de nombreux travaux de developpement. Les connaissances acquises au cours du perfectionnement de ses propres entreprises peuvent etre appliquees egalement aux entreprises des clients de AKW Apparate+Verfahren. Cet article informe sur les details des differentes etapes de developpement realisees jusqu'a present, comme par exemple le perfectionnement de l'epaississement preliminaire, l'optimisation de l'addition de floculants, l'emploi de filtres-presses a haute pression et de filtres-presses a membrane.
A Phenomenological Study of the Wind Band Experience: Stories of Band
A PHENOMENOLOGICAL STUDY OF THE WIND BAND EXPERIENCE: