Filter press dewatering process: Analysis of the physical-chemical features that affects the cake build-up

F. Kaswalder*, D. Collini, A. Grosso, N. Finocchiaro, Aqseptence Group s.r.l.; A. Paglianti, University of Bologna, Italy

Optimization of the pressure filtration process can be a big challenge. Filter presses are nowadays very popular in different industrial sectors (i.e. mining), where are required demanding performances in term of slurry dewatering and extremely high solid throughput.

Filter presses are very effective and versatile machines, where many different variables give a fundamental contribution to optimize the various steps of the process: feeding and filtration, consolidation by membrane squeezing, desaturation by air blowing, deliquoring by cake washing...

The understanding of the main factors that control the cake build-up is mandatory to get a proper control of the process: it should be considered as the starting point of each case study, and more and more the golden rule to predict and tune the achievable performances.

It the present work, the results of a study regarding dewatering performances on a number of quarry tailings are presented. Often these slurries show low filterability due to their chemical composition and their very fine solid fraction, and little variations in these characteristics lead to big changes in the filtration performances (e.g. filtration time or cake dryness).

The samples have been characterized by means of a series of physical-chemical techniques, like laser particle size distribution, X-rays mineralogical and elemental spectroscopy methods, and the pressure filtration process has been simulated using a bench scale filter press. The results show that...

Session: L11 - Discontinuous and Continuous Press Filters
Day: 14 March 2018
Time: 16:45 - 18:00 h

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