Compressive yield stress of flocculated suspensions: Determination via experiment

Journal Article · Thu Aug 01 04:00:00 EDT 1996 · AIChE Journal

DOI:https://doi.org/10.1002/aic.690420820· OSTI ID:367867

Green, M D; Eberl, M; Landman, K A ^[1]

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1. Univ. of Melbourne, Parkville, Victoria (Australia)

The compressive yield stress P{sub y}({phi}) is an extremely useful parameter for the characterization of concentrated flocculated suspensions. It is a measure of the strength of interparticle bonds in a networked suspension structure and is used in process design and control of mineral colloidal suspension dewatering. Previous work developed a method for determining this compressive yield stress via the equilibrium sediment height technique using a centrifuge. Here justification for a simple approximate technique to obtain P{sub y}({phi}) is discussed. A new more accurate iterative algorithm is also described. By generating synthetic data, where the exact P{sub y}({phi}) is known, the accuracy of the two techniques can be evaluated properly for the first time. The relative merits and failings of the techniques are discussed. An example is given to show how these techniques work on real experimental data. Superthickeners and deep cone thickeners have made a particular impact in environmental waste minimization in the alumina industry. Compressional rheology plays an important role in the design and control of solid-liquid separation processes.

• OSTI ID: 367867
• Journal Information: AIChE Journal, Journal Name: AIChE Journal Journal Issue: 8 Vol. 42; ISSN 0001-1541; ISSN AICEAC
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
CERAMICS INDUSTRY
COMPRESSIBILITY
DESIGN
DEWATERING EQUIPMENT
FLOCCULATION
SEPARATION EQUIPMENT
SUSPENSIONS
WASTE MANAGEMENT
WATER REMOVAL
YIELD STRENGTH