Solid-Liquid Suspensions

The Dorr agitator (Coulson and Richardson, loc. cit.) consolidates in one unit the principles of the thickener and the Pachuca tank. Resembling a rake-equipped thickener, it differs in that the rake is driven by a hollow shaft through which the solids-liquid suspension is lifted and circulated by an air stream. The rake moves the pulp to the center, where it can be entrained by the air stream. The unit may be operated batchwise or continuously. 

Ayazi Shamlou P (1993) Processing of solid-liquid suspensions. Butterworth Heine-mann, London... 

Di Felice, R. Solid Suspension in Liquid Fluidized Beds in Processing of Solid-Liquid Suspensions, Shamlou, P.A. (Ed.), Butterworfh-Heinemann Boston, 1993, pp. 246-272. 

Shamlou, P.A. (Ed.) Processing of Solid-Liquid Suspensions, Butterworth-Heinemann Boston, 1993. 

Shamlou, P. A., and Titchener-Hooker, N., Turbulent aggregation and breakup of particles in liquids in liquids in stirred vessels, in "Processing of Solid-Liquid Suspensions" (P. A. Shamlou Ed.), pp. 1-25. Butterworth-Heinemann Ltd, Oxford (1993). 

A dispersion is a system consisting of two or more phases in which a material is finely distributed throughout another. Dispersions can be liquid/liquid (emulsions) or solid/liquid (suspensions). Polymer dispersions consists of an internal phase, the polymer or copolymer and an external phase, water. 

Most of the early experimental investigations were performance studies concerned with the homogeneity of solid-liquid suspensions or with the rate of solution of solid particles as related to various operating characteristics. This class of systems has not been studied to any extent from a fundamental standpoint the following sections will indicate the large regions of interest which remain to be investigated. 

What is the consistency of the sample (solid, liquid, suspension, etc.) ... 

Calculation of the Just-Suspended Impeller Speed, A/js, in Solid-Liquid Suspensions... 

Impeller Froude number = N D/g Modified impeller Froude number at Ajs for solid-liquid suspensions [Pl/(Ps Pl)1 Nf D/g... 

Impeller Reynolds number = pND /p Impeller Reynolds number at Vjs for solid-liquid suspensions = Nj D /v Particle Reynolds number in a turbulent... 

Brucato, A. Rizzuti, L. In The Application of the Network-of-Zones Model to Solid-Liquid Suspensions, Proceedings 6th European Conference on Mixing, Pavia, Italy, 1988 273-280. 

Solid-liquid separation systems generally consist of four stages including pretreatment, solid concentration in thickeners, solid separation in filters or centrifuges, and post-treatment by expression and washing operations. There are different types of SLS equipment served for different functions in relation to the four stages. Product specification, characteristics of solid-liquid suspension, solid settling velocity, rate of cake... 

Fan F-S, Tsuchiya K (1990) Bubble Wake Dynamics in Liquids and Solid-Liquid Suspensions. Butterworth-Heinemann, Boston... 

Esmaeeli A, Ervin E, Tryggvason G (1994) Numerical simulations of rising bubbles. In Blake JR, Boulton-Stone JM, Thomas NH (eds) Bubble Dynamics and Interfacial Phenomena. Kluwer Academic Publishers, Dordrecht Esmaeeli A, Tryggvason G (1996) An Inverse Energy Cascade in Two-Dimensional Low Reynolds Number Bubbly Flows. J Fluid Mech 314 315-330 Fan F-S, Tsuchiya K (1990) Bubble Wake Dynamics in Liquids and Solid-Liquid Suspensions. Butterworth-Heinemann, Boston Fick A (1855) Ueber Diffusion. Ann der Physik 94 59-86 Scott Fogler H (2006) Elements of Chemical Reaction Engineering. Fourth Edition, Prentice-Hall International, Inc, New Jersey... 

The choice of impeller for three-phase systems is a compromise between dispersing gas in the liquid and suspending the particles in the liquid. We recall that the axial-flow impellers are usually used for solid-liquid systems, while radial impellers are used for gas-liquid systems. Introducing gas from the bottom of a tank containing a solid-liquid suspension will destroy the flow pattern created by an axial impeller. Therefore, radial impellers are usually more effective in three phase systems even if they require more power for the same level of suspension [65]. Another solution is to apply multiple impellers, one to fulfill the criterion for gas dispersion and another one to fulfill the criterion for solids suspension [87]. The existence of solid particles might also modify the interfacial area between gas and liquid compared to gas-liquid systems. 

Gale, R.S. and Baskerville. R.C.. Capillary suction method for determining of the filtration properties of a solid/liquid suspension, Chem. Industry, 355. 1967. 

Coating development in the preceding Chapter 5.3.1 on APS can be described as the result of injecting the solid precursor powder by a stream of accelerated (inert) gas into the plasma jet, whereas SPS uses an injected liquid as the powder carrier (Figure 5.29). The introduction of the powder material into the plasma jet in form of a solid-liquid suspension via an atomizer allows the utilisation of very... 

Barnes, H. A. Holbrook, S. A. In Processing of Solid-Liquid Suspensions Ayazi Shamlou, P., Ed. Butterworth-Heinemann Oxford, U.K., 1993 pp 222-245. 

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