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Showing 1 to 11 of 11 for “"Solids suspension"”.
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The evaluation of solids suspension in a pilot scale mechanical flotation cell
… step in flotation is particle collection, with solids suspension together with gas dispersion and reagent mixing as necessary preconditions for particle collection. Solids suspension is therefore often identified as an important subprocess for effective flotation. Yet, surprisingly little work …
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Experimental determination of solids suspension with angled impeller in a pharmaceutical mixing vessel
… is that they are capable of suspending small solids dispersed in the liquid. Therefore, it is critical to know the value of the minimum agitation speed at which solids become just suspended,N_{js}. Despite their common use in industry, and especially the pharmaceutical industry, these systems …
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Experimental determination of the agitation requirements for solids suspension in dissolution systems using a mini paddle apparatus
… the determination of the fraction of unsuspended solids in the vessel at different agitation speed (N_{js}-D_s method). The results of this method agree well the visually observable values of N_{js}(N_{js-visual}). Once new method was validated in mini vessels, N_{js} was experimentally measured …
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Effect of impeller submergence on power dissipation and solids suspension in mixing systems equipped with pitch-blade turbines
Mixing and dispersion of solids in a liquid is a process frequently encountered in the pharmaceutical industry and often conducted in cylindrical baffled tanks stirred by mechanical impellers. In operations where the liquid level is decreased (as often which emptying the tank) the process must be …
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Novel experimental method for the determination of the minimum agitation speed for solids suspension in flat-bottomed stirred tank reactors
… speed, Njs, required to suspend finely divided solids in vessels stirred by an impeller is a critical parameter to properly operate industrial tanks in a large number of industrial operations. The most common experimental approach to measure N_{js} is that of Zwietering’s (Chem. Eng. Sci., 1958, …
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A hydrodynamic study of nickel suspension in stirred tanks
… been dedicated to low density particles at low solids concentrations. In the present work, computational fluid dynamics (CFD) simulation and experimental methods were employed to study suspension of high density particles (nickel) at high solids concentration in water. The work first focused on …
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The effect of non-biological particulates on microbial cell disruption in a slurry bioreactor
… effect of incompletely and completely suspended solids on the kinetics of cell disruption, as a function of the solids concentration, agitation intensity and impeller flow pattern. Saccharomyces cerevisiae was used as model micro-organism and silica as the solid particles. Modelling the cell …
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Concurrent evaporating spray jets in dilute gas-solid pipe flows
Evaporating spray jets into gas-solids suspensions are encountered in many industrial applications. The rapid evaporation of spray jets has significant effects on the gas-solids mixing near the jet nozzle regions, including non-uniform solids concentration dilution, gas/solids temperature …
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Injection Impairment by Suspended Solids: Well Models, Filtration Parameters, and Models’ Validation with 3-D Injection Experiments
… loss of injectivity. Water injection, without solids suspension, at high velocity generates a loss of injectivity as a non-Darcy flow effect. The compounding impacts of high injection fluid velocity with suspended solids are expected to produce more severe injectivity loss than water alone. The …
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Hydrodynamics and gas dispersion in industrial flotation cells
Solids suspension and gas dispersion studies were performed on a total of 40 industrial flotation cells of various types, sizes and duties in a Platinum Group Metal (pgm) concentrator in the North West Province of South Africa. The wide variety of cells studied included a Bateman 3-m³ cell, …
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Single and multiphase mixing in partially filled stirred vessels
… in a single liquid phase and in solid-liquid suspensions. Flat-bottomed, baffled vessels (5L, 12L, 20L and 170L) equipped with a single disk turbine (DT) of four different sizes placed at five different impeller off-bottom clearances were used here to study the system's hydrodynamics and …