yield stress thickeners

yield stress thickeners

Tailingsfo Thickened Tailings Storage   A discussion
Tailingsfo Thickened Tailings Storage A discussion

Thickened tailings, as the name suggests, involves the mechanical process of dewatering low solids concentrated slurry (Fourie 2003). This is normally achieved by using compression (or high rate) thickeners or a combination of thickeners and filter presses.

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Balancing Texture with Electrolyte Resistance for Improved
Balancing Texture with Electrolyte Resistance for Improved

Yield stress and yield strain of moisture gel As Figure 8 shows, the yield stress and strain of the sodium carbomer based moisture gel were significantly lower than those of the conventional carbomer, again showing that lighter and smoother formulations could be obtained using the sodium carbomer.

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Steady state thickener modelling from the compressive
Steady state thickener modelling from the compressive

Steady state thickener modelling from the compressive yield stress and hindered settling function Steady state thickener modelling from the compressive yield stress and hindered settling function Usher, Shane P.; Scales, Peter J. 2005 08 15 000000 An algorithm has been developed to predict steady state thickener operation from fundamental material properties, properly accounting for

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Thickeners + Rheology Guide
Thickeners + Rheology Guide

Thickeners + Rheology Guide. Rheology is defined as the study of the deformation and flow of materials. When a force is applied to . a liquid, the liquid will flow to relieve the strain from this force. Different systems will resist this flow more than others and the measurement of this resistance is a measure of the viscosity of the system.

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Steady state thickener modelling from the compressive
Steady state thickener modelling from the compressive

Example of compressive yield stress, Py (), curve fit using the The model assumes steady state thickener operation. asymptote and exponential power law functional form given by Eq. (4) with parameter values g = 0.15, pa = 27, pb = 1, pm = 20 and pn = 1.

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Thickeners + Rheology Guide   Scott Bader
Thickeners + Rheology Guide Scott Bader

a certain yield stress is reached. Beyond this point the ow is then that of a pseudoplastic uid. Pseudoplastic Texipol thickeners are supplied in a pre neutralised Scott Bader Thickeners + Rheology Guide

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Pulp, paste and putty thickeners and flocculants for high
Pulp, paste and putty thickeners and flocculants for high

Through shearing the slurry at least a fraction of the yield stress may be dissipated to lower the demand for pumping energy (Nguyen and Boger, 1985). Recirculation of the slurry through the underflow cone or boot of the thickener by pumping can break the floccules and lower slurry yield stress substantially.

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Flocculants and Rheology Modifiers for Paste Thickening
Flocculants and Rheology Modifiers for Paste Thickening

Yield Stress (P a) Underflow solid concentration % Direct Yield Stress (P a) % solids Conventional Dryfloc DX D DT DRYFLOC SU 13 E Conventional low anionic flocculant DRYFLOC SU A DT 4 The DRYFLOC P range of products is targeted at Preleach thickeners or Tails thickeners

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THICKENED TAILINGS RHEOLOGICAL AND GEOTECHNICAL
THICKENED TAILINGS RHEOLOGICAL AND GEOTECHNICAL

THICKENED TAILINGS RHEOLOGICAL AND GEOTECHNICAL CHARACTERISTICS JAMIE SPIERS Methods for Treatment of Mine Tailings 16 17 November 2010. Water conservation from thickening for reuse in the Yield stress slurry yield stress increases with density. Determines reology of the

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Understanding Rheology of Structured Fluids   TA Instruments
Understanding Rheology of Structured Fluids TA Instruments

Understanding Rheology of Structured Fluids Keywords structured fluids, sol gel transition, solution, yield stress, thixotropy, viscosity, mechanical stability, shelf life, flow curve, inks, cosmetics, dispersions, food 1 AAN016 Figure 1 Viscosity of a structured fluid as a function of shear rate and particle concentration1

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Non Newtonian fluid
Non Newtonian fluid

In a non Newtonian fluid, the relation between the shear stress and the shear rate is different. The fluid can even exhibit time dependent viscosity. Therefore, a

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Paste Thickeners  McLanahan
Paste Thickeners McLanahan

Thus, the higher the design underflow yield stress, the larger and more powerful both the drive and the rake structure needs to be. The floor slope on the tank is often increased to provide some assistance to transport the thickened paste, with 30 and 45 degrees being commonly utilized.

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Yield Stress Calculation Methods   AZoM
Yield Stress Calculation Methods AZoM

The yield stress is taken to be the peak value of the elastic stress, and the corresponding strain value the yield strain. It is important to note that test frequency can influence the measured yield stress based on the relaxation behavior of the material under test.

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Steady state thickener modelling from the compressive
Steady state thickener modelling from the compressive

Many incremental improvements in the performance of industrial thickeners have been based on selecting conditions that produce desired properties in settling test behaviour. Examples include selecting conditions that produce the desired settling rate, final sediment

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Pulp, paste and putty thickeners and flocculants for high
Pulp, paste and putty thickeners and flocculants for high

Recirculation of the slurry through the underflow cone or boot of the thickener by pumping can break the floccules and lower slurry yield stress substantially. Proprietary designs of shearing systems are offered by vendors to provide lower yield stress in delivered slurry. References. Concha, F, and Burger, R, 2003.

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Surface Paste Tailings Disposal   Tailingsfo The
Surface Paste Tailings Disposal Tailingsfo The

However, centrifugal pumps can pump paste depending on the rheological properties of tailings (principally the yield stress). High operating costs associated with the thickening and transportation of paste compared to other methods (even filtration). High risk of not achieving paste from the installed paste thickeners.

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Paste Thickeners   Thickening, Filtering, CCD amp; Water
Paste Thickeners Thickening, Filtering, CCD amp; Water

Paste thickeners can run at 75% + underflows solid depending on mineral) with the underflow not having significant yield stress (Rheology) and can still be pumped using existing disposal systems with centrifugal pumps.

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Paints and Coatings   TA Instruments
Paints and Coatings TA Instruments

stress ramp (Figure 3). Note, that the yield stress is not a fixed value and depends on the test parameter settings. Therefore the test parameters have to be minutiously controlled. The dynamic strain sweep (Figure 4) determines yield stress and yield point from the on set (critical strain) of nonlinear behavior.

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Paste Thickeners   Jacol
Paste Thickeners Jacol

yield stress, which is the force required to initiate flow. The underflow of high rate thickeners is quot;slurry,quot; which has relatively no or only minor yield stress. Conversely, WesTech paste thickeners operate in higher solids concentrations within a yield stress range. This yield stress range produces the benefits of

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Thickeners   Mineral Processing amp; Metallurgy
Thickeners Mineral Processing amp; Metallurgy

High rate thickeners produce the lowest density and yield stress (lt;20 Pa). The highest yield stress underflow is produced by deep cone thickeners and can reach over 150 Pa. Source This article is a reproduction of an excerpt of In the Public Domain documents held in

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Outotec Thickening technologies
Outotec Thickening technologies

Outotec Paste Thickeners are designed to produce a consistent high yield stress underflow, with process control and mechanical reliability second to none. Primarily used for tailings disposal and pre leach applications. Paste thickeners can be used for any application where underflow yield stress in excess of 200Pa is required.

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Thickeners + Rheology Guide
Thickeners + Rheology Guide

Shear Stress the force experienced by the liquid is proportional to the area of the upper plate and is defined as the shear stress, = F/A = Nm 2 = Pascal (Pa). yield the liquid thickener. The diagram (right) shows the essential differences between conventional and inverse emulsions.

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thickener in cip plant   perkinspreschool
thickener in cip plant perkinspreschool

Sep 28, 20170183;32;Oct 20, 2017 Estimate the performance of a full scale CIP and CIL plant. . density on yield stress (thickener rake torque and pumping requirements). Contact Us. 5t/d Mobile Gold CIL Plant for Gold Ore Processing, Xinhai.

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Examples of Rheology Testing Techniques   Viscosity Testing
Examples of Rheology Testing Techniques Viscosity Testing

Yield Stress Testing Yield stress is the stress that must be applied to initiate significant flow in a structured liquid. This flow initiation occurs when a stress is applied that is sufficient to disrupt a materials gel structure.

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efficient deep cone thickener for wolframite in kenya
efficient deep cone thickener for wolframite in kenya

oct 30 to illustrate the differences between these thickener types figure 18 5 depicts underflow produced by the thickener compared with the relative yield stress of the material high rate thickeners produce the lowest density and yield stress lt 20 pa the highest yield stress

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Rheology measurements   Saint Joseph's University
Rheology measurements Saint Joseph's University

Rheology is a study of the change in form and flow of matter, embracing elasticity, viscosity, and plasticity.. Rheology the most sensitive method for material characterization because flow behavior is responsive to properties such as molecular weight and molecular weight distribution.

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Rheological characterization of food thickeners marketed
Rheological characterization of food thickeners marketed

The density, yield stress and viscosity of the thickened fluids were not significantly influenced (p gt; 0.05) by fruit juice, but the type of thickener significantly (p lt; 0.05) affected these properties. The HerschelBulkley model was found to be the most suitable in describing the rheological data of the thickeners in the fruit juices.

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Paste Thickener Design to Achieve Downstream Requirements
Paste Thickener Design to Achieve Downstream Requirements

The thickener options for high tonnage application are either multiple deep cone thickeners or a single high density thickener. This plant target low yield stress underflow would not require the higher yield stress and underflow solids produced by a deep cone type paste thickener.

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Raking in gravity thickeners, International Journal of
Raking in gravity thickeners, International Journal of

Rake torque is a key issue in thickener operation and it was found that the yield stress of the suspension is the major factor in determining rake torque. Over a range of rake speeds, the measured torque was an almost linear function of yield stress.

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Outotec Thickening technologies
Outotec Thickening technologies

high yield stress underflow, with process control and mechanical reliability second to none. Primarily used for tailings disposal and pre leach applications. Paste thickeners can be used for any application where underflow yield stress in excess of 200Pa is required. 74m tailings thickener, Australia 5 x 20 m paste thickeners shipped to New

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