final underflow solids red mud thickener feed solids

(PDF) Steady state thickener modelling from the …

n The technique predicts the steady state solids throughput for φ Py (φ) = k −1 for φ > φg, (2) a given feed solids concentration and thickener Presenting performance prediction outputs in this manner enables improved understanding of how process where Py (φ) = 0 for φ ≤ φg and k, n, w and m are empirical variables influence thickener output.

Feeding a Thickener for Good Settling and Underflow …

 · It is deep enough to extend below the surface of the INTERPACE. The interface is that point where the solids of the thickener and the water that is relatively clean meet. The SOLIDS may also he called the UNDERFLOW. While the water is called either the LIQUEUR or the OVERFLOW.

Tailings filtration: Looking upstream to optimise the filter

greater weight percentage solids underflow. The thickener can also be confidently oper-ated closer to torque alarms, with dewatering at an even greater dry tonnes per hour (tph) throughput as a result of this optimisation. The heart of the thickener is the feed-well3

US6365116B1

The present invention comprises a method for reducing the viscosity of the settled mud or underflow of a raked thickener thereby reducing the torque necessary to move the rake blade through the settled mud. The method includes the step of delivering a viscosity ...

Solid – Liquid Separation – Thickening

 · Clarification takes place in series operation, that is, the thickener underflow from the top compartment serves as feed to the lower compartment. Ultimately, the underflow from say, a six-tray thickener, forms the final thickened underflow. Similarly, all the overflow

Design and development of a novel thickener feedwell using …

Introduction. Thickeners are a key unit in many hydrometal- lurgical processing operations for the separation of solids and liquor. Flocculant is often added to bridge the particles into large, fast-settling aggregates with the aim of producing a clear liquor overflow and a concentrated underflow suspension of solids.

mud thickener

Unit mud volume is defined as the volume of thickener bed (mud) required to achieve a given underflow % solids at a throughput of 1 t/h of dry solids. mud tank hopper - xinhaithickener Drilling mud tanks equipments- Mud hoppers.

(PDF) Understanding the Thickening Process | Shane …

In terms of the solids flux through the thickener, the difference was a factor of 16.5. This has been labelled as a performance enhancement (PE) factor in Figure 3. The model predicts that at the operational flux, the red mud would achieve an underflow solids

Thickeners and clarifiers Complete range of reliable and cost-effective solutions …

improves compaction in the mud bed and increases underflow density. P-DUC pumped feed dilution system In applications where the thickener feed stream is expected to experience wide variations in flow or weight percent solids content, the EIMCO P-DUC feed

Effect of settling test procedure on sizing thickeners

 · For the feedrate of 25 t/h (dry solids) to the thickener and using a safety factor of 1.25, the diameter of the thickener was calculated to be 21.9 m [45]. In this study, the effect of solids concentration at which flocs were first formed on their settling velocities was …

nventional thickener underflow outlet price

 · final underflow solids red mud thickener feed solids Underflow Solids Red Mud Thickener Feed Solidsfinal underflow solids red mud thickener ... Get the price; ... Final products come downwards through outlet. 2.

EFFECTS OF FLOCCULATION CONDITIONS ON THE DEWATERABILITY OF HEMATITE AND RED MUD …

The solids flux and underflow solids concentration for a particular thickener can be evaluated by the use of a one- dimensional thickener model using P y (φ), R(φ) and φ g as

US9199855B2

The invention provides methods and compositions for improving the rheology of red mud removed from Bayer Process liquor. The method includes adding a flocculant and a cross-linked polysaccharide to the liquor. This combination separates the red mud from the ...

IMPROVED THICKENER FOR RED MUD Peloquin, G.* and Simard, …

Peloquin, G. and Simard, G., Proceedings of the 6th International Alumina Quality Workshop 2002 43 torque and underflow solids content are more stable for the off-centered feed well (thick line) compared to the centered one (thin line). Note the large fluctuations in

Understanding the Thickening Process

Underflow Solids Concentration, I(v/v) Solids Flux, (tonnes hour-1 m-2) Process 2 m bed (Flocculated) 5 m bed (Flocculated) Feed Concentration Gel Point (Flocculated) PE factor = 16.3 Figure 3 Red mud thickener performance and model prediction of the solids

Thickener performance variability: underflow solids concentration …

fluctuations of the thickener underflow solids and flowrate are inevitable. The fluctuations of these two important parameters can be attributed to reasons including: The variability in mine orebody during the life of the project not being considered adequately in the

How to Operate a Thickener

 · The solids go from the bottom of one thickener to the top of the next; the solution overflows from one thickener to the next, but in the opposite direction to the way the pulp is travelling. As the solids go up the line, more and more gold-bearing solution is washed out of them by the solution which is headed down the other way.

Flocculants and Rheology Modifiers for Paste Thickening and Tailings Storage Facilities …

mud pumped from A Deep thickener. Thus the application of DRYFLOC D in combination with our trial thickener polymer has enabled the plant: To increase the underflow solids concentration pumped to the stacking area and recirculate more wash water back

IMPROVED THICKENER FOR RED MUD

The kernel tends to cause an increase in rake torque, erratic underflow solids and also underflow blockages. This eventually leads to premature stoppage of the tank operation. We tested several rake configurations, varied operating parameters and feed well configuration in …

Red mud pressure filtration for the alumina refinery s bauxite …

design FL AFP IV filter presses can dewater red mud thickener underflows from initial concentrations of between 30–44 wt% to produce final cakes containing up to 80 wt% solids. We outline the various factors affecting the filtration rate and final

Dynamic simulation of pilot thickener operation using phenomenological model with results validation …

solids content to recover water but not too high so as to damage the thickener or underflow pump. During thickener operation, it is often desired to control the underflow solids concentration to be within a certain range. Researchers have presented many models

Difference Between Clarifier and Thickener

 · The dense Thickener solids are raked to the thickener''s underflow cone and are removed via a slurry pump through the underflow pipe. Underflow slurry densities can vary based on the type of material being processed, size distribution of solids being settled, or other process factors but as a general rule, range from 35-50% solids by weight.

Application of rheology to solving tailings disposal …

 · From the last mud thickener, the underflow at 25–40 wt% solids is reslurried with water to 20–30 wt% solids with coarse sand added before being pumped to disposal in artificial tailings ponds or lakes where the solids settle out and the supernatant liquid is

Numerical simulation of flow regions in red mud separation thickener…

Trans. Nonferrous Met. Soc. China 24(2014) 1117−1124 Numerical simulation of flow regions in red mud separation thickener''s feedwell by analysis of residence-time distribution Tian ZHOU 1,2, Mao LI 1,2, Qiu-long LI, Bo LEI, Qian-zhou CHENN1,2,3, Jie-min ZHOU1,2 ...

SUSPENSION DEWATERING: CHARACTERISATION AND OPTIMISATION

At the actual underflow solids concentration, comparison of the predicted solids flux with the actual value has suggested that there is something in the thickener operation that effectively improves permeability by a factor ranging from 2 to 50 for various thickeners.

Thickener

As the underflow solids concentration increases from high rate to paste thickener, the yield stress increases. In rheology, the yield stress is the minimum amount of shear stress required to initiate and sustain flow ( O''Brien, 2015 ).

US Patent for Chemical treatment to improve red mud …

The invention provides methods and compositions for improving the rheology of red mud removed from Bayer Process liquor. The method includes adding a flocculant and a cross-linked polysaccharide to the liquor. This combination separates the red mud from the ...

Alumina Miniplant Operations­ Liquor From Leach Residue Solids by

Effect of thickener underflow solids and number of stages on estimated pregnant liquor alumina recovery and content in a thickener-only circuit 22 ALUMINA MINIPLANT OPERATIONS-SEPARATION OF ALUMINUM CHLORIDE LIQUOR FROM LEACH ...

Method of stabilizing red mud waste slurries

 · The red mud may be the solids from the final thickener stage by the addition of flocculant alone or the filter cake from the pressure filtration of the slurry produced in the final wash stage. The slurrys of mineral solids are contacted with a water-soluble polymer in the form of an emulsion--macroemulsion or microemulsion.

Effect of Initial Pulp Concentration on Particles Settling Velocity in various regions of Thickener…

been designed based on the 5 percent solids in the feed. Due to changes in the properties of entering feed to the thickener, such as percent solids, thickening operation has been unsuccessful. In other words, entered pulp to the thickener has filled all of

IMPROVING RED MUD FLOCCULATION AT AUGHINISH ALUMINA …

thickener to an additional wash stage. Moving more mud through the circuit translates to higher feed solids concen-tration and higher throughput in thickeners. This can only be done if settling rates and underflow solids are improved. Thus, the flocculation of the

Conventional Thickener Baffled Feed Launder Price

conventional thickener feed inlet price - yoga-kurse-reisen Unlike conventional thickeners, in the feed pipe before the solids are fed into the inlet. from the slurry prior to entering the Thickener feed pipe. Get Price 3-stage 20x … Contact Supplier

US4226714A

The thickener controller adjusts the mass flow rate of the underflow in response to the influent mass flow signal. However, fluctuation of an interface level between clear and unclear areas of the thickener can effect flow rate adjustment.

US4830507A

A method of and apparatus for the thickening of mud-like slurries produced during the course of industrial processes, e.g. the thickening of red muds produced during operation of the Bayer process for the production of alumina. The invention involves the step of ...

High Density red mud residue thickeners

 · It was assumed that the thickener solids Disposal of the red mud residue produce a high underflow density was would require raking to move produced in the Bayer process is an the preferable approach. Some general them to the underflow withdrawal operational requirement faced by all residue slurry properties are listed in point.

ADVANCED TECHNIQUES FOR REMOVING ULTRAFINE SOLIDS …

ADVANCED TECHNIQUES FOR REMOVING ULTRAFINE SOLIDS FROM ALUMINATE PROCESS LIQUOR M. G. Rogers1*, T.Jauhiainen2 1 Australian Process Technology Pty Ltd, WA, Australia. 2 Outotec Oy. Lappeenranta. Finland, Corresponding author: Max Rogers. [email protected]

the polymer in thickener overflow floatation

red mud thickener Grecian red mud thickening and filtration parameters and About 256000 tons/year of red mud cake would be scraped off the filter drum with 40 % w/w moisture on a wet basis In Fig 11 one can see the entire process Fig 12 is a pie chart which shows the quantities of water that are removed from the red mud during the thickening and filtration get price

A Mathematical Model of a Final Clarifier

An underflow rate must be selected which will insure that a sufficient mass of solids is removed in the underflow to prevent the buildup of solids in the final settler. It thus becomes apparent that the return sludge concentration is a function of the mixed liquor input as well as the operation of the final clarifier.

Autoprecipitation Modelling in a Thickener

process variables such as feed volumetric flow, underflow solids concentration, and feed A/C ratio on the ratio drop of both underflow and overflow of the thickener. Keywords: Gibbsite reversion, autoprecipitation, mud thickener, modelling. 1. Introduction

the polymer in thickener over flow floatation

the polymer in thickener overflow floatation red mud thickener Grecian red mud thickening and filtration parameters and About tons/year of red mud would be scraped off the filter drum with 40 % w/w moisture on a wet basis In Fig 11 one can see the entire process ...