High Rate Thickener; Outotec® High Rate Thickener. Take advantage of our pioneering thickening and clarifying methods with the Outotec High Rate Thickener, including advances such as low-profile triangular rake arms to reduce rake torque. Outotec Directional Autodil™ and Outotec Turbodil™ are the first thickening systems to auto-dilute
How High-Rate Thickeners Work. High-Rate Thickeners separate liquids from solids using hindered settling. Rotating rake arms collect settled sludge and move it toward the center discharge cone. They use minimal amounts of polymers/chemicals to drop the solids, making High-Rate Thickeners environmentally friendly.
AltaFlo™ High-rate Thickener Overview: The AltaFlo™ ultra high-rate thickener is a rake-less thickener that provides mixing, flocculation and internal dilution followed by clarification and positive sludge collection and removal in a single tank. The principles of flocculation have been further adapted to a new design that will thicken
RAKE THICKENER TWS also offers a range of rake style, high rate thickeners which allow for minimal feed height, facilitating gravity feed from upstream cyclone based washing systems. Rake thickeners are designed specifically to deal with high volumes of slurry.
High-Rate Thickeners separate liquids from solids using hindered settling. Rotating rake arms collect settled sludge and move it toward the center discharge cone. They use minimal amounts of polymers/chemicals to drop the solids, making High-Rate Thickeners environmentally friendly.
Lower-yield stress muds, as produced in a high-rate thickener, require less torque to move rakes through the mud. 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
Description. The High-Rate thickeners became popular in the mid 1980's and are relatively newcomers to the sedimentation line of equipment. As already discussed previously Thickeners are a major component in a plant layout and occupy large spaces which may be saved by introducing high-rate machines. Furthermore, they are normally positioned far away from the center of the plant so to allow
The measurable parameters that can be used for thickener control include thickener feed flow rate, feed density, underflow density, overflow clarity, bed level, bed mass, rake torque, rake height, solids settling rate and underflow rehology. RAKE TORQUE. Rake torque is the most fundamental instrument and an accurate indicator of when things
global leader in high-rate thickeners. 100+ times smaller footprint with comparable flocculant consumption to conventional rake thickeners and no moving parts. Feed densities up to 55 % discharging underflow at 70 % (solution could be halved) no other thickener can compare.
The rake’s slurry delivery rate is cal culated by the thickener vend or, usually with an allowance for maldistribution of solids sett ling across the thickener, and as sisted by the floor slope
High-rate thickener ANDRITZ process engineering will determine the optimum percentage of feed solids for the specific application during laboratory or pilot plant test work. The optimum percentage of feed solids will ensure proper flocculation and achievement of maximum fluxes (t/m 2 /d).
High-Density Thickeners can be considered an intermediate case between High-Rate Thickeners and Paste Thickeners. They are commonly characterized by: Having a higher sidewall tank (to provide enhanced compression effects) A steeper floor slope to assist in moving solids to the discharge area A low profile rake structure combined with pickets to enhance the bed dewatering A rake drive suitable
Rake Thickener Tanks. TWS also offers a range of rake style, high rate thickeners which allow for minimal feed height, facilitating gravity feed from upstream cyclone based washing systems. Rake thickeners are designed specifically Learn More about Rake Thickener Tanks
• The thicker underflowfrom a HRT implies that the rake mechanism operates at higher torque levels. This necessitates a robust drive arrangement and a failsafe torque sensing arrangement to protect the drive. The Drive arrangement in the MBE High Rate thickener comprises of a Hydraulic drive comprising of a hydraulic motor coupled to a
The PHOENIX AltaFlo™ Thickener is a rake-less thickener that provides ultra high-rate mixing, flocculation, and internal dilution followed by clarification and positive sludge collection and removal in a single tank. The Thickener's unique internal geometry, a deep sidewall and steep conical bottom provides underflow concentration comparable
The control parameters used to maintain stable operation in high rate thickeners are underflow solids density, underflow withdrawal rate, flocculant dosage, solids inventory in the tank, solids feed rate, and mechanical torque limit restriction of rotating rake arm
The thickener mechanism generally will have more robust rake design with increased torque capacity compared to a high rate thickener with the same diameter (Bojcic, 2000). The rake torque factor can be three to four times higher and will vary with underflow density according to an empirical relationship that depends on rake shape and drive
A little earlier I talked about the rakes of the thickener, these are long arms that extend off of the bottom of the DRIVE SHAFT. As the shaft turns the rakes will sweep the entire bed of the thickener thereby applied Torque. Each rake arm is higher at its far end than it is where it joins the drive shaft. This is designed this way to give the bed a slope towards the centre of the thickener
To produce high concentration underflow, the yield stress of underflow in DCT is much higher than conventional high-rate thickeners, resulting in a much higher rake torque demanding for DCT .
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Automatic rake lift & lower; Control systems with bed level, bed pressure, torque and rake elevation; Bolted Tank designs for modular plants & reduced site erection time. Our Thickeners are designed using SOLIDWORKS parametric modelling, ensuring consistency and rapid delivery of certified & manufacturing drawings.
High Rate Thickeners Perhaps the most significant design optimisation effort in thickening in the last twenty years has been in developing ways to more effectively use the horizontal cross sectional area of the thickener. The introduction of polymeric flocculants gave an impetus to development of High Rate Thickeners.
The feed well of the Cogede High rate Thickener can be also customised in order to guarantee an optimum flocculation by an auto dilution system or by force dilution system according the specific characteristic of the slurries.. Moreover our High rate thickener have a system that allow us to measure continuously the effort on the rake and by a system of hydraulic jacks to move up and down the
The AltaFlo™ ultra high-rate thickener is a rake-less thickener that provides mixing, flocculation and internal dilution followed by clarification and positive sludge collection and removal in a single tank. The principles of flocculation have been further adapted to a new design that will thicken slurries at an even higher rate than a
Thickeners. Westpro’s thickeners are equipped with new generation hydraulic drives, high capacity feedwells, and low drag-high capacity rakes to deliver superior solids settling performance. Along with their robust construction, Westpro’s thickeners ensure superior performance in high-torque applications.
High-rate thickeners are designed to provide roughly 12 times the throughput of conventional machines of similar size. The key cage and rake mechanisms, while the truss bridge, extending from the centre pier to the tank periphery, supports the walkway and feed system.
Jan 26, 2015· Thickeners are designed to operate continuously with slurry/water consistently flowing into the centerwell with thickener underflow pumping balanced to maintain a mud bed in the thickener. Key to thickener operational efficiency is the solids must be able to settle 2-4 times faster than the nominal water up flow rate.
GNZ-type thickener is a kind of new type central drive high-rate thickener which has automatic rake lifting technology. The thickener adopts central drive, and has efficient silos, automatic rake lifting technology and other national patents; The design of heavy cores can ensure the continuous operation of the thickener in extreme conditions
HiFlo™ High-rate Thickeners Overview: WesTech HiFlo™ high-rate thickeners are used in many types of process circuits to separate liquids and solids at very high rates. They are highly effective in coal refuse thickening, gold recovery, CCD circuits, copper leaching, molybdenum processing and other mining and chemical flowsheets.
To produce high concentration underflow, the yield stress of underflow in DCT is much higher than conventional high-rate thickeners, resulting in a much higher rake torque demanding for DCT . The yield stress of the suspension, rotation speed, and rake structure have great influence on rake torque [
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