Raking in gravity thickeners

2008-3-28 · The rake arms are made from slotted rectangular section plate and the blades are bolted to the arm at the desired positions and angles. This allows rapid changes to be made to the number of blades, the blade spacing, angle of attack and type/size of blades (see Fig. 2a).For the conventional rake studies here, five blades were used and were mounted at 30° from the …

Theoretical Concept of Gravity Sludge Thickening; …

sludge, and the rotating sludge rake usually is designed so its peripheral velocity is about 5 fps (1.5 m/sec). Presently accepted thickener design procedures, based on laboratory batch settling test and theoretically derived analytical procedures for "ideal" slurries, fail to relate the batch set tling data to the "non-ideal" condi

Thickener Rake Arm Design, Severe Acid Environment

Thickener Rake Arm Design, Severe Acid Environment. A large USA mining firm required a 50 foot diameter replacement thickener rake arm assembly designed specifically for a severe high temperature acid environment. GES Tech Group was retained to conduct material corrosion testing and recommend materials resistant to the slurry. Rake arm section ...

Rake Thickener Tanks | Washing Systems

2022-7-29 · Rake thickeners are designed specifically to deal with high volumes of slurry. The integral scrapers aid transportation of material from the outskirts of the tank to the outlet, thus accelerating the removal of sludge from the …

Cable supported rake arm thickener

The respective rake arms have angled rake blades 77 which push against and move settled material toward the central withdrawal outlet 48. FIG. 9 schematically shows pairs of support posts 71, 72 attached at 81 to the bottom chords of the drive trusses 31, 33, 43, 44 at equidistant points from the overall truss and thickener centerline.

Thickener Feed System Design

2016-6-14 · Thickener Feed System Design. Philip Lake June 14, 2016. Philip Lake reviews WesTech''s EvenFlo® feedwell design for the even distribution of the feed slurry in order to provide the end user with the most economical thickener in terms of flocculant consumption and size. Gravity thickeners concentrate suspended solids in minerals slurries.

Thickener experiences at Langer Heinrich Mine

The rake blades as installed by the vendor can be seen in Figure 1. The measured slurry density pumped out of the thickener is more often than not lower than the calculated density of the slurry in the cone section of the thickener, therefore rake blades were deemed to be inadequate and modifications to the blades were made.

(PDF) THICKENER DESIGN, CONTROL AND DEVELOPMENT …

2019-1-4 · combine in the design, contr ol and operation of a modern thick ener. This paper does not seek to. provide all the answers in thi ckener design …

Conventional Thickeners

2017-10-30 · The Conventional Thickener. Conventional Thickeners are generally incorporated in heavy duty applications when the underflow density is high and substantial torques are required to convey the settled solids from the …

Thickener Torque -Rakes & Drive

2015-8-13 · Torque is nothing more than a rotary force being applied from the rake arms to the drive shaft. It is the degree of torque that indicates to the operator the load that is in the thickener and when the rake arms have to be lifted. Usually there is a point on the thickener torque indicator where the power to the rakes will be shut off if the ...

Improve Clarifier and Thickener Design and …

2021-2-19 · Corrections. In Table I of the July article, "improve Clarifier and Thickener Design and Operation," by Joel Christian (pp. 50-56), the titles Vi and TSS are reversed. The first TSS is 3.1 and the first Vi is 6.045. In the …

thickener rake tip speed

Thickener Rake Manufacturer. 04-01-2016· thickener rake tip speed TRclub Noord Holland . The tip speed of the outer blade at 1 rpm corre- sponds to the same tip speed as that in a 40 m thickener The pilot-scale thickener facility used in this study is a operating at a rake speed of 3 rev h− 1 (20 min rev− 1). closed loop system and is shown schematically in Fig. 1.

Most common problems in thickener operations …

3. Mechanical and maintenance issues. Sometimes problems that originate from failures in thickener components can occur. The most common are described below. Mechanical issues. Due to specific events of high torque as well as …

Thickeners | Westpro Machinery

High capacity feedwell design with optimum retention time performance and even distribution of solids. High torque capacity rakes. Rake blades designed for precise removal of solids without disturbing the settled solids. Low maintenance hydraulic drive base with torque and rake position monitoring capabilities. Drive base lift up to 24″.

Paste thickener

Unique Design Features. Unique design features including smart rake system, low profile rakes with tie-cable load sharing, rake blades supported by thixoposts, steep tank floor slope and high sidewall, high installed drive torque, and feed …

Mathematical model and factors of paste thickener rake …

The paste thickener is a key component that shows high efficiency dewatering, and rake shearing greatly affects tailings dewatering performance; therefore, appropriate rake torque design is crucial for efficient paste thickener operation. Rake torque is a key factor in determining the dewatering extent and the rate of flocculation in the ...

Designing for Paste Thickening Testwork and Sizing for …

form agglomerates, which in thickener tanks leads to a phenomenon known as "rotating beds", "donuts", or "islands". These characteristics present challenges to the designer of the rake mechanism. The subject paper addresses the requirements for designing a paste thickener, covering the following topics: • Testwork for thickener ...

Raking in gravity thickeners | Request PDF

2008-3-1 · Greater confidence in the CFD rake model and its extension to global transport for homogenous beds were obtained from validation in a 2 m diameter pilot-scale thickener, with flocculated, fine ...

Numerical simulation and optimization of red mud …

2014-3-1 · In order to acquire the flow pattern and investigate the settling behavior of the red mud in the separation thickener, computational fluid dynamics (CFD), custom subroutines and agglomerates settling theory were employed to simulate the three-dimensional flow field in an industrial scale thickener with the introduction of a self-dilute feed system. The simulation …

Rota-Rake® Solids Thickener

2022-7-27 · Solids Thickener. The Graver Rota-Rake® Clarifier is a horizontal flow sedimentation and thickening unit for the efficient separation of suspended solids from liquids by gravity. Designed for maximum separation, positive …

Investigation and Design of a Picket Fence …

2022-7-27 · 3.5.3 Picket Fence Thickeners (PFT) Picket fence thickeners enable the thickening and settlement of particles suspended in water into a sludge, which can then be removed for disposal or treatment. Their rotating blade consists of …

SOLUBLE METAL RECOVERY IMPROVEMENT USING …

2009-8-26 · Minerals thickener rake design and drive torque are designed to overcome the most severe condition. The Southern African Institute of Mining and Metallurgy Base Metals Conference 2009 M C Mulligan and L Bradford _____ Page 262 Figure 4 below identifies a general relationship between thickener type and yield stress or underflow ...

Raking in the benefits

2008-2-18 · For example, in conventional rake design every blade is the same size, so rake blades on the outside of the arm move faster than the inner blades and rake more material toward the underflow than ...

2012-4-18 · Me chanical model of scraper rak e torque in deep ­cone thickener WU Ai­xiang, JIAO Hua­zhe,WANG Hong­jiang, YANG Sheng­kai,YAO Gao ­hui, LIU Xiao ­hui (School of Civil and Environment Engineering, University of Science and Technology Beijing, Beijing 100083, China)

A Critical Review of Thickener Design Methods t

The design method consists in measuring, in the labo­ ratory, the initial settling rate of a suspension with the concentration of the feed to the thickener and applying equation (6) to find the area S of the thickener. As we have already discussed, the concentration in the zone II of the thickener is not that of the feed

Thickeners – MIP Process Technologies (Pty) Ltd

MIP''s tank design provides for a scalloped bottom mild steel tank design. Thickener Mechanism. The mechanism consists of the drive with an optional lifting device, torque tube, rake arms, blades and bridge. MIP drive heads consist of a multi-stage planetary gearbox, hydraulic drive unit, and an optional lifting device. Lifting Device

High-Rate Thickeners | McLanahan

Operating logic allows for customization of the unit for plant needs, including the ability for the Thickener to shut down without an operator being present during extended hours of operation. The hydraulic drive gives an accurate sense of torque on the rakes. At high torque conditions, a rake lift will activate to draw the rakes up from the mud.

Beginners guide to thickeners

2017-6-16 · Beginners guide to thickeners. Thickening is a process where a slurry or solid-liquid mixture is separated to a dense slurry containing most of the solids and an overflow of essentially clear water (or liquor in leaching processes). The driving force for the separation is gravitational, where the differences in phase densities drive the ...

Australian Centre for Geomechanics

The behaviour of a flocculated suspension in compression needs to be well understood in order to arrive at a reliable thickener tank configuration (i.e. diam- eter, cone angle and depth) for a required paste result. ... • Testwork for …

Thickeners | McLanahan

A modern feedwell design based on computational fluid dynamics (CFD) modeling ensures minimal flocculant usage. Optional sensors for monitoring bed level, underflow density and overflow turbidity ensure optimal operation. ... A lifting device is a mechanical attachment to the drive head that lifts the Thickener''s entire rake mechanism out of ...

Thickener Torque -Rakes & Drive

2015-8-13 · Torque is nothing more than a rotary force being applied from the rake arms to the drive shaft. It is the degree of torque that indicates to the operator the load that is in the thickener and when the rake arms have to be …

Fluidization Analysis of Thickening in the Deep Cone for

2020-8-5 · By fluidization theory, fluidization design was conducted for the deep cone system in Huize mine. Field operation shows that fluidization design decreased the failure time of the thickener from 14 hours to 1 hour, improved the stability of the deep cone thickener, and provided reference values for similar mines.

Thickener mechanism

We claim 1. A thickener mechanism of the central column type having a plurality of rake arms with scraper blades attached thereto for raking the contents in a settling tank on rotation of said rake arms around said central column, said mechanism comprising a first cage supporting a first set of rake arms and being rotatable on said central column, driving means for said first cage, a …

High-rate Thickener | FL

EIMCO and Dorr-Oliver thickeners are available in both bridge-supported and column-supported designs. We offer beam- or truss-type bridges, depending on thickener diameter. In the bridge-supported design, suitable for thickeners up …