The pilot-scale thickener facility used in this study is a closed loop system and is shown schematically in Fig. 1.A sample of slurry is mixed continuously in a 4.5 m 3 mixing tank, and pumped out of the mixing tank underflow into the pilot thickener. The thickener tank is a 2 m diameter by 2 m high side wall tank with a 14° floor and a small …
Thickener Rakes and Supports Metallurgically, and mechanically, Rakes are correctly designed. From a metallurgical point, the exclusive design of the Spiral Rake imparts a continuous turning motion …
the entire system is located inside a thickener tank and makes use of internal overflow liquor for dilution purposes. ... torque alarm, automatic rake mechanism lifting up to 600 mm, electrical tripping, and mechanical safety stop …
A common variant on the gravity thickener design is the picket fence thickener. This technology is fitted with a stirrer comprising a series of relatively closely-spaced vertical arms, and is therefore similar in appearance to a picket fence. For both designs, the sludge enters the centre of a cylindrical tank and flows out to the periphery.
Typically installed in concrete tanks, traction thickeners have a stationary centre pier which supports the rake mechanism central bearing about which the rake arms rotate.
10′ Eimco thickener with tank and 2 HP rake drive, leg risers, and electrical switchgear & controls. Equip yourself with the gold standard.
Rota-Rake® Thickener The Graver Rota-Rake® Thickener is a horizontal flow sedimentation and thickening unit for the efficient separation of suspended solids from liquids by gravity. Designed for maximum separation, positive sludge removal and complete overload protection, the Rota-Rake consists of: 1. Round or square tank with conical …
The Horizontal Decanters (Rake Thickener) are ideal for the largest water flows. They have a limited height and are provided with an upper sludge thickening system. Horizontal decanters are made of stainless steel in their middle and large versions, while the largest ones are made of concrete.
A thickener has several basic components: a tank to contain the slurry, feed piping and a feed well to allow the feed stream to enter the tank, a rotating rake mechanism to assist in moving the concentrated solids to the withdrawal points, an underflow solids withdrawal system, and an overflow launder.
a conventional thickener tank with standard center drive rake mechanism •mechanism and rake lift Substantial reduction in TIC due to large settling area to floor area ratio LTC 440 - 5400m2 Key features • Cylindrical or Conical tank with inclined plate packs, for high thickening performance & extended sludge buffering
Rake torque & lift: For hydraulic rake drives, the hydraulic pressure needs to be measured to monitor process problems like insufficient underflow pump rate or blocked discharge outlets. This generates either a …
One or more rotating radial arms are there within the tank, from each of which are suspended a series of blades, shaped so as to rake the settled solids towards the central outlet. With modern thickeners, there is a functionality of these arms rising automatically if the torque exceeds a certain value, thus preventing any damage which …
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 …
The WesTech AltaFlo High-Rate Thickener is a rake less thickener that provides the highest throughput per square meter of any thickener on the market. ... 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 ...
We custom design each conventional gravity thickener using customer specifications, standard methods, and computer software for proper sizing and drafting. ... A heavy duty drive unit with precision bearing and gear transmits torque through a steel center shaft to the rake arms. Equipped with Torkmatic drive control, the WesTech drive unit ...
Depending on the type of thickener, the underflow will range in density from a free-flowing mud to a paste. Thickeners are characterized by having higher side walls, steeper floor slopes and a more robust mechanism. How to size a Thickener. To get the highest underflow densities, features such a tank geometry and rake design will be …
As the load in the thickener settles to the bed, the Torque on the rake arms will be climbing. Torque is nothing more than a rotary force being applied from the rake arms to the drive shaft. It is the degree …
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. ... Lifting devices allow rake mechanisms to rotate while the assemblies are raised or lowered. Hydraulic lifting devices have replaced ...
The picture on the right shows a 6 meter diameter wooden tank "Dorr" thickener installed back in 1908 in the Kennicott Copper Mill in McCarthy, Alaska and in 2011 I had the thrilling opportunity to fly from Chitina to McCarthy in a six seater plane to visit the abandoned mill. ... Arms that rake the entire tank floor twice per revolution;
A schematic of the thickening experiment and detailed parameters for this thickener are shown in Fig. 1. The thickener consists of a conical body tank, a central feedwell with an annular shelf inside, a conical deflector, and four rakes driven by a central shaft. A rectangular feed pipe is tangentially configured with the feedwell.
The rake arm is then free to follow the arc that maintains constant cable length and tensions, while still preventing rotation of the arm and tilting of the rakes. …
These particles settle to the bottom of the Thickener tank. The solids-free liquid then overflows the s at the top of the Thickener tank, while the concentrated solids are pumped out to waste or to the next part of the process. ... This test helps to confirm the required rake torque. ...
HiFlo™ Thickeners are available in several standard sizes & custom configurations including bolt-together tank, flat bottom, elevated tank, rake lift, and embeeded stave. For complete elimination of the slurry pond, a PHOENIX Belt Filter Press or Filter Press may be added downstream of the HiFlo™ Thickener to dewater the thickened slurry.
Static rods, while not technicall y part of the thickener rake, are som etimes fitted inside the tank to assist the raking mechanism b y retarding the tendency of the slurr y bed to rotate with ...
Rake thickener is mainly composed of thickening tank, rake frame, transmission mechanism, feeding device and unloading device, mainly relies on gravity sedimentation to separate suspended solid ...
Separation of particulates from liquids in large circular settling tanks is used widely in the minerals and waste water industries. Depending on their primary function, these vessels are variously termed settlers, washers, clarifiers or thickeners but for simplicity, the generic term "thickener" will be used in this paper to describe all of these …
Paste Thickeners feature tanks with high side walls and steep floor slopes to aid with the compression effects of the mud. A rake and picket system powered by a rugged drive …
3. Positive slude collection and discharge system including motor-driven scraper and conical central discharge sump in the bottom of the tank. The Rota-Rake is available in a wide range of sizes and designs to fit the …
