Factors determining efficiency of Thickener. Several types of thickeners have been developed and classified according to the arrangement of feed and discharge in the various compartments. For effective thickener control, key considerations are bed mass inventory, underflow density and flow, bed level, overflow clarity and flocculent dosing.
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Both the filtrate and the thickener overflow are usually recycled into the plant feed as shown. 5.1.1 Design and scale-up of conventional one-pass clarifiers The design overflow rate (flow rate per unit area of liquid surface) in conventional one-pass clarifiers is usually from 1 to 3 m/hour, depending on the degree of flocculation.
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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 …
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A number of control approaches for conventional thickeners have been reported in the literature, mainly based on PI and logic (constraint) control. ... A higher value of k implies a harder to compress coal type. Eq. (1) ... The model is …
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High rate thickeners are designed specifically to maximise the flocculation efficiency of flocculants. They differ from conventional thickeners in feed well design, size and control. Unlike …
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High Rate Thickeners include a number of innovative features in design. Our Directional Autodil™ and Turbodil™ systems auto-dilute feed while optimizing performance and flocculant …
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The only papers published to date that have sought to study the transport of bed material to the underflow during raking in thickeners have been the works of Frost et al. (1993), Szalai et al. (1994) and Šutalo et al. (2003). Frost et al. (1993) used a three-dimensional Computational Fluid Dynamics (CFD) model to predict the flow through a circular flat-bottomed …
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pumped suspensions for disposal in conventional 'wet' tailings dams to more concentrated slurries for delivery to 'dry disposal' and backfill applications. The thickening process, although operated successfully ... solids concentration regime typical of thickener operation (very dilute feed to thickened underflow), Paste 2006 – R.J ...
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The thickener area is also required for this calculation. Guess the thickener area for the first iteration. Several iterations of area may be required to achieve a practical thickener size and pumping rate. For a circular thickener with a 15.24 m (50 f t) dia.: A= Pi r 2 = 182.4 m 2 (7)
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Conventional thickener design uses center underflow outlets with the floor sloped at 1:12–2:12 toward the center. ... to 0.01% concentration. For a thickener application, the flocculant is added in the thickener feed launder and distributed across the full launder to achieve optimum mixing. If an ... A higher gas price would be required to ...
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Thickener is key unit in the operational processes of hydrometallurgy and is used to separate solid from liquid. In this study, population balance models were combined with computational fluid dynamics (CFD) for modeling the tailing thickener. Parameters such as feed flow rate, flocculant dosage, inlet solid percent and feedwell were investigated.
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They differ from conventional thickeners in feed well design, size and control. Unlike conventional thickeners, high rate thickeners must use flocculants. The basic design ... the bridge, at a velocity that prevents sanding at the inlet. The standard feed well for conventional thickeners is designed for a maximum nominal flow velocity of 1.5 m ...
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Comparing the two categories the periphery depth of conventional clarifiers have a long sedimentation path of about 2-3 meters whereas the clearance between lamella plates, in analogy to depth, have a short path of 5-10 cm. ... The slurry enters through the feed inlet and directed down and sideways towards the two plate stack compartments ...
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The characteristic features of a High Rate Thickener, which distinguishes it from a Conventional Thickener, are: Deeper feedwell; De-aeration of the feed (either internally in the thickener or external to it) A means of deflecting the feed from the vertical & distributing it within the body of the thickener; Controlled bed level
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The feed for the IPS enters through vertical chambers on either side of the plate packs and passes into each plate gap through slotted feed ports. ... Model LTC The LTC model consists of a number of inclined plate packs installed in a conventional cylindrical thickener tank with a standard centre-drive rake mechanism to remove the thickened ...
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[Show full abstract] desliming the thickener feed using a 102-mm diameter Krebs cyclone to produce a nominal − 1.2 + 0.025 mm product.The effects of slurry flow rate and solids concentration on ...
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Unlike conventional thickener area calculations, the test procedure demonstrates the dependence of the flux curve on the system feed flux. At a given feed flux, there was good agreement between the solids flux curve determined by the method and continuous sedimentation results. ... Normal price $22.00. Member price from $0.00. Add to cart. Fees ...
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The characteristic features of a High Rate Thickener, which distinguishes it from a Conventional Thickener, are: Deeper feedwell; De-aeration of the feed (either internally in the thickener or external to it) A means of deflecting the feed from the vertical & distributing it within the body of the thickener; Controlled bed level
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006 Outotec Outotec® High Rate Thickeners and Clarifiers n Outotec Vane Feedwell™ n Controlled solids inventory n High throughput per unit area Free standing or on-ground tanks n Short retention time n Optional underflow recycle n Clear overflow Outotec® High Rate Thickeners and Clarifiers suit all applications where flocculants can be used in
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Feed Solid Concentration. Conventional thickener design uses center underflow outlets with the floor sloped at 1:12–2:12 toward the center. Lighter duty applications such as clarifiers usually use a 1:12 slope. ... The center outlet is typically a 45-degree cone on bridge-type thickeners and a trench on center column thickeners.
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The standard feed well for conventional thickeners is designed for a maximum nominal flow velocity of 1.5 m/min. High turbidity caused by the depth of the feed well. When overflow clarity is important or the solids gravity is close to the liquid specific gravity, deep feed wells of large diameter are used. ... To achieve optimum operation in a ...
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As shown in Fig. 1, the thickener is a 22 m diameter deep cone shaped tank and its height is 16 m. In the center upper side of the tank, there is a 3 m diameter, 4 m high feed well. The feed well is attached to the 0.9 m diameter concrete support column in the center of tank. The feed inlet pipe is integrated with the feed well and
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In Lamellas and other types of thickeners, the feed wells can be an adjacent tank, a rectangular channel adjacent to the operating elements, a launder, a feed box, or an adjustable jet. In the conventional thickener, particularly in the smaller units, the feed well is primarily a baffle to absorb energy.
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Unlike conventional thickener area calculations, the test procedure demonstrates the dependence of the flux curve on the system feed flux. ... The effective feed fluxes Eq.(13), for the four batch tests were relatively high and ranged from 0.14kg/(mzs) for an initial concentration of 20 kg/m3 to 0.30 kg/(m2s) for an initial concentration of 50 ...
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The products grain size distribution was defined - thickener feed, thickener overflow with and without lamella. The thickener overflow with lamella modules has 2.2 g/l less solid content. The decrease was 75.77 % see figures 1 and 2. According to the tests results the whole conventional thickener was reconstructed with lamella modules.
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We custom design each conventional gravity thickener using customer specifications, standard methods, and computer software for proper sizing and drafting.
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7 Product portfolio HRT HRT-S Design factors Diameter (m) 1 - 125 3 - 10 · Feed rate t/hr or m3/hr Sidewall (m) 1.8 - 3.6 1.8 - 2 · Solids residence time / compaction depth · Clarification zone depth · Geometry Floor slope 1:6 40˚ · Floor slope driven by yield stress and slurry transport
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Conventional Circular Thickener is simple but can be very large. The conventional thickener has a central feed well for introducing the feed slurry. The top of the thickener acts as a clarifier and …
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Over the years tailings thickeners have experienced a reduction in size and sedimentation area required for the same feed rate of solids. These thickeners do not reach the category of "paste" in the underflow, as it happens in the deep cone thickener, but large concentrations of discharged solids and high yield stress, results in a non-Newtonian fluid (Klein et al., 2009 andMcCrabb et …
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Thickeners have been widely applied in the solid-liquid separation process, such as wastewater treatment and tailings slurry thickening process [1], [2], [3]. The principle of a thickener is simple: a feedwell generally receives the tangential feed stream and then transform it to a slow vertical downward flow to the body of the thickener.
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Optimizing your thickener's feedwell with EvenFlo produces consistent cost savings in two ways: Mixing and polymer dosage are interdependent, so providing the optimum condition for …
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