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High-rate thickener for coal, 20 m in diameter. 4 1 3 Deaeration tank: Specially designed to reduce air entrainment in order to minimize turbulence and flocculant shearing in the feed pipe. Evenflow 2.0 feedwell: The newly improved feedwell …
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The introduction of synthetic, high molecular weight, water-soluble polymer flocculants was a turning point in tailings dewatering within the minerals industry. Gravity thickening had previously relied on coagulants and natural products (e.g. starch) to aggregate particles and accelerate settling. Synthetic flocculants enable much larger ...
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After being treated to solid–liquid separation in thickeners (settling with flocculant/polymer), the wastewater is recycled and utilized in plants. For effective dewatering in the thickening, a high settling rate, a low turbidity overflow, and a high concentration downstream are necessary.
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High flocculant dosages (>60 g/t flocculant with the dosing pumps running at ) had no effect under these conditions: recovery often required a reduction in the feed rate. Laboratory testwork quickly identified the sensitivity of the settling rate to changes in feedwell solids levels (Figure 3).
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The key advantages of a High Rate Thickener over a conventional thickener are as follows: Some of key features of the MBE High Rate Thickener are • The HRT is designed specificallyto operate with flocculantsand hence optimises flocculant consumption. • The HRT has a special " McTurbo" feed well design combined with automatic feed
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Thickener area. The thickener area depends on the mineral sedimentation rate (m2/t/d) or the specific feed rate (t/h/m2) which are determined by laboratory or pilot testing. These tests are carried out with representative samples of mineral and different granulometry. The tests also evaluate different dosages of flocculant.
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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 …
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The feed system comprises a critical set of components that have a significant impact on the overall thickener performance by ensuring the feed material is properly conditioned before being introduced to the …
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Purchase this Article for $25.00. Feed slurries are typically flocculated in a thickenerÆs feedwell to increase the settling rate, underflow density and overflow clarity. High molecular weight polymeric flocculants are normally used, but present a number of challenges in terms of make up, dilution, delivery and mixing with the feed slurry ...
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High-rate thickeners are used in the mining industry to improve water recovery from slurries and increase their solids ratio. High-rate thickeners operate under strict constraints and several disturbances. ... the feed slurry and the flocculant flow rates as the manipulated inputs, the feed slurry density, the circulation and the outlet flow ...
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discharge rate. Higher feed rates to a given thick discharge is typically relatively small compared to particles up to the overflow. Only those particles ha velocity will possibly settle out. Hence, thickener overflow water clarity can be achieved. In general, thickener handling rate is expres area (GPMFt2) or cubic meters per hour per
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The pH scale is used to determine how acidic or basic the water is. Most flocculants work best at neutral conditions (pH 7) while some work independently of the pH. Flocculants are categorized as anionic, nonionic or cationic and therefore affected by pulp pH. Basic thickener operation will have you understand the simple electrics of water.
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Flocculant Dilution System in Thickener Feed well. In order to maximise the benefits obtained from flocculating agents when used as settling aids in high rate and conventional thickeners, it is often necessary to dilute the thickener feed prior to flocculant addition. In some cases, no flocculation at all is possible unless dilution water …
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During thickener operation, feed enters the feedwell, via a feed pipe or open launder. In order to promote settling, it is increasing to dissipate this energy. In some cases, flocculants or coagulants are added to the feed to agglomerate particles and improve settling. Feed dilution may also take place.
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These five tests include particle size analysis, cylinder test and chemical screening, static settling, dynamic settling and yield stress. Since the settling rate is heavily influenced by the particle size, the first …
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The thickener is 150 m diameter and was designed to process 13000 m3/h of pulp, containing 27% of solids, with a specific gravity of 1.2, to deliver an underflow with a 54% of solids. The flocculants is added at a rate of 15g/ton of pulp or about 270 m3/h of a solution with a low flocculants concentration (0.02%).
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symmetry as well as excellent feed preparation. Reactorwell™ enables maximum thickener usage due to a higher exit symmetry, resulting in better thickener operability and improved response to process changes. It also enables improved overflow clarity with higher underflow density. Flocculant usage is one of the highest running costs for a ...
DetailsThe AltaFloTM ultra high-rate thickener provides the highest throughput per square meter of any thickener on the market. With excellent overflow clarity and underflow density similar to or better than conventional high-rate thickeners, the AltaFloTM has a unique place in the market. The small footprint makes it an excellent choice when space is ...
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This is the reason that the feedwell in this work is configured with an annular shelf at the tangential feed pipe. A high turbulent shear rate generally increases the aggregation rate first by increasing the mixing and particle collision rates. ... Modelling the impact of two different flocculants on the performance of a thickener feedwell ...
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The settling rate provides some insight into the size of Thickener needed, and the compaction indicates what the underflow density might look like. Dynamic settling. The dynamic settling test is used to simulate how a Thickener will perform based on real-time feed and flocculant dosing. Yield stress
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Comprising of High-Rate Thickeners, High Compression Thickeners, Paste Thickeners, Clarifiers, Polymer Dosing Units, they ... Feed, underflow & overflow • POLY units • 2, 5, 10, 15, 20, 25, 34, 50, 75, 100 ... Outotec Thickener • HRT, HCT, PT, HRT-S Pipe bridges and maintenance walkways Underflow Outotec pumps Sump system
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Increasing the concentration of solids in the feed (up to 25 wt %) reduces the size and cost of the equipments required for separating. If a high concentration of solids in the feed is used with flocculant, thickener overflow can dilute feed and can increase sedimentation rate and clarity.
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The flocculant addition point (or points) can be used as a tuning method to alter the effective flocculation time in a feedwell, with addition further up the feed pipe increasing the residence ...
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Thickeners are utilized in various solid/liquid separation processes in order to increase the density of a process stream. Feed solids concentration is the single most important variable affecting the sedimentation properties of given slurry. High-rate thickener. ANDRITZ process engineering will determine the optimum percentage of feed solids ...
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HIGH RATE TECHNOLOGY. Our specialised feedwell design allows for improved sediment discharge directed at the thickener apex, thus decreasing short circuiting and competing of solids particles with each other, leading to a faster settling rate of the material. Clarified Overflow. Electric & Hydraulic Drive Options. Bed Level & Density Control.
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An 18 m-diameter Deep Bed™ paste thickener at paste disposal facility (feed volume/rate is 288 t/h) • A 90 m-diameter primary Titan™ traction thickener is situated at the main plant (feed volume/rate is 18000 m 3 /h) [30], [31] Western Australia Iron Mine (Anonymous) Australia • Decrease flocculant usage > 16 wt% •
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Various batch simulations were done at the optimal feed solids percent and optimal flocculant dosage conditions. The average underflow density achieved in the batch tests was 55% solids (w/w). ... (High Rate thickeners have residence times less than this). Ruashi Post Leach Sample Deep Tube Test Retention Time vs Solids Concentration 0.0 …
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The cause of unusually high thickener overflow solids can be easily resolved using a video/magnification system to measure the ... flocculant is introduced into a pipe through which the feed suspension flows at a set rate, and aggregate 'size' measurements are made downstream using the FBRM probe in order to determine the rate at which the ...
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independent variables such as flocculant rate, underflow flow-rate, and feed rate. Figure 3 Common thickener configuration with independent and dependent variables Thickener feed Thickeners are commonly fed from a distribution tank. The line that feeds the thickener often has a slight incline and the flow is driven by gravity.
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