LABORATORY TESTING FOR DESIGN OF THICKENER CIRCUITS Joseph M. Keane K D Engineering Co., Inc. 1844 W. Grant Road, Suite 106 Tucson, Arizona 85745 ... and Naidel (1979) utilizes data from the graduated cylinder batch sedimenta- tion tests with the addition of rakes rotating at a very slow speed to attempt to achieve the maximum …
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This chapter covers the design and operation of gravity thickeners, dissolved air flotation thickeners, centrifuges, and gravity belt thickeners for wastewater treatment. It includes …
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Steady-state analyses and methods of thickener design that are essentially based on Kynch's theory include the papers by Talmage and Fitch (1955), Hassett (1958, 1968), Moncrieff (1963/64), Wilhelm and Naide (1981), Lev et al. (1986), Waters and Galvin (1991), Yong et al. (1996) and Chancelier et al. (1997), see also the reviews by Concha …
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The AMIRA P266 'Improving Thickener Technology' series of projects has sought to provide a firm scientific basis for feedwell and thickener design, a requirement as pressures on water usage in the ...
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The data in the table below have been collected for the settling of flocculated suspensions using dilutions of 2:1, 3:1, and 4:1. a) Plot the data and determine the settling rate of the suspension at each dilution. In each case, the settling rate should be determined graphically from the straight-line portion of the plot before compression begins. b) The final dilution …
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In very simple words, a thickener is a machine that separates liquid from solids. It is defined as a method of continuous dewatering of a dilute pulp, wherein a regular discharge of a thick pulp takes place which is of uniform density, concurrently with an overflow of clarified solution.
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doi: 10.1007/978-81-322-3634-4_20 ++. Chapter 20. Design of Thickeners. Abstract This chapter presents different theories of thickener design. These the-ories have been …
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A thickener is an equipment structure used for the continuous gravity settling (sedimentation) of solids in suspensions. Suspension is fed into one or more basins or chambers and, whilst it is …
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4.11 Design Example 23-58 5.0 GRAVITY BELT THICKENER 23-60 5.1 Evaluation and Scale-Up Procedures 23-61 5.2 Process Design Considerations and Criteria 23-62 5.2.1 Unit Sizing 23-63 5.2.2 Other Design Considerations 23-64 5.2.3 Mixing Design 23-64 5.2.4 Flocculation Design 23-64 5.2.5 Belt Speed Design 23-65 5.2.6 Plow Design 23-65
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The understanding of hydrodynamic characteristics and particle size distribution (PSD) of solid–liquid disengagement is crucial to design a continuous …
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Thickener outputs can accommodate a range of tailings disposal options from low yield stress, easily . pumped ... for informed use of data for design or optimisation.
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The innovative paste-thickener design facilitates highly clarified liquid recovery as well as maximum underflow densities. 3 Cost-effective solid-liquid separation with crystal clear overflow VARIETY AND AVAILABILITY Thanks to the thickener's innovative, modular design, ANDRITZ is able to offer a wide range of thickeners and ...
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Computational fluid dynamics (CFD) is a powerful tool for optimizing the design and performance of unit operations used to achieve particle aggregation and sedimentation. Early CFD feedwell modeling gave predictions on the solids and fluid flows, which were useful for identifying discharge asymmetry and short-circuiting currents, but …
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Where there is little significant effect of compression factors, the bed depth can be selected based upon operating characteristics of the thickener installation. In this case, information must be available (or assumed) concerning the normal fluctuations in feed rate and concentration. Also, sludge storage requirements should be considered. For …
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It is employed mainly in design calculations to determine the required thickener area, the most important design parameter, and ultimately the maximum …
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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 …
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The Dorr torq thickener is a new development in the unit thickener field. The raking mechanism is supported from a stationary central pier on which the driving motor and gear reduction are mounted. The feed may be introduced at the center through a launder suspended above the top of the liquid leavel or by means of a siphon feed through the ...
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Equipment Design. There are three main types of thickeners/clarifiers: bridge support, column support, and traction. In a bridge support thickener, such as the one shown below, the rakes and drive mechanism are …
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The design of a new thickener or the determination of the capacity of an existing thickener requires calculations at steady state. Since 1912, several methods …
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Keywords: elevated tank, thickener, ASCE 7, liquid storage, slurry, sloshing . 1. INTRODUCTION Outotec Pty Ltd designs mining and industrial thickeners for Australia and overseas. A common tank design is a cylindrical steel shell with a truncated conical bottom elevated above ground on steel columns. An example of a typical thickener tank ...
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Consider the design of an industrial thickener for a feed rate of 178 tons per hour, with an underflow concentration of 57.3% of solid by weight of a copper tailing with the following properties: ... This contribution summarizes, and applies to experimental data, a recent approach [Bürger, R., Diehl, S., 2013. Inverse Problems 29, 045008] for ...
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Similar to the digesters, there are two design approaches in thickeners too: 1. Design based on experience. 2. Design based on Iaboratory data. 1. Design based on experience Solids throughput is an important criterion in the design of thickeners. The design is mostly based on the solids flux, i.e. kg solids/h/m2. Typical flux values are given ...
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THICKENER DESIGN, SIMULATION AND CONTROL By F. Concha, J.P.Segovia, D. Sbarbaro and R. Bürger ... In addition, at the beginning of the test, where reliable data are needed, it is difficult to ...
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As always, pilot or large-scale tests, if properly conducted and evaluated, yield the best test data for thickener design. 5.2.2 Applications, construction and types of gravity thickeners Most of the applications of gravity thickeners are in mineral and coal processing, and in waste water treatment.
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On the whole, the numerical simulation prediction presents a good agreement with the experimental data, showing that the proposed model can simulate the liquid-solid flow with a wide particle size distribution in a gravity thickener and gives a reliable prediction of separation performance. 3.2. Feedwell performance3.2.1. Kinetic energy …
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How DAF works. Dissolved air flotation (DAF) provides thickening of sludges (i.e. thickens the sludge) by encouraging the solids to float to the surface, rather than allowing them to sink as in gravity thickening.. DAF is applied to increase the sludge solids concentration when these solids are neutrally buoyant (i.e. neither sink nor float) and so …
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Table 3.2.1 Step-by-step approach for the design of settling-thickening tanks Step 1 Establish design criteria Step 2 Calculate surface area Step 3 Calculate thickened sludge volume Step 4 Determine tank dimensions Step 5 Configure inlet and outlet Step 6 Operation and maintenance Step 1: Establish design criteria
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The process control systems need a very good understanding if the thickener operation as well. My advice is to get a basic understanding of the principles and then discuss your issues with the experts i.e. the thickener suppliers and rake suppliers and get them to look at a design which suits your application.
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