clarity of overflow thickener

Feeding a Thickener for Good Settling and Underflow Density ...

Oct 30, 2017 ... How much you feed a thickener and how/where you feed it will determine how well slurry or concentrate settles it it as well as the level of ease or difficulty you will have at obtaining a good underflow density and overflow clarity. By using the head assay of the concentrator, and the metallurgical test results...

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Beginners Guide to Thickeners - Outotec

INSTRUMENTATION. The measurable parameters that can be used for thickener control include thickener feed flow rate, feed density, underflow density, overflow clarity, bed level, bed mass, rake torque, rake height, solids settling rate and underflow rehology.

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Intelligent Control of an Industrial Thickener - Semantic Scholar

A. Thickeners. Thickeners are used for increasing the solids content of a slurry. The general objectives are clean overflow and maximum solids concentration in the underflow. Flocculants are typically used to agglomerate the solids to increase the settling rate and improve the overflow clarity. Thickeners generally operate...

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Thickening Resource Book - Maintained by Rudi Steyn

concentration, solids-liquids interface heights, and overflow clarity. Underflow pumping control is sometimes used to control two of these: bed pressure and underflow solids concentration. An approximately steady state material balance must be maintained around the thickener. Although the volume of pulp in the thickener...

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Optimising thickener efficiency - Sustainability Matters

Dec 3, 2009 ... Incorrect measurements can lead to water being drawn out through the underflow, sludge spilling over in the overflow or incorrect flocculation. There is unnecessary ... Accurate volumetric measurement of the thickener's inflow is vital to ensure the clarity of the recovered process water. Essentially, the...

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Strategies for Instrumentation and Control of Thickeners and Other ...

Flocculants are typically used to agglomerate the solids to increase the settling rate and improve the overflow clarity. Thickeners generally operate continuously with very high on-line availability. They are used in a wide variety of industries, and in numerous applications. Thickener control has a number of complexities such...

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overview thickener control - Mintek

The LeachStar Thickener Controller is aimed at providing the following benefits: •. Reduction in flocculent consumption. •. Improving the clarity of the thickener overflow water. •. Ensuring stable thickener operation by minimising bed slides or high rake torque scenarios. •. Stabilising the flow rate and density of the underflow,...

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Thickener optimization to reduce production costs | Endress+Hauser

In the thickener process there are many critical key performance indicators that show how the process is running – all of which need to be measured accurately and reliably. Hydraulic pressure, bed height and bed mass are some of the critical measuring points, as well as underflow density, underflow rate, overflow clarity...

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Techniques and methodologies for improving thickener performance ...

Jul 31, 2015 ... behaviour in the bulk of the thickener and therefore on through-put, underflow density and overflow clarity. Another flow related phenomenon of importance is natural dilution, the extent of which also influences the. resultant aggregate properties and hence settling behaviour. CFD modelling has been used...

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Thickeners: How they Operate - Mainland Machinery

Jan 12, 2017 ... High feed solids recoveries reporting to the bottom of the thickener ensures high solids recovery and high overflow clarity levels. Modern thickeners are designed based on use of highly effective synthetic (polyacrylamide) flocculants, ensuring high solids capture and adequate settling rates. Coagulants are...

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ThICKENERS - Tenova

Mar 30, 2017 ... Conventional Thickeners. ▫. Pinned Bed Clarifiers. ▫. Conventional Clarifiers. PINNED BED CLARIFIERS. The DELKOR Pinned Bed Clarifier is a unique process for hydrometallurgical plants where solution clarity is important. Offering very low suspended solids count in the overflows, the clarifier regularly...

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P266 Website - Improving Thickener Technology

Poor performance is often blamed on the flocculant, but in reality, most problems relate to how the flocculant is dosed and sub-optimal hydrodynamics during the flocculation process. The challenges are to understand how to increase throughput, enhance performance (overflow clarity, underflow density, flocculant usage,...

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THICKENERS: A Sedimentation Option | romeo allan v. FORTUNA ...

Sep 19, 2014 ... Such a condition is called hindered settling and affects both clarity of liquid overflow at the top and high slurry density at the bottom of the separation vessel. The most economical method of achieving separation is by the use of Thickeners. Consistent recovery values, high holding capacities, low operating...

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Biosolids Technology Fact Sheet Gravity Thickening - epa nepis

Allows for longer detention times before anaerobic conditions create gas bubbles and floating solids. Helps thicken waste-activated solids and clarify the supernatant. Improves overflow clarity but may have little impact on underflow concentration. Source: Parsons, 2003. • Visually examine the skimmer to ensure that it is in...

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AltaFlo - HubSpot

Why Choose an AltaFlo™? The 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...

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Design and development of a novel thickener feedwell using ...

The overflow is usually collected from the outer edge of the upper surface of the thickener, and the thickened underflow is typically removed (by pumping) through a .... implications in terms of short-circuiting and bed scouring, which can significantly impact on throughput, underflow density, rake torque, and overflow clarity.

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SMARTDIVER - ProProcess

This instrument is a ruggedised mud diver that provides measurement of mud levels, settling zones and overflow clarity in thickeners, clarifiers, washers and decanters. Tank profiling (suspended solids vs depth) is also provided, as it is specific gravity profiling and bed level measurement. Process engineers, armed with the...

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Cyanide Management by SART

Acidification, Recycle and Thickening (SART) process was selected. A detailed testwork program for SART was undertaken with the .... The thickener overflow containing the cyanide discharges to the neutralization tank where .... period, the clarity of the overflow would have been eventually deteriorated. Therefore they...

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sonarflex sludge blanket detection - HyControl

Sludge Thickeners - Settling blanket level / Clarity suspended solids ... level / FLOC / Clarity. Mining and Process settling ponds, lagoons, tailings dams, carbon columns. PRINCIPLE OF OPERATION. The Sonarflex transducer initiates a high powered acoustic pulse ... be monitored to prevent overflow into the launders).

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Inclined plate settler - Xinhai

The size and cost of the gravity settler can be reduced by matching the thickening and clarifying requirements more closely. Two basic criteria for gravity settling equipment are good clarity of the overflow liquid and maximum density of the underflow solids discharge. The area needed to clarify a suspension is often greater...

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Vietti Slurrytec - Solutions

Ore, Water and Slurry Characterisation; Design Data Generation – flocculation, thickening, filtration tests; Equipment Sizing; Dewatering Circuit Design for ... Conditioning of the process water circuit with the in-house developed ClariVie44® reagent to improve flocculation efficiency and overflow clarity, particularly in...

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thickener at construction site

thickening - cec mining systems. maximum underflow density and overflow clarity with bolted construction options to for many projects to expedite fabrication shipping and installation on site. Consult. Hot...

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deep cone thickeners - Alumina Quality Workshop

Abstract. Synthetic flocculants have come to play a prominent role in improving the operation of various systems in Alumina. Refinery. They are used for improving settling and filtration characteristics of mud in settlers, washers and thickeners prior to disposal, and also to improve overflow liquor clarity and mud compaction.

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Integrating Control of Flocculant Delivery in a Phosphatic Clay ...

the flotation water source. Enviro-Clear Circuit: Reduction in Operating Costs - Field devices for measuring feed surface area, overflow clarity and depth of clear water above the flocculated clay interface were used in the control of flocculant. Previously the flocculant addition was adjusted to control the thickener mud depth.

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Controlling thickener underflow rheology using a temperature ...

Apr 19, 2014 ... Paste-like behavior results when underflow is discharged at 50°C, whereas low viscosity, near Newtonian behavior results when the underflow is discharged at 20°C. Compared to conventional polyacrylamide-based flocculants, PNIPAM produces higher concentration underflow but lower clarity overflow...

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Coal Preparation Plants - Process Control Services

Process Control Services Pty Ltd, ABN 22 054 111 018. Ph: Sydney (02) 9319 1808, Brisbane (07) 3299 7881, Melbourne (03) 9859 0157, Auckland (09) 525 3425. eMail sales@pcspl.com.au, Web www.pcspl.com.au. Clarity. Thickener: Overflow Clarity. • Installation: T30 Sensor, immersion from bridge on thickener with.

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Continuous Thickening of Non-Ideal Suspensions - IDEALS @ Illinois

flow velocity increased, and the clarity of overflow generally deteriorated. Dick, Richard, I. and Javaheri, Ali, R. CONTINUOUS THICKENING OF NON-IDEAL SUSPENSIONS. University of I1 linois Water Resources Center Report No. 45. KEYWORDS--thi ckening/sedimentation/acti v a t sludge/ water softening sl udgelwaste...

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Current Trends in Countercurrent Decantation and Thickener Circuit ...

The Manta CCD/Thickener Cube is made of two parts: 1. the Manta Underflow Cube, and. 2. the Manta Flocculant Cube. Both the Underflow and Flocculant Cube have been further developed to utilise the measurements of heavy mud level, interface settling band and the overflow clarity that are obtained from an online...

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Gravity thickener - SlideShare

Mar 2, 2014 ... 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.

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SmarDiver is a ruggedized mud diver - AlCircle

SmarDiver is a ruggedized mud diver that provides measurement of mud levels, settling zones and overflow clarity in thickeners, clarifiers, washers and decanters. Tank profiling (suspended solids vs depth) is also provided, as it is specific gravity profiling and bed level measurement. Process engineers, armed with the kind...

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AquaCycle thickener for recycling wash plant water CDE - CDE Global

Confidence. Clarity. Comfort. The AquaCycle thickener is designed for seamless integration with our M-Series modular washing plants and EvoWash sand washing plant. Wet Classification Equipment.

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Thickeners - Solid-Liquid Separation

Thickening in the downward direction to increase underflow density generally to reduce the size of downstream filters or centrifuges. Clarification in the upward direction to reduce the amount of fines that report to the overflow to meet: statutory requirements for effluent quality. recycled overflow clarity for internal process...

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FLSmidth - EIMCO E-Xinhai Clarifier Thickener

No moving parts - Lower capital cost - Lower energy consumption - Less maintenance; Smaller surface area than conventional thickeners - Lower capital cost - Smaller footprint; Self-diluting feed - Optimal flocculant utilization - No external dilution pumps required; Good overflow clarity - Effluent re-use; Dense underflow...

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monitoring suspended solids in biosolids processing stages ... - Hach

thicken the sludge. Four of the most common methods are centrifugal thickening, gravity thickening, dissolved air flotation, and gravity belt thickening. Each method concentrates the ... of solids in the centrate. Increasing the incoming sludge volume decreases the clarity of ... tank collect water overflow. If a gravity thickener is...

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TSRU Tailings Pilot-Scale Thickening and ... - Barr Engineering

released at the thickener surface. The following recommendations were offered by Outotec: •. Feed solids loading - 0.6-0.7 t/m2h. •. Flocculant dosage - 70-100 g/t solids. •. Achievable underflow solids - 43-48%. •. Achievable overflow clarity - <0.3%. Bench settling tests in 2-L graduated cylinders were also conducted during...

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Validation of Turbodil Flow Predictions - CFD

Dec 12, 2012 ... Feed dilution is frequently applied to thickener feedwells to improve the flocculation process. Various methods are ... settling rate and overflow clarity. The flocculation process is complex, but in broad ... thickener feedwell design (Triglavcanin 2008, Heath &. Triglavcanin 2010, Nguyen et al. 2006, Nguyen et...

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Brett Salisbury, Science Developments, Australia, introduces a step ...

The thickener underflow is either further dewatered or disposed of, while the clarified water is returned to the plant for re-use. In many CHPPs, there are times when tailings thickeners ... Sometimes referred to as blackwater, the clarity of the water from the ... water overflowing from the thickener. It is generally observed that...

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Gravity thickener / for sludge treatment - LT series - Xinhai ...

This ensures that the cost and size of gravity settler is reduced by matching the clarifying and thickening details more effectively. There are 2 standard parameters necessary for gravity settling systems including clarity of the overflow liquid and the optimum density of the underflow solids. Additionally, the area ideal for...

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Products & Services - MIP Process Technologies South Africa ...

Sedimentation technology was originally developed in the mining industry. Prior to the development of the continuous thickener, batch gravitational settling was employed. In such batch operations, dilute feed was pumped into a tank continuously until a clear overflow was no longer obtained. The feed was discontinued and...

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Separating Liquids from Solids With Thickeners – Articles for Small ...

Jan 3, 2018 ... To separate solids from liquids. thickeners are widely used in various industries including mining, coal, chemical, industrial, environmental (wastewater .... 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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