factors in coal high rate thickener

High Rate Thickeners - Solid Liquid Separation

Description. The High-Rate thickeners became popular in the mid 1980's and are relatively newcomers to the sedimentation line of equipment. As already discussed previously Thickeners are a major component in a plant layout and occupy large spaces which may be saved by introducing high-rate machines. Furthermore, they are normally positioned far away from the center of the plant so to allow ...

(PDF) Understanding the Thickening Process

100 have been observed for selected materials in high rate thickeners ... a coal deposit or ... does not coincide with the yield stress this indicates that one or more of the above factors may be ...

4 x Flowrate 4 x 200 π Riserate - MIP Process

Say, we have a coal tailings application and testwork shows a rise rate of 2 m/h with a pulp feed flow rate of 200 m. 3 /h. ... A factor (Z‐Factor) is used based ... Therefore for a 12m diameter high rate thickener with the coal tailings duty, we can use medium duty (K‐Factor of 15) ...

High-Rate Thickeners | McLanahan

High-Rate Thickeners, or Clarifiers, recover immediately reusable process water for mineral and aggregate producers, as well as environmental contractors. Thickeners are beneficial in a variety of applications, including areas where water is in short supply or very expensive, re-circulated water is not suitable for reuse in a plant, ponds are located on minable reserves, or ponds must be ...

thickeners & clarifiers - MIP Process Corp

• High Rate thickener (special feed well design) • High Density thickeners (deeper sidewall and more robust drive) • Paste thickeners • Ultra high rate thickeners Our units are available in a variety of sizes starting from 3ft diameter pilot scale to 300ft diameter. We have standard “off the shelf” designs available.

(PDF) Understanding the Thickening Process

100 have been observed for selected materials in high rate thickeners ... a coal deposit or ... does not coincide with the yield stress this indicates that one or more of the above factors may be ...

HiFlo High Rate Paste Thickeners - westech-inc

HiFlo™ High-rate Thickeners Overview: WesTech HiFlo™ high-rate thickeners are used in many types of process circuits to separate liquids and solids at very high rates. They are highly effective in coal refuse thickening, gold recovery, CCD circuits, copper leaching, molybdenum processing and other mining and chemical flowsheets.

Beginners guide to thickeners - Outotec

Jun 16, 2017 · In high rate thickener (HRT) designs the rise rate or solids loading will dictate the required tank diameter for any given throughput. In high compression (HCT) and paste (PT) applications the bed depth or the mass of solids in the thickener must also be selected to ensure the desired underflow density from the thickener is achieved.

Treatment of coal tailings - ScienceDirect

Jan 01, 2013 · Most thickeners operate with all three regimes present – certainly in any high rate thickener where feed dilution is used. One of the regimes will be the ‘rate determining step’ and this, together with the requirements of the process performance, will be the factor that determines the size and design of the equipment. 16.2.2.

Dewatering to higher densities - an industry review

than high rate machines on similar materials in order to be able to handle performance excursions where very high viscosity material is produced. In the 1960s and 1970s the British National Coal Board (NCB) developed and installed a number of Deep Cone Thickeners (DCTs) to process coal flotation refuse. They were designed to take advantage of ...

Design Considerations for a Tailings Disposal System | E & MJ

A high density thickener produces thickened tailings. The difference between a high rate and a high density thickener is the underflow will not segregate—that water remains bound into the mixture. A deep cone, or deep bed, thickener produces paste. Both high density and deep cone thickeners depend on retention time rather than area.

High-rate Thickener | FLSmidth

High-rate Thickeners are designed to provide roughly 12 times the throughput of conventional machines of similar size. The key features for high-capacity thickeners are the feedwell design and the feed slurry dilution method. Our patented E-Volute™ feedwell offers Computational Fluid Dynamics (CFD)- optimised energy dissipation and solids ...

How to Size a Thickener - Mineral Processing & Metallurgy

Mar 08, 2016 · Factor of Safety: Normally a 25 per cent factor of safety is allowed in determining the thickener area size. Thus, in the above case, 8.87 (largest of three figures) plus 25 per cent factor of safety, equals 11.09 square feet area required per ton of dry solids fed to the thickener per 24 hours.

Thickeners | McLanahan

McLanahan offers a range of thickener types, including High-Rate , Ultra Rakeless, High-Density and Paste, that are tailored to an individual application. They can be used as stand-alone solutions or in conjunction with other equipment. High-Rate Thickeners are used by the aggregate and mining industries, as well as environmental contractors ...

(PDF) Thickener Waste Management in Mineral Processing To ...

For example, for solids with a density of 2.7, the maximum Figure 1: A designed thickener for the recovery of coal tailing in a size of the thickener feed has about 60mesh (to protect coal processing plant (Banisi and Yahyaei, 2007) thickener).

Thickeners | Nesans Mining and Automation Private Limited

The underflow flow rate is also monitored to keep the mass-balance of the thickener. Rake torque Sensor : The Rake arm of the thickener is suspended from above the feedwell of the thickener. Temporary plant shut-downs or power failure will allow free solids to settle and undergo compaction when the thickener is started again.

Uses and Benefits of Flow Measurement in the Operation of ...

The high solids percentage can prevent other non-intrusive meters from getting a measurement (ex: ultrasonic meters), because the high fluid density blocks the signal [5]. Use and relevance of thickener underflow flow measurement The underflow flow rate measurement is useful for the operator when it is combined with a density

Thickener Torque -Rakes & Drive

Aug 13, 2015 · 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 of torque that indicates to the operator the load that is in the thickener and when the rake arms have to be lifted.

PHOENIX Process Equipment - Mining Technology | Mining ...

Coal Tailings Dewatering, Classifiers, Separators, Thickeners and Belt Presses for Sand Processing and Fines Recovery ... The resultant underflow volume reduction factor is as much as eight to ten for the slurry reporting to either the final dewatering stage or to the slurry pond. ... an ultra high rate thickener for sand wash plant slurries ...

Thickening expertise applied in coal maximises water ...

Nov 11, 2009 · Paste and high rate thickening are emerging as a significant way to maximise water efficiency in Australia’s coal industry. Outotec has designed and installed the first-ever paste thickener in Australia’s coal industry and has won five further orders recently for paste and high rate thickeners.

Biosolids Technology Fact Sheet Gravity Thickening

----- Factor TABLE 2 FACTORS AFFECTING GRAVITY THICKENING PERFORMANCE Effect Nature of the solids feed Freshness of feed solids High volatile solids concentrations High hydraulic loading rates Solids loading rate Temperature and variation in temperature of thickener contents High solids blanket depth Solids residence time Mechanism and rate of solids withdrawal Chemical treatment Presence of ...

Considerations and Parameters in Thickener Selection

High flow, fluid bed thickeners These units must be adapted to varied applications. They must provide operating flexibility to meet process needs. Such factors multiply the decisions which must be made prior to the selection of a thickener.

Thickeners - Solid Liquid Separation

The high time for thickeners was in the 60's when the metallurgical industries were booming and sizes of up to 150 m diameter were constructed. Such jumbo thickeners, when centrally driven, require for most demanding applications extra heavy duty drive heads some of which reach a continuous operating torque of 3.300.000 Nm.

Introduction of Equivalent shape factors for investigating ...

Coal refuse (average density: 1.6 g/cm3) related to thickener inter of Interkarbon coal preparation plant with 80% of particles smaller than 35 µm. Copper ore (average density: 2.7 g/cm 3 ) with 80% of particles smaller than 80 µm.

The Development of Paste Thickening and Its Application to ...

Jun 12, 2015 · The development of paste thickening and high density technologies have changed the economics used in evaluating the benefits of increased thickener underflow density. This comes at a time of increasing competition for scarce water resources and a tightening regulatory framework in both water use and impoundment. These and other factors have led to a growing number of plants using high

Characterization and flocculation studies of fine coal ...

The coal sample was subjected to flocculation tests using a 1000 ml graduated cylinder. For this purpose the desired amount of coal was mixed in water to the desired pulp density and the pH of the slurry was adjusted by using dilute HC1 and NaOH. The water used for the slurry preparation was collected from the tailing thickener overflow in order

Conventional Thickeners - Solid Liquid Separation

The torque capability of a thickener drive is specified as Duty Rating being the maximum mechanism design strength or the 100% setting on the Torque Control Box. The torque, in turn, depends on a K factor and the thickener diameter based on the following formula: Torque

A Theoretical Model for the Rake Blockage Mitigation in ...

Jan 22, 2019 · Deep cone thickener (DCT) is key equipment in cemented paste backfill (CPB) technology. However, rake blockage occurs frequently in DCT during the dewatering process of the unclassified tailings being thickened from dilute slurry to thickened tailings or paste. Rake blockage has disastrous effects on the CPB operation. In order to investigate the influencing factors of rake

Thickener Torque -Rakes & Drive

Aug 13, 2015 · 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 of torque that indicates to the operator the load that is in the thickener and when the rake arms have to be lifted.

Improve Clarifier and Thickener Design and Operation

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)

Tailings Dewatering Technologies for Australian Coal ...

Findings: Current practise at Australian coal preparation plants is to thicken fine coal tailings with high-rate thickeners utilising high molecular weight polymeric flocculants. The thickener underflow is either dewatered further or disposed of. Disposal is either in fine tailings ponds or

(PDF) Numerical study of flocculation settling and ...

Since total tailings are too fine to be dewatered and thickened [11], the conventional gravity high-rate thickener and filter, in addition to being costly, will result in a low solid mass fraction ...

Dewatering of Mine Drainage Sludge - EPA

----- Dewatering of Mine Drainage Sludge by Coal Research Bureau West Virginia University Morgantown, West Virginia 26506 for the ENVIRONMENTAL PROTECTION AGENCY Project 14010 FJX December, 1971 For sale by the Superintendent of Documents, U.S. Government Printing Office, Washington, D.C. 20402 - Price $1.00

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