Clarity Of The Thickener Overflow
Thickener Optimization in your mining process - …
Thickening is the separation of suspended particles from a liquid by gravity settling. For effective thickener control, six measurements are critical: bed mass inventory, bed level, underflow density and flow, flocculent dosing and overflow clarity.
Improving thickener performance — FLSmidth Discover …
Operation of slurry thickeners is generally a compromise between clean overflow water and underflow density. Either the 22 m tailings thickener will achieve a high underflow density, which enables maximum water and cyanide recovery, or it operates to improve overflow water clarity and enables a positive impact on gravity gold recovery.
Gravity clarification and thickening - ScienceDirect
Gravity clarification and thickening 175 treatment. It allows higher overflow rates (typically from 3 to 7 m/hour) because it has an integral deep bed filter to treat the overflow which, due to the higher flow rate, might be cloudy.
SMARTDIVER - ProProcess
The PLA SmartDiver is one example. 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.
TSRU TAILINGS PILOT SCALE THICKENING AND …
Samples of thickener feed, underflow, and overflow were taken throughout the program for various analyses to characterize these streams. Solvent evaporation from the thickener surface was anticipated and so a Lower Explosive Limit (LEL) detector was installed close to the thickener surface. The alarm was never triggered.
Thickeners: How they Operate - Mainland Machinery
Thickeners: How they Operate. The most common solids-liquid (S/L) unit operation is thickening. A wide variety of thickeners are used including conventional, deep well, paste, high rate and clarifiers which is a thickener subclass used for removing solids from turbid or very low % solids waters.
Feedwell is the heart of a thickener - Conference Papers
Clarity of the process water is often regulated if discharged and poor clarity recirculates solids that cause a burden on the system. The patented EvenfloTM feedwell has been installed in all types of thickener in China and around the world with significant improvements to overflow clarity and overall thickener operation.
v118n2a3 Optimization of the Rössing …
overflow clarity. These modifications are currently being phased in at Rössing, with the process control upgrades and the feedwell on the terminal thickener being prioritized. ><%,7:03 countercurrent decantation, optimization, process control thickener, feedwell design. * Hatch Africa, Johannesburg, South Africa.
AMIT 145: Lesson 6 Dewatering & Clarification
There are three modes of sedimentation in a thickener: Clarification in which solids settle either individually or are collected into separate floccules, each of which then settles at its own characteristic settling rate, closely related to Stoke’s law;
Feeding a Thickener for Good Settling and Underflow ...
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.
clarity of overflow thickener - newstonight.co.za
Beginners Guide to Thickeners Many thickener installations operate with water recovery below design limits largely through conservative control and feed density, underflow density, overflow clarity Feedwell is the heart of a thickener Authors: Johnson, J; feedwell has been installed in all types of ...
Beginners Guide to Thickeners - Outotec
Beginners Guide to Thickeners; Beginners Guide to Thickeners. Thickening is a process where a slurry or solid-liquid mixture is separated to a dense slurry containing most of the solids and an overflow of essentially clear water (or liquor in leaching processes).
Instrumentation and Control of Sedimentation …
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 continuously with very high on-line availability. They are used in a wide variety of industries, and in numerous applications.
Thickener Operation - Zeroday Enterprises
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.
Thickening - Resource Book
Overflow from the unit may be called 'overflow’, ‘effluent’, or ‘supernatant’. Underflow may be called ‘pulp’, ‘sludge’, ‘slurry’, ‘mud’, etc. The terminology will depend upon the industry application. How a Continuous Thickener Works As a feed stream enters the thickener, the solids settle to the bottom.
Laboratory Continuous Dynamic Thickening Tests
Samples of the underflow and overflow were taken every 15 minutes after the system reached a steady state. Overflow quality was determined by a Clarity Wedge and calibrated to TSS. Feed solid concentrations used were 14.6 and 28.2 percent at pH 8.8 using a dual polymer system.