The polyester filter media with a defined pore size deliver a quality effluent and high filtration efficiencies. They are highly effective in coal refuse thickening, gold recovery, ccd circuits, copper leaching, molybdenum processing and other mining and. Fully automatic high rate thickener mild steel tank, supporting structure and conditioning rakes. It is imported as it is not readily available locally, hence accounts for its high cost value. The thickening process is the primary method of producing high solids. Types of thickeners aquathick it is our cold water range of textile thickener. Hi rate thickeners type typical thickener dimensions they produce a wide variety of thickeners, size up to dia. Aculyn 33 rheology modifierstabilizer a costeffective. Deeper feedwell submerged feedwell discharge feed pipe submerged radial distribution of feed faster separation achieves superior effluent clarity and high solids underflow in one operation. The technology is a significant advance because, other than some minor design changes, feed wells in highrate thickeners have changed little in the past 15 years.
Deflector plate feedwell radflow feedwell perturbed area feedwell type comparison in scale model thickeners both running at 3mhr rise rate. High rate thickener hrt is a relatively old concept in the world market by now. Westech hiflo highrate thickeners are used in many types of process circuits to separate liquids and solids at very high rates. Fundamentals of concentrated suspensions settlingthickening. Paste, paste thickening, deep cone thickener, high density thickener, high rate thickener, tailings dis posal. Unlike conventional thickeners, high rate thickeners must use flocculants. Many of these are easily measured, while some can be difficult. I want to know the design considerations for a high rate thickener that will be. The basic design of a high rate thickener is below. Highcapacity mode, in which the characteristic settling. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. They differ from conventional thickeners in feed well design, size and control. Mip thickener design the following is a short cut to designing your.
Files are available under licenses specified on their description page. Testwork and sizing for paste thickeners international. Take advantage of our pioneering thickening and clarifying methods with the outotec high rate thickener, including advances such as lowprofile triangular rake. Overdosing floc chemical also can reduce the compacted bed density so a feed back control loop is required for automatic dosing control. As one can see in figure 3, the continuous simulation achieved an underflow suspended solids concentration of 59 wt% when the mud residence time is between 4 and 6 hours. This research seeks local alternatives to natrosol as a thickener in paint production. The grabcad library offers millions of free cad designs, cad files, and 3d models. Sizing a high rate thickener thickening, filtering, ccd.
In high rate thickener hrt designs the rise rate or solids loading will dictate the required tank diameter for any given throughput. These rigs simulate the bed filtration behavior of a high rate thickener and generate settling flux rate data that can be used for accurate sizing. This residence time is normally associated with high density thickeners high rate thickeners have residence times less than this. Debottlenecking of thickeners in a changing environment 2 in assessing the decision to modernize, we consider the elements of an upgrade and the advances in thickening technology that allow operators to meet new challenges. The high rate thickener is designed to accept the maximum whole tailings slurry flow rate and separate it into two flow streams. There are two basic types of high rate thickener units. With every change in shear rate, paint undergoes a change in viscosity whereby a higher shear rate leads to a lower viscosity. 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. The high rate thickener design is based on bench scale testing of the whole tailings slurry. Take advantage of our pioneering thickening and clarifying methods with the outotec high rate thickener, including advances such as lowprofile triangular rake arms to reduce rake torque. The highrate thickeners became popular in the mid 1980s and are relatively newcomers to the sedimentation line of equipment. Optimal control of clarifierthickeners diva portal.
Altaflo high rate thickener overview the altaflo ultra high rate thickener is a rake less thickener that provides mixing, flocculation and internal dilution followed by clarification and positive sludge collection and removal in a single tank. Altaflo high rate thickener westech engineering, inc. Like the high rate thickener, the paste thickener uses high floccu lant dosage and optimised feed. All structured data from the file and property namespaces is available under the creative commons cc0 license. To illustrate, if waste activated sludge, which is typically pumped from secondary tanks with a content of 0. Products and equipment from westech engineering, inc. Densadeg high rate clarifierthickener by degremont technologies a subsidiary of suez environnement. Chapter 3 sludge thickening thickening is a procedure used to increase the solids content of sludge by removing a portion of the liquid fraction. To better understand how a paint behaves at different shear rates, we typically look at three different types of viscosity measurements reflecting the low, mid and high shear rate regions. Thickener tanks, rakes and feedwells are custom designed.
The phenomenological theory of continuous thickening of flocculated suspensions in an ideal cylindrical thickener is provides a method for thickener design. Where and to the extent that removals are governed by settling rates, such. One example is the high rate thickener, which must have some degree of automation for efficient normal operation. The cfb 450 sludge thickener as per request loading. To facilitate us in giving you a proposal we would like the. Solids settle out onto the baffles and are removed from suspension after settling only a short distance.
Pdf understanding the thickening process researchgate. Printplus it is our hot water range of textile thickener. The system is fully automated and continues to filter even during a backwash. The etaq draws supernatant from the thickener surface and pumps into the radflow feed stream to achieve the perfect level of feed dilution for optimal focculation. The delkor ultrasep concept permits a very high allowable rise rate in the thickener and thus reduces the required thickening.
Highshear viscosity is also referred to as ici viscosity. Do you want the latest high capacity thickening technology. To illustrate, if waste activated sludge, which is typically pumped from secondary tanks with a. By closing this banner, scrolling this page, clicking a link or continuing to browse otherwise, you agree to the use of cookies. Improve clarifier and thickener design and operation. Instrumentation and control of sedimentation equipment abstract some of the process variables that are commonly monitored on a thickener are torque, rake height, bed level, bed pressure, feed rate and density, underflow rate and density, settling rate, and overflow turbidity. Thickening is a process where a slurry or solidliquid mixture is separated to a dense slurry containing most of the solids and an overflow of essentially clear water or liquor in leaching processes. Lamina or tube settlers and solids recirculation units lamina thickeners they contain spacecutting baffles that intercept settling paths at many levels. Clarifierthickener is a highrate solids contact clarifier which combines optimized flocculation, internal and external sludge. The following is a short cut to designing your own thickener. Yyy was preselected by xxx to provide the thickener. The altaflo ultra highrate thickener is a rakeless thickener that provides mixing, flocculation and internal dilution followed by clarification and positive sludge collection and removal in a single tank.
Westpro th8hc 8ft diameter elevated high capacity thickener in. Using add reply allows you to attach images or pdf files and. Rake lifting devices can be manual for small diameter thickeners or motorised for larger. Altaflo highrate thickener westech engineering, inc. Highshear viscosity influences brush and roller drag, as well as film build and thus contributes to hiding. Hydraulic loading rate and solids load are the main design parameters.
This is not difficult to provide, for high rate thickener is characterised by a relatively short time lag between a process change and the effect of the change. Furthermore, they are normally positioned far away from. As the compression zone gets deeper, the underflow density for a given flux rate increases, as a. Thickening is a procedure used to increase the solids content of sludge by removing a portion of. Rise rate parametrizes the area required to recover the design flow or solids loading, the design dry tonnage. Find high rate thickener related suppliers, manufacturers, products and specifications on globalspec a trusted source of high rate thickener information. Pump sludge at faster rate in summer versus winter. The thickening process is the primary method of producing high solids slurries to bring the two together to make rational improvements to thickener design and. Azfab high rate thickeners are designed to recycle 90 percent of your wash plant water. Likewise, thickeners are often used for storage to facilitate the continuous. A costeffective thickener for formulations containing polar solvents this bulletin focuses on our aculyn 33 rheology modifier stabilizer, a costeffective thickener and particulate suspending agent, particularly suited for formulations containing polar solvents and to stabilize suspensions. High rate thickeners high rate thickeners are designed specifically to maximise the flocculation efficiency of flocculants. Thickeners and clarifiers complete range of reliable and cost.
In developing our highrate thickeners, we draw upon decades of experience in. A wide variety of high rate thickener options are available to you, there are 181 suppliers who sells high rate thickener on, mainly located in asia. Highshear highshear processes include brushing, certain aspects of rolling, and spraying. The reliability and performance of delkor thickeners means that they are well represented throughout the world. Westech thickeners each westech thickener type can include any combination of the top ten thickener features. Finally, we will discuss the process of modernizing a thickener so as to achieve the clients stated outcomes. In table i of the july article, improve clarifier and thickener design and operation, by joel christian pp. Instrumentation and control of sedimentation equipment. The system can reduce and in conjunction with other equipment completely eliminate the.
Join the grabcad community today to gain access and download. The superdisc disc filter is a highrate filtration process that fits into a compact footprint and requires less backwash than other filtration systems. Natrosol is used as a thickener in paint production. Conventional thickeners are generally incorporated in heavy duty applications when the underflow density is high and substantial torques are required to convey the settled solids from the periphery to the central outlet for pumping away. Rheology modifiers that are classified as ici builders generally. Reclaiming water quickly and efficiently can improve your operation and your bottom line. Hrts with interestingly different design features, have overcome many of the disadvantages of a conventionally designed thickener. Aquathick is a special printing thickener having high viscosity, more bright color, and low consumption of powder, good penetration, high color yield and easily washable and soft handle. As already discussed previously thickeners are a major component in a plant layout and occupy large spaces which may be saved by introducing highrate machines. Modern highrate thickeners generally incorporate some form of internal dilution into the feed well to dilute the feed and improve flocculation. The principle of paste thickeners is that the compression zone is much deeper than on either high rate hrt or high compression hct units. This page was last edited on 15 august 2014, at 03.
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