The settler section utilizes the same countercurrent flow principle and the inclined plate design used in packaged lamella gravity settlers. They are highly effective in coal refuse thickening, gold recovery, ccd circuits, copper leaching, molybdenum processing and other mining and. Like the high rate thickener, the paste thickener uses high floccu lant dosage and optimised feed. Testing is required for the selection of correct thickener or clarifier size and configuration for your application. To illustrate, if waste activated sludge, which is typically pumped from secondary tanks with a content of 0. Fully automatic high rate thickener mild steel tank, supporting structure and conditioning rakes supplied as standard static bridge to mount motor gearbox. Download download thickener design methods pdf read online read online thickener design methods pdf continuous thickener design thickener sizing calculation thickener operation manual thickener volume calculation thickener design calculations pdf high rate thickener design calculations thickener design equations thickener area calculation thickening of nonideal. Equitable clarifier influent flow distribution is a critical clarifier operational performance. To be able to consistently dewater the tailings slurry to a nonsettling and nonsegregating suspension, westech deep bedtm paste thickener design includes. Why highrate thickeners are now preferred by the gold industry.
The circular class of high capacity thickener is similar in general form to a conventional circular basin thickener, but cylinder diameters are limited to between 4 and 18 m see figure 1. Azfab high rate thickeners are designed to recycle 90 percent of your wash plant water. In table i of the july article, improve clarifier and thickener design and operation, by joel christian pp. The distribution of solids is less concentric for the side feed and bottom shelf conventional designs. Highrate thickeners are designed to provide roughly 12 times the throughput of conventional machines of similar size. The thickener controller adjusts the mass flow rate of the underflow in response to the influent mass flow signal. That signal is fed to a thickener controller which also monitors mass flow of the underflow. The grabcad library offers millions of free cad designs, cad files, and 3d models. Recycle on average 92% of the water used in a wet plant. Sizing a high rate thickener thickening, filtering, ccd. The following is a short cut to designing your own thickener.
Units are constructed from steel and include a cylindrical top portion, an inverted cone bottom section and an angled rake system mounted on a central. 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. Where and to the extent that removals are governed by settling rates, such. We work with you to address your specific process challenges that affect your thickener and clarifier selection. Thickener sizing and the importance of testwork, especially for paste posted by matrix on 23rd march 2010 international minings monster april issue, including the annual paste supplement is. 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.
Ras rate is the volume of settled sludge collected from the bottom of the secondary clarifier and returned to the influent of the upstream aeration basins. Westech hiflo highrate thickeners are used in many types of process circuits to separate liquids and solids at very high rates. Testwork and sizing for paste thickeners international. Altaflo highrate thickener westech engineering, inc. The cfb 450 sludge thickener as per request grabcad. High rate thickener hrt is a relatively old concept in the world market by now. It has a flocculent mix chamber, inclined settling plates and automatic sludge level control system. The thickening equipment of gold cyanide factory adopted hydraulic motor driving center thickener, the capacity does not meet expected goals, and the timing of rake lost working hours, the working efficiency is low. Tailings management sustainable and complete dewatering solutions. Sludge thickening is a process in which the solids concentration is increased and the total. The high rate thickeners became popular in the mid 1980s and are relatively newcomers to the sedimentation line of equipment. Which value of impact factor is recommended in sizing a high rate thickener. Thickener tanks, rakes and feedwells are custom designed.
To facilitate us in giving you a proposal we would like the. Tailings management sustainable and complete dewatering. Fully automatic high rate thickener mild steel tank, supporting structure and conditioning rakes supplied as standard static bridge to mount motor gearbox heavy duty shaft and rake. Hi rate thickeners type typical thickener dimensions they produce a wide variety of thickeners, size up to dia.
Demonstrate an understanding of thickener operation and operator control high rate thickeners are designed specifically to maximise the flocculation efficiency of manual rake lifting devices consist of a hand wheel and worm to raise or. Thickener with central transmission, view thickener with central. Advantages water reclamation and makeup water minimisation reduces costs minimised tailings management facility tmf area footprint can be less than 50% of a conventional tsf. They differ from conventional thickeners in feed well design, size and control. 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. Unlike conventional thickeners, high rate thickeners must use flocculants. Ras rate is the volume of settled sludge collected from the bottom of the secondary clarifier.
Highrate thickeners in developing our highrate thickeners, we draw upon decades of experience in flocculation, feed dilution, and sedimentation technology from eimco and dorroliver. Find details of companies offering high rate thickeners at best price. Existing slant plate clarifiers were misapplied to the process and were unable to properly separate the dense, sticky solids contained in the liquid stream. Thickener design pdf, mining thickener, thickener tank.
Magra highrate thickener presentation 2011 chemical. The principles of flocculation have been further adapted to a new design that will thicken slurries at an even higher rate than a typical highrate thickener. Influence of the thickener particles submicron boron nitride as a grease thickener. Equipment questionnaire magra process engineering pty. The velocity indicated on the left column is the magnitude of the thickener flow region shown in the images to the right. Feed densities up to 55 % discharging underflow at 70 % solution could be halved no other thickener can compare. The phenomenological theory of continuous thickening of flocculated suspensions in an ideal cylindrical thickener is provides a method for thickener design. Chapter 3 sludge thickening thickening is a procedure used to increase the solids content of sludge by removing a portion of the liquid fraction. Equipment questionnaire magra process engineering pty ltd. Reclaiming water quickly and efficiently can improve your operation and your bottom line. The principle of paste thickeners is that the compression zone is much deeper than on either high rate hrt or high compression hct units. The thickening process is the primary method of producing high solids slurries for the minerals. 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.
Understanding the thickening process australian centre for. Analysis of a range of industrial thickeners from the processing of gold ores, red. Azfab high rate thickener recycles water by separating the liquid from the solids. Sludge thickening an overview sciencedirect topics. The key features for highcapacity thickeners are the feedwell design and the feed slurry dilution method. Heap biooxidation and gold recovery at newmont mining. Thickener with central transmissionon this product details page, you can find 1,equipments purpose. Gnyz highrate and highpressure thickener is a new type of high can be applied according to users requirements. A concentration of 20% solids, which might be achieved by mechanical dewatering discussed in the next section, results in a 95% reduction in volume, with resulting savings.
A gypsum manufacturing plant was having trouble effectively treating its plant wastewater. High rate thickeners high rate thickeners are designed specifically to maximise the flocculation efficiency of flocculants. The purpose of such an override is correction for errors in the mass control signal as well as for changes. Nov 25, 2017 download download thickener design methods pdf read online read online thickener design methods pdf continuous thickener design thickener sizing calculation thickener operation manual thickener volume calculation thickener design calculations pdf high rate thickener design calculations thickener design equations thickener area calculation thickening of nonideal suspensions such as. Thickener concentrates the sand, and clarifies the water. With reference to figure 93, a sludge with 1% solids thickened to 5% results in an 80% volume reduction since 5% 120. Thickening, filtration and clarification in the phosphoric.
Join the grabcad community today to gain access and download. Fully automatic high rate thickener mild steel tank, supporting structure and conditioning rakes supplied. Lamina or tube settlers and solids recirculation units lamina thickeners they contain spacecutting baffles that intercept settling paths at many levels. 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. The lamella gravity settler thickener lgst design is a highrate gravity settler combined with a circular, picketfence sludge thickenerscraper. Highrate thickeners have shown themselves to be more costeffective than conventional thickeners in recovering water and cyanide in gold mines, and other. The basic design of a high rate thickener is below. The outotec hct has been designed with a smaller footprint and higher walls than our high rate thickener or conventional thickeners. 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. One example is the high rate thickener, which must have some degree of automation for efficient normal operation. The westech deep bedtm paste thickener is the latest advancement in the evolution of this style of thickener.
However, fluctuation of an interface level between clear and unclear areas of the thickener can effect flow rate adjustment. During the last decade, various methods have been utilized in sizing a thickener such as coe and clevenger, talmage and fitch and wilhemnaide. On this basis, the client increased two improved hydraulic motor driving center thickener. The increase in flocculation efficiency realised in high rate thickeners. Which method is superior recommended in sizing a high rate thickener. The highrate thickeners became popular in the mid 1980s and are relatively newcomers to the sedimentation line of equipment. Thickeners and clarifiers complete range of reliable and cost. This paper aimed to study of the behaviour of organic thickener in the grease formulation. There are two basic types of high rate thickener units. Pdf understanding the thickening process researchgate. Achieve a higher density underflow with our high compression thickener. The central drive thickener mainly used in the process of concentrate and tailings dehydration, equipment filtration equipment goldsmelting equipmentdry method and wet method cylinder sieve ungrouped.
Outotec directional autodil and outotec turbodil are the first thickening systems to autodilute feed while optimizing performance and flocculant consumption. High torque thickener clarifier monroe environmental. The top countries of suppliers are china, india, and pakistan, from which the percentage of high rate thickener supply is 97%, 1%, and 1% respectively. Deflector plate feedwell radflow feedwell perturbed area feedwell type comparison in scale model thickeners both running at 3mhr rise rate. Mar 24, 2017 azfab high rate thickener recycles water by separating the liquid from the solids. The rate of sedimentation should be as high as reasonably possible to both increase. As the compression zone gets deeper, the underflow density for a given flux rate increases, as a result of two factors. The system can reduce and in conjunction with other equipment completely eliminate the need for settling ponds.
Magra highrate thickener presentation 2011 free download as powerpoint presentation. 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. Thickeners and clarifiers complete range of reliable and. Hrts with interestingly different design features, have overcome many of the disadvantages of a. High torque thickener clarifier for gypsum sludge challenge. Preparation of grease using organic thickener pdf free.
Furthermore, they are normally positioned far away from. They are highly effective in coal refuse thickening, gold recovery, ccd circuits, copper leaching, molybdenum processing and other mining and chemical flowsheets. The advantages of sludge thickening in reducing the volume of sludge to be handled are substantial. Fully automatic high rate thickener mild steel tank, supporting structure and conditioning rakes supplied as standard static bridge to mount motor gearbox heavy duty shaft and rake assembly, with full walkway access fully preassembled and factory tested automatic desludge facility. Theory and application of thickener design a g waters abstract theory the sedimentation vessel has a constant crosssectionalarea the process is onedimensional and so there is no radial variation in concentration for any horizontallaycr iii the slurry can be treated as a continuum with a continuous liquid and solid phase interacting with each. 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. 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. Solids settle out onto the baffles and are removed from suspension after settling only a short distance. Forceddilution devices on the feed line to a 42 m high rate thickener. Improve clarifier and thickener design and operation. Thickeners are utilized in various solidliquid separation processes in order to increase the density of a process stream.
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