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The rise rate in early thickener designs was often below 1 m/h and has increased to match the evolution in design. The performance demanded from flocculants to delivery effective flocculation has closely followed. The role of flocculant was important to the development of thickener operation and control (Labbett et al, 2006).
Conventional thickeners, High compression thickeners and clarifiers. The key advantages of a High Rate Thickener over a conventional thickener are as follows: Some of key features of the MBE High Rate Thickener are • The HRT is designed specificallyto operate with flocculantsand hence optimises flocculant consumption.
Like the High Rate thickener, effects of feed rate, flocculant dosage and flu x rate on thickener underflow and . overflow results. (Pearce 1980). Continuous raked cylinder test s consume more
ANDRITZ thickening and clarification solutions are designed to achieve the highest production rates without compromising efficiency. For all countercurrent decantation (CCD) plants: The new and improved ANDRITZ interstage mixing and dilution system for CCD circuits helps to reduce the footprint and consequently cut CAPEX while maintaining low operating costs.
Table of ContentsFloccule DestructionFlocculant DilutionFeed Solids At startup, the relatively high level of feed solids, 1720%, called for in design led to difficulties in achieving the degree of flocculation necessary to meet required settling rates. It was recognized that decreasing feed solids would improve thickener performance while reducing flocculant consumption (Figure 2). This was
The thickener controller adjusts the mass flow rate of the underflow in response to the influent mass flow signal. However, fluctuation of an interface level between clear and unclear areas of the thickener can effect flow rate adjustment. The purpose of such an override is correction for errors in the mass control signal as well as for changes in flocculant feed rate. This invention can be
HighRate Thickener (HRT) Highcapacity thickener operates on the principle of using the polyelectrolyte polymers more efficiently than in a conventional thickener. It has a flocculent mix chamber, inclined settling plates and automatic sludge level control system.
High rate thickener feed wells are designed to disperse flocculants thoroughly into the feed end to admit the flocculated slurry into the settling zone of the thickener without destruction of the newly formed floccules. ANDRITZ thickening and clarification systems
High Rate Thickening is a process whereby mineral particles are flocculated, thoroughly mixed within a feedwell and then injected uniformly into a hindered settling zone in the thickener with largely radial motion. A pre formed hindered settling zone allows horizontal distribution of incoming feed into the settling bed which, at the point of injection, is in a fluidised state. The radial
Standard bridgesupported highrate thickener designs are available for accelerated delivery, and include either welded or bolted elevated steel tank designs up to
Proprietary feedwell designs are offered by vendors of high rate thickeners that are claimed to help optimise flocculation. High rate thickener designs allow flocculated particles to exit the feedwell under low shear conditions into a free settling zone directly above the hindered settling zone.
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. By adding flocculants and increasing the depth of the solids
35m diameter Pb/Zn tailings High rate bolted thickener ANDRITZ thickening and clarification solutions are designed to achieve the highest production rates without compromising efficiency. For all countercurrent decantation (CCD) plants: The new and improved ANDRITZ interstage mixing and dilution system for CCD circuits helps to reduce the footprint and consequently cut CAPEX while
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The control parameters used to maintain stable operation in highrate thickeners are underflow solids density, underflow withdrawal rate, flocculant dosage, solids inventory in the tank, solids feed rate, and mechanical torque limit restriction of the rotating rake arm mechanism. Loweryield stress muds, as produced in a highrate thickener, require less torque to move rakes through the mud.
High Rate Thickening is a process whereby mineral particles are flocculated, thoroughly mixed within a feedwell and then injected uniformly into a hindered settling zone in
Thickener Flocculant Feed Pipe Manufacturer; Thickener Operation and Flocculant Application. Laboratory testing with a high rate thickener has shown the importance of feed solids control to thickener and flocculant performance (Table 4). In the preoxidation as well as CCD thickeners, testing has demonstrated that an optimum feed solids level
improvement in the efficiency of flocculating agents. Therefore, highrate thickening is mostly applied to tails and slimes but not so often to metallurgical concentrates such as iron ore where the settling rates are very high and the underflow reaches its ultimate density almost instantaneously.
thickener flocculant feed pipe manufacturer Guar Gum . Manufacturer of guar gum guar gum powder industrial guar gum powder cassia tora powder food grade guar gum powder for food act as emulsifier thickener binding agent stabilizer Hydrocolloid Geling agent Soil Stabiliser Natural fiber Flocculant Fracturing agent moisture retention improves texture and viscosifier in pet food beverages bakery
high rate thickener flocculant feed pipe lithuania. Jan 26 2015 · Flocculants are typically introduced either to the slurrywater pipe feeding the thickener to a feed tank before the thickener to the centerwell or a combination of these addition points Where flocculant is optimally dosed is typically determined by plant evaluation and varies from operation to operation and is influenced by
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