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Thickeners - High rate Conventional Types by The Eimco-KCP Ltd. EIMCO-K.C.P. Thickeners are available in different types and sizes for every kind of service for the chemical, mining, pulp and paper industries and for industrial waste treatment. The...
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High-rate thickeners that are built as dedicated machines are available in sizes up to 40 meter diameter but retrofits of conventional thickeners are often larger in size. When viewed from the outside high-rate thickeners look very much like conventional machines except that their tanks have a
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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.
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Concepts of Conventional and High Capacity Thickeners Conventional Thickener The name Conventional Thickener is used for equipments with short feedwells, where the flocculated pulp leaves the feedwell and enters into the settling zone of the thickener well above the sediment level.
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The increase in flocculation efficiency realised in high rate thickeners may increase in a bulk settling rate 2 to 10 times over that obtained in a conventional thickener, thus reducing the unit area requirements by a similar factor. The corresponding volume may be 4 to 15 times smaller than with conventional thickeners in the same application.
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ers. Hence, for a given sluny rate, selection of a high Plint of the thickener. Much higher handling rate, tnd lower capital cost are obvious advantages of high lents and the concems of operational cost, especially keep some engineers selecting conventional thickeners. Forty years after the first high capacity 363 ICKENERS, A BETTER CHOICE TO MAKE
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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. Likewise, thickeners are often used for storage to facilitate the continuous feeding of downstream filters ...
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• Conventional units (low operating costs) • 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
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14.5.1.1 High-Rate Thickener (HRT) High-capacity 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.
Read MoreJun 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.
Read MoreHigh Rate or Conventional thickeners, which are typically limited to about 20 or 30 Pascal yield stress. High Density thickeners are generally designed for the range of 30–100 Pa, and Deep Cone, Deep Bed or Paste thickeners for over 100 Pa. It should be noted that these designs cover a wide range. The difference between
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High overflow rates and shorter detention time vs conventional clarifiers resulting in smaller footprint Utilises the solids contact principle plus unique controlled recirculation bringing previously formed flocs in contact with the raw water. High Rate Solid Contact Clarifier - Reactor Type Full Bridge with Side Feed
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100 have been observed for selected materials in high rate thickeners. Whilst ... that the difference between the model predictions ... into account in conventional 1-D thickener models. ...
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High Rate Thickeners High Compression Thickeners Paste Thickeners Conventional Thickeners Clarifiers Solids Contact Clarifiers Lime Saturators Outotec thickeners include a number of innovative features in their design. Special attention is given to the design of
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The principles behind high rate thickeners are based on unit area and the slurry it produces will eventually segregate into solid and liquid phases. 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.
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Jan 26, 2015 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.
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a High Rate Thickener. 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 residence time is normally associated with High Density thickeners (High Rate thickeners have residence times less than this).
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Feb 10, 2014 Based on these limiting unit areas and the feed rate of 25 t/h (dry solids) to the thickener and considering a safety factor of 1.25, the diameters of the required thickeners were calculated to be 18.8 and 16.7 m for the decantation and conventional procedures, respectively. Note that the limiting unit area was determined here solely by looking ...
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SOLUBLE METAL RECOVERY IMPROVEMENT USING HIGH DENSITY THICKENERS 363 The above is based on ± 95% interstage mixing efficiencies between CCD stages. It can be seen in the above analysis, selecting high density thickeners rather than high rate thickeners, means that 5 stages can be used instead of 6 stages to achieve the required wash recovery.
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The high density underflow in the (HDT) thickeners beg an to replacing the conventional thickeners and HCT`s in the manag ement of mining waste , as treatment needs g rew with large m ineral ...
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High Rate Conventional types / Hydraulic Mechanical Drives. EIMCO-K.C.P. Thickeners are designed for continuous operation in metallurgical, ore processing, Chemical Industries and also for the water treatment plants. Equipments are designed to accommodate the more sophisticated processes with emphasis on dependable and low cost operation.
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Simply put, Thickeners focus on the settled solids, and clarifiers focus on the clear overflow liquor — the name given to a solution free of suspended solids. Clarifiers. A clarifier will typically treat a low-density slurry of less than 5% weight per weight solids with a focus on producing a clear liquid with suspended solids of less than 100 parts per million (ppm).
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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
Read MoreHigh Rate Conventional types / Hydraulic Mechanical Drives. EIMCO-K.C.P. Thickeners are designed for continuous operation in metallurgical, ore processing, Chemical Industries and also for the water treatment plants. Equipments are designed to accommodate the more sophisticated processes with emphasis on dependable and low cost operation.
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If rates are high, there will be insufficient detention time for settling. ... Table 6 estimates annual staff hours based on conventional thickener area. ... thickener overflow rate is too low Overflow rate is too high, thickened solids pumping rate is too high, short circuiting of flow through tank Heavy accumulation of solids, foreign object ...
Read Morea High Rate Thickener. 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 residence time is normally associated with High Density thickeners (High Rate thickeners have residence times less than this).
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Under our assumptions, a three-stage CCD circuit using paste thickeners outperforms a four-stage CCD with high-rate thickeners (97.6% vs 96.2%). The process choice is clear, unless high volumes of wash water are justifiable; which of course depends greatly on the values contained in the pregnant liquor.
Read MoreSep 26, 2008 Whereas the open type of feedwell was suitable for conventional thickeners, generally without the use of flocculants, the advent of High Rate and other forms of high performance thickeners
Read MoreSimply put, Thickeners focus on the settled solids, and clarifiers focus on the clear overflow liquor — the name given to a solution free of suspended solids. Clarifiers. A clarifier will typically treat a low-density slurry of less than 5% weight per weight solids with a focus on producing a clear liquid with suspended solids of less than 100 parts per million (ppm).
Read MoreSOLUBLE METAL RECOVERY IMPROVEMENT USING HIGH DENSITY THICKENERS 363 The above is based on ± 95% interstage mixing efficiencies between CCD stages. It can be seen in the above analysis, selecting high density thickeners rather than high rate thickeners, means that 5 stages can be used instead of 6 stages to achieve the required wash recovery.
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global leader in high-rate thickeners. 100+ times smaller footprint with comparable flocculant consumption to conventional rake thickeners and no moving parts. Feed densities up to 55 % discharging underflow at 70 % (solution could be halved) – no other thickener can compare.
Read MoreFeb 10, 2014 Based on these limiting unit areas and the feed rate of 25 t/h (dry solids) to the thickener and considering a safety factor of 1.25, the diameters of the required thickeners were calculated to be 18.8 and 16.7 m for the decantation and conventional procedures, respectively. Note that the limiting unit area was determined here solely by looking ...
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Understand the difference between a conventional thickener, which generally does not use the addition of polymers, and a high-rate thickener, which increases settling rate and achieves moderate underflow density with the addition of polymers. Our Thickener Terminology Guide will help you have a better understanding of the terms associated with ...
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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.
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WesTech - Conventional Gravity Thickener. WesTech's complete line of high rate, heavy duty thickeners offers the most advanced designs for use in the industry. WesTech equipment is engineered and manufactured to the highest standard in quality. It offers the precision and durability required to keep your process going.
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This is normally achieved by using compression (or high rate) thickeners or a combination of thickeners and filter presses. High Density Thickened Tailings (HDTT) are defined as tailings that have been significantly dewatered to a point where they will form a homogeneous non-segregated mass when deposited from the end of a pipe (Welch 2003).
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