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Care needs to be taken with the nomenclature of conventional or high rate thickeners. The critical difference is the use of feed dilution and flocculation in high rate thickeners over conventional thickeners; however, the high rate thickener has become so ubiquitous in the mining industry it has become the ''conventional'' choice.
Most thickeners operate with all three regimes present – certainly in any high rate thickener where feed dilution is used. One of the regimes will be the ''rate determining step'' and this, together with the requirements of the process performance, will be the factor that determines the size and design of the equipment.
Jul 11, 2016· Paste Thickener Design Variables Paste thickeners are uniquely different than conventional and highrate thickeners. Highrate thickeners, that produce a settling slurry underflow, have been in use for decades. Thickener selection is based on feed characteristics and standard benchscale tests combined with experience.
Say, we have a coal tailings application and testwork shows a rise rate of 2 m/h with a pulp feed flow rate of 200 m. 3 /h. ... A factor (Z‐Factor) is used based ... Therefore for a 12m diameter high rate thickener with the coal tailings duty, we can use medium duty (K‐Factor of 15) ...
offers 375 coal thickener products. About 13% of these are mining thickener, 8% are paper chemicals, and 6% are petroleum additives. A wide variety of coal thickener options are available to you, such as coating auxiliary agents, leather auxiliary agents, and petroleum additives.
In this case the pattern would be a deep cone thickener equal to the existing paste thickeners, having dimensions of 10 meters in diameter and 14 meters high in the shell side, which had a scraper mechanism, and which was obtaining a solids content of 30 to 21 underflow in wt% compared to 1517% obtained in conventional thickeners.
The Delkor Paste Thickener takes all the knowledge and experience of over 30 years providing thickeners . Shear Thinning System Available . Flocculant dosing is controlled by means of a bed level detection device . Conventional, High Rate, High Density, Ultrasep and Paste Thickeners treat a variety of materials in a . »More detailed
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
Paste and high rate thickening are emerging as a significant way to maximise water efficiency in Australia''s coal industry. Outotec has designed and installed the firstever paste thickener in Australia''s coal industry and has won five further orders recently for paste and high rate thickeners.
High Rate Thickeners High rate thickeners are designed specifically to maximise the flocculation efficiency of flocculants. They differ from conventional thickeners in feed well design, size and control. Unlike conventional thickeners, high rate thickeners must use flocculants. The basic design of a high rate thickener is below.
Factor TABLE 2 FACTORS AFFECTING GRAVITY THICKENING PERFORMANCE Effect Nature of the solids feed Freshness of feed solids High volatile solids concentrations High hydraulic loading rates Solids loading rate Temperature and variation in temperature of thickener contents High solids blanket depth Solids residence time Mechanism and rate of solids withdrawal Chemical treatment Presence of ...
Sep 13, 2013· gravity to the thickener and shall have the energy to aid mixing of flocculant solution with it. The feed well is sized adequately to take care of the venting of the entrapped air in the feed slurry.
Tailings from coal washing plants; Recycled water from aggregate washing . The Thickener Components. As mentioned previously most of the highrate thickeners subassemblies are similar to those of conventional thickeners except for lifting devices that .
How a Thickener Works. Previous Next ... Factors affecting Thickening rates. ... High Rate Thickeners. Gallery High Rate Thickeners . BUY Laboratory Small Plant Process Equipment We have all the laboratory and plant equipment you need to test or build/operate your plant.
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.
Thickeners. Thickeners — or Clarifiers, depending on the application — can be used to recover immediately reusable process water, as well as extract fines and other materials. Thickeners can be used by mineral and aggregate producers, as well as by environmental contractors in industries such as wastewater management.
Both highrate thickeners and dewatering centrifuges are used in the application of dewatering coal tailings. Both applications are well advanced and accepted as means to dewater coal. This paper compares a highrate thickener to a solid bowl centrifuge with respect to numerous process, mechanical, electrical,
MIP Thickener Design The following is a short cut to designing your own thickener: (a) Size of Thickener As a first stab we can either use the thickener flux (m2/tpd) or the rise rate, depending if solids loading is the dominant (eg.
Optimized thickeners in coal preparation plants Using optimized thickeners for level measurement applications in a coal mind can yield safer and more efficient plant control. Level measurement equipment is part of almost every process in a coal mine. You hardly see the
In underground mining, the WesTech Deep Bed™ Paste Thickener is an emerging option to the conventional solution of highrate thickener/vacuum filter for paste backfill applications. There can be a number of factors which make paste thickening an attractive alternative.
• 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. We have standard "off the shelf" designs available. Thickener tanks, rakes and feedwell''s are custom designed,
If a high concentration of solids in the feed lowest capacity (maximum level) to determine the is used with flocculant, thickener overflow can dilute feed dimensions of the thickener are obtained (Coe and Clevenger, and can increase sedimentation rate and clarity.
In Table I of the July article, "improve Clarifier and Thickener Design and Operation," by Joel Christian (pp. 5056), the titles Vi and TSS are reversed. The first TSS is and the first Vi is In the overloaded case on p. 55, the underflow c oncentration should be 240 kg/m 3, not 140. Also, the dashed line in Figure 9 is not used in ...
LETTER FROM AUSTRALIA Why highrate thickeners are now preferred by the gold industry by Allan Waters BHP Research New Technology, Shortland, NSW Highrate thickeners have shown themselves to be more costeffective than conventional thickeners in recovering water and cyanide in gold mines, and other mineral processing plants.
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