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Determining these equivalent shape factors is an important achievement in mineral processing. Researchers can simply put these factors in chein''s equation to calculate settling velocity and design thickener instead of doing time consuming experiments and modeling.
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.
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 ...
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 .
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. A deep cone, or deep bed, thickener produces paste. Both high density and deep cone thickeners depend on retention time rather than area.
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 ...
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.
Aug 08, 2018· Working of a Thickener. Let us understand in detail about how thickeners work. To start with, it works on the principle of Gravity sedimentation and the most common construction of a thickener ...
The AMIRA P266 ''Improving Thickener Technology'' series of projects has sought to provide a firm scientific basis for feedwell and thickener design, a requirement as pressures on water usage in the ...
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) ...
The affect of PSD variations is that the yield stress curve will shift to lower wt% or high wt% depending on if the PSD is coarser or finer. The PSD is the variable that changes the most at any mineral processing plant. This fact is less important to high rate thickeners but very critical for paste thickeners.
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.
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 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.
100 have been observed for selected materials in high rate thickeners. Whilst ... Understanding the Thickening Process ... that one or more of the above factors may be prevalent. ...
Unformatted text preview: 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. Platinum Tailings) or feed flow rate ( Clarification or low feed solids). Say, we have a coal tailings application and testwork ...
HiFlo™ Highrate Thickeners Overview: WesTech HiFlo™ highrate thickeners are used in many types of process circuits to separate liquids and solids at very high rates. They are highly effective in coal refuse thickening, gold recovery, CCD circuits, copper leaching, molybdenum processing and other mining and chemical flowsheets.
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.
Dewatering to higher densities — an industry review F. brunn FL Inc., United States of America ... These and other factors have led to more and more plants using high density and paste ... High Rate thickeners were pioneered in the sugar industry .
• 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 diameter pilot scale to 300ft diameter. We have standard "off the shelf" designs available.
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.
White paper: 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. Finally, we will discuss the process of modernizing a thickener so as to achieve the client''s stated outcomes.
Jan 18, 2018· The concept of bolted thickeners is growing in popularity as a fitforpurpose, high quality dewatering solution with reduced project construction risk and duration. The benefits offered by bolted thickeners have resulted in FL securing an order in July 2017 for a 24 m diameter highrate thickener from a South African iron ore mining company.
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