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either retained in the tailings voids or lost to seepage and evaporation. Water usage efficiency can be improved significantly by thickening tailings, because the thickener overflow is re-tained within the plant circuit and is therefore not exposed to such losses. Mudder et al. (2001) describe approaches to determining the overall water balance ...
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THICKENED TAILINGS FACILITIES The thickeners were designed to produce a solids concentration by mass of about 70 %. The location at the TSF of the 18 m and 24 m diameter thickeners is shown in Figure 1. The 18 m unit was initially equipped with centrifugal pumps for underflow pumping while peristaltic (hose) pumps were
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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. ... In 1964 there was a project to reprocess the huge piles of tailings that accumulated over the years and ...
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Aqueous slurries' dewatering using gravity-driven thickeners is an essential unit operation in mineral processing. Thickener feed dilution is often used for enhanced flocculation and sediment compressibility. This work investigated the effect of feed dilution on thickener performance for copper flotation tailings.
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Through three-dimensional numerical simulation on the whole-tailings flocculation and settling in deep-cone thickener using computational fluid dynamics (CFD)-PBM, the distribution of density and ...
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The simplest use of a thickener in a metal-mining operation is to get water out of a pulp; for example, in a desert country where water is too valuable to be thrown away with the tailings. There you have a thickener treating the tailings and recovering some of the water to be sent back to the mill and used over again.
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Rapid dewatering and thickening of whole-tailings with ultrafine particles is one of the most important processes for the whole-tailings paste preparation. Deep-cone thickener, a kind of such process for the flocculation and settling of whole-tailings, is particularly necessary to study. However, there exist many problems in observing the flocculation and settling process …
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The tailings thickening bed is a porous medium [40,41], when water flows through the pore structure, the actual flow path is longer than the geometry of the medium. Tortuosity is a degree of flow path twist and tear, which is defined as the ratio of the actual length of the seepage channel to the apparent length (macroscopic distance) through ...
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Meanwhile, it can be seen from the fitting straight line of the ISR that the slope of the fitting straight line decreases with the increase of tailings feeding concentration, which shows that the tailings feeding concentration is an important factor affecting the tailings thickening efficiency of the thickener, and a reasonable tailings feeding ...
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Thickened tailings, as the name suggests, involves the mechanical process of dewatering low solids concentrated slurry (Fourie 2003). This is normally achieved by using compression (or …
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This review paper aims to (I) redefine the role of mine tailings and explore their physical, chemical, and mineralogical characteristics; (II) discuss environmental concerns associated with ...
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Thickener outputs can accommodate a range of tailings disposal options from low yield stress, easily pumped suspensions for disposal in conventional 'wet' tailings dams to more concentrated ...
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Cemented paste backfill (CPB) is a key technology for green mining in metal mines, in which tailings thickening comprises the primary link of CPB technology. However, difficult flocculation and substandard concentrations of thickened tailings often occur. The rheological properties and concentration evolution in the thickened tailings remain unclear. …
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Pilot Thickening Trials: Limit Testing – Onsite pilot thickener trials using a truck mounted or small scale thickener (typically up to 5 tonnes per day) operating for a short period of time, primarily to determine limitations of thickening an existing tailings feed. These styles of trials are driven by thickener vendors to adopt high rate, high compression or paste thickening technology.
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Some of the reasons for the slow implementation of thickened tailings and paste systems include the difficulty in thickening tailings sufficiently, the difficulty in pumping high solids content slurries and a lack of understanding of slurry behaviour upon deposition, not to mention the additional capital expenditure. In
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Tailings from the process plant are often thickened to a moderate or relatively high (but still pumpable) solids concentration, depending on several parameters mainly the TSF deposition …
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Processing High Density thickener underflows and tailings enable to reduce fresh water needs and facilitate reclamation projects. However, additional water for dilution is often required to ease pumping to the filtering stages turning the pump technology into the limiting factor. INDUSTRY MINING AND MINERALS
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The Vale Goro Mine, nickel laterite tailings thickener (26 m) is dewatering the tailings stream with the goal of discharging the overflow water to the ocean. The suspended solids requirement for …
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The thickener drive unit is the mechanism that powers the movement of the rake mechanism in a thickener. The drive unit is typically located at the top of the thickener tank and has a robust design to handle significant hours of …
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Additionally, thickeners are equipped with a rake mechanism that helps move the sediment to the underflow outlet. The processed tailings are later transported through pipes, with the help of centrifugal or positive displacement pumps, to the designated storage facility, which can be either a surface or underground disposal site (Concha, 2014).
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impact of significant variations in the thickening process and tailings product received. CTD overview Tailings deposition using the CTD method occurs by radial discharge from a fixed number of spigots located within the central area of the TSF. The discharge point is progressively raised as the elevation of the tailings
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Using the values typical of industrial tailings thickening operations, the feed solid volume concentration was adjusted at 6.19% (corresponding to a solid mass fraction of 15%). Before pumping, the tailings slurry was stirred evenly at a speed of 1200 rpm. The feed rate was controlled at 0.62 L/min, which corresponds to a velocity of 0.4 m/s.
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Paste/thickened tailings is characterized by the presence of a yield stress, which is the force required to initiate flow. The underflow of high-rate thickeners is "slurry," which has relatively no or only minor yield stress. Conversely, WesTech paste thickeners operate in higher solids concentrations within a yield stress range.
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FLS is a leading, full flowsheet minerals processing supplier to the global mining industry. We deliver proven technologies and services across the lifecycle of operations, and have set targets of providing solutions for zero-emissions …
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desliming options on a tailings thickener underflow density and pumping requirements. G. = VsC I =Vp2 GF]I =Vs2 III L:J x·::J iI" III 12 Gu 0 VI ill (1) BHP Central Research Laboratories, Vale St., Shortland, N.S.W. 2287, Australia The second important velocity is the upward velocity of propagation ofeach concentration in the sediment. This ...
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The tailings thickening results showed that the underflow concentrations before and after shearing were 69.6 wt% and 61.4 wt%, at bed height 30 cm, residence time 34 minutes, respectively. The rake shearing reduced the porosity of tailings bed from 46.48% to 37.46%, decreased by 19.41%.
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THICKENERS Thickeners in mineral processing can be monitored and improved by measuring density in the feed of the system, in the feedwell and in the underflow. ... According to CRC Care 2013, mining activities are producing …
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The measurable parameters that can be used for thickener control include thickener feed flow rate, feed density, underflow density, overflow clarity, bed level, bed mass, rake torque, rake height, solids settling rate and underflow rehology.
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In March 2008, Hawk introduced a new line of "fourth generation" sonar transducers for improved sensing of Interface levels in tailings, paste, concentrator and Lamella thickeners, settling tanks and CCDs. The new sensors offer big improvements in overall power, penetration and calibration density range.
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@misc{etde_5783079, title = {Control systems and operational features of the deep cone thickener} author = {Abbott, J} abstractNote = {A number of control systems for deep cone thickeners are discussed. The relationship between feed rate and underflow concentration for flotation tailings is described. Cones of different effective size have been used to investigate …
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The vast majority of tailings thickeners utilize flocculants to enhance settling. Few actually achieve the maximum potential for such enhancement, most not even approaching this maximum. This often doesn't matter when the …
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According to CRC Care 2013, mining activities are producing more than 10 billion tonnes of tailings. Also, they use thickeners as a water recovery system, to meet requirements in the recovery and reprocessing of water.
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