Roping: Is it an optimum dewatering performance condition …
In hydrocyclones, the phenomenon of roping has been attributed either to elevated levels of feed solid concentration or to relatively coarser size particles in the feed resulting in …
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Experimental hydrocyclone roping models
Chemical Engineering Journal 80 (2000) 289–293 Experimental hydrocyclone roping models Kari Heiskanen∗ Department of Material Science, Helsinki University of Technology, PO Box 6200, Vuormiehentie 2a, 02015 Espoo, Finland Abstract Hydrocyclone roping has not been studied and modeled in true grinding circuits. ... It will cause low Du /Do ...
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(PDF) Influence of the feed particle size distribution on roping …
The air core and the underflow discharge have a particular relationship given by the operating conditions. The increase in inlet pressure or the particle size distribution in the hydrocyclone feed generates a reduction in the air core that tends to cause roping. In roping cases (V and VI) the air core disappears (see Fig. 10).
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Development of a vibration sensor-based tool for online …
The commencement of roping in a hydrocyclone is attributed to changes in its design and operating variables. ... which eventually causes collapse of the air core (Fahlstrom 1963; Lynch, Rao, and ...
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(PDF) Air core and roping in hydrocyclones
Bustamante could predict the occurrence of roping in a hydrocyclone by operating it with water only. He performed the following experiment: Starting with a low, feed pressure, in a hydrocyclone with an apex to vortex ratio of less than 0.34, the water flows from the apex with no overflow through the vortex.
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Hydrocyclone classification optimization using real …
Some causes of very coarse material and large particle events include: SAG (Semi‐autogenous Grinding) mill grate, screen or trommel panel failure Hydrocyclone roping or liner/wall failure Degradation or failure of SAG mill pebble removal system
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Hydrocyclone Cut Point
As the pressure decreases, the liquid velocity decreases. This causes a decrease in the centrifugal force that is created when the liquid goes through the hydrocyclone. As a result, the particles that had been thrown to the outside wall of the hydrocyclone are no longer able to stay there, and they start to fall back down. This is known as roping.
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Influence of the feed particle size distribution on roping in
Bustamante (1991) claimed that the main factor in the generation of roping is the ratio of apex to vortex diameters. He used a 6-inch Krebs hydrocyclone operating with water and observed that when d u /d o < 0.34 the diameter of the air core reached that of the apex and blocked the pulp flow through it. He claimed that this same condition, when working with pulp, …
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Hydrocyclone operation at the transition point rope/spray …
Semantic Scholar extracted view of "Hydrocyclone operation at the transition point rope/spray discharge" by T. Neesse et al. Skip to search form Skip to main content Skip to account menu ... Roping in hydrocyclones is a well-known phenomenon in mining and mineral industries which put serious restrictions on their continuous and maintenance free ...
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Hydrocyclone Working Principle
The third type of classification used in mining is the Hydrocyclone, commonly called a Cyclone. Unlike the others it has no moving parts and is worked in conjunction of another piece of equipment, a pump. To understand the Hydrocyclone Working Principle we must first know its components. Beginning at the top, there is the OVERFLOW DISCHARGE.
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Roping: Is it an optimum dewatering performance condition in …
Hydrocyclone roping has not been studied and modeled in true grinding circuits. ... the limited capacity of the apex valve and the changes in the flow field within the hydrocyclone cause ...
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Numerical investigation of the hydrocyclone vortex …
dependence of hydrocyclone performance on feed. Roping is a phenomenon that is yet primarily unknown. Because of variations in cut size and flow split, it has significant ... hydrocyclone cause ...
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TRANSITION FROM SPRAY TO ROPING IN …
Laplace equation, Concha, et al. (1996) indicates that, for this water only hydrocyclone, dd av / 0.34 roping always exist and for dd av / 0.50! there is no roping or all operating conditions. In ...
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Hydrocyclones discharge
Most hydrocyclones are of a balanced design. A properly adjusted, balanced hydrocyclone has a spray discharge at the underflow outlet and exhibits a central air suction core. Many balanced hydrocyclones can be adjusted so that when water is fed under pressure, nothing discharges at the apex. Conversely, when coarse solids are added to the feed slurry, …
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Using IIoT to prevent hydrocyclone roping |
Key causes of hydrocyclone roping and how to prevent it. Roping can occur when pressure is increased without achieving the required slurry density, which differs according to the application. For example, hydrocyclones processing low density materials such as tailings slurries are less prone to roping. However, as most mill circuits process ...
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Hydrocyclone (Narasimha-Mainza)
Description. This article describes the Narasimha-Mainza model for hydrocyclone size classification.. Narasimha et al. (2014a) describe an empirical hydrocyclone model that improves on the Plitt and Nageswararao approaches with the addition of several features:. A sharpness of separation equation
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How MHC™ hydrocyclones and the CycloneSense™ enable
The CycloneSense™ allows operators to see inside the hydrocyclone. It provides a direct, continuous and robust online measurement of the hydrocyclone air core, turning the hydrocyclone into a smart and connected asset. With CycloneSense operators are able see when the hydrocyclone is operating with an air core.
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Hydrocyclone (Nageswararao)
Several methods are available to identify the potential for roping discharge from a hydrocyclone underflow. Plitt proposed that roping may occur when when the volumetric feed rate to the cyclone, (m 3 /h), exceeds a solids capacity limit: > Plitt further proposed a limit ...
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Hydrocyclone Monitoring | Mining, Minerals & Metals
Under certain conditions roping and plugging can occur where the hydrocyclone ceases to classify the particles,the shapes of the discharge are visibly different than normal operating conditions. ... Plugging reduces recovery efficiency, can cause flotation cell damage, and reduces overall availability while the situation is addressed. ...
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WO2017197451A1
In operation, the underflow discharging from the hydrocyclone (e.g. at the outlet or apex of the hydrocyclone) causes the body to vibrate. The sensor senses or detects this vibration and the detected vibration may be used to determine a flow condition of the underflow. ... Hydrocyclone roping detector and method WO2010089309A1 (en) * ...
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Using IIoT to prevent hydrocyclone roping |
Experiencing issues with hydrocyclone roping? We take a look at how you can prevent roping with best practice circuit design and IIoT technology. 13th January 2020
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Flow Pattern in Hydrocyclones
At a given condition, the air core completely obstructed the apex and there was no underflow. The same condition when no underflow occurred when operating with only water coincided with the onset of roping when the hydrocyclone was operated with pulp [3, 34]. This late recognition of the importance of the air core in hydrocyclone operation is ...
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Calculating Hydrocyclone Performance in Sand Washing …
Roping compromises the performance of the Hydrocyclone and causes it to act more like a traditional pipe tee than a classifier. Roping (shown on the left) alongside ideal Hydrocyclone underflow (right). The Separator™ configuration of the Hydrocyclone removes the highest amount of water from the underflow, thereby decreasing the fines bypass.
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Operational state detection in hydrocyclones with convolutional …
Video material of fanning and roping operating conditions in hydrocyclones were sourced online (Appendix A) and from industry donations. Roping footage from the laboratory cyclone system used in Section 2.1, but filmed with a Panasonic Lumix DMC-FT2 hand-held camera, were also collected to expand this class' dataset.
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How ® IIoT technology enhances the performance …
Increasing pressure within a hydrocyclone cluster will cause a hydrocyclone to enter the second and most ideal stage, called 'semi roping'. With semi roping, the metallurgical parameters inside the hydrocyclone are improved for a n optimised classification and separation process. Semi roping prevents the overconsumption of fines and allows ...
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Spigot Design Modification to Alleviate Roping in …
The experimental observations revealed that in the operation of a 50.8-mm-diameter hydrocyclone, roping ensued at 10% to 12.5% (wt%) feed solid concentration depending on feed inlet pressure for ...
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The Top 5 Things You Need To Know About Hydrocyclones
The Hydrocyclone Efficiency Curves are affected by many operating factors such as feed density, apex and vortex sizes and feed pump pressure. These factors will cause your cyclone classification to operate …
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(PDF) Air core and roping in hydrocyclones
The experimental observations revealed that in the operation of a 50.8-mm-diameter hydrocyclone, roping ensued at 10% to 12.5% (wt%) feed solid concentration depending on feed inlet pressure for ...
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Roping HydroCyclone -Bad Operation
HydroCyclone Roping – Incorrect Cyclone Operation is often caused by too high a volume feeding into the cyclone. If the apex capacity …
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Improved Mining Operations by Detecting Roping …
One of the most ubiquitous operations in any mine is the use of hydrocyclones (cyclones) in the comminution circuit to sort particle sizes for mineral processing. Downstream of this process is the flotation circuit, which …
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