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The term “bed level” is widely used in the industry to refer to different settling phases in the thickener (figure 1). Some people use this term to describe the mud level, others use it to refer to the interface level or layer. To avoid any confusion, this article will use the terms mud level and interface level as
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2020-10-1 the thickener feed. Adjustable Dilution Ports Optimize flocculation and enhance settling rates. Heavy-duty Drive with Lift Ensures reliable, continued operation during high-torque conditions. Measurements Bed level and bed mass can be measured to help determine flocculant dose and underflow pumping rates for efficient and stable operation ...
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2017-6-16 Bed level is best utilized as a feedback on flocculant dosing rate, rising levels require an increase in flocculant dosing and an increase in underflow pump speed if the underflow density is high. Bed mass. Bed mass is utilized to control thickener
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2008-12-19 When Endress+Hauser asked its mining customers about the major process problems they face, high on their priority list was the ability to accurately and reliably monitor the “bed level” and “bed mass” in the tailings thickening process — and in the other thickening processes, because if these could be measured, the efficiency of the thickeners could be improved.
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In the thickener process there are many critical key performance indicators that show how the process is running – all of which need to be measured accurately and reliably. Hydraulic pressure, bed height and bed mass are some of the critical measuring points, as well as underflow density, underflow rate, overflow clarity and dry solids feed rate.
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2017-2-6 Bed Level. Outotec High Rate Thickener control Control solution The disturbances can be controlled by means of a feedforward algorithm equipped with adaptive tuning functionality to allow optimal feedforward gain to be set. This results in stable solids inventory (i.e. bed mass) control down the circuit, and therefore stable bed level and density control is maintained.
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2015-12-4 Bed mass is calculated based on the total volume of combined water and solids in the tank and the total hydrostatic pressure measured near the bottom of the tank. As the specific gravity of water is a known constant, the mass of the solid content can
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1990-5-1 The use of a solids mass control system coupled with bed level control by regulation of flocculant rate has resulted in stable control of the units, 10m diameter Supaflo high-rate thickener operating at Burmine Opera- tions Copperhead gold plant at Bullfinch, Western Australia, on gold tailings which has allowed the underflow density, and hence water and cyanide recovery, to be optimised.
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Optional sensors for monitoring bed level, underflow density and overflow turbidity ensure optimal operation. Types of Thickeners. McLanahan offers a range of thickener types, including High-Rate, Ultra Rakeless, High-Density and Paste, that are tailored to an
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2015-9-10 On the one hand, if the underflow rate is too low, it is possible to make the thickener overloaded and the mineral particle loss when the mud bed level is high enough. On the other hand, if the underflow rate is too high, thickeners will be “short-circuited” when the mud bed is pumped out and the feed is directly discharged.
Read More2020-10-1 the thickener feed. Adjustable Dilution Ports Optimize flocculation and enhance settling rates. Heavy-duty Drive with Lift Ensures reliable, continued operation during high-torque conditions. Measurements Bed level and bed mass can be measured to help determine flocculant dose and underflow pumping rates for efficient and stable operation ...
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of the reading. When installed properly, bed mass is a very robust and reliable measurement, and hence a good choice for process control. 2.2.2 Bed level Typical techniques used for bed level measurements are either based on ultrasonic sonar or diver probes entering into the thickener.
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1990-5-1 The use of a solids mass control system coupled with bed level control by regulation of flocculant rate has resulted in stable control of the units, 10m diameter Supaflo high-rate thickener operating at Burmine Opera- tions Copperhead gold plant at Bullfinch, Western Australia, on gold tailings which has allowed the underflow density, and hence ...
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2019-6-30 resulting in larger disturbances in the Bed Mass. By the time it reaches CCD 5, the Bed Mass control is subject to unacceptably large fluctuations adversly affecting operating parameters including Underflow Density and Bed Level. Outotec® High Rate Thickener control Control solution The disturbances can be controlled by means of a
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Optional sensors for monitoring bed level, underflow density and overflow turbidity ensure optimal operation. Types of Thickeners. McLanahan offers a range of thickener types, including High-Rate, Ultra Rakeless, High-Density and Paste, that are tailored to an individual application. They can be used as stand-alone solutions or in conjunction ...
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The Bed Mass 2 provides an indication when the bed level is above the knuckle. The relationship between the Bed Mass 2 and the underflow density shows no trend. The Bed Mass 1 and the Bed Mass 2 relationship to the underflow wt% is compared in Figure 5. If the full bed volume is properly active, then the greater the Bed Mass 2 values should ...
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2015-12-4 Most mining process operators agree that one of their major challenges is to monitor the bed-level and mass of their thickeners, which, in conjunction with other critical process parameters, allows the optimisation of thickener efficiency. Bed-level. The bed-level is the interface between the aggregated solid material and the process water.
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Flocculant pump failure• Check pump operation • Change over to the standby flocculant pump.Bed level is too high.• Lower the bed level by, increasing the underflow output rate (ie open the discharge valve further). • Divert the thickener feed to a bypass.Bed level lower than the bottom of the feed well.•
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2015-8-13 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.
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Finally a very important factor is to understand the thickener operation and to from MECANICA 12 at Carreras Profesionales en Ingeniería y Tecnología
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2019-7-18 The WesTech HiFlo™ high-rate thickener is used in many types of process circuits to separate liquids and solids at very high rates. It is highly effective in coal refuse ... Bed level and bed mass can be measured to help determine flocculant dose and underflow pumping rates for efficient and stable operation. Applications
Read Moreof the reading. When installed properly, bed mass is a very robust and reliable measurement, and hence a good choice for process control. 2.2.2 Bed level Typical techniques used for bed level measurements are either based on ultrasonic sonar or diver probes entering into the thickener.
Read MoreThe Bed Mass 2 provides an indication when the bed level is above the knuckle. The relationship between the Bed Mass 2 and the underflow density shows no trend. The Bed Mass 1 and the Bed Mass 2 relationship to the underflow wt% is compared in Figure 5. If the full bed volume is properly active, then the greater the Bed Mass 2 values should ...
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2017-10-30 Description. The High-Rate thickeners became popular in the mid 1980's and are relatively newcomers to the sedimentation line of equipment. As already discussed previously Thickeners are a major component in a plant layout and occupy large spaces which may be saved by introducing high-rate machines. Furthermore, they are normally positioned far away from the center of the plant so to allow ...
Read More2015-12-4 Most mining process operators agree that one of their major challenges is to monitor the bed-level and mass of their thickeners, which, in conjunction with other critical process parameters, allows the optimisation of thickener efficiency. Bed-level. The bed-level is the interface between the aggregated solid material and the process water.
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2017-1-31 thickener: • Settling under the force of gravity • Addition of reagents such as fl occulants, which are mixed with the incoming feed to enhance gravity settling such that it occurs faster or at a higher rate • Bed compression due to self-weight of material in the settled bed • Mechanical raking to release water trapped in the settled bed
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Thickener design configuration s usually consider the high rate or paste thickener options, with a tradeoff between capital cost and process performance. Design s that assume a lower settling flux ...
Read More2020-3-10 Examples of installation points are the feed, underflow, overflow and inside the thickener tank. Flow meters are combined with density meters to calculate the mass flow in the underflow and feed of the thickener. Inside the tank, submerged ultrasonic probes are used for tank profiling, interface detection and measuring the bed level.
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1 - Bed-mass with retractable probe, 2 - Bed-level, 3 - Overflow clarity probe, 4 - Flocculation dosage active control, 5 - Torque load cells, 6 - Density meter, 7 - Flow meter. The extensive experience of Diemme® Filtration with the management of complex filtration and thickening plants results in the enhancement of working time and profit ...
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