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Tailings Thickener Bed Level Control

Pressure transmitters Bed Pressure transmitters are affected by density change and therefore cannot be used for control purposes. Rake Torque from the scraper also work on total load and are affected by density and therefore cannot be used to control bed level. The displacement float sticks and suffers from build-up. ,Thickener 2 - SysCAD Documentation The required total mass of material in the thickener after a Preset. Bed.Volume: Input: Only visible if the preset method is set to Volume. The required volume of material in the bed after a Preset. Volume: Input: Only visible if the preset method is set to Volume. The required total volume of material in the thickener after a Preset. Bed.Level . ,Advanced Thickener Control - Outotec Bed pressure; Overflow turbidity; by adjusting the underflow flow rate and flocculant dosage. Changes in the incoming mass flow taken into account as disturbance variable. Rake torque is also monitored to avoid overload situations. Figure 2. Underflow density turbidity and bed pressure before and after installation of thickener optimizer .

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Although the volume of pulp in the thickener can be allowed to increase or decrease within harmless limits it must be controlled to prevent on the one hand solids from overflowing the thickener and on the other hand the bed pressure from falling so low that the underflow density drops below desired values. Thickener optimization to reduce production costs Endress . 222222 Bed Mass: Reporting the inventory of settled solids inside the thickener is done with a pressure transmitter that senses the rising bed mass. The sensor is fitted in the discharge cone and can control the underflow slurry pump speed to achieve a constant bed mass.

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Underflow mud bed pressure and density measurement; Underflow pumps system management of duty and stand by lines flushing and gland seal water Thickener control options range from basic logic to the most advanced process control Appli ions. Clarifier; High rate thickener with low cone angle Beginners Guide to Thickeners - Outotec
Bed mass is utilized to control thickener inventory. Bed mass is generally measured by a pressure transducers mounted at the bottom of the tank figure 4 . These pressure transducers’ are best lo ed in the cone or close to the center of the thickener.

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Depending on the appli ion conditions different techniques are employed to determine a thickener’s bed level: Theoretical bed level based on the calculation of the average density of a constant height using a hydrostatic pressure sensor. Submerged ultrasound sludge blanket transducer to sense reflections from the solid bed.
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Tailings Thickener Bed Level Control The Sonar Acoustic transmitter can be calibrated to work with two different densities. We can track the Compact Bed Level to control the underflow pump. We can also track a lighter density within the interface column that when affected by a settling problem with in the Thickener will rise hydraulically upwards towards the launders.
Paste Thickeners McLanahan Each McLanahan Paste Thickener includes point level pressure sensors and bed level devices to accurately track sludge level and density. Programmed logic controls run the system and log data such as feed rate pH sludge level and solids concentration.
Instrumentation and Control of Sedimentation Equipment Instrumentation and Control of Sedimentation Equipment Abstract Some of the process variables that are commonly monitored on a thickener are torque rake height bed level bed pressure feed rate and density underflow rate and density settling rate and overflow turbidity. Many of these are easily measured while some can be difficult.

Pressure Bed - Search Pressure Bed Get Pressure Bed. Get Instant Quality Results Now Search Efficiently Search Smarter Find Fast Better Results Developing MudMax for Paste Thickener Bed-Level Measurement The interactions of these parameters are at the heart of thickener models. Knowing the bed depth is critical to maintaining stable thickener operation. Numerous methods have been employed to achieve reliable bed-level measurement including bed pressure ultrasonic capacitance nuclear vibrating probes divers and floats to name just a few .

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