Model Predictive Control of a Paste Thickener in Coal ,
underflow solids concentration to be within a certain range In coal industry, tailings should be thickened to high solids content to recover water but not too high so as to damage the thickener or underflow pump Important variables in thickener operation include underflow rate, feed solids rate and flocculant dosage to the feed stream
Jan 26, 2015· Thickeners are designed to operate continuously with slurry/water consistently flowing into the centerwell with thickener underflow pumping balanced to maintain a mud bed in the thickener Key to thickener operational efficiency is the solids must be able to settle 2-4 times faster than the nominal water up flow rate
Conventional thickener THK ANDRITZ Delkor (Pty) Ltd utilizes modern engineering technologies Feed solids concentration is the single most important variable affecting the sedimentation properties of a ,
Dynamic Modelling and Analysis of Sedimentation-Consolidation Model in a Paste Thickener Chee Keong Tan 1, , thicken suspension, or underflow product with higher , reached a bottleneck, in which the maximum solids concentration of 30 %  delivered can no longer be satisfactory due to the concerns of increasing scarce water .
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
Thickener And Concentrator - Buy Agitation High Rate ,
Thickener And Concentrator , Find Complete Details about Thickener And Concentrator,Agitation High Rate Thickener,Dewater Thickener For Benficiation Plant,Mining Thickener from Mining Thickener Supplier or Manufacturer-Unionsum International Industrial Co, Ltd
With a safety factor, the maximum feed solids concentration was assigned as 30% for this study Six (6) mathematical models were developed; two for each polymeric condition (one for overflow and one for underflow) A contour plot was produced for each level of the three levels of each of the three variables at each of the three polymeric .
Laboratory Testing for Design of Thickener Circuit
LABORATORY TESTING FOR DESIGN OF THICKENER CIRCUITS Joseph M Keane K D Engineering Co, Inc 1844 W Grant Road, Suite 106 Tucson, Arizona 85745 Introduction Feed dilution or solids-liquid weight The English word "sedimentation" ratio is derived from the Latin verb "sedere" Size and shape of the particulate meaning to sink down
v118n2a3 Optimization of the Rössing countercurrent ,
concentration of 123% (m/m) to the smaller 427 m thickeners, flocculent dosage has little impact on the settling rate and must be increased to 60 g/t of CCD feed to achieve the target clarity of 30 In contrast, a decrease in the feed solids concentration to 5% m/m resulted in an order-of-magnitude increase in the settling rate
Many pump types struggle to meet the demand for pumping the high viscosity and high density mineral concentrate in thickener underflow transfer Bredel hose pumps are designed to handle high-solids content fluids, such as concentrated ore paste with a solids content of 40-80%
On the control of sludge level and underflow concentration ,
THICKENER CONTROL The objectives of a control system in a thickening operation are to stabilize its operation and maximize the underflow concentration, in order to recover the maximum amount of water possible and to minimize the flocculant consumption subject to constraints on the rake torque and on the transport pulp properti
Thickening Resource Book T H I C K E N I N G 222 2 , • Ability to give a denser and more consistent underflow concentration with a single draw off point; , standard feed well for conventional thickeners is designed for a maximum nominal flow velocity of 15 m/min
Chapter 5 Sludge treatment 51 Sludge definition: , (XT)out = concentration of solids in sludge in the thickening zone and in , (note:- the maximum diameter for thickeners is 20m) Use two thickeners:- Area of each thickener = 2 581 = 291 m2 d 291 19m 20m ok
13 Suspended Solids Concentration as a 44 Function of Effective Pressure 14 The Relationship Between the 46 Superficial Velocity and Pressure Gradient 15 Depth of Thickening Zone as a Function 51 of Underflow Concentration and Suspended Solids Loading 16 Maximum Suspended Solids Loading as a 58 Function of Underflow Concentration 17
Theory and Application of Thickener Design A G WATERS ABSTRACT THEORY , and ultimately the maximum steady state underflow concentration that is possible for a given solids throughput In addition, the capital cost ofa thickener will , desliming options on a tailings thickener underflow density and pumping requirements
The higher the density, the less process water is pumped out of the thickener’s underflow The optimisation of water content in the underflow allows for maximum recycling of process water while still keeping the underflow slurry sufficiently liquid to be managed by the underflow pump
Automatic Sludge Blanket Control in an Operating Gravity ,
Because the thickener underflow solids concentration did not change ap- preciably during the test runs, calibration plots covering a wide range of solids concentrations were not obtained A direct calibration was, however, conducted on the thickener 2 underflow solids analyzer following the conclu- sion of test run 5
The optimisation of water content in the underflow allows for maximum recycling of process water while still keeping the underflow slurry sufficiently liquid to be managed by the underflow pump If the thickener’s underflow is destined for a tailings dam, the optimisation of the slurry density helps to reduce negative environmental impacts .
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
CHAPTER 3 SLUDGE THICKENING - Marmara Üniversitesi
concentration (Co) and underflow solids concentration (Cu) This minimum flux is the maximum allowable solids loading for the thickener to work successfully When flux is at minimum, we calculate for the maximum area required If this limit is exceeded, the solids will overflow in the effluent
concentrations, at different flocculant dosage levels, is shown in Figure 1 A maximum settling flux is identified at a suspended solids concentration of between 7 and 8 wt% The thickener feed slurry must be diluted to this concentration to ,
US3731804A - Control of sensity of thickener underflow ,
The low and high pressure sides of a differential pressure meter are communicated by means of water purged conduits to tap points in the side of a thickener The tap points are at different elevations and by means of the meter, the differential pressure of the slurry within the thickener at the tap points is continuously monitored The rate of removal of underflow slurry discharged from the .
Dewatering to higher densities - an industry review
Dewatering to higher densities — an industry review F brunn 22 Paste 2011, Perth, Australia • Sufficient mud retention time Good flocculation is a key to the successful operation of almost any thickener and careful attention needs to be paid to this aspect of the thickener ,
Wa Ultra Hirate thickeners operating in counterflow are capable of producing an underflow with maximum solids concentration These units have a smaller diameter than Hirate thickeners but rely on higher side walls for maximum underflow density Applications Wa uses thickeners to provide solutions for many applications including:
Recycling fine slurry an alternative to paste for coarse ,
pumped co-disposal systems by allowing the rejects to be pumped at the maximum thickener underflow concentration within the requirement to maintain turbulent flow in the pipeline The maximising of the thickener underflow concentration is achieved by recovering and recycling a portion of the minus 2 mm fine tailings
Thickener And Concentrator - Buy Agitation High Rate ,
Thickener And Concentrator , Find Complete Details about Thickener And Concentrator,Agitation High Rate Thickener,Dewater Thickener For Benficiation Plant,Mining Thickener from Mining Thickener Supplier or Manufacturer ,
Maximum underflow density and overflow clarity with bolted construction options to expedite project delivery schedul Thickeners are used in continuous process applications where solid-liquid separation occurs by sedimentation Thickening has three basic purposes: Concentration, or raising the density, of a mixture of solids and liquids; .