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decided to make SAG control one of its priorities in order to further increase throughput and improve stability. The original primary mill control logic delivered by the Optimisation Project in 2005 consisted of a simple PID loop controlling the mill charge (bearing pressure) through feed rate changes.
Sep 10, 2015· The two poster presentations, the first entitled "Calculating SAG mill bearing pressure using thin film hydrodynamics" and the second "SAGmilloptimizationusingmodelpredictivecontrol" emphasise the importance of modelling and advanced control in SAG mills.
Figure 4 Mill Conditions: Too Fast, Too Empty, Full Mill (left to right) After the polar plot is checked to determine if a mill is operating at too high an RPM, the fill levels are monitored. Figure 5 illustrates a trend taken from a SAG mill running under expert system control using bearing pressure .
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over high speed and high bearing pressure, signalling a good mill filling. All process points showing high critical impact rate are shown on the same plot. Most points are situated outside the field of high tonnage conditions. Only at the zone of high speed and medium bearing pressure is Figure 10.
SAG mill feed is at its maximum, mill density is high and bearing pressure remains low; SAG mill feed is at its maximum and mill sound is high; A positive set point change will be applied if all of the following conditions are true: SAG mill feed is not at its maximum; SAG Mill Water Rules
in general, should be designed to accommodate 2535% of the new SAG feed tonnage. HPGR (High pressure grinding rolls) have also been considered to treat pebbles as part of an AG/SAG circuit. Their application, however is only justified if the pebbles generated are a relatively large proportion of AG/SAG mill new feed (Morley, 2006).
bearing. Pressure [bar] Slide shoe bearing Depending on the size of mill, its shell is supported at the periphery by two, four or six slide shoes. The selfaligning support of the slide shoes compensates any slide ring wobbling and eccentricity caused by mill sag, thermal distortion and manufacturing tolerances. Hydrodynamic or hydrostatic ...
Modelling SAG milling power and specific energy consumption including the feed percentage of intermediate size particles ... In these circuits the SAG mill is the largest energy consumer. In many engineering ... rectly measured with bearing pressure measurements, it was decided to discard it as an input variable. The main reason is that
One of our Ball Mills keeps losing pressure on the high pressure pump. It will run fine when starting the Mill and suddenly after a while sometimes 1hrs the pumps will loose pressure. We have just grinded the journal and installed new white metal bearings. After startup this afternoon after about 1h
Model Predictive Control for SAG Milling in Minerals Processing | 5 Model Predictive Control on a SAG Mill and Ball Mills The solution for the SAG Mill is an adaptive controller which controls mill load using direct mill weight measurement or indirectly from bearing oil pressure.
Typically, SAG mill control is performed with respect to bearing pressure and other process variables which are used to estimate volumetric loading in order to optimize the mill throughput. While these methods are typically effective, they can also have several shortcomings when changes in mill liners, lifter profiles (wear), ore density ...
At the Lihir Gold Mine, the plant was utilizing mill''s bearing pressure to calculate load measurement for the SAG mill in HGO1. The use of SAG mill weight for process control is additionally complicated at Lihir by compromised and suddenly drifting load cell and bearing pressure measurements on two of the process plant''s three SAG mills.
• MILL SPEED CONTROL Automatic speed control using the Liner Damage Level signal. • MILL FILL LEVEL CONTROL Use the Mill Feed Rate to control the Mill Fill Level (rather than bearing pressure). The Mill Fill Level setpoint can be pushed to a safe maximum to optimise the throughput.
Using Fuzzy Control to Optimize SAG Mill Production Lynn B. Hales, KnowledgeScape Systems, a Division of EIMCO, Salt Lake City, UTAH ... Controlling the feed rate to a SAG mill is at the ... the mill bearing pressure can also be used to control the mill speed. If the
SAG Mill process control classically maintains the SAG mill volumetric filling within a set operating range. Typically a SAG mill weight measurement, by either bearing pressure transducers or load cells, is used as an inferred measurement of volumetric filling. To maintain volumetric filling within a set operating range the SAG weight setpoint ...
Outotec Grinding technologies 005 Robust design Outotec mills are designed to produce optimal results, even in harsh environments. Outotec offers both trunnion and shell supported mill design, complemented by a drive solution tailored for optimum performance in any environment. Mill bearings The type of support bearing is selected on the basis of
But the FL SAGwise™ system takes this digital audio data and uses techniques such as model predictive control and fuzzy logic rules to assess the mill process parameters." "Within seconds it has analysed the audio frequencies as well as taking on board power usage, mill weight and bearing pressure.
SAG is an acronym for semiautogenous grinding. SAG mills are autogenous mills that also use grinding balls like a ball mill. A SAG mill is usually a primary or first stage grinder. SAG mills use a ball charge of 8 to 21%. The largest SAG mill is 42'' () in diameter, powered by a 28 MW (38,000 HP) motor.
Grinding plant with SAG and tube mill for Gold/copper ore grinding in Australia. This is the world''s biggest SAG mill equipped with sliding shoe bearing arrangement and COMBIFLEX® drive system (a favourablypriced alternative to the ring motors normally used with SAG mills of this size).
How can i control mill load with Trunnion bearing pressure ? We have faulty load cell in our SAG mill. We have previous relation trends when load cell was working fine. We need to develop relationship formula . Please assist me.
The two main variables for controlling the SAG mills are feed and speed. Feed is presently controlled automatically via an expert system that adjusts the amount according to readings taken off of multiple bearing pressure load cells on each mill. Speed control was initially desired to be
discharge bearing pressure in a sag mill Gulin Machines. Gulin: Autogenous mill Semiautogenous mill. Mill weight/ Discharge end bearing oil pressure; discharge bearing pressure in a sag mill customer case. SAG Mill for CopperGold Project Mining Design to Sale SAG MIll is really a until it is small enough to feed the discharge grate grinding.
Every mining operation has a unique grinding process. has experience of over 8,000 grinding mills globally, including manufacturing and delivering the largest SAG/AG mills in the world. Our experts welcome the opportunity to assist you with circuit and circuit control design as well as startup, operation, and optimization of your mill.
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