Yes, you add load cells to existing SAG Mills it depends on the type of mill bearing support system. They are normally button type compressive cells. With Polysius mills they are integral in the Feed end bearing pedestals and provide a load signal out via an amplifier and integrator. Check out http//is.gd/GioSt3nbsp.
The best way to measure load is to mount the mill on load cells. The load cells are calibrated to measure the total weight of water, grinding media (balls) and ore in the mill, but not the weight of the mill itself. While many mills today are mounted on load cells, others employ bearing oil pressure as a proxy measurement of mill load. A control strategy recently implemented on a large variable-speed SAG
SAG mill control fundamentally means managing the load in the mill by adjusting the feed rate of ore to the mill and/or manipulating the rotational speed of the mill. The best way to measure load is to mount the mill on load cells. The load cells are calibrated to measure the total weight of water, grinding media (balls) and ore in the mill, but not the weight of the mill itself. While many mills today are mounted on
Nov 01, 2004 Process variables like bearing pressures or load cell measurement can be applied for better correlation. 3. Actual application and resultsThe outlined method was applied in a 36 17 ft 15 000 HP (11.2 MW) variable-speed semiautogenous (SAG) mill for copper ore concentration with nominal throughput of 24 000 tons per day. The mill is of the ring-motor type driven by a cycoconverter.
Figure 4.2 20000lbs range miniature load cell manufactured by Honeywell Sensotec The load cell was of sub miniature kind measuring only 2 inch in diameter and 1 inch in height. This relative small size for a sensor with 20000 lbs range gave the flexibility of attaching it to the lifter inside the mill shell.
Oct 25, 2018 Despite the importance of volumetric mill filling, a measurement is not traditionally provided to the mill operator or metallurgist by instrumentation (Toor, 2015). However, an inferred measurement can be made using a SAG mill weight measurement, using either bearing pressure transducers or load cells.
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.
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8 - 9 August 2011 Perth, WA. Fig. 1- Increase in throughput over liner life for a large SAG mill. Unfortunately however, the 32 ft SAG mill that was studi ed for this project does not feature ...
Each wire has a name, both 4 wire and 6 wire load cells have input, -input, signal and signal wires. A 6 wire load cell will also have a sense and a sense wire which are sometimes referred to as reference and reference. When a load cell is in use, the cables will measure through resistance. The length of the cable will make a difference to the resistance being measured, this is where the 6 wire
SAG Mill Control It Shouldnt be that Hard - womp-int.com. SAG Mill Control It Shouldn ... SAG milling is arguably the most commonly ... The best way to measure load is to mount the mill on load cells.
3.1. A load cell is a device that is used to measure weight or force. When a force is applied to it in a specific manner, a load cell produces an output signal that is proportional to the applied force. ... Mar 09, 2018 To determine if a SAG mill is operating within the generally established guidelines for a large diameter to length ratio SAG ...
Jun 30, 2007 The load cell package was successfully used to produce impact spectra in an 8.5 inch lab scale mill. The mill speed and the ball size were varied to study their effect on the impact spectra. A good correlation was found between the process variables and the impact spectra. The load cell package was then used in a 16 inch pilot scale mill.
An instrumented load cell package that can measure the force of impacts inside the grinding chamber of a mill is developed here. The signal from the instrumented load cell package is interpreted in terms of a histogram termed as an impact spectrum which is a plot of the number of impacts at a specific energy level against the energy.
ONLINE SAG MILL PULSE MEASUREMENT AND OPTIMIZATION SEMI ... Figure 5.8 Load cell package attached to the mill.....47 Figure 5.9 Groove in the lifter.....47 Figure 5.10 Stud cap exposed inside the mill.....48 Figure 5.11 Comparison of Impact spectra with mill speed at 15% mill filling and 1.5 ...
After SAG mill, a trommel screen produces two over and under size materials which the oversize part is circulated into SAG mill and undersize reports to hydrocyclone for further process. Ball filling identify was implemented in this work using mills load sampling and ball abrasion test.
SAG Mill Control It Shouldnt be that Hard - EMJ 14 Apr 2010 ... The best way to measure load is to mount the mill on load cells. The load cells are calibrated to measure the total weight of
The mill load cells supply the charge mass. The load cell signals are compensated for pinion up thrusts 10. The set points for the mill load and the two pulp densities are given by level 3 controls. The points may also be set by neural method of analysis or fuzzy logic expert systems.
Maximum SAG mill po wer was determined by deducting the install ed ball mill pinion power of 7.95kWh/t (16,400kW) from the maximum overall circuit power of
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 use for process control requires regular review ...
The rock load in the mill essentially depends on ore characteristics and the ... circuit with classifiers whose circulating loads reach as high as 400-500%. ... grinding, flow-back can make a significant impact when the mills are operated in ... the load inside the mill increases and the mill draws more power.
Flotation cells and thickener refurbishment. SAG Mill Pinion bearing change and girth gear teeth dressing, Load Cell replacements. CIL tanks inspection,
May 05, 2018 There are few methods of semi-autogenous (SAG) mill power prediction in the full-scale without using long experiments. In this work, the effects of different operating parameters such as feed moisture, mass flowrate, mill load cell mass, SAG mill solid percentage, inlet and outlet water to the SAG mill and work index are studied. A total number of 185 full-scale SAG mill works are utilized to ...
SAG mill. The SAG mill total load is currently held at about 25% volume (14% ball charge and 11% rock charge), but has been as high as 32% has long been debated. One of the objectives of a review carried out by Conveyor Dynamics Incorporated, CDI was to confirm the correlation between SAG mill load and throughput, using the MillStat program. For
Inferential measurement of SAG mill parameters. These points give rise to the following possibilities for improved effectiveness in use of the model a Justification of the installation of a load cell or bearing pressure measurement (in the absence of such a mill weight measurement) Inferential measurement of SAG mill parameters 589 b. Chat Online
The load cell package was successfully used to produce impact spectra in an 8.5 inch lab scale mill. The mill speed and the ball size were varied to study their effect on the impact spectra. A good correlation was found between the process variables and the impact spectra. The load cell package was then used in a 16 inch pilot scale mill.
AG/SAG Milling Pilot Mill dimensions Diameter 1.7m x 0.6m length Typical throughput 0.5 -3.5 t/h depending on ore characteristics and circuit configurations Feed system allowing accurate reconstitution of feed size distribution to the mill Accurate measurement of feed rate, reciculatingload to the mill, charge holdup and mill power
Where HPGR technology has replaced traditional methods of crushing and grinding such as SAG or ball mills, customers have seen energy savings of up to 40%, and substantially improved mineral liberation. Find out more about the Enduron HPGR Enduron High Pressure Grinding Rolls.
installing load cell on trunnion base plate . installing the discharge end trunnion with the trunnion bearing at newmont ahafo line 2 . ... installing the upper section of a sag mill feed end base plate . mixing epoxy grout to be poured at newmont ahafo line 2 . p_20180424_234730 .
Commision I checked equipment and instruments according to plans PI D, testing load cell , pumps, instruments. Tests of the cells with water, pumps, optimal operation of the automatic control. Training Alumbrera - Argentina , 120 000 tpd plant Cu , Mo and Au . With 36-foot SAG mill , Ok Wenco cells and 150 m3 (2.5 months of training ) .
Mill filling is an important operational parameter in a SAG mill circuit and by its control and optimisation it can produce significant improvements in production capacity and energy efficiency. However, it is industry practice to report mill load as the total output given by load cells, or kPa for systems based on lubrication bearing back ...
For friable ore High throughput (lower SAG mill load) Design objective maintain optimum SAG mill load Requires lower operable speed range to maintain load Select liners for life (i.e. high face angle, high lifters) Longer liner life For competent ore low throughput (high SAG mill load)
Mill Operators Conference 2018 29 31 August 5 Optimising SAG Mills Lifters liners protects the shell from wear Charge (mill load) rocks steel media slurry Power draw Controller Microphone, dB indicates direct shell impact Load cell, t Indicator of total mill charge (ball rock slurry) Controller Mill speed, Nc adds ...
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
the use of an ultra fast load cell. Nielsen (1996) has done extensive grinding tests on preconditioned ... Figure 2 compares blast energy to electrical consumption in the SAG mill. The concern at this operation was that excessive blast energy was depleting the source of media rock.