sag mill bearing pressure

  • Bearing pressure to mill load control Grinding

    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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  • SAG Mill Control: It Shouldn’t be that Hard E & MJ

    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 mill at MMG’s Century Zinc operation in Australia is shown in the chart (found on pg. 32). In this case, mill speed is the primary manipulated variable used to control mill load. While there is no

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  • SAG Mill Process Control Grinding & Classification

    If the SAG mill is not intended to be the rate-limiting step in a process plant, then it is best to adjust the SAG load (and power) to hold a constant tonnage to satisfy another constraint elsewhere. Underground mines are an example: the hoisting capacity of the mine shaft is the rate-limiting step in the process, and the SAG mill must adapt to what the shaft can supply. So yes, there are

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  • Autogenous mills, semi-autogenous mills and ball mills for

    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 self-aligning support of the slide shoes compensates any slide ring wobbling and eccentricity caused by mill sag, thermal distortion and manufacturing tolerances. Hydrodynamic or hydrostatic lubrication systems can be used for this type of

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  • Evolution of SAG Mill Process Control at the Xstrata

    in 2005 consisted of a simple PID loop controlling the mill charge (bearing pressure) through feed rate changes. Due to the multivariable, non-linear and disturbance dominated nature of the SAG circuit it was quickly found that this traditional PID control strategy was not able to adequately control the mill; resulting in poor stability, frequent operator interventions and less than optimum

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  • SAG Mill Process Control Grinding & Classification

    If the SAG mill is not intended to be the rate-limiting step in a process plant, then it is best to adjust the SAG load (and power) to hold a constant tonnage to satisfy another constraint elsewhere. Underground mines are an example: the hoisting capacity of the mine shaft is the rate-limiting step in the process, and the SAG mill must adapt to what the shaft can supply. So yes, there are

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  • SAG Mill Control: It Shouldnt be that Hard

    SAG Mill Control: It Shouldn’t be While many mills today are mounted on load cells, others employ bearing oil pressure as a proxy measurement of mill load. Schematic illustration of a control strategy recently implemented on a large variable-speed SAG mill at MMG’s Century Zinc operation in Australia. A control strategy recently implemented on a large variable-speed SAG mill at MMG’s

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  • Autogenous mills, semi-autogenous mills and ball mills for

    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 self-aligning support of the slide shoes compensates any slide ring wobbling and eccentricity caused by mill sag, thermal distortion and manufacturing tolerances. Hydrodynamic or hydrostatic lubrication systems can be used for this type of

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  • MillScanner™ WordPress

    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, rotational direction, and/or temperature occur. Using

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  • Improved mill control at Lihir Gold Mine in Papua New

    25/10/2018· 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. This drifting behavior means that an optimized mill-load setpoint that delivered maximum throughput at the start of a shift, is likely not the optimal mill load-setpoint later in

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  • (PDF) Maximising SAG mill throughput at Porgera gold

    Summary of Mill Survey Results 80 survey 1, SAG 2 70 Survey 1 2 2 3 60 Blast # 340-319 320-314 320-314 310-316 SAG 1 Muck Load, vol % 26.3 22.8 26.9 50 Ball Load, vol % 11.0 13.8 13.8 13.2 40 Ball Size, mm 150 125 125 125 30 Power, KW 4550 4650 3970 4310 20 Bearing Pressure, 3900 3740 3720 3927 10 kpa 0 Mill Speed, rpm 11.42 11.42 10.79 11.50 10 100 1,000 10,000 100,000 1,000,000 SAG

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  • Using Fuzzy Control to Optimize SAG Mill Production

    Controlling the feed rate to a SAG mill is at the heart of all grinding optimization systems. Besides trying to maximize the tonnage rate it is necessary that constraining elements also be monitored and used in the determination of optimum federate. For example when the mill weight (bearing pressure) is near its high limit or is increasing rapidly, then the feed should be decreased in order to

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  • What's the Difference Between SAG Mill and Ball Mill

    The main bearing bush is lined with babbitt alloy bush, each bush has two high-pressure oil chambers, high-pressure oil has been supplied to the oil chamber before and during the operation of the mill, the high-pressure oil enters the oil chamber through the shunting motor, and the static pressure oil film is compensated automatically to ensure the same oil film thickness To provide a

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  • OUTOTEC GRINDING TECHNOLOGIES

    Outotec SAG and ball mill Outotec high-performance grinding mills use advanced simulation tools for the best possible process efficiency, mechanical reliability, and maintainability. Our mill range covers comminution applications. 5 High intensity grinding mills The Outotec ® HIGmill is an advanced, energy-efficient fine and ultra-fine grinding solution that relies on proven technology. The

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